JP7332603B2 - Display driving device and sub-pixel driving method - Google Patents

Description

This application claims the priority of the Chinese patent application with application number 201810939798.4, titled "Display driving device and sub-pixel driving method" filed on August 17, 2018, incorporated herein by reference.

[Technical field]
The present invention relates to image processing technology, and more particularly to a display driving device and sub-pixel driving method.

Image quality is related to the viewer's viewing angle when viewing an image displayed on a display screen. For example, the image quality is best when the viewing angle of the observer is along the normal direction of the display screen surface. As the viewing angle deviates from the normal direction, the image quality becomes progressively worse. The main reason for the degradation in image quality is color artifacts, i.e., when the viewing angle deviates from the normal direction, the red, green and blue sub-pixels all decrease in brightness, but to different extents, so that the viewer's Perceived colors deviate from predetermined values, thereby creating color artifacts.

The problem of color artifacts described above not only exists when viewing images at high viewing angles, but also exists in low power modes of the display screen. The display screen drive circuitry may be configured to operate in a normal display mode and a low power mode and use different display drive channels to process display data. In the low power mode of the display screen, the display data represented by multi-bits can be converted to the display data represented by 1-bit, and the luminance value of each sub-pixel is set to 1 or 0, thereby rendering the color The image is converted to a grayscale image represented by sub-pixels of maximum grayscale and minimum grayscale. A viewer perceives red, green, and blue sub-pixels to have different luminance changes. Even if the viewing angle does not change, the colors perceived by the observer will deviate from the predetermined values, thereby also creating color artifacts.

Color artifacts can be reduced by performing sub-pixel rendering (SPR) on the display data. In the normal display mode, the SPR drive channel is a pixel unit containing multiple subpixel repeating units, a subpixel repeating unit containing one or two subpixels. Sub-pixel rendering can not only improve the image quality at large viewing angles, but also expand the viewing angle range of the display screen. However, sub-pixel rendering can introduce new problems, such as color edges at the edges of the image and color artifacts in local regions of the image.

Therefore, it is expected to further improve the sub-pixel driving method so as to balance power consumption control and image quality of the display screen.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to obtain equivalent intermediate grayscales by dithering a plurality of sub-pixels in consecutive frame periods to suppress the occurrence of color artifacts.

According to a first aspect of the present invention, there is provided a sub-pixel driving method for a display screen, said display screen comprising a plurality of pixel units, said plurality of pixel units each arranged in a pixel structure to display different colors. wherein the method comprises: converting a color image signal into a grayscale image signal represented by a minimum grayscale and a maximum grayscale; and based on the pixel structure, along the row direction selecting a sub-pixel repeating unit including a plurality of sub-pixels arranged, and data dithering using interior sub-pixels and adjacent exterior sub-pixels of said sub-pixel repeating unit for a plurality of consecutive frame periods. and converting the grayscale image signal to a rendered image signal, wherein subpixels of the rendered image signal have equivalent intermediate grayscales produced by data dithering; and driving the plurality of sub-pixels using.

Preferably, the pixel structure is an array structure including a row direction and a column direction, and the step of selecting a sub-pixel repeating unit includes determining the sub-pixel repeating unit along the row direction; obtaining a quantity ratio S between a unit and an equivalent pixel unit, said equivalent pixel unit comprising a set of sub-pixels for displaying three colors of red, green and blue.

Preferably, the dithering period of the data dithering includes a plurality of consecutive frame periods, and further comprising obtaining the dithering period between the step of obtaining the quantity ratio S and the step of data dithering. , the product of the number N of frames in the plurality of frame periods and the quantity ratio S is an integer of 1 or more.

Preferably, the number ratio S of said sub-pixel repeating units is one of 1/2, 1/3, 2/3, and the number of frames N of said dithering period is a corresponding one of 2, 6, 6. and the equivalent intermediate grayscales are corresponding ones of 1/2, 1/3 and 2/3 of the maximum grayscale.

Preferably, said exterior sub-pixels are adjacent sub-pixels on one or both sides of said sub-pixel repeating unit, said exterior sub-pixels complementing sub-pixels of colors not included in said sub-pixel repeating unit.

Preferably, in the step of data dithering, at least one sub-pixel of inner sub-pixels and outer sub-pixels of said sub-pixel repeating unit is independent of an image signal in at least one frame period of said plurality of frame periods. is maintained at minimum grayscale.

Preferably, the data dithering reduces display screen power consumption and suppresses color artifacts.

According to a second aspect of the present invention, a first drive channel for processing received color image signals into first drive signals and a second drive channel for processing received color image signals into second drive signals. and a selection unit for selecting one of the first driving channel and the second driving channel based on the first mode and second mode selection signals of the display screen, wherein , the power consumption of the second mode of the display screen is less than the power consumption of the first mode, and the second drive channel dithers the image signal in a plurality of successive frame periods to obtain an equivalent intermediate grayscale. process the ring.

Preferably, the second drive channel includes a data conversion module for converting the color image signal into a grayscale image signal represented by a minimum grayscale and a maximum grayscale; a data dithering module for dithering the grayscale image signal to produce an image signal; and for selecting one of a minimum grayscale and a maximum grayscale based on a binary value of the rendered image signal. wherein the sub-pixels of the rendered image signal have equivalent intermediate grayscales produced by dithering the data.

According to the display driving apparatus and sub-pixel driving method according to the embodiments of the present invention, a plurality of adjacent sub-pixels are used as a pixel repetition unit, and a plurality of successive frame periods are used to obtain an equivalent intermediate gray scale. dithering. The consecutive multiple frame periods constitute a dithering period. The low power mode of the display screen converts the color image to a grayscale image represented by full grayscale and intermediate grayscale sub-pixels. The improved sub-pixel rendering not only lowers the equivalent luminance value of sub-pixels in low power mode, further reducing power consumption, but also reduces the difference in luminance values of sub-pixels of different colors perceived by the observer. reduced, thus helping to reduce the occurrence of color artifacts.

