CN114495840A - Display device and driving method thereof - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000000694 effects Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 230000016776 visual perception Effects 0.000 description 4
- 241001270131 Agaricus moelleri Species 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 241001248531 Euchloe <genus> Species 0.000 description 1
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
- G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
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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
Technical Field
The present invention relates to an electronic device and a driving method thereof, and more particularly, to a display device and a driving method thereof.
Background
In recent years, electronic paper display devices have been widely used in electronic readers (e.g., electronic books, electronic newspapers) or other electronic components (e.g., electronic tags) due to their advantages of being light, thin, durable, and low power consumption, which is energy-saving and environmentally friendly. However, for example, in a flexible electronic paper display device, after the flexible electronic paper display device is bent (folded) or rolled (rolled) for a long time or for multiple times, the performance of the display panel may be reduced due to a mechanical fatigue effect. Therefore, when the performance of the display panel is degraded due to the mechanical fatigue effect, the gray scale or color of the pixel may be different from that of the surrounding area. The user may perceive such a difference in the normal display state and feel unevenness (mura) of the image frame, thereby degrading the user experience thereof.
Disclosure of Invention
The invention provides a display device and a driving method thereof, which can display uniform image frames and 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 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 a standby (standby) frame with a 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 an embodiment of the invention, the gray scale values include a first gray scale value and a second gray scale value, and an arithmetic mean of the first gray scale value and the second gray scale value is a median of the gray scale values. The default gray level value is selected from the first gray level value or the second gray level value.
In an embodiment of the invention, the gray scale values include a first gray scale value and a second gray scale value, and an arithmetic mean of the first gray scale value and the second gray scale value is a median of the gray scale values. The gray scale values also include the lowest gray scale value. In a first state, the display driver drives the display panel to display a background portion of the image frame at the lowest grayscale value. The first gray scale value and the second gray scale value are larger than the lowest gray scale value. The default gray level value is greater than or equal to the lowest gray level value, and the default gray level value is less than the first gray level value or the second gray level value.
In an embodiment of the invention, the gray scale values include a first gray scale value and a second gray scale value, and an arithmetic mean of the first gray scale value and the second gray scale value is a median of the gray scale values. The gray scale values also include a highest gray scale value. In a first state, the display driver drives the display panel to display a background portion of the image frame at a highest grayscale value. The first gray scale value and the second gray scale value are smaller than the highest gray scale value. 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.
In an embodiment of the invention, the display driver is further configured to calculate a gray-scale average value of each pixel on the display panel, and determine the default gray-scale value according to the gray-scale average value of each pixel.
In an embodiment of the invention, the standby frame includes a checkerboard pattern (dot pattern). The checkerboard pattern includes a plurality of pixel blocks. Each pixel block includes at least one pixel. The display driver drives a part of the pixel blocks to display the standby frame with the default gray-scale value. The pixel blocks driven by the default gray scale values are not adjacent in the horizontal direction and the vertical direction.
The driving method of a display device of the present invention includes: in a first state, driving a 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 of the image frame; and in the second state, driving the display panel to display the standby frame by the default gray-scale value.
In an embodiment of the invention, the gray values include a first gray value and a second gray value, and an arithmetic mean of the first gray value and the second gray value is a median of the gray values. The default gray level value is selected from the first gray level value or the second gray level value.
In an embodiment of the invention, the method for driving a display device further includes driving the display panel to display the background portion of the image frame with the lowest gray-scale value in the first state. The gray scale values include a first gray scale value, a second gray scale value and a lowest gray scale value. The first gray scale value and the second gray scale value are larger than the lowest gray scale value. The arithmetic mean of the first and second gray scale values is the median of the gray scale values. The default gray level value is greater than or equal to the lowest gray level value, and the default gray level value is less than the first gray level value or the second gray level value.
In an embodiment of the invention, the method for driving a display device further includes driving the display panel to display the background portion of the image frame with the highest grayscale value in the first state. The gray scale values include a first gray scale value, a second gray scale value and a highest gray scale value. The first gray scale value and the second gray scale value are smaller than the highest gray scale value. The arithmetic mean of the first and second gray scale values is the median of the gray scale values. 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.
In an embodiment of the invention, the 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 with the default gray-scale value in the flexed state to display the standby frame includes driving a portion of the pixel blocks with the default gray-scale value to display the standby frame. The pixel blocks driven by the default gray scale values are not adjacent in the horizontal direction and the vertical direction.
Based on the above, in the embodiment of the invention, the display driver drives the display panel to display the standby frame in the deflection state with the default gray-scale value, so that the user can be prevented from feeling the unevenness of the image frame in the first state.
