阅读说明：本技术 自适应变光控制液晶笔端和符号显示颜色的摩托车仪表 (Motorcycle instrument capable of adaptively changing light to control liquid crystal pen end and symbol display color ) 是由 黄泽胜 黄胜祥 于 2021-06-29 设计创作，主要内容包括：本发明提出了一种自适应变光控制液晶笔端和符号显示颜色的摩托车仪表,包括由前盖板和后壳组成的壳体,后壳内设有屏幕固定支架,屏幕固定支架为槽型结构,显示屏覆盖在屏幕固定支架的槽口上,围边设有一圈弹片让位缺口,弹片让位缺口内均设有弹片；其中,屏幕固定支架可拆卸安装在后壳内,后壳上设有一圈连接台,屏幕固定支架上对应连接台设有连接支耳,前盖板的背面对应螺栓设有螺纹套,通过螺纹套和螺栓将后壳、屏幕固定支架和前盖板固定在一起,还包括自动变光工作电路,工作电路包括控制模块、光感模块、供电模块,供电模块的电源端与控制模块的电源端和光感模块的电源端相连,控制模块的光感数据采集端与光感模块相连。(The invention provides a motorcycle instrument for controlling a liquid crystal pen end and displaying colors by symbols in a self-adaptive light-changing manner, which comprises a shell consisting of a front cover plate and a rear shell, wherein a screen fixing support is arranged in the rear shell, the screen fixing support is of a groove-shaped structure, a display screen covers a notch of the screen fixing support, a circle of elastic sheet abdicating notches are arranged on the surrounding edge, and elastic sheets are arranged in the elastic sheet abdicating notches; the screen fixing support is detachably mounted in the rear shell, a circle of connecting table is arranged on the rear shell, a connecting lug is arranged on the screen fixing support corresponding to the connecting table, a threaded sleeve is arranged on the back face of the front cover plate corresponding to the bolt, the rear shell, the screen fixing support and the front cover plate are fixed together through the threaded sleeve and the bolt, the screen fixing support further comprises an automatic light-changing working circuit, the working circuit comprises a control module, a light sensing module and a power supply module, the power supply end of the power supply module is connected with the power supply end of the control module and the power supply end of the light sensing module, and the light sensing data acquisition end of the control module is connected with the light sensing module.)

1. The utility model provides a motorcycle instrument of self-adaptation light change control liquid crystal pen end and symbol display colour, includes the casing of constituteing by backshell (3) of front shroud (1) and front side open-ended frame shape structure, and the opening side in backshell (3) is buckled in front shroud (1), display window (101), its characterized in that have been seted up to the display area who corresponds the display screen on front shroud (1): the screen fixing support (2) is arranged in the rear shell (3), the screen fixing support (2) is of a groove-shaped structure with a front opening, the display screen covers a groove opening of the screen fixing support (2), a circle of surrounding edge (203) used for surrounding the display screen is arranged on the outer side of the groove opening of the screen fixing support (2), gum (202) used for adhering the display screen is arranged on the groove opening of the screen fixing support (2), a circle of elastic piece abdicating notch (205) is formed in the surrounding edge (203) around the display screen in an outwards concave mode, elastic pieces (201) used for abutting against the side edges of the display screen are arranged in the elastic piece abdicating notch (205), the elastic pieces (201) and the screen fixing support (2) are integrally formed, and a circle of damping sponge (102) is arranged on the back face of the front cover plate (1) around the display window (101);

wherein, the screen fixing bracket (2) is detachably arranged in the rear shell (3), a circle of connecting table (3c) is arranged on the rear side plate of the rear shell (3) by the side edge thereof, a first through hole is arranged on the connecting table (3c) and used for a bolt (3d) extending into the rear shell (3) from the rear side plate of the rear shell (3) to pass through, a connecting lug (2c) abutting against the connecting table (3c) is arranged on the screen fixing bracket (2) corresponding to the connecting table (3c), a second through hole for the bolt (3d) to pass through is arranged on the connecting lug (2c), a thread sleeve (1a) in threaded connection with the bolt (3d) is arranged on the back surface of the front cover plate (1) corresponding to the bolt (3d), and the rear shell (3), the screen fixing bracket (2) and the front cover plate (1) are fixed together by the thread sleeve (1a) and the bolt (3d), the inner wall of the rear side plate of the rear shell (3) is convexly provided with a clamp (3e), the back surface of the front cover plate (1) is provided with a transverse support lug (1f) extending backwards, a clamping hole for clamping the clamp (3e) is formed in the transverse support lug (1f), and a buckle is formed by the clamp (3e) and the clamping hole;

the automatic light-changing working circuit comprises a control module, a light sensing module and a power supply module, wherein the power supply end of the power supply module is connected with the power supply end of the control module and the power supply end of the light sensing module to respectively provide power for the control module and the light sensing module, and the light sensing data acquisition end of the control module is connected with the light sensing module.

2. A motorcycle instrument according to claim 1, characterized in that: the bottom of the screen fixing support (2) is provided with a plurality of irregular supporting ribs (204) for supporting the display screen.

3. A motorcycle instrument according to claim 1, characterized in that: all be provided with two shell fragment (201) on enclosing edge (203) of four sides of screen fixed bolster (2), two shell fragment (201) that are located the downside all set up along the vertical central line bilateral symmetry of screen fixed bolster (2), and the interval distance of the shell fragment (201) of upside is less than the interval distance between shell fragment (201) of downside.

4. A motorcycle instrument according to claim 1, characterized in that: the power supply module includes: the ignition power IGN is connected with the anode of a diode D2, the cathode of a diode D2 is connected with the cathode of a diode D32, the first end of a resistor R1, the collector of a transistor Q1 and the collector of a transistor Q2, the anode of a diode D32 is connected with a charging power supply RECHARGE, the second end of a resistor R1 is connected with the first end of a capacitor C6, the cathode of a transient diode D3 and the base of a transistor Q2, the second end of a capacitor C6 and the anode of the transient diode D3 are connected with the power ground,

the base electrode of the triode Q1 is connected with the emitter electrode of the triode Q2, the emitter electrode of the triode Q1 is connected with the anode of the electrolytic capacitor EC2, the anode of the electrolytic capacitor EC6, the first end of the capacitor C2, the input end Vin of the low-dropout regulator U1, the first end of the capacitor C173 and the first end of the inductor L1, the second end of the inductor L1 is connected with the first end of the capacitor C174, the emitter electrode of the triode Q1 outputs a power supply + B, the second end of the capacitor C173 and the second end of the capacitor C174 are connected with the power ground, the delayed reset end D of the low-dropout regulator U1 is connected with the first end of the capacitor C4, the output end Vout of the low-dropout regulator U1 is connected with the first end of the capacitor C3, the anode of the electrolytic capacitor EC3 and the first end of the inductor L3, and the second end of the inductor L3 outputs a power supply SY _ 5V; the ground terminal GND of the low dropout regulator U1 is connected with the negative electrode of the electrolytic capacitor EC2, the negative electrode of the electrolytic capacitor EC6, the second end of the capacitor C2, the second end of the capacitor C4, the second end of the capacitor C3 and the negative electrode of the electrolytic capacitor EC3, and the ground terminal GND1 of the low dropout regulator U1 is connected with the power ground.

