阅读说明：本技术 源极驱动器及其控制方法、显示装置及其驱动系统 (Source driver and control method thereof, display device and driving system thereof ) 是由 陈燚 杨飞 许静波 王糖祥 张星 于 2021-08-10 设计创作，主要内容包括：本申请提供一种源极驱动器及其控制方法、显示装置及其驱动系统。所述源极驱动器包括驱动电路及数据信号输出端。驱动电路包括信号转换子电路及输出缓冲子电路,输出缓冲子电路包括输出控制子电路,信号转换子电路的输出端与输出控制子电路的输入端相连,输出控制子电路的输出端与数据信号输出端相连。信号转换子电路被配置为将接收的输入信号转换为数据信号,并将数据信号传输至输出控制子电路；像素电路的感测阶段包括复位阶段、感测数据写入阶段、充电阶段和采样阶段；输出控制子电路被配置为：在感测数据写入阶段,输出控制子电路将接收的数据信号传输至数据信号输出端；在充电阶段和采样阶段,输出控制子电路使数据信号输出端为高阻态。(The application provides a source driver, a control method thereof, a display device and a driving system thereof. The source driver comprises a driving circuit and a data signal output end. The driving circuit comprises a signal conversion sub-circuit and an output buffer sub-circuit, the output buffer sub-circuit comprises an output control sub-circuit, the output end of the signal conversion sub-circuit is connected with the input end of the output control sub-circuit, and the output end of the output control sub-circuit is connected with the data signal output end. The signal conversion sub-circuit is configured to convert the received input signal into a data signal and transmit the data signal to the output control sub-circuit; the sensing phase of the pixel circuit comprises a reset phase, a sensing data writing phase, a charging phase and a sampling phase; the output control sub-circuit is configured to: in the sensing data writing stage, the output control sub-circuit transmits the received data signal to the data signal output end; in the charging stage and the sampling stage, the output control sub-circuit makes the data signal output end in a high impedance state.)

1. A source driver for providing a data signal to the pixel circuit; the source driver comprises a driving circuit and a data signal output end;

the driving circuit comprises a signal conversion sub-circuit and an output buffer sub-circuit, the output buffer sub-circuit comprises an output control sub-circuit, the output end of the signal conversion sub-circuit is connected with the input end of the output control sub-circuit, and the output end of the output control sub-circuit is connected with the data signal output end;

the sensing phase of the pixel circuit comprises a reset phase, a sensing data writing phase, a charging phase and a sampling phase;

the signal conversion sub-circuit is configured to convert a received input signal into a data signal and transmit the data signal to the output control sub-circuit; the output control sub-circuit is configured to: in a sensing data writing phase of the pixel circuit, the output control sub-circuit transmits the received data signal to the data signal output end so that the data signal output end transmits the data signal to the pixel circuit; in the charging phase and the sampling phase of the pixel circuit, the output control sub-circuit makes the data signal output end be in a high impedance state.

2. The source driver of claim 1, wherein the output control sub-circuit comprises a transistor comprising a first pole, a second pole, and a gate; the input end of the output control sub-circuit is the first pole, and the output end of the output control sub-circuit is the second pole; the first pole is connected with the output end of the signal conversion sub-circuit, and the second pole is connected with the data signal output end; the grid is connected with a grid signal; the grid signal controls the on and off of the transistor;

in the sensing data writing phase of the pixel circuit, the gate signal controls the transistor to be turned on, and the transistor transmits the received data signal to the data signal output end; in the charging stage and the sampling stage of the pixel circuit, the gate signal controls the transistor to be cut off, so that the data signal output end is in a high-impedance state.

3. The source driver of claim 2, wherein the transistor is an N-type transistor, and the gate signal is high during the sensing data writing phase of the pixel circuit; in the charging phase and the sampling phase of the pixel circuit, the gate signal is at a low level.

4. The source driver of claim 2, wherein the transistor is a P-type transistor, and the gate signal is at a low level during the sensing data writing phase of the pixel circuit; the gate signal is at a high level during the charging phase and the sampling phase of the pixel circuit.

5. The source driver of claim 1, wherein the output buffer sub-circuit further comprises an operational amplifier, an input of the operational amplifier being electrically connected to the output of the signal conversion sub-circuit, an output of the operational amplifier being electrically connected to the input of the output control sub-circuit; the input impedance of the operational amplifier is greater than the output impedance; the input voltage of the operational amplifier is equal to the output voltage of the operational amplifier.