The above and additional objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the drawings. In the drawing:

FIG. 1 shows a schematic block diagram of a display driving device according to the present invention. FIG. 2 shows a flowchart of a sub-pixel driving method according to the present invention. FIG. 3a shows a schematic diagram of the pixel structure and pixel diffusion type of a display screen of the first type. FIG. 3b shows a schematic diagram of the pixel structure and pixel diffusion type of the display screen of the first type. FIG. 4a shows a schematic diagram of the first sub-pixel repeating unit of the sub-pixel driving method according to the first embodiment of the present invention. FIG. 4b shows a schematic diagram of the first sub-pixel repeating unit of the sub-pixel driving method according to the first embodiment of the present invention. FIG. 5a shows a schematic diagram of a second sub-pixel repeating unit of the sub-pixel driving method according to the first embodiment of the present invention. FIG. 5b shows a schematic diagram of the second sub-pixel repeating unit of the sub-pixel driving method according to the first embodiment of the present invention. FIG. 6a shows a schematic diagram of the third sub-pixel repeating unit of the sub-pixel driving method according to the first embodiment of the present invention. FIG. 6b shows a schematic diagram of the third sub-pixel repeating unit of the sub-pixel driving method according to the first embodiment of the present invention. FIG. 7a shows a schematic diagram of the first sub-pixel repeating unit of the sub-pixel driving method according to the second embodiment of the present invention. FIG. 7b shows a schematic diagram of the first sub-pixel repeating unit of the sub-pixel driving method according to the second embodiment of the present invention. FIG. 8a shows a schematic diagram of a second sub-pixel repeating unit of the sub-pixel driving method according to the second embodiment of the present invention. FIG. 8b shows a schematic diagram of the second sub-pixel repeating unit of the sub-pixel driving method according to the second embodiment of the present invention. FIG. 9a shows a schematic diagram of the third sub-pixel repeating unit of the sub-pixel driving method according to the second embodiment of the present invention. FIG. 9b shows a schematic diagram of the third sub-pixel repeating unit of the sub-pixel driving method according to the second embodiment of the present invention. FIG. 10a shows a schematic diagram of the pixel structure and pixel diffusion type of the second type display screen. FIG. 10b shows a schematic diagram of the pixel structure and pixel diffusion type of the second type display screen. FIG. 11 shows a schematic diagram of a sub-pixel repeating unit of the sub-pixel driving method according to the third embodiment of the present invention. FIG. 12a shows a schematic diagram of the pixel structure and pixel diffusion type of the third type display screen. FIG. 12b shows a schematic diagram of the pixel structure and pixel diffusion type of the third type display screen. FIG. 13 shows a schematic diagram of the first sub-pixel repeating unit of the sub-pixel driving method according to the fourth embodiment of the present invention. FIG. 14 shows a schematic diagram of the second sub-pixel repeating unit of the sub-pixel driving method according to the fourth embodiment of the present invention. FIG. 15 shows a schematic diagram of the third sub-pixel repeating unit of the sub-pixel driving method according to the fourth embodiment of the present invention. FIG. 16a shows a schematic diagram of the pixel structure and pixel diffusion type of a display screen of the fourth type. FIG. 16b shows a schematic diagram of the pixel structure and pixel diffusion type of the fourth type display screen. FIG. 16c shows a schematic diagram of the pixel structure and pixel diffusion type of the fourth type display screen. FIG. 17 shows a schematic diagram of the first sub-pixel repeating unit of the sub-pixel driving method according to the fifth embodiment of the present invention. FIG. 18 shows a schematic diagram of the second sub-pixel repeating unit of the sub-pixel driving method according to the fifth embodiment of the present invention. FIG. 19a shows a schematic diagram of the pixel structure and pixel diffusion type of the fifth type display screen. FIG. 19b shows a schematic diagram of the pixel structure and pixel diffusion type of the fifth type display screen. FIG. 19c shows a schematic diagram of the pixel structure and pixel diffusion type of the fifth type display screen. FIG. 20 shows a schematic diagram of the first sub-pixel repeating unit of the sub-pixel driving method according to the sixth embodiment of the present invention. FIG. 21 shows a schematic diagram of the second sub-pixel repeating unit of the sub-pixel driving method according to the sixth embodiment of the present invention.

Various embodiments of the invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are designated with the same or similar reference numerals. For clarity, parts of the drawings are not drawn to scale.

The invention will now be further described with reference to the accompanying drawings and examples.

FIG. 1 shows a schematic block diagram of a display driving device according to the present invention. The display driving device 100 is configured to drive a display screen, which comprises a plurality of pixel units each including a plurality of sub-pixels for displaying different colors. The display driving device 100 comprises a selection unit 101 , a first driving channel 110 and a second driving channel 120 .

The selection unit 101 selects one of the first driving channel 110 and the second driving channel 120 according to the mode selection signal of the display screen. The first driving channel 110 and the second driving channel 120 respectively process the received image signal into a first driving signal and a second driving signal in the normal display mode and the low power mode of the display screen.

The first driving channel 110 includes a first voltage conversion module 111 , a mode evaluation module 112 , a pixel compensation module 113 and a second voltage conversion module 114 . The first voltage conversion module 111 converts the nonlinear gamma image signal into a linear image signal. Mode evaluation module 112 may, for example, perform edge detection on the image. Pixel compensation module 113 compensates for edge information in the image, eg, to improve image quality. The second voltage conversion module 114 reconverts the linear image signal into a non-linear gamma image signal as the first driving signal.

