CN110945582B

CN110945582B - Sub-pixel rendering method, driving chip and display device

Info

Publication number: CN110945582B
Application number: CN201980002240.6A
Authority: CN
Inventors: 杨学炎
Original assignee: Chipone Technology Beijing Co Ltd
Current assignee: Chipone Technology Beijing Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2022-03-04
Anticipated expiration: 2039-10-31
Also published as: WO2021081954A1; KR20210054483A; CN110945582A; KR102314074B1

Abstract

The application discloses a sub-pixel rendering method, a driving chip and a display device. The sub-pixel rendering method comprises the steps of obtaining sub-pixel arrangement of a display panel; and adjusting the gray scale driving parameters of each image pixel according to the brightness rendering coefficient and the scaling coefficient to change the light emitting brightness of the corresponding sub-pixel, wherein the plurality of pixel units comprise a first pixel unit and a second pixel unit, the rendering unit of the first pixel unit only comprises the internal sub-pixel of the first pixel unit, and the rendering unit of the second pixel unit comprises the internal sub-pixel of the second pixel unit and the compensation sub-pixel of the adjacent first pixel unit. The sub-pixel rendering method can reduce the number of sub-pixels of the display panel, thereby reducing the design cost and the manufacturing cost.

Description

Sub-pixel rendering method, driving chip and display device

Technical Field

The invention relates to the technical field of display, in particular to a driving chip of a sub-pixel rendering method and a display device.

Background

The display panel includes a plurality of pixel units, each of which includes a plurality of sub-pixels, for example, the sub-pixels are respectively used for displaying one of three colors of red, green and blue. When displaying an image, the image pixels correspond to pixel units of the panel, and in each pixel unit, the display of the image pixels is realized through the brightness control of a plurality of sub-pixels with different colors, so that the display of a complete image can be realized by adopting a plurality of pixel units of the panel.

In an organic light emitting diode (abbreviated as OLED) display device, an organic light emitting diode is employed as a sub-pixel unit. Unlike the conventional liquid crystal display device, the OLED display device has high contrast, thin thickness, wide viewing angle, and flexibility, and thus has received much attention. The sub-pixel units of the OLED display device are active light emitting elements, and the number of sub-pixel units is related to cost. The high-resolution OLED display device requires a number of sub-pixel units corresponding to the resolution, and requires a reduction in the size of the sub-pixel units to achieve high-density integration, resulting in not only difficulty in manufacturing processes but also an increase in product cost.

A further improved method is to implement high resolution by using a sub-pixel rendering method, in which each pixel unit includes, for example, sub-pixel units of two colors, and a sub-pixel of a third color is shared from adjacent pixel units, so that the number of panel sub-pixel units can be reduced, and the process difficulty and the product cost can be reduced.

Since the subpixel rendering method is related to the subpixel arrangement, a specially designed driving circuit needs to be used for a specific subpixel arrangement. The arrangement of the sub-pixels of the OLED display devices of different manufacturers is different, and if the driving circuits are designed respectively, the design cost and the manufacturing cost of the driving circuits are increased.

Disclosure of Invention

In view of the above problems, an object of the present application is to provide a subpixel rendering method, a driving chip and a display device, wherein the number of subpixels is reduced by adopting the subpixel rendering method.

One aspect of the present application provides a sub-pixel rendering method for driving a plurality of pixel units of a display panel, each pixel unit including a plurality of sub-pixels of different colors, the method including:

obtaining a sub-pixel arrangement of a display panel;

obtaining a rendering unit of the pixel unit and a brightness rendering coefficient and a scaling coefficient of the corresponding sub-pixel according to the arrangement of the sub-pixels and the positions of the pixel unit, and

adjusting the gray scale driving parameters of each image pixel according to the brightness rendering coefficient and the scaling coefficient to change the light emitting brightness of the corresponding sub-pixel,

the plurality of pixel units comprise a first pixel unit and a second pixel unit, the rendering unit of the first pixel unit comprises an internal sub-pixel, and the rendering unit of the second pixel unit comprises an internal sub-pixel and a compensation sub-pixel of an adjacent pixel unit.

Preferably, the sub-pixel arrangement of the display panel is a periodic structure repeating 1 blue sub-pixel, 2 green sub-pixels arranged in a column direction, and 2 red sub-pixels arranged in a column direction in a row direction, and the sub-pixel density of the display panel includes 2 red sub-pixels, 2 green sub-pixels, and 1 blue sub-pixel per 2 pixel units.

Preferably, the green sub-pixel and the red sub-pixel have the same density and half of the density of the blue sub-pixel, wherein the density of the sub-pixels is related to the light emitting brightness.

Preferably, the first pixel unit includes 1 blue sub-pixel, 1 green sub-pixel, and 1 red sub-pixel adjacent to each other, the second pixel unit includes 1 green sub-pixel and 1 red sub-pixel adjacent to each other, and the rendering unit of the second pixel unit obtains 1 blue sub-pixel from the adjacent first pixel unit as the compensation sub-pixel.

Preferably, the rendering units of the first pixel unit and the second pixel unit respectively obtain the brightness rendering coefficients of the sub-pixels according to the following formulas:

BR:BG:BB＝x:x:1/2*x (1),

wherein BR, BG, BB denote luminance rendering coefficients of the red, green, and blue sub-pixels, respectively, and x denotes a scaling coefficient.

Preferably, the scaling factor x is the ratio of the maximum value of the gray-scale driving current to the maximum value of the system driving current, and 1/2 ≦ x ≦ 1.

Preferably, the sub-pixel arrangement of the display panel is a periodic structure in which 1 red sub-pixel, 2 green sub-pixels arranged in a column direction, and 2 blue sub-pixels arranged in a column direction are repeated in a row direction, and the sub-pixel density of the display panel includes 1 red sub-pixel, 2 green sub-pixels, and 2 blue sub-pixels per 2 pixel units.

Preferably, the green sub-pixel and the blue sub-pixel have the same density and half of the density of the red sub-pixel, wherein the density of the sub-pixels is related to the light emitting brightness.

Preferably, the first pixel unit includes 1 red sub-pixel, 1 green sub-pixel, and 1 blue sub-pixel adjacent to each other, the second pixel unit includes 1 green sub-pixel and 1 blue sub-pixel adjacent to each other, and the rendering unit of the second pixel unit obtains 1 red sub-pixel from the adjacent first pixel unit as the compensation sub-pixel.

