CN112185308B - Display control system and regional digital gain controller thereof - Google Patents
Display control system and regional digital gain controller thereof Download PDFInfo
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- CN112185308B CN112185308B CN201910607555.5A CN201910607555A CN112185308B CN 112185308 B CN112185308 B CN 112185308B CN 201910607555 A CN201910607555 A CN 201910607555A CN 112185308 B CN112185308 B CN 112185308B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
Abstract
A local digital gain controller includes a digital gain control unit for receiving input image data to obtain enhanced image data; a sub-pixel coordinate determining unit for receiving multi-color data of the input image data to obtain the coordinates of the color data; a spatial gain value unit for generating spatial gain values of the constituent color data, respectively, according to the coordinates; and a multiplier for multiplying the enhanced image data by the corresponding spatial gain value to generate the compensated image data. The technical scheme of the invention can improve the uniformity of the color temperature of the liquid crystal display.
Description
Technical Field
The present invention relates to a display control system for a liquid crystal display, and more particularly, to a local digital gain controller.
Background
A Liquid Crystal Display (LCD) is one of flat-panel displays that uses liquid crystal molecules to control the intensity of modulated light to display an image. The liquid crystal display can be applied to various electronic devices such as televisions, computers, mobile phones and the like, and can be applied to indoor or outdoor occasions.
The liquid crystal display includes a plurality of pixels arranged in a matrix, and the display of an image is controlled by control elements (e.g., Thin Film Transistors (TFTs)) respectively. However, due to the electrical or optical manufacturing variation (variation) of the device, non-uniformity of brightness (non-uniform brightness) is formed, resulting in a non-uniform trace (mura) phenomenon that some pixels are brighter or darker.
To improve this display non-uniformity, a de-track (de-mura) mechanism is generally used. The conventional mark removing mechanism of the liquid crystal display uses a sensing technique to determine the non-uniform position and related parameters in advance, and then uses a memory to store the sensed data in advance as a compensation parameter, which is called a mark image (mura map). Before the image is displayed, the trace image is captured to compensate the image data, and the compensated image data is displayed in the corresponding pixel position of the LCD.
In addition to the non-uniform trace (mura) phenomenon, the liquid crystal display generally has a non-uniform color temperature (non-uniform color temperature) phenomenon. Fig. 1A illustrates a simplified pixel of a liquid crystal display, and fig. 1B to 1D illustrate color temperature curves of a portion of the pixel of fig. 1A. From these color temperature curves, it can be known that pixels at different positions have different color temperature characteristics, thereby causing spatial color difference (spatial color difference).
Therefore, a novel display control mechanism is needed to improve the uniformity of the color temperature of the lcd.
Disclosure of Invention
In view of the foregoing, an objective of the present invention is to provide a display control system having an local digital gain controller, which can effectively compensate for color difference in space of a liquid crystal display to improve uniformity of color temperature.
According to an embodiment of the present invention, the local digital gain controller includes a digital gain control unit, a sub-pixel coordinate determination unit, a spatial gain value unit, and a multiplier. The digital gain control unit receives input image data to obtain enhanced image data. The sub-pixel coordinate determining unit receives a plurality of groups of color data of the input image data to obtain the coordinates of the color data. The spatial gain value unit generates spatial gain values of the constituent color data, respectively, according to the coordinates. The multiplier multiplies the enhanced image data by the corresponding spatial gain value to generate compensated image data.
Preferably, the digital gain control unit comprises a look-up table for obtaining the enhanced image data corresponding to the input image data.
Preferably, the spatial gain value unit comprises a spatial gain value look-up table for obtaining the spatial gain value corresponding to the coordinates of the color data.
Preferably, the spatial gain value unit comprises a memory device for storing the spatial gain value look-up table.
According to an embodiment of the present invention, a display control system includes: a local digital gain controller for receiving input image data and performing spatial compensation to obtain compensated image data; and a dithering unit for receiving and performing dithering signal processing on the compensated image data to generate output image data.
Preferably, the local digital gain controller comprises: a digital gain control unit for receiving the input image data to obtain enhanced image data; a sub-pixel coordinate determining unit for receiving the multi-color data of the input image data to obtain the coordinates of the color data; a spatial gain value unit for generating spatial gain values of the constituent color data, respectively, according to the coordinates; and a multiplier for multiplying the enhanced image data by the corresponding spatial gain value to generate the compensated image data.