The second driving channel includes a data conversion module 121 , a data dithering module 122 and a voltage selection module 123 . The data conversion module 121 converts the received color image signal into a grayscale image signal represented by a minimum grayscale and a maximum grayscale. The data dithering module 122 performs a dithering process on the grayscale image signal for a plurality of successive frame periods, converting the grayscale image signal into a rendered image signal, wherein sub-pixels of the rendered image signal contain data. There are equivalent intermediate grayscales produced by dithering. The voltage selection module 123 selects one of the minimum grayscale and the maximum grayscale according to the binary value of the rendered image signal to obtain a second driving signal for driving the plurality of sub-pixels of the display screen.

A display driver according to an embodiment of the present invention converts a color image into a grayscale image represented by full grayscale and intermediate grayscale sub-pixels in the low power mode of the display screen. The data dithering module performs a dithering process to obtain equivalent intermediate grayscales during successive frame periods, reducing equivalent luminance values of sub-pixels in low power mode and further reducing power consumption. Not only can it be reduced, but the difference in luminance values of sub-pixels of different colors perceived by an observer is correspondingly reduced, thus helping to suppress the occurrence of color artifacts.

FIG. 2 shows a flowchart of a sub-pixel driving method according to the present invention.

In step S01, the received color image signal is converted into a grayscale image signal represented by a minimum grayscale and a maximum grayscale. In this step, for example, the image signals required for the low power mode of the display screen are generated.

In step S02, a sub-pixel repeating unit is selected based on the pixel structure of the display screen. A pixel structure is an array structure including row and column directions. For example, subpixel repeat units are determined along the row direction.

In such an embodiment, the interior subpixels of a subpixel repeating unit include, for example, a set of subpixels that are only part of red, green, and blue. The interior sub-pixels of a sub-pixel repeating unit and its adjacent exterior sub-pixels can be organized into equivalent pixel units. An equivalent pixel unit contains a set of red, green, and blue sub-pixels.

The quantity ratio S of a subpixel repeat unit is the ratio to its equivalent pixel unit. For example, if three adjacent sub-pixel repeating units contain two equivalent pixel units, the quantity ratio is S=2/3.

In step S03, during a plurality of consecutive frame periods, data dithering is performed using internal sub-pixels and adjacent external sub-pixels of the sub-pixel repeating unit to convert the grayscale image signal into a rendering image signal; Sub-pixels of the rendered image signal have equivalent intermediate grayscales produced by data dithering.

The exterior subpixels used for data dithering are adjacent subpixels on one or both sides of said subpixel repeating unit, said exterior subpixels complementing subpixels of colors not included in said subpixel repeating unit. .

A dithering period Td employed for data dithering includes a plurality of consecutive frame periods Tf. For example, the dithering period Td is obtained based on the quantity ratio S of the sub-pixel repeating units. The product of the number N of frames included in the dithering period Td and the quantity ratio S is an integer of 1 or more.

For example, the quantity ratio S of sub-pixel repeating units is one of 1/2, 1/3, and 2/3, and the number of frames N in the dithering period is a corresponding one of 2, 6, and 6; Said equivalent intermediate grayscales are corresponding ones of 1/2, 1/3 and 2/3 of the maximum grayscale.

In step S04, the rendered image signal is used to drive a plurality of sub-pixels of the display screen.

According to the sub-pixel driving method according to the embodiment of the present invention, the dithering process is performed so as to obtain an equivalent intermediate grayscale in successive frame periods, and the equivalent sub-pixel in the low power mode is obtained. The luminance value can be lowered to further reduce power consumption, and the difference between sub-pixel luminance values of different colors perceived by an observer is correspondingly reduced, thereby helping to suppress the occurrence of color artifacts.

Figures 3a and 3b show schematic diagrams of pixel structures and pixel diffusion types of a first type display screen.

As shown in FIG. 3a, the width W of subpixel repeating units 201-203 is each two subpixels wide. Taking the subpixel repeating unit 201 as an example, the first row of subpixel repeating units 201 includes one red and one green adjacent subpixel, and the second row of subpixel repeating units 201 has one intermediate blue subpixel. , and adjacent 1/2 green and 1/2 red sub-pixels, and so on. Thus, in each row, three subpixel repeating units adjacent to each other include two red subpixels, two green subpixels and two blue subpixels.

As shown in FIG. 3b, the sub-pixel repeating units 201-203 of the first row are double-sided diffused, ie, the sub-pixel repeating unit is dithered with the neighboring sub-pixel units on both sides, and the sub-pixel repeating units of the second row Pixel repeating units 201-203 are unilaterally diffused, ie, a subpixel repeating unit is dithered with its neighboring subpixel units on one side, and so on.

In the embodiment, the quantity ratio of the sub-pixel repeating unit 201 is S=2/3, the number of frames in the dithering period Td is N=6, and the product of the quantity ratio S and the number of frames N is an integer 4 . .

4a and 4b show schematic diagrams of a first sub-pixel repeating unit of the sub-pixel driving method according to the first embodiment of the present invention. The sub-pixel driving method is used, for example, in the first type of display screen shown in Figures 3a and 3b.

As shown in FIG. 4a, the double-sided data dithering is described by taking the sub-pixel repeating unit 201 of the first row as an example. The first row of subpixel repeating unit 201 includes red subpixel R11 and green subpixel G11 adjacent to each other on one side. On the other side of red sub-pixel R11 is blue sub-pixel B11, and on the other side of green sub-pixel G11 is blue sub-pixel B12. For six consecutive frame periods, frames 0 to 5, the red sub-pixel R11 is lit for four frame periods, frame 0, frame 1, frame 4 and frame 5, and the green sub-pixel G11 is lit for four frame periods of the frame period. The blue sub-pixel B11 is lit in two frame periods, frame 0 and frame 5 of the frame period, and the blue sub-pixel B12 is the frame of the frame period. 2 and frame 3 are illuminated. Thus, two subpixels and two adjacent subpixels of the subpixel repeating unit 201, for a total of four subpixels, have an equivalent grayscale of 2/3 of the maximum grayscale in six consecutive frame periods; This achieves a medium grayscale.