Drawings
The accompanying drawings are included to provide a further understanding of the 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 is a schematic view illustrating a flexible electronic paper display device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a state change of a flexible electronic paper display device and a corresponding display frame according to an embodiment of the invention;
fig. 3 is a flowchart illustrating steps of a driving method of a display device according to an embodiment of the present invention;
FIG. 4 is a graph illustrating a relationship between a fatigue period and gray scale degradation of a flexible electronic paper display device according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a standby frame including a checkerboard pattern according to an embodiment of the present invention.
Description of the reference numerals
100 flexible electronic paper display device
110 display driver
120 flexible electronic paper display panel
300 curve of
400 checkerboard pattern
410. 420 pixel block
M100, M120 image frames
M110 Standby frame
S1 Driving signals
S2 image data
S100, S120 non-flexing State
S110, a deflection state
S200, S210, S220 method step
Detailed Description
Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Hereinafter, a flexible electronic paper display device is taken as an exemplary embodiment of the display device, and will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram illustrating a flexible electronic paper display device according to an embodiment of the present invention. Referring to fig. 1, the flexible electronic paper display apparatus 100 of the present 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 the 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 frames displayed on the flexible e-paper display panel 120 may include color images or grayscale images, whose image contents are determined by the image data S2 input to the display driver 110, and may include plain text contents or other non-text contents. The flexible electronic paper display device 100 according to the embodiment of the invention may also be a flexible organic light emitting diode display device or other flexible display devices.
Fig. 2 is a schematic diagram illustrating a state change of a flexible electronic paper display device and a display frame corresponding to the state change according to an embodiment of the invention. Referring to fig. 1 and fig. 2, the state change of the flexible electronic paper display apparatus 100 can be changed from an unflexed state (first state) S100 to a flexed state (second state) S110, and then changed from the flexed state S110 to the unflexed 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-flexing states S100 and S120 are states in which a user reads or views the contents using the flexible electronic paper display device, and therefore the non-flexing states S100 and S120 may be a slightly flexing state, i.e., a first state in which the user can normally read or view the contents. In the non-flexing states S100 and S120, the flexible electronic paper display panel 120 may be set to be in a flat, non-flexing or non-rolling state. In the non-flexing states S100 and S120, the display driver 110 drives the flexible electronic paper display panel 120 to display the image frames M100 and M120 respectively according to at least one of the gray scale values. The image content of the image frames M100, M120 may be the same or different, and may include plain text content or other non-textual content, depending on the image data S2 input to the display driver 110. The gray scale range for driving the flexible electronic paper display panel 120 may be from 0 to 15, or from 0 to 127, or from 0 to 255. The gray scale range is not intended to limit the present invention.
On the other hand, the flexing state S110 is a state in which the flexible electronic paper display apparatus 100 is in a standby state when the user does not use the flexible electronic paper display apparatus 100, for example, the storage state. In the flexed state S110, the flexible electronic paper display panel 120 may be set to be in an uneven, flexed or rolled state. In the flexing state S110, the display driver 110 drives the flexible electronic paper display panel 120 to display the standby frame M110 according to the default gray scale value. The display driver 110 determines a default gray level value according to the gray levels 0-15, 0-127, or 0-255. The standby frame M110 may be a gray frame in which gray scale values are all the same. Alternatively, the standby frame M110 may include a checkerboard pattern.
Fig. 3 is a flowchart illustrating a driving method of a display device according to an embodiment of the present invention. Referring to fig. 1 and fig. 3, the driving method of the present embodiment is, for example, suitable for the display apparatus 100 of fig. 1. 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 gray-scale values. In step S210, a default gray level value is determined according to the gray level values 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 according to the determined default gray-scale value.
In addition, the driving method of the display device of the present embodiment can obtain sufficient teaching, suggestion and implementation description from the description of the embodiments of fig. 1 to 2.
In the embodiments of fig. 1 to 3, the display driver 110 determines a default gray scale value of the standby frame according to the gray scale values of the image frame. Various embodiments for determining the default grayscale value for the standby frame are described below.
[ first embodiment ]
In the non-deflection state, the display driver 110 drives the flexible electronic paper display panel 120 to display image frames with a gray scale value of 0-15, for example. In this embodiment, in the flexed state, the display driver 110 may select the first gray scale value 7 or the second gray scale value 8 to drive the flexible electronic paper display panel 120 to display the standby frame. That is, the default gray level is selected from the first gray level 7 or the second gray level 8, and the gray levels 0-15 include the first gray level 7 and the second gray level 8. The arithmetic mean 7.5 of the first and second gray scale values 7 and 8 is a median of the gray scale values 0-15.