6. A driving system of a display device, comprising the source driver of any one of claims 1 to 5.

7. A display device comprising a display panel and the driving system of claim 6; the display panel comprises a data signal line, a source electrode driver in the driving system is connected with the data signal line, and the data signal line is electrically connected with a pixel circuit of the display panel.

8. A control method of a source driver is used for the source driver, and is characterized in that the source driver is used for providing data signals for a pixel circuit; the source electrode driver comprises a driving circuit and a data signal output end;

the driving circuit comprises a signal conversion sub-circuit and an output buffer sub-circuit, the output buffer sub-circuit comprises an output control sub-circuit, the output end of the signal conversion sub-circuit is connected with the input end of the output buffer sub-circuit, and the output end of the output control sub-circuit is connected with the data signal output end; the data conversion sub-circuit is configured to convert a received input signal into a data signal and transmit the data signal to the output control sub-circuit; the sensing phase of the pixel circuit comprises a reset phase, a sensing data writing phase, a charging phase and a sampling phase;

the control method comprises the following steps:

in the sensing data writing phase of the pixel circuit, controlling the output control sub-circuit to transmit the received data signal to the data signal output end;

and in the charging stage and the sampling stage of the pixel circuit, controlling the output control sub-circuit to enable the data signal output end to be in a high-impedance state.

9. The method of claim 8, wherein the output control sub-circuit comprises a transistor comprising a first pole, a second pole, and a gate; the input end of the output control sub-circuit is the first pole, and the output end of the output control sub-circuit is the second pole; the first pole is connected with the output end of the signal conversion sub-circuit, and the second pole is connected with the data signal output end; the grid is connected with a control signal; the control signal controls the on and off of the transistor; the control method further includes:

controlling the transistor to be turned on by controlling the control signal in the sensing data writing phase of the pixel circuit, the transistor transmitting the received data signal to the data signal output terminal;

and in the charging stage and the sampling stage of the pixel circuit, the transistor is controlled to be cut off by controlling the control signal, so that the data signal output end is in a high-impedance state.

10. The method of claim 9, wherein the transistor is an N-type transistor, and further comprising:

in the sensing data writing stage of the pixel circuit, controlling the control signal to be in a high level to enable the transistor to be conducted; in the charging stage and the sampling stage of the pixel circuit, controlling the control signal to be at a low level to cut off the transistor;

alternatively, the first and second electrodes may be,

the transistor is a P-type transistor, and the control method further comprises:

in the sensing data writing stage of the pixel circuit, controlling the control signal to be at a low level to enable the transistor to be conducted; and in the charging phase and the sampling phase of the pixel circuit, controlling the control signal to be in a high level to cut off the transistor.

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a source driver, a control method thereof, a display device and a driving system thereof.

Background

The display device includes a display panel and a driving system, the driving system provides various signals for pixel circuits of the display panel, for example, a source driver of the driving system provides data signals for the pixel circuits. In order to improve the uniformity of the display brightness of the sub-pixels of the display panel, the sub-pixels are generally externally compensated, the pixel circuit is connected with a sensing signal line, an electric signal of the pixel circuit is collected through the sensing signal line, and the external compensation is performed according to a voltage signal.

In the existing display device, there is coupling between the data signal line and the sensing signal line, and the signal size of the data signal line affects the accuracy of the signal sensed by the sensing signal line.

Disclosure of Invention

According to a first aspect of embodiments of the present application, there is provided a source driver for providing a data signal to a pixel circuit. The source electrode driver comprises a driving circuit and a data signal output end;

the driving circuit comprises a signal conversion sub-circuit and an output buffer sub-circuit, the output buffer sub-circuit comprises an output control sub-circuit, the output end of the signal conversion sub-circuit is connected with the input end of the output control sub-circuit, and the output end of the output control sub-circuit is connected with the data signal output end;

the sensing phase of the pixel circuit comprises a reset phase, a sensing data writing phase, a charging phase and a sampling phase;

the signal conversion sub-circuit is configured to convert a received input signal into a data signal and transmit the data signal to the output control sub-circuit; the output control sub-circuit is configured to: in a sensing data writing phase of the pixel circuit, the output control sub-circuit transmits the received data signal to the data signal output end so that the data signal output end transmits the data signal to the pixel circuit; in the charging phase and the sampling phase of the pixel circuit, the output control sub-circuit makes the data signal output end be in a high impedance state.

