TWI661420B - Brightness adjustment method and display - Google Patents

Abstract

The invention proposes a brightness adjustment method suitable for a display. The display panel of the display includes a plurality of pixels. The brightness adjustment method includes the steps of: judging the respective maximum pixel values of the plurality of pixels in the picture; and counting the number of the plurality of grayscale values corresponding to the respective maximum pixel values of the plurality of pixels. To establish a grayscale value histogram; determine whether an index value is generated according to the grayscale value histogram; obtain a pixel gain value corresponding to the index value according to a lookup table; and adjust the screen according to the pixel gain value Each of the plurality of pixels. In addition, a display has been proposed.

Description

Brightness adjustment method and display

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

With the advancement of technology, liquid crystal displays (Liquid Crystal Display, LCD) 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 the RGB display, the red sub-pixels and green sub-pixels of the RGBW display The total number of pixels and blue sub-pixels will be less than the RGB display. In other words, if the RGBW display is driven by the driving signal of the RGB display, the overall brightness of the red, green, and blue subpixels of the RGBW display will 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 and the brightness adjustment method of the present invention can determine whether it is necessary to adjust the number of grayscale values corresponding to multiple target pixels in a frame The pixel value of each target pixel, and the brightness adjustment 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 a display panel of the display includes a plurality of pixels. The brightness adjustment method includes the steps of: judging the respective maximum pixel values of the plurality of pixels in the picture; and counting the number of the plurality of grayscale values corresponding to the respective maximum pixel values of the plurality of pixels. To establish a grayscale value histogram; determine whether an index value is generated according to the grayscale value histogram; obtain a pixel gain value corresponding to the index value according to a lookup table; and adjust the screen according to the pixel gain value Each of the plurality of pixels.

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

In an embodiment of the present 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 gray level value histogram includes: sequentially from a maximum gray level value of the gray level value histogram to a minimum gray level value. Accumulate the quantities corresponding to different grayscale values, stop the accumulation until the accumulated quantity value is greater than or equal to the critical quantity value, and determine the final accumulated grayscale value as the index value.

In an embodiment of the present 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. A preset coefficient is used to obtain the pixel gain value.

In an embodiment of the present invention, the step of adjusting the plurality of pixels in the picture according to the pixel gain value includes: by separating the red sub-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 present 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, and After the adjusted pixel value of at least one of the blue sub-pixels is greater than the maximum pixel value, at least one of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the plurality of pixels is adjusted. One is set as 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 judging module is configured to judge the respective maximum pixel values of the plurality of pixels in the picture. The analysis module is configured to determine whether an index value is generated according to the grayscale value histogram. The lookup module is configured to obtain a pixel gain value corresponding to the index value according to a lookup table. The adjustment module is configured to adjust each of the plurality of pixels in the frame according to the pixel gain value.

In an embodiment of the present invention, each of the plurality of pixels includes 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 pixel. A third pixel, and the timing controller operates the judgment module to compare the red sub-pixel, the green sub-pixel, and the blue sub-pixel with 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 present 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 numbers corresponding to different grayscale values from a maximum grayscale value to a minimum grayscale value of the grayscale value histogram, Stop the accumulation until the cumulative quantity value is greater than or equal to the critical quantity value, and determine the final accumulated grayscale value as the index value.

In an embodiment of the present invention, 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. .

In an embodiment of the present invention, the timing controller operates the adjustment module to separate the red sub-pixel, the green sub-pixel, and the blue sub-pixel from each of the plurality of pixels. A pixel value is multiplied by the pixel gain value to adjust the plurality of pixels.

In an embodiment of the present 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, then 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 screen, and then adjust the red subpixels, green subpixels, and blues of the RGBW display panel in the display screen accordingly. Color sub-pixel brightness.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

A plurality of embodiments are presented below to explain the present invention, but the present invention is not limited to the illustrated embodiments. Appropriate combinations are also allowed between embodiments.

FIG. 1 is a schematic diagram of a display according to an embodiment of the 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 may include a plurality of modules, and these modules may be used for image processing. In this embodiment, these modules may include a judgment module 111, a statistics module 112, an analysis module 113, a search module 114, and an adjustment module 115.

