CN106033659B

CN106033659B - Display driver and display device

Info

Publication number: CN106033659B
Application number: CN201510121506.2A
Authority: CN
Inventors: 杨学炎; 杨凯闵; 涂清源; 白凤霆
Original assignee: Novatek Microelectronics Corp
Current assignee: Novatek Microelectronics Corp
Priority date: 2014-12-05
Filing date: 2015-03-19
Publication date: 2020-04-28
Anticipated expiration: 2035-03-19
Also published as: CN106033659A; TWI557720B; TW201621877A

Abstract

The invention provides a display driver and a display device, wherein the display driver is used for driving a display panel. The display panel is used for displaying an image frame in a first display mode or a second display mode. The display driver comprises a first display driving channel and a second display driving channel, and is used for driving the display panel to display an image picture by using a sub-pixel imaging method in a first display mode and a second display mode. In the second display mode, the second display driving channel drives the sub-pixels on the display panel to display corresponding gray-scale values by using a plurality of gamma voltages. The voltage value of at least one gamma voltage in the gamma voltages is determined according to the arrangement mode of the sub-pixels on the display panel. In addition, the display driver and the display device provided by the invention can give consideration to both display quality and energy and power saving.

Description

Display driver and display device

Technical Field

The present invention relates to an electronic device and a driver of the electronic device, and more particularly, to a display driver and a display device.

Background

With the vigorous development of display technology, the performance requirements of the display panel in the market are moving toward high resolution, high brightness and low power consumption. However, as the resolution of the display panel increases, the number of sub-pixels on the display panel increases to achieve high resolution, thereby increasing the manufacturing cost of the display panel. In order to reduce the manufacturing cost of the display panel, a sub-pixel rendering method (SPR method) is developed. The display device uses different sub-pixel arrangements and designs to make a proper algorithm, so that the resolution of the displayed image can be improved to the sub-pixel resolution. Since the size of the sub-pixels is smaller than that of the pixels, the resolution (i.e., visual resolution) at which the human eye can see the image can be improved. In addition, from the viewpoint of low power consumption, the display device can also operate in a low power operation mode according to the requirements of practical applications. In the low power operation mode, the display device can provide better user experience if it can continuously provide good display quality.

Disclosure of Invention

The invention provides a display driver and a display device, which can give consideration to both display quality and energy and power saving.

The invention provides a display driver for driving a display panel. The display panel is used for displaying an image frame in a first display mode or a second display mode. The display driver includes a first display driving channel and a second display driving channel. The first display driving channel drives the display panel to display an image picture by utilizing a sub-pixel imaging method in a first display mode. The second display driving channel drives the display panel to display an image picture by using a sub-pixel imaging method in a second display mode. The display panel includes a subpixel repeating unit. The subpixel repeating unit is repeatedly arranged to form a display panel. The sub-pixel repeating unit includes a plurality of pixel units. Each pixel unit comprises one to two sub-pixels. In the second display mode, the second display driving channel drives the sub-pixels on the display panel to display corresponding gray-scale values by using a plurality of gamma voltages (gamma voltages). The voltage value of at least one gamma voltage in the gamma voltages is determined according to the arrangement mode of the sub-pixels on the display panel.

A display device of the present invention includes a display panel and a display driver. The display panel includes a subpixel repeating unit. The subpixel repeating unit is repeatedly arranged to form a display panel. The sub-pixel repeating unit includes a plurality of pixel units. Each pixel unit comprises one to two sub-pixels. The display panel is used for displaying an image frame in a first display mode or a second display mode. The display driver is coupled to the display panel. The display driver comprises a first display driving channel and a second display driving channel, and is used for driving the display panel to display an image picture by utilizing a sub-pixel imaging method. In the second display mode, the second display driving channel drives the sub-pixels on the display panel to display corresponding gray-scale values by using a plurality of gamma voltages. The voltage value of at least one gamma voltage in the gamma voltages is determined according to the arrangement mode of the sub-pixels on the display panel.

In an embodiment of the invention, in the display panel, each pixel unit includes at least one of a first color sub-pixel, a second color sub-pixel and a third color sub-pixel. The voltage value of at least one gamma voltage in the gamma voltages is determined according to at least one proportional relationship. At least one proportional relationship is determined according to a first quantity proportion occupied by at least one of the first color sub-pixel, the second color sub-pixel and the third color sub-pixel in the sub-pixel repeating unit in the first direction and a second quantity proportion occupied by the at least one of the first color sub-pixel, the second color sub-pixel and the third color sub-pixel in the second direction on the basis of the pixel unit.

In an embodiment of the invention, in the display panel, the pixel unit includes a first pixel unit and a second pixel unit. The first color sub-pixel and the second color sub-pixel are adjacently arranged to form a first pixel unit. The third color sub-pixels and the second color sub-pixels are adjacently arranged to form a second pixel unit.

In an embodiment of the invention, in the display panel, the pixel unit includes a first pixel unit, a second pixel unit and a third pixel unit. The first color sub-pixel and the second color sub-pixel are adjacently arranged to form a first pixel unit. The third color sub-pixels and the second color sub-pixels are adjacently arranged to form a second pixel unit. The first color sub-pixel and the third color sub-pixel are adjacently arranged to form a third pixel unit.

In an embodiment of the invention, in the display panel, the first color sub-pixel, the second color sub-pixel and the third color sub-pixel are adjacently arranged to form two pixel units among the pixel units.

In an embodiment of the invention, in the display panel, each pixel unit includes a single sub-pixel. The single sub-pixel comprises a first color sub-pixel, a second color sub-pixel or a third color sub-pixel.

In an embodiment of the invention, in the display panel, the first color sub-pixel, the second color sub-pixel and the third color sub-pixel are a red sub-pixel, a green sub-pixel and a blue sub-pixel, respectively.

In an embodiment of the invention, the sub-pixel includes a target driving sub-pixel. In the second display mode, the second display driving channel determines whether to drive the target driving sub-pixel by using the determined at least one gamma voltage according to the boundary relationship between the target driving sub-pixel and the plurality of sub-pixels adjacent to the target driving sub-pixel.

In an embodiment of the invention, the second display driving channel determines the boundary relationship according to the most significant bits of the sub-pixel data of the write-target driving sub-pixel and the sub-pixels adjacent to the write-target driving sub-pixel.

In an embodiment of the invention, the second display driving channel includes a data processing unit and a voltage output unit. The data processing unit is used for determining the boundary relation according to the most significant bit of the sub-pixel data of the writing target driving sub-pixel and the sub-pixel adjacent to the writing target driving sub-pixel. The voltage output unit is coupled to the data processing unit. The voltage output unit is used for judging whether the target driving sub-pixel is driven by the determined at least one gamma voltage according to the boundary relation between the target driving sub-pixel and a plurality of sub-pixels adjacent to the target driving sub-pixel.

In an embodiment of the invention, the gamma voltages include a first gamma voltage, a second gamma voltage and a third gamma voltage. The voltage value of the third gamma voltage is determined according to the arrangement mode of the sub-pixels on the display panel. The voltage value of the first gamma voltage is smaller than that of the second gamma voltage. The voltage value of the third gamma voltage is between the voltage values of the first gamma voltage and the second gamma voltage.

In an embodiment of the invention, the gamma voltages further include a fourth gamma voltage. The voltage value of the fourth gamma voltage is also determined according to the arrangement mode of the sub-pixels on the display panel. The voltage value of the fourth gamma voltage is between the voltage values of the first gamma voltage and the third gamma voltage.

