Electronic paper display device and driving method thereof
阅读说明:本技术 一种电子纸显示装置及其驱动方法 (Electronic paper display device and driving method thereof ) 是由 高一男 马青青 李硕 田超 秦国杰 袁祥 韩军鹏 王天娇 袁银 张立中 于 2019-11-13 设计创作,主要内容包括:本发明实施例提供一种电子纸显示装置及其驱动方法,涉及显示技术领域,可以解决低温下,微杯显示第三颜色时出现混色的问题。电子纸显示装置的驱动方法包括:在所述微杯显示第三颜色的情况下,向所述第一电极施加第一脉冲信号;所述第一脉冲信号包括在显示阶段,向所述第一电极依次施加的预处理信号和第一子脉冲信号;所述预处理信号用于使所述第一颜色粒子和所述第三颜色粒子混合,且使所述第一颜色粒子和所述第三颜色粒子相对于所述第二颜色粒子靠近所述显示侧;所述第一子脉冲信号用于使所述第三颜色粒子相对于所述第一颜色粒子和所述第二颜色粒子靠近所述显示侧,以使所述微杯显示第三颜色。用于电子纸显示装置中。(The embodiment of the invention provides an electronic paper display device and a driving method thereof, relates to the technical field of display, and can solve the problem of color mixing when a micro-cup displays a third color at low temperature. The driving method of the electronic paper display device includes: applying a first pulse signal to the first electrode in a case where the microcups display a third color; the first pulse signal comprises a preprocessing signal and a first sub-pulse signal which are sequentially applied to the first electrode in a display stage; the pre-processing signal is used to mix the first color particles and the third color particles and to bring the first color particles and the third color particles closer to the display side relative to the second color particles; the first sub-pulse signal is used for enabling the third color particles to be close to the display side relative to the first color particles and the second color particles so as to enable the microcups to display a third color. The method is used in the electronic paper display device.)
1. A driving method of an electronic paper display device comprises a plurality of microcups, and a first electrode and a second electrode which are arranged on two opposite sides of each microcup; the microcups comprise first color particles, second color particles and third color particles, the electric charges of the first color particles are opposite to the electric charges of the second color particles, and the electric charges of the first color particles are the same as the electric charges of the third color particles; a ratio of a charge amount to a mass of the first color particles is larger than a ratio of a charge amount to a mass of the third color particles; the driving method of the electronic paper display device is characterized by comprising the following steps:
applying a first pulse signal to the first electrode in a case where the microcups display a third color; the first pulse signal comprises a preprocessing signal and a first sub-pulse signal which are sequentially applied to the first electrode in a display stage; the pre-processing signal is used for mixing the first color particles and the third color particles and enabling the first color particles and the third color particles to be close to a display side relative to the second color particles; the first sub-pulse signal is used for enabling the third color particles to be close to the display side relative to the first color particles and the second color particles so as to enable the microcups to display a third color.
2. The method of driving an electronic paper display device according to claim 1,
the pre-processing signal comprises a second sub-pulse signal and a third sub-pulse signal, wherein the second sub-pulse signal is applied before the third sub-pulse signal; the second sub-pulse signal is used for making the first color particles to be close to the display side relative to the third color particles, and the third color particles to be close to the display side relative to the second color particles; the effective voltage of the second sub-pulse signal is positive voltage or negative voltage; the third sub-pulse signal is a pulse signal with positive and negative voltages changing alternately, the absolute values of the positive and negative voltages are equal, and the duty ratio of the third sub-pulse signal is 0.5.
3. The method of driving an electronic paper display device according to claim 2,
the first sub-pulse signal comprises at least one pulse repetition unit, each pulse repetition unit comprises a first voltage and a second voltage which are applied in sequence, and the application time of the first voltage is shorter than that of the second voltage; the electrical property of the first voltage is opposite to that of the effective voltage in the second sub-pulse signal, the electrical property of the second voltage is the same as that of the effective voltage in the second sub-pulse signal, and the second voltage is smaller than that of the effective voltage in the second sub-pulse signal.
4. The method of driving an electronic paper display device according to claim 3, wherein each of the pulse repetition units further comprises a zero voltage applied after the second voltage.
5. The method of driving an electronic paper display device according to any one of claims 1 to 4,
in a case where the microcups display a third color, before the first pulse signal is applied to the first electrode, the method of driving the electronic paper display device further includes:
detecting the ambient temperature, and judging whether the detected ambient temperature is within a preset temperature range; and if the environment temperature is within the preset temperature range, applying the first pulse signal to the first electrode.
6. The method of driving an electronic paper display device according to claim 5, wherein the predetermined temperature range is 0 ℃ to 10 ℃.
7. The method of driving an electronic paper display device according to claim 5, further comprising:
if the environment temperature is higher than the maximum temperature in the preset temperature range, applying a second pulse signal to the first electrode; the second pulse signal includes the first sub-pulse signal applied to the first electrode in the display phase.
8. The method of driving an electronic paper display device according to claim 5, wherein the first pulse signal further comprises applying a fourth sub-pulse signal to the first electrode in the display phase; the fourth sub-pulse signal is applied after the first sub-pulse signal, the fourth sub-pulse signal comprises a plurality of pulse units, each pulse unit comprises the first voltage, the second voltage and the zero voltage which are sequentially applied, and the application time of the first voltage is shorter than that of the second voltage;
the application time of the first voltage, the second voltage and the zero voltage in the plurality of pulse units is gradually reduced according to the sequence of the sequential application of the plurality of pulse units.