Preferably, the first pixel unit and the second pixel unit respectively obtain the brightness rendering coefficient of each sub-pixel according to the following formula:

BR:BG:BB＝1/2*x:x:x (3),

Preferably, the sub-pixel arrangement of the display panel is a periodic structure in which 1 blue sub-pixel, 1 red sub-pixel and 1 green sub-pixel arranged in a column direction are repeated in a row direction, and the sub-pixel density of the display panel includes 5 red sub-pixels, 5 green sub-pixels and 5 blue sub-pixels per 6 pixel units.

Preferably, the red sub-pixel, the green sub-pixel and the blue sub-pixel are equal in density, wherein the density of the sub-pixels is related to the light emitting brightness.

Preferably, the plurality of pixel units further includes third to sixth pixel units, the rendering units of the third to sixth pixel units each include an internal sub-pixel and a compensation sub-pixel of an adjacent pixel unit,

the first pixel unit includes 1 red subpixel and 1 green subpixel arranged in a column direction, and 1 adjacent blue subpixel,

the second pixel unit includes 1 red sub-pixel and 1 green sub-pixel arranged in a column direction;

the third pixel unit comprises 1 blue sub-pixel, and 1 red sub-pixel and 1 green sub-pixel which are arranged adjacently along the column direction;

the fourth pixel unit and the fifth pixel unit respectively comprise a blue sub-pixel, and 1 red sub-pixel and 1 green sub-pixel which are arranged along the column direction;

the sixth pixel unit includes 1 red subpixel and 1 green subpixel arranged in a column direction, and 1 blue subpixel adjacent thereto,

the rendering units of the second through sixth pixel units obtain at least one blue sub-pixel from adjacent pixel units such that the corresponding rendering unit includes 1 red sub-pixel, 1 green sub-pixel, and 2 blue sub-pixels.

Preferably, the first pixel unit obtains the luminance rendering coefficient of each sub-pixel according to the following formula:

BR:BG:BB＝5/6*x:5/6*x:5/6*x (5),

Preferably, the second pixel unit to the sixth pixel unit respectively obtain the luminance rendering coefficients of the respective sub-pixels according to the following formulas:

BR:BG:BB＝5/6*x:5/6*x:5/12*x (6),

Preferably, the scaling factor x is the ratio of the maximum value of the gray-scale driving current to the maximum value of the system driving current, and 1/10 ≦ x ≦ 1.

This application another aspect provides a driver chip, is applied to display panel, includes:

the first storage unit is used for locally storing preset parameters of the display panel or receiving and storing configuration parameters of the display panel from a host;

the second storage unit is used for storing rendering units of pixel units of different display panels and corresponding brightness rendering coefficients and scaling coefficients; and

an image processing unit connected to the first storage unit and the second storage unit, and performing the following processing when executing an instruction:

obtaining a sub-pixel arrangement mode of the display panel;

obtaining a rendering unit of the pixel unit and corresponding brightness rendering coefficients and scaling coefficients according to the arrangement of the sub-pixels and the position of the pixel unit, wherein the rendering unit comprises internal sub-pixels of the pixel unit and a plurality of compensation pixels adjacent to the pixel unit; mapping the color component of each image pixel to a gray-scale value of each sub-pixel of the rendering unit of the pixel unit; and

the plurality of pixel units comprise a first pixel unit and a second pixel unit, the rendering unit of the first pixel unit comprises an internal sub-pixel of the first pixel unit, and the rendering unit of the second pixel unit comprises an internal sub-pixel of the second pixel unit and a compensation sub-pixel of the adjacent first pixel unit.

Preferably, the driving parameter includes at least one of a driving current, a driving voltage and a duty ratio corresponding to the gray-scale signal.

Preferably, the display panel is one of a liquid crystal display panel and an organic light emitting diode display panel.

Another aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the above-described sub-pixel rendering method.

Another aspect of the present application provides a display device, which includes the driving chip.

According to the sub-pixel rendering method provided by the embodiment of the invention, the rendering unit of the pixel unit and the corresponding brightness rendering coefficient and scaling coefficient are obtained according to the sub-pixel arrangement of the display panel so as to be suitable for the display panels with different sub-pixel arrangements, and at least a part of the pixel units share the sub-pixels of the adjacent pixel units so as to reduce the number of the sub-pixels of the display panel, so that the design cost and the manufacturing cost can be reduced.

Drawings

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

Fig. 1 shows a schematic diagram of a first type of sub-pixel arrangement of a display panel and a pixel unit thereof according to the prior art.

Fig. 2 shows a schematic diagram of a second type of sub-pixel arrangement of a display panel and a pixel unit thereof according to the prior art.

Fig. 3 is a schematic diagram of a pixel unit of a third type of sub-pixel arrangement and one division thereof according to an embodiment of the invention.

Fig. 4a and 4b illustrate a sub-pixel rendering method of a first pixel unit and a second pixel unit, respectively, in the sub-pixel arrangement shown in fig. 3.

Fig. 5 is a schematic diagram of a pixel unit of a third type of sub-pixel arrangement and another division thereof according to an embodiment of the present invention.

Fig. 6a and 6b illustrate a sub-pixel rendering method of a first pixel unit and a second pixel unit, respectively, in the sub-pixel arrangement shown in fig. 5.

Fig. 7 is a schematic diagram of a pixel unit of a third type of sub-pixel arrangement and another division thereof according to an embodiment of the present invention.

Fig. 8a and 8b illustrate a sub-pixel rendering method of a first pixel unit and a second pixel unit, respectively, in the sub-pixel arrangement shown in fig. 7.

Fig. 9 shows a schematic diagram of a fourth type sub-pixel arrangement and a pixel unit thereof in an alternative embodiment according to an embodiment of the invention.

Fig. 10a and 10b illustrate a sub-pixel rendering method of a first pixel unit and a second pixel unit, respectively, in the sub-pixel arrangement shown in fig. 9.

Fig. 11 illustrates a second-type sub-pixel arrangement of a display panel and a schematic diagram of a pixel unit thereof according to an embodiment of the present invention.

Fig. 12a and 12b illustrate a sub-pixel rendering method of the first pixel unit and the second to sixth pixel units, respectively, in the sub-pixel arrangement shown in fig. 11.

