A method for eliminating residual image of display panel by screen protection

Abstract

The present invention relates to a method for eliminating afterimages on a display panel after screen protection, the method comprising the following steps: inputting a current display image and a next display image, obtaining pixel values ​​of a display area in the current display image through digital processing, and forming a pixel value matrix A corresponding to the current display image; converting the pixel value matrix A into a matrix A on a finite set F with an integer p as a base. * ; Establish p-rotation τ on the finite field F, and use p-rotation τ to transform the matrix A * The way each element in acts on the matrix A * The corresponding image is subjected to s grayscale transformations, and the corresponding image after each grayscale transformation is output in the electrophoretic display; the next display screen is output in the electrophoretic display, thereby completing the page turning; the technical solution of the present application overcomes the undesirable situation of two single colors flashing back and forth, and ensures the reader's eyesight health while displaying the screen content in an orderly manner.

Description

Technical Field

[0001] The present invention relates to the field of electronic paper display, and in particular to a method for eliminating afterimages on a display panel by screen protection. Background Art

[0002] When using e-paper, you may occasionally encounter this situation; when the e-paper updates a screen, traces of the previous screen will appear on the edge of the display. This trace is called afterimage. The main reason for the afterimage of e-paper is that the particles in the dispersant of the microcapsule are subjected to complex and uneven forces, making it difficult to unify the particle distribution, resulting in the electrophoretic e-paper display screen being unable to achieve accurate display in a short period of time. Not only that, if the short-term driving waveform design state is not unified, afterimages can also be formed. The adverse effects of the appearance of afterimages on activities such as reading or exhibitions are self-evident. Eliminating afterimages and creating an excellent display environment for e-paper is an unavoidable topic in the current e-paper industry.

[0003] The method for eliminating afterimages in the prior art is to eliminate them as a whole. The specific process of eliminating afterimages is as follows: when turning from the current page to the next page, you must first go through a white image, then a completely black image, and finally the content of the next page will be displayed. Usually, you need to switch back and forth between the black and white screens several times before you can flip to the next page.

[0004] However, this overall process of eliminating afterimages results in a large change in the screen display content, causing the entire screen to flicker back and forth, which can easily lead to a prominent flickering feeling, causing readers to feel uncomfortable when reading e-book content and even damage their eyesight. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a method for eliminating ghosting of a display panel.

[0006] The present invention provides a method for eliminating afterimages on a display panel by using a screen protector, and the technical solution is as follows:

[0007] A method for eliminating afterimages on a display panel by screen protection is characterized in that it is applicable to an electrophoretic display screen and eliminates afterimages during the transition from a current display screen to a next display screen, and includes the following steps:

[0008] Step 1: Input the current display image and the next display image, and obtain pixel values ​​of the display area in the current display image through digital processing to form a pixel value matrix A corresponding to the current display image, where:

[0009]

[0010] A ijrepresents the pixel value corresponding to the i-th row and j-th column of the display area in the current display image, 1≤i≤n, 1≤j≤m;

[0011] Step 2: Convert the pixel value matrix A into a matrix A on a finite set F with integer p as the base * ;

[0012] Step 3: Establish a p-rotation τ on the finite field F, and use the p-rotation τ to transform the matrix A. * The way each element acts on the matrix A * Performing grayscale transformation on the corresponding image s times, and outputting the corresponding image after each grayscale transformation on the electrophoretic display;

[0013] Step 4: outputting the next display image on the electrophoretic display, thereby completing page turning.

[0014] By adopting the above technical solution, compared with the prior art, the technical solution provided by the present invention can at least bring the following beneficial effects: by converting the pixel value matrix A into a matrix A on a finite set F with an integer p as the base * After that, each element of the finite set F represents a grayscale or color, so that only images with fewer grayscale values ​​will appear when switching from the current display image to the next display image, which is beneficial to protecting eyesight. In addition, the matrix A is rotated by p-τ. * The way each element in acts on the matrix A * The corresponding image is transformed into grayscale s times, causing the afterimage particles to jitter multiple times, thus eliminating the afterimage while ensuring that the screen display content is orderly.

[0015] Preferably, the step 2 includes the following steps:

[0016] Step 2.1, randomly select an integer p in the interval [0, 255], and use the integer p to divide the element A in the pixel value matrix A. ij , obtain the element A in the pixel value matrix A ij The remainder when divided by the integer p is

[0017] A ij =Q ij p+a ij ;

[0018] Step 2.2: The element A in the pixel value matrix A is ij Use a ij Replace, and then obtain the matrix A on the finite set F * ,in,

[0019] F = {0, 1, 2, ..., p-1}

[0020] elementa ij ∈F, 1≤i≤n, 1≤j≤m;

[0021] This not only ensures the orderliness of the screen display, but also reduces the grayscale of the image, making it easier to control the grayscale of the image while eliminating ghosting.