9. The driving method of the electronic paper display device according to claim 1 or 8, further comprising:
applying a third pulse signal to the first electrode in a case where the microcups display a first color; the third pulse signal is used for enabling the first color particles to be close to the display side of the electronic paper display device relative to the second color particles and the third color particles in the display stage so as to enable the microcups to display the first color;
applying a fourth pulse signal to the first electrode in a case where the microcups display a second color; the fourth pulse signal is used for enabling the second color particles to be close to the display side of the electronic paper display device relative to the first color particles and the third color particles in the display stage, so that the microcups display a second color.
10. The method of driving an electronic paper display device according to claim 9, wherein effective voltages of the third pulse signal and the fourth pulse signal in the display phase are positive voltages or negative voltages; the effective voltages of the third pulse signal and the fourth pulse signal in the display stage are opposite in electrical property;
the display phase comprises a first display phase comprising a first sub-display phase and a second sub-display phase, the first sub-display phase preceding the second sub-display phase; the pulse widths of the third pulse signal and the fourth pulse signal in the first sub-display stage are larger than those in the second sub-display stage; the pulse widths of the first sub-display stages are the same, and the pulse widths of the second sub-display stages are the same.
11. The driving method of the electronic paper display device according to claim 10, wherein the display phase further includes a second display phase located after the first display phase;
the pulse width of the third pulse signal and the fourth pulse signal in the second display phase is smaller than that in the first display phase.
12. The method of driving an electronic paper display device according to claim 10,
in the case of applying the first pulse signal to the first electrode, where the first pulse signal includes the fourth sub-pulse signal, an electrical property of an effective voltage of the first pulse signal in a balance phase is the same as an electrical property of the first voltage; the product of the absolute value of the effective voltage applied by the first pulse signal in the balance phase and the time for applying the effective voltage is equal to the difference between the product of the absolute value of the first voltage and the time for applying the first voltage and the product of the absolute value of the second voltage and the time for applying the second voltage in the first sub-pulse signal and the fourth sub-pulse signal applied in the display phase;
in the case where the third pulse signal and the fourth pulse signal are applied to the first electrode, the electrical property of the effective voltage of each of the third pulse signal and the fourth pulse signal in the equilibrium phase is opposite to the electrical property of the effective voltage in the display phase; the product of the absolute value of the effective voltage applied in the balance phase and the time for applying the effective voltage is equal to the product of the absolute value of the effective voltage applied in the display phase and the time for applying the effective voltage;
wherein the balancing phase precedes the display phase.
13. The method of driving an electronic paper display device according to claim 12, wherein an absolute value of an effective voltage applied in the balance phase is equal to an absolute value of an effective voltage applied in the display phase for each of the third pulse signal and the fourth pulse signal;
the effective voltage applied by the first pulse signal in the balance phase is equal to the first voltage.
14. The method of driving an electronic paper display device according to claim 12 or 13, wherein the first pulse signal, the third pulse signal, and the fourth pulse signal each include a plurality of sub-pulse signals in which positive and negative voltages are alternately changed in a homogenization stage, and pulse widths of the plurality of sub-pulse signals sequentially applied are gradually increased; the duty ratios of the first pulse signal, the third pulse signal and the fourth pulse signal in the homogenization stage are all 0.5;
wherein the homogenization phase precedes the display phase and follows the equilibration phase.
15. The driving method of an electronic paper display device according to claim 8, further comprising:
detecting the brightness value of the third color displayed by the microcups in the display stage for the first time, and judging whether the brightness value displayed by the microcups is greater than or equal to a preset brightness value, if not, increasing the number of the pulse units in the first sub-pulse signal in the display stage to regulate the brightness of the third color for the first time;
performing first detection on the chromatic value of the third color displayed by the microcups in the display stage, and judging whether the chromatic value displayed by the microcups is greater than or equal to a preset chromatic value; if not, increasing the application time of zero voltage in the pulse repeating unit; or, the application time of the second voltage in the pulse unit is increased to perform the first adjustment of the chromaticity of the third color.
16. The method of driving an electronic paper display device according to claim 15, wherein after the first adjustment of the brightness and chromaticity of the third color, the method of driving an electronic paper display device further comprises:
and detecting the brightness value and the chromatic value of the third color displayed by the micro-cup in the display stage for the second time, and judging whether the brightness value displayed by the micro-cup is greater than or equal to the preset brightness value and the chromatic value is greater than or equal to the preset chromatic value, if the brightness value displayed by the micro-cup is less than the preset brightness value and/or the chromatic value displayed by the micro-cup is less than the preset brightness value, adjusting the application time of the second voltage in the pulse unit.
17. The method of driving an electronic paper display device according to claim 14, further comprising:
detecting the brightness values of the first color and the second color displayed by the microcups in the display stage for the first time, and judging whether the brightness values of the first color and the second color displayed by the microcups are greater than or equal to a preset brightness value, if not, increasing the number of pulses or increasing the pulse width of each pulse in the second sub-display stage so as to adjust the brightness of the first color and the second color for the first time;
detecting the chromatic value of the first color displayed by the microcups in the display stage for the first time, judging whether the chromatic value of the first color displayed by the microcups is larger than or equal to a preset chromatic value, if not, in the homogenization stage, prolonging the application time of an effective voltage in the third pulse signal, which is opposite to the electrical property of the effective voltage applied in the display stage, and adjusting the pulse width of the third pulse signal in the second sub-display stage to adjust the chromatic value of the first color for the first time;
and detecting the colorimetric value of the second color displayed by the microcups in the display stage for the first time, judging whether the colorimetric value of the second color displayed by the microcups is greater than or equal to a preset colorimetric value, and if not, increasing the pulse interval time of the fourth pulse signal in the first display stage to adjust the colorimetric value of the second color for the first time.