5. A motorcycle instrument according to claim 4, characterised in that: the power supply module further comprises a voltage reduction module, and the voltage reduction module comprises:

a first end of an inductor L2 is connected with a power supply SY _5V, a second end of an inductor L2 is connected with a first end of a capacitor C11, a first end of a capacitor C13, a first end of a resistor R323 and a power supply input end VIN of a low dropout regulator U18, a second end of a capacitor C11 and a second end of a capacitor C13 are connected with a power supply ground, a ground end GND of the low dropout regulator U18 is connected with the power supply ground, an enable end EN of the low dropout regulator U18 is connected with a second end of the resistor R323, a power supply output end VOUT of a low dropout regulator U18 is connected with a first end of the resistor R10, a first end of a capacitor C17, a first end of the capacitor C167 and an anode of an electrolytic capacitor EC4, and a power supply output end VOUT of a low dropout regulator U18 outputs 3.3V; the feedback terminal FB of the low dropout regulator U18 is connected with the second terminal of the resistor R10, the first terminal of the resistor R324 and the second terminal of the capacitor C17, and the second terminal of the resistor R324, the second terminal of the capacitor C167 and the negative electrode of the electrolytic capacitor EC4 are connected with the power ground.

6. A motorcycle instrument according to claim 4, characterised in that: the power supply module further comprises an ignition voltage detection module, and the ignition voltage detection module comprises:

the ignition power IGN is connected with a first end of a capacitor C112 and a first end of a resistor R286, a second end of the resistor R286 is connected with a first end of a resistor R288, a first end of a capacitor C113 and a first end of a resistor R287, a second end of the resistor R287 is connected with AN ignition voltage detection end P06_7/AN7/TOT1/IN5_ R of the microcontroller U2, and a second end of the capacitor C112, a second end of the resistor R288 and a second end of the capacitor C113 are connected with the power ground.

7. A motorcycle instrument according to claim 4, characterised in that: the power module still includes ignition detection module, and ignition detection module includes:

AN ignition power IGN is connected with a first end of a capacitor C1 and AN anode of a diode D6, a second end of a capacitor C1 is connected with a power ground, a cathode of a diode D6 is connected with a first end of a capacitor C170 and a first end of a magnetic bead FB6, a second end of a magnetic bead FB6 is connected with a first end of a capacitor C171 and a first end of a resistor R338, a second end of the resistor R338 is connected with a first end of a resistor R17 and a first end of a resistor R16, a second end of a resistor R16 is connected with a base of a triode Q36, a collector of the triode Q36 is connected with a first end of a resistor R339 and a first end of a resistor R340, a second end of the resistor R339 is connected with a power SY _5V, a second end of the resistor R340 is connected with a first end of a capacitor C169 and a first end of a resistor R341, a second end of the resistor R341 is connected with AN ignition detection end P10_0/PWM1P4/SIN2/TIN 3/AN 2838 of a capacitor U2, and a second end of the capacitor C39169 is connected with a second end of a resistor R338, The second terminal of the capacitor C170, the second terminal of the capacitor C171, the second terminal of the resistor R17, and the emitter of the transistor Q36 are connected to the power ground.

8. A motorcycle instrument according to claim 1, characterized in that: the light sense module includes:

a power supply terminal VDD of the ambient light sensor U17 is connected to a first terminal of a capacitor C86 and a power supply 3.3V, a second terminal of a capacitor C86 is connected to a power ground, an address terminal ADDR of the ambient light sensor U17 and a ground terminal GND of the ambient light sensor U17 are connected to the power ground, a data terminal SDA of the ambient light sensor U17 is connected to a data low voltage terminal SDA1 of a voltage level converter U14 and a first terminal of a resistor R204, a clock terminal SCL of the ambient light sensor U17 is connected to a clock low voltage terminal SCL1 of a voltage level converter U14 and a first terminal of a resistor R205, a low voltage side reference power supply terminal VREF1 of the voltage level converter U14, a second terminal of the resistor R204, a second terminal of the resistor R205, and a first terminal of a capacitor C114 are connected to the power supply 3.3V,

a data high-voltage end SDA2 of a voltage level converter U14 is connected with a first end of a resistor R203, a data end P02_5/SEG33/OUT0_ R/INT13/SIN5_ R of a microcontroller U2, a clock high-voltage end SCL2 of the voltage level converter U14 is connected with a first end of the resistor R202 and a clock end P03_0/V0/SEG36/PPG4_ B of the microcontroller U2, a high-voltage side reference power supply electric end VREF2 of the voltage level converter U14 is connected with a switch enabling input end EN of the voltage level converter U14, a first end of the resistor R201 and a first end of a capacitor C154, a second end of the resistor R201 and a second end of the resistor R202 and a second end of the resistor R203 are connected with a power supply SY _5V, a ground end of the voltage level converter U14, a first end of the capacitor C114 and a second end of the capacitor C154 are connected with a power ground;

the control module includes: a ground terminal VSS1 of the microcontroller U2 is connected with a power ground, an internal stabilized voltage supply stabilizing capacitor terminal C of the microcontroller U2 is connected with a first terminal of a capacitor C41, a second terminal of the capacitor C41 is connected with the power ground, an analog circuit power supply terminal AVCC of the microcontroller U2 is connected with a first terminal of a capacitor C48 and a power supply MCU _5V, an A/D converter high reference voltage input terminal AVRH of the microcontroller U2 is connected with a first terminal of a capacitor C49 and a power supply MCU _5V, a second terminal of a capacitor C48, a second terminal of a capacitor C49 and a first terminal of a capacitor C51 are connected with the power ground, an A/D converter high reference voltage input terminal AVRL of the microcontroller U2 and an analog circuit ground terminal AVSS are connected with the power ground, and a power supply terminal VCC1 of the microcontroller U2 is connected with a second terminal of the capacitor C51 and the power supply MCU _ 5V; a ground terminal VSS5 of the microcontroller U2 is connected with a power ground, an SMC power supply terminal DVCC1 of the microcontroller U2 is connected with a first terminal of a capacitor C54 and a power supply MCU _5V, and an SMC ground terminal DVSS1 of the microcontroller U2 and a second terminal of a capacitor C54 are connected with the power ground;