In one embodiment, the output control sub-circuit comprises a transistor comprising a first pole, a second pole, and a gate; the input end of the output control sub-circuit is the first pole, and the output end of the output control sub-circuit is the second pole; the first pole is connected with the output end of the signal conversion sub-circuit, and the second pole is connected with the data signal output end; the grid is connected with a grid signal; the grid signal controls the on and off of the transistor;

in the sensing data writing phase of the pixel circuit, the gate signal controls the transistor to be turned on, and the transistor transmits the received data signal to the data signal output end; in the charging stage and the sampling stage of the pixel circuit, the gate signal controls the transistor to be cut off, so that the data signal output end is in a high-impedance state.

In one embodiment, the transistor is an N-type transistor, and the gate signal is at a high level during the sensing data writing phase of the pixel circuit; in the charging phase and the sampling phase of the pixel circuit, the gate signal is at a low level.

In one embodiment, the transistor is a P-type transistor, and the gate signal is at a low level during the sensing data writing phase of the pixel circuit; the gate signal is at a high level during the charging phase and the sampling phase of the pixel circuit.

In one embodiment, the output buffer sub-circuit further comprises an operational amplifier, an input terminal of the operational amplifier is electrically connected with an output terminal of the signal conversion sub-circuit, and an output terminal of the operational amplifier is electrically connected with an input terminal of the output control sub-circuit; the input impedance of the operational amplifier is greater than the output impedance; the input voltage of the operational amplifier is equal to the output voltage of the operational amplifier.

According to a second aspect of embodiments of the present application, there is provided a driving system of a display device, including the source driver described above.

According to a third aspect of embodiments of the present application, there is provided a display device, comprising a display panel and the above-mentioned driving system; the display panel comprises a data signal line, a source electrode driver in the driving system is connected with the data signal line, and the data signal line is electrically connected with a pixel circuit of the display panel.

According to a fourth aspect of the embodiments of the present application, there is provided a control method of a source driver for supplying a data signal to a pixel circuit; the source electrode driver comprises a driving circuit and a data signal output end;

the driving circuit comprises a signal conversion sub-circuit and an output buffer sub-circuit, the output buffer sub-circuit comprises an output control sub-circuit, the output end of the signal conversion sub-circuit is connected with the input end of the output buffer sub-circuit, and the output end of the output control sub-circuit is connected with the data signal output end; the data conversion sub-circuit is configured to convert a received input signal into a data signal and transmit the data signal to the output control sub-circuit; the sensing phase of the pixel circuit comprises a reset phase, a sensing data writing phase, a charging phase and a sampling phase;

the control method comprises the following steps:

in the sensing data writing phase of the pixel circuit, controlling the output control sub-circuit to transmit the received data signal to the data signal output end;

and in the charging stage and the sampling stage of the pixel circuit, controlling the output control sub-circuit to enable the data signal output end to be in a high-impedance state.

In one embodiment, the output control sub-circuit comprises a transistor comprising a first pole, a second pole, and a gate; the input end of the output control sub-circuit is the first pole, and the output end of the output control sub-circuit is the second pole; the first pole is connected with the output end of the signal conversion sub-circuit, and the second pole is connected with the data signal output end; the grid is connected with a control signal; the control signal controls the on and off of the transistor; the control method further includes:

controlling the transistor to be turned on by controlling the control signal in the sensing data writing phase of the pixel circuit, the transistor transmitting the received data signal to the data signal output terminal;

and in the charging stage and the sampling stage of the pixel circuit, the transistor is controlled to be cut off by controlling the control signal, so that the data signal output end is in a high-impedance state.

In one embodiment, the transistor is an N-type transistor, and the control method further comprises:

in the sensing data writing stage of the pixel circuit, controlling the control signal to be in a high level to enable the transistor to be conducted; in the charging stage and the sampling stage of the pixel circuit, controlling the control signal to be at a low level to cut off the transistor;

alternatively, the first and second electrodes may be,

the transistor is a P-type transistor, and the control method further comprises:

in the sensing data writing stage of the pixel circuit, controlling the control signal to be at a low level to enable the transistor to be conducted; and in the charging phase and the sampling phase of the pixel circuit, controlling the control signal to be in a high level to cut off the transistor.

