TW201843672A - Brightness adjustment method and display - Google Patents

Abstract

The present invention provides a brightness adjustment method adapting to a display. A display panel of the display includes a plurality of pixels. The brightness adjustment method includes following steps: determining a maximum value for each of the pixels in a frame; counting a number of the plurality of grayscale values respectively corresponding to the maximum pixel values of the pixels to establish a gray scale value histogram; determining whether to generate an index value according to the gray scale value histogram; obtaining a pixel gain value corresponding to the index value corresponding to the index value according to a look up table; and adjusting each of the pixels in the picture according to the pixel gain value. In addition, a display is also provided.

Description

Brightness adjustment method and display

The present invention relates to a display technology, and more particularly to a brightness adjustment method, and a display to which the brightness adjustment method is applied.

With the advancement of technology, liquid crystal displays (LCDs) 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, a white sub-pixel (W) is added to a conventional RGB liquid crystal display (Red-Green-Blue) to increase the transmittance of the display panel. However, since the total number of red sub-pixels (R), green sub-pixels (G), and blue sub-pixels (B) of the RGBW display is about three-quarters of that of the RGB display, the red sub-pixels and green sub-pixels of the RGBW display are The overall number of pixels and blue subpixels will be less than the RGB display. That is, if the RGBW display is driven by the driving signal of the RGB display, the overall brightness of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the RGBW display may be lower than that of the RGB display. In this regard, how to effectively adjust the color brightness of RGBW displays is an important issue at present.

The present invention provides a brightness adjustment method and a display, wherein the display of the present invention and the brightness adjustment method thereof can determine whether it is necessary to adjust the picture by calculating the number of the plurality of target pixels in the picture corresponding to the plurality of gray scale values respectively. The pixel values of the respective target pixels, according to which the brightness adjusting method and the display panel of the present invention can provide good display results.

The brightness adjustment method of the present invention is applicable to a display, and the display panel of the display includes a plurality of pixels. The brightness adjustment method includes the following steps: determining a maximum pixel value of each of the plurality of pixels in a picture; and counting a number of gray level values respectively corresponding to the maximum pixel values of the plurality of pixels a grayscale value histogram is established; determining whether an index value is generated according to the grayscale value histogram; obtaining a pixel gain value corresponding to the index value according to the lookup table; and adjusting the screen according to the pixel gain value Each of the plurality of pixels in the middle.

In an embodiment of the invention, the plurality of pixels respectively include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and determine the maximum pixel value of each of the plurality of pixels in the picture. The step includes comparing the red sub-pixels, the green sub-pixels, and the blue sub-pixels of the plurality of pixels to determine the maximum pixel value of each of the plurality of pixels.

In an embodiment of the invention, the display panel is an RGBW display panel.

In an embodiment of the present invention, the step of determining whether to generate the index value according to the grayscale value histogram comprises: sequentially, from a maximum grayscale value of the grayscale value histogram to a minimum grayscale value The number corresponding to the different grayscale values is accumulated until the cumulative quantity value is greater than or equal to the critical quantity value, and the accumulation is stopped, and the last accumulated grayscale value is determined as the index value.

In an embodiment of the invention, the step of obtaining the pixel gain value corresponding to the index value according to the lookup table includes: obtaining a corresponding gain value according to the index value, and dividing the gain value The pixel gain value is obtained by a preset coefficient.

In an embodiment of the invention, the step of adjusting the plurality of pixels in the picture according to the pixel gain value comprises: by using the red sub-pixels of the plurality of pixels, the The pixel values of the green sub-pixel and the blue sub-pixel are respectively multiplied by the pixel gain value to adjust the plurality of pixels.

In an embodiment of the invention, the step of adjusting the plurality of pixels in the picture according to the pixel gain value includes: if the red sub-pixel, the green sub-pixel of the plurality of pixels, and The adjusted pixel value of at least one of the blue sub-pixels is greater than the maximum pixel value, and at least the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the plurality of pixels are One of them is set to the maximum pixel value.

The display of the present invention includes a timing controller, a source driver, and a display panel. The source driver is coupled to the timing controller. The display panel includes a plurality of pixels for displaying a picture. The timing controller is used to drive the display panel through the source driver. The timing controller includes a judgment module, a statistics module, an analysis module, a search module, and an adjustment module. The determining module is configured to determine a maximum pixel value of each of the plurality of pixels in the picture. The analysis module is configured to determine whether to generate an index value according to the gray scale value histogram. The lookup module is configured to obtain a pixel gain value corresponding to the index value according to the lookup table. The adjustment module is configured to adjust each of the plurality of pixels in the picture according to the pixel gain value.