FIG. 13 shows a flow diagram of a sub-pixel rendering method according to an embodiment of the invention.

Fig. 14 shows a schematic block diagram of a display apparatus according to an embodiment of the present invention.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The present invention will be described in detail below with reference to the accompanying drawings.

The display panel 100 includes a plurality of red subpixels 101, a plurality of blue subpixels 102, and a plurality of green subpixels 103 arranged in an array by rows and columns. In the same row, the arrangement of the plurality of subpixels is a periodic structure in which 1

red subpixel

101, 1 blue subpixel 102, and 2 green subpixels 103 arranged in the column direction are repeated. In the same column, a plurality of red subpixels 101 and a plurality of blue subpixels 102 are arranged in a column, or a plurality of green subpixels 103 are arranged in a column.

The display panel 100 described above includes, for example, two types of pixel units. The first pixel unit P1 includes 1

red sub-pixel

101 and 1 adjacent green sub-pixel 103, for example, 1 green sub-pixel 103 in the same row or in an adjacent row. The first pixel cell P1 lacks the blue sub-pixel 102, and thus, the blue sub-pixel 102 needs to be shared from the adjacent second pixel cell P2 at the time of display driving. The second pixel unit P2 includes 1

blue sub-pixel

102 and 1 adjacent green sub-pixel 103, for example, 1 green sub-pixel 103 in the same row or in an adjacent row. The second pixel unit P2 lacks the red sub-pixel 101, and thus, the red sub-pixel 101 needs to be shared from the adjacent first pixel unit P1 at the time of display driving.

During operation, for example, a scan signal is provided to the scan lines row by row to select the sub-pixels in the corresponding row, and corresponding gray scale data is provided to the sub-pixels in the corresponding column through the plurality of data lines, so that the light emitting brightness of the plurality of sub-pixels is consistent with the gray scale data.

Preferably, the density of the red sub-pixel 101 is equal to that of the blue sub-pixel 102, and the density of the green sub-pixel 103 is half that of the red sub-pixel 101. The density of the sub-pixels is, for example, related to the light emission luminance, and the sub-pixel density is large, the light emission luminance thereof is high, and the screen display fineness is high. For example, in an OLED display device, a sub-pixel is composed of an active light emitting element. The rendering coefficient of the gray-scale data of the single red subpixel 101 and the single blue subpixel 102 is, for example, 1/2, the rendering coefficient of the single green subpixel 103 is, for example, 1, and the light emission luminances of the three color subpixels are equalized to each other.

The display panel 200 includes a plurality of red subpixels 201, a plurality of blue subpixels 202, and a plurality of green subpixels 203 arranged in an array of rows and columns. In the same row, the arrangement of the plurality of sub-pixels is a periodic structure repeating 1

red sub-pixel

201 and 1

green sub-pixel

203, and 1 blue sub-pixel 202 arranged in the column direction. In the same column, a plurality of red subpixels 201, a plurality of green subpixels 203, and a plurality of blue subpixels 202 are sequentially arranged in a column.

The display panel 200 includes three types of pixel units, for example. The first pixel unit P1 includes 1

red sub-pixel

201 and 1 adjacent green sub-pixel 203, for example, 1 green sub-pixel 203 on the same row or on an adjacent row. The first pixel cell P1 lacks the blue sub-pixel 202, and thus, the blue sub-pixel 202 needs to be shared from the adjacent second pixel cell P2 at the time of display driving. The second pixel unit P2 includes 1

blue sub-pixel

202 and 1 adjacent red sub-pixel 201, for example, 1 red sub-pixel 201 in the same row or in an adjacent row. The second pixel unit P2 lacks the green sub-pixel 203, and thus, the green sub-pixel 203 needs to be shared from the adjacent third pixel unit P3 at the time of display driving. The third pixel unit P3 includes 1 green sub-pixel 203 and an adjacent blue sub-pixel 202, such as 1 blue sub-pixel 202 in the same row or an adjacent row. The third pixel cell P3 lacks the red subpixel 201, and thus, the red subpixel 201 needs to be shared from the adjacent first pixel cell P1 at the time of display driving.

Preferably, the density of the red, blue and

green sub-pixels

201, 202 and 203 is equal. The density of the sub-pixels is, for example, related to the light emission luminance, and the sub-pixel density is large, the light emission luminance thereof is high, and the screen display fineness is high. For example, in an OLED display device, a sub-pixel is composed of an active light emitting element. The rendering coefficients of the single red subpixel 201, the single blue subpixel 202, and the single green subpixel 203 are, for example, 1, and the light emission luminances of the three color subpixels are equalized to each other.

The display panel 300 includes a plurality of red subpixels 301, a plurality of blue subpixels 302, and a plurality of green subpixels 303 arranged in an array by rows and columns. In the same row, the arrangement of the plurality of sub-pixels is a periodic structure repeating 1 blue sub-pixel 302, 2 green sub-pixels 303 arranged in the column direction, and 2 red sub-pixels 301 arranged in the column direction. In the same column, a plurality of red subpixels 301 and a plurality of blue subpixels 302 are arranged in a column, or a plurality of green subpixels 303 are arranged in a column.

The display panel 300 described above includes, for example, two types of pixel units. The first pixel unit P1 includes 1

blue sub-pixel

302 and 1 adjacent green sub-pixel 303 and one red sub-pixel 301, for example, 1

blue sub-pixel

302, 1 green sub-pixel 303 below the right side, and 1 red sub-pixel 301 above the right side of the current row. The first pixel cell P1 includes three color sub-pixels, and thus, it is not necessary to share any color sub-pixel from the adjacent first pixel cell P1 at the time of display driving. The second pixel unit P2 includes 1

red sub-pixel

301 and 1 adjacent green sub-pixel 303, for example, 1 red sub-pixel 301 below the current row and 1 green sub-pixel 303 above the right side of the adjacent row. The second pixel unit P2 lacks the blue sub-pixel 302, and thus, the blue sub-pixel 302 needs to be shared from the adjacent first pixel unit P1 at the time of display driving.

The sub-pixel density of the display panel 300 is such that every 3 pixel units includes 2 red sub-pixels, 2 green sub-pixels, and 2 blue sub-pixels.