an SMC power supply terminal DVCC2 of the microcontroller U2 is connected with a first terminal of a capacitor C55 and a power supply MCU _5V, and an SMC ground terminal DVSS2 and a second terminal of a capacitor C55 of the microcontroller U2 are connected with a power supply ground; a power supply terminal VCC3 of the microcontroller U2 is connected with a first end of the capacitor C56 and the power supply MCU _ 5V; a second terminal of the capacitor C56 is connected to power ground;

the ground terminal VSS2 of the microcontroller U2 is connected with the power ground, the on-chip debug terminal DEBUGI/F of the microcontroller U2 is connected with the first terminal of the resistor R42 and the first terminal of the resistor R43, the second terminal of the resistor R42 is connected with the first terminal of the key S11, the second terminal of the key S11 is connected with the power ground, the second terminal of the resistor R43 is connected with the power MCU _5V,

an operation mode selection end MD of the microcontroller U2 is connected with a first end of a resistor R41, a reset end RSTX of the microcontroller U2 is connected with a first end of a capacitor C46, a first end of a capacitor C47 and a first end of a resistor R40, a second end of a resistor R40 is connected with a power supply MCU _5V, and a second end of a capacitor C46, a second end of a capacitor C47 and a second end of a resistor R41 are connected with the power supply ground;

a crystal oscillator input end X0 of the microcontroller U2 is connected with a first end of a crystal oscillator Y1 and a first end of a capacitor C45, a crystal oscillator output end X1 of the microcontroller U2 is connected with a second end of a crystal oscillator Y1 and a first end of a capacitor C44, and a second end of the capacitor C44 and a second end of a capacitor C45 are connected with a power ground;

ground terminal VSS3 of microcontroller U2 is connected with power ground, power supply terminal VCC2 of microcontroller U2 is connected with the first end of capacitor C43, power MCU _5V, the second end of capacitor C43 is connected with power ground, ground terminal VSS4 of microcontroller U2 is connected with power ground, power supply terminal VCC of microcontroller U2 is connected with the first end of capacitor C42 and power MCU _5V, the second end of capacitor C42 is connected with power ground.

9. A motorcycle instrument according to claim 1, characterized in that: the back of the screen fixing support (2) is provided with a plurality of second positioning holes (2a), and the inner side of the rear side plate of the rear shell (3) is provided with second positioning columns (3a) inserted into the second positioning holes (2 a).

10. A motorcycle instrument according to claim 9, characterized in that: the left and right sides outer wall of screen fixed bolster (2) all is equipped with first locating column (2e) that extend backward, the rear end of first locating column (2e) extends to the rear side of screen fixed bolster (2), be equipped with on backshell (3) the posterior lateral plate and supply first locating column (2e) male first locating hole (3 e).

Technical Field

The invention relates to the technical field of motorcycle accessories, in particular to a motorcycle instrument capable of adaptively controlling the display colors of a liquid crystal pen tip and symbols by changing light.

Background

All motor vehicles are provided with instrument boxes in the direction of the head of the motorcycle, and the instrument boxes are used as important devices for monitoring the working conditions of all systems of the motorcycle and can monitor oil consumption, the current speed, mileage display and the like; the driver can master the working state of each part of the motorcycle at any time through the motorcycle instrument. The instrument box is therefore one of the necessary accessories for all motor vehicles.

Common motorcycle instrument all adopts the shell and the screen fixed bolster integral type setting in the shell, but because the shell of motorcycle instrument exposes outside, easily receive the wind and shine and take place deformation, also receive the striking easily simultaneously. Therefore shell and the screen fixed bolster that the integral type set up, when the shell takes place deformation or striking, the screen fixed bolster can be given in most of the stress that its produced, and the screen fixed bolster is direct fixed with the display screen, and the stress that receives on the screen fixed bolster probably can be given for the display screen, consequently, the display screen very easily receives the damage. The fixing method of the display screen is clamping fixing, deformation is easily formed at the clamping pressing position, and particularly, the bottom color of the motor vehicle instrument display screen is mostly black, and liquid leakage or white spots are easily generated.

In addition, in the driving process of the motorcycle, light is unstable, and the light cannot be measured accurately, so that the reading of a motorcycle instrument by a driver is influenced, the attention of the driver is seriously influenced, and the risk of safety accidents is increased.

Disclosure of Invention

The invention aims to at least solve the technical problems in the prior art, and particularly creatively provides a motorcycle instrument with a self-adaptive light-changing control liquid crystal pen end and a symbol display color.

In order to achieve the above purpose, the invention provides a motorcycle instrument for self-adaptive light-changing control of a liquid crystal pen end and color display of symbols, which comprises a shell consisting of a front cover plate and a rear shell with a frame-shaped structure and an opening at the front side, wherein the front cover plate is buckled at the opening side of the rear shell, a display window is arranged on the front cover plate corresponding to a display area of a display screen, a screen fixing support is arranged in the rear shell, the screen fixing support is of a groove-shaped structure with an opening at the front side, the display screen covers a groove opening of the screen fixing support, a circle of surrounding edge for surrounding the display screen is arranged on the outer side of the groove opening, a back glue for adhering the display screen is arranged on the groove opening of the screen fixing support, a circle of abdicating gap is arranged around the display screen in an outward concave manner, elastic sheets for propping against the side edges of the display screen are arranged in the abdicating gaps of the elastic sheets, and the elastic sheets and the screen fixing support are integrally formed, a circle of damping sponge is arranged on the back surface of the front cover plate around the display window;

the screen fixing support is detachably mounted in the rear shell, a circle of connecting table is arranged on the rear side plate of the rear shell by the side edge of the rear side plate, a first through hole is formed in the connecting table and used for allowing a bolt extending into the rear shell from the rear shell rear side plate to pass through, a connecting support lug which abuts against the connecting table is arranged on the screen fixing support and corresponds to the connecting table, a second through hole for allowing the bolt to pass through is formed in the connecting support lug, a threaded sleeve which is in threaded connection with the bolt is arranged on the back surface of the front cover plate and corresponds to the bolt, the rear shell, the screen fixing support and the front cover plate are fixed together through the threaded sleeve and the bolt, a clamp is arranged on the inner wall of the rear side plate of the rear shell in a protruding mode, a transverse support lug which extends backwards is arranged on the back surface of the front cover plate, a clamping hole for clamping the clamp is formed in the transverse support lug, and a buckle is formed in the clamping hole;

the automatic light-changing working circuit comprises a control module, a light sensing module and a power supply module, wherein the power supply end of the power supply module is connected with the power supply end of the control module and the power supply end of the light sensing module to respectively provide power for the control module and the light sensing module, and the light sensing data acquisition end of the control module is connected with the light sensing module.