Fig. 4 is a graph illustrating a relationship between a fatigue period and gray scale degradation of a flexible electronic paper display device according to an embodiment of the invention. Referring to fig. 4, the vertical axis of fig. 4 shows that the gray scale value for driving the flexible electronic paper display panel 120 to display the image frame is 0 to 15, wherein the default gray scale value for driving the flexible electronic paper display panel 120 to display the standby frame is, for example, 8. The horizontal axis of fig. 4 represents the number of times of mechanical fatigue (i.e., fatigue cycle) that the flexible electronic paper display device 100 undergoes during repeated flexing or winding, which is fifty thousand times (50k), ten thousand times (100k), and twenty thousand times (200k), respectively.
In this embodiment, the 16-gray-scale monochrome flexible electronic paper display device 100 takes the frame with the default gray scale value of 8 as the standby frame in the flexing state. Therefore, the standby frame is a gray frame in which gray scale values are all the same. In the present embodiment, the gray scale value 0 is defined as a black frame, and the gray scale value 15 is defined as a white frame. In one embodiment, a frame with a grayscale value of 7 may also be defaulted as a standby frame in the flexed state. When the flexible electronic paper display device 100 suffers from mechanical fatigue effect during repeated flexing or rolling, and the performance of the flexible electronic paper display panel 120 deteriorates, resulting in a decrease in driving capability, the performance deterioration is shown as a curve 300. Since the standby frame of the flexible electronic paper display apparatus 100 is a frame of a gray scale value of 8, the maximum gray scale difference from the image frame of black (gray scale value 0) or the image frame of white (gray scale value 15) is 7-8 gray scales. The maximum gray-scale difference between the standby frame and the image frame is within 7-8 gray scales, so that the phenomenon that human visual perception is not uniform in the image frame in a non-flexing state can be avoided, and good user experience can be provided. That is, when the display is in a flexed or rolled state, the electronic paper is standby in a specific frame, and after the ink performance of the electronic paper subjected to the mechanical fatigue effect is degraded, the difference between the specific standby frame and the surrounding display elements is small, so that the human eyes are difficult to judge the difference, and the human visual perception can be prevented from being subjected to the unevenness of the image frame in the unflexed state.
For example, the mechanical strength of the ink in the electronic ink layer is in a certain gaussian distribution during the manufacturing process. Therefore, most of the electronic paper ink in the bending region, which is subjected to fatigue effect but has not yet been damaged in driving ability, can be normally driven to the gray level 15 when being driven to the white frame. In the bending area, the other small portion of the electronic paper ink deteriorated by fatigue effect can only be driven to the gray level 14 when being driven to the white frame, so that compared with the adjacent undamaged electronic ink, the electronic paper ink has only one gray level difference, and the quantity of the electronic paper ink is far less than that of the undamaged electronic ink, thereby preventing the human visual perception from feeling that the frame is not uniform. Vice versa, if the electronic ink in the inflection region is driven to the black frame, most of the electronic ink is subjected to the fatigue effect, but the driving capability of the electronic paper ink which is not damaged yet has only one gray level difference with the adjacent electronic paper ink which is partially subjected to the fatigue effect and has the deteriorated driving capability, so that the phenomenon that the frame is not uniform by the human visual perception can be avoided. In one embodiment, the 128-gray scale monochrome flexible electronic paper display device 100 takes a frame with a default gray scale value of 63 or 64 as a standby frame in the flexing state. In another embodiment, the 256 gray-scale black-and-white flexible electronic paper display apparatus 100 takes a frame with a default gray scale value of 127 or 128 as a standby frame in the flexing state.
[ second embodiment ]
In the embodiment, taking the 16-gray-scale black-and-white flexible electronic paper display apparatus 100 as an example, when the usage situation of the flexible electronic paper display apparatus 100 is a dark background, the default gray scale value of the standby frame of the flexible electronic paper display apparatus 100 in the flexed state may be set to be one of 0 to 8. For example, in the unflexed state, the display driver 110 drives the flexible electronic paper display panel 120 to display the background portion of the image frame with the lowest gray-scale value of 0 (i.e. the gray-scale value of the background portion of the image frame is 0), while in the flexed state, the gray-scale value of the standby frame may be set to 0. Therefore, when the usage situation 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 0, and the default grayscale value is less than the second grayscale value 8.
In another embodiment, the default gray level value of the standby frame of the flexible electronic paper display apparatus 100 in the flexed state can be set to one of 0 to 7. Therefore, when the usage situation 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 0, and the default grayscale value is less than the first grayscale value 7.