As shown in FIG. 4b, the data dithering with unilateral spreading is explained by taking the sub-pixel repeating unit 201 of the second row as an example. From the second row of subpixel repeating unit 201, select green subpixel G21 and blue subpixel B21 adjacent to each other on one side. On the other side of blue subpixel B21 is red subpixel R21 . In frame 0-frame 5 of the 6 consecutive frame periods, the green sub-pixel G21 is illuminated during 4 frame periods of frame periods frame 0, frame 2, frame 3 and frame 5, and the blue sub-pixel B21 is illuminated during frame 0, frame 2, frame 3 and frame 5. The red sub-pixel R21 is illuminated during a total of four frame periods, frame 0, frame 1, frame 3, and frame 4, and the red sub-pixel R21 is lit during a total of four frame periods, frame periods frame 1, frame 2, frame 4, and frame 5. Light. Thus, the two subpixels and one adjacent subpixel of the subpixel repeating unit 201, for a total of three subpixels, have an equivalent grayscale of 2/3 of the maximum grayscale for six consecutive frame periods. , to achieve a medium grayscale.

5a and 5b show schematic diagrams of the second sub-pixel repeating unit of the sub-pixel driving method according to the first embodiment of the present invention. The sub-pixel driving method is used, for example, in the first type of display screen shown in Figures 3a and 3b.

As shown in FIG. 5a, the double-sided data dithering is described by taking the sub-pixel repeating unit 202 of the first row as an example. The first row of subpixel repeating unit 202 includes blue subpixel B11 and red subpixel R11 adjacent to each other on one side. On the other side of the blue sub-pixel B11 is the green sub-pixel G11 and on the other side of the red sub-pixel R11 is the green sub-pixel G12. In frames 0 to 5 of 6 consecutive frame periods, the blue sub-pixel B11 is illuminated for a total of 4 frame periods of frame periods frame 0, frame 1, frame 4 and frame 5, and the red sub-pixel R11 is illuminated. The green sub-pixel G11 is lit for a total of two frame periods from frame 0 to frame 5 of the frame period, and the green sub-pixel G12 is lit for the frame period. is lit during a total of two frame periods, frame 2 and frame 3. Thus, two subpixels and two adjacent subpixels of the subpixel repeating unit 202, for a total of four subpixels, have an equivalent grayscale of 2/3 of the maximum grayscale in six consecutive frame periods; A medium gray scale was achieved.

As shown in FIG. 5b, the data dithering with unilateral diffusion is illustrated by taking the second row sub-pixel repeating unit 202 as an example. From the second row of subpixel repeating unit 202, select red subpixel R21 and green subpixel G21 adjacent to each other on one side. On the other side of green subpixel G21 is blue subpixel B21. In frame 0 to frame 5 of 6 consecutive frame periods, the red sub-pixel R21 is illuminated for a total of 4 frame periods of frame period frame 0, frame 2, frame 3 and frame 5, and the green sub-pixel G21 is illuminated. The blue sub-pixel B21 is illuminated during four frame periods, frame 0, frame 1, frame 3, and frame 4 of the frame period, and the blue sub-pixel B21 is lit during four frame periods, frame 1, frame 2, frame 4, and frame 5 of the frame period. Light. Thus, two subpixels and one adjacent subpixel of the subpixel repeating unit 202, for a total of three subpixels, have an equivalent grayscale of 2/3 of the maximum grayscale in six consecutive frame periods; A medium gray scale was achieved.

6a and 6b show schematic diagrams of the third sub-pixel repeating unit of the sub-pixel driving method according to the first embodiment of the present invention. The sub-pixel driving method is used, for example, in the first type of display screen shown in Figures 3a and 3b.

As shown in FIG. 6a, the double-sided data dithering is described by taking the sub-pixel repeating unit 203 of the first row as an example. The first row of subpixel repeating unit 203 includes green subpixel G11 and blue subpixel B11 adjacent to each other on one side. On the other side of green sub-pixel G11 is red sub-pixel R11, and on the other side of blue sub-pixel B11 is red sub-pixel R12. In frames 0 to 5 of 6 consecutive frame periods, the green sub-pixel G11 is illuminated for a total of 4 frame periods of frame periods frame 0, frame 1, frame 4 and frame 5, and the blue sub-pixel B11 is illuminated. The red sub-pixel R11 is lit during a total of two frame periods, frames 0 and 5 of the frame period, and the red sub-pixel R12 is lit during the frame period. is lit during a total of two frame periods, frame 2 and frame 3. Thus, two subpixels and two adjacent subpixels of the subpixel repeating unit 203, for a total of four subpixels, have an equivalent grayscale of 2/3 of the maximum grayscale in six consecutive frame periods; A medium gray scale was achieved.

As shown in FIG. 6b, the data dithering with unilateral spreading is illustrated by taking the second row sub-pixel repeating unit 203 as an example. From the second row of subpixel repeating unit 203, select blue subpixel B21 and red subpixel R21 adjacent to each other on one side. On the other side of red sub-pixel R21 is green sub-pixel G21. In frame 0 to frame 5 of the 6 consecutive frame periods, the blue sub-pixel B21 is illuminated for a total of 4 frame periods of frame period frame 0, frame 2, frame 3 and frame 5, and the red sub-pixel R21 is illuminated. The green sub-pixel G21 is illuminated during a total of four frame periods of frame periods frame 0, frame 1, frame 3 and frame 4, and the green sub-pixel G21 is illuminated during a total of four frame periods of frame periods frame 1, frame 2, frame 4 and frame 5. lights up. Thus, two subpixels and one adjacent subpixel of the subpixel repeating unit 203, for a total of three subpixels, have an equivalent grayscale of 2/3 of the maximum grayscale in six consecutive frame periods; A medium gray scale was achieved.