In the scheme, the method comprises the following steps: the bottom of the screen fixing support is provided with a plurality of irregular supporting ribs for supporting the display screen. Form the fretwork form through the support rib, the heat dissipation of being convenient for avoids because the display screen shows that the high temperature takes place the condition that the gum comes unstuck or screen fixed bolster warp.

In the scheme, the method comprises the following steps: all be provided with two shell fragments on the surrounding edge of four sides of screen fixed bolster, two shell fragments that are located the downside all set up along the vertical central line bilateral symmetry of screen fixed bolster, and the spacing distance of the shell fragment of upside is less than the spacing distance between the shell fragment of downside. The elastic sheets on the upper side and the lower side are arranged in a left-right staggered mode, so that the clamping points on the upper side and the lower side are prevented from being located on the same straight line, the clamping points are dispersed, and the clamping stability is improved. Meanwhile, the display screen is normally arranged to be a transverse screen, the upper width and the lower width are smaller than the left width and the right width, the situation that the display screen is deformed due to the fact that the upper clamping force and the lower clamping force are overlapped can be avoided, and conventional requirements are met.

In the scheme, the method comprises the following steps: the power supply module includes:

the ignition power IGN is connected with the anode of a diode D2, the cathode of a diode D2 is connected with the cathode of a diode D32, the first end of a resistor R1, the collector of a transistor Q1 and the collector of a transistor Q2, the anode of a diode D32 is connected with a charging power supply RECHARGE, the second end of a resistor R1 is connected with the first end of a capacitor C6, the cathode of a transient diode D3 and the base of a transistor Q2, the second end of a capacitor C6 and the anode of the transient diode D3 are connected with the power ground,

the base electrode of the triode Q1 is connected with the emitter electrode of the triode Q2, the emitter electrode of the triode Q1 is connected with the anode of the electrolytic capacitor EC2, the anode of the electrolytic capacitor EC6, the first end of the capacitor C2, the input end Vin of the low-dropout regulator U1, the first end of the capacitor C173 and the first end of the inductor L1, the second end of the inductor L1 is connected with the first end of the capacitor C174, the emitter electrode of the triode Q1 outputs a power supply + B, the second end of the capacitor C173 and the second end of the capacitor C174 are connected with the power ground, the delayed reset end D of the low-dropout regulator U1 is connected with the first end of the capacitor C4, the output end Vout of the low-dropout regulator U1 is connected with the first end of the capacitor C3, the anode of the electrolytic capacitor EC3 and the first end of the inductor L3, and the second end of the inductor L3 outputs a power supply SY _ 5V; the ground terminal GND of the low dropout regulator U1 is connected with the negative electrode of the electrolytic capacitor EC2, the negative electrode of the electrolytic capacitor EC6, the second end of the capacitor C2, the second end of the capacitor C4, the second end of the capacitor C3 and the negative electrode of the electrolytic capacitor EC3, and the ground terminal GND1 of the low dropout regulator U1 is connected with the power ground.

In the scheme, the method comprises the following steps: the power supply module further comprises a voltage reduction module, and the voltage reduction module comprises:

a first end of an inductor L2 is connected with a power supply SY _5V, a second end of an inductor L2 is connected with a first end of a capacitor C11, a first end of a capacitor C13, a first end of a resistor R323 and a power supply input end VIN of a low dropout regulator U18, a second end of a capacitor C11 and a second end of a capacitor C13 are connected with a power supply ground, a ground end GND of the low dropout regulator U18 is connected with the power supply ground, an enable end EN of the low dropout regulator U18 is connected with a second end of the resistor R323, a power supply output end VOUT of a low dropout regulator U18 is connected with a first end of the resistor R10, a first end of a capacitor C17, a first end of the capacitor C167 and an anode of an electrolytic capacitor EC4, and a power supply output end VOUT of a low dropout regulator U18 outputs 3.3V; the feedback terminal FB of the low dropout regulator U18 is connected with the second terminal of the resistor R10, the first terminal of the resistor R324 and the second terminal of the capacitor C17, and the second terminal of the resistor R324, the second terminal of the capacitor C167 and the negative electrode of the electrolytic capacitor EC4 are connected with the power ground.

In the scheme, the method comprises the following steps: the power supply module further comprises an ignition voltage detection module, and the ignition voltage detection module comprises:

the ignition power IGN is connected with a first end of a capacitor C112 and a first end of a resistor R286, a second end of the resistor R286 is connected with a first end of a resistor R288, a first end of a capacitor C113 and a first end of a resistor R287, a second end of the resistor R287 is connected with AN ignition voltage detection end P06_7/AN7/TOT1/IN5_ R of the microcontroller U2, and a second end of the capacitor C112, a second end of the resistor R288 and a second end of the capacitor C113 are connected with the power ground.

In the scheme, the method comprises the following steps: the power module still includes ignition detection module, and ignition detection module includes:

AN ignition power IGN is connected with a first end of a capacitor C1 and AN anode of a diode D6, a second end of a capacitor C1 is connected with a power ground, a cathode of a diode D6 is connected with a first end of a capacitor C170 and a first end of a magnetic bead FB6, a second end of a magnetic bead FB6 is connected with a first end of a capacitor C171 and a first end of a resistor R338, a second end of the resistor R338 is connected with a first end of a resistor R17 and a first end of a resistor R16, a second end of a resistor R16 is connected with a base of a triode Q36, a collector of the triode Q36 is connected with a first end of a resistor R339 and a first end of a resistor R340, a second end of the resistor R339 is connected with a power SY _5V, a second end of the resistor R340 is connected with a first end of a capacitor C169 and a first end of a resistor R341, a second end of the resistor R341 is connected with AN ignition detection end P10_0/PWM1P4/SIN2/TIN 3/AN 2838 of a capacitor U2, and a second end of the capacitor C39169 is connected with a second end of a resistor R338, The second terminal of the capacitor C170, the second terminal of the capacitor C171, the second terminal of the resistor R17, and the emitter of the transistor Q36 are connected to the power ground.