In an embodiment of the invention, the plurality of pixels respectively include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the target pixel includes the first pixel, the second pixel, and the a third pixel, and the timing controller operates the determining module to compare the red sub-pixel, the green sub-pixel, and the blue sub-pixel of each of the plurality of pixels to determine each of the The maximum pixel value of a plurality of pixels.

In an embodiment of the invention, the display panel is an RGBW display panel.

In an embodiment of the present invention, the timing controller operates the analysis module to sequentially accumulate the number of different grayscale values from the maximum grayscale value of the grayscale value histogram to the minimum grayscale value. The accumulation is stopped until the cumulative quantity value is greater than or equal to the critical quantity value, and it is determined that the last accumulated gray scale value is the index value.

In an embodiment of the present invention, the timing controller operates the lookup module to obtain a corresponding gain value according to the index value, and divide the gain value by a preset coefficient to obtain the pixel gain value. .

In an embodiment of the invention, the timing controller operates the adjustment module by using the red sub-pixel, the green sub-pixel, and the blue sub-pixel of each of the plurality of pixels The pixel values are multiplied by the pixel gain values, respectively, to adjust the plurality of pixels.

In an embodiment of the invention, if the adjusted pixel value of at least one of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the plurality of pixels is greater than a maximum pixel value, The timing controller operates the adjustment module to set at least one of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the plurality of pixels to the maximum pixel value.

Based on the above, the brightness adjustment method and the display of the present invention can effectively determine the distribution of the maximum pixel value of each pixel in the picture, and further adjust each red sub-pixel, each green sub-pixel, and each blue in the display picture of the RGBW display panel. The brightness of the sub-pixels.

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 display in accordance with an embodiment of the present invention. Referring to FIG. 1 , the display 100 includes a timing controller 110 (Timing Controller, TCON), a source driver 120 (Source driver), and a display panel 130 . The timing controller 110 can include a plurality of modules, wherein the modules can be used for image processing. In this embodiment, the modules may include a determination module 111, a statistics module 112, an analysis module 113, a lookup module 114, and an adjustment module 115.

In this embodiment, the display 100 is a liquid crystal display (LCD). The timing controller 110 is coupled to the source driver 120 , and the source driver 120 is coupled to the display panel 130 . The timing controller 110 drives the display panel 130 through the source driver 120. In this embodiment, the timing controller 110 can execute the determination module 111, the statistics module 112, the analysis module 113, the search module 114, and the adjustment module 115 to implement image analysis according to various embodiments of the present invention. And adjustment methods, etc. In this embodiment, the determination module 111, the statistics module 112, the analysis module 113, the search module 114, and the adjustment module 115 can be implemented by a hardware circuit form, but the present invention is not limited thereto. In an embodiment, the modules may be stored in a storage device in a software format, so that the timing controller 110 can implement the image analysis and adjustment methods and the like according to various embodiments of the present invention.

In this embodiment, the display panel 130 can be an RGBW display panel (Red-Green-Blue-White). The display panel 130 may include a plurality of pixels, and each pixel includes four seed pixels, respectively, wherein the red sub-pixel (R), the green sub-pixel (G), the blue sub-pixel (B), and the white sub-pixel (W) ). In this regard, the display panel 130 of the present embodiment determines whether to adjust the red sub-pixel, the green sub-pixel, and the blue sub-pixel of each pixel according to the maximum pixel value of each pixel corresponding to the number of different gray-scale values. The pixel value (luminance value) of the pixel.

In the embodiment, when the display panel 130 displays an image, the timing controller 110 can execute the modules. In this embodiment, for one frame of the image, the determining module 111 can be used to determine the maximum pixel value of each of the plurality of pixels in the image. The determining module 111 can compare the red sub-pixels, the green sub-pixels and the blue sub-pixels of the pixels to determine the maximum pixel value of each pixel. For example, if a pixel has a red sub-pixel value, a green sub-pixel value, and a blue sub-pixel value of 125, 125, and 255, respectively, the determination module 111 determines that the maximum pixel value of the pixel is 255.

In this embodiment, the statistics module 112 can count the number of gray scale values corresponding to the maximum pixel values of the respective pixels to establish a gray scale histogram. Then, the analysis module 113 can sequentially accumulate the corresponding numbers of different grayscale values from the maximum grayscale value (255) of the grayscale value histogram to the minimum grayscale value (0) until the cumulative quantity value is greater than or equal to After the critical quantity value, the accumulation is stopped, and the last accumulated gray level value is determined as an index value. Moreover, the lookup module 114 can obtain a pixel gain value (Pixel Gain) corresponding to the index value according to a lookup table (LUT). Finally, the adjustment module 115 can adjust all the pixels of the display panel 130 according to the pixel gain value, so that the brightness of the screen displayed by the display panel 130 can be adjusted. Incidentally, each of the above modules can continuously adjust a plurality of consecutive images in the image for dynamic dimming operation.