[0022] Preferably, the step 2 includes the following steps:

[0023] Step 3.1: Set p-1 thresholds n1, n2, ..., n in the interval [0, 255]. p-1 ,in,

[0024] n1 <n2<...<n p-1 ;

[0025] Step 3.2: Determine the ownership of each element in the pixel value matrix A. If the element A in the pixel value matrix A ij Meet the conditions

[0026] 0≤A ij <n1

[0027] When , the element A in the pixel value matrix A is ij Replace with 0; if the element A in the pixel value matrix A ij Meet the conditions

[0028] n k-1 ≤A ij <n k

[0029] When , the element A in the pixel value matrix A is ij Use n k-1 Replace; if the element A in the pixel value matrix A ij Meet the conditions

[0030] n p-1 ≤A ij ≤255

[0031] When , the element A in the pixel value matrix A is ij Replace with 255, where 2≤k≤p-1, 1≤i≤n, 1≤j≤m;

[0032] Similarly, the above processing not only reduces the difficulty of controlling the grayscale distribution in image display, but also lays the foundation for the next step.

[0033] Preferably, the number of grayscale transformations s in step three is greater than or equal to the integer p; this ensures that each afterimage particle is at least jittered in sequence, thereby promoting the elimination of afterimages.

[0034] Preferably, in the process of switching from the current display image to the next display image, the relaxation time between two adjacent outputs is between 40 milliseconds and 60 milliseconds; this is beneficial to protecting eyesight. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A flow chart of a method for eliminating afterimages on a display panel using a screen protector according to the present invention;

[0036] Figure 2 This is a flow chart of the afterimage elimination process of the present invention. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0038] Example 1

[0039] An embodiment of the present invention provides a method for eliminating afterimages on a display panel after screen protection, which is applicable to eliminating afterimages during transition from a current display screen to a next display screen in an electrophoretic display screen, and includes the following steps:

[0040] Step 1: Input the current display image and the next display image, and obtain pixel values ​​of the display area in the current display image through digital processing to form a pixel value matrix A corresponding to the current display image, where:

[0041]

[0042] A ij Represents the pixel value corresponding to the i-th row and j-th column of the display area in the current display image, 1≤i≤n, 1≤j≤m.

[0043] Step 2: Convert the pixel value matrix A into a matrix A on a finite set F with integer p as the base * ,in,

[0044]

[0045] Step 3: Establish a p-rotation τ on the finite field F, and use the p-rotation τ to transform the matrix A. * The way each element acts on the matrix A * The corresponding image is subjected to s grayscale transformations, and the corresponding image after each grayscale transformation is outputted in the electrophoretic display.

[0046] Specifically,

[0047]

[0048] Thus, the pixel value matrix B1 is obtained, where

[0049]

[0050] 1≤i≤n, 1≤j≤m, the image formed by the image processing of the pixel value matrix B1 is output as the first output in the process of switching from the current display screen to the next display screen in the electrophoresis display;

[0051] Next, the elements in the pixel value matrix B1 are Applying this p-rotation τ once yields τ 2 (α ij ), and order

[0052]

[0053] Where 1≤i≤n, 1≤j≤m, thus obtaining the pixel matrix B2, and

[0054]

[0055] The image formed by the imaging processing of the pixel value matrix B2 is outputted as the second time in the process of switching from the current display screen to the next display screen in the electrophoretic display.

[0056] Then the elements in the pixel value matrix B2 are The p-rotation τ is applied once to obtain a pixel value matrix B3, and the image formed by the pixel value matrix B3 after the imaging process is outputted in the electrophoretic display as the third output in the process of switching from the current display screen to the next display screen; ...; and so on until the s-th output;

[0057] Step 4: Output the next display image on the electrophoretic display, thereby completing the page turning.

[0058] Step 2 in this embodiment includes the following steps:

[0059] Step 2.1. Pick an integer p in the interval [0, 255] and use the integer p to divide the element A in the pixel value matrix A. ij , get the element A in the pixel value matrix A ij The remainder when divided by the integer p is

[0060] A ij =Q ij p+a ij ;

[0061] Step 2.2: Change the element A in the pixel value matrix A to ij Use a ij Replace, and then obtain the matrix A on the finite set F * ,in,

[0062] F = {0, 1, 2, ..., p-1}

[0063] elementa ij ∈F, 1≤i≤n, 1≤j≤m.

[0064] In this embodiment, the number of grayscale transformations s in step three is greater than or equal to an integer p, and the relaxation time between two adjacent outputs during the transition from the current display screen to the next display screen is between 40 milliseconds and 60 milliseconds, with a preferred value of 50 milliseconds.

[0065] Example 2

[0066] This embodiment makes some changes to step 2, and the rest of the steps are the same as those in embodiment 1.