In the scheme, the method comprises the following steps: the light sense module includes:

a power supply terminal VDD of the ambient light sensor U17 is connected to a first terminal of a capacitor C86 and a power supply 3.3V, a second terminal of a capacitor C86 is connected to a power ground, an address terminal ADDR of the ambient light sensor U17 and a ground terminal GND of the ambient light sensor U17 are connected to the power ground, a data terminal SDA of the ambient light sensor U17 is connected to a data low voltage terminal SDA1 of a voltage level converter U14 and a first terminal of a resistor R204, a clock terminal SCL of the ambient light sensor U17 is connected to a clock low voltage terminal SCL1 of a voltage level converter U14 and a first terminal of a resistor R205, a low voltage side reference power supply terminal VREF1 of the voltage level converter U14, a second terminal of the resistor R204, a second terminal of the resistor R205, and a first terminal of a capacitor C114 are connected to the power supply 3.3V,

a data high-voltage end SDA2 of a voltage level converter U14 is connected with a first end of a resistor R203, a data end P02_5/SEG33/OUT0_ R/INT13/SIN5_ R of a microcontroller U2, a clock high-voltage end SCL2 of the voltage level converter U14 is connected with a first end of the resistor R202 and a clock end P03_0/V0/SEG36/PPG4_ B of the microcontroller U2, a high-voltage side reference power supply electric end VREF2 of the voltage level converter U14 is connected with a switch enabling input end EN of the voltage level converter U14, a first end of the resistor R201 and a first end of a capacitor C154, a second end of the resistor R201 and a second end of the resistor R202 and a second end of the resistor R203 are connected with a power supply SY _5V, a ground end of the voltage level converter U14, a first end of the capacitor C114 and a second end of the capacitor C154 are connected with a power ground;

the control module includes: a ground terminal VSS1 of the microcontroller U2 is connected with a power ground, an internal stabilized voltage supply stabilizing capacitor terminal C of the microcontroller U2 is connected with a first terminal of a capacitor C41, a second terminal of the capacitor C41 is connected with the power ground, an analog circuit power supply terminal AVCC of the microcontroller U2 is connected with a first terminal of a capacitor C48 and a power supply MCU _5V, an A/D converter high reference voltage input terminal AVRH of the microcontroller U2 is connected with a first terminal of a capacitor C49 and a power supply MCU _5V, a second terminal of a capacitor C48, a second terminal of a capacitor C49 and a first terminal of a capacitor C51 are connected with the power ground, an A/D converter high reference voltage input terminal AVRL of the microcontroller U2 and an analog circuit ground terminal AVSS are connected with the power ground, and a power supply terminal VCC1 of the microcontroller U2 is connected with a second terminal of the capacitor C51 and the power supply MCU _ 5V; a ground terminal VSS5 of the microcontroller U2 is connected with a power ground, an SMC power supply terminal DVCC1 of the microcontroller U2 is connected with a first terminal of a capacitor C54 and a power supply MCU _5V, and an SMC ground terminal DVSS1 of the microcontroller U2 and a second terminal of a capacitor C54 are connected with the power ground;

an SMC power supply terminal DVCC2 of the microcontroller U2 is connected with a first terminal of a capacitor C55 and a power supply MCU _5V, and an SMC ground terminal DVSS2 and a second terminal of a capacitor C55 of the microcontroller U2 are connected with a power supply ground; a power supply terminal VCC3 of the microcontroller U2 is connected with a first end of the capacitor C56 and the power supply MCU _ 5V; a second terminal of the capacitor C56 is connected to power ground;

the ground terminal VSS2 of the microcontroller U2 is connected with the power ground, the on-chip debug terminal DEBUGI/F of the microcontroller U2 is connected with the first terminal of the resistor R42 and the first terminal of the resistor R43, the second terminal of the resistor R42 is connected with the first terminal of the key S11, the second terminal of the key S11 is connected with the power ground, the second terminal of the resistor R43 is connected with the power MCU _5V,

an operation mode selection end MD of the microcontroller U2 is connected with a first end of a resistor R41, a reset end RSTX of the microcontroller U2 is connected with a first end of a capacitor C46, a first end of a capacitor C47 and a first end of a resistor R40, a second end of a resistor R40 is connected with a power supply MCU _5V, and a second end of a capacitor C46, a second end of a capacitor C47 and a second end of a resistor R41 are connected with the power supply ground;

a crystal oscillator input end X0 of the microcontroller U2 is connected with a first end of a crystal oscillator Y1 and a first end of a capacitor C45, a crystal oscillator output end X1 of the microcontroller U2 is connected with a second end of a crystal oscillator Y1 and a first end of a capacitor C44, and a second end of the capacitor C44 and a second end of a capacitor C45 are connected with a power ground;

ground terminal VSS3 of microcontroller U2 is connected with power ground, power supply terminal VCC2 of microcontroller U2 is connected with the first end of capacitor C43, power MCU _5V, the second end of capacitor C43 is connected with power ground, ground terminal VSS4 of microcontroller U2 is connected with power ground, power supply terminal VCC of microcontroller U2 is connected with the first end of capacitor C42 and power MCU _5V, the second end of capacitor C42 is connected with power ground.

In the scheme, the method comprises the following steps: the back of the fixed support is provided with a plurality of second positioning holes, and the inner side of the rear side plate of the rear shell is provided with second positioning columns inserted into the second positioning holes. The positioning is carried out through the positioning columns and the positioning holes, and the fixed support is prevented from moving left and right.

In the scheme, the method comprises the following steps: the left and right sides outer wall of fixed bolster all is equipped with the first locating post that extends backward, the rear end of first locating post extends to the rear side of fixed bolster, be equipped with on the backshell posterior lateral plate and supply first locating hole of first locating post male. Can advance the location through first reference column and first locating hole, improve location efficiency, the second locating hole of being convenient for and the second reference column are fixed a position.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the screen fixed bolster and front shroud, backshell are the equal separation setting, prevent that deformation from causing the LCD unusual. When front shroud or backshell received deformation, the hardness of being connected between both and the screen fixed bolster is not so strong, and the extrusion force that produces during deformation transmits the part that transmits the screen fixed bolster and can reduce to can weaken the deformation strength of screen fixed bolster, protect the display screen as far as possible not influenced by backshell and front shroud and damage.

2. The gum that sets up can effectively fix the back of display screen, and the shell fragment of setting can retrain all around the display screen to in can not touching the display area of display screen, can not produce the condition of deformation, extrusion liquid level or weeping.

3. The shock attenuation sponge that sets up can prevent effectively that the front shroud from to the extrusion of display screen, further avoids producing the condition that extrudees the liquid level, produce deformation in the front of display screen.