On the other hand, in the embodiment, when the usage situation of the flexible electronic paper display apparatus 100 is a light background, the default gray level value of the standby frame of the flexible electronic paper display apparatus 100 in the flexed state may 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 with the highest grayscale value of 15 (i.e. the grayscale value of the background portion of the image frame is 15), while in the flexed state, the grayscale value of the standby frame may be set to 15. Therefore, when the usage situation of the flexible electronic paper display device 100 is a light background, the default grayscale value is less than or equal to the highest grayscale value 15, and the default grayscale value is greater than the first grayscale value 7.
In another embodiment, the default gray scale value of the standby frame of the flexible electronic paper display apparatus 100 in the flexed state can be set to one of 8-15. Therefore, when the usage situation of the flexible electronic paper display device 100 is a light background, the default grayscale value is less than or equal to the highest grayscale value 0, and the default grayscale value is greater than the second grayscale value 8.
[ third embodiment ]
In the present 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, the display driver 110 counts the gray scale or color displayed by each pixel during the use process according to the use status of the flexible electronic paper display device 100, and calculates the average gray scale value displayed by each pixel, and the average gray scale value is set as the default gray scale value of the standby frame.
For example, in an application of the electronic book reader, taking the 16-gray scale black-and-white flexible electronic paper display device 100 as an example, in the unflexed state, the peripheral region of the image frame mainly displays a white background, and the middle region mainly displays black-and-white background. Therefore, in the deflection state, the default gray scale value of the peripheral area of the standby frame can be set to 15, and the default gray scale value of the middle area can be set to 6-9.
[ fourth embodiment ]
Fig. 5 is a schematic diagram of a standby frame including a checkerboard pattern according to an embodiment of the present invention. Referring to fig. 5, the standby frame M110 of the present embodiment includes a checkerboard pattern 400. The checkerboard pattern 400 includes a plurality of pixel blocks 410, 420. Each pixel block includes at least one pixel. For example, each pixel block includes 1-5 pixels. In the present embodiment, the display driver 110 drives a portion of the pixel block to display the standby frame M110 with the default gray-scale value. For example, taking the 16-gray-scale black-and-white flexible electronic paper display device 100 as an example, the display driver 110 drives the pixel block 410 to display a darker block in the standby frame M110 with a default gray scale value of 0. The pixel blocks 410 driven with the default grayscale value of 0 are not adjacent in the horizontal and vertical directions. Similarly, the display driver 110 drives the pixel block 420 with the default grayscale value of 15 to display the lighter color block in the standby frame M110. The pixel blocks 420 driven at the default grayscale value of 15 are not adjacent in the horizontal and vertical directions. Therefore, the pixel blocks 410, 420 are uniformly distributed on the standby frame M110 to form the checkerboard pattern 400.
In the embodiment, since the flexible electronic paper display panel 120 is driven by the uniformly distributed pixel blocks 410 and 420 as the standby frame M110 in the flexing state, even if the performance of the flexible electronic paper display panel 120 is degraded due to the mechanical fatigue effect, the user may experience the uneven image frames in the non-flexing state, thereby providing a good user experience. For example, in the checkerboard standby frame, the distribution probability of the electronic ink potentially damaged by fatigue effect in the black and white pixel regions is half, so that the user feels that the image frame is not uniform when using the standby frame with gray level 15 or gray level 0.
[ fifth embodiment ]
Taking the color flexible electronic paper display device as an example, the display driver 110 drives the flexible electronic paper display panel 120 with light gray scale to display the standby frame in the flexing state. In the gray scale range of 0-15, the light gray scale is a gray scale 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 e-paper display panel 120 is degraded due to the mechanical fatigue effect, the light gray failed pixels are easily rendered by the normal pixels around the failed pixels, so that the user may also reduce the non-uniform feeling of the image frame in the non-flexing state. For example, human perception of color is limited by the adaptive ability of color (chromatic adaptation), brightness (Luminance), and area of an object (area). In terms of color adaptability, white is most susceptible to ambient color. For example, when a small white dot is surrounded by red, human eyes determine a slightly light red color but not a little white color and a little red color, which is the rendering effect. In terms of brightness, the human eye cannot perceive its presence when the brightness is insufficient, and thus a light gray reduces the brightness to make the pixel less noticeable when it gradually fails. In terms of the object area, the human eye cannot detect the presence of the failed pixel when the object area is small.
Therefore, the display driver 110 can determine the default gray level at least according to one of the first to fifth embodiments, although the invention is not limited to the above five manners.
In summary, in the embodiments of the invention, the display driver determines the default gray-scale value according to the gray-scale values of the image frames. And driving the flexible electronic paper display panel to display the standby frame by the determined default gray level value in the flexible state display driver. Therefore, the user can be prevented from feeling the unevenness of the image frame in the non-flexing state.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
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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