In the display panel 300 shown in fig. 3, two pixel units P1 and P2 adjacent to each other share 2 red subpixels 301, 2

green subpixels

303, and 1 blue subpixel. The single-point luminance of each pixel unit is, for example, 1 for the red and green sub-pixels, respectively, and 1/2 for the blue sub-pixel.

Preferably, the density of the red sub-pixel 301 is equal to that of the green sub-pixel 303, and is half of that of the blue sub-pixel 302. The density of the sub-pixels is, for example, related to the light emission luminance, and the sub-pixel density is large, the light emission luminance thereof is high, and the screen display fineness is high. For example, in an OLED display device, a sub-pixel is composed of an active light emitting element. The rendering coefficient of the gradation data of the single blue sub-pixel 302 is, for example, 1/2, the rendering coefficients of the single red sub-pixel 301 and the single green sub-pixel 303 are, for example, 1, and the light emission luminances of the three color sub-pixels are equalized to each other.

Fig. 4a illustrates a sub-pixel rendering method of the first pixel unit in the sub-pixel arrangement shown in fig. 3.

The first pixel cell P1 includes sub-pixels of all three colors without sharing any color sub-pixel from the adjacent second pixel cell P2. The red, green, and blue sub-pixels inside the second pixel unit P2 constitute the rendering unit 131, and the blue sub-pixel 302 needs to be shared from the adjacent first pixel unit P1.

The formula of the rendering unit 141 of the first pixel unit P1 is expressed as:

BR:BG:BB＝x:x:1/2*x (1),

The scaling factor x is, for example, the ratio of the maximum gray-scale driving current to the maximum system driving current, such as 1/2 ≦ x ≦ 1.

For example, in a case where the maximum value of the system driving current is 100mA and the scaling factor x is 1/2, the gray scale data displayed by the first pixel unit P1 is (10,10,10), and the gray scale driving currents of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the rendering unit 131 of the first pixel unit P1 are 1.96mA, and 0.98mA, respectively.

Fig. 4b illustrates a sub-pixel rendering method of the second pixel unit in the sub-pixel arrangement shown in fig. 3.

The red and green sub-pixels inside the second pixel unit P2, and the adjacent compensation sub-pixels constitute the rendering unit 132. As shown, the compensated sub-pixel of the first pixel cell P1 includes a blue sub-pixel of a right-most neighboring first pixel cell P1.

The formula of the rendering unit 132 of the second pixel unit P2 is expressed as:

BR:BG:BB＝x:x:1/2*x (2),

For example, in a case where the maximum value of the system driving current is 100mA and the scaling factor x is 1/2, the gray scale data displayed by the second pixel unit P2 is (10,10,10), and the gray scale driving currents of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the rendering unit 132 of the second pixel unit P2 are 1.96mA, and 0.98mA, respectively.

The arrangement of the sub-pixels of the display panel shown in fig. 5 is the same as that of the display panel shown in fig. 3, and the detailed description thereof is different.

Further, the inner sub-pixels of the two pixel cells P1 and P2 of the display panel shown in fig. 5 are different from the inner sub-pixels of the two pixel cells P1 and P2 of the display panel shown in fig. 3.

The first pixel unit P1 includes 1

blue sub-pixel

302, and 1 adjacent green sub-pixel 303 and one red sub-pixel 301, for example, 1 blue sub-pixel 302 of the current row, 1 green sub-pixel 303 above the right side, and 1 red sub-pixel 301 above the right side and in the same row as the green sub-pixel 303. The first pixel cell P1 includes three color sub-pixels, and thus, it is not necessary to share any color sub-pixel from the adjacent second pixel cell P2 at the time of display driving. The second pixel unit P2 includes 1

red sub-pixel

301 and 1 adjacent green sub-pixel 303, such as 1 adjacent and above

green sub-pixel

303 and 1 red sub-pixel 301 of the current row. The second pixel unit P2 lacks the blue sub-pixel 302, and thus, the blue sub-pixel 302 needs to be shared from the adjacent first pixel unit P1 at the time of display driving.

The sub-pixel density of the display panel 400 is such that every 3 pixel units comprises 2 red sub-pixels, 2 green sub-pixels and 2 blue sub-pixels.

In the display panel 400 shown in fig. 5, two pixel units P1 and P2 adjacent to each other share 2 red subpixels 301, 2

green subpixels

303, and 1 blue subpixel.

Fig. 6a illustrates a sub-pixel rendering method of the first pixel unit in the sub-pixel arrangement shown in fig. 5.

As shown, the first pixel cell P1 includes sub-pixels of all three colors, and there is no need to share sub-pixels of any color from the adjacent second pixel cell P2. The red, green and blue sub-pixels inside the first pixel unit P1 constitute the rendering unit 141. The formula of the rendering unit 141 of the first pixel unit P1 is the same as the above formula (1), and is not described in detail here.

Fig. 6b illustrates a sub-pixel rendering method of the second pixel unit in the sub-pixel arrangement shown in fig. 5.

As shown, the red and green sub-pixels inside the second pixel unit P2 and the adjacent compensation sub-pixels constitute the rendering unit 142. As shown, the compensated sub-pixel of the second pixel cell P2 includes a blue sub-pixel of the right-most neighboring first pixel cell P1. The formula of the rendering unit 142 of the second pixel unit P2 is the same as the above formula (2), and is not described in detail here.

The arrangement of the sub-pixels of the display panel shown in fig. 7 is the same as that of the display panel shown in fig. 3 and 5, and will not be described in detail.

Further, the internal sub-pixels of the two pixel cells P2 of the display panel shown in fig. 7 are different from the internal sub-pixels of the pixel cell P2 of the display panel shown in fig. 5.

The first pixel unit P1 includes 1

blue sub-pixel

302 and 1 adjacent green sub-pixel 303 and one red sub-pixel 301, for example, 1 blue sub-pixel 302 of the current row, 1 green sub-pixel 303 above the right side, and 1 red sub-pixel 301 above the left side and the green sub-pixel 303. The first pixel cell P1 includes three color sub-pixels, and thus, it is not necessary to share any color sub-pixel from the adjacent second pixel cell P2 at the time of display driving. The second pixel unit P2 includes 1

red sub-pixel

301 and 1 adjacent green sub-pixel 303, such as 1 adjacent and above

green sub-pixel

The sub-pixel density of the display panel 500 is such that each 2 pixel units comprises 2 red sub-pixels, 2 green sub-pixels and 1 blue sub-pixel.