4. The automatic dimming working circuit can ensure that the display brightness of the motorcycle instrument is rapidly adjusted to proper brightness along with the change of light, so that a driver can easily read the instrument data.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is an exploded view of the front cover plate, screen mount bracket and rear housing of the present invention;

FIG. 2 is a front view of the screen holding bracket and rear housing of the present invention;

FIG. 3 is a perspective view of the screen holding bracket of the present invention;

FIG. 4 is a rear view of the fixing bracket;

FIG. 5 is a front view of the front cover plate;

FIG. 6 is a rear view of the front cover plate;

FIG. 7 is a perspective view of the front cover plate;

FIG. 8 is a front view of the rear housing;

FIG. 9 is a system framework diagram of the present invention;

FIG. 10 is a schematic circuit diagram of the power module of the present invention;

FIG. 11 is a circuit schematic of the buck module of the present invention;

FIG. 12 is a schematic diagram of an ambient light sensor circuit of the light sensing module of the present invention;

FIG. 13 is a schematic diagram of a voltage level shifter circuit of the photo sensor module according to the present invention;

FIG. 14 is a circuit schematic of the control module of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As shown in fig. 1 to 14, a display screen fixing device for a motorcycle meter comprises a housing composed of a front cover plate 1 and a rear case 3 of a frame structure with a front opening, wherein the front cover plate 1 is fastened on the opening side of the rear case 3. The front cover plate 1 is provided with a display window 101 corresponding to a display area of the display screen for exposing the display area of the display screen. Be equipped with screen fixed bolster 2 in the backshell 3, screen fixed bolster 2 is the open-ended cell type structure in front, and the display screen covers on the notch of screen fixed bolster 2. The outside of its notch is provided with the surrounding edge 203 that the round is used for surrounding the display screen, has the gum 202 that is used for pasting the display screen on the notch of screen fixed bolster 2, through the back of gum 202 fixed display screen, can also the shock attenuation simultaneously, reduces the abnormal sound. Preferably, the back adhesive 202 is disposed adjacent to the outer edge of the back surface of the display screen, so as to reduce gaps between the outer edge of the back surface of the display screen, prevent the outer edge of the back surface of the display screen from tilting, and improve the connection stability of the outer edge of the back surface of the display screen as much as possible. Preferably, the thickness of the back adhesive 202 is 0.6mm, which can further reduce the shock and noise as much as possible. Surrounding edge 203 is equipped with round shell fragment around the display screen is outside sunken and steps down breach 205, and the shell fragment all is equipped with the shell fragment 201 that is used for supporting the display screen side in stepping down breach 205, and the shell fragment 201 that sets up is used for the side of fixed display screen, cliies the plate body of display screen through shell fragment 201, can not push down the liquid crystal of display screen, prevents to produce the white point on the display screen. Specifically, shell fragment 201 and screen fixed bolster 2 integrated into one piece, the front end of shell fragment 201 is free unsettled, and the rear end of shell fragment 201 is fixed on screen fixed bolster 2. A ring of shock absorbing sponge 102 is provided around the display window 101 on the back of the front cover 1. The shock attenuation sponge that sets up is used for supporting the display screen openly, avoids the display screen openly and the front shroud striking, protects the display screen, can also reduce the abnormal sound simultaneously.

Preferably, the bottom of the screen fixing bracket 2 is provided with a plurality of irregular supporting ribs 204 for supporting the display screen. Form the fretwork form through the support rib, the heat dissipation of being convenient for avoids taking place the condition that gum 202 comes unstuck or screen fixed bolster 2 warp because display screen shows that the temperature is too high. Specifically, the bottom of the pit without the back adhesive 202 may be provided with a plurality of irregular support ribs 204 to form a hollow shape.

Preferably, the left and right support ribs 204 are symmetrically disposed along the vertical center line of the recess 203. The supporting force is symmetrical, the supporting stability is improved, and the inclination is not easy to occur.

Two elastic sheets 201 are arranged on the surrounding edges 203 of the four sides of the screen fixing support 2. The two elastic sheets 201 on the upper side and the lower side are arranged along the vertical center line of the screen fixing support 2 in a bilateral symmetry manner, and preferably, the spacing distance of the elastic sheets 201 on the upper side is smaller than that between the elastic sheets 201 on the lower side. That is, the elastic pieces 201 on the upper and lower sides are arranged in a staggered manner, so that the clamping points on the upper and lower sides are prevented from being located on the same straight line, the clamping points are dispersed, and the clamping stability is improved. Meanwhile, the display screen is normally arranged to be a transverse screen, the upper width and the lower width are smaller than the left width and the right width, the situation that the display screen is deformed due to the fact that the upper clamping force and the lower clamping force are overlapped can be avoided, and the service life of the display screen is prolonged. The two elastic sheets 201 positioned on the left side and the right side are arranged along the transverse center line of the screen fixing support 2 in a bilateral symmetry mode.

Preferably, the screen fixing bracket 2 is detachably attached to the rear case 3. Specifically, the bottom of the inner side of the rear shell 3 is provided with a circle of connecting table 3c, the connecting table 3c is provided with a first through hole, and the first through hole is used for allowing a bolt 3d extending into the rear shell from the rear side of the rear shell 3 to penetrate through. A connecting support lug 2c which is abutted against the connecting platform 3c is arranged on the screen fixing support 2 corresponding to the support column 3c, and a second through hole for the bolt 3d to pass through is arranged on the connecting support lug 2 c. The back of the front cover plate 1 is provided with a thread bush 1a corresponding to the bolt 3d and in threaded connection with the bolt 3d, and the rear shell 3, the screen fixing bracket 2 and the front cover plate 1 are fixed together through the thread bush 1a and the bolt 3 d. The inner wall of the upper side of the rear shell 3 is convexly provided with a clip 3e, and the back surface of the front cover plate 1 is provided with a transverse lug 1f extending backwards. The transverse support lug 1f is provided with a clamping hole for clamping the clamp 3e, and a buckle is formed by the clamp 3e and the clamping hole. The screen fixed bolster and front shroud, backshell are the equal separation setting, prevent that deformation from causing the LCD unusual. When front shroud or backshell received deformation, the hardness of being connected between both and the screen fixed bolster is not so strong, and the extrusion force that produces during deformation transmits the part that transmits the screen fixed bolster and can reduce to can weaken the deformation strength of screen fixed bolster, protect the display screen as far as possible not influenced by backshell and front shroud and damage.