A sub-pixel driving method according to the second embodiment of the present invention is basically the same as the first embodiment. If the number of lighting times of sub-pixels in consecutive frame periods is maintained, the lighting order of sub-pixels in consecutive frame periods is changed. Hereinafter, the differences of the second embodiment will be described with reference to the first embodiment, and the same points of both will not be described in detail.

7a and 7b show schematic diagrams of a first sub-pixel repeating unit of a sub-pixel driving method according to a second embodiment of the present invention.

4a, in double-sided data dithering, as shown in FIG. 7a, the blue sub-pixel B11 is illuminated for a total of two frame periods, frame 0 and frame 1 of the frame period, and the blue sub-pixel B12 is illuminated. is lit for a total of two frame periods of frames 4 and 5 of the frame period, and the number and order of lighting of the red sub-pixel R11 and the green sub-pixel G11 do not change.

Compared to FIG. 4b, as shown in FIG. 7b, in the one-sided diffuse data dithering, the green sub-pixel G21 lights up for a total of four frame periods from frame 1 to frame 4, the blue sub-pixel B21 and the red sub-pixel B21. The sub-pixel R21 is illuminated during a total of four frame periods, frame 0, frame 1, frame 4 and frame 5 of the frame period.

Thus, the two subpixels and one adjacent subpixel of the subpixel repeating unit 201, for a total of three subpixels, have an equivalent grayscale of 2/3 of the maximum grayscale in six consecutive frame periods; A medium gray scale was achieved.

8a and 8b show schematic diagrams of a second sub-pixel repeating unit of a sub-pixel driving method according to a second embodiment of the present invention.

5a, in double-sided data dithering, as shown in FIG. 8a, the green sub-pixel G11 lights up for a total of two frame periods, frame 0 and frame 1 of the frame period, and the green sub-pixel G12 are lit for a total of two frame periods, frame 4 and frame 5 of the frame period, and the lighting times and order of the blue sub-pixel B11 and the red sub-pixel R11 remain unchanged.

Compared to FIG. 5b, as shown in FIG. 8b, in the one-sided diffuse data dithering, the green sub-pixel G21 lights up for a total of four frame periods from frame 1 to frame 4, the red sub-pixel R21 and the blue sub-pixel R21. Sub-pixel B 21 illuminates for a total of four frame periods, frame 0, frame 1, frame 4 and frame 5 of the frame period.

Thus, two subpixels and one adjacent subpixel of the subpixel repeating unit 202, for a total of three subpixels, have an equivalent grayscale of 2/3 of the maximum grayscale in six consecutive frame periods; A medium gray scale was achieved.

Figures 9a and 9b show schematic diagrams of the third sub-pixel repeating unit of the sub-pixel driving method according to the second embodiment of the present invention.

Compared to FIG. 6a, in double-sided data dithering, as shown in FIG. 9a, the red sub-pixel R11 lights up for a total of two frame periods, frame 0 and frame 1 of the frame period, and the red sub-pixel R12 is lit for a total of two frame periods, frame 4 and frame 5, the green sub-pixel G11 is lit for a total of four frame periods, frame 1 to frame 4, and the blue sub-pixel B11 is lit for frames 2 to 4. 5 for a total of four frame periods.

6b, blue sub-pixel B21 lights up for a total of four frame periods from frame 0 to frame 3, and red sub-pixel R21 lights up for frame 1, in single-sided data dithering, as shown in FIG. 9b. to frame 4, and the green sub-pixel G21 is lit during a total of four frame periods from frame 2 to frame 5.

Thus, two subpixels and one adjacent subpixel of the subpixel repeating unit 203, for a total of three subpixels, have an equivalent grayscale of 2/3 of the maximum grayscale in six consecutive frame periods; A medium gray scale was achieved.

Figures 10a and 10b show schematic diagrams of pixel structures and pixel diffusion types of a second type of display screen.

As shown in FIG. 10a, the width W of subpixel repeating units 301 and 302 is each two subpixels wide. Taking the subpixel repeating unit 301 as an example, the subpixel repeating unit 301 in the first row includes one red and one green adjacent subpixel, and the subpixel repeating unit 301 in the second row includes one adjacent red and one green subpixel. 1 blue sub-pixel and 1 green sub-pixel, and so on. Thus, in each row, two subpixel repeating units adjacent to each other include one red subpixel, one blue subpixel and two green subpixels.

In the subpixel repeating unit 301, two adjacent subpixels are adjacent to each other in the row direction (the direction indicated by the arrow in the figure) and are offset by one subpixel height distance in the column direction.

As shown in FIG. 10b, the subpixel repeating units 301 and 302 of the first and second rows are both unilaterally diffused, i. and so on.

In the example, the quantity ratio of the sub-pixel repeating unit 301 is S=1/ 2 , the number of frames in the dithering period Td is N=2, and the product of the quantity ratio S and the number of frames N is an integer 1. be.

FIG. 11 shows a schematic diagram of a sub-pixel repeating unit of the sub-pixel driving method according to the third embodiment of the present invention. The sub-pixel driving method is used, for example, in the second type of display screen shown in Figures 10a and 10b, where the sub-pixel repeating units 301 and 302 are both unilaterally diffuse.

