CN114495840A - Display device and driving method thereof - Google Patents

Abstract

A display device includes a display panel and a display driver. The display driver is coupled to the display panel. The display driver is used for driving the display panel to display the image frame by at least one of the gray-scale values in the first state. The display driver is used for driving the display panel to display the standby frame by the default gray-scale value in the second state. The display driver determines a default gray level value of the standby frame according to the gray level values of the image frames. In addition, a driving method of the display device is also provided.

Description

Display device and driving method thereof

technical field

The present invention relates to an electronic device and a driving method thereof, in particular to a display device and a driving method thereof.

Background technique

In recent years, electronic paper display devices have been widely used in e-readers (eg, e-books, e-newspapers) or other electronic components (eg, electronic tags) due to the advantages of thinness, durability, and low power consumption in line with energy conservation and environmental protection. ). However, taking a flexible electronic paper display device as an example, after the flexible electronic paper display device is folded or rolled for a long time or multiple times, its display panel may The mechanical fatigue effect reduces its performance. Therefore, when the performance of the display panel is degraded due to the mechanical fatigue effect, the grayscale or color of the pixels may vary greatly compared to the surrounding area. The user may perceive this difference in a normal display state, and feel the unevenness (mura) of the image frame, thereby degrading his user experience.

SUMMARY OF THE INVENTION

The present invention provides a display device and a driving method thereof, which display uniform image frames and can provide good user experience.

The display device of the present invention includes a display panel and a display driver. The display driver is coupled to the display panel. The display driver is used for driving the display panel to display image frames with at least one of a plurality of grayscale values in the first state. The display driver is used for driving the display panel to display a standby frame with a default grayscale value in the second state. The display driver determines the default grayscale value of the standby frame according to the grayscale value of the image frame.

In an embodiment of the present invention, the above-mentioned grayscale value includes a first grayscale value and a second grayscale value, and the arithmetic mean of the first grayscale value and the second grayscale value is the median of the grayscale value number. The default grayscale value is selected from the first grayscale value or the second grayscale value.

In an embodiment of the present invention, the above-mentioned grayscale value includes a first grayscale value and a second grayscale value, and the arithmetic mean of the first grayscale value and the second grayscale value is the median of the grayscale value number. The grayscale value also includes the lowest grayscale value. In the first state, the display driver drives the display panel to display the background portion of the image frame at the lowest grayscale value. The first grayscale value and the second grayscale value are greater than the lowest grayscale value. The default grayscale value is greater than or equal to the lowest grayscale value, and the default grayscale value is smaller than the first grayscale value or the second grayscale value.

In an embodiment of the present invention, the above-mentioned grayscale value includes a first grayscale value and a second grayscale value, and the arithmetic mean of the first grayscale value and the second grayscale value is the median of the grayscale value number. The grayscale value also includes the highest grayscale value. In the first state, the display driver drives the display panel to display the background portion of the image frame at the highest grayscale value. The first grayscale value and the second grayscale value are smaller than the highest grayscale value. The default grayscale value is less than or equal to the highest grayscale value, and the default grayscale value is greater than the first grayscale value or the second grayscale value.

In an embodiment of the present invention, the above-mentioned display driver is further configured to calculate the average gray level of each pixel on the display panel, and determine the default gray level value according to the average gray level of each pixel.

In an embodiment of the present invention, the above-mentioned standby frame includes a dot pattern. The checkerboard pattern includes a plurality of pixel blocks. Each pixel block includes at least one pixel. The display driver drives a portion of the pixel block to display the standby frame with a default grayscale value. The pixel blocks driven with the default grayscale values are not adjacent in the horizontal and vertical directions.

The driving method for a display device of the present invention includes: in a first state, driving a display panel to display an image frame with at least one of a plurality of grayscale values; determining a default grayscale value according to the grayscale value of the image frame; and In the second state, the display panel is driven to display the standby frame with the default grayscale value.

In an embodiment of the present invention, the above-mentioned grayscale value includes a first grayscale value and a second grayscale value, and the arithmetic mean of the first grayscale value and the second grayscale value is the median of the grayscale value number. The default grayscale value is selected from the first grayscale value or the second grayscale value.

