CN-122024659-A - Driving method and driving chip of electronic paper display screen and electronic paper display

Abstract

The invention provides a driving method of an electronic paper display screen, a driving chip and an electronic paper display, wherein the driving method comprises the steps of obtaining display content of pixels in a current frame; the method comprises the steps of judging whether display contents of pixels in a current frame are identical to display contents of pixels in a previous frame or not, acquiring a frame number M for continuously displaying the same contents by the pixels in the current frame if the display contents of the pixels in the current frame are identical to the display contents of the pixels in the previous frame, and configuring a driving voltage applied to a pixel electrode in the current frame to be identical to a driving voltage applied to the pixel electrode in the previous frame if M=2, wherein the driving voltage applied to the pixel electrode in the previous frame is a first refreshing voltage, and the first refreshing voltage is different from a common voltage. According to the driving method of the electronic paper display screen, the difference between black colors displayed by different pixels is reduced, and the difference between white colors displayed by different pixels is reduced, so that the afterimage degree of the electronic paper display screen during display is reduced.

Inventors

• LV BOJIA
• GUO WANLONG
• FU JUJIAN
• DING YUAN
• HUA JINHUI
• CHENG WEI

Assignees

• 上海天马微电子有限公司

Dates

Publication Date

20260512

Application Date

20260331

Claims (20)

1. 1. The driving method of the electronic paper display screen comprises a plurality of pixels, wherein the pixels comprise pixel electrodes and common electrodes, the pixel electrodes are arranged opposite to the common electrodes, and the common electrodes have a common voltage, and the driving method is characterized by comprising the following steps: acquiring the display content of the pixel in the current frame; judging whether the display content of the pixel in the current frame is the same as the display content of the pixel in the previous frame; if the display content of the pixel in the current frame is the same as the display content of the previous frame, acquiring a frame number M for stopping the continuous display of the same content by the pixel in the current frame; if m=2, the driving voltage applied to the pixel electrode at the current frame is configured to be the same as the driving voltage applied at the previous frame; Wherein the driving voltage applied to the pixel electrode in the previous frame is a first refresh voltage, which is different from the common voltage.
2. 2. The driving method according to claim 1, further comprising, after acquiring a frame number M that cuts off the pixel of the current frame from continuously displaying the same content: if M is smaller than N, the driving voltage applied to the pixel electrode in the current frame is configured to be the first refresh voltage, and N is a positive integer greater than 2.
3. 3. The driving method according to claim 1, wherein after judging whether or not the display content of the pixel in the current frame is identical to the display content of the previous frame, further comprising: And if the display content of the pixel in the current frame is different from the display content of the pixel in the previous frame, changing the driving voltage applied to the pixel electrode to be a second refreshing voltage according to the display content of the pixel in the current frame, wherein the second refreshing voltage is different from the first refreshing voltage, and the second refreshing voltage is different from the common voltage.
4. 4. A driving method according to claim 3, wherein the absolute value of the first refresh voltage is greater than the absolute value of the common voltage, and the absolute value of the second refresh voltage is greater than the absolute value of the common voltage.
5. 5. A driving method according to claim 3, wherein the first refresh voltage is equivalently inverted from the second refresh voltage.
6. 6. The driving method according to claim 2, wherein N > F x T; And F is the refresh rate of the electronic paper display screen, the refresh rate is the number of refresh display images in each second of the electronic paper display screen, T is the response time of the electronic paper display screen, and the response time is the time required by the pixels to be switched from one optical limit state to the other optical limit state.
7. 7. The driving method according to claim 2, wherein N < P, P being the minimum number of frames for which the pixels continuously display the same content resulting in polarization of the material, P being a positive integer.
8. 8. The driving method according to claim 2, further comprising, after acquiring a frame number M that cuts off the pixel of the current frame from continuously displaying the same content: and if M is equal to N, configuring the driving voltage applied to the pixel electrode by the current frame as the common voltage.
9. 9. The driving method according to claim 2, further comprising, after acquiring a frame number M that cuts off the pixel of the current frame from continuously displaying the same content: If M is greater than N, the common voltage is applied to the pixel electrode in the N frame, and the first refresh voltage is applied to the pixel electrode in at least one frame after the N frame.
10. 10. The driving method according to claim 9, wherein in at least one frame after the nth frame, the driving voltage applied to the pixel electrode satisfies: After every i frames of applying the common voltage to the pixel electrode, a frame of applying the first refresh voltage to the pixel electrode is set, i being a positive integer.
11. 11. The driving method according to claim 1, wherein the display content is in two optical limit states, the two optical limit states including a black state and a white state.
12. 12. The driving method according to claim 1, wherein F is a refresh rate of the electronic paper display screen, the refresh rate being a number of refresh display images per second of the electronic paper display screen, and F is equal to or greater than 5 hz.
13. 13. The driving method according to claim 1, wherein the step of acquiring the number of frames M that stop the pixels of the current frame from continuously displaying the same content, comprises: And adding 1 on the basis of the frame number of the pixels of the previous frame continuously displaying the same content, and obtaining an updated frame number M.
14. 14. The driving method according to claim 1, wherein before determining whether the display content of the pixel in the current frame is identical to the display content in the previous frame, further comprising: judging whether the current frame is a first frame after the screen is lightened; The step of judging whether the display content of the pixel in the current frame is the same as the display content of the pixel in the previous frame comprises the following steps: And if the current frame is not the first frame after the screen is lightened, judging whether the display content of the pixel in the current frame is the same as the display content of the pixel in the previous frame.
15. 15. The driving method according to claim 14, further comprising, after determining whether the current frame is a first frame after lighting a screen: And if the current frame is the first frame after the screen is lightened, configuring the driving voltage applied to the pixel electrode according to the display content of the pixel in the current frame.
16. 16. The driving method according to claim 2, wherein the value of N transitions the brightness of the pixel from a non-saturated region to a saturated region.
17. 17. The driving method according to claim 1, wherein the driving method is performed for each of the pixels.
18. 18. The driving method according to claim 17, wherein if the image of the current frame is identical to the image of the previous frame, a driving voltage applied to at least one of the pixel electrodes at the current frame is configured to be identical to a driving voltage applied at the previous frame.
19. 19. A driver chip comprising processing circuitry configured to perform the driving method of any of claims 1-18.
20. 20. An electronic paper display comprising an electronic paper display screen and a drive circuit configured to perform the drive method of any of claims 1-18.