Preferably, the back of the screen fixing bracket 2 is provided with a plurality of second positioning holes 2a, and the bottom of the inner side of the rear housing 3 is provided with second positioning posts 3a inserted into the second positioning holes 2 a. Fix a position through reference column and locating hole, avoid screen fixed bolster 2 to remove about.

Preferably, the left and right sides of the screen fixing bracket 2 are provided with first positioning posts 2e extending backwards, the rear ends of the first positioning posts 2e extend to the rear side of the screen fixing bracket 2, and the bottom of the inner side of the rear shell 3 is provided with first positioning holes 3e for the first positioning posts 2e to insert. Can advance the location through first locating column 2e and first locating hole 3e, improve location efficiency, be convenient for second locating hole 3a and second reference column 3a fix a position.

Preferably, the window 1a is provided with glass, two keys 1b arranged at left and right intervals are arranged below the window 1a, an induction button located right behind the keys 1b is arranged in the rear shell 3, a pressing column 3b is arranged between the induction button and the keys 1b, and a third through hole 2b for the pressing column 3b to pass through is arranged on the screen fixing support 2.

Preferably, the two keys 1b are oppositely arranged along the vertical center line of the front cover plate 1. And the two keys 1b are right trapezoid, and two sides of the two keys 1b far away from each other are oblique sides.

Preferably, the key 1b has an elliptical protrusion 1e on the back surface thereof, and the front end of the push rod 3b abuts against the protrusion 1 e. Set up to the arch of ellipse circular, can prevent deformation, improve service life.

Wherein, be equipped with on the screen fixed bolster 2 and distribute two of being located the display screen left and right sides and be listed as pilot lamp mounting groove 2d, also be equipped with on the front shroud 1 with pilot lamp mounting groove 2d around the coincident first through-hole 1d, right side pilot lamp mounting groove 2 d's upside is equipped with photosensitive element mounting groove 206, photosensitive element installs photosensitive element by the tank bottom in the photosensitive element mounting groove 206, be equipped with the leaded light post by the notch in the photosensitive element mounting groove 206, wherein, the material of leaded light post is made for ya keli, refracts external light into photosensitive element mounting groove 206 tank bottom through the leaded light post. The front cover plate 1 is also provided with a photosensitive through hole 1f which is overlapped with the photosensitive element mounting groove 206 in the front-back direction.

The automatic light-changing working circuit comprises a control module, a light sensing module and a power supply module, wherein the power supply end of the power supply module is connected with the power supply end of the control module and the power supply end of the light sensing module to respectively provide power for the control module and the light sensing module, and the light sensing data acquisition end of the control module is connected with the light sensing module, as shown in figure 1.

As shown in fig. 2, the power supply module includes:

the ignition power IGN is connected with the anode of a diode D2, the cathode of a diode D2 is connected with the cathode of a diode D32, the first end of a resistor R1, the collector of a transistor Q1 and the collector of a transistor Q2, the anode of a diode D32 is connected with a charging power supply RECHARGE, the second end of a resistor R1 is connected with the first end of a capacitor C6, the cathode of a transient diode D3 and the base of a transistor Q2, the second end of a capacitor C6 and the anode of the transient diode D3 are connected with the power ground,

the base electrode of the triode Q1 is connected with the emitter electrode of the triode Q2, the emitter electrode of the triode Q1 is connected with the anode of the electrolytic capacitor EC2, the anode of the electrolytic capacitor EC6, the first end of the capacitor C2, the input end Vin of the low-dropout regulator U1, the first end of the capacitor C173 and the first end of the inductor L1, the second end of the inductor L1 is connected with the first end of the capacitor C174, the emitter electrode of the triode Q1 outputs a power supply + B, the second end of the capacitor C173 and the second end of the capacitor C174 are connected with the power ground, the delayed reset end D of the low-dropout regulator U1 is connected with the first end of the capacitor C4, the output end Vout of the low-dropout regulator U1 is connected with the first end of the capacitor C3, the anode of the electrolytic capacitor EC3 and the first end of the inductor L3, and the second end of the inductor L3 outputs a power supply SY _ 5V; the ground terminal GND of the low dropout regulator U1 is connected with the negative electrode of the electrolytic capacitor EC2, the negative electrode of the electrolytic capacitor EC6, the second end of the capacitor C2, the second end of the capacitor C4, the second end of the capacitor C3 and the negative electrode of the electrolytic capacitor EC3, and the ground terminal GND1 of the low dropout regulator U1 is connected with the power ground.

The model of the low dropout regulator U1 is TLE 4275.

As shown in fig. 3, the power supply module further includes a voltage reduction module, including:

a first end of an inductor L2 is connected with a power supply SY _5V, a second end of an inductor L2 is connected with a first end of a capacitor C11, a first end of a capacitor C13, a first end of a resistor R323 and a power supply input end VIN of a low dropout regulator U18, a second end of a capacitor C11 and a second end of a capacitor C13 are connected with a power supply ground, a ground end GND of the low dropout regulator U18 is connected with the power supply ground, an enable end EN of the low dropout regulator U18 is connected with a second end of the resistor R323, a power supply output end VOUT of a low dropout regulator U18 is connected with a first end of the resistor R10, a first end of a capacitor C17, a first end of the capacitor C167 and an anode of an electrolytic capacitor EC4, and a power supply output end VOUT of a low dropout regulator U18 outputs 3.3V; the feedback terminal FB of the low dropout regulator U18 is connected with the second terminal of the resistor R10, the first terminal of the resistor R324 and the second terminal of the capacitor C17, and the second terminal of the resistor R324, the second terminal of the capacitor C167 and the negative electrode of the electrolytic capacitor EC4 are connected with the power ground.

The model of the low dropout regulator U18 is MPQ 8904.

As shown in fig. 2, the power supply module further includes an ignition voltage detection module including:

the ignition power IGN is connected with a first end of a capacitor C112 and a first end of a resistor R286, a second end of the resistor R286 is connected with a first end of a resistor R288, a first end of a capacitor C113 and a first end of a resistor R287, a second end of the resistor R287 is connected with AN ignition voltage detection end P06_7/AN7/TOT1/IN5_ R of the microcontroller U2, and a second end of the capacitor C112, a second end of the resistor R288 and a second end of the capacitor C113 are connected with the power ground.