2 is a gray scale value histogram in accordance with an embodiment of the present invention. Referring to FIG. 1 and FIG. 2, the statistical module 112 may classify the maximum pixel values of each pixel into corresponding grayscale values to establish a grayscale value histogram as shown in FIG. 2. In the present embodiment, the horizontal axis of the grayscale value histogram is a grayscale value of 0 to 255, and the vertical axis of the grayscale value histogram is the number. Therefore, a grayscale value histogram can be used to present the distribution of the maximum pixel value of each pixel in a picture. In addition, in this embodiment, the analysis module 113 can sequentially accumulate the number corresponding to different grayscale values from the maximum grayscale value (255) of the grayscale value histogram to the minimum grayscale value (0) until the cumulative quantity value After the greater than or equal to the critical quantity value t, the accumulation is stopped, and the last accumulated grayscale value is determined as an index value.

In this embodiment, the display 100 of the present embodiment can set the threshold value t according to user requirements or panel specifications. In this embodiment, the timing controller 110 can obtain a gain value (Gain) corresponding to the index value by executing a lookup table established by the lookup module 114. The lookup table can be, for example, as shown in Table 1 below. Table 1

For example, when the analysis module 113 determines that the last accumulated grayscale value is 240, the lookup module 114 obtains a gain value 273 corresponding to the index value 240 from the lookup table. Next, the search module 114 divides the gain value by a preset coefficient to obtain the pixel gain value (Pixel Gain). In the present embodiment, the preset coefficient may be 256, and the pixel gain value of this example is 273/256, but the present invention is not limited thereto. In an embodiment, the lookup table of Table 1 can be determined according to user requirements or panel characteristics, and the relationship between the gain value and the pixel gain value can be determined according to the following formula (1). ………………(1)

3 is a schematic diagram of adjusting grayscale values in accordance with an embodiment of the present invention. Referring to FIG. 1 and FIG. 3, the relationship between the input gray scale for driving the display panel 130 and the output gray scale displayed by the display panel 130 may be as shown by the line segment L1. According to the above description, when the search module 114 obtains the gain value corresponding to the index value 240 from the lookup table of Table 1, the timing controller 110 can obtain the pixel gain value of 273/256. Next, the timing controller 110 can execute the adjustment module 115 to multiply the respective pixel values of each pixel by 273/256. However, since the upper limit of the pixel value is 255, if the adjusted pixel value of at least one of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of a pixel is greater than the upper limit of the pixel value, the red sub-pixel of the pixel The pixel value of at least one of the pixel, the green sub-pixel, and the blue sub-pixel is directly set to 255. As another example, if the pixel value of this pixel is 240, multiplying by the pixel gain value of 273/256 is approximately equal to 255.9. In this regard, the adjustment module 115 will directly set this pixel value of this pixel to 255. Therefore, the relationship between the adjusted input grayscale value and the output grayscale value can be as shown by the line segment L2, and the overall color brightness in the screen displayed by the adjusted display panel 130 will be brightened.

FIG. 4 is a flow chart of a brightness adjustment method according to an embodiment of the invention. Referring to FIG. 1 and FIG. 4, the brightness adjustment method of the present embodiment can be applied to at least the display 100 of FIG. In the present embodiment, the display panel 130 of the display 100 may include a plurality of pixels. The brightness adjustment method of this embodiment may include the following steps. In step S410, the timing controller 110 may execute the determination module 111 and determine the respective maximum pixel values of the plurality of pixels in one screen. In step S420, the timing controller 110 may execute the statistical module 112, and count the number of grayscale values corresponding to the respective maximum pixel values of the pixels to establish a grayscale value histogram. In step S430, the timing controller 110 may execute the analysis module 113 and determine whether to generate an index value according to the grayscale value histogram. In step S440, the timing controller 110 may execute the lookup module 114 and obtain a pixel gain value corresponding to the index value according to the lookup table. In step S450, the timing controller 110 may perform the adjustment module 115 and adjust each of the pixels in the picture according to the pixel gain value. Accordingly, the brightness adjustment method of the embodiment can effectively adjust the brightness of each of the red sub-pixels, the green sub-pixels, and the respective blue sub-pixels in the display screen of the RGBW display panel.

In addition, the related device features, the image analysis method, and the image adjustment method of the brightness adjustment method of the present embodiment can be sufficiently taught, suggested, and implemented by the above-described embodiments of FIG. 1 to FIG. 3, and thus will not be described again.

In summary, the brightness adjustment method and the display of the present invention can effectively determine the degree of color shading of each of the red sub-pixels, the green sub-pixels, and the respective blue sub-pixels in the display panel, and further adjust the overall color brightness of the display panel. Moreover, the present invention can also sequentially adjust a plurality of different continuous pictures in the image to dynamically adjust the color brightness of the display panel. Accordingly, the brightness adjustment method and display of the present invention can provide a good display effect.