18. The method of driving an electronic paper display device according to claim 17, wherein after the first adjustment of the brightness and chromaticity of the first color or the second color, the method of driving an electronic paper display device further comprises:
and carrying out second detection on the brightness value and the chromatic value of the first color or the second color displayed by the microcups in the display stage, judging whether the brightness value displayed by the microcups is greater than or equal to the preset brightness value or not, and whether the chromatic value is greater than or equal to the preset chromatic value or not, and if the brightness value displayed by the microcups is less than the preset brightness value and/or the chromatic value displayed by the microcups is less than the preset brightness value, adjusting the pulse width of a pulse signal in the second display stage.
19. An electronic paper display device comprises a plurality of microcups, and a first electrode and a second electrode which are arranged on two opposite sides of each microcup; the microcups comprise first color particles, second color particles and third color particles, the electric charges of the first color particles are opposite to the electric charges of the second color particles, and the electric charges of the first color particles are the same as the electric charges of the third color particles; a ratio of a charge amount to a mass of the first color particles is larger than a ratio of a charge amount to a mass of the third color particles; it is characterized in that the preparation method is characterized in that,
the electronic paper display device further includes: a processor for applying a first pulse signal to the first electrode if the microcups display a third color; the first pulse signal comprises a preprocessing signal and a first sub-pulse signal which are sequentially applied to the first electrode in a display stage; the preprocessing signal is used for mixing the first color particles and the third color particles and enabling the first color particles and the third color particles to be close to the display side of the electronic paper display device relative to the second color particles, and the first sub-pulse signal is used for enabling the third color particles to be close to the display side relative to the first color particles and the second color particles so as to enable the microcups to display a third color.
20. The electronic paper display device of claim 19, further comprising: a temperature sensor for detecting an ambient temperature;
the processor is further used for judging whether the environment temperature detected by the temperature sensor is within a preset temperature range; and if the environment temperature is within the preset temperature range, the processor is used for applying the first pulse signal to the first electrode.
21. The electronic paper display device of claim 20, wherein the processor is configured to apply a second pulse signal to the first electrode if the processor determines that the ambient temperature is greater than a maximum temperature within the preset temperature range; the second pulse signal includes a first sub-pulse signal applied to the first electrode in the display phase.
22. The electronic paper display device of claim 19, wherein the processor is further configured to perform a first detection on a brightness value of the third color displayed by the microcups in a display phase, and determine whether the brightness value displayed by the microcups is greater than or equal to a preset brightness value, if not, in the display phase, the number of the pulse repetition units in the first sub-pulse signal is increased to perform a first adjustment on the brightness of the third color;
performing first detection on the chromatic value of the third color displayed by the microcups in the display stage, and judging whether the chromatic value displayed by the microcups is greater than or equal to a preset chromatic value; if not, increasing the application time of zero voltage in the pulse repeating unit; or increasing the application time of the second voltage in the pulse unit to perform first adjustment on the chromaticity of the third color.
23. The electronic paper display device of claim 22, wherein the processor is further configured to perform a second detection on the brightness and the chromaticity of the third color displayed by the microcups in the display phase after performing the first adjustment on the brightness and the chromaticity of the third color, and determine whether the brightness value displayed by the microcups is greater than or equal to the preset brightness value and the chromaticity value is greater than or equal to the preset chromaticity value, and adjust the application time of the second voltage in the pulse unit if the brightness value displayed by the microcups is less than the preset brightness value and/or the chromaticity value displayed by the microcups is less than the preset brightness value.
24. The electronic paper display device according to claim 19, wherein the processor is further configured to perform a first detection on the brightness values of the first color and the second color displayed by the microcups in the display phase, and determine whether the brightness values of the first color and the second color displayed by the microcups are greater than or equal to a preset brightness value, if not, in a second sub-display phase, the number of pulses is increased, or the pulse width of each pulse is increased, so as to perform a first adjustment on the brightness of the first color and the second color;
detecting the chromatic value of the first color displayed by the microcups in the display stage for the first time, judging whether the chromatic value of the first color displayed by the microcups is larger than or equal to a preset chromatic value, if not, in the homogenization stage, prolonging the application time of effective voltage in the third pulse signals, which is opposite to the electrical property of the effective voltage applied in the display stage, and adjusting the pulse width of the third pulse signals in the second sub-display stage to adjust the chromatic value of the first color for the first time;
and detecting the colorimetric value of the second color displayed by the microcups in the display stage for the first time, judging whether the colorimetric value of the second color displayed by the microcups is greater than or equal to a preset colorimetric value, and if not, increasing the pulse interval of a fourth pulse signal in the first display stage to adjust the colorimetric value of the second color for the first time.