Fig. 8a illustrates a sub-pixel rendering method of the first pixel unit in the sub-pixel arrangement shown in fig. 7.

As shown, the first pixel cell P1 includes sub-pixels of all three colors, and there is no need to share sub-pixels of any color from the adjacent second pixel cell P2. The red, green and blue sub-pixels inside the first pixel unit P1 constitute the rendering unit 151. The formula of the rendering unit 151 of the first pixel unit P1 is the same as the above formula (1), and is not described in detail herein.

Fig. 8b illustrates a sub-pixel rendering method of the second pixel unit in the sub-pixel arrangement shown in fig. 7.

As shown, the red and green sub-pixels inside the second pixel unit P2 and the adjacent compensation sub-pixels constitute the rendering unit 152. As shown, the compensated sub-pixel of the second pixel cell P2 includes a blue sub-pixel of the right-most neighboring first pixel cell P1. The formula of the rendering unit 152 of the second pixel unit P2 is the same as the above formula (2), and is not described in detail here.

In the above-described embodiment, the sub-pixel arrangement of the display panel shown in fig. 3, 5, and 7 is a periodic structure in which 1 blue sub-pixel 302, 2 green sub-pixels 303 arranged in the column direction, and 2 red sub-pixels 301 arranged in the column direction are repeated.

In an alternative embodiment, as shown in fig. 9, the display panel 600 employs a sub-pixel arrangement of the fourth type, i.e., a periodic structure repeating 1 red sub-pixel 301 in the row direction, 2 green sub-pixels 303 in the column direction, and 2 blue sub-pixels 302 in the column direction.

The first pixel unit P1 includes 1 red sub-pixel 601 and adjacent 1

green sub-pixel

603 and 1 blue sub-pixel 602, for example, 1 red sub-pixel 601 of the current row, 1 green sub-pixel 603 below the right side, and 1 blue sub-pixel 602 below the left side and the red sub-pixel 601 in the same row. The formula of the rendering unit 161 of the first pixel unit P1 is expressed as:

BB:BR:BG＝x:1/2*x:x (3),

The second pixel unit P2 includes 1

blue sub-pixel

602 and 1 adjacent green sub-pixel 603, such as 1 blue sub-pixel 602 below the current row and 1 green sub-pixel 603 above the right side of the adjacent row. The formula of the rendering unit 162 of the second pixel unit P2 is expressed as:

BG:BB:BR＝x:x:1/2*x (4),

Fig. 10a illustrates a sub-pixel rendering method of the first pixel unit in the sub-pixel arrangement shown in fig. 9.

As shown, the first pixel cell P1 includes sub-pixels of all three colors, and there is no need to share sub-pixels of any color from the adjacent second pixel cell P2. The red subpixel 601, the green subpixel 603, and the blue subpixel 602 inside the first pixel unit P1 constitute the rendering unit 161. The formula of the rendering unit 161 of the first pixel unit P1 is the same as the above formula (3), and is not described in detail here.

Fig. 10b illustrates a sub-pixel rendering method of the second pixel unit in the sub-pixel arrangement shown in fig. 9.

As shown, the blue subpixel 602 and the green subpixel 603 in the second pixel unit P2 and the adjacent compensation subpixel constitute the rendering unit 162. As shown, the compensated sub-pixel of the second pixel cell P2 includes the blue sub-pixel 603 of the right-most neighboring first pixel cell P1. The formula of the rendering unit 162 of the second pixel unit P2 is the same as the above formula (4), and is not described in detail here.

The display panel 700 includes a plurality of red subpixels 701, a plurality of blue subpixels 702, and a plurality of green subpixels 703 arranged in an array of rows and columns. In the same row, the arrangement of the plurality of sub-pixels is a periodic structure repeating 1

red sub-pixel

701 and 1

green sub-pixel

703, and 1 blue sub-pixel 702 arranged in the column direction. In the same column, a plurality of red sub-pixels 701, a plurality of green sub-pixels 703, and a plurality of blue sub-pixels 702 are sequentially arranged in a column.

The display panel 700 described above includes, for example, six types of pixel units. The first through sixth pixel cells P1 through P6 divide physical areas of 5 original three-color pixel cells. The first pixel unit P1 includes 1

red subpixel

701 and 1 green subpixel 703 arranged in the column direction, and 1 adjacent blue subpixel 702. The second pixel unit P2 includes 1

red subpixel

701 and 1 green subpixel 703 arranged in the column direction, and lacks 1 blue subpixel 702. The third pixel unit P3 includes 1

blue subpixel

702, and 1

red subpixel

701 and 1 green subpixel 703 arranged adjacent in the column direction. The fourth pixel unit P4 and the fifth pixel unit P5 respectively include a respective

blue sub-pixel

702, and 1

red sub-pixel

701 and 1 green sub-pixel 703, both of which are arranged in the column direction. The sixth pixel unit P6 includes 1

red subpixel

701 and 1 green subpixel 703 arranged in the column direction, and 1 adjacent blue subpixel 702. The first pixel unit P1 uses the three-color sub-pixels therein to realize color display, and the second pixel unit P2 through the sixth pixel unit P6 share the blue sub-pixel 702 from the adjacent pixel units, respectively.

The sub-pixel density of the display panel 700 is such that every 6 pixel units comprises 5 red sub-pixels, 5 green sub-pixels and 5 blue sub-pixels.

In the display panel 700 shown in fig. 11, six pixel units P1 through P6 adjacent to each other share 5

red subpixels

701, 5

green subpixels

703, and 5 blue subpixels 702. The single-point luminance of each pixel unit is 5/6 for example for red, green and blue sub-pixels.

Preferably, the density of the red subpixel 701, the blue subpixel 702 and the green subpixel 703 is equal. The density of the sub-pixels is, for example, related to the light emission luminance, and the sub-pixel density is large, the light emission luminance thereof is high, and the screen display fineness is high. For example, in an OLED display device, a sub-pixel is composed of an active light emitting element. The rendering coefficients of the single red subpixel 701, the single blue subpixel 702, and the single green subpixel 703 are, for example, 1, and the light emission luminances of the three color subpixels are equalized to each other.

Fig. 12a illustrates a sub-pixel rendering method of the first pixel unit in the sub-pixel arrangement shown in fig. 11.

