An electronic paper driving method with automatic removal of afterimages from fast swipe

Abstract

The present invention relates to an electronic paper driving method for automatically clearing afterimages after fast swiping, comprising several frames of driving waveforms for fast swiping display, wherein at least one frame of a screen-clearing waveform for clearing afterimages is inserted into every X frames of the driving waveform. By adding at least one frame of a screen-clearing waveform after every X frames of the driving waveform, charged particles of various colors are returned to an initialized state, thereby significantly improving the afterimage phenomenon on the screen. At the same time, the Vpixel signal waveform of the screen-clearing waveform is the same as the Vpixel signal waveform of the adjacent previous frame of the driving waveform, and the Vcom signal wave is reversely compensated based on the voltage polarity of the Vpixel signal wave, so that the voltage difference between the Vpixel signal wave and the Vcom signal wave becomes larger, and the black particles are pushed to the bottom. While eliminating the afterimage phenomenon, the display state of the previous frame can be maintained, and the screen flickering phenomenon will not occur, thereby improving the display effect and user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic paper, and in particular to an electronic paper driving method capable of automatically clearing afterimages caused by rapid swiping. Background Art

[0002] Electronic paper is a display screen made using electrophoretic display technology. It displays images by continuously applying a driving voltage waveform to each pixel through a driver integrated circuit. Specifically, electronic paper comprises a front plane laminate (FPL), a transistor array substrate, and a display array sandwiched between the front plane and the transistor array substrate. The display array is composed of a plurality of microcapsules arranged in an array, each containing a black liquid and white charged particles. The voltage difference between the Vpixel and Vcom electrodes of the transistor array substrate causes the black and white charged particles to move, ultimately presenting a white or black image.

[0003] As fast-refresh products place increasingly higher demands on display drive time, the refresh time of the driving waveform for each picture becomes shorter and shorter. For example, the refresh time of a normal price tag is ~20s, but the refresh time for a fast-refresh product is <0.5s. At the same time, the driving waveform of a fast refresh is significantly different from that of a traditional price tag. As the number of refreshes accumulates, after multiple cycles of positive and negative frequencies, the electron particles cannot return to their initial state, and a bias is generated. The Cfpl capacitance accumulated in this cyclical screen refresh causes the charged particles in the electronic paper membrane to polarize. When a negative frame is refreshed, the black particles cannot reach the bottom, resulting in afterimages. The more severe the afterimage of the previous picture displayed on the screen, the worse the display visual effect. Summary of the Invention

[0004] The problem solved by the present invention is how to solve the afterimage produced by fast-swiping products and improve the screen display effect.

[0005] To solve the above problems, the present invention provides an electronic paper driving method with automatic image afterimage removal after fast swiping, including several frames of driving waveforms for fast swiping display, at least one frame of screen-clearing waveform for removing image afterimages is inserted into every X frames of the driving waveform, the driving waveform and the screen-clearing waveform both include a Vpixel signal wave and a Vcom signal wave, and when refreshing the driving waveform for X frames, the Vcom signal wave in each frame of the driving waveform is a pre-burned Vcom voltage; after refreshing the driving waveform for X frames, the screen-clearing waveform is entered to remove image afterimages, the Vpixel signal wave in the screen-clearing waveform retrieves the Vpixel signal wave in the driving waveform of the previous frame, and the voltage polarity of the Vcom signal wave in the screen-clearing waveform is opposite to the voltage polarity of the Vpixel signal wave in the screen-clearing waveform.

[0006] The beneficial effects of the present invention are as follows: by adding at least one frame of clearing waveform after every X frames of driving waveform to return the charged particles of each color to the initialized state, the afterimage phenomenon of the screen can be significantly improved; at the same time, the Vpixel signal waveform of the clearing waveform is the same as the Vpixel signal waveform of the adjacent previous frame driving waveform, and the Vcom signal wave is reversely compensated based on the voltage polarity of the Vpixel signal wave, so that the voltage difference between the Vpixel signal wave and the Vcom signal wave becomes larger, and the black particles are pushed to the bottom, eliminating the afterimage phenomenon while maintaining the display state of the previous frame, without causing screen flickering, thereby improving the display effect and user experience.