25. The electronic paper display device according to claim 24, wherein the processor is further configured to perform a second detection on the luminance value and the chrominance value of the first color and the second color displayed by the microcups in the display phase after performing a first adjustment on the luminance and the chrominance of the first color or the second color, and determine whether the luminance value displayed by the microcups is greater than or equal to the preset luminance value and the chrominance value is greater than or equal to the preset chrominance value, and adjust a pulse width of the pulse signal in the second display phase if the luminance value displayed by the microcups is less than the preset luminance value and/or the chrominance value displayed by the microcups is less than the preset luminance value.
Technical Field
The invention relates to the technical field of electronic paper display, in particular to an electronic paper display device and a driving method thereof.
Background
Electronic paper (E-paper, also called electronic ink) display devices have attracted attention because of their eye-protecting and power-saving effects.
The electronic paper display device comprises a plurality of microcups, a first electrode and a second electrode, wherein the first electrode and the second electrode are arranged on two opposite sides of each microcup, electrophoretic particles are packaged in each microcup and comprise black particles and red particles which are positively charged and white particles which are negatively charged. The electronic paper display device controls the movement of the electrophoretic particles by controlling the electric field generated by the first electrode and the second electrode, and when the black particles are driven to move to the top end of the microcups by the electric field generated by the first electrode and the second electrode, the microcups display black; when the electric field generated by the first electrode and the second electrode drives the white particles to move to the top of the microcups, the microcups display white; when the electric field generated by the first and second electrodes drives the red particles to move to the top of the microcups, the microcups display red color. Based on this, by controlling the plurality of microcups to display different colors, display can be realized.
Disclosure of Invention
The embodiment of the invention provides an electronic paper display device and a driving method thereof, which can solve the problem of color mixing when a microcup displays a third color at low temperature.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in one aspect, a driving method of an electronic paper display device is provided, the electronic paper display device includes a plurality of microcups and a first electrode and a second electrode disposed at opposite sides of each of the microcups; the microcups comprise first color particles, second color particles and third color particles, the electric charges of the first color particles are opposite to the electric charges of the second color particles, and the electric charges of the first color particles are the same as the electric charges of the third color particles; a ratio of a charge amount to a mass of the first color particles is larger than a ratio of a charge amount to a mass of the third color particles; the driving method of the electronic paper display device includes: applying a first pulse signal to the first electrode in a case where the microcups display a third color; the first pulse signal comprises a preprocessing signal and a first sub-pulse signal which are sequentially applied to the first electrode in a display stage; the pre-processing signal is used to mix the first color particles and the third color particles and to bring the first color particles and the third color particles closer to the display side relative to the second color particles; the first sub-pulse signal is used for enabling the third color particles to be close to the display side relative to the first color particles and the second color particles so as to enable the microcups to display a third color.
In some embodiments, the pre-processed signal comprises a second sub-pulse signal and a third sub-pulse signal, the second sub-pulse signal being applied before the third sub-pulse signal; the second sub-pulse signal is used for making the first color particles to be close to the display side relative to the third color particles, and the third color particles to be close to the display side relative to the second color particles; the effective voltage of the second sub-pulse signal is positive voltage or negative voltage; the third sub-pulse signal is a pulse signal with positive and negative voltages changing alternately, the absolute values of the positive and negative voltages are equal, and the duty ratio of the third sub-pulse signal is 0.5.
In some embodiments, the first sub-pulse signal comprises at least one pulse repetition unit, each pulse repetition unit comprises a first voltage and a second voltage which are applied in sequence, and the application time of the first voltage is less than that of the second voltage; the electrical property of the first voltage is opposite to that of the effective voltage in the second sub-pulse signal, the electrical property of the second voltage is the same as that of the effective voltage in the second sub-pulse signal, and the second voltage is smaller than that of the effective voltage in the second sub-pulse signal.
In some embodiments, each of the pulse repetition units further comprises a zero voltage applied after the second voltage.
In some embodiments, in a case where the microcups display a third color, before the first pulse signal is applied to the first electrode, the method of driving the electronic paper display device further includes: detecting the ambient temperature, and judging whether the detected ambient temperature is within a preset temperature range; and if the environment temperature is within the preset temperature range, applying the first pulse signal to the first electrode.
In some embodiments, the predetermined temperature range is 0 ℃ to 10 ℃.
In some embodiments, the driving method of the electronic paper display device further includes: if the environment temperature is higher than the maximum temperature in the preset temperature range, applying the second pulse signal to the first electrode; the second pulse signal includes the first sub-pulse signal applied to the first electrode in the display phase.
In some embodiments, the first pulse signal further comprises applying the fourth sub-pulse signal to the first electrode during the display phase; the fourth sub-pulse signal is applied after the first sub-pulse signal, the fourth sub-pulse signal comprises a plurality of pulse units, each pulse unit comprises the first voltage, the second voltage and the zero voltage which are sequentially applied, and the application time of the first voltage is shorter than that of the second voltage; the application time of the first voltage, the second voltage and the zero voltage in the plurality of pulse units is gradually reduced according to the sequence of the sequential application of the plurality of pulse units.
In some embodiments, the driving method of the electronic paper display device further includes: applying a third pulse signal to the first electrode in a case where the microcups display a first color; the third pulse signal is used for enabling the first color particles to be close to the display side of the electronic paper display device relative to the second color particles and the third color particles in the display stage so as to enable the microcups to display the first color; applying a fourth pulse signal to the first electrode in a case where the microcups display a second color; the fourth pulse signal is used for enabling the second color particles to be close to the display side of the electronic paper display device relative to the first color particles and the third color particles in the display stage, so that the microcups display a second color.