The embodiment of the application achieves the main technical effects that:

in the source driver, the control method thereof, the display device and the driving system thereof provided by the embodiment of the application, in the sensing data writing stage of the pixel circuit, the output control sub-circuit transmits the received data signal to the data signal output end, and the output control sub-circuit does not influence the pixel circuit to receive the sensing data signal in the sensing data writing stage; in the charging stage and the sampling stage of the pixel circuit, the output control sub-circuit enables the data signal output end to be in a high-impedance state, so that the interference of the data signal to the sensing signal can be avoided, and the precision of the signal detected by the pixel circuit in the sensing stage can be improved; and because the data signal does not interfere with the sensing signal in the charging stage and the sampling stage of the pixel circuit, the pixel circuit can always perform sensing in the charging stage and the sampling stage of the pixel circuit, and compared with the scheme that the sensing accuracy is influenced by the sensing signal in the sensing stage of the pixel circuit in order to avoid the influence of the data signal on the sensing signal, the size of the sensing signal is changed due to the change of the size of the data signal, and the duration of the recovery stage of the sensing signal in the duration of one frame of picture can be shortened or the recovery stage of the sensing signal can not be set, and the duration of one frame of picture of the display device where the source driver is located cannot be increased.

Drawings

Fig. 1A is a schematic structural diagram of a display device according to an exemplary embodiment of the present application;

fig. 1B is a schematic partial structural diagram of a display device according to an exemplary embodiment of the present application;

fig. 1C is a schematic structural diagram of a pixel circuit provided in an exemplary embodiment of the present application;

FIG. 1D is a timing diagram of a pixel circuit in a sensing phase according to an exemplary embodiment of the present application;

FIG. 1E is a timing diagram of the data signal lines and the sensing signal lines in a sensing phase according to an exemplary embodiment of the present disclosure;

FIG. 2 is a block diagram of a source driver provided in an exemplary embodiment of the present application;

FIG. 3 is a circuit diagram of an output buffer sub-circuit of a source driver according to an exemplary embodiment of the present application;

fig. 4 is a timing diagram of a source driver according to an exemplary embodiment of the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

The embodiment of the application provides a source driver, a control method thereof, a display device and a driving system thereof. The source driver, the control method thereof, the display device and the driving system thereof in the embodiments of the present application will be described in detail below with reference to the accompanying drawings. Features in the embodiments described below may complement or be combined with each other without conflict.

As shown in fig. 1A, fig. 1B and fig. 1C, fig. 1A is a schematic structural diagram of an exemplary embodiment of a display device of the present application, fig. 1B is a schematic partial structural diagram of an exemplary embodiment of a display device of the present application, and fig. 1C is a schematic structural diagram of a pixel circuit of the present application. As shown in fig. 1A, the display device may include: a plurality of sub-pixel units P, each of which may include a pixel circuit, and a detection unit. The display device may include: a source driver 5, a timing controller 6, and a gate driver 7. The source driver 5 is connected to the pixel circuits through data lines, and the gate driver 7 is connected to the pixel circuits through scan lines.

As shown in fig. 1B, the pixel circuit may include: a second switching unit 2, a driving transistor DT, a first switching unit 1, and a capacitor C. A second end of the second switch unit 2 is connected with a sensing line SENSE; a first terminal of the driving transistor DT is connected to a first power terminal VDD, and a second terminal thereof is connected to a first terminal of the second switching unit 2; the first end of the first switch unit 1 is connected with a DATA signal line DATA, and the second end is connected with the grid electrode of the driving transistor DT; one electrode of the capacitor C is connected to the gate of the driving transistor DT; the detection unit may be used to detect the mobility of the driving transistor. The detection unit further includes: a third switching unit 3 and a fourth switching unit 4. A first terminal of the fourth switching unit 4 may be connected to the sensing signal line SENSE, a second terminal may be connected to the Reset signal terminal Reset, and a control terminal may be connected to the first control signal terminal SW 2; a first terminal of the third switching unit 3 may be connected to the sensing signal line SENSE, a second terminal may be connected to the sensing signal terminal Sen, and a control terminal may be connected to the second control signal terminal SW 1.

As shown in fig. 1C, the first switching unit 1 may include a switching transistor T1, and the second switching unit 2 may include a sensing transistor T2. A first switch transistor T1 having a first electrode connected to the DATA signal line DATA, a second electrode connected to the gate of the driving transistor DT, and a gate connected to the first control signal terminal G1; a first electrode of the driving transistor DT is connected to a first power terminal VDD, a second electrode thereof is connected to one electrode of a light emitting unit OLED, and the other electrode thereof is connected to a ground terminal GND; the first pole of the second switching transistor T2 is connected to the second pole of the driving transistor DT, the second pole is connected to the sensing signal line SENSE, and the gate is connected to the second control signal terminal G2; the capacitor C is connected between the grid electrode and the second electrode of the driving transistor DT; the sensing signal line SENSE is connected to an analog-to-digital converter ADC through a first switch unit 1, and is also connected to a Reset signal terminal Reset through a second switch unit 2. The data signal lines and the sensing signal lines connected to the same pixel circuit are arranged in parallel and are positioned in the same black matrix area between the adjacent pixel units. The control terminal of the first switch unit 1 is connected to the control signal terminal SW1, and the control terminal of the second switch unit 2 is connected to the control signal terminal SW 2. The control signal ends are all conducted with the switch units connected with the control signal ends under a high level state.