In this embodiment, the display 100 is a liquid crystal display (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 may execute the determination module 111, the statistics module 112, the analysis module 113, the search module 114, and the adjustment module 115, so as to implement the image analysis described in the embodiments of the present invention. And adjustment methods. In this embodiment, the judgment 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, but the present invention is not limited thereto. In an embodiment, these modules may also be stored in software in a storage device, so that the timing controller 110 can implement the image analysis and adjustment methods described in the embodiments of the present invention by executing these modules.

In this embodiment, the display panel 130 may be a RGBW display panel (Red-Green-Blue-White). The display panel 130 may include a plurality of pixels, and each pixel includes four sub-pixels, of which 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 this embodiment will decide whether to adjust the red sub-pixel, green sub-pixel, and blue sub-pixel of each pixel according to the maximum pixel value of each pixel corresponding to the number of different grayscale values. The pixel value (brightness value) of a pixel.

In this embodiment, when the display panel 130 displays an image, the timing controller 110 may execute these modules. In this embodiment, for a frame of an image, the judging module 111 may be used to determine a maximum pixel value of each of a plurality of pixels in the frame. The judging module 111 may compare the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the pixels to determine the maximum pixel value of each pixel. For example, if a pixel has a red subpixel value, a green subpixel value, and a blue subpixel 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 may count the number of multiple grayscale values corresponding to the respective maximum pixel values of these pixels to establish a grayscale value histogram. Next, the analysis module 113 can sequentially accumulate the corresponding numbers of different grayscale values from the maximum grayscale value (255) to the minimum grayscale value (0) of the grayscale value histogram until the cumulative quantity value is greater than or equal to After the critical quantity value is stopped, the accumulation is stopped, and the final accumulated gray level value is determined as the index value. In addition, the lookup module 114 can obtain a pixel gain value (Pixel Gain) corresponding to the index value according to a Look Up 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 picture displayed by the display panel 130 can be increased. Incidentally, each of the above-mentioned modules can also continuously adjust a plurality of continuous pictures in an image to perform a dynamic dimming operation.

FIG. 2 is a histogram of grayscale values according to an embodiment of the present invention. Referring to FIG. 1 and FIG. 2, the above-mentioned statistical module 112 can classify the maximum pixel value of each pixel into a corresponding gray level value respectively, so as to establish a gray level value histogram as shown in FIG. 2. In this embodiment, the horizontal axis of the gray level value histogram is a gray level value of 0 to 255, and the vertical axis of the gray level value histogram is a quantity. Therefore, the grayscale value histogram can be used to represent the distribution of the maximum pixel value of each pixel in a picture. Moreover, in this embodiment, the analysis module 113 can sequentially accumulate the numbers corresponding to different grayscale values from the maximum grayscale value (255) of the grayscale value histogram to the minimum grayscale value (0), until the accumulated quantity value The accumulation is stopped after being greater than or equal to the critical quantity value t, and the final accumulated grayscale value is determined as the index value.

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

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

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

FIG. 4 is a flowchart of a brightness adjustment method according to an embodiment of the present invention. Referring to FIG. 1 and FIG. 4, the brightness adjustment method of this embodiment is applicable to at least the display 100 of FIG. 1. In this 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 a maximum pixel value of each of a plurality of pixels in a frame. In step S420, the timing controller 110 may execute the statistics module 112 and count the number of multiple grayscale values corresponding to the respective maximum pixel values of these 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 execute the adjustment module 115 and adjust each of these pixels in the frame according to the pixel gain value. According to this, the brightness adjustment method of this embodiment can effectively adjust the brightness of each of the red, green, and blue sub-pixels of the RGBW display panel in the display screen.

In addition, related device characteristics, image analysis methods, and image adjustment methods of the brightness adjustment method of this embodiment can be obtained from the above description of the embodiments in FIG. 1 to FIG. 3 with sufficient teaching, suggestions, and implementation description, and will not be described again.

In summary, the brightness adjustment method and the display of the present invention can effectively determine the lightness and darkness of each of the red sub-pixel, each green sub-pixel, and each blue sub-pixel in the display panel, and accordingly adjust the overall color brightness of the display panel. In addition, the present invention can also sequentially adjust a plurality of different continuous pictures in an image, so as to dynamically adjust the color brightness of the display panel. Accordingly, the brightness adjustment method and the display of the present invention can provide good display effects.

Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

100‧‧‧ Display

110‧‧‧sequence controller

111‧‧‧ Judgment Module

112‧‧‧ Statistics Module

113‧‧‧analysis module

114‧‧‧Find Module

115‧‧‧ adjustment module

120‧‧‧Source Driver

130‧‧‧display panel

t‧‧‧ critical quantity value

L1, L2‧‧‧lines

S410, S420, S430, S440, S450 ‧‧‧ steps

FIG. 1 is a schematic diagram of a display according to an embodiment of the invention. FIG. 2 is a histogram of grayscale values according to an embodiment of the present invention. FIG. 3 is a schematic diagram of adjusting a grayscale value according to an embodiment of the present invention. FIG. 4 is a flowchart of a brightness adjustment method according to an embodiment of the present invention.

Claims (12)

A brightness adjustment method is applicable to a display, and a display panel of the display includes a plurality of pixels. The brightness adjustment method includes: judging a maximum pixel value of each of the pixels in a frame; and counting each of the pixels. The number of multiple grayscale values corresponding to the other maximum pixel values to build a grayscale value histogram; a maximum grayscale value of the grayscale value histogram is sequentially accumulated to a minimum grayscale value The quantity corresponding to the gray scale value is stopped until a cumulative quantity value is greater than or equal to a critical quantity value, and the final accumulated grey scale value is determined as an index value; a corresponding gain value is obtained according to the index value, and Dividing the gain value by a preset coefficient to obtain the pixel gain value; and adjusting the pixels in the picture according to the pixel gain value. The brightness adjustment method according to item 1 of the scope of the patent application, wherein each of the pixels includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the maximum of each of the pixels in the frame is determined. The pixel value step includes: comparing the red sub-pixel, the green sub-pixel, and the blue sub-pixel with each of the pixels to determine the maximum pixel value of each of the pixels. The brightness adjustment method according to item 1 of the scope of patent application, wherein the display panel is an RGBW panel. The brightness adjustment method according to item 1 of the scope of the patent application, wherein the step of adjusting the pixels in the picture according to the pixel gain value includes: using the pixel values of the red sub-pixels and the green sub-pixels of the pixels respectively. The pixel value of the pixel and the pixel value of the blue sub-pixel are respectively multiplied by the pixel gain value to adjust the pixels. The brightness adjustment method according to item 4 of the scope of patent application, wherein the step of adjusting the pixels in the picture according to the pixel gain value includes: if the red subpixel, the green subpixel, and the blue of the pixels After the adjusted pixel value of at least one of the sub-pixels is greater than a maximum pixel value, at least one of the red sub-pixel, the green sub-pixel, and the blue sub-pixel of the pixels is set as the maximum pixel value. . A display includes: a timing controller; a source driver coupled to the timing controller; and a display panel including a plurality of pixels and used to display a screen, wherein the timing controller is used to pass through the source driver The display panel is driven, and the timing controller includes: a judging module for judging a maximum pixel value of each of the pixels in the picture; and a statistics module for counting the each of the pixels. The number of multiple grayscale values corresponding to the maximum pixel value to create a grayscale value histogram; an analysis module for determining whether an index value is generated based on the grayscale value histogram; a search module To obtain a pixel gain value corresponding to the index value according to a lookup table; and an adjustment module to adjust each of the pixels in the picture according to the pixel gain value. The display according to item 6 of the scope of patent application, wherein the pixels each include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the timing controller operates the judgment module to compare each of the pixels. The other red sub pixels, the green sub pixels, and the blue sub pixels determine the maximum pixel value of each of the pixels. The display according to item 6 of the patent application scope, wherein the display panel is an RGBW panel. The display according to item 6 of the patent application range, wherein the timing controller operates the analysis module to sequentially accumulate different grayscale values from a maximum grayscale value to a minimum grayscale value of the grayscale value histogram. Until a cumulative quantity value is greater than or equal to a critical quantity value, and stop accumulating, and determine the final accumulated grayscale value as the index value. The display according to item 6 of the patent application range, 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 according to item 6 of the scope of patent application, wherein the timing controller operates the adjustment module by dividing the pixel values of the red sub-pixels, the pixel values of the green sub-pixels, and the blue sub-pixels. The pixel value is multiplied by the pixel gain value to adjust the pixels. The display according to item 11 of the scope of patent application, wherein if the adjusted pixel value of at least one of the red subpixel, the green subpixel, and the blue subpixel of the pixels is greater than a maximum pixel value, then 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.