In some embodiments, the effective voltage of the third pulse signal and the fourth pulse signal in the display phase is a positive voltage or a negative voltage; the effective voltages of the third pulse signal and the fourth pulse signal in the display stage are opposite in electrical property; the display phase comprises a first display phase comprising a first sub-display phase and a second sub-display phase, the first sub-display phase preceding the second sub-display phase; the pulse widths of the third pulse signal and the fourth pulse signal in the first sub-display stage are larger than those in the second sub-display stage; the pulse widths of the first sub-display stages are the same, and the pulse widths of the second sub-display stages are the same.
In some embodiments, the display phases further comprise a second display phase located after the first display phase; the pulse width of the third pulse signal and the fourth pulse signal in the second display phase is smaller than that in the first display phase.
In some embodiments, in a case where the first pulse signal including the fourth sub-pulse signal is applied to the first electrode, an electrical property of an effective voltage of the first pulse signal in a balance phase is the same as an electrical property of the first voltage; the product of the absolute value of the effective voltage applied by the first pulse signal in the balance phase and the time for applying the effective voltage is equal to the difference between the product of the absolute value of the first voltage and the time for applying the first voltage and the product of the absolute value of the second voltage and the time for applying the second voltage in the first sub-pulse signal and the fourth sub-pulse signal applied in the display phase; in the case where the third pulse signal and the fourth pulse signal are applied to the first electrode, the electrical property of the effective voltage of each of the third pulse signal and the fourth pulse signal in the equilibrium phase is opposite to the electrical property of the effective voltage in the display phase; the product of the absolute value of the effective voltage applied in the balance phase and the time for applying the effective voltage is equal to the product of the absolute value of the effective voltage applied in the display phase and the time for applying the effective voltage; wherein the balancing phase precedes the display phase.
In some embodiments, the absolute value of the effective voltage applied in the balance phase by each of the third pulse signal and the fourth pulse signal is equal to the absolute value of the effective voltage applied in the display phase; the effective voltage applied by the first pulse signal in the balance phase is equal to the first voltage.
In some embodiments, the first pulse signal, the third pulse signal and the fourth pulse signal each include a plurality of sub-pulse signals with alternating positive and negative voltages in a homogenization phase, and pulse widths of the plurality of sub-pulse signals applied in sequence gradually increase; the duty ratios of the first pulse signal, the third pulse signal and the fourth pulse signal in the homogenization stage are all 0.5; wherein the homogenization phase precedes the display phase and follows the equilibration phase.
In some embodiments, the driving method of the electronic paper display device further includes: detecting the brightness value of the third color displayed by the microcups in the display stage for the first time, and judging whether the brightness value displayed by the microcups is greater than or equal to a preset brightness value, if not, increasing the number of the pulse repetition units in the first sub-pulse signal in the display stage to adjust the brightness of the third color for the first time; performing first detection on the chromatic value of the third color displayed by the microcups in the display stage, and judging whether the chromatic value displayed by the microcups is greater than or equal to a preset chromatic value; if not, increasing the application time of zero voltage in the pulse repeating unit; or, the application time of the second voltage in the pulse unit is increased to perform the first adjustment of the chromaticity of the third color.
In some embodiments, after the first adjusting of the brightness and the chromaticity of the third color, the driving method of the electronic paper display device further includes: and detecting the brightness value and the chromatic value of the third color displayed by the micro-cup in the display stage for the second time, and judging whether the brightness value displayed by the micro-cup is greater than or equal to the preset brightness value and the chromatic value is greater than or equal to the preset chromatic value, if the brightness value displayed by the micro-cup is less than the preset brightness value and/or the chromatic value displayed by the micro-cup is less than the preset brightness value, adjusting the application time of the second voltage in the pulse unit.
In some embodiments, the driving method of the electronic paper display device further includes: detecting the brightness values of the first color and the second color displayed by the microcups in the display stage for the first time, and judging whether the brightness values of the first color and the second color displayed by the microcups are greater than or equal to a preset brightness value, if not, increasing the number of pulses in the second sub-display stage; or increasing the pulse width of each pulse to perform first adjustment on the brightness of the first color and the second color; detecting the chromatic value of the first color displayed by the microcups in the display stage for the first time, judging whether the chromatic value of the first color displayed by the microcups is larger than or equal to a preset chromatic value, if not, in the homogenization stage, prolonging the application time of an effective voltage in the third pulse signal, which is opposite to the electrical property of the effective voltage applied in the display stage, and adjusting the pulse width of the third pulse signal in the second sub-display stage to adjust the chromatic value of the first color for the first time; and detecting the colorimetric value of the second color displayed by the microcups in the display stage for the first time, judging whether the colorimetric value of the second color displayed by the microcups is greater than or equal to a preset colorimetric value, and if not, increasing the pulse interval time of the fourth pulse signal in the first display stage to adjust the colorimetric value of the second color for the first time.
In some embodiments, after the first adjusting of the brightness and chromaticity of the first color or the second color, the driving method of the electronic paper display device further includes: and performing second detection on the brightness value and the chromatic value of the first color or the second color displayed by the microcups in the display stage, and judging whether the brightness value displayed by the microcups is greater than or equal to the preset brightness value and whether the chromatic value is greater than or equal to the preset chromatic value, and if the brightness value displayed by the microcups is less than the preset brightness value and/or the chromatic value displayed by the microcups is less than the preset brightness value, adjusting the pulse width of a pulse signal in the second display stage.
