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CN-121982995-A - Electronic paper driving method and device

CN121982995ACN 121982995 ACN121982995 ACN 121982995ACN-121982995-A

Abstract

The application discloses an electronic paper driving method and device, which comprise the steps of obtaining N-th frame image data and N+1-th frame image data to be displayed, judging whether a target display state of a target pixel in the N-th frame is a first gray level or a second gray level according to the N-th frame image data, judging whether the target display state of the target pixel in the N+1-th frame is the first gray level or the second gray level according to the N-th frame image data, generating and applying a first driving time sequence to the target pixel according to the target display state of the target pixel in the N-th frame when the N-th frame is refreshed, wherein the first driving time sequence comprises a first polarity voltage for driving display, and generating and applying a second driving time sequence to the target pixel according to the target display state of the target pixel in the N+1-th frame when the N+1-th frame is refreshed, wherein the second driving time sequence comprises a second polarity voltage for driving display. The method and the device effectively reduce the time required by refreshing a single picture and improve the refreshing speed of the electronic paper.

Inventors

  • LI SONGGUI

Assignees

  • 安徽煜图科技有限公司

Dates

Publication Date
20260505
Application Date
20260114

Claims (10)

  1. 1. The electronic paper driving method is characterized by comprising the following steps of: Acquiring N frame image data and N+1 frame image data to be displayed; judging whether the target display state of the target pixel in the N frame is a first gray level or a second gray level according to the N frame image data; judging whether the target display state of the target pixel in the (N+1) th frame is the first gray scale or the second gray scale according to the (N+1) th frame image data; When refreshing the N frame, generating and applying a first driving time sequence to the target pixel according to the target display state of the target pixel in the N frame, wherein the first driving time sequence comprises a first polarity voltage for driving display; Generating and applying a second driving time sequence to the target pixel according to the target display state of the target pixel in the (N+1) th frame when the (N+1) th frame is refreshed, wherein the second driving time sequence comprises a second polarity voltage for driving display; wherein the first driving timing and the second driving timing are configured such that, for the same target pixel, a balance voltage for preventing polarization of liquid crystal is applied only once during refresh of the nth frame and the n+1th frame when a first gray scale is continuously displayed or a second gray scale is continuously displayed.
  2. 2. The method according to claim 1, wherein the first driving timing omits application of a first type of balance voltage corresponding to a first gray scale when the target display state of the target pixel in the N-th frame is the first gray scale, and wherein the second driving timing applies the first type of balance voltage when the target display state of the target pixel in the n+1-th frame is the first gray scale.
  3. 3. The method according to claim 1, wherein the first driving timing applies a second type of balance voltage corresponding to a second gray level when the target pixel is in the second gray level in the target display state of the N-th frame, and wherein the second driving timing omits the application of the second type of balance voltage when the target pixel is in the second gray level in the target display state of the n+1-th frame.
  4. 4. The electronic paper driving method according to claim 2, wherein the first gray level is white, and the polarity of the first type of balance voltage is opposite to the polarity of the voltage for driving the display of white.
  5. 5. The electronic paper driving method according to claim 2, wherein the absolute value of the magnitude of the first type of balance voltage is equal to the absolute value of the magnitude of the voltage for driving the display white.
  6. 6. The electronic paper driving method according to claim 3, wherein the second gray level is black, and the polarity of the second type of balance voltage is opposite to the polarity of the voltage for driving display of black.
  7. 7. The electronic paper driving method according to claim 3, wherein the absolute value of the amplitude of the second type of balance voltage is equal to the absolute value of the amplitude of the voltage for driving display black.
  8. 8. An electronic paper driving device, comprising: The image data acquisition module is used for receiving and caching continuous N-th frame image data and N+1-th frame image data; The pixel state judging module is used for judging the target display state of the target pixel in two continuous frames according to the N-th frame image data and the (n+1) -th frame image data; the time sequence control module is used for generating a first driving time sequence control signal according to the target display state of the target pixel in the N frame and generating a second driving time sequence control signal according to the target display state of the target pixel in the (n+1) frame; the grid driving module is used for responding to the first driving time sequence control signal or the second driving time sequence control signal and gating pixel rows on the display panel row by row; A source driving module for applying a corresponding driving voltage to a target pixel in the pixel row being strobed in response to the first driving timing control signal or the second driving timing control signal; the timing control module is configured to control the source driving module to apply a balance voltage for preventing polarization of liquid crystal to the target pixel only once in a refresh process of an nth frame and an n+1th frame when the output of the pixel state judging module indicates that the target pixel displays the same gray scale in two consecutive frames.
  9. 9. The electronic paper driving apparatus according to claim 8, wherein the timing control module is further configured to: When the target display state of the target pixel in the N frame is a first gray scale, the first driving time sequence control signal is controlled to not contain a first type of balance voltage instruction corresponding to the first gray scale; when the target display state of the target pixel in the n+1th frame is the first gray scale, the second driving timing control signal is controlled to include a first type of balance voltage command.
  10. 10. The electronic paper driving apparatus according to claim 9, wherein the timing control module is further configured to: When the target display state of the target pixel in the N frame is the second gray level, controlling the first driving time sequence control signal to contain a second class of balance voltage instruction corresponding to the second gray level; when the target display state of the target pixel in the n+1th frame is the second gray scale, the second driving time sequence control signal is controlled to not contain the second class balance voltage command.

