CN109427315B

CN109427315B - Image data processing method and time schedule controller

Info

Publication number: CN109427315B
Application number: CN201710717332.5A
Authority: CN
Inventors: 叶盈翰
Original assignee: Himax Technologies Ltd
Current assignee: Himax Technologies Ltd
Priority date: 2017-08-21
Filing date: 2017-08-21
Publication date: 2020-10-02
Anticipated expiration: 2037-08-21
Also published as: CN109427315A

Abstract

The invention provides an image data processing method suitable for an RGBW display panel and a time sequence controller. The image data processing method comprises the following steps: converting the input image data from an RGB color gamut to an HSV color gamut, and acquiring a plurality of hue data, a plurality of saturation data and a plurality of brightness data of the input image data; determining a plurality of data tables corresponding to a plurality of colors of the RGBW display panel; obtaining a plurality of maximum pixel values corresponding to a plurality of colors from the data tables according to the hue data and the saturation data; a plurality of output pixel data are determined according to the respective maximum pixel values of the colors and the corresponding brightness data, and output image data are generated according to the output pixel data. The image data processing method of the invention can convert the input image data with RGB pixel data by the time schedule controller to generate the output image data with RGBW pixel data.

Description

Image data processing method and time schedule controller

Technical Field

The present invention relates to data processing technologies, and more particularly, to an image data processing method and a timing controller.

Background

With the progress of technology, Liquid Crystal Displays (LCDs) and Organic Light Emitting Diodes (OLEDs) have been widely used in various Display devices such as mobile phones, tablet computers, and televisions. In general, in order to more effectively utilize the backlight brightness of a liquid crystal display (lcd) or an organic light emitting diode (oled) display, a white subpixel (W) is added to an RGB display panel (Red-Green-Blue) of a conventional display to increase the transmittance of the display panel. However, the White spectrum of the RGBW display panel is often not equal to the sum of the Red spectrum, the Green spectrum and the Blue spectrum, and if the RGBW display panel (Red-Green-Blue-White) is not driven by the precisely corrected pixel data, the color temperature of the RGBW display panel may shift, which causes the White color temperature of the RGBW display panel to be different from the White color temperature formed by only using three colors of Red, Green and Blue, thereby causing poor display effect or color distortion of the RGBW display panel. Therefore, how to effectively drive the RGBW display panel according to the RGB input image data and make the RGBW display panel exhibit the display effect with the normal color temperature is an important issue at present.

Disclosure of Invention

The invention provides an image data processing method, and a time schedule controller can convert input image data with RGB pixel data to generate output image data with RGBW pixel data, and can effectively drive an RGBW display panel through the output image data, so that the RGBW display panel can present display effect with expected color temperature.

The image data processing method is suitable for RGBW display panels. The image data processing method comprises the following steps: converting the input image data from an RGB color gamut to an HSV color gamut, and acquiring a plurality of hue data, a plurality of saturation data and a plurality of brightness data of the input image data; determining a plurality of data tables corresponding to a plurality of colors of the RGBW display panel; obtaining a plurality of maximum pixel values corresponding to a plurality of colors from the data tables according to the hue data and the saturation data; and determining a plurality of output pixel data according to the respective maximum pixel values of the colors and the corresponding brightness data, and generating output image data according to the output pixel data.

In an embodiment of the invention, the step of determining the plurality of output pixel data according to the maximum pixel values of the colors and the corresponding luminance data includes: the respective maximum pixel values of the colors are multiplied by the corresponding luminance data to obtain the output pixel data.

In an embodiment of the invention, the image data processing method further includes the following steps: the RGBW display panel is driven by outputting the image data, and has a gamma value of 2.2.

In an embodiment of the invention, a white color temperature of the RGBW display panel driven by the output image data is equal to a color temperature obtained by simply mixing red, green and blue colors of the RGBW display panel.

In an embodiment of the invention, the colors include at least one of red, green, blue and white.

In an embodiment of the invention, the output pixel data includes at least one of red output pixel data, green output pixel data, blue output pixel data and white output pixel data.

The time schedule controller is suitable for driving the RGBW display panel through a driving circuit. The time schedule controller comprises a color conversion module. The color conversion module comprises a color gamut conversion module, a table look-up module and a processing module. The color gamut conversion module is used for converting the input image data from an RGB color gamut to an HSV color gamut and obtaining a plurality of hue data, a plurality of saturation data and a plurality of brightness data of the input image data. The table look-up module is used for determining a plurality of data tables corresponding to a plurality of colors of the RGBW display panel. The look-up table module is used for respectively obtaining a plurality of maximum pixel values corresponding to a plurality of colors from the data tables according to the hue data and the saturation data. The processing module is used for determining a plurality of output pixel data according to the respective maximum pixel values of the colors and the corresponding brightness data, and generating output image data according to the output pixel data.

In an embodiment of the invention, the output pixel data is equal to respective maximum pixel values of the colors multiplied by the corresponding luminance data.

In an embodiment of the invention, the processing module drives the RGBW display panel by outputting the image data, and a gamma value of the RGBW display panel is 2.2.

In an embodiment of the invention, the processing module drives the RGBW display panel by outputting the image data, and a white color temperature of the RGBW display panel is equal to a color temperature obtained by simply mixing red, green and blue of the RGBW display panel.

Based on the above, the image data processing method of the present invention can convert the input image data with RGB pixel data by the timing controller to generate the output image data with RGBW pixel data, and can make the display panel show the display effect with the desired color temperature after being driven by the output image data.

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 timing controller according to an embodiment of the invention.

Fig. 2 is a flowchart illustrating an image data processing method according to an embodiment of the invention.

FIG. 3 is a diagram of a red pixel data model according to an embodiment of the invention.

FIG. 4 is a diagram of a green pixel data model according to an embodiment of the invention.

FIG. 5 is a diagram of a blue pixel data model according to an embodiment of the invention.

FIG. 6 is a diagram of a white pixel data model according to an embodiment of the invention.

Description of reference numerals:

100: time sequence controller

110: color conversion module

111: processing module

112: color gamut conversion module

113: table look-up module

200: driving circuit

300: display panel

I1: inputting image data

I2: outputting image data

S410, S420, S430, S440: step (ii) of

Detailed Description

A number of embodiments are presented below to illustrate the invention, however the invention is not limited to the illustrated embodiments. Suitable combinations between the embodiments are also allowed.

Fig. 1 is a schematic diagram of a timing controller according to an embodiment of the invention. Referring to fig. 1, the timing controller 100 is coupled to the driving circuit 200, and the driving circuit 200 is coupled to the display panel 300. In the present embodiment, the timing controller 100 drives the display panel 300 through the driving circuit 200. The driving circuit 200 may include a source driving circuit, a gate driving circuit, and the like. The timing controller 100 includes a color conversion module 110, and the color conversion module 110 may include a processing module 111, a color gamut conversion module 112, and a table lookup module 113. In the present embodiment, the Display panel 300 may be an RGBW Display panel (Red-Green-Blue-White) configured in a Liquid Crystal Display (LCD), an Organic Light Emitting Diode (OLED) Display, or the like. Also, the display panel 300 may include four pixels, which are a red pixel (R), a green pixel (G), a blue pixel (B), and a white pixel (W), respectively. In the present embodiment, the timing controller 100 may have a processor and a storage device. The storage device may be a Dynamic Random Access Memory (DRAM). The storage device can store a plurality of modules, which may include at least a processing module 111 of the color conversion module 110, a color gamut conversion module 112, and a look-up table module 113. Moreover, the processor can be used to execute these modules in the color conversion module 110 to implement the image data processing method according to the embodiments of the present invention. However, in an embodiment, the processing module 111, the color gamut converting module 112, and the look-up table module 113 of the color converting module 110 may also be implemented in a hardware form, and the invention is not limited thereto.

In the present embodiment, the timing controller 100 is configured to receive input image data I1 having input red pixel data, input green pixel data, and input blue pixel data, convert and operate the input image data to generate output image data I2 having output red pixel data, output green pixel data, output blue pixel data, and output white pixel data, and is configured to drive the display panel 300. In other words, the timing controller 100 may correspondingly generate the output image data I2 in the RGBW format (Red-Green-Blue-White) according to the input image data I1 in the RGB format (Red-Green-Blue).

Fig. 2 is a flowchart illustrating an image data processing method according to an embodiment of the invention. Referring to fig. 1 and 2, the image data processing method of the present embodiment is at least applicable to the timing controller 100 of fig. 1. The color conversion module 110 of the timing controller 100 includes a processing module 111, a color gamut conversion module 112, and a table lookup module 113. The image data processing method may include the following steps. First, in step S410, the color gamut conversion module 112 is configured to convert the input image data I1 from RGB color (Red-Green-Blue) to HSV color (Hue-Saturation-Value) and obtain a plurality of Hue data, a plurality of Saturation data and a plurality of luminance data of the input image data I1. The color gamut conversion module 112 may perform color gamut conversion according to the following formula (1).

[h,s,v]＝rgb2hsv(R,G,B)………………(1)

The above-mentioned symbol h is hue data, symbol s is saturation data, symbol v is brightness data, symbol R is input red pixel data, symbol G is input green pixel data, and symbol B is input blue pixel data. That is, in the present embodiment, the color gamut conversion module 112 may convert the input image data I1 in the RGB color gamut format into the HSV color gamut format, and obtain a plurality of hue data, a plurality of saturation data and a plurality of luminance data corresponding to a plurality of color pixels.

Next, in step S420, the processing module 111 may determine a plurality of data tables corresponding to a plurality of colors of the display panel 300, wherein the data tables are Look-Up tables (LUTs). In the present embodiment, the data tables can be used to represent gray level for each hue data and each saturation data, and the data tables can be determined according to the panel characteristics of the display panel 300. For example, the display panel 300 may receive red, green and blue image data to present corresponding display images, so that the gray scale intensity of each color corresponding to each hue data and each saturation data in the data tables may be determined according to the display result of each color in the display images.

FIG. 3 is a diagram of a red pixel data model according to an embodiment of the invention. Referring to FIG. 3, the data table may be taken from the HSV data model shown in FIG. 3. In the present embodiment, the corresponding gray-scale intensity can be obtained according to the corresponding hue data and saturation data in the red pixel data table.

FIG. 4 is a diagram of a green pixel data model according to an embodiment of the invention. Referring to FIG. 4, the data table may be taken from the HSV data model shown in FIG. 4. In the present embodiment, the corresponding gray-scale intensity can be obtained according to the corresponding hue data and saturation data in the green pixel data table.

FIG. 5 is a diagram of a blue pixel data model according to an embodiment of the invention. Referring to FIG. 5, the data table may be taken from the HSV data model shown in FIG. 5. In the present embodiment, the corresponding gray-scale intensity can be obtained according to the corresponding hue data and saturation data in the blue pixel data table.

FIG. 6 is a diagram of a white pixel data model according to an embodiment of the invention. Referring to FIG. 6, the data table may be taken from the HSV data model shown in FIG. 6. In the present embodiment, the corresponding gray scale intensity can be obtained according to the corresponding hue data and saturation data in the white pixel data table.

It is noted that the pixel data models of fig. 3 to 6 can be established according to the color results outputted corresponding to the panel characteristics of the display panel 300 and according to the CIE 1931XYZ color space specification. For example, the timing controller 100 can sample the hue data and saturation data corresponding to 97 color pixels to establish the pixel data model shown in fig. 3 to 6, but the invention is not limited thereto. In one embodiment, the number of pixel data model samples may be determined according to panel specifications or manufacturer requirements. That is, the pixel data model of the present embodiment can be determined according to the chromaticity values (X, Y, Z) of each color in the CIE 1931XYZ color space and the corresponding hue data and saturation data, so as to fill the data values and gray scale intensities of each color corresponding to the hue data and the saturation data into the pixel data models of fig. 3 to 6.

For example, if the color temperature of the darkest yellow (yellow) color presented by the display panel 300 is shifted to red, the maximum pixel value of each of the pixel data models of fig. 3 corresponding to the darkest yellow hue and having the maximum saturation can be adjusted, and so on, the data value of each of the pixel data models can be adjusted according to the shift result of the different colors of the display panel 300.

Referring to fig. 2 again, in step S430, the table look-up module 113 may obtain gray-scale intensities corresponding to maximum pixel values of a plurality of colors in the data tables according to the obtained hue data and saturation data. In this embodiment, the colors may include at least one of red, green, blue, and white. The table lookup module 113 may perform table lookup according to the following formulas (2) to (5).

R max＝Rtab(h,s)………………(2)

G max＝Gtab(h,s)………………(3)

B max＝Btab(h,s)………………(4)

W max＝Wtab(h,s)………………(5)

Wherein the symbol Rmax is a maximum red pixel value, the symbol Gmax is a maximum green pixel value, the symbol Bmax is a maximum blue pixel value, the symbol Wmax is a maximum white pixel value, the symbol Rtab (h, s) is a red pixel data table, the symbol Gtab (h, s) is a green pixel data table, the symbol Btab (h, s) is a blue pixel data table, and the symbol Wtab (h, s) is a white pixel data table. In this embodiment, the table look-up module 113 can obtain the corresponding red, green, blue and white maximum pixel values in each table according to the obtained hue data and saturation data.

Finally, in step S440, the processing module 111 determines a plurality of output pixel data according to the respective maximum pixel values of the colors and the corresponding luminance data, and generates output image data according to the output pixel data. The processing module 111 can perform operations according to the following equations (6) to (9).

Rp＝R max×v………………(6)

Gp＝G max×v………………(7)

Bp＝B max×v………………(8)

Wp＝W max×v………………(9)

The above-mentioned symbol Rp is output red pixel data, Gp is output green pixel data, Bp is output blue pixel data, Wp is output white pixel data Wp, and v is luminance data. In this embodiment, the processing module 111 multiplies the obtained maximum red pixel value Rmax, maximum green pixel value Gmax, maximum blue pixel value Bmax and maximum white pixel value Wmax by the corresponding luminance data to generate the output red pixel data Rp, the output green pixel data Gp, the output blue pixel data Bp and the output white pixel data Wp.

That is, the processing module 111 of the present embodiment can obtain the appropriate output red pixel data Rp, output green pixel data Gp, output blue pixel data Bp, and output white pixel data Wp by looking up the four data tables of fig. 3 to 6 through the input red pixel data R, the input green pixel data G, and the input blue pixel data B of the input video data I1, so that the gamma value (gamma) of the display panel 300 driven by the output video data I2 can be 2.2. In one embodiment, the color temperature of the white color of the display panel 300 is equal to the color temperature of a mixture of red, green and blue colors of a simple RGBW display panel.

In summary, the image data processing method of the present invention and the timing controller can convert the input image data with RGB pixel data to generate the output image data with RGBW pixel data. In the image data processing method of the present invention, the timing controller can obtain each output pixel data corresponding to the appropriate hue data and saturation data by looking up the data table, so that the gamma value of the RGBW display panel driven by the output image data can be 2.2, and the white color temperature of the RGBW display panel can be equal to the color temperature of the RGBW display panel simply using the mixture of red, green and blue colors of the RGBW display panel.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. An image data processing method is suitable for an RGBW display panel, wherein the image data processing method comprises the following steps:

converting an input image data from an RGB color gamut to an HSV color gamut, and obtaining a plurality of hue data, a plurality of saturation data and a plurality of brightness data of the input image data;

determining a plurality of data tables corresponding to a plurality of colors of the RGBW display panel;

obtaining a plurality of maximum pixel values corresponding to a plurality of colors in the data table according to the hue data and the saturation data; and

determining a plurality of output pixel data according to the respective maximum pixel values of the colors and the corresponding brightness data, and generating an output image data according to the output pixel data,

the data tables are respectively used for representing each hue data and the gray scale intensity corresponding to each saturation data, and are determined according to the panel characteristics of the RGBW display panel.

2. The method of claim 1, wherein determining a plurality of output pixel data according to the maximum pixel values of the colors and the corresponding luminance data comprises:

the respective maximum pixel values of the colors are multiplied by the corresponding luminance data to obtain the output pixel data.

3. The image data processing method of claim 1, further comprising:

the RGBW display panel is driven by the output image data, and has a gamma value of 2.2.

4. The method of claim 1, wherein a white color temperature of the RGBW display panel driven by the output image data is equal to a color temperature obtained by simply mixing red, green, and blue colors of the RGBW display panel.

5. The method of claim 1, wherein the color comprises at least one of red, green, blue, and white.

6. The method of claim 1, wherein the output pixel data comprises at least one of a red output pixel data, a green output pixel data, a blue output pixel data, and a white output pixel data.

7. A timing controller adapted to drive an RGBW display panel by a driving circuit, wherein the timing controller comprises:

a color conversion module comprising:

a color gamut conversion module, for converting an input image data from an RGB color gamut to an HSV color gamut, and obtaining a plurality of hue data, a plurality of saturation data and a plurality of brightness data of the input image data;

a look-up table module for determining a plurality of data tables corresponding to a plurality of colors of the RGBW display panel, and for obtaining a plurality of maximum pixel values corresponding to the plurality of colors from the data tables according to the hue data and the saturation data; and

a processing module for determining a plurality of output pixel data according to the respective maximum pixel values of the colors and the corresponding luminance data, and generating an output image data according to the output pixel data,

8. The timing controller of claim 7, wherein the output pixel data is equal to the respective maximum pixel values of the colors multiplied by the corresponding luminance data.

9. The timing controller as claimed in claim 7, wherein the processing module drives the RGBW display panel by the output image data, and the gamma value of the RGBW display panel is 2.2.

10. The timing controller of claim 7, wherein the processing module drives the RGBW display panel by the output image data, and a white color temperature of the RGBW display panel is equal to a color temperature obtained by simply mixing red, green and blue colors of the RGBW display panel.

11. The timing controller of claim 7, wherein the color comprises at least one of red, green, blue, and white.

12. The timing controller of claim 7, wherein the output pixel data comprises at least one of a red output pixel data, a green output pixel data, a blue output pixel data, and a white output pixel data.