In an embodiment of the invention, in the first display mode, the first display driving channel drives the display panel by using the first gamma voltage and the second gamma voltage.

In an embodiment of the invention, the display driver further includes a selection unit. The selection unit selects and utilizes the first display driving channel or the second display driving channel to drive the display panel to display the image frame in the first display mode or the second display mode according to the selection signal.

In view of the above, in the exemplary embodiment of the invention, the display driver drives the sub-pixels to display the corresponding gray-scale values by using the gamma voltages determined according to the arrangement of the sub-pixels on the display panel in the second display mode, which can achieve both the display quality and the power saving.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the internal circuit blocks of the display driver of the embodiment of FIG. 1;

FIG. 3 is a schematic diagram of a portion of pixel data according to an embodiment of the invention;

FIG. 4 is a schematic diagram of a partial sub-pixel on a display panel according to an embodiment of the invention;

FIG. 5 is a schematic diagram of a sub-pixel repeat unit according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a sub-pixel combination for displaying a white color point according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a portion of pixel data according to another embodiment of the present invention;

FIG. 8 is a schematic diagram of a partial sub-pixel on a display panel according to another embodiment of the present invention;

FIG. 9 is a schematic diagram of a sub-pixel repeat unit according to another embodiment of the present invention;

FIG. 10 is a schematic diagram of a sub-pixel combination for displaying a white point according to another embodiment of the present invention;

FIG. 11 is a schematic diagram of a portion of pixel data according to yet another embodiment of the present invention;

FIG. 12 is a schematic diagram of a partial sub-pixel on a display panel according to yet another embodiment of the present invention;

FIG. 13 is a schematic diagram of a subpixel repeating unit according to yet another embodiment of the present invention;

FIG. 14 is a schematic diagram of a sub-pixel combination for displaying a white point according to another embodiment of the present invention;

FIG. 15 is a schematic diagram of a portion of pixel data according to yet another embodiment of the present invention;

FIG. 16 is a schematic diagram of a partial sub-pixel on a display panel according to yet another embodiment of the invention;

FIG. 17 is a schematic diagram of a sub-pixel repeat unit according to yet another embodiment of the present invention;

FIG. 18 is a schematic diagram of a sub-pixel combination for displaying a white point according to still another embodiment of the present invention;

fig. 19 is a flowchart illustrating steps of a display driving method according to an embodiment of the invention.

Description of reference numerals:

100: a display device;

110: a display driver;

112: a first display drive channel;

114: a second display drive channel;

116: a selection unit;

120. 420, 520, 620, 720: a display panel;

210: a first voltage converter;

220: a boundary detection circuit;

230: a pixel filter circuit;

240: a second voltage converter;

310: a data processing unit;

320: a voltage output unit;

422R, 422B, 522R, 522B, 522G, 622R, 622B, 722R, 722B, 722G: a pixel unit;

430. 530, 630, 730: a subpixel repeating unit;

622: a sub-pixel combination;

p11, P12, P13, P14, P44: pixel data;

s1: displaying the data;

s2, S3: a drive signal;

SEL: a selection signal;

SP _ G: a green sub-pixel;

SP _ R: a red sub-pixel;

SP _ B: a blue sub-pixel;

WP: a pixel width;

2 WP: twice the pixel width;

x, Y: a coordinate direction;

s900, S910, S920, S930, S940, S950, S960, S970: and displaying the driving method.

Detailed Description

Fig. 1 is a schematic diagram of a display device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of the internal circuit blocks of the display driver of the embodiment shown in FIG. 1. Referring to fig. 1 and fig. 2, the display device 100 of the present embodiment includes a display driver 110 and a display panel 120. The display driver 110 is coupled to the display panel 120. The display driver 110 is configured to receive the display data S1 and output a driving signal S2 or S3 to the display panel 120 after performing data processing on the display data S1 to drive the display panel 120 to display an image in the first display mode or the second display mode by using a sub-pixel imaging method. In the present embodiment, the second display mode is, for example, a low-power mode (low-power mode) in the application of energy saving and power saving. In contrast, the first display mode is, for example, a normal mode (normal mode) which is a non-low power operation mode.

Specifically, in the present embodiment, the display driver 110 includes a first display driving channel 112, a second display driving channel 114 and a selection unit 116. The selection unit 116 is used for selecting the first display driving channel 112 or the second display driving channel 114 according to the selection signal SEL to perform data processing on the display data S1. The first display driving channel 112 and the second display driving channel 114 output driving signals S2 and S3 respectively, so that the display driver 110 drives the display panel 120 to display an image in the first display mode or the second display mode.

In this embodiment, for example, when the display device 100 needs to enter the low power operation mode, the selection signal SEL selects to turn on the signal transmission path connected to the second display driving path 114, so that the display driver 110 drives the display panel 120 by using the second display driving path 114. In the present embodiment, the possible situations that the display apparatus 100 enters the low power operation mode include, but are not limited to, a standby state of the display apparatus 100 due to a long time period without displaying a complete image, or a situation that a user sets the display apparatus 100 to enter the low power operation mode according to actual operation requirements, or a situation that power of a power device for supplying the display apparatus 100 is exhausted, or another situation that the power device may need to enter the low power operation mode. In at least three cases, the display device 100 may enter a low power operation mode, in which the display driver 110 drives the display panel 120 by using the second display driving channel 114.

In the present embodiment, the first display driving channel 112 drives the display panel 120 to display an image frame by using a sub-pixel imaging method in the first display mode. Specifically, the first display driving channel 112 of the present embodiment includes a first voltage converter 210, an edge detection (edge detection) circuit 220, a pixel filtering (pixel filtering) circuit 230, and a second voltage converter 240. In the first display mode, the first voltage converter 210, for example, performs a linear conversion (gamma-to-linear conversion) on the image signal of the non-linear gamma of the display data S1 to convert the non-linear gamma image signal into a linear signal. Next, the boundary detection circuit 220 performs boundary detection on the image screen information included in the linear signal. Then, the pixel filter circuit 230 performs a filtering operation on the boundary information of the image frame to improve the quality of the image frame to be displayed. Then, the second voltage converter 240 performs a non-linear conversion (linear-to-gamma conversion) on the linear signal after the filtering operation to convert the linear signal into a non-linear gamma voltage, so as to output the driving signal S2 to drive the display panel 120 in the first display mode.

Therefore, in the first display mode, the first display driving channel 112 drives the display panel 120 with a plurality of predetermined gamma voltages, for example. For example, in one embodiment, the first display driving channel 112 drives the plurality of sub-pixels on the display panel 120 to display the corresponding gray-scale values in the first display mode by using, for example, the gamma voltages V0 and V255 and other predetermined gamma voltages.

In the present embodiment, the second display driving channel 114 drives the display panel 120 to display the image frame by using the sub-pixel imaging method in the second display mode. Specifically, the second display driving channel 114 of the present embodiment includes a data processing unit 310 and a voltage output unit 320. The voltage output unit 320 is coupled to the data processing unit 310. In the second display mode, the voltage output unit 320 drives the display panel 120 with a plurality of gamma voltages. In the present embodiment, the voltage value of at least one of the gamma voltages for driving the display panel 120 is determined according to the arrangement of the sub-pixels on the display panel 120. For example, in the present embodiment, the arrangement of the sub-pixels can be evaluated by at least a proportional relationship related to the arrangement of the sub-pixels. The proportional relationship is determined according to the arrangement of the sub-pixels with different colors in different directions on the display panel 120, for example. Therefore, in the present embodiment, the voltage value of at least one gamma voltage among the gamma voltages for driving the display panel 120 can be determined according to the proportional relationship, for example.