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‧‧‧ display

110‧‧‧Sequence Controller

111‧‧‧Judgement module

112‧‧‧Statistical Module

113‧‧‧Analysis module

114‧‧‧Search module

115‧‧‧Adjustment module

120‧‧‧Source Driver

130‧‧‧ display panel

T‧‧‧critical quantity

L1, L2‧‧‧ segments

S410, S420, S430, S440, S450‧‧ steps

1 is a schematic diagram of a display in accordance with an embodiment of the present invention. 2 is a gray scale value histogram in accordance with an embodiment of the present invention. 3 is a schematic diagram of adjusting grayscale values in accordance with an embodiment of the present invention. FIG. 4 is a flow chart of a brightness adjustment method according to an embodiment of the invention.

Claims (14)

A brightness adjustment method is applicable to a display, and a display panel of the display includes a plurality of pixels, wherein the brightness adjustment method comprises: determining a maximum pixel value of each of the pixels in a picture; Generating a grayscale value histogram according to the number of the grayscale values corresponding to the maximum pixel value respectively; determining whether an index value is generated according to the grayscale value histogram; obtaining corresponding to the a one-pixel gain value of the index value; and adjusting each of the pixels in the picture according to the pixel gain value. The brightness adjustment method of claim 1, wherein the pixels each include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and determine the maximum of the pixels in the picture. The step of pixel values includes: comparing the red sub-pixels, the green sub-pixels, and the blue sub-pixels of the pixels to determine the maximum pixel value of each of the pixels. The brightness adjustment method of claim 1, wherein the display panel is an RGBW panel. The brightness adjustment method according to claim 1, wherein the step of determining whether the index value is generated according to the grayscale value histogram comprises: using a maximum grayscale value of the grayscale value histogram to a minimum gray The order value sequentially accumulates the number corresponding to the different gray scale values, until a cumulative quantity value is greater than or equal to a critical quantity value, and then stops accumulating, and determines that the last accumulated gray scale value is the index value. The brightness adjustment method of claim 1, wherein the step of obtaining the pixel gain value corresponding to the index value according to the lookup table comprises: obtaining a corresponding gain value according to the index value, and obtaining the gain value Divide by a preset coefficient to obtain the pixel gain value. The brightness adjustment method of claim 1, wherein the step of adjusting the pixels in the picture according to the pixel gain value comprises: respectively, the red sub-pixels and the green sub-pixels of the pixels And the pixel values of the blue sub-pixels are multiplied by the pixel gain values to adjust the pixels. The brightness adjustment method of claim 6, wherein the step of adjusting the pixels in the picture according to the pixel gain value comprises: if the red sub-pixels, the green sub-pixels, and the blue of the pixels Setting the adjusted pixel value of at least one of the sub-pixels to be greater than a maximum pixel value, and setting at least one of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the pixels to the maximum pixel value . A display device includes: a timing controller; a source driver coupled to the timing controller; and a display panel including a plurality of pixels and configured to display a picture, wherein the timing controller is configured to transmit the source driver Driving the display panel, and the timing controller includes: a determining module for determining a maximum pixel value of each of the pixels in the picture; a statistical module for counting the pixels respectively a maximum grayscale value corresponding to the plurality of grayscale values to establish a grayscale value histogram; an analysis module for determining whether to generate an index value according to the grayscale value histogram; And a pixel gain value corresponding to the index value according to a lookup table; and an adjustment module configured to adjust each of the pixels in the picture according to the pixel gain value. The display of claim 8, wherein the pixels each include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the target pixel includes the first pixel, the second pixel, and The third pixel, and the timing controller operates the determining module to compare the red sub-pixel, the green sub-pixel and the blue sub-pixel of each of the pixels to determine the maximum pixel value of each of the pixels . The display of claim 8, wherein the display panel is an RGBW panel. The display device of claim 8, wherein the timing controller operates the analysis module to sequentially accumulate different grayscale values from a maximum grayscale value of the grayscale value histogram to a minimum grayscale value. The quantity is stopped until a cumulative quantity value is greater than or equal to a critical quantity value, and the final accumulated gray level value is determined as the index value. The display device of claim 8, wherein the timing controller operates the search module to obtain a corresponding gain value according to the index value, and divides the gain value by a preset coefficient to obtain the pixel gain. value. The display device of claim 8, wherein the timing controller operates the adjustment module by respectively respectively, respectively, the pixel values of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the pixels Multiply the pixel gain value to adjust the pixels. The display of claim 13, wherein if the adjusted pixel value of at least one of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the pixels is greater than a maximum pixel value, The timing controller operates the adjustment module to set at least one of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the pixels to the maximum pixel value.