In an embodiment of the present invention, the above-mentioned driving method of a display device further includes, in the first state, driving the display panel to display the background portion of the image frame with the lowest grayscale value. The grayscale values include a first grayscale value, a second grayscale value, and a lowest grayscale value. The first grayscale value and the second grayscale value are greater than the lowest grayscale value. The arithmetic mean of the first grayscale value and the second grayscale value is the median of the grayscale values. The default grayscale value is greater than or equal to the lowest grayscale value, and the default grayscale value is smaller than the first grayscale value or the second grayscale value.

In an embodiment of the present invention, the above-mentioned driving method for a display device further includes, in the first state, driving the display panel to display the background portion of the image frame with the highest grayscale value. The grayscale values include a first grayscale value, a second grayscale value, and a highest grayscale value. The first grayscale value and the second grayscale value are smaller than the highest grayscale value. The arithmetic mean of the first grayscale value and the second grayscale value is the median of the grayscale values. The default grayscale value is less than or equal to the highest grayscale value, and the default grayscale value is greater than the first grayscale value or the second grayscale value.

In an embodiment of the present invention, the above-mentioned standby frame includes a checkerboard pattern. The checkerboard pattern includes a plurality of pixel blocks. Each pixel block includes at least one pixel. The step of driving the display panel to display the standby frame with the default grayscale value in the flexed state includes driving a portion of the pixel block to display the standby frame with the default grayscale value. The pixel blocks driven with the default grayscale values are not adjacent in the horizontal and vertical directions.

Based on the above, in the embodiment of the present invention, the display driver drives the display panel to display the standby frame with the default grayscale value in the flexed state, which can prevent the user from feeling the unevenness of the image frame in the first state.

Description of drawings

The accompanying drawings are included to provide a further understanding of the present invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

FIG. 1 shows a schematic diagram of a flexible electronic paper display device according to an embodiment of the present invention;

2 is a schematic diagram illustrating a state change of a flexible electronic paper display device and a corresponding display frame thereof according to an embodiment of the present invention;

FIG. 3 shows a flowchart of steps of a method for driving a display device according to an embodiment of the present invention;

FIG. 4 is a graph showing the relationship between fatigue cycle and gray scale deterioration of a flexible electronic paper display device according to an embodiment of the present invention;

FIG. 5 shows a schematic diagram of a standby frame including a checkerboard pattern according to an embodiment of the present invention.

Explanation of reference numerals

100: Flexible electronic paper display device

110: Display driver

120: Flexible electronic paper display panel

300: Curve

400: Checkerboard Pattern

410, 420: pixel block

M100, M120: Image frame

M110: Standby frame

S1: drive signal

S2: Image data

S100, S120: Non-deflection state

S110: Deflection state

S200, S210, S220: method steps

Detailed ways

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals are used in the drawings and description to refer to the same or like parts.

In the following, a flexible electronic paper display device is used as an exemplary embodiment of the display device, and is described in detail with the accompanying drawings, but the display device of the present invention is not limited to a flexible electronic paper display device.

FIG. 1 shows a schematic diagram of a flexible electronic paper display device according to an embodiment of the present invention. Referring to FIG. 1 , the flexible electronic paper display device 100 of this embodiment includes a display driver 110 and a flexible electronic paper display panel 120 . The display driver 110 is coupled to the flexible electronic paper display panel 120 . The display driver 110 outputs a driving signal S1 for driving the flexible electronic paper display panel 120 to display image frames. The flexible electronic paper display device 100 may be a color electronic paper display device or a black and white electronic paper display device, which is not limited in the present invention. Therefore, the image frame displayed on the flexible electronic paper display panel 120 may include a color image or a grayscale image, and its image content is determined by the image data S2 input to the display driver 110 , and may include plain text content or other non-text content content. The flexible electronic paper display device 100 of the embodiment of the present invention may also be a flexible organic light emitting diode display device or other flexible display devices.

FIG. 2 is a schematic diagram illustrating state changes and corresponding display frames of the flexible electronic paper display device according to an embodiment of the present invention. Referring to FIG. 1 and FIG. 2, the state of the flexible electronic paper display device 100 can be changed from an unfolding state (first state) S100 to a folding state (second state) S110, Then, it transitions from the flexed state S110 back to the non-flexed state S120 . Correspondingly, the frames displayed on the flexible electronic paper display panel 120 are the image frame M100, the standby frame M110, and the image frame M120, respectively.