For example, in one embodiment, the voltage output unit 320 drives the plurality of sub-pixels on the display panel 120 to display the corresponding gray-scale values in the second display mode by using the gamma voltages V0, V186, and V255, for example. In this example, the gamma voltage V186 is determined according to the arrangement of the sub-pixels on the display panel 120, and the determined gamma voltage V186 is between the gamma voltages V0 and V255. That is, the gamma voltage V186 is determined as an intermediate voltage between the two voltages in the panel sub-pixel ratio for providing the complementary color requirement of the sub-pixel arrangement on the edge. In another embodiment, the voltage output unit 320 drives the plurality of sub-pixels on the display panel 120 to display the corresponding gray-scale values in the second display mode by using the gamma voltages V0, V155, V212, and V255, for example. In this example, the gamma voltages V155 and V212 are determined according to the arrangement of the sub-pixels on the display panel 120, and the determined gamma voltages V155 and V212 are between the gamma voltages V0 and V255. In the present embodiment, compared to the second display mode, in the first display mode, the gamma voltages V0, V255 for driving the display panel 120 and other predetermined gamma voltages are predetermined and are not adjusted according to the proportional relationship on the display panel 120 related to the arrangement of the sub-pixels. That is, the gamma voltages V0 and V255 determine the minimum gray-scale value and the maximum gray-scale value of the display panel 120.

It should be noted that although the present embodiment is illustrated with the display driver 110 including two display driving channels, the invention is not limited thereto. In one embodiment, the driving function of the second display driving channel 114 can also be integrated into any circuit block of the first display driving channel 112. Alternatively, in one embodiment, the driving function of the second display driving channel 114 can be realized by adding circuit blocks in the first display driving channel 112.

Several embodiments are presented below to illustrate the manner in which the gamma voltages are determined by the second display driving channel 114, but the present invention is not limited to the illustrated embodiments. Suitable combinations between the embodiments are also allowed.

Fig. 3 is a schematic diagram illustrating a part of pixel data according to an embodiment of the invention. Fig. 4 is a schematic diagram illustrating a partial sub-pixel on a display panel according to an embodiment of the invention. Fig. 5 is a schematic diagram of a sub-pixel repeating unit according to an embodiment of the invention.

Referring to fig. 1 to 5, in the present embodiment, the display data S1 input to the display driver 110 in fig. 1, for example, shown in fig. 3 includes a plurality of pixel data P11 to P44 respectively written to a plurality of

pixel units

422R and 422B on the display panel 420. In the present embodiment, the pixel data P11-P44 respectively include first color sub-pixel data, second color sub-pixel data and third color sub-pixel data. In addition, although fig. 3 illustrates only 16 pixel data P11-P44 in the embodiment, the number of the pixel data is not limited to the invention. In the present embodiment, the display panel 420 includes a plurality of

pixel units

422R and 422B, and each of the

pixel units

422R and 422B includes two sub-pixels. The two sub-pixels are, for example, sub-pixels of two colors selected from the first color sub-pixel, the second color sub-pixel and the third color sub-pixel. For example, in the present embodiment, the first color sub-pixel, the second color sub-pixel and the third color sub-pixel are, for example, a red sub-pixel, a green sub-pixel and a blue sub-pixel, respectively, but the invention is not limited thereto. In one embodiment, the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel may be a combination of a white sub-pixel and other different color sub-pixels. In the present embodiment, the pixel unit 422R includes, for example, a red sub-pixel and a green sub-pixel, and the pixel unit 422B includes, for example, a blue sub-pixel and a green sub-pixel. Two kinds of

pixel units

422R, 422B including different color sub-pixels are arranged alternately in different directions of the display panel 420 to form a sub-pixel array. In the present embodiment, the

pixel units

422R and 422B respectively include two sub-pixels.

In the present embodiment, the display driver 110 writes, for example, pixel data P11 into the pixel unit 422R, both of which have a pixel width WP in the X direction and the Y direction. In the present embodiment, since the pixel unit 422R only includes the red sub-pixel and the green sub-pixel, the display driver 110 drives the display panel 420 to display an image picture by using the sub-pixel imaging method. In the sub-pixel imaging method, in order to display the pixel data P11 with red, blue and green colors, the pixel unit 422R including only the red sub-pixel and the green sub-pixel cooperates with the adjacent pixel unit 422B to display the pixel data P11 to compensate the missing blue sub-pixel. Similarly, in the sub-pixel imaging method, in order to display the pixel data P12 having red, blue and green colors, the pixel unit 422B including only the blue sub-pixel and the green sub-pixel cooperates with at least the left and right adjacent pixel units 422R to display the pixel data P12 to compensate the red sub-pixel lacking in itself. This method of displaying the same pixel data by using the cooperation of adjacent pixel units may be referred to as a sub-pixel imaging method, but the invention is not limited thereto. In other embodiments, there are other possible variations of the driving method for the display driver 110 to drive the display panel 420 to display the image frame by using the sub-pixel imaging method.

Referring to fig. 5, in the present embodiment, a portion of the sub-pixels of the display panel 420 are arranged in an array to form the sub-pixel repeating unit 430 of fig. 5. The subpixel repeating unit 430 is repeatedly arranged to form a subpixel array of the display panel 420. In the present embodiment, the sub-pixel repeating unit 430 is, for example, a 4 × 4 pixel array formed by arranging a plurality of

pixel units

422R and 422B. In the present embodiment, the voltage output unit 320 drives the sub-pixels on the display panel 420 with, for example, the gamma voltage V186 in the second display mode in addition to the gamma voltages V0, V255. In the present embodiment, the gamma voltage V186 is determined according to at least one proportional relationship, for example. The proportional relationship is determined according to a first quantity ratio (horizontal sub-pixel ratio) occupied by the

pixel units

422R and 422B in the sub-pixel repeating unit 430 in the X direction on a pixel unit basis in the first pixel row of the sub-pixel repeating unit 430 and a second quantity ratio (vertical sub-pixel ratio) occupied by the

pixel units

422R and 422B in the Y direction on a pixel unit basis in the second pixel row of the sub-pixel repeating unit 430. For example, taking a red subpixel as an example, in the first row of the subpixel repeating unit 430, the pixel unit 422R occupies 1/2 in the same row (row) in the X direction in terms of the ratio of the number. That is, among the four

pixel units

422R, 422B of the first column, the pixel unit 422R having the red sub-pixel occupies two in number on a pixel unit basis, and thus the first number ratio is 1/2. Each pixel column includes the pixel unit 422R in the Y direction, and therefore, the pixel unit 422R occupies a second number proportion 1/1 in the Y direction in terms of the number proportion. That is, in the subpixel repeating unit 430, each column includes the pixel unit 422R having the red subpixel on a pixel unit basis, and thus the second number ratio is 1/1. Therefore, the ratio relationship determined according to the red sub-pixel is (1/2)/(1/1) 1/2. Similarly, taking the blue sub-pixel as an example, in the sub-pixel repeating unit 430, the pixel unit 422B occupies the first number proportion 1/2 in the same column in the X direction. Each pixel column includes the pixel unit 422B in the Y direction, and therefore, the pixel unit 422B occupies the second number proportion 1/1 in the Y direction. Therefore, the ratio determined according to the blue sub-pixel is (1/2)/(1/1) 1/2. Further, taking a green sub-pixel as an example, in the sub-pixel repeating unit 430, since the

pixel units

422B and 422R both include a green sub-pixel, the first number ratio of the

pixel units

422B and 422R occupied in the first pixel column of the sub-pixel repeating unit 430 in the X direction is 1/1, and the second number ratio of the

pixel units

422B and 422R occupied in the column of the sub-pixel repeating unit 430 in the Y direction is 1/1. Therefore, the ratio determined according to the green sub-pixel is (1/1)/(1/1) to 1/1. In the present embodiment, the gamma voltage V186 is determined by matching a predetermined gamma voltage curve according to the proportional relationship 1/2, and is used for driving the red and blue sub-pixels on the display panel 420.