[0007] Preferably, the voltage assignment of the Vcom signal wave in the clearing waveform specifically includes:

[0008] Determine whether the voltage polarity of the Vpixel signal wave in the clear screen waveform is a positive voltage. If so, the voltage of the Vcom signal wave in the clear screen waveform is If not, the voltage of the Vcom signal wave in the clear screen waveform is Further increase the voltage difference between the Vpixel signal wave and the Vcom signal wave, where k is a preset parameter.

[0009] As a preference, the voltage polarity of the Vpixel signal wave in the screen clearing waveform is determined to be a positive voltage. If so, set Frame clear screen waveform; if not, then set Frame clearing waveform, p is the preset parameter.

[0010] Preferably, the waveform frequency of the Vpixel signal wave in the clearing waveform and the multiple of the waveform frequency of the Vpixel signal wave in the driving waveform are consistent with the voltage value of the Vcom signal wave in the clearing waveform and the multiple of the voltage value of the Vcom signal wave in the driving waveform. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a waveform diagram of specific embodiment 1 of the present invention;

[0012] Figure 2 The Vpixel signal wave in the screen clearing waveform of the specific embodiment 2 of the present invention is a driving waveform diagram for displaying a white screen;

[0013] Figure 3 The Vpixel signal wave in the screen clearing waveform of the specific embodiment 2 of the present invention is a waveform diagram showing a black screen;

[0014] Figure 4 The Vpixel signal wave in the screen clearing waveform of the specific embodiment 3 of the present invention is a driving waveform diagram for displaying a white screen;

[0015] Figure 5 The Vpixel signal wave in the screen clearing waveform of the specific embodiment 3 of the present invention is a waveform diagram showing a black screen;

[0016] Figure 6 This is a waveform diagram of specific embodiment 4 of the present invention. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiment 1

[0019] A method for driving electronic paper with automatic image afterimage removal by fast swiping includes several frames of driving waveforms for fast swiping display. The driving waveforms of this embodiment specifically include driving waveforms for displaying black and white. The fast swiping driving waveform for displaying black is a driving waveform that circulates N times with a voltage of +15V, and the fast swiping driving waveform for displaying white is a driving waveform that circulates N times with a voltage of -15V. The driving waveforms for fast swiping to display black or white are prior art and will not be described in detail here. At least one frame of screen clearing waveform for clearing image afterimage is inserted into every X frames of the driving waveform, such as Figure 1 As shown, this embodiment uses each brush Figure 2 A frame of clearing waveform is inserted after the frame. Both the driving waveform and the clearing waveform include a Vpixel signal wave and a Vcom signal wave. When refreshing two frames of the driving waveform, the Vcom signal wave in each frame of the driving waveform is a pre-burned Vcom voltage. In this embodiment, the pre-burned Vcom voltage is -0.5V. After refreshing two frames of the driving waveform, the clearing waveform is entered to clear the residual image. The Vpixel signal wave in the clearing waveform retrieves the Vpixel signal wave in the previous frame of the driving waveform. In this embodiment, the Vpixel signal wave in the clearing waveform is a driving waveform that displays a white screen. The voltage polarity of the Vcom signal wave in the clearing waveform is opposite to that of the Vpixel signal wave in the clearing waveform. In this embodiment, the voltage of the Vcom signal wave in the clearing waveform is +0.5V. Specific embodiment 2

[0021] This embodiment adds the following specific conditions for assigning the voltage of the Vcom signal wave in the screen-clearing waveform based on the specific embodiment 1:

[0022] Determine whether the voltage polarity of the Vpixel signal wave in the clear screen waveform is a positive voltage. If so, Figure 3 As shown, the Vpixel signal wave in the clear screen waveform is the driving waveform for displaying a black screen, and the voltage of the Vcom signal wave in the clear screen waveform is Where X = 2 frames, Vcom voltage is -0.5V, then the voltage of Vcom signal wave in the clear screen waveform is -0.1V; if not, then Figure 2 As shown, the Vpixel signal wave in the clear screen waveform is the driving waveform for displaying a white screen, and the voltage of the Vcom signal wave in the clear screen waveform is Where X=4 frames, the Vcom voltage is -0.5V, and the voltage of the Vcom signal wave in the clearing waveform is +0.1V, further increasing the voltage difference between the Vpixel signal wave and the Vcom signal wave. Specific embodiment 3

[0024] The specific embodiment adds the following frame number condition on the screen clearing waveform on the basis of the specific embodiment 1:

[0025] The voltage polarity of the Vpixel signal wave in the screen clearing waveform is judged to be positive. If so, Figure 4 As shown, the clear screen waveform shows a black screen, then set Frame clearing waveform, in this embodiment, p = 2, when X = 4 frames, insert 2 frames clearing waveform; if not, then as Figure 5 As shown, the voltage polarity of the Vpixel signal wave in the clear screen waveform is negative, and the screen is displayed as a white screen, then set Frame clearing waveform, such as Figure 5 As shown, p is a preset parameter. When X=4 frames, a 1-frame clearing waveform is inserted. Specific embodiment 4

[0027] This embodiment adds the following on the basis of the specific embodiment 1: Figure 6 As shown, the waveform frequency of the Vpixel signal wave in the clearing waveform is twice the waveform frequency of the Vpixel signal wave in the driving waveform. When the waveform frequency of the Vpixel signal wave in the driving waveform is 50 Hz, the waveform frequency of the Vpixel signal wave is 100 Hz. At the same time, the voltage value of the Vcom signal wave in the clearing waveform is twice the voltage value of the Vcom signal wave in the driving waveform.

[0028] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. An electronic paper driving method with automatic removal of afterimages after fast swiping, characterized in that: The system includes several frames of driving waveforms for fast refresh display. At least one frame of screen-clearing waveform for clearing residual images is inserted into every X frames of the driving waveform. The driving waveform and the screen-clearing waveform both include a Vpixel signal wave and a Vcom signal wave. When refreshing the driving waveform for X frames, the Vcom signal wave in each frame of the driving waveform is the pre-burned Vcom voltage. After refreshing the driving waveform for X frames, the screen-clearing waveform is entered to clear residual images. The Vpixel signal wave in the screen-clearing waveform retrieves the Vpixel signal wave in the driving waveform of the previous frame. The voltage polarity of the Vcom signal wave in the screen-clearing waveform is opposite to the voltage polarity of the Vpixel signal wave in the screen-clearing waveform.

2. The electronic paper driving method for automatically clearing afterimages after fast swiping according to claim 1, characterized in that: The voltage assignment of the Vcom signal wave in the screen clearing waveform specifically includes: Determine whether the voltage polarity of the Vpixel signal wave in the clear screen waveform is a positive voltage. If so, the voltage of the Vcom signal wave in the clear screen waveform is If not, the voltage of the Vcom signal wave in the clear screen waveform is , It is a preset parameter, and the Vcom voltage is a negative number.

3. The electronic paper driving method for automatically clearing afterimages after fast swiping according to claim 1, characterized in that: Determine whether the voltage polarity of the Vpixel signal wave in the clear screen waveform is positive voltage. If so, set Frame clear screen waveform; if not, then set Frame clearing waveform, are preset parameters.

4. The electronic paper driving method for automatically clearing afterimages after fast swiping according to claim 2, characterized in that: The waveform frequency of the Vpixel signal wave in the clearing waveform and the multiple of the waveform frequency of the Vpixel signal wave in the driving waveform are consistent with the voltage value of the Vcom signal wave in the clearing waveform and the multiple of the voltage value of the Vcom signal wave in the driving waveform.

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