The non-flexed states S100 and S120 are the states in which the user is using the flexible electronic paper display device for reading or viewing, so the non-flexing states S100 and S120 can also be slightly deformed states, that is, they can be read or viewed normally. first state. In the non-flexed states S100 and S120, the flexible electronic paper display panel 120 may be set to a flat, non-flexed or non-rolled state. In the non-flexed states S100 and S120 , the display driver 110 drives the flexible electronic paper display panel 120 to display image frames M100 and M120 respectively with at least one of a plurality of grayscale values. The image content of the image frames M100 and M120 may be the same or different, which is determined by the image data S2 input to the display driver 110, and may include plain text content or other non-text content. The gray-scale value range for driving the flexible electronic paper display panel 120 may be a gray-scale value range from 0-15 or 0-127 or 0-255. Only the above-mentioned gray scale value range is not intended to limit the present invention.

On the other hand, the flexed state S110 is a state in which the flexible electronic paper display device 100 is in a standby state when the user does not use the flexible electronic paper display device 100 , for example, a storage state. In the bending state S110, the flexible electronic paper display panel 120 may be set in an uneven, bent or wound state. In the deflection state S110 , the display driver 110 drives the flexible electronic paper display panel 120 to display the standby frame M110 with the default grayscale value. The display driver 110 determines the default grayscale value according to the grayscale value of 0-15 or 0-127 or 0-255. The standby frame M110 may be a gray frame having the same gray scale value. Alternatively, the standby frame M110 may include a checkerboard pattern.

FIG. 3 shows a flowchart of steps of a method for driving a display device according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 3 , the driving method of this embodiment is applicable to the display device 100 of FIG. 1 , for example. In step S200, in the first state, the display driver 110 drives the display panel 120 to display an image frame with at least one of the plurality of grayscale values. In step S210, a default grayscale value is determined according to the grayscale value of the display driver 110. In step S220, in the second state, the display driver 110 drives the display panel 120 to display the standby frame with the determined default grayscale value.

In addition, sufficient teachings, suggestions and implementation descriptions can be obtained from the description of the embodiments in FIG. 1 to FIG. 2 for the driving method of the display device of this embodiment.

In the embodiments of FIG. 1 to FIG. 3 , the display driver 110 determines the default gray level value of the standby frame according to the gray level value of the image frame. Different implementations for determining the default grayscale value of the standby frame are described below.

[First Embodiment]

In the non-flexed state, the display driver 110 drives the flexible electronic paper display panel 120 to display image frames with grayscale values of 0˜15, for example. In this embodiment, in the flexed state, the display driver 110 can select the first grayscale value of 7 or the second grayscale value of 8 to drive the flexible electronic paper display panel 120 to display the standby frame. That is, the default grayscale value is selected from the first grayscale value of 7 or the second grayscale value of 8, and the grayscale values of 0 to 15 include the first grayscale value of 7 and the second grayscale value of 8. The arithmetic mean 7.5 of the first grayscale value 7 and the second grayscale value 8 is the median of the grayscale values 0-15.

FIG. 4 is a graph showing the relationship between fatigue cycle and gray scale degradation of a flexible electronic paper display device according to an embodiment of the present invention. Please refer to FIG. 4 . The vertical axis of FIG. 4 indicates that the gray scale values used to drive the flexible electronic paper display panel 120 to display image frames are 0 to 15. The default value used to drive the flexible electronic paper display panel 120 to display the standby frame The grayscale value is, for example, 8. The horizontal axis of FIG. 4 represents the number of mechanical fatigue times (that is, fatigue cycles) of the flexible electronic paper display device 100 during the repeated bending or winding process, which are 50,000 times (50k) and 100,000 times, respectively. times (100k), 200,000 times (200k).