After the voltage value of the gamma voltage V186 is determined according to the arrangement of the sub-pixels on the display panel 420, the voltage output unit 320 determines whether to drive the target driving sub-pixel by the determined gamma voltage V186 according to the boundary relationship between the target driving sub-pixel and the adjacent sub-pixels. For example, in the present embodiment, assuming that the target driving sub-pixel is the blue sub-pixel of the pixel unit 422B in fig. 4, the data processing unit 310 determines the boundary relationship between the sub-pixels according to the most significant bits of the sub-pixel data written into the target driving sub-pixel and the sub-pixels adjacent to the target driving sub-pixel. Taking the blue sub-pixel data of the pixel data P11, P12, and P13 as an example, the data processing unit 310 retrieves (fetch) the most significant bit of the blue sub-pixel data to determine the boundary relationship between the blue sub-pixels. Assuming that the sequence of the most significant bits of the blue sub-pixel data retrieved by the data processing unit 310 is 010 in order, in this case, the voltage output unit 320 determines to drive the blue sub-pixel of the pixel unit 422B by the gamma voltage V186. In addition, in the embodiment, assuming that the sequence of the most significant bits of the blue sub-pixel data retrieved by the data processing unit 310 is 011, 100 or 101, the voltage output unit 320 also determines to drive the blue sub-pixel of the pixel unit 422B by the gamma voltage V186. In the present embodiment, if the sequence of the most significant bits of the blue sub-pixel data is 000, 001, 110 or 111, the voltage output unit 320 drives the blue sub-pixel of the pixel unit 422B with, for example, a gamma voltage V0 or V255. Similarly, in the present embodiment, if the target driving sub-pixel is the red sub-pixel of the pixel unit 422R, whether the voltage output unit 320 is driven by the gamma voltage V186 can also be determined by the above-mentioned determining method, which is not described herein again. In addition, in the present embodiment, the green sub-pixel is driven by, for example, a gamma voltage V0 or V255.

Therefore, in the present embodiment, the voltage output unit 320 may have a truth table (look-up table) built therein, wherein the sequence of the most significant bits and the corresponding relationship of the gamma voltages are listed. The voltage output unit 320 can determine which gamma voltage needs to be output to drive the sub-pixels under which boundary relationship according to the truth table.

FIG. 6 is a schematic diagram of a combination of sub-pixels displaying a white color point according to an embodiment of the invention. In the present embodiment, the display panel 420 displays a white color point by using a sub-pixel combination including a red sub-pixel SP _ R, a green sub-pixel SP _ G, and a blue sub-pixel SP _ B. In fig. 6, the red sub-pixel SP _ R is denoted by R186, which indicates that the red sub-pixel SP _ R is driven by the gamma voltage V186 and displays red. The green sub-pixel SP _ G is denoted by G255, and represents that the green sub-pixel SP _ G is driven by the gamma voltage V255 and displays green. The blue sub-pixel SP _ B is labeled B186, which means that the blue sub-pixel SP _ B is driven by the gamma voltage V186 and displays blue. The red, green and blue sub-pixels SP _ R, SP _ G and SP _ B cooperate to display a white color point in the second display mode.

Fig. 7 is a schematic diagram illustrating a part of pixel data according to another embodiment of the present invention. Fig. 8 is a schematic diagram illustrating a partial sub-pixel on a display panel according to another embodiment of the invention. Fig. 9 is a schematic diagram of a sub-pixel repeating unit according to another embodiment of the present invention. Referring to fig. 7 to 9, the display panel 520 of the present embodiment is similar to the display panel 420 of the embodiment of fig. 4, but the main differences between the two embodiments are, for example, the arrangement of the sub-pixels on the display panel 520 and the constituent elements of the sub-pixel repeating unit 530.

Specifically, in the present embodiment, the display panel 520 includes a plurality of

pixel units

522R, 522G, and 522B, and each of the

pixel units

522R, 522G, and 522B includes two sub-pixels. For example, in the present embodiment, the pixel unit 522R includes, for example, a red sub-pixel and a green sub-pixel, the pixel unit 522B includes, for example, a blue sub-pixel and a red sub-pixel, and the pixel unit 522G includes, for example, a green sub-pixel and a blue sub-pixel. The three

pixel units

522R, 522G, 522B including different color sub-pixels are arranged in a staggered manner in different directions of the display panel 520 to form a sub-pixel array. In the present embodiment, the

pixel units

522R, 522G, and 522B respectively include two sub-pixels.

In the present embodiment, a portion of the sub-pixels of the display panel 520 are arranged in an array to form the sub-pixel repeating unit 530 of fig. 9. The subpixel repeating unit 530 is repeatedly arranged to form a subpixel array of the display panel 520. In the present embodiment, the sub-pixel repeating unit 530 is, for example, a 3 × 4 pixel array formed by arranging a plurality of

pixel units

522R, 522G, 522B. In the present embodiment, in addition to the gamma voltages V0, V255, the voltage output unit 320 drives the sub-pixels on the display panel 520 with the gamma voltage V212 in the second display mode, for example. In the present embodiment, the gamma voltage V212 is determined according to a ratio (horizontal sub-pixel ratio) of a first number occupied by the

pixel units

522R, 522G, 522B on the first pixel column of the sub-pixel repeating unit 530 in the X direction and a second number occupied by the

pixel units

522R, 522G, 522B on the column of the sub-pixel repeating unit 430 in the Y direction, for example. For example, taking a red sub-pixel as an example, in the first row of the sub-pixel repeating unit 530, the

pixel units

522R and 522B both include a red sub-pixel, and the ratio of the two numbers in the same row in the X direction is 2/3. That is, among the three

pixel units

522R, 522G, 522B of the first column, on a pixel unit basis, the

pixel units

522R, 522B having the red sub-pixel occupy two in number, and thus the first number ratio is 2/3. Each column includes the

pixel cells

522R, 522B having the red sub-pixel in the Y direction, and therefore, the proportion of the

pixel cells

522R, 522B occupied in the Y direction is 1/1 in terms of the proportion of the number. That is, on a pixel unit basis, each column in subpixel repeating unit 530 includes

pixel cells

522R, 522B having red subpixels, and thus has a ratio of 1/1. Therefore, the ratio relationship determined according to the red sub-pixel is (2/3)/(1/1) 2/3. Similarly, the ratio determined by the blue sub-pixel and the green sub-pixel is also 2/3. In the present embodiment, the gamma voltage V212 is determined by matching a predetermined gamma voltage curve according to the proportional relationship 2/3, and is used for driving the red, green and blue sub-pixels on the display panel 520.