As shown in fig. 1D, the sensing phase of the pixel circuit may include: a reset phase t1, a sensed data write phase t2, a charge phase t3, and a sampling phase t 4. Among them, the reset phase t1, the data write phase t2, the charge phase t3, and the sampling phase t4 may be located in a blank phase between adjacent frames of the display panel. In the Reset period T1, the first switching transistor T1 and the second switching transistor T2 are turned on, the DATA signal line DATA jumps from the driving voltage to the detection voltage, and the Reset signal terminal Reset inputs the Reset voltage to the sensing signal line; in the DATA writing phase T2, the first control signal terminal G1 outputs a high level first, the second control signal terminal G2 outputs a high level, the first switch transistor T1 and the second switch transistor T2 are turned on, and the first electrode of the first switch transistor T1 receives the sensing DATA signal provided by the DATA signal line DATA and writes the sensing DATA signal into the storage capacitor C; in the charging phase T3, the first switching transistor T1 and the second switching transistor T2 are continuously turned on, the DATA signal line DATA charges the sensing signal line SENSE, and the sensing signal line SENSE gradually increases in voltage; in the sensing phase T4, the first and second switching transistors T1 and T2 are turned off, and the external sensing unit SENSEs the voltage on the sensing signal line SENSE, thereby acquiring the mobility of the driving transistor DT by the voltage on the sensing line SENSE.

As described in the background, there is coupling between the data signal line and the sensing signal line, and the signal magnitude of the data signal line affects the accuracy of the signal sensed by the sensing signal line. Referring specifically to fig. 1E, due to the coupling between the DATA signal line DATA and the sensing signal line SENSE, when the level of the DATA signal received by the DATA signal line DATA increases, the level of the sensing signal received by the sensing signal line SENSE is pulled high, and when the level of the DATA signal received by the DATA signal line DATA decreases, the sensing signal acquired by the sensing signal line SENSE is pulled low, that is, the DATA signal received by the DATA signal line affects the accuracy of the sensing signal acquired by the sensing signal line SENSE. In order to avoid the influence of the DATA signal line DATA on the sensing signal collected by the sensing signal line SENSE, it is an option that sensing is not performed during the time when the sensing signal of the sensing signal line SENSE is restored to the initial value (the restoration phase shown in fig. 1E), which results in an increase in the duration of one frame of the display device.

The embodiment of the application provides a source driver, which can solve the technical problem. The source driver is used for providing data signals for the pixel circuit. Referring to fig. 2 and 3, the source driver 100 includes a driving circuit 101 and a data signal output terminal Vout.

The display device where the source driver is located comprises a display panel, wherein the display panel comprises a plurality of sub-pixels and a plurality of pixel circuits, the sub-pixels are in one-to-one correspondence with the pixel circuits, and the pixel circuits are used for driving the corresponding sub-pixels. The display panel further comprises a plurality of data signal lines, each pixel circuit is connected with one data signal line, and the data signals provided by the source electrode driver are transmitted to the pixel circuits through the data signal lines.

When external compensation is needed to be carried out on the pixel circuit, the pixel circuit at least comprises the following two stages in the working process: a display drive phase of the pixel circuit and a sensing phase of the pixel circuit. The display driving stage of the pixel circuit comprises a display data writing stage, and in the display data writing stage of the pixel circuit, the data signal line writes the data signal provided by the source electrode driver into the pixel circuit of the sub-pixel. In a sensing phase of the pixel circuit, the sensing signal line collects a sensing signal. As shown in fig. 1D, the sensing phases of the pixel circuit include a reset phase t1, a sensing data write phase t2, a charge phase t3, and a sampling phase t 4.

The driving circuit 101 includes a signal conversion sub-circuit 10 and an output buffer sub-circuit 20, and the output buffer sub-circuit 20 includes an output control sub-circuit 22. The output terminal of the signal conversion sub-circuit 10 is connected to the input terminal of the output control sub-circuit 22, and the output terminal of the output control sub-circuit 22 is connected to the data signal output terminal Vout.