In another aspect, an electronic paper display device is provided, including a plurality of microcups, and a first electrode and a second electrode disposed at opposite sides of each of the microcups; the microcups comprise first color particles, second color particles and third color particles, the electric charges of the first color particles are opposite to the electric charges of the second color particles, and the electric charges of the first color particles are the same as the electric charges of the third color particles; a ratio of a charge amount to a mass of the first color particles is larger than a ratio of a charge amount to a mass of the third color particles; the electronic paper display device further includes: a processor for applying a first pulse signal to the first electrode if the microcups display a third color; the first pulse signal comprises a preprocessing signal and a first sub-pulse signal which are sequentially applied to the first electrode in a display stage; the preprocessing signal is used for mixing the first color particles and the third color particles and enabling the first color particles and the third color particles to be close to the display side of the electronic paper display device relative to the second color particles, and the first sub-pulse signal is used for enabling the third color particles to be close to the display side relative to the first color particles and the second color particles so as to enable the microcups to display a third color.
In some embodiments, the electronic paper display device further comprises: a temperature sensor for detecting an ambient temperature; the processor is further used for judging whether the environment temperature detected by the temperature sensor is within a preset temperature range; and if the environment temperature is within the preset temperature range, the processor is used for applying the first pulse signal to the first electrode.
In some embodiments, if the processor determines that the ambient temperature is greater than the maximum temperature within the preset temperature range, the processor is configured to apply the second pulse signal to the first electrode; the second pulse signal includes a first sub-pulse signal applied to the first electrode in the display phase.
In some embodiments, the processor is further configured to perform a first detection on a brightness value of the third color displayed by the microcups in the display phase, and determine whether the brightness value displayed by the microcups is greater than or equal to a preset brightness value, if not, in the display phase, the number of the pulse repetition units in the first sub-pulse signal is increased to perform a first adjustment on the brightness of the third color; performing first detection on the chromatic value of the third color displayed by the microcups in the display stage, and judging whether the chromatic value displayed by the microcups is greater than or equal to a preset chromatic value; if not, increasing the application time of zero voltage in the pulse repeating unit; or, the application time of the second voltage in the pulse unit is increased to perform the first adjustment of the chromaticity of the third color.
In some embodiments, the processor is further configured to perform a second detection on the luminance and the chromaticity of the third color displayed by the micro-cup in the display stage after performing the first adjustment on the luminance and the chromaticity of the third color, and determine whether the luminance value displayed by the micro-cup is greater than or equal to the preset luminance value and the chromaticity value is greater than or equal to the preset chromaticity value, and adjust the application time of the second voltage in the pulse unit if the luminance value displayed by the micro-cup is less than the preset luminance value and/or the chromaticity value displayed by the micro-cup is less than the preset luminance value.
In some embodiments, the processor is further configured to perform a first detection on the brightness values of the first color and the second color displayed by the microcups in the display stage, and determine whether the brightness values of the first color and the second color displayed by the microcups are greater than or equal to a preset brightness value, if not, increase the number of pulses in the second sub-display stage; or increasing the pulse width of each pulse to perform first adjustment on the brightness of the first color and the second color; detecting the chromatic value of the first color displayed by the microcups in the display stage for the first time, judging whether the chromatic value of the first color displayed by the microcups is larger than or equal to a preset chromatic value, if not, in the homogenization stage, prolonging the application time of an effective voltage in the third pulse signal, which is opposite to the electrical property of the effective voltage applied in the display stage, and adjusting the pulse width of the third pulse signal in the second sub-display stage to adjust the chromatic value of the first color for the first time; and detecting the chromatic value of the second color displayed by the microcups in the display stage for the first time, judging whether the chromatic value of the second color displayed by the microcups is greater than or equal to a preset chromatic value, and if not, increasing the pulse interval of the fourth pulse signal in the first display stage to adjust the chromatic value of the second color for the first time.
In some embodiments, the processor is further configured to perform a second detection on the luminance value and the chrominance value of the first color and the second color displayed by the microcups in the display phase after performing a first adjustment on the luminance and the chrominance of the first color or the second color, and determine whether the luminance value displayed by the microcups is greater than or equal to the preset luminance value and the chrominance value is greater than or equal to the preset chrominance value, and adjust the pulse width of the pulse signal in the second display phase if the luminance value displayed by the microcups is less than the preset luminance value and/or the chrominance value displayed by the microcups is less than the preset luminance value.