In the present embodiment, the voltage output unit 320 drives the sub-pixels on the display panel 520 with, for example, the gamma voltage V155 in the second display mode in addition to the gamma voltages V0, V212, V255. In the present embodiment, the voltage value of the gamma voltage V155 is between the gamma voltages V0 and V212. In detail, after the gamma voltage V212 is determined according to the proportional relationship of 2/3 and a preset gamma voltage curve, the proportional relationship of 2/3 is divided by 2 to obtain the proportional relationship of 1/3. The gamma voltage V155 is determined according to the proportional relationship 1/3 and a predetermined gamma voltage curve, and is used to drive the red, green and blue sub-pixels on the display panel 520. In other words, the gamma voltage V155 is also determined according to the arrangement of the sub-pixels on the display panel 520.

After the voltage values of the gamma voltages V155 and V212 are determined according to the arrangement of the sub-pixels on the display panel 520, the voltage output unit 320 determines whether to drive the target driving sub-pixel by using the determined gamma voltage V155 or V212 according to the boundary relationship between the target driving sub-pixel and the adjacent sub-pixels. For example, in the present embodiment, assuming that the target driving sub-pixel is the blue sub-pixel of the pixel unit 522B in fig. 8, the data processing unit 310 determines the boundary relationship between the sub-pixels according to the most significant bits of the sub-pixel data written into the target driving sub-pixel and the sub-pixels adjacent to the target driving sub-pixel. Taking the blue sub-pixel data of the pixel data P11, P12, and P13 as an example, the data processing unit 310 retrieves the most significant bit of the blue sub-pixel data to determine the boundary relationship between the blue sub-pixels. Assuming that the sequence of the most significant bits of the blue sub-pixel data retrieved by the data processing unit 310 is 010, in this case, the voltage output unit 320 determines to drive the blue sub-pixel of the pixel unit 522B by the gamma voltage V212. Assuming that the sequence of the most significant bits of the blue sub-pixel data retrieved by the data processing unit 310 is 100 or 101, in this case, the voltage output unit 320 determines to drive the blue sub-pixel of the pixel unit 522B by the gamma voltage V155.

In addition, in the present embodiment, assuming that the target driving sub-pixel is the red sub-pixel of the pixel unit 522B in fig. 8, the data processing unit 310 retrieves the most significant bits of the red sub-pixel data of the pixel data P11, P12, and P13 to determine the boundary relationship between the red sub-pixels. Assuming that the sequence of the most significant bits of the red sub-pixel data retrieved by the data processing unit 310 is 010 or 110, in this case, the voltage output unit 320 determines to drive the red sub-pixel of the pixel unit 522B by the gamma voltage V212. Assuming that the sequence of the most significant bits of the red sub-pixel data retrieved by the data processing unit 310 is 001 or 101, in this case, the voltage output unit 320 determines to drive the red sub-pixel of the pixel unit 522B by the gamma voltage V155.

Similarly, in the present embodiment, if the target driving sub-pixel is the green sub-pixel of the pixel unit 522G, whether the voltage output unit 320 is driven by the gamma voltage V155 or V212 can also be determined by the above-mentioned determination method. For example, assuming that the most significant bits of the green sub-pixel data retrieved by the data processing unit 310 are sequentially 010, in this case, the voltage output unit 320 determines to drive the green sub-pixel of the pixel unit 522G by the gamma voltage V212. Assuming that the sequence of the most significant bits of the green sub-pixel data retrieved by the data processing unit 310 is 100 or 101, in this case, the voltage output unit 320 determines to drive the green sub-pixel of the pixel unit 522G by the gamma voltage V155. In addition, in the present embodiment, if the target driving sub-pixel is the blue sub-pixel of the pixel unit 522G, whether the voltage output unit 320 is driven by the gamma voltage V155 or V212 can also be determined by the above-mentioned determination method. For example, assuming that the sequence of the most significant bits of the blue sub-pixel data retrieved by the data processing unit 310 is 010 or 110, in this case, the voltage output unit 320 determines to drive the blue sub-pixel of the pixel unit 522G by the gamma voltage V212. Assuming that the sequence of the most significant bits of the blue sub-pixel data retrieved by the data processing unit 310 is 001 or 101, in this case, the voltage output unit 320 determines to drive the blue sub-pixel of the pixel unit 522G by the gamma voltage V155.

Similarly, in the present embodiment, if the target driving sub-pixel is the red sub-pixel of the pixel unit 522R, whether the voltage output unit 320 is driven by the gamma voltage V155 or V212 can also be determined by the above-mentioned determination method. For example, assuming that the most significant bits of the red sub-pixel data retrieved by the data processing unit 310 are sequentially 010, in this case, the voltage output unit 320 determines to drive the red sub-pixel of the pixel unit 522R by the gamma voltage V212. Assuming that the sequence of the most significant bits of the red sub-pixel data retrieved by the data processing unit 310 is 100 or 101, in this case, the voltage output unit 320 determines to drive the red sub-pixel of the pixel unit 522R by the gamma voltage V155. In addition, in the present embodiment, if the target driving sub-pixel is the green sub-pixel of the pixel unit 522R, whether the voltage output unit 320 is driven by the gamma voltage V155 or V212 can also be determined by the above-mentioned determination method. For example, assuming that the sequence of the most significant bits of the green sub-pixel data retrieved by the data processing unit 310 is 010 or 110, in this case, the voltage output unit 320 determines to drive the green sub-pixel of the pixel unit 522R by the gamma voltage V212. Assuming that the sequence of the most significant bits of the green sub-pixel data retrieved by the data processing unit 310 is 001 or 101, in this case, the voltage output unit 320 determines to drive the green sub-pixel of the pixel unit 522R by the gamma voltage V155.

FIG. 10 is a schematic diagram of a sub-pixel combination for displaying a white point according to another embodiment of the present invention. In the present embodiment, the display panel 520 displays a white color point by using a sub-pixel combination including a red sub-pixel SP _ R, a green sub-pixel SP _ G, and a blue sub-pixel SP _ B. In fig. 10, the red sub-pixel SP _ R is denoted by R212, which indicates that the red sub-pixel SP _ R is driven by the gamma voltage V212 and displays red. The green sub-pixel SP _ G is denoted by G212, which means that the green sub-pixel SP _ G is driven by the gamma voltage V212 and displays green. The blue sub-pixel SP _ B is labeled B212, and represents that the blue sub-pixel SP _ B is driven by the gamma voltage V212 and displays blue. The red, green and blue sub-pixels SP _ R, SP _ G and SP _ B cooperate to display a white color point in the second display mode.

Fig. 11 is a schematic diagram illustrating a part of pixel data according to still another embodiment of the present invention. Fig. 12 is a schematic diagram of a partial sub-pixel on a display panel according to yet another embodiment of the invention. Fig. 13 is a schematic diagram of a sub-pixel repeating unit according to still another embodiment of the present invention. Referring to fig. 11 to 13, the display panel 620 of the present embodiment is similar to the display panel 520 of the embodiment of fig. 8, but the main differences between the two embodiments are, for example, the arrangement of the sub-pixels on the display panel 620 and the constituent elements of the sub-pixel repeating unit 630.