The red and green sub-pixels and the blue sub-pixel inside the first pixel unit P1 constitute the rendering unit 171. As shown, the first pixel unit P1 includes three-color sub-pixels, and compensation sub-pixels are not required to be obtained from adjacent pixel units. The rendering unit 171 includes 1 red subpixel, 1 green subpixel, and 1 blue subpixel.

The formula of the rendering unit 171 of the first pixel unit P1 is expressed as:

BR:BG:BB＝5/6*x:5/6*x:5/6*x (5),

The scaling factor x is, for example, the ratio of the maximum value of the gray-scale driving current to the maximum value of the system driving current, such as 1/10 ≦ x ≦ 1, preferably x equals to any of 1/10, 3/10, 5/10, 6/10, 1.

For example, in a case where the maximum value of the system driving current is 100mA and the scaling factor x is 5/10, if the gray-scale data displayed by the first pixel unit P1 is (10,10,10), the gray-scale driving currents of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the rendering unit 171 of the first pixel unit P1 are 1.63mA, and 1.63mA, respectively.

Fig. 12b illustrates a sub-pixel rendering method in the sub-pixel arrangement shown in fig. 11 and the second to sixth pixel units.

The second pixel units P2 to P6 respectively form the rendering unit 172 with the adjacent compensation sub-pixels. As shown, the compensation sub-pixels of the second pixel units P2-P6 are, for example, a part or all of the red, green and blue sub-pixels of the adjacent pixel units. The rendering unit 172 includes 1 red subpixel, 1 green subpixel, and 2 blue subpixels.

The formula of the rendering unit 172 of the second pixel units P2 through P6 is expressed as:

BR:BG:BB＝5/6*x:5/6*x:5/12*x (6),

For example, in a case where the maximum value of the system driving current is 100mA and the scaling factor x is 5/10, the gray scale data displayed by the first pixel unit P1 is (10,10,10), and the gray scale driving currents of the red, green, and blue sub-pixels of the rendering units 152 of the second pixel units P2 to P6 are 1.63mA, and 0.82mA, respectively.

FIG. 13 shows a flow diagram of a sub-pixel rendering method according to an embodiment of the invention. The sub-pixel rendering method is implemented by using a general driving chip, for example, and is used for driving various display panels. The display panel includes a plurality of pixel units, each including a plurality of sub-pixels of different colors.

In step S01, a subpixel arrangement of the display panel is obtained.

In the third type of sub-pixel arrangement shown in fig. 3, 5 and 7, the plurality of sub-pixels of the display panel are arranged in an array in rows and columns, and in the same row, the arrangement of the plurality of sub-pixels is a periodic structure repeating 1 blue sub-pixel, 2 red sub-pixels arranged in the column direction, and 2 green sub-pixels arranged in the column direction. The sub-pixel arrangement of the display panel is a periodic structure in which a first pixel unit and a second pixel unit are repeatedly arranged in a row direction.

In the third type of sub-pixel arrangement, if the first division manner is adopted, the first pixel unit includes 1 blue sub-pixel on the current row, 1 green sub-pixel on the lower right side, and 1 red sub-pixel on the upper right side, and the second pixel unit includes 1 red sub-pixel 301 on the lower current row and 1 green sub-pixel on the upper right side of the adjacent row, as shown in fig. 3.

In the third type of sub-pixel arrangement, if the second division manner is adopted, the first pixel unit includes 1 blue sub-pixel, 1 green sub-pixel above the right side, and 1 red sub-pixel above the right side and in the same row as the green sub-pixel, and the second pixel unit includes 1 green sub-pixel and 1 red sub-pixel adjacent to each other and below the current row, as shown in fig. 5.

In the third sub-pixel arrangement, if the third division is adopted, the first pixel unit includes 1 blue sub-pixel, 1 green sub-pixel at the upper right side, and 1 red sub-pixel at the same row as the green sub-pixel at the upper left side, and the second pixel unit includes 1 green sub-pixel and 1 red sub-pixel adjacent to each other and at the lower side of the current row, as shown in fig. 7.

In an alternative embodiment, as shown in fig. 9, the display panel 600 adopts a fourth type of sub-pixel arrangement, that is, a periodic structure of 1 red sub-pixel, 2 green sub-pixels arranged along the column direction, and 2 blue sub-pixels arranged along the column direction are repeated in the row direction, and the pixel unit thereof can refer to the three division methods in the above-mentioned embodiment, and a division method similar to that shown in fig. 7 is given here, and other division methods can be obtained by those skilled in the art without creative efforts.

In the second type of sub-pixel arrangement shown in fig. 11, a plurality of sub-pixels of the display panel are arranged in an array in rows and columns, and the arrangement of the plurality of sub-pixels is a periodic structure in which 1 red sub-pixel and 1 green sub-pixel, and 1 blue sub-pixel arranged in a column direction are repeated in the same row. The sub-pixel arrangement of the display panel is a periodic structure in which a first pixel unit and a second pixel unit are repeatedly arranged in a row direction.

In the second type sub-pixel arrangement described above, the first to sixth pixel units divide the physical area of 5 original three-color pixel units, as shown in fig. 11.

In step S02, a rendering unit of the pixel unit and a corresponding luminance rendering coefficient are obtained according to the arrangement of the sub-pixels and the position of the pixel unit, where the rendering unit includes all the sub-pixels of the pixel unit, and if the pixel unit lacks color, the rendering unit further includes a compensation sub-pixel of an adjacent pixel unit for supplementing the missing color.

In the third type of sub-pixel arrangement, as shown in fig. 3, 5 and 7, the rendering unit of the first pixel unit includes sub-pixels of all three colors regardless of whether the first division manner, the second division manner or the third division manner is adopted, and there is no need to share sub-pixels of any color from adjacent first pixel units. According to the formula (1), the luminance rendering coefficients of the red sub-pixel, the green sub-pixel and the blue sub-pixel of the rendering unit of the first pixel unit can be calculated, so that the corrected gray-scale driving current can be calculated. The rendering units of the second pixel units each acquire a blue sub-pixel from an adjacent second pixel unit as a compensation sub-pixel. According to the above formula (2), the luminance rendering coefficients of the red, green, and blue sub-pixels of the rendering unit of the second pixel unit can be calculated.