The embodiment of the invention provides an electronic paper display device and a driving method thereof, wherein the electronic paper display device comprises the following steps: applying a first pulse signal to the first electrode in a case where the microcups display a third color; the first pulse signal comprises a preprocessing signal and a first sub-pulse signal which are sequentially applied to the first electrode in a display stage; the preprocessing signal is used for mixing the first color particles and the third color particles, and enabling the first color particles and the third color particles to be close to the display side of the electronic display device relative to the second color particles; the first sub-pulse signal is used for enabling the third color particles to be close to the display side of the electronic paper display device relative to the first color particles so as to enable the microcups to display the third color. In the case that the microcups display the third color, since the first pulse signal includes a pre-processing signal in addition to the first sub-pulse signal, the pre-processing signal may mix the first color particles and the third color particles together, and the first color particles and the third color particles are close to the display side of the electronic display device with respect to the second color particles; after the first sub-pulse signal is applied again, the third color particles can be close to the display side of the electronic display device relative to the first color particles by the first sub-pulse signal, so that the micro-cups can be ensured not to be mixed when displaying the third color, and particularly, the micro-cups can not be mixed when displaying the third color at low temperature.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a first schematic structural diagram of an electronic paper display device according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a driving method of an electronic paper display device according to an embodiment of the present invention;
fig. 3 is a first schematic diagram illustrating a waveform of a first pulse signal according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a waveform of a second pulse signal provided in the related art;
fig. 5 is a second schematic diagram illustrating a waveform of a first pulse signal according to an embodiment of the present invention;
fig. 6 is a third schematic diagram illustrating a waveform of a first pulse signal according to an embodiment of the present invention;
fig. 7 is a first schematic diagram illustrating waveforms of a first pulse signal, a third pulse signal and a fourth pulse signal according to an embodiment of the present invention;
fig. 8 is a second schematic diagram illustrating waveforms of a first pulse signal, a third pulse signal and a fourth pulse signal according to an embodiment of the present invention;
fig. 9 is a third schematic diagram illustrating waveforms of a first pulse signal, a third pulse signal and a fourth pulse signal according to an embodiment of the present invention;
fig. 10 is a fourth schematic diagram illustrating waveforms of a first pulse signal, a third pulse signal and a fourth pulse signal according to an embodiment of the present invention;
fig. 11 is a schematic flowchart of a debugging pulse signal waveform according to an embodiment of the present invention;
fig. 12 is a second schematic structural diagram of an electronic paper display device according to an embodiment of the present invention;
fig. 13 is a third schematic structural diagram of an electronic paper display device according to an embodiment of the present invention.
Reference numerals:
01-a first pulse signal; 02-second pulse signal; 03-a third pulse signal; 04-fourth pulse signal; 011-preprocessing the signal; 012-a first sub-pulse signal; 013 — a second sub-pulse signal; 014 — third sub-pulse signal; 015-fourth sub-pulse signal; 1-an electronic paper display device; 10-micro cup; 11-a first electrode; 12-a second electrode; 20-a pulse repetition unit; 30-a pulse unit; 40-sub-pulse signal; 50-a processor; 60-a temperature sensor; 101-first color particles; 102-second color particles; 103-third color particles.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a driving method of an electronic paper display device, as shown in fig. 1, the electronic
Here, the positions where the
On this basis, it should be understood that the electrode close to the display side of the electronic
In addition, the
The electrical property of the charges of the
In the present embodiment, the colors of the
It will be understood by those skilled in the art that the
The embodiment of the invention provides a driving method of an electronic paper display device, which is used for driving the electronic
s100, applying a
In the embodiment of the present invention, in the case where the
When the
In the case where the micro-cup 10 displays the third color, the driving method of the electronic
The embodiment of the invention provides a driving method of an electronic
The preprocessed
It should be understood that, after the second
The effective voltage of the second
In the case where the
In some embodiments, the absolute value of the effective voltage of the second
The first
Here, the first
The effective voltage, the first voltage V1, and the second voltage V2 in the second
The second
Since the
The time of the zero voltage applied after the second voltage V2 is not limited and may be set as needed. In some embodiments, the application time of the zero voltage is less than the application time of the first voltage V1.
In the embodiment of the present invention, since the
Alternatively, in case the
Before the
detecting the ambient temperature, and judging whether the detected ambient temperature is within a preset temperature range; if the ambient temperature is within the preset temperature range, the
Here, the preset temperature range is not limited, and in some embodiments, the preset temperature range is 0 ℃ to 10 ℃.
Since the activity of the
Considering that when the ambient temperature is high, that is, the ambient temperature is higher than the maximum temperature in the preset temperature range, the electric field generated by the
The
Alternatively, as shown in fig. 6, the
Based on the above, the
It is considered that, if a voltage is not applied to the
Alternatively, as shown in fig. 7, in the case where the
When the
When the
Alternatively, as shown in fig. 7, the effective voltage of the
Here, the effective voltage of the
Taking the example that the
The magnitude of the effective voltage of the
Since the pulse widths L of the
Optionally, as shown in fig. 8, the display phase T1 further includes a second display phase T12 following the first display phase T11; the pulse width L of the
It is considered that, after the first display period T11, if no voltage is applied to the
In some embodiments, the
Alternatively, as shown in fig. 9, the balance phase T2 is before the display phase T1, and in the case that the
Since the
In the case where the first voltage V1 is a positive voltage, the effective voltage of the
In the embodiment of the present invention, the balancing phase T2 is added before the display phase T1, and the product of the absolute value of the effective voltage applied in the balancing phase T2 and the time of applying the effective voltage of the
Here, the effective voltage applied by the
In the embodiment of the present invention, the effective voltage applied by the
In the case where the
In the case where the effective voltage of the
In the embodiment of the present invention, the balance stage T2 is added before the display stage T1, and the product of the absolute value of the effective voltage applied in the balance stage T2 by the