As shown, data dithering with unilateral diffusion is described using the first row sub-pixel repeating unit 301 as an example. From the first row of subpixel repeating unit 301, select red subpixel R11 and green subpixel G11 adjacent to each other on one side. On the other side of green subpixel G11 is blue subpixel B11. In two consecutive frame periods, frame 0 to frame 1, the red sub-pixel R11 is illuminated for a total of one frame period, and the green sub-pixel G11 is illuminated for a total of two frame periods, frame 0 and frame 1 of the frame period. Illuminated, the blue sub-pixel B11 illuminates for one frame period, frame 1 of the frame period. Thus, the two subpixels of the subpixel repeating unit 301 and one adjacent subpixel, for a total of three subpixels, have an equivalent grayscale of 1/2 of the maximum grayscale in two consecutive frame periods; A medium gray scale was achieved.

Figures 12a and 12b show schematic diagrams of pixel structures and pixel diffusion types of a third type of display screen.

Subpixel repeating units 401-403 each have a width W, as shown in FIG. 12a. In each row, three subpixel repeating units adjacent to each other include two red subpixels, two blue subpixels and two green subpixels.

As shown in FIG. 12b, the first and second row subpixel repeating units 401-403 are all unilaterally diffused, ie, the subpixel repeating units are dithered together with the adjacent subpixel units on one side. , and so on.

In the example, the quantity ratio of the sub-pixel repeating unit 401 is S=2/3, the number of frames in the dithering period Td is N=6, and the product of the quantity ratio S and the number of frames N is an integer 4 . be.

FIG. 13 shows a schematic diagram of the first sub-pixel repeating unit of the sub-pixel driving method according to the fourth embodiment of the present invention. The sub-pixel driving method is used, for example, in a display screen of the third type shown in Figures 12a and 12b, in which the sub-pixel repeating unit 401 is unilaterally diffused.

As shown, data dithering with unilateral diffusion is described using the first row sub-pixel repeating unit 401 as an example. From the first row of subpixel repeating unit 401, select blue subpixel B11, red subpixel R11 and green subpixel G11 arranged in a triangle adjacent to each other. On the other side of red sub-pixel R11 is blue sub-pixel B21. In frame 0 to frame 5 of the 6 consecutive frame periods, the red sub-pixel R11 is illuminated for a total of 4 frame periods, frame 0, frame 1, frame 4 and frame 5, and the green sub-pixel is illuminated for frame 0, frame 2, during a total of four frame periods of frames 3 and 4; the blue sub-pixel B11 is lit during a total of two frame periods of frames 1 and 6; Lights up for a total of two frame periods. Thus, the three subpixels and one adjacent subpixel of the subpixel repeating unit 401, for a total of four subpixels, have an equivalent grayscale of 2/3 of the maximum grayscale in six consecutive frame periods; A medium gray scale was achieved.

FIG. 14 shows a schematic diagram of the second sub-pixel repeating unit of the sub-pixel driving method according to the fourth embodiment of the present invention. The sub-pixel driving method is used, for example, in a third type of display screen shown in Figures 12a and 12b, where the sub-pixel repeating unit 402 is unilaterally diffuse.

As shown, data dithering with unilateral spreading is illustrated using the first row of sub-pixel repeating units 402 as an example. From the first row of subpixel repeating unit 402, select blue subpixel B11, red subpixel R11 and green subpixel G11 arranged in a triangle adjacent to each other. On the other side of red sub-pixel R11 is blue sub-pixel B21. In frame 0-frame 5 of the 6 consecutive frame periods, the red sub-pixel R11 is illuminated for a total of 4 frame periods: frame 0, frame 1, frame 4 and frame 5, and the green sub-pixel is lit for frame 1-frame. 4 for a total of four frame periods, the blue sub-pixel B11 is illuminated for a total of two frame periods of frames 0 and 5, and the blue sub-pixel B12 is illuminated for a total of two frame periods of frames 2 and 3. Light. Thus, three subpixels and one adjacent subpixel of the subpixel repeating unit 402, for a total of four subpixels, have an equivalent grayscale of 2/3 of the maximum grayscale in six consecutive frame periods; A medium gray scale was achieved.

FIG. 15 shows a schematic diagram of the third sub-pixel repeating unit of the sub-pixel driving method according to the fourth embodiment of the present invention. The subpixel driving method is used, for example, in a third type of display screen shown in Figures 12a and 12b, where the subpixel repeating unit 403 is unilaterally diffuse.

As shown, data dithering with unilateral diffusion is described using the first row sub-pixel repeating unit 403 as an example. From the first row of subpixel repeating unit 403, select blue subpixel B11, red subpixel R11 and green subpixel G11 arranged in a triangle adjacent to each other. On the other side of red sub-pixel R11 is blue sub-pixel B21. In six consecutive frame periods, frames 0 to 5, the red sub-pixel R11 is lit for a total of four frame periods, frames 1 to 4, and the green sub-pixels are for frames 0, 1, 4 and 4. 5 for a total of four frame periods, the blue sub-pixel B11 is illuminated for a total of two frame periods of frames 2 and 3, and the blue sub-pixel B12 is illuminated for a total of two frame periods of frames 0 and 5. Light. Thus, the three subpixels and one adjacent subpixel of the subpixel repeating unit 403, a total of four subpixels, have an equivalent grayscale of 2/3 of the maximum grayscale in six consecutive frame periods; A medium gray scale was achieved.

Figures 16a-16c show schematic diagrams of pixel structures and pixel diffusion types of a fourth type of display screen.

As shown in FIG. 16a, the width W of subpixel repeating units 501 and 502 is each 1.5 subpixels wide. In each row, two subpixel repeating units adjacent to each other include one red subpixel, one blue subpixel and two green subpixels.