Specifically, in the present embodiment, the display panel 620 includes a plurality of sub-pixel combinations 622, which are formed by adjacently arranging a first color sub-pixel, a second color sub-pixel and a third color sub-pixel. Each sub-pixel combination 622 includes two

pixel cells

622R, 622B. For example, in the present embodiment, the sub-pixel combination 622 of the red sub-pixel, the green sub-pixel and the blue sub-pixel arranged adjacently includes two

pixel units

622R and 622B on the display panel 620. The

pixel units

622R, 622B share 3 sub-pixels, and thus, each of the

pixel units

622R, 622B includes 1.5 sub-pixels, wherein the pixel unit 622R includes a complete red sub-pixel, and the pixel unit 622B includes a complete blue sub-pixel. A plurality of sub-pixel combinations 622 including three different colors are arranged in different directions of the display panel 620 to form a sub-pixel array. In the present embodiment, the pixel data P11 and P12 are written into the same sub-pixel combination 622, for example, so that the sub-pixel combination 622 has a two-pixel width 2WP in the X direction.

In the present embodiment, a portion of the subpixels of the display panel 620 are arranged in an array to form the subpixel repeating unit 630 of fig. 13. The subpixel repeating unit 630 is repeatedly arranged to form a subpixel array of the display panel 620. In the present embodiment, the sub-pixel repeating unit 630 is, for example, a 4 × 4 pixel array formed by arranging a plurality of

pixel units

622R and 622B. In the present embodiment, in addition to the gamma voltages V0, V255, the voltage output unit 320 drives the sub-pixels on the display panel 620 with, for example, the gamma voltage V186 in the second display mode. In the present embodiment, the gamma voltage V186 is determined according to, for example, a first quantity ratio (horizontal sub-pixel ratio) occupied by the

pixel units

622R and 622B in the sub-pixel repeating unit 630 on the first pixel row of the sub-pixel repeating unit 630 in the X direction and a second quantity ratio (vertical sub-pixel ratio) occupied by the pixel units 630 in the Y direction. For example, taking a red sub-pixel as an example, in the first row of the sub-pixel repeating unit 630, the first quantity ratio occupied by the pixel unit 622R in the same row in the X direction is 1/2 in terms of the quantity ratio. That is, of the four

pixel units

622R, 622B in the first column, the pixel unit 622R having the red sub-pixel occupies two in number on a pixel unit basis, and thus the first number ratio is 1/2. Each column includes pixel cells 622R in the Y direction, and therefore, the pixel cells 622R occupy a second ratio of numbers 1/1 in the Y direction in terms of the ratio of the numbers. That is, each column in the subpixel repeating unit 630 includes a pixel unit 622R having a red subpixel on a pixel unit basis, so that the second number ratio is 1/1. Therefore, the ratio relationship determined according to the red sub-pixel is (1/2)/(1/1) 1/2. Similarly, the ratio relationship determined by the blue sub-pixel and the green sub-pixel is also 1/2. In the present embodiment, the gamma voltage V186 is determined by matching a predetermined gamma voltage curve according to the proportional relationship 1/2, and is used for driving the red, green and blue sub-pixels on the display panel 620.

After the voltage value of the gamma voltage V186 is determined according to the arrangement of the sub-pixels on the display panel 620, the voltage output unit 320 determines whether to drive the target driving sub-pixel by the determined gamma voltage V186 according to the boundary relationship between the target driving sub-pixel and the adjacent sub-pixels. In the present embodiment, the data processing unit 310 determines the boundary relationship between the sub-pixels according to, for example, the most significant bits of the sub-pixel data of the write-target driving sub-pixel and the sub-pixels adjacent thereto. In the present embodiment, the method for determining the boundary relationship between the sub-pixels by the data processing unit 310 can be obtained from the description of the embodiments in fig. 1 to 10 with sufficient teaching, suggestion and implementation descriptions, and thus, the description thereof is omitted.

FIG. 14 is a schematic diagram of a sub-pixel combination for displaying a white point according to another embodiment of the present invention. In the present embodiment, the display panel 620 displays a white color point by using a sub-pixel combination including a red sub-pixel SP _ R, a green sub-pixel SP _ G, and a blue sub-pixel SP _ B. In fig. 14, the red sub-pixel SP _ R is denoted by R186, which indicates that the red sub-pixel SP _ R is driven by the gamma voltage V186 and displays red. The green sub-pixel SP _ G is labeled G186, which means that the green sub-pixel SP _ G is driven by the gamma voltage V186 and displays green. The blue sub-pixel SP _ B is labeled B186, which means that the blue sub-pixel SP _ B is driven by the gamma voltage V186 and displays blue. The red, green and blue sub-pixels SP _ R, SP _ G and SP _ B cooperate to display a white color point in the second display mode.

Fig. 15 is a schematic diagram illustrating a part of pixel data according to still another embodiment of the present invention. Fig. 16 is a schematic diagram illustrating a partial sub-pixel on a display panel according to still another embodiment of the invention. Fig. 17 is a schematic diagram of a sub-pixel repeating unit according to still another embodiment of the present invention. Referring to fig. 15 to 17, the display panel 720 of the present embodiment is similar to the display panel 520 of the embodiment of fig. 8, but the main differences between the two embodiments are, for example, the arrangement of the sub-pixels on the display panel 720 and the constituent elements of the sub-pixel repeating unit 730.

Specifically, in the present embodiment, the display panel 720 includes a plurality of

pixel units

722R, 722G, and 722B, and each of the

pixel units

722R, 722G, and 722B includes 1 sub-pixel. For example, in the present embodiment, the pixel unit 722R includes a red sub-pixel, the pixel unit 722B includes a blue sub-pixel, and the pixel unit 722G includes a green sub-pixel. The three

pixel units

722R, 722G, and 722B including different color sub-pixels are arranged in a staggered manner in different directions of the display panel 720 to form a sub-pixel array. In the present embodiment, the pixel data P11 is, for example, written in the pixel cell 722R, and therefore, both have one pixel width WP in the X direction.

In the present embodiment, a portion of the sub-pixels of the display panel 720 are arranged in an array to form the sub-pixel repeating unit 730 of fig. 17. The subpixel repeating unit 730 is repeatedly arranged to form a subpixel array of the display panel 720. In the present embodiment, the sub-pixel repeating unit 730 is, for example, a 4 × 4 pixel array formed by arranging a plurality of

pixel units

722R, 722G, and 722B. In the present embodiment, in addition to the gamma voltages V0, V255, the voltage output unit 320 drives the sub-pixels on the display panel 720 with the gamma voltage V186, for example, in the second display mode. In the present embodiment, the gamma voltage V186 is determined according to a first quantity ratio (horizontal sub-pixel ratio) occupied by the

pixel units

722R, 722G, 722B on the first pixel row of the sub-pixel repeating unit 730 in the X direction and a second quantity ratio (vertical sub-pixel ratio) occupied by the pixel units 730 in the Y direction in the sub-pixel repeating unit 730, for example. For example, taking a red subpixel as an example, in the first row of the subpixel repeating unit 730, the pixel unit 722R occupies a first ratio of the number in the same row in the X direction of 1/2 in terms of the ratio of the number. That is, among the four