In this embodiment, the 16 grayscale black and white flexible electronic paper display device 100 takes a frame with a default grayscale value of 8 as the standby frame in the flexed state. Therefore, the standby frame is a gray frame in which all grayscale values are the same. In this embodiment, a grayscale value of 0 is defined as a black frame, and a grayscale value of 15 is defined as a white frame. In an embodiment, in the flexing state, a frame with a grayscale value of 7 may be used as a standby frame by default. When the flexible electronic paper display device 100 is subjected to mechanical fatigue during repeated bending or rolling, the performance of the flexible electronic paper display panel 120 is degraded and the driving capability is degraded. The performance degradation is shown as curve 300 . Since the standby frame of the flexible electronic paper display device 100 is a frame with a grayscale value of 8, the maximum grayscale difference from a black image frame (grayscale value 0) or a white image frame (grayscale value 15) is 7-8 grayscales. The maximum gray level difference between the standby frame and the image frame is within 7-8 gray levels, which can prevent human visual perception from feeling the unevenness of the image frame in the non-flexed state, thereby providing a good user experience. That is to say, when the display is in a state of being bent or wound, it is in standby at a specific frame. After the performance of the electronic paper ink is degraded by the mechanical fatigue effect, the difference between the specific standby frame and the surrounding display elements is small, which makes it difficult for the human eye to determine the difference, which can be avoided. Human visual perception perceives image frame inhomogeneity in the unflexed state.

For example, since the ink in the electronic ink layer has a certain Gaussian distribution in its mechanical strength during the manufacturing process. Therefore, in the bending region, most of the electronic paper inks, which are subject to the fatigue effect, but whose driving ability has not been damaged, can be normally driven to grayscale 15 when the driving is a white frame. In the bending area, another small part of the electronic paper ink deteriorated by the fatigue effect can only be driven to gray level 14 when the driving is white frame. Therefore, compared with the adjacent undamaged electronic ink, There is only one grayscale difference, and since its number is much smaller than that of undamaged e-paper ink, it is possible to avoid the perception of frame unevenness by human visual perception. Vice versa, if the electronic ink in the bending area is driven to the black frame, most of it is subject to the fatigue effect, but the driving ability of the electronic paper ink has not been damaged, and a small part of the electronic paper adjacent to the electronic paper is affected by the fatigue effect and the driving ability is deteriorated. Ink, there is only one gray level difference, so it can avoid the perception of frame unevenness by human visual perception. In one embodiment, the 128 grayscale black and white flexible electronic paper display device 100 takes, for example, a frame with a default grayscale value of 63 or 64 as a standby frame in a flexed state. In another embodiment, the 256 grayscale black and white flexible electronic paper display device 100 takes, for example, a frame with a default grayscale value of 127 or 128 as a standby frame in a flexed state.

[Second Embodiment]

In this embodiment, taking the black and white flexible electronic paper display device 100 of 16 grayscales as an example, when the use context of the flexible electronic paper display device 100 is a dark background, the flexible electronic paper display device 100 is The default grayscale value of the standby frame in the flexing state can be set to one of 0-8. For example, in the non-flexed state, the display driver 110 drives the flexible electronic paper display panel 120 to display the background portion of the image frame at the lowest grayscale value of 0 (that is, the grayscale value of the background portion of the image frame is 0), while in the flexible electronic paper display panel 120 In the music state, the grayscale value of the standby frame can also be set to 0. Therefore, when the use context of the flexible electronic paper display device 100 is a dark background, the default grayscale value is greater than or equal to the lowest grayscale value of 0, and the default grayscale value is less than the second grayscale value of 8.

In another embodiment, the default grayscale value of the standby frame of the flexible electronic paper display device 100 in the deflected state may be set to one of 0˜7. Therefore, when the use context of the flexible electronic paper display device 100 is a dark background, the default grayscale value is greater than or equal to the lowest grayscale value of 0, and the default grayscale value is less than the first grayscale value of 7.

On the other hand, in this embodiment, when the use context of the flexible electronic paper display device 100 is a light-colored background, the default grayscale value of the standby frame of the flexible electronic paper display device 100 in the flexible state can be Set to one of 7 to 15. For example, in the non-flexed state, the display driver 110 drives the flexible electronic paper display panel 120 to display the background portion of the image frame at the highest grayscale value of 15 (that is, the grayscale value of the background portion of the image frame is 15), while in the flexible electronic paper display panel 120 In the music state, the grayscale value of the standby frame can also be set to 15. Therefore, when the flexible electronic paper display device 100 is used in a light-colored background, the default grayscale value is less than or equal to the highest grayscale value of 15, and the default grayscale value is greater than the first grayscale value of 7.

In another embodiment, the default grayscale value of the standby frame of the flexible electronic paper display device 100 in the deflected state may be set to one of 8˜15. Therefore, when the use context of the flexible electronic paper display device 100 is a light-colored background, the default grayscale value is less than or equal to the highest grayscale value of 0, and the default grayscale value is greater than the second grayscale value of 8.