As shown in FIGS. 16b and 16c, both the first and second row subpixel repeat units 501 and 502 are unilaterally diffuse, i.e., the subpixel repeat unit dithers with its neighboring subpixel units on one side. processed, and so on.

In the example, the quantity ratio of the subpixel repeating unit 501 is S=1/ 2 , the number of frames in the dithering period Td is N=2, and the product of the quantity ratio S and the number of frames N is the integer 1. be.

FIG. 17 shows a schematic diagram of the first sub-pixel repeating unit of the sub-pixel driving method according to the fifth embodiment of the present invention. The sub-pixel driving method is used, for example, in a fourth type of display screen shown in FIGS. 16a-16c, in which the sub-pixel repeating unit 501 is unilaterally diffused.

As shown, data dithering with unilateral diffusion is described using the first row sub-pixel repeating unit 501 as an example. From the first row of subpixel repeating unit 501, select red subpixel R11 and green subpixel G11 adjacent to each other, the pixel size of red subpixel R11 being larger than the pixel size of green subpixel G11. On the other side of green sub-pixel G11 is blue sub-pixel B11, the pixel size of red sub-pixel R11 being equal to the pixel size of blue sub-pixel B11. In two consecutive frame periods, frame 0 and frame 1, the red sub-pixel R11 is illuminated for one frame period, frame 0, and the green sub-pixel G11 is illuminated for a total of two frame periods, frame 0 and frame 1. , and the blue sub-pixel B11 illuminates for one frame period, frame 1 . Thus, two subpixels and one adjacent subpixel of the subpixel repeating unit 501, for a total of three subpixels, have an equivalent grayscale of 1/2 of the maximum grayscale in two consecutive frame periods; A medium gray scale was achieved.

FIG. 18 shows a schematic diagram of the second sub-pixel repeating unit of the sub-pixel driving method according to the fifth embodiment of the present invention. The sub-pixel driving method is used, for example, in a fourth type of display screen shown in FIGS. 16a-16c, where the sub-pixel repeating unit 502 is unilaterally diffuse.

As shown, data dithering with one-sided spreading is illustrated using the first row sub-pixel repeating unit 502 as an example. From the subpixel repeating unit 502 of the first row , select the blue subpixel B11 and the green subpixel G11 adjacent to each other, the pixel size of the blue subpixel B11 being larger than the pixel size of the green subpixel G11. big. On the other side of green sub-pixel G11 is red sub-pixel R11, where the pixel size of blue sub-pixel B11 is equal to the pixel size of red sub-pixel R11. In two consecutive frame periods, frame 0 and frame 1, the blue sub-pixel B11 is illuminated for one frame period, frame 0, and the green sub-pixel G11 is illuminated for a total of two frame periods, frame 0 and frame 1. and the red sub-pixel R11 illuminates for one frame period, frame one. Thus, the two subpixels and one adjacent subpixel of the subpixel repeating unit 502, for a total of three subpixels, have an equivalent grayscale of 1/2 of the maximum grayscale in two consecutive frame periods; A medium gray scale was achieved.

Figures 19a-19c show schematic diagrams of the pixel structure and pixel diffusion types of a fifth type display screen.

As shown in FIG. 19a, the width W of subpixel repeating units 601 and 602 is each 1.5 subpixels wide. In each row, two subpixel repeating units adjacent to each other include one red subpixel, one blue subpixel and one green subpixel.

As shown in FIGS. 19b and 19c, the first and second rows of subpixel repeating units 601 are unilaterally diffused, i.e., the subpixel repeating units are dithered with adjacent subpixel units on one side of the first and second rows of subpixel repeating units. The row and second row subpixel repeating units 602 are unilaterally diffused, ie, the subpixel repeating unit is dithered with the adjacent subpixel units on either side of it, and so on.

In the example, the quantity ratio of the subpixel repeating unit 601 is S=1/2, the number of frames in the dithering period Td is N=4, and the product of the quantity ratio S and the number of frames N is an integer 2. be.

FIG. 20 shows a schematic diagram of the first sub-pixel repeating unit of the sub-pixel driving method according to the sixth embodiment of the present invention. The sub-pixel driving method is used, for example, in a fifth type of display screen shown in FIGS. 19a-19c, where the sub-pixel repeating unit 601 is unilaterally diffused.

As shown, data dithering with unilateral diffusion is illustrated using the first row subpixel repeating unit 601 as an example. From the subpixel repeating unit 601 of the first row , select red subpixel R11 and green subpixel G11 adjacent to each other. On the other side of green subpixel G11 is blue subpixel B11. In frame 0 to frame 3 of four consecutive frame periods, the red sub-pixel R11 is illuminated for a total of two frame periods of frame 0 and frame 2, and the green sub-pixel G11 is illuminated for a total of two frame periods of frame 1 and frame 3. The blue sub-pixel B11 is illuminated during a frame period, and the blue sub-pixel B11 is illuminated during a total of two frame periods, frame 0 and frame 2. FIG. Thus, two subpixels and one adjacent subpixel of the subpixel repeating unit 601, for a total of three subpixels, have an equivalent grayscale of 1/2 of the maximum grayscale in four consecutive frame periods; A medium gray scale was achieved.

FIG. 21 shows a schematic diagram of the second sub-pixel repeating unit of the sub-pixel driving method according to the sixth embodiment of the present invention. The sub-pixel driving method is used, for example, in a fifth type of display screen shown in FIGS. 19a-19c, in which the sub-pixel repeating unit 602 is double-sided.