pixel units

722R, 722G, 722B of the first column, the pixel unit 722R having the red sub-pixel occupies two in number on a pixel unit basis, and thus the first number ratio is 1/2. Each alternate column in the Y direction includes pixel cells 722R, and thus, the pixel cells 722R occupy a second ratio of numbers 1/2 in the Y direction, as a ratio of numbers. That is, in the sub-pixel repeating unit 730, the pixel unit 722R having the red sub-pixel is included every other column on a pixel unit basis, and thus the second number ratio is 1/2. Therefore, the ratio relationship determined according to the red sub-pixel is (1/2)/(1/2) equal to 1. Similarly, the ratio determined according to the blue sub-pixel is also 1. In addition, in the present embodiment, taking the green sub-pixel as an example, in the sub-pixel repeating unit 730, the first number ratio occupied by the pixel unit 722G in the same column in the X direction is 1/2. Each column includes the pixel cell 722G in the Y direction, and therefore, the pixel cell 722G occupies a second ratio of the number 1/1 in the Y direction. That is, each column in the subpixel repeating unit 730 includes a pixel cell 722G having a green subpixel on a pixel cell basis, so that the second quantity ratio is 1/1. Therefore, the ratio determined according to the green sub-pixel is (1/2)/(1/1) to 1/2. Therefore, in the present embodiment, the gamma voltage V186 is determined by matching the predetermined gamma voltage curve according to the proportional relationship of 1/2, and is used for driving the green sub-pixels on the display panel 720. In the present embodiment, the red and blue sub-pixels are driven by gamma voltages V0 or V255, for example.

After the voltage value of the gamma voltage V186 is determined according to the arrangement of the sub-pixels on the display panel 720, the voltage output unit 320 determines whether to drive the target driving sub-pixel by the determined gamma voltage V186 according to the boundary relationship between the target driving sub-pixel and the adjacent sub-pixels. In the present embodiment, the data processing unit 310 determines the boundary relationship between the sub-pixels according to, for example, the most significant bits of the sub-pixel data of the write-target driving sub-pixel and the sub-pixels adjacent thereto. In the present embodiment, the method for determining the boundary relationship between the sub-pixels by the data processing unit 310 can be obtained from the description of the embodiments of fig. 1 to 10 with sufficient teaching, suggestion and implementation descriptions, and thus will not be described again.

FIG. 18 is a schematic diagram of a sub-pixel combination for displaying a white point according to still another embodiment of the present invention. In the present embodiment, the display panel 820 displays a white color point by using a sub-pixel combination including a red sub-pixel SP _ R, two green sub-pixels SP _ G, and a blue sub-pixel SP _ B, for example. In fig. 18, the red sub-pixel SP _ R is denoted by R255, and the red sub-pixel SP _ R is driven by the gamma voltage V255 and displays red. The green sub-pixel SP _ G is labeled G186 to indicate that the green sub-pixel SP _ G is driven by the gamma voltage V186 and displays green. The reference B255 in the blue sub-pixel SP _ B indicates that the blue sub-pixel SP _ B is driven by the gamma voltage V255 and displays blue. In the present embodiment, one red subpixel SP _ R, two green subpixels SP _ G, and one blue subpixel SP _ B cooperate to display one white color point in the second display mode.

Fig. 19 is a flowchart illustrating steps of a display driving method according to an embodiment of the invention. The display driving method is applied to the display device 100 of fig. 1, for example. The display driving method includes the following steps. In step S900, at least one proportional relationship related to the arrangement of the sub-pixels on the display panel 120 is determined according to the arrangement of at least one of the red sub-pixels, the green sub-pixels, and the blue sub-pixels in the X direction and the Y direction of the display panel 120. Next, in step S910, the voltage value of at least one gamma voltage V186 of the plurality of gamma voltages V0, V186, and V255 is determined according to the proportional relationship determined in step S900. Then, in step S920, the display driver 110 selects to drive the display panel 120 to display the image frame by using the first display driving channel 112 or the second display driving channel 114 in the first display mode or the second display mode according to the selection signal SEL.

In step S920, if the display driver 110 selects to drive the display panel 120 to display the image frame by using the first display driving channel 112 in the first display mode according to the selection signal SEL, the display driving method executes step S930. In step S930, the first display driving channel 112 drives the display panel 120 to display an image frame by using the gamma voltages V0 and V255 and other preset gamma voltages in the first display mode.

In step S920, if the display driver 110 selects to drive the display panel 120 to display the image frame by using the second display driving channel 114 in the second display mode according to the selection signal SEL, the display driving method will execute step S940. In step S940, the second display driving channel 114 determines the boundary relationship between the target driving sub-pixel and the adjacent sub-pixels according to the most significant bits of the sub-pixel data written into the target driving sub-pixel and the adjacent sub-pixels in the second display mode. Next, in step S950, the second display driving channel 114 determines whether to drive the target driving sub-pixel by the gamma voltage V186 determined in step S910 in the second display mode according to the boundary relationship.

In step S950, if the second display driving channel 114 determines to drive the target driving sub-pixel with the gamma voltage V186, the display driving method proceeds to step S960. In step S960, the second display drive channel 114 drives the target drive subpixel with gamma voltage V186. In step S950, if the second display driving channel 114 determines not to use the gamma voltage V186 to drive the target driving sub-pixel, the display driving method proceeds to step S970. In step S970, the second display driving channel 114 drives the target driving sub-pixel with the gamma voltage V0 or V255.

In addition, the display driving method according to the embodiment of the invention can obtain sufficient teaching, suggestion and implementation descriptions from the descriptions of the embodiments in fig. 1 to fig. 18, and thus, the description is not repeated.

In summary, in the exemplary embodiments of the invention, the voltage value of at least one gamma voltage among the plurality of gamma voltages for driving the display panel is determined according to a proportional relationship, and the proportional relationship is determined according to the arrangement manner of the sub-pixels with different colors in different directions of the display panel. In the second display mode, the display driver according to the exemplary embodiment of the invention determines whether to drive the display panel by using the determined gamma voltage according to the boundary relationship between the sub-pixels, so as to achieve both display quality and energy saving.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit 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

1. A display driver for driving a display panel, the display panel being configured to display an image frame in a first display mode or a second display mode, the display driver comprising:

a first display driving channel, in the first display mode, driving the display panel to display the image picture by using a sub-pixel imaging method; and

a second display driving channel for driving the display panel to display the image picture by using the sub-pixel imaging method in the second display mode,

wherein the display panel comprises a subpixel repeating unit, and the subpixel repeating unit is repeatedly arranged to form the display panel, the subpixel repeating unit comprises a plurality of pixel units, each pixel unit comprises one to two subpixels,

in the second display mode, the second display driving channel drives the sub-pixels on the display panel to display corresponding gray-scale values by using a plurality of gamma voltages, and a voltage value of at least one gamma voltage among the gamma voltages is determined according to a first quantity proportion occupied by the color sub-pixels on the display panel in the sub-pixel repeating unit and a second quantity proportion occupied by the color sub-pixels on the sub-pixel repeating unit on the basis of the pixel unit.

2. The display driver of claim 1, wherein each pixel unit of the display panel comprises at least one of a first color sub-pixel, a second color sub-pixel and a third color sub-pixel, and a voltage value of the at least one gamma voltage among the gamma voltages is determined according to at least one ratio,

wherein the at least one proportional relationship is determined according to the first quantity ratio occupied by at least one of the first color sub-pixel, the second color sub-pixel and the third color sub-pixel on the first pixel row of the sub-pixel repeating unit and the second quantity ratio occupied by at least one of the first color sub-pixel, the second color sub-pixel and the third color sub-pixel on the second pixel repeating unit.