In the above-described alternative embodiment of the third type of sub-pixel arrangement, whether the third division manner similar to that in fig. 7 is adopted, as shown in fig. 9, or the first division manner and the second division manner are adopted, the rendering unit of the first pixel unit includes sub-pixels of all three colors, and there is no need to share sub-pixels of any color from adjacent first pixel units. According to the formula (3), the luminance rendering coefficients of the red sub-pixel, the green sub-pixel and the blue sub-pixel of the rendering unit of the first pixel unit can be calculated, so that the corrected gray-scale driving current can be calculated. The rendering units of the second pixel units each acquire a blue sub-pixel from an adjacent second pixel unit as a compensation sub-pixel. According to the above equation (4), the luminance rendering coefficients of the red, green, and blue sub-pixels of the rendering unit of the second pixel unit can be calculated.

In the second-type sub-pixel arrangement described above, as shown in fig. 11, the sub-pixel of the first pixel unit itself constitutes the rendering unit, and the rendering units of the second to sixth pixel units each acquire a part of the sub-pixel from the adjacent pixel unit as the compensation sub-pixel to constitute the rendering unit. The rendering unit of the first pixel unit includes, for example, 1 red sub-pixel, 1 green sub-pixel, and 1 blue sub-pixel, and according to the above formula (5), the luminance rendering coefficients of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the rendering unit of the corresponding pixel unit can be calculated, so as to calculate the modified grayscale driving current. The rendering units of the second to sixth pixel units respectively include, for example, 1 red subpixel, 1 green subpixel, and 2 blue subpixels, and according to the above formula (6), luminance rendering coefficients of the red subpixel, the green subpixel, and the blue subpixel of the rendering units of the second to sixth pixel units can be calculated.

In step S03, the color component of each image pixel is mapped to the gray-scale values of the three-color sub-pixels of the rendering unit corresponding to the pixel unit according to the luminance rendering coefficient provided by the formula.

In step S04, a gray-scale driving parameter (e.g., a gray-scale driving current) of each image pixel is adjusted according to the luminance rendering coefficient and the scaling coefficient, so as to calculate a modified gray-scale driving current, and then change the luminance of the corresponding sub-pixel.

According to the sub-pixel rendering method provided by the embodiment of the invention, the driving chip can be suitable for display panels with different sub-pixel arrangements, so that the design cost and the manufacturing cost can be reduced.

As shown, the display device 10 includes a display panel 11 and a driving chip 12. The display panel 11 is, for example, an OLED (organic light emitting diode) display panel or a liquid crystal display panel.

The display panel 11 includes scan lines 21, data lines 22, a plurality of sub-pixels 23, and a scan circuit 25. The sub-pixels 23 are disposed at intersections of the scan lines 21 and the data lines 22, and are configured to display one of red, green, and blue colors. When an OLED display panel is used as the display panel 11, in one embodiment, the sub-pixel 23 displaying red may include a light emitting element emitting red light, the sub-pixel 23 displaying green may include a light emitting element emitting green light, and the sub-pixel 23 displaying blue may include a light emitting element emitting blue light.

The driver chip 12 receives image data 41 and control data 42 from a host. The image data 41 includes color values of respective pixels of an image. The control data 42 includes commands and parameters for controlling the driver chip 12. An application processor, a CPU (central processing unit), a DSP (digital signal processor), etc. may be used as the host.

The driving chip 12 performs a desired image data process on the received image data 41 to generate the grayscale voltages 32 for driving the display panel 11. The gray scale voltage corresponds to the gray scale value of the sub-pixel. The image data process performed in the driving chip 12 includes a sub-pixel rendering method. The image data process performed in the driver chip 12 may include processes other than the sub-pixel rendering process (e.g., color adjustment).

For example, the driver chip 12 includes an image processing unit, a first storage unit, and a second storage unit. The first storage unit is used for locally storing preset parameters of the display panel or receiving and storing configuration parameters of the display panel from a host. The second storage unit is used for storing rendering units of pixel units of different display panels and corresponding brightness rendering coefficients, such as corresponding lookup tables. The image processing unit can obtain the sub-pixel arrangement of the display panel according to preset parameters or configuration parameters, and obtain a rendering unit of the pixel unit and a corresponding brightness rendering coefficient according to the sub-pixel arrangement and the position of the pixel unit, wherein the rendering unit comprises an internal sub-pixel of the pixel unit and a plurality of compensation pixels adjacent to the pixel unit; and mapping the color component of each image pixel into the gray-scale value of the internal sub-pixel of the pixel unit and the gray-scale values of the plurality of compensation sub-pixels according to the brightness rendering coefficient.

The driving chip 12 supplies the scan signal 31 and the gray scale voltage 32 to the display panel 11. In the display panel 11, the scanning circuit 25 drives the scanning lines 21 from the scanning signal 31 received by the driver chip 12. In this embodiment, a pair of scanning circuits 25 is provided. One of the scan circuits 25 drives the odd-numbered scan lines 21 and the other drives the even-numbered scan lines 21. The driving chip 12 drives the data lines 22 with the grayscale voltages 32.

The driving chip according to the embodiment of the invention can be formed into a universal driving chip and can be suitable for display panels with different sub-pixel arrangements, so that the design cost and the manufacturing cost can be reduced.

The embodiment of the invention also provides a display driving device, which comprises the driving chip.

Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the sub-pixel rendering method provided in the foregoing embodiments.

It is noted that the processor herein may be a single processor or may be a collection of processing elements, for example, a CPU or one or more integrated circuits configured to implement the above sub-pixel rendering method.

The computer-readable storage medium provided by the present embodiment stores a program capable of correspondingly implementing the sub-pixel rendering method provided by the above-described embodiment. In addition, the program stored in the computer readable storage medium and the specific steps of the processor executing the program can also be referred to the description of the specific execution part of the driving chip.

It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, a processor may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units configured to perform the functions described herein, or a combination thereof.

For a software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.

The embodiments in this specification are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (chips), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block or blocks.

It should be noted that, in this document, the contained terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.