In the scheme, the method comprises the following steps: the power supply module further includes an ignition detection module, as shown in fig. 2, the ignition detection module includes:

AN ignition power IGN is connected with a first end of a capacitor C1 and AN anode of a diode D6, a second end of a capacitor C1 is connected with a power ground, a cathode of a diode D6 is connected with a first end of a capacitor C170 and a first end of a magnetic bead FB6, a second end of a magnetic bead FB6 is connected with a first end of a capacitor C171 and a first end of a resistor R338, a second end of the resistor R338 is connected with a first end of a resistor R17 and a first end of a resistor R16, a second end of a resistor R16 is connected with a base of a triode Q36, a collector of the triode Q36 is connected with a first end of a resistor R339 and a first end of a resistor R340, a second end of the resistor R339 is connected with a power SY _5V, a second end of the resistor R340 is connected with a first end of a capacitor C169 and a first end of a resistor R341, a second end of the resistor R341 is connected with AN ignition detection end P10_0/PWM1P4/SIN2/TIN 3/AN 2838 of a capacitor U2, and a second end of the capacitor C39169 is connected with a second end of a resistor R338, The second terminal of the capacitor C170, the second terminal of the capacitor C171, the second terminal of the resistor R17, and the emitter of the transistor Q36 are connected to the power ground.

As shown in fig. 4 to 5, the light sensing module includes:

a power supply terminal VDD of the ambient light sensor U17 is connected to a first terminal of a capacitor C86 and a power supply 3.3V, a second terminal of a capacitor C86 is connected to a power ground, an address terminal ADDR of the ambient light sensor U17 and a ground terminal GND of the ambient light sensor U17 are connected to the power ground, a data terminal SDA of the ambient light sensor U17 is connected to a data low voltage terminal SDA1 of a voltage level converter U14 and a first terminal of a resistor R204, a clock terminal SCL of the ambient light sensor U17 is connected to a clock low voltage terminal SCL1 of a voltage level converter U14 and a first terminal of a resistor R205, a low voltage side reference power supply terminal VREF1 of the voltage level converter U14, a second terminal of the resistor R204, a second terminal of the resistor R205, and a first terminal of a capacitor C114 are connected to the power supply 3.3V,

the data high-voltage terminal SDA2 of the voltage level converter U14 is connected to the first terminal of the resistor R203, the data terminal P02_5/SEG33/OUT0_ R/INT13/SIN5_ R of the microcontroller U2, the clock high-voltage terminal SCL2 of the voltage level converter U14 is connected to the first terminal of the resistor R202, the clock terminal P03_0/V0/SEG36/PPG4_ B of the microcontroller U2, the high-voltage side reference power supply terminal VREF2 of the voltage level converter U14 is connected to the switch enable input EN of the voltage level converter U14, the first terminal of the resistor R201, the first terminal of the capacitor C154, the second terminal of the resistor R201, the second terminal of the resistor R202, the second terminal of the resistor R203 is connected to the power supply SY _5V, the ground terminal of the voltage level converter U14, the first terminal of the capacitor C114, and the second terminal of the capacitor C154 are connected to the power ground.

The model of the ambient light sensor U17 is OPT3001-Q1, and the model of the voltage level converter U14 is NLV9306 USG.

As shown in fig. 6, the control module includes:

a ground terminal VSS1 of the microcontroller U2 is connected with a power ground, an internal stabilized voltage supply stabilizing capacitor terminal C of the microcontroller U2 is connected with a first terminal of a capacitor C41, a second terminal of the capacitor C41 is connected with the power ground, an analog circuit power supply terminal AVCC of the microcontroller U2 is connected with a first terminal of a capacitor C48 and a power supply MCU _5V, an A/D converter high reference voltage input terminal AVRH of the microcontroller U2 is connected with a first terminal of a capacitor C49 and a power supply MCU _5V, a second terminal of a capacitor C48, a second terminal of a capacitor C49 and a first terminal of a capacitor C51 are connected with the power ground, an A/D converter high reference voltage input terminal AVRL of the microcontroller U2 and an analog circuit ground terminal AVSS are connected with the power ground, and a power supply terminal VCC1 of the microcontroller U2 is connected with a second terminal of the capacitor C51 and the power supply MCU _ 5V; a ground terminal VSS5 of the microcontroller U2 is connected with a power ground, an SMC power supply terminal DVCC1 of the microcontroller U2 is connected with a first terminal of a capacitor C54 and a power supply MCU _5V, and an SMC ground terminal DVSS1 of the microcontroller U2 and a second terminal of a capacitor C54 are connected with the power ground;

an SMC power supply terminal DVCC2 of the microcontroller U2 is connected with a first terminal of a capacitor C55 and a power supply MCU _5V, and an SMC ground terminal DVSS2 and a second terminal of a capacitor C55 of the microcontroller U2 are connected with a power supply ground; a power supply terminal VCC3 of the microcontroller U2 is connected with a first end of the capacitor C56 and the power supply MCU _ 5V; a second terminal of the capacitor C56 is connected to power ground;

the ground terminal VSS2 of the microcontroller U2 is connected with the power ground, the on-chip debug terminal DEBUGI/F of the microcontroller U2 is connected with the first terminal of the resistor R42 and the first terminal of the resistor R43, the second terminal of the resistor R42 is connected with the first terminal of the key S11, the second terminal of the key S11 is connected with the power ground, the second terminal of the resistor R43 is connected with the power MCU _5V,

an operation mode selection end MD of the microcontroller U2 is connected with a first end of a resistor R41, a reset end RSTX of the microcontroller U2 is connected with a first end of a capacitor C46, a first end of a capacitor C47 and a first end of a resistor R40, a second end of a resistor R40 is connected with a power supply MCU _5V, and a second end of a capacitor C46, a second end of a capacitor C47 and a second end of a resistor R41 are connected with the power supply ground;

a crystal oscillator input end X0 of the microcontroller U2 is connected with a first end of a crystal oscillator Y1 and a first end of a capacitor C45, a crystal oscillator output end X1 of the microcontroller U2 is connected with a second end of a crystal oscillator Y1 and a first end of a capacitor C44, and a second end of the capacitor C44 and a second end of a capacitor C45 are connected with a power ground;

ground terminal VSS3 of microcontroller U2 is connected with power ground, power supply terminal VCC2 of microcontroller U2 is connected with the first end of capacitor C43, power MCU _5V, the second end of capacitor C43 is connected with power ground, ground terminal VSS4 of microcontroller U2 is connected with power ground, power supply terminal VCC of microcontroller U2 is connected with the first end of capacitor C42 and power MCU _5V, the second end of capacitor C42 is connected with power ground.

The model of the microcontroller U2 is MB96F696 RB.

The display screen is connected with the microcontroller U2, and the microcontroller U2 adjusts the display brightness of the display screen according to the ambient light intensity collected by the light sensing module.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.