Description

Electronic paper driving method and device Technical Field The present invention relates to the field of display technologies, and in particular, to a method and an apparatus for driving electronic paper. Background Electronic paper display panels are typically composed of millions of microcapsule or microcup structures in which charged pigment particles and a dispersion medium are encapsulated. Under the action of an external electric field, particles with different electrical properties move directionally, so that the bright and dark (such as black and white) display of the pixel point is realized. The core for driving the display panel is a thin film transistor TFT array substrate and a driving circuit matched with the thin film transistor TFT array substrate. The typical driving process adopts a progressive scanning mode, wherein a grid electrode GATE driving circuit sequentially outputs an opening voltage to each row of scanning lines to turn on TFT switches of the row by row, and meanwhile, a SOURCE electrode SOURCE driving circuit applies a driving voltage with specific polarity and amplitude to each pixel unit of the opened row through a data line according to display data, and the voltage charges a pixel capacitor, so that an electric field for driving pigment particles to move is formed in the pixel unit, and the display state of the pixels of the row is updated. This process proceeds line by line until the entire picture refresh is completed. To ensure long life and display stability of electronic paper, it is necessary to avoid irreversible polarization or afterimage phenomena of liquid crystal or electrophoretic materials due to long-term exposure to the direct current component of unidirectional electric field. For this reason, a strategy called ac drive or voltage balancing is commonly employed in the art. Specifically, when refreshing a single screen, the driving circuit applies a main driving voltage pulse for achieving a target gray level, regardless of whether the target display state is white (W) or black (B), and then typically applies a balance voltage pulse of opposite polarity and equal or similar duration. As shown in FIG. 1, when displaying white, a positive voltage pulse is applied to drive the white display, and then a negative voltage pulse is applied to balance, and when displaying black, the reverse is performed. Although this drive sequence, which contains full positive and negative voltage pulses in each refresh period, effectively prevents material polarization, it has the significant disadvantage that the period of time for applying the reverse equilibrium voltage does not directly contribute to the final display effect of the current picture, essentially an ineffective drive time. This results in a significant proportion of the total time required for the electronic paper to complete a full-screen refresh being used for balancing operations, severely limiting the refresh rate of the electronic paper. The slow refresh rate has become a key bottleneck affecting user experience and performance expansion of electronic paper in application scenarios where frequent updating of pictures is required. Disclosure of Invention In order to solve the technical problems in the background art, the invention provides a driving method and a driving device for electronic paper. The invention provides an electronic paper driving method, which comprises the following steps: Acquiring N frame image data and N+1 frame image data to be displayed; judging whether the target display state of the target pixel in the N frame is a first gray level or a second gray level according to the N frame image data; judging whether the target display state of the target pixel in the (N+1) th frame is the first gray scale or the second gray scale according to the (N+1) th frame image data; When refreshing the N frame, generating and applying a first driving time sequence to the target pixel according to the target display state of the target pixel in the N frame, wherein the first driving time sequence comprises a first polarity voltage for driving display; Generating and applying a second driving time sequence to the target pixel according to the target display state of the target pixel in the (N+1) th frame when the (N+1) th frame is refreshed, wherein the second driving time sequence comprises a second polarity voltage for driving display; wherein the first driving timing and the second driving timing are configured such that, for the same target pixel, a balance voltage for preventing polarization of liquid crystal is applied only once during refresh of the nth frame and the n+1th frame when a first gray scale is continuously displayed or a second gray scale is continuously displayed. Preferably, the first driving timing omits application of a first type of balance voltage corresponding to the first gray scale when the target display state of the target pixel in the N-th frame is the first gray scale, and