Description

Driving method and driving chip of electronic paper display screen and electronic paper display Technical Field The present invention relates to the field of display technologies, and in particular, to a driving method and a driving chip for an electronic paper display screen, and an electronic paper display. Background Electronic paper display technology originated in the 70 s of the 20 th century, with the core goal of simulating the reading experience of traditional paper. In 1974, the schlempe research center first proposed the concept of electronic paper, using the principle of display of electrophoretic particle suspensions. In 1997, the media laboratory of the Ma province institute of technology and the E-Ink company cooperate to develop an electrophoretic display technology, and bistable display is realized by encapsulating electrophoretic particles through microcapsules, so that the technical foundation of modern electronic paper is laid. The electronic paper only consumes power when refreshed, and the technology has the characteristics of ultra-low power consumption, sunlight visibility, no backlight flickering and the like, and solves the problem of visual fatigue of the traditional LCD screen. Along with technology iteration, innovations such as flexible substrates, color filters, local refreshing and the like are continuously emerging, and application scenes are expanded to the fields of electronic tags, intelligent wearing, digital signage and the like. Under the carbon neutralization background, the electronic paper is an important display solution in the Internet of things era by virtue of the characteristics of energy conservation, environmental protection and reusability, for example, a single electronic price tag can last for 5-7 years. Disclosure of Invention The invention provides a driving method, a driving chip and an electronic paper display for reducing the difference between black colors displayed by different pixels and the difference between white colors displayed by different pixels, thereby reducing the afterimage degree of the electronic paper display during display. In a first aspect, an embodiment of the present invention provides a driving method of an electronic paper display screen, where the electronic paper display screen includes a plurality of pixels, the pixels include a pixel electrode and a common electrode, the pixel electrode is disposed opposite to the common electrode, and the common electrode has a common voltage, and the driving method includes: acquiring the display content of the pixel in the current frame; judging whether the display content of the pixel in the current frame is the same as the display content of the pixel in the previous frame; if the display content of the pixel in the current frame is the same as the display content of the previous frame, acquiring a frame number M for stopping the continuous display of the same content by the pixel in the current frame; if m=2, the driving voltage applied to the pixel electrode at the current frame is configured to be the same as the driving voltage applied at the previous frame; Wherein the driving voltage applied to the pixel electrode in the previous frame is a first refresh voltage, which is different from the common voltage. In a second aspect, an embodiment of the present invention provides a driving chip, including a processing circuit configured to perform the driving method according to the first aspect. In a third aspect, an embodiment of the present invention provides an electronic paper display, including an electronic paper display screen and a driving circuit configured to perform the driving method according to the first aspect. In the driving method of the electronic paper display screen provided by the embodiment of the invention, the first refreshing voltage is applied to the pixel electrode in the previous frame, if the display content of the pixel in the current frame is the same as the display content of the previous frame, the first refreshing voltage is also applied to the pixel in the current frame if the pixel is the second frame with the same content continuously displayed by the pixel, the first refreshing voltage is different from the common voltage, and an electric field in the same direction as the previous frame exists between the pixel electrode and the common electrode in the current frame, so that enough movement time is given to the electrophoretic particles when the pixel displays the same content, enough brightness change time is given to the pixel, and the brightness of the pixel is closer to the saturation region. The blackness of each pixel of the electronic paper display screen is closer, the whiteness of each pixel is closer, the difference between the black colors of different pixels is reduced, and the difference between the white colors of different pixels is reduced, so that the afterimage degree of the electronic paper display screen during display is reduc