3. The display driver of claim 2, wherein the pixel units comprise a first pixel unit and a second pixel unit, the first color sub-pixel and the second color sub-pixel are adjacently arranged to form the first pixel unit, and the third color sub-pixel and the second color sub-pixel are adjacently arranged to form the second pixel unit.

4. The display driver of claim 2, wherein the pixel units comprise a first pixel unit, a second pixel unit and a third pixel unit, the first color sub-pixel and the second color sub-pixel are adjacently arranged to form the first pixel unit, the third color sub-pixel and the second color sub-pixel are adjacently arranged to form the second pixel unit, and the first color sub-pixel and the third color sub-pixel are adjacently arranged to form the third pixel unit.

5. The display driver of claim 2, wherein the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel are arranged adjacently to form two pixel units of the pixel units in the display panel.

6. The display driver of claim 2, wherein each pixel unit comprises a single sub-pixel in the display panel, and the single sub-pixel comprises the first color sub-pixel, the second color sub-pixel, or the third color sub-pixel.

7. The display driver of claim 2, wherein the first, second and third color sub-pixels are red, green and blue sub-pixels, respectively, in the display panel.

8. The display driver of claim 1, wherein the sub-pixels comprise a target driving sub-pixel, and in the second display mode, the second display driving channel determines whether to drive the target driving sub-pixel with the determined at least one gamma voltage according to a boundary relationship between the target driving sub-pixel and a plurality of sub-pixels adjacent to the target driving sub-pixel.

9. The display driver of claim 8, wherein the second display driving channel determines the boundary relationship according to the most significant bits of the sub-pixel data written into the target driving sub-pixel and the sub-pixels adjacent to the target driving sub-pixel.

10. The display driver of claim 9, wherein the second display drive channel comprises:

a data processing unit for determining the boundary relationship according to the most significant bit of the sub-pixel data written into the target driving sub-pixel and the sub-pixels adjacent to the target driving sub-pixel; and

a voltage output unit determining whether to drive the target driving subpixel by the determined at least one gamma voltage according to the boundary relationship between the target driving subpixel and a plurality of subpixels adjacent thereto.

11. The display driver of claim 1, wherein the gamma voltages comprise a first gamma voltage, a second gamma voltage and a third gamma voltage, and a voltage value of the third gamma voltage is determined according to the first quantity ratio of the color sub-pixels occupied by the color sub-pixels on the first pixel row of the sub-pixel repeating unit and the second quantity ratio of the color sub-pixels occupied by the color sub-pixels on the display panel on the first pixel row of the sub-pixel repeating unit,

wherein a voltage value of the first gamma voltage is less than a voltage value of the second gamma voltage, and a voltage value of the third gamma voltage is between the voltage values of the first gamma voltage and the second gamma voltage.

12. The display driver of claim 11, wherein the gamma voltages further comprise a fourth gamma voltage, and a voltage value of the fourth gamma voltage is further determined according to the first number ratio of the color sub-pixels on the display panel occupied by the first pixel row of the sub-pixel repeating unit and the second number ratio of the color sub-pixels on the sub-pixel repeating unit,

wherein a voltage value of the fourth gamma voltage is between voltage values of the first gamma voltage and the third gamma voltage.

13. The display driver of claim 11, further comprising:

and the selection unit selects and utilizes the first display driving channel or the second display driving channel to drive the display panel to display the image in the first display mode or the second display mode according to a selection signal.

14. A display device, comprising:

a display panel including a subpixel repeating unit repeatedly arranged to form the display panel, the subpixel repeating unit including a plurality of pixel units, each pixel unit including one to two subpixels, and the display panel to display an image picture in a first display mode or a second display mode; and

a display driver coupled to the display panel and including a first display driving channel and a second display driving channel for driving the display panel to display the image frame by using a sub-pixel imaging method,

15. The display device of claim 14, wherein each pixel unit of the display panel comprises at least one of a first color sub-pixel, a second color sub-pixel and a third color sub-pixel, and a voltage value of the at least one gamma voltage among the gamma voltages is determined according to at least one ratio,

wherein the at least one proportional relationship is determined according to a proportion of at least one of the first color sub-pixel, the second color sub-pixel and the third color sub-pixel in the sub-pixel repeating unit, based on the pixel unit, occupied on the first pixel column of the sub-pixel repeating unit and a proportion occupied on the column of the sub-pixel repeating unit.

16. The display device according to claim 15, wherein the pixel units comprise a first pixel unit and a second pixel unit, the first color sub-pixel and the second color sub-pixel are adjacently arranged to form the first pixel unit, and the third color sub-pixel and the second color sub-pixel are adjacently arranged to form the second pixel unit.

17. The display device according to claim 15, wherein the pixel units comprise a first pixel unit, a second pixel unit and a third pixel unit, the first color sub-pixel and the second color sub-pixel are adjacently arranged to form the first pixel unit, the third color sub-pixel and the second color sub-pixel are adjacently arranged to form the second pixel unit, and the first color sub-pixel and the third color sub-pixel are adjacently arranged to form the third pixel unit.

18. The display device according to claim 15, wherein the first color sub-pixel, the second color sub-pixel and the third color sub-pixel are adjacently arranged in the display panel to form two pixel units among the pixel units.

19. The display device according to claim 15, wherein each of the pixel units in the display panel includes a single sub-pixel, and the single sub-pixel includes the first color sub-pixel, the second color sub-pixel, or the third color sub-pixel.

20. The display device according to claim 15, wherein the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel are a red sub-pixel, a green sub-pixel, and a blue sub-pixel, respectively, in the display panel.

21. The display device according to claim 14, wherein the sub-pixels comprise a target driving sub-pixel, and in the second display mode, the second display driving channel determines whether to drive the target driving sub-pixel with the determined at least one gamma voltage according to a boundary relationship between the target driving sub-pixel and a plurality of sub-pixels adjacent to the target driving sub-pixel.

22. The display device according to claim 21, wherein the second display driving channel determines the boundary relationship according to most significant bits of sub-pixel data written into the target driving sub-pixel and the sub-pixels adjacent to the target driving sub-pixel.

23. The display device of claim 22, wherein the second display drive channel comprises:

a voltage output unit, coupled to the data processing unit, for determining whether to drive the target driving sub-pixel by using the determined at least one gamma voltage according to the boundary relationship between the target driving sub-pixel and a plurality of sub-pixels adjacent to the target driving sub-pixel.

24. The display device of claim 14, wherein the gamma voltages comprise a first gamma voltage, a second gamma voltage and a third gamma voltage, and a voltage value of the third gamma voltage is determined according to the first quantity ratio of the color sub-pixels on the first pixel row of the sub-pixel repeating unit and the second quantity ratio of the color sub-pixels on the second pixel row of the sub-pixel repeating unit on the display panel,

25. The display device of claim 24, wherein the gamma voltages further comprise a fourth gamma voltage, and a voltage value of the fourth gamma voltage is further determined according to the first number ratio of the color sub-pixels on the display panel occupied by the first pixel row of the sub-pixel repeating unit and the second number ratio of the color sub-pixels on the sub-pixel repeating unit,

26. The display device according to claim 25, wherein the display driver further comprises: