TWI627624B - Image data processing method and timing controller - Google Patents

Abstract

The invention provides a method for processing image data, comprising the steps of: performing gamma conversion on input image data according to gamma parameters, and determining first minimum brightness data of input image data; converting input image data from RGB color gamut to HSV color gamut And increasing the maximum brightness data of the converted input image data to a boundary value; determining a second minimum brightness data according to the converted input image data, and determining a reference coefficient according to the second minimum brightness data; according to the first minimum brightness data And the reference coefficient determines the output of the red brightness data, the output of the green brightness data, and the output of the blue brightness data, and determines the output white brightness data according to the first minimum brightness data. In addition, a timing controller has also been proposed.

Description

Image data processing method and timing controller

The present invention relates to a data processing technique, and in particular to an image data processing method and a timing controller.

With the advancement 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 the liquid crystal display, a white sub-pixel (W) is added to the RGB display panel (Red-Green-Blue) of the conventional display to increase the transmittance of the display panel. However, if the RGBW display panel (Red-Green-Blue-White) is driven by the input image data in the RGB format, the red pixel (R), the green pixel (G), and the blue pixel (B) in the RGBW display panel are caused. The brightness is dark. Moreover, the gamma parameter of each color display result of the RGBW display panel is shifted, which leads to 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, so that the color display effect of the RGBW display panel can be close to the color display effect of the conventional RGB display panel, is an important subject at present.

The invention provides an image data processing method and a timing controller, which can convert an input image data having RGB pixel data to generate output image data having RGBW pixel data, and can effectively drive the RGBW display panel by outputting the image data.

The image data processing method of the present invention comprises the steps of: performing gamma conversion on the input image data according to the gamma parameter, and determining the first minimum brightness data of the input image data; converting the input image data from the RGB color gamut to the HSV color gamut, And increasing the maximum brightness data of the converted input image data to a boundary value; determining a second minimum brightness data according to the converted input image data, and determining a reference coefficient according to the second minimum brightness data; and according to the first minimum brightness data And the reference coefficient determines the output of the red brightness data, the output of the green brightness data, and the output of the blue brightness data, and determines the output white brightness data according to the first minimum brightness data.

In an embodiment of the present invention, the image data processing method further includes the steps of: performing gamma conversion on the input red pixel data, the input green pixel data, and the input blue pixel data according to the gamma parameter; Generate input red brightness data, input green brightness data, and input blue brightness data.

In an embodiment of the invention, the gamma parameter is 2.2.

In an embodiment of the invention, the step of determining the first minimum brightness data of the input image data comprises: inputting the input image data into the red brightness data, inputting the green brightness data, and inputting the blue brightness data via gamma conversion, and Determine the input of the red brightness data, input the green brightness data, and input the size of the blue brightness data to determine the first minimum brightness data.

In an embodiment of the invention, the step of determining the second minimum brightness data according to the converted input image data comprises: converting the maximum hue data, the maximum saturation data, and the maximum brightness data of the converted input image data by the HSV color. The field is converted to the RGB color gamut to obtain the corresponding maximum red pixel data, the largest green pixel data, and the largest blue pixel data; and the maximum red pixel data, the largest green pixel data, and the maximum blue pixel data size are determined to obtain the minimum Pixel data, and the minimum pixel data is converted to a second minimum brightness data via gamma conversion.

In an embodiment of the invention, the determining, according to the first minimum brightness data and the reference coefficient, outputting the red brightness data, outputting the green brightness data, and outputting the blue brightness data, and determining the output white brightness data according to the first minimum brightness data. The step further comprises: performing gamma inverse conversion on the output red luminance data, the output green luminance data, the output blue luminance data, and the output white luminance data according to the gamma parameter to generate the output red pixel data, output the green pixel data, and output the blue color. Pixel data and output white pixel data.

The timing controller of the present invention is adapted to convert input image data to generate output image data to a driving circuit, and drive the display panel by the driving circuit. Timing controller color conversion module. The color conversion module includes a gamma conversion module, a color gamut conversion module, and a processing module. The gamma conversion module is configured to perform gamma conversion on the input image data according to the gamma parameter. The color gamut conversion module is configured to perform color gamut conversion between the RGB color gamut and the HSV color gamut on the input image data. The processing module is configured to increase the maximum brightness data of the converted input image data to a boundary value. The processing module determines the second minimum brightness data according to the converted input image data, and determines the reference coefficient according to the second minimum brightness data. The processing module determines the output red luminance data, the output green luminance data, and the output blue luminance data according to the first minimum luminance data and the reference coefficient, and determines the output white luminance data according to the first minimum luminance data.

In an embodiment of the invention, the gamma conversion module converts the input red pixel data, the input green pixel data, and the input blue pixel data of the input image data into the input red brightness data according to the gamma parameter, and inputs the green brightness. Data and input blue brightness data.

In an embodiment of the invention, the gamma parameter is 2.2.

In an embodiment of the invention, the gamma conversion module obtains input red luminance data, inputs green luminance data, and inputs blue luminance data by gamma conversion, and the processing module determines the input red luminance data. Enter the green brightness data and the size of the blue brightness data to determine the first minimum brightness data.

In an embodiment of the invention, the color gamut conversion module converts the maximum hue data, the maximum saturation data, and the maximum brightness data of the converted input image data from the HSV color gamut to the RGB color gamut, so that the processing mode is The group obtains the corresponding maximum red pixel data, maximum green pixel data, and maximum blue pixel data. The processing module determines the maximum red pixel data, the maximum green pixel data, and the maximum blue pixel data size to determine the minimum pixel data, and the gamma conversion module converts the minimum pixel data into the second minimum brightness data via gamma conversion.

In an embodiment of the invention, the gamma conversion module performs gamma inverse conversion on the output red luminance data, the output green luminance data, the output blue luminance data, and the output white luminance data according to the gamma parameter to generate an output. Red pixel data, output green pixel data, output blue pixel data, and output white pixel data.

Based on the above, the image data processing method and the timing controller of the present invention can convert the input image data to the HSV color gamut via the RGB color gamut, and adjust the maximum brightness value of the converted input image data to the maximum boundary value, and then The adjusted input image data is used to perform an operation to generate output image data, wherein the output image data includes outputting red pixel data, outputting green pixel data, outputting blue pixel data, and outputting white pixel data. That is to say, the image data processing method and the timing controller of the present invention can process and calculate the image data of the RGB color gamut to generate output image data that can effectively drive the RGBW display panel.

The above described features and advantages of the invention will be apparent from the following description.

The following examples are presented to illustrate the invention, but the invention is not limited to the illustrated embodiments. Further combinations are also allowed between the embodiments.

1 is a schematic diagram of a timing controller in accordance with an embodiment of the present 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 by the driving circuit 200. The drive circuit 200 may include, for example, a source drive circuit and a gate drive circuit or the like. In this embodiment, the timing controller 100 includes a color conversion module 110, and the color conversion module 110 can include a processing module 111, a gamma conversion module 112, and a color gamut conversion module 113. In this embodiment, the display panel 300 can be an RGBW display panel (Red-Green) disposed in a display such as a liquid crystal display (LCD) or an Organic Light Emitting Diode (OLED). -Blue-White). Also, the display panel 300 may include four types of pixels, among which are a red pixel (R), a green pixel (G), a blue pixel (B), and a white pixel (W). In the present embodiment, the timing controller 100 can have a processor and a storage device. The storage device can be a Dynamic Random Access Memory (DRAM). The storage device can store a plurality of modules, and at least the processing module 111, the gamma conversion module 112, and the color gamut conversion module 113 of the color conversion module 110 can be included. Moreover, the processor can be used to execute the modules in the color conversion module 110 to implement the image data processing method according to various embodiments of the present invention. However, in an embodiment, the processing module 111, the gamma conversion module 112, and the color gamut conversion module 113 of the color conversion module 110 can also be implemented in a hardware form, which is not limited by the present invention.

In this embodiment, the timing controller 100 can be configured to receive the input image data I1 having the red pixel data, the green pixel data, and the blue pixel data, and convert and calculate the input image data to generate the red pixel data. The green pixel data, the blue pixel data, and the output image data I2 of the white pixel data are used to drive the display panel 300. In other words, the timing controller 100 can correspondingly generate the output image data I2 in the RGBW format according to the input image data I1 in the RGB format.

2 is a flow chart of a method of processing image data in accordance with an embodiment of the present invention. Referring to FIGS. 1 and 2, the image data processing method of the present embodiment can be applied at least to the timing controller 100 of FIG. The image data processing method may include the following steps. First, in step S310, the gamma conversion module 112 may perform a gamma transform on the input image data I1 according to the gamma parameter, and determine a first minimum brightness data of the input image data. In the present embodiment, the gamma conversion module 112 can perform gamma conversion according to the following formulas (1) to (3). ………………(1) ………………(2) ..................(3)

In this embodiment, the symbol R is the input red pixel data, the symbol G is the input green pixel data, the symbol B is the input blue pixel data, the symbol RL is the input red luminance data, the symbol GL is the input green luminance data, the symbol is the input green luminance data, the symbol BL is the input blue luminance data, and the symbol Gamma is the gamma parameter. Specifically, the gamma conversion module 112 of the embodiment may perform gamma conversion on the input red pixel data R, the input green pixel data G, and the input blue pixel data B of the input image data I1 according to the gamma parameter Gamma. An input red luminance data RL, an input green luminance data GL, and an input blue luminance data BL are generated. That is, the gamma conversion module 112 can convert the red, green, and blue pixel data in the input image data I1 via gamma to generate corresponding red, green, and blue luminance data.

It is to be noted that the above gamma parameter Gamma can be set to 2.2, but the present invention is not limited thereto. In an embodiment, the gamma parameter Gamma may also be determined according to different panel specifications or user requirements.

In this embodiment, the processing module 111 can select one of the minimum values as the first minimum brightness data according to the input red brightness data RL, the input green brightness data GL, and the input blue brightness data BL. In this embodiment, the processing module 111 can select according to the following formula (4). ..................(4)

In the embodiment, the above symbol mL is the first minimum brightness data. Specifically, the processing module 111 of the embodiment can obtain the input red luminance data RL, the input green luminance data GL, and the input blue luminance data BL by gamma conversion, and determine the input red luminance data RL and input. The green brightness data GL and the size of the blue brightness data BL are input to determine the first minimum brightness data mL.

Next, in step S320, the timing controller 100 can convert the input image data I1 from the RGB color gamut to the HSV color gamut (Hue, Saturation, Value) by the color gamut conversion module 113. In this embodiment, the color gamut conversion module 113 can perform conversion according to the following formula (5). ..................(5)

In this embodiment, the above symbol hMax is the maximum hue data, the symbol sMax is the maximum saturation data, and the symbol vMax is the maximum brightness data. In this embodiment, the processing module 111 can increase the maximum brightness data vMax to a boundary value. That is, the processing module 111 directly sets the maximum brightness data vMax to 1 (highest brightness). In this embodiment, the processing module 111 can perform brightness data adjustment according to the following formula (6). ..................(6)

Next, in step S330, the processing module 111 can determine the second minimum brightness data according to the converted input image data. Referring first to FIG. 3, FIG. 3 is a flow chart for calculating a second minimum brightness in accordance with an embodiment of the present invention. In step S331, the color gamut conversion module 113 can convert the maximum hue data hMax, the maximum saturation data sMax, and the maximum brightness data vMax of the converted input image data I1 from the HSV color gamut to the RGB color gamut to obtain corresponding Maximum red pixel data, maximum green pixel data, and maximum blue pixel data. In this embodiment, the color gamut conversion module 113 can perform conversion according to the following formula (7). ..................(7)

In this embodiment, the symbol rMax is the maximum red pixel data, the symbol gMax is the maximum green pixel data, and the symbol bMax is the maximum blue pixel data. Then, in step S332, the processing module 111 can determine the size of the maximum red pixel data rMax, the maximum green pixel data gMax, and the maximum blue pixel data bMax to obtain the small pixel data, and then pass the gamma conversion module 112. A gamma conversion is performed to convert the minimum pixel data into a second minimum luminance data. In this embodiment, the processing module 111 can perform an operation according to the following formula (8), and the gamma conversion module 112 can perform the conversion according to the following formula (9). ………………(8) ………………(9)

In this embodiment, the above symbol mLmax is the second minimum luminance data. Referring again to FIG. 2, in step S330, the processing module 111 can determine the reference coefficient according to the second minimum luminance data mLmax. In this embodiment, the processing module 111 can perform operations according to the following formula (10). ..................(10)

In the present embodiment, the above symbol k is a reference coefficient. Finally, in step S340, the processing module 111 can determine the output red luminance data, the output green luminance data, and the output blue luminance data according to the first minimum luminance data mL and the reference coefficient k, and determine the output according to the first minimum luminance data mL. White brightness data. In this embodiment, the processing module 111 can perform operations according to the following formulas (11) to (14). ..................(11) ..................(12) ..................(13) ..................(14)

In this embodiment, the symbol RLp is output red luminance data, GLp is output green luminance data, BLp is output blue luminance data, and WLp is output white luminance data. In other words, the processing module 111 of the embodiment can adjust the input red luminance data RL, the input green luminance data GL, and the input of the original input image data I1 according to the calculated first minimum luminance data mL and the reference coefficient k. The blue luminance data BL is generated to generate an output red luminance data RLp, an output green luminance data GLp, and an output blue luminance data BLp. Moreover, the processing module 111 directly uses the first minimum brightness data mL calculated as the output white brightness data WLp.

In this embodiment, the gamma conversion module 112 performs gamma inverse conversion on the output red luminance data RLp, the output green luminance data GLp, the output blue luminance data BLp, and the output white luminance data WLp according to the gamma parameter. To generate output red pixel data, output green pixel data, output blue pixel data, and output white pixel data. In this embodiment, the gamma conversion module 112 can perform conversion according to the following formulas (15) to (18). ..................(15) ..................(16) ..................(17) ..................(18)

In this embodiment, the symbol Rp is the output red pixel data, the symbol Gp is the output green pixel data, the symbol Bp is the output blue pixel data, and the symbol Wp is the output white pixel data. In this embodiment, the timing controller 100 can generate the output image data I2 according to the calculated red pixel data Rp, the output green pixel data Gp, the output blue pixel data Bp, and the output white pixel data Wp. The display panel 300 is driven by the output image data I2. Therefore, the red pixel, the green pixel, the blue pixel, and the white pixel among the RGBW display panel 300 of the present embodiment can be effectively driven according to the output image data I2.

In summary, the image data processing method and the timing controller of the present invention can convert the input image data to the HSV color gamut via the RGB color gamut to obtain the first minimum luminance data. Moreover, the image data processing method and the timing controller of the present invention can adjust the maximum brightness value of the converted input image data to a boundary value (highest brightness), and then calculate the reference coefficient according to the adjusted input image data. Finally, the image data processing method and the timing controller of the present invention can adjust the brightness of each color of the original input according to the first minimum brightness data and the reference coefficient, and generate white brightness data, thereby generating pixels having red, green, blue, and white colors. Output image data of the data. Accordingly, the image data processing method of the present invention and the output image data generated by the timing controller can effectively drive the RGBW display panel, and the RGBW display panel can provide good display quality.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧ timing controller

110‧‧‧Color Conversion Module

111‧‧‧Processing module

112‧‧‧Gamma conversion module

113‧‧‧Color Gamut Conversion Module

200‧‧‧ drive circuit

300‧‧‧ display panel

I1‧‧‧ Input image data

I2‧‧‧ output image data

S410, S420, S430, S431, S432, S440‧‧ steps

1 is a schematic diagram of a timing controller in accordance with an embodiment of the present invention. 2 is a flow chart of a method of processing image data in accordance with an embodiment of the present invention. 3 is a flow chart for calculating a second minimum brightness in accordance with an embodiment of the present invention.

Claims (12)

An image data processing method includes: performing gamma conversion on an input image data according to a gamma parameter, and determining a first minimum brightness data of the input image data; converting the input image data from an RGB color gamut to a The HSV color gamut, and the maximum brightness data of the converted input image data is raised to a boundary value; determining a second minimum brightness data according to the converted input image data, and determining according to the second minimum brightness data a reference coefficient; determining an output red luminance data, an output green luminance data, and an output blue luminance data according to the first minimum luminance data and the reference coefficient, and determining an output white luminance data according to the first minimum luminance data. The image data processing method of claim 1, further comprising: performing gamma on an input red pixel data, an input green pixel data, and an input blue pixel data of the input image data according to the gamma parameter; Convert to generate an input red luminance data, an input green luminance data, and an input blue luminance data. The image data processing method according to claim 1, wherein the gamma parameter is 2.2. The method for processing the image data according to claim 1, wherein the step of determining the first minimum brightness data of the input image data comprises: obtaining an input red brightness data by gamma conversion of the input image data, An input of the green brightness data and an input blue brightness data, and determining the input red brightness data, the input green brightness data, and the size of the input blue brightness data to determine the first minimum brightness data. The image data processing method of claim 1, wherein the step of determining the second minimum brightness data according to the converted input image data comprises: converting a maximum color data of the input image data, The maximum saturation data and the maximum brightness data are converted by the HSV color gamut to the RGB color gamut to obtain a corresponding maximum red pixel data, a maximum green pixel data, and a maximum blue pixel data; and determining the maximum red pixel The data, the maximum green pixel data, and the size of the maximum blue pixel data are used to obtain a minimum pixel data, and the minimum pixel data is converted into the second minimum luminance data via the gamma conversion. The image data processing method of claim 1, wherein the output red luminance data, the output green luminance data, and the output blue luminance data are determined according to the first minimum luminance data and the reference coefficient, and according to the The step of determining the output white brightness data by the first minimum brightness data further comprises: performing a gamma on the output red brightness data, the output green brightness data, the output blue brightness data, and the output white brightness data according to the gamma parameter Inverse conversion to generate an output red pixel data, an output green pixel data, an output blue pixel data, and an output white pixel data. A timing controller is configured to convert an input image data to generate an output image data to a driving circuit, and drive a display panel by the driving circuit, comprising: a color conversion module, including: a gamma a conversion module for performing gamma conversion on an input image data according to a gamma parameter; a color gamut conversion module configured to perform a color gamut conversion between the RGB color gamut and an HSV color gamut for the input image data And a processing module for determining a first minimum brightness data of the input image data, and increasing a maximum brightness data of the converted input image data to a boundary value, wherein the processing module is converted according to the conversion The input image data determines a second minimum brightness data, and determines a reference coefficient according to the second minimum brightness data, wherein the processing module determines an output red brightness data according to the first minimum brightness data and the reference coefficient, An output green brightness data and an output blue brightness data, and an output white is determined according to the first minimum brightness data Degree information. The timing controller of claim 7, wherein the gamma conversion module inputs an input red pixel data, an input green pixel data, and an input blue pixel data of the input image data according to the gamma parameter. Convert to an input red brightness data, an input green brightness data, and an input blue brightness data. The timing controller of claim 7, wherein the gamma parameter is 2.2. The timing controller of claim 7, wherein the gamma conversion module obtains an input red luminance data, an input green luminance data, and an input blue luminance data by using a gamma conversion And the processing module determines the input red luminance data, the input green luminance data, and the size of the input blue luminance data to determine the first minimum luminance data. The timing controller of claim 7, wherein the color gamut conversion module converts a maximum hue data, a maximum saturation data, and the maximum brightness data of the converted input image data from the HSV color gamut Converting to the RGB color gamut, so that the processing module obtains a corresponding maximum red pixel data, a maximum green pixel data, and a maximum blue pixel data, wherein the processing module determines the maximum red pixel data, the maximum green color The pixel data and the size of the maximum blue pixel data are used to determine a minimum pixel data, and the gamma conversion module converts the minimum pixel data into the second minimum brightness data via the gamma conversion. The timing controller of claim 7, wherein the gamma conversion module outputs the red luminance data, the output green luminance data, the output blue luminance data, and the output white luminance according to the gamma parameter. The data performs a gamma inverse conversion to generate an output red pixel data, an output green pixel data, an output blue pixel data, and an output white pixel data.