[Third Embodiment]

In this embodiment, the display driver 110 calculates the average gray level of each pixel on the flexible electronic paper display panel 120, and determines the default gray level value according to the average gray level of each pixel. That is to say, the display driver 110 counts the grayscale or color displayed by each pixel during use according to the usage status of the flexible electronic paper display device 100, and calculates the average value of the grayscale displayed by each pixel. The grayscale average is set as the default grayscale value for standby frames.

For example, taking the black and white flexible electronic paper display device 100 with 16 grayscales as an example, in the application of an e-book reader, in the non-flexed state, the peripheral area of the image frame mainly displays a white background, and the middle area mainly displays a white background. Black on white. Therefore, in the deflection state, the default grayscale value of the peripheral area of the standby frame may be set to 15, and the default grayscale value of the middle area may be set to 6˜9.

[Fourth Embodiment]

FIG. 5 shows a schematic diagram of a standby frame including a checkerboard pattern according to an embodiment of the present invention. Please refer to FIG. 5 , the standby frame M110 of this embodiment includes a checkerboard pattern 400 . The checkerboard pattern 400 includes a plurality of pixel blocks 410 and 420 . Each pixel block includes at least one pixel. For example, each pixel block includes 1-5 pixels. In this embodiment, the display driver 110 drives a part of the pixel block to display the standby frame M110 with a default grayscale value. For example, taking the black and white flexible electronic paper display device 100 of 16 gray scales as an example, the display driver 110 drives the pixel block 410 to display the darker block in the standby frame M110 with the default gray scale value of 0. The pixel blocks 410 driven with the default grayscale value of 0 are not adjacent in the horizontal direction and the vertical direction. Similarly, the display driver 110 drives the pixel block 420 to display the lighter color block in the standby frame M110 with the default grayscale value of 15. The pixel blocks 420 driven with the default grayscale value of 15 are not adjacent in the horizontal direction and the vertical direction. Therefore, the pixel blocks 410 and 420 are evenly distributed on the standby frame M110 to form the checkerboard pattern 400 .

In this embodiment, when the flexible electronic paper display panel 120 is driven by the evenly distributed pixel blocks 410 and 420 as the standby frame M110, even if the flexible electronic paper display panel 120 When the mechanical fatigue effect reduces the performance, the user will also reduce the unevenness of the image frame in the non-flexed state, thereby providing a good user experience. For example, in the checkerboard standby frame, the distribution probability of the e-ink potentially damaged by the fatigue effect is half in the black and white pixel areas, so the image frame perceived by the user during normal use is not the same. Uniform, which is half of the standby frame using grayscale 15 or grayscale 0.

[Fifth Embodiment]

Taking a color flexible electronic paper display device as an example, the display driver 110 drives the flexible electronic paper display panel 120 to display a standby frame in a light gray gray scale when the display driver 110 is in a flexed state. In the grayscale range of 0˜15, the light grayscale is a grayscale value greater than 8. In the gray scale range of 0˜255, the light gray scale is a gray scale value greater than 128.

When the performance of the flexible electronic paper display panel 120 is degraded due to mechanical fatigue effect, the light gray failed pixels are easily rendered by the surrounding normal pixels, so that the user will also reduce the feeling of uneven image frame in the non-flexed state. For example, human perception of color is limited by the effects of chromatic adaptation, Luminance, and area of objects. In terms of color adaptability, white is the most susceptible to surrounding colors. For example, when a small white point is surrounded by red, the human eye will judge it as a slightly lighter red instead of a little white and a lot of red, which is the rendering effect. In terms of brightness, the human eye cannot detect its presence when there is insufficient brightness, so light gray reduces the brightness and makes the pixel less noticeable as it gradually fails. As far as the object area is concerned, when the object area is small, the human eye cannot detect the existence of the failed pixel.

Therefore, the display driver 110 can determine the default grayscale value according to at least one of the first to fifth embodiments, but the present invention is not limited to the above five methods.