Claims

1. A sub-pixel rendering method for driving a plurality of pixel units of a display panel, each pixel unit including a plurality of sub-pixels of different colors, the method comprising:

obtaining a sub-pixel arrangement of a display panel;

obtaining a rendering unit of the pixel unit and a brightness rendering coefficient and a scaling coefficient of the corresponding sub-pixel according to the arrangement of the sub-pixels and the position of the pixel unit;

mapping the color component of each image pixel to a gray-scale value of a corresponding color sub-pixel of a rendering unit of the pixel unit; and

adjusting the gray scale driving parameters of each image pixel according to the brightness rendering coefficient and the scaling coefficient to make the brightness of the corresponding color sub-pixel consistent with the gray scale value of the corresponding color sub-pixel,

the plurality of pixel units comprise a first pixel unit and a second pixel unit, the rendering unit of the first pixel unit comprises a sub-pixel of the first pixel unit, the rendering unit of the second pixel unit comprises a sub-pixel of the second pixel unit and a compensation sub-pixel of an adjacent pixel unit, and the compensation sub-pixel is used for compensating at least one color component of the second pixel unit.

2. The sub-pixel rendering method of claim 1, wherein the sub-pixel arrangement of the display panel is a periodic structure repeating 1 blue sub-pixel, 2 green sub-pixels arranged in a column direction, and 2 red sub-pixels arranged in a column direction in a row direction, and the sub-pixel density of the display panel includes 2 red sub-pixels, 2 green sub-pixels, and 1 blue sub-pixel per 2 pixel units.

3. The sub-pixel rendering method of claim 2, wherein the green sub-pixel and the red sub-pixel have the same density and are half of the density of the blue sub-pixel, wherein the density of sub-pixels is related to light emitting luminance.

4. The sub-pixel rendering method of claim 2, wherein the first pixel unit includes 1 blue sub-pixel, 1 green sub-pixel, 1 red sub-pixel adjacent to each other, the second pixel unit includes 1 green sub-pixel, 1 red sub-pixel adjacent to each other, and the rendering unit of the second pixel unit obtains 1 blue sub-pixel from the adjacent first pixel unit as the compensation sub-pixel.

5. The sub-pixel rendering method according to claim 4, wherein the rendering unit of each of the first pixel unit and the second pixel unit obtains a luminance rendering coefficient of each sub-pixel according to the following formula:

BR:BG:BB＝x:x:1/2*x(1),

6. The subpixel rendering method of claim 5, wherein the scaling factor x is the ratio of the grayscale drive current maximum to the system drive current maximum, and 1/2 ≦ x ≦ 1.

7. The sub-pixel rendering method of claim 1, wherein the sub-pixel arrangement of the display panel is a periodic structure repeating 1 red sub-pixel, 2 green sub-pixels arranged in a column direction, and 2 blue sub-pixels arranged in a column direction in a row direction, and the sub-pixel density of the display panel includes 1 red sub-pixel, 2 green sub-pixels, and 2 blue sub-pixels per 2 pixel units.

8. The sub-pixel rendering method of claim 7, wherein the green sub-pixel and the blue sub-pixel have the same density and are half of the density of the red sub-pixel, wherein the density of sub-pixels is related to light emitting luminance.

9. The sub-pixel rendering method of claim 7, wherein the first pixel unit includes 1 red sub-pixel, 1 green sub-pixel, 1 blue sub-pixel adjacent to each other, the second pixel unit includes 1 green sub-pixel, 1 blue sub-pixel adjacent to each other, and the rendering unit of the second pixel unit obtains 1 red sub-pixel from the adjacent first pixel unit as the compensation sub-pixel.

10. The sub-pixel rendering method according to claim 9, wherein the first pixel unit and the second pixel unit obtain the luminance rendering coefficient of each sub-pixel by their respective rendering units according to the following formula:

BR:BG:BB＝1/2*x:x:x(3),

11. The subpixel rendering method of claim 10, wherein the scaling factor x is the ratio of the grayscale drive current maximum to the system drive current maximum, and 1/2 ≦ x ≦ 1.

12. The sub-pixel rendering method of claim 1, wherein the sub-pixel arrangement of the display panel is a periodic structure repeating 1 blue sub-pixel, 1 red sub-pixel and 1 green sub-pixel arranged in a column direction in a row direction, and the sub-pixel density of the display panel includes 5 red sub-pixels, 5 green sub-pixels and 5 blue sub-pixels per 6 pixel units.

13. The sub-pixel rendering method of claim 12, wherein the red sub-pixel, the green sub-pixel, and the blue sub-pixel are equal in density, wherein the density of sub-pixels is related to light emission luminance.

14. The sub-pixel rendering method of claim 12, wherein the plurality of pixel units further includes third through sixth pixel units, respective rendering units of the third through sixth pixel units include respective sub-pixels and compensation sub-pixels of adjacent pixel units,

15. The sub-pixel rendering method of claim 14, wherein the first pixel unit obtains the luminance rendering coefficient of each sub-pixel according to the following formula:

BR:BG:BB＝5/6*x:5/6*x:5/6*x(5),

16. The sub-pixel rendering method according to claim 14, wherein the second to sixth pixel units respectively obtain the luminance rendering coefficients of the respective sub-pixels according to the following formulas:

BR:BG:BB＝5/6*x:5/6*x:5/12*x(6),

17. A method of subpixel rendering as claimed in claim 15 or 16, wherein the scaling factor x is the ratio of the maximum value of grayscale drive current to the maximum value of system drive current, and 1/10 ≦ x ≦ 1.

18. A driving chip applied to a display panel includes:

obtaining a sub-pixel arrangement mode of the display panel;

obtaining a rendering unit of the pixel unit and a corresponding brightness rendering coefficient and a corresponding scaling coefficient according to the arrangement of the sub-pixels and the positions of the pixel units;

the plurality of pixel units comprise a first pixel unit and a second pixel unit, the rendering unit of the first pixel unit comprises a sub-pixel of the first pixel unit, the rendering unit of the second pixel unit comprises a sub-pixel of the second pixel unit and a compensation sub-pixel of the adjacent first pixel unit, and the compensation sub-pixel is used for compensating at least one color component of the second pixel unit.

19. The driver chip of claim 18, wherein the driving parameter includes at least one of a driving current, a driving voltage, and a duty ratio corresponding to a gray scale signal.

20. The driving chip of claim 18, wherein the display panel is one of a liquid crystal display panel and an organic light emitting diode display panel.

21. A computer-readable storage medium, on which a computer program is stored, wherein the computer program, when being executed by a processor, realizes the steps of the sub-pixel rendering method according to any one of claims 1 to 17.

22. A display device comprising the driver chip as claimed in any one of claims 18 to 20.