The signal conversion sub-circuit 10 is configured to convert a received input signal into a data signal and to transmit the data signal to the output control sub-circuit 22. The output control sub-circuit 22 is configured to: in the sensing DATA writing phase of the pixel circuit, the output control sub-circuit 22 transmits the received DATA signal to the DATA signal output terminal Vout, so that the DATA signal output terminal Vout transmits the DATA signal to the DATA signal line DATA; in the charging phase and the sampling phase of the pixel circuit, the output control sub-circuit 22 makes the data signal output terminal Vout in a high-resistance state. When the data signal output terminal Vout is in a high impedance state, the level of the data signal line connected to the data signal output terminal Vout is kept at the previous level and does not change. In the source driver provided in the embodiment of the present application, in the sensing data writing stage of the pixel circuit, the output control sub-circuit transmits the received data signal to the data signal output terminal, and the output control sub-circuit does not affect the pixel circuit to receive the data signal in the sensing data writing stage; in the charging stage and the sampling stage of the pixel circuit, the output control sub-circuit enables the data signal output end to be in a high-impedance state, so that the interference of the data signal to the sensing signal can be avoided, and the precision of the signal detected by the pixel circuit in the sensing stage can be improved; in addition, since the data signal does not interfere with the sensing signal in the charging stage and the sampling stage of the pixel circuit, the pixel circuit can always perform sensing in the sensing stage of the pixel circuit, and compared with the sensing stage of the pixel circuit, in order to avoid the influence of the data signal on the sensing signal and further influence on the sensing precision, the size of the sensing signal is changed due to the change of the size of the data signal, and the duration of the recovery stage of the sensing signal in the duration of one frame of picture can be shortened or the duration of one frame of picture of the display device where the source driver is located can not be increased due to the fact that the pixel circuit does not perform sensing in the recovery stage of the sensing signal when the sensing signal is recovered to the stable signal.

In one embodiment, referring again to FIG. 1D, the sensing phase is followed by a digital-to-analog conversion phase t5 and a data transmission phase t 6. In a digital-to-analog conversion stage t5, the chip converts the voltage on the sensing line Sense sensed by the sensing unit into a digital signal; in the data transmission stage t6, the chip transmits the digital signal to the processor so that the processor processes the received signal. During the digital-to-analog conversion period t5, the data signal output terminal Vout is kept in the high impedance state.

In one embodiment, the output control sub-circuit 22 includes a transistor 221, the transistor 221 including a first pole N3, a second pole N4, and a gate N5. The input terminal of the output control sub-circuit 22 is the first pole N3, and the output terminal of the output control sub-circuit 22 is the second pole N4. The first pole N3 is connected to the output terminal of the signal conversion sub-circuit 10, the second pole N4 is connected to the data signal output terminal Vout, and the gate N5 is connected to a gate signal. The gate signal controls the transistor 221 to be turned on and off. In a sensing data writing stage of the pixel circuit, the gate signal controls the transistor 221 to be turned on, so that the transistor 221 transmits the received data signal to the data signal output terminal Vout; in the charging phase and the sampling phase of the pixel circuit, the gate signal controls the transistor 221 to be turned off, so that the data signal output terminal Vout is in a high-resistance state.

When the gate signal control transistor 221 is turned on, the transistor 221 transmits the data signal output by the signal conversion sub-circuit 10 to the data signal output terminal Vout, and the data signal output terminal Vout transmits the data signal to the data signal line of the display panel, so that the pixel circuit receives the data signal transmitted by the data signal line. When the gate signal control transistor 221 is turned off, the data signal output terminal Vout is in a high impedance state, and the signal level of the data signal line maintains the signal level at the previous time without changing, so that the interference of the sensing signal caused by the change of the data signal level in the sensing stage of the pixel circuit can be avoided.

By providing the output control sub-circuit 22 with the transistor 221, the circuit of the output control sub-circuit 22 is relatively simple and easy to implement, and the on/off of the output transistor can be controlled by controlling the gate signal, and the control of the output control sub-circuit 22 is relatively simple.

In one embodiment, the transistor 221 is an N-type transistor, and the gate signal is at a high level during a sensing data writing phase of the pixel circuit; in the charging phase and the sampling phase of the pixel circuit, the gate signal is at a low level. The first pole N3 is the drain of the N-type transistor, and the second pole N4 is the source of the N-type transistor.

When the grid signal of the N-type transistor is at a high level, the N-type transistor is conducted; when the grid signal of the N-type transistor is in a low level, the N-type transistor is cut off.

Referring to fig. 4, in the sensing data writing phase T1 of the pixel circuit, the data signal output terminal Vout outputs a high level first, and then outputs a low level; in the charging phase and the sampling phase T2 of the sensing phase, the gate signal received by the gate N5 is at a high level, the N-type transistor is turned off, and the data signal output terminal Vout is in a high resistance state; the phase between T1 and T2 is a reset phase of the sensing phase of the pixel circuit, and the data signal output terminal Vout outputs a high level. As can be seen from fig. 4, in the charging phase and the sampling phase T2 of the sensing phase, the waveform of the data signal output by the data signal output terminal Vout is not changed, and since the data signal output terminal Vout is in a high impedance state, which is equivalent to the source driver being disconnected from the data signal line, the data signal does not affect the accuracy of the sensing signal.

In another embodiment, the transistor 221 is a P-type transistor, and the gate signal is at a low level during a sensing data writing phase of the pixel circuit; the gate signal is at a high level during the charging phase and the sampling phase of the pixel circuit. The first pole N3 is a source of a P-type transistor, and the second pole N4 is a drain of the P-type transistor.

When the grid signal of the P-type transistor is at a low level, the P-type transistor is conducted; when the grid signal of the P-type transistor is in a high level, the P-type transistor is cut off.

That is, in the embodiment of the present application, the transistor 221 may be an N-type transistor or a P-type transistor, and the transistor 221 is selected more.

In one embodiment, the output buffer sub-circuit 20 further includes an operational amplifier 21, an input terminal N1 of the operational amplifier 21 is electrically connected to the output terminal of the signal conversion sub-circuit 10, and an output terminal N2 of the operational amplifier 21 is electrically connected to the input terminal of the output control sub-circuit 22. The input impedance of the operational amplifier 21 is greater than the output impedance; the input voltage of the operational amplifier 21 is equal to the output voltage of the operational amplifier 21, that is, the voltage gain of the operational amplifier 21 is 1. The operational amplifier 21 has a high input impedance and is open-circuited to a preceding stage circuit; the output impedance of the operational amplifier 21 is low, and is equivalent to a constant voltage source for the subsequent circuit, so that the output voltage of the operational amplifier 21 is not affected by the impedance of the subsequent circuit, and the operational amplifier 21 can play a role of buffering and isolation.

The operational amplifier 21 includes a first power supply terminal connected to the high-level power supply terminal VDD and a second power supply terminal connectable to the ground terminal GND.

In one embodiment, referring again to fig. 2, the signal conversion sub-circuit 10 includes a serial-to-parallel converter 11, a latch 12, and a digital-to-analog converter 13. The output end of the serial-parallel converter 11 is connected with the input end of the latch 12, the output end of the latch 12 is connected with the input end of the digital-to-analog converter 13, and the output end of the digital-to-analog converter 13 is connected with the input end of the output buffer circuit.

The serial-parallel converter 11 receives the two pairs of differential signals, performs serial-parallel conversion on the received signals, converts the serial input mode of the signals into the parallel output mode, and outputs the converted signals to the latch 12. One of the differential signals includes signal CED0P and signal CED0N, and the other differential signal includes signal CED1P and signal CED 1N. The latch 12 buffers the received signal. The digital-to-analog converter 13 performs digital-to-analog conversion on the signal output by the latch 12, and the obtained analog signal is also a data signal, and the digital-to-analog converter 13 sends the obtained data signal to the output buffer circuit.

The digital-to-analog converter also receives a clock signal, and when the clock signal is at a high level, the digital-to-analog converter 13 outputs a data signal. Referring again to fig. 4, the clock signal STB received by the digital-to-analog converter is high every specified time period.

The embodiment of the application also provides a control method of the source driver. The control method of the source driver is used for the source driver. The source electrode driver is used for providing data signals for the pixel circuit; the source driver comprises a driving circuit and a data signal output end. The driving circuit comprises a signal conversion sub-circuit and an output buffer sub-circuit, the output buffer sub-circuit comprises an output control sub-circuit, the output end of the signal conversion sub-circuit is connected with the input end of the output buffer sub-circuit, and the output end of the output control sub-circuit is connected with the data signal output end; the data conversion sub-circuit is configured to convert a received input signal into a data signal and transmit the data signal to the output control sub-circuit.

The control method of the source driver comprises the following steps:

in a sensing data writing stage of the pixel circuit, controlling the output control sub-circuit to enable the output control sub-circuit to transmit the received data signal to the data signal output end;

and in the charging stage and the sampling stage of the pixel circuit, controlling the output control sub-circuit to enable the data signal output end to be in a high-impedance state.