As shown, double-sided data dithering is illustrated using the first row sub-pixel repeating unit 602 as an example. From the first row of subpixel repeating unit 602, select adjacent blue subpixel B11 and red subpixel R11. On the other side of the blue sub-pixel B11 is the green sub-pixel G11 and on the other side of the red sub-pixel R11 is the green sub-pixel G12. In four consecutive frame periods, frames 0 to 3, the blue sub-pixel B11 and the red sub-pixel R11 are illuminated for a total of two frame periods, frames 0 and 2, and the green sub-pixel G11 is illuminated for frame 1. Green sub-pixel G 12 illuminates for one frame period, frame 3 . Thus, two subpixels and one adjacent subpixel of the subpixel repeating unit 602, a total of four subpixels, have an equivalent grayscale of 1/2 of the maximum grayscale in four consecutive frame periods; A medium gray scale was achieved.

According to embodiments of the present invention, e.g., as noted above, these embodiments are not intended to detail every detail and are intended to limit the invention to only the specific embodiments. do not have. Obviously, many modifications and variations are possible in light of the above description. This specification selects and illustrates these embodiments in order to better explain the principles and practical uses of the present invention, thereby enabling those skilled in the art to better utilize the present invention. , and modified in accordance with the present invention. The protection scope of the present invention should be determined by the scope defined by the claims of the present invention.

Claims (5)

A method of driving sub-pixels of a display screen, comprising:
The display screen includes a plurality of pixel units, each of the plurality of pixel units includes a plurality of sub-pixels arranged in a pixel structure for displaying different colors, the method comprising:
converting the color image signal to a grayscale image signal represented by a minimum grayscale and a maximum grayscale;
selecting a subpixel repeating unit including a plurality of subpixels arranged in a row direction based on the pixel structure;
performing data dithering using interior sub-pixels and adjacent exterior sub-pixels of the sub-pixel repeat unit in a plurality of consecutive frame periods, wherein the data dithering converts the grayscale image signal into into a rendered image signal, thereby reducing brightness and power consumption by converting the sub-pixel repeat unit drive operation into the pixel-by-pixel drive operation. performing data dithering , wherein repeating units are illuminated based on intermediate grayscales smaller than the maximum grayscale ;
utilizing the rendered image signal to drive the plurality of sub-pixels;
the pixel structure is an array structure including a row direction and a column direction;
The step of selecting a subpixel repeating unit includes:
determining the subpixel repeating unit along a row direction;
obtaining a numerical ratio S of the number of the pixel units to the number of the subpixel repeating units, wherein each of the pixel units includes the subpixel repeating unit and an adjacent outer subpixel. and
including
the pixel unit includes a set of sub-pixels for displaying three colors of red, green and blue;
The dithering period of the data dithering includes a plurality of consecutive frame periods, further comprising obtaining the dithering period between the step of obtaining the numerical ratio S and the step of data dithering, wherein the plurality of The product of the number of frames N in the frame period and the numerical ratio S is an integer of 1 or more,
Under the low power consumption mode, in each frame period of the dithering period, the sub-pixels driven to be illuminated based on the data dithering correspond to the maximum grayscale and are illuminated. The method , wherein the sub-pixels that are not driven correspond to the minimum grayscale . the numerical ratio S of the sub-pixel repeating units is one of 1/2, 1/3, and 2/3; the number of frames N of the dithering period is a corresponding one of 2, 6, and 6; 2. The method of claim 1, wherein the intermediate grayscales are corresponding ones of 1/2, 1/3 and 2/3 of the maximum grayscale. 2. The method of claim 1, wherein the exterior subpixels are subpixels adjacent to one or both sides of the subpixel repeating unit, and wherein the exterior subpixels are subpixels of colors not included in the subpixel repeating unit. 2. The method of claim 1, wherein the data dithering reduces display screen power consumption and suppresses color artifacts. A display driving apparatus for driving a display in which a display screen includes a plurality of pixel units, each of the plurality of pixel units arranged in a pixel structure and including a plurality of sub-pixels for displaying different colors,
a first drive channel for processing received color image signals into first drive signals;
a second drive channel for processing received color image signals into second drive signals;
A selection unit for selecting one of the first driving channel and the second driving channel according to the first mode and second mode selection signals of the display screen, wherein the power consumption of the second mode of the display screen is a selection unit that is less than the power consumption of the first mode;
The second drive channel is
a data conversion module for converting the color image signal into a grayscale image signal represented by a minimum grayscale and a maximum grayscale;
a data dithering module for dithering the grayscale image signal to produce a rendered image signal in successive frame periods;
a voltage selection module for selecting one of a minimum grayscale and a maximum grayscale based on the binary value of the rendered image signal;
The data dithering module converts the grayscale image signal into the rendered image signal , thereby converting the sub-pixel repeat-wise drive operation into the pixel-by-pixel drive operation, thereby reducing luminance and wherein the subpixel repeating units are illuminated based on intermediate grayscales smaller than the maximum grayscale to reduce power consumption;
the pixel structure is an array structure including a row direction and a column direction;
When selecting the subpixel repeating unit, determining the subpixel repeating unit along the row direction, a numerical ratio S of the number of the pixel units to the number of the subpixel repeating units , wherein the pixel unit is obtaining a numerical ratio S, each comprising said subpixel repeating unit and an adjacent outer subpixel ;
the pixel unit includes a set of sub-pixels for displaying three colors of red, green and blue;
The dithering period of the data dithering includes a plurality of consecutive frame periods, and between the acquisition of the numerical ratio S and the dithering process, the dithering period is acquired, and the frame number N of the plurality of frame periods is obtained. The product with the numerical ratio S is an integer of 1 or more,
Under the second mode, in each frame period of the dithering period, the sub-pixels driven to be illuminated based on the data dithering correspond to the maximum grayscale and are illuminated. A display driver, wherein the sub-pixels that are not driven correspond to the minimum grayscale .

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