[0067] Step 2 in this embodiment includes the following steps:

[0068] Step 3.1: Set p-1 thresholds n1, n2, ..., n in the interval [0, 255]. p-1 ,in,

[0069] n1 <n2<...<n p-1 ;

[0070] Step 3.2, determine the ownership of each element in the pixel value matrix A. If the element A in the pixel value matrix A ij Meet the conditions

[0071] 0≤A ij <n1

[0072] When , the element A in the pixel value matrix A is ij Replace with 0; if the element A in the pixel value matrix A ij Meet the conditions

[0073] n k-1 ≤A ij <n k

[0074] When , the element A in the pixel value matrix A is ij Use n k-1 Replace; if the element A in the pixel value matrix A ij Meet the conditions

[0075] n p-1 ≤A ij ≤255

[0076] When the element A in the pixel value matrix A is ij Replace with 255, where 2≤k≤p-1, 1≤i≤n, and 1≤j≤m.

[0077] Whether it is Example 1 or Example 2, the integer p is in principle an integer greater than 1, and can be a natural number such as 2, 3, 5, etc. The specific method can be considered based on the grayscale value corresponding to the afterimage particles. For example, when the grayscale value corresponding to the afterimage particles is 0, the integer p can be 2.

[0078] In summary, although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for eliminating afterimages on a display panel by screen protection, characterized by: Applicable to electrophoretic display screens, eliminating afterimages when switching from the current display screen to the next display screen, including the following steps: Step 1: Input the current display image and the next display image, and obtain pixel values ​​of the display area in the current display image through digital processing to form a pixel value matrix A corresponding to the current display image, where: A ij represents the pixel value corresponding to the i-th row and j-th column of the display area in the current display image, 1≤i≤n, 1≤j≤m; Step 2: Convert the pixel value matrix A into a matrix A over a finite field F with an integer p as the base. * ; Step 3: Establish a p-rotation τ on the finite field F, and use the p-rotation τ to transform the matrix A. * The way each element acts on the matrix A * Performing grayscale transformation on the corresponding image s times, and outputting the image corresponding to each grayscale transformation on the electrophoretic display; Step 4: outputting the next display image on the electrophoretic display, thereby completing page turning; The step three is to perform the matrix A * The grayscale transformation method for the corresponding image is: make Thus, the pixel value matrix B1 is obtained, where 1≤i≤n, 1≤j≤m, the image formed by the image processing of the pixel value matrix B1 is output as the first output in the process of switching from the current display screen to the next display screen in the electrophoresis display; Next, the elements in the pixel value matrix B1 are Applying this p-rotation τ once yields τ 2 (a ij ), and order Where 1≤i≤n, 1≤j≤m, thus obtaining the pixel matrix B2, and The image formed by the image processing of the pixel value matrix B2 is outputted as the second time in the process of switching from the current display screen to the next display screen in the electrophoretic display; Then the elements in the pixel value matrix B2 are The p-rotation τ is applied once to obtain the pixel value matrix B3, and the image formed by the imaging processing of the pixel value matrix B3 is output in the electrophoretic display as the third output in the process of switching from the current display screen to the next display screen; ...; and so on until the sth output.

2. The method for eliminating afterimages on a display panel by using a screen saver according to claim 1, wherein: The second step includes the following steps: Step 2.1, randomly select an integer p in the interval [0, 255], and use the integer p to divide the element A in the pixel value matrix A. ij , obtain the element A in the pixel value matrix A ij The remainder when divided by the integer p is A ij =Q ij p+a ij ; Step 2.2: The element A in the pixel value matrix A is ij Use a ij Replace, and then obtain the matrix A on the finite field F * ,in, F = {0, 1, 2, ..., p-1} Element a ij ∈F, 1≤i≤n, 1≤j≤m.

3. The method for eliminating afterimages on a display panel by using a screen saver according to claim 1, wherein: The second step includes the following steps: Step 3.1: Set p-1 thresholds n1, n2, ..., n in the interval [0, 255]. p-1 ,in, n1 <n2<...<n p-1 ; Step 3.2: Determine the ownership of each element in the pixel value matrix A. If the element A in the pixel value matrix A ij Meet the conditions 0≤A ij <n1 When , the element A in the pixel value matrix A is ij Replace with 0; if the element A in the pixel value matrix A ij Meet the conditions n k-1 ≤A ij <n k When , the element A in the pixel value matrix A is ij Use n k-1 Replace; if the element A in the pixel value matrix A ij Meet the conditions n p-1 ≤A ij ≤255 When , the element A in the pixel value matrix A is ij Replace with 255, where 2≤k≤p-1, 1≤i≤n, and 1≤j≤m.

4. The method for eliminating afterimages on a display panel by using a screen saver according to claim 2 or 3, wherein: The number of grayscale transformations s in step three is greater than or equal to the integer p.

5. The method for eliminating afterimages on a display panel by using a screen saver according to claim 4, wherein: In the process of switching from the current display image to the next display image, the relaxation time between two adjacent outputs is between 40 milliseconds and 60 milliseconds.

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