In the control method of the source driver provided in the embodiment of the application, in the sensing data writing stage of the pixel circuit, the output control sub-circuit is controlled to enable the output control sub-circuit to transmit the received data signal to the data signal output end, so that the pixel circuit is ensured to receive the sensing data signal in the sensing data writing stage; in the charging stage and the sampling stage of the pixel circuit, the output control sub-circuit is controlled to enable the data signal output end to be in a high-impedance state, so that the interference of the data signal to the sensing signal can be avoided, and the accuracy of the signal detected by the pixel circuit in the sensing stage is improved; and because the data signal does not interfere with the sensing signal in the charging stage and the sampling stage of the pixel circuit, the pixel circuit can always perform sensing in the sensing stage of the pixel circuit, and compared with the scheme that in the sensing stage of the pixel circuit, in order to avoid the influence of the data signal on the sensing signal and further influence on the sensing precision, the size of the sensing signal is changed due to the change of the size of the data signal, and the pixel circuit does not perform sensing in the recovery stage when the sensing signal is recovered to the temperature signal, the duration of the recovery stage of the sensing signal in the duration of one frame of picture can be shortened in the embodiment of the application, or the recovery stage of the sensing signal can not be set, and the duration of one frame of picture of the display device where the source driver is located cannot be increased.

In one embodiment, the output control sub-circuit comprises a transistor comprising a first pole, a second pole, and a gate; the input end of the output control sub-circuit is the first pole, and the output end of the output control sub-circuit is the second pole. The first pole is connected with the output end of the signal conversion sub-circuit, and the second pole is connected with the data signal output end; the grid is connected with a control signal; the control signal controls the on and off of the transistor. The control method further includes:

in a sensing data writing phase of the pixel circuit, controlling the transistor to be conducted by controlling the control signal, wherein the transistor transmits a received data signal to the data signal output end;

and in the charging stage and the sampling stage of the pixel circuit, the transistor is controlled to be cut off by controlling the control signal, so that the data signal output end is in a high-impedance state.

Further, the transistor is an N-type transistor, and the control method further includes:

in a sensing data writing stage of the pixel circuit, controlling the control signal to be in a high level to enable the transistor to be conducted, and transmitting the received data signal to the data signal output end by the transistor; and in the charging stage and the sampling stage of the pixel circuit, the control signal is controlled to be at a low level, so that the transistor is cut off, and the data signal output end is in a high-impedance state.

In another embodiment, the transistor is a P-type transistor, and the control method further includes:

in a sensing data writing stage of the pixel circuit, controlling the control signal to be in a low level to enable the transistor to be conducted, wherein the transistor transmits the received data signal to the data signal output end; and in the charging stage and the sampling stage of the pixel circuit, controlling the control signal to be in a high level to enable the transistor to be cut off, and transmitting the received data signal to the data signal output end by the transistor.

The source driver and the control method of the source driver provided by the embodiment of the application belong to the same inventive concept, and the details and the advantageous effects thereof can be mutually referred to and are not repeated.

An embodiment of the present application further provides a driving system of a display device, where the driving system of the display device includes the source driver in any of the above embodiments.

The driving system of the display device may further include a timing controller inputting signals to the source driver, for example, inputting signals to an input terminal of the source driver, and inputting gate signals to the control output sub-circuit.

The embodiment of the application also provides a display device. The display device comprises a display panel and the driving system. The display panel comprises a data signal line, a source electrode driver in the driving system is connected with the data signal line, and the data signal line is electrically connected with a pixel circuit of the display panel. The source driver supplies a data signal to the data signal line.

In one embodiment, the display panel includes a plurality of sub-pixels and a plurality of pixel circuits, the pixel circuits may correspond to the sub-pixels one by one, and the pixel circuits are used for driving the corresponding sub-pixels. The plurality of sub-pixels can be divided into a plurality of rows of sub-pixels, and the pixel circuits corresponding to the sub-pixels in each row can be connected to the same data signal line. That is, the same column of subpixels is driven by the same data signal line.

In one embodiment, the Display panel may be an OLED (Organic Light-Emitting Diode) Display panel, and may also be an LCD (Liquid Crystal Display).

It is noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer or intervening layers may also be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or intervening layers or elements may also be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer between the two layers or elements, or more than one intermediate layer or element may also be present. Like reference numerals refer to like elements throughout.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.