To sum up, in the embodiment of the present invention, the display driver determines the default grayscale value according to the grayscale value of the image frame. In the flexed state, the display driver drives the flexible electronic paper display panel to display the standby frame with the determined default grayscale value. In this way, it is possible to prevent the user from feeling the unevenness of the image frame in the non-flexed state.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (11)

1. A display device, comprising:

a display panel; and

a display driver coupled to the display panel for:

in a first state, driving the display panel to display an image frame by at least one of a plurality of gray-scale values; and

in a second state, the display panel is driven by a default gray-scale value to display a standby frame, wherein the display driver determines the default gray-scale value according to the gray-scale value.

2. The display device according to claim 1, wherein

The gray scale values comprise a first gray scale value and a second gray scale value, and the arithmetic mean of the first gray scale value and the second gray scale value is the median of the gray scale values; and

the default gray scale value is selected from the first gray scale value or the second gray scale value.

3. The display device according to claim 1, wherein

The gray scale values comprise a first gray scale value and a second gray scale value, and the arithmetic mean of the first gray scale value and the second gray scale value is the median of the gray scale values;

the gray scale values further include a lowest gray scale value, and in the first state, the display driver drives the display panel to display a background portion of the image frame at the lowest gray scale value, wherein the first gray scale value and the second gray scale value are greater than the lowest gray scale value; and

the default gray scale value is greater than or equal to the lowest gray scale value, and the default gray scale value is less than the first gray scale value or the second gray scale value.

4. The display device according to claim 1, wherein

The gray scale values comprise a first gray scale value and a second gray scale value, and the arithmetic mean of the first gray scale value and the second gray scale value is the median of the gray scale values;

the gray scale values further include a highest gray scale value, and in the first state, the display driver drives the display panel to display a background portion of the image frame at the highest gray scale value, wherein the first gray scale value and the second gray scale value are less than the highest gray scale value; and

the default gray scale value is less than or equal to the highest gray scale value, and the default gray scale value is greater than the first gray scale value or the second gray scale value.

5. The display apparatus of claim 1, wherein the display driver is further configured to calculate a gray-scale average value for each pixel on the display panel, and determine the default gray-scale value according to the gray-scale average value for each pixel.

6. The display device according to claim 1, wherein

The standby frame includes a checkerboard pattern including a plurality of pixel blocks, each of the pixel blocks including at least one pixel, and the display driver drives a portion of the pixel blocks with the default gray-scale value to display the standby frame,

wherein the pixel blocks driven with the default grayscale values are not adjacent in a horizontal direction and a vertical direction.

7. A driving method of a display device including a display panel, the driving method comprising:

in a first state, driving the display panel to display an image frame by at least one of a plurality of gray-scale values;

determining a default gray level value according to the gray level value; and

in a second state, the display panel is driven by the default gray-scale value to display a standby frame.

8. The driving method of a display device according to claim 7, wherein

The gray scale values comprise a first gray scale value and a second gray scale value, and the arithmetic mean of the first gray scale value and the second gray scale value is the median of the gray scale values; and

the default gray scale value is selected from the first gray scale value or the second gray scale value.

9. The driving method of the display device according to claim 7, further comprising:

in the first state, driving the display panel to display a background portion of the image frame with a lowest gray scale value, wherein the gray scale value includes a first gray scale value, a second gray scale value and the lowest gray scale value, and the first gray scale value and the second gray scale value are greater than the lowest gray scale value, an arithmetic mean of the first gray scale value and the second gray scale value is a median of the gray scale values,

wherein the default grayscale value is greater than or equal to the lowest grayscale value, and the default grayscale value is less than the first grayscale value or the second grayscale value.

10. The driving method of the display device according to claim 7, further comprising:

in the first state, driving the display panel to display a background portion of the image frame with a highest grayscale value, wherein the grayscale value includes a first grayscale value, a second grayscale value and the highest grayscale value, and the first grayscale value and the second grayscale value are less than the highest grayscale value, an arithmetic mean of the first grayscale value and the second grayscale value is a median of the grayscale values,

wherein the default grayscale value is less than or equal to the highest grayscale value, and the default grayscale value is greater than the first grayscale value or the second grayscale value.

11. The method for driving a display device according to claim 7, wherein the standby frame includes a checkerboard pattern including a plurality of pixel blocks, and each of the pixel blocks includes at least one pixel, and the step of driving the display panel at the default gray-scale value in the second state to display the standby frame includes:

driving a portion of the pixel blocks with the default grayscale values to display the standby frame, wherein the pixel blocks driven with the default grayscale values are not adjacent in a horizontal direction and a vertical direction.

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