Here, the absolute values of the effective voltages of the
In the embodiment of the present invention, the absolute value of the effective voltage applied by the
Alternatively, as shown in fig. 10, the homogenization phase (Shaking) T3 is before the display phase T1, after the balance phase T2, the
Here, the number of the sub-pulse signals 40 included in the equalization stage T3 in the
In addition, the pulse width L of the pulse in each
In the embodiment of the present invention, before the display stage T1, the equalization stage T3 is added after the balance stage T2, and the
Based on the above, the waveforms of the
Optionally, the driving method of the electronic
the brightness value of the third color displayed by the
Performing first detection on a chromatic value of a third color displayed by the micro-cup 10 in the display stage T1, and determining whether the chromatic value displayed by the micro-cup 10 is greater than or equal to a preset chromatic value; if not, increasing the application time of the zero voltage in the
Here, if it is determined that the brightness value of the third color displayed by the
In addition, the
It should be understood that if it is determined that the luminance value of the third color displayed by the micro-cup 10 in the display period T1 is greater than or equal to the preset luminance value and the chromaticity value of the displayed third color is greater than or equal to the preset chromaticity value, the
The electronic
On this basis, it may be determined whether the luminance value of the third color displayed by the micro-cup 10 in the display stage T1 is greater than or equal to the preset luminance value, and the
In the embodiment of the present invention, since the
Considering that the brightness value and the chromaticity value of the third color displayed by the
the luminance value and the chrominance value of the third color displayed by the micro-cup 10 in the display stage T1 are detected for the second time, and it is determined whether the luminance value displayed by the micro-cup 10 is greater than or equal to the preset luminance value and the chrominance value is greater than or equal to the preset chrominance value, if the luminance value displayed by the micro-cup 10 is less than the preset luminance value and/or the chrominance value displayed by the micro-cup 10 is less than the preset luminance value, the application time of the second voltage V2 in the
Optionally, the driving method of the electronic
the brightness values of the first color and the second color displayed by the micro-cup 10 in the display stage T1 are detected for the first time, and whether the brightness values of the first color and the second color displayed by the micro-cup 10 are greater than or equal to the preset brightness value is determined, if not, in the second sub-display stage T2, the number of pulses is increased, or the pulse width L of each pulse is increased, so as to adjust the brightness of the first color and the second color for the first time.
The chromaticity value of the first color displayed by the micro-cup 10 in the display stage T1 is detected for the first time, and whether the chromaticity value of the first color displayed by the micro-cup 10 is greater than or equal to the preset chromaticity value is determined, if not, in the uniformization stage T3, the application time of the effective voltage of the
The chromaticity value of the second color displayed by the
The pulse interval time of the first display period T1 is the time when the voltage applied in the
Here, when the luminance value of the first color or the second color displayed in the display period T1 of the micro-cup 10 is less than the preset luminance value, the number of pulses added in the second sub-display period T2 is not limited, and one pulse may be added according to the display effect; two or more pulses may be added. The pulse width L of each pulse increment in the second sub-display period t2 is not limited and may be set accordingly according to the display effect.
In addition, the pulse width L of the
The
It should be understood that if it is determined that the luminance values of the first color and the second color displayed by the micro-cup 10 in the display period T1 are greater than or equal to the preset luminance values, and the chrominance values of the displayed first color and the displayed second color are greater than or equal to the preset chrominance values, the
The electronic
On this basis, it may be determined whether the luminance value of the first color (or the second color) displayed by the micro-cup 10 in the display stage T1 is greater than or equal to the preset luminance value, and the third pulse signal 03 (or the fourth pulse signal 04) is adjusted, and then it may be determined whether the chromaticity value of the first color (or the second color) displayed by the micro-cup 10 in the display stage T1 is greater than or equal to the preset chromaticity value, and the third pulse signal 03 (or the fourth pulse signal 04) is adjusted; or first determining whether the chromaticity value of the first color (or the second color) displayed by the micro-cup 10 in the display period T1 is greater than or equal to a preset chromaticity value, and adjusting the third pulse signal 03 (or the fourth pulse signal 04), and then determining whether the brightness value of the first color (or the second color) displayed by the micro-cup 10 in the display period T1 is greater than or equal to a preset brightness value, and adjusting the third pulse signal 03 (or the fourth pulse signal 04); of course, it is also possible to simultaneously determine the brightness value of the first color (or the second color) displayed by the micro-cup 10 in the display period T1, the preset brightness value, and the preset chromatic value, and adjust the third pulse signal 03 (or the fourth pulse signal 04).
In the embodiment of the invention, the brightness of the first color or the second color displayed by the
Considering that the brightness value and the chromaticity value of the first color or the second color displayed by the
and performing second detection on the brightness value and the chroma value of the first color or the second color displayed by the micro-cup 10 in the display stage T1, and determining whether the brightness value displayed by the micro-cup 10 is greater than or equal to the preset brightness value and the chroma value is greater than or equal to the preset chroma value, and if the brightness value displayed by the micro-cup 10 is less than the preset brightness value and/or the chroma value displayed by the micro-cup is less than the preset brightness value, adjusting the pulse width of the pulse signal in the second display stage T12.
Here, in the case where the
Based on the above, the order of detecting the luminance and chromaticity of the first color, the second color, and the third color and adjusting the corresponding pulse signals is not limited. A detailed description is provided below of a specific example. The first color is black, the second color is white, and the third color is red. As shown in fig. 11, in the first step, the luminance value of red is detected, and the waveform of the
Based on the above, as shown in fig. 12, the electronic paper display device further includes a
Optionally, as shown in fig. 13, the electronic paper display device further includes: a
Optionally, if the
Optionally, the
Optionally, the
Optionally, the
Optionally, the
For the explanation of the
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
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