Preferably, the digital gain control unit comprises a look-up table for obtaining the enhanced image data corresponding to the input image data.
Preferably, the spatial gain value unit comprises a spatial gain value look-up table for obtaining the spatial gain value corresponding to the coordinates of the color data.
Preferably, the spatial gain value unit comprises a memory device for storing the spatial gain value look-up table.
Preferably, the display control system is disposed in a timing controller of the display.
By the technical scheme, the display control system and the regional digital gain controller thereof have the following advantages and effects: the invention has a regional digital gain controller, can effectively compensate the color difference in the space of the liquid crystal display, and is used for improving the uniformity of color temperature.
Drawings
Fig. 1A illustrates a simplified pixel of a liquid crystal display.
Fig. 1B to 1D illustrate color temperature curves of a portion of the pixels of fig. 1A.
FIG. 2 is a system block diagram of an LCD according to an embodiment of the present invention.
Fig. 3 is a system block diagram of a display control system according to an embodiment of the present invention.
Fig. 4 shows a detailed block diagram of the display control system of fig. 3.
FIG. 5 illustrates image data associated with the display control system of FIG. 4.
Fig. 6A illustrates a look-up table of the digital gain control unit of fig. 4.
Fig. 6B, 6C, and 6D illustrate the table look-up of the spatial gain values for the red (R), green (G), and blue (B) data, respectively.
[ description of main element symbols ]
100: the liquid crystal display 11: display panel
12: a gate driver 13: source driver
14: the timing controller 200: display control system
21: the regional digital gain controller 211: digital gain control unit
212: sub-pixel coordinate determination unit 213: spatial gain value unit
214: the multiplier 22: dithering unit
Detailed Description
Fig. 2 shows a system block diagram of the lcd 100 according to the embodiment of the present invention. In the present embodiment, the liquid crystal display 100 may include a display panel 11, which may include a plurality of pixels arranged in a matrix. The liquid crystal display 100 of the present embodiment may include a gate driver (also referred to as a scan driver) 12 for sequentially turning on at least one row of pixels of the display panel 11. The liquid crystal display 100 may include a source driver (also referred to as a data driver) 13 for generating voltages corresponding to image data to the display panel 11 to display an image on the display panel 11. The liquid crystal display 100 may include a Timing Controller (TCON)14 for controlling the gate driver 12 and the source driver 13.
FIG. 3 is a block diagram of a display control system 200 for an LCD to improve color temperature uniformity according to an embodiment of the present invention. In an embodiment, the display control system 200 may be disposed in the timing controller 14 of the liquid crystal display 100 of fig. 2, but is not limited thereto.
In the present embodiment, the display control system 200 may include a local digital gain controller (local digital gain controller)21, which receives the input image data for performing spatial compensation to obtain compensated image data. The input image data includes multi-component color data, such as red (R), green (G), and blue (B) data. The display control system 200 may include a dithering unit 22 that receives and dithers the compensated image data (of the local digital gain controller 21), thereby generating output image data of red (R), green (G), and blue (B).
Fig. 4 shows a detailed block diagram of the display control system 200 of fig. 3. FIG. 5 illustrates image data associated with the display control system 200 of FIG. 4. For example, the input image data at (100 ) includes red (R) data R (100 ), green (G) data G (100 ), and blue (B) data B (100 ). In this embodiment, local digital gain controller 21 may comprise a Digital Gain Control (DGC) unit 211, which receives (the constituent color data (e.g., R, G, B data)) of the input image data to obtain enhanced image data. In one embodiment, the Digital Gain Control (DGC) unit 211 may include a lookup table (lookup table), as illustrated in fig. 6A, for obtaining enhanced image data corresponding to the input image data. For example, as illustrated in FIG. 5, the red (R) data R (100 ) of the input image data is 128, and the look-up table of the Digital Gain Control (DGC) unit 211 can obtain the red (R) data R (100 ) of the enhanced image data as 512. Other constituent color data of the enhanced image data, such as green (G) data G (100 ), blue (B) data B (100 ), can also be obtained in the same principle.
The local digital gain controller 21 of the present embodiment may comprise a sub-pixel coordinate determination unit 212, which receives (the component color data (e.g. R, G, B data)) of the input image data to obtain the coordinates of the component color data.
According to one feature of this embodiment, the local digital gain controller 21 may comprise a spatial gain unit 213 for generating spatial gain values of the constituent color data (e.g., R, G, B data) according to the coordinates obtained by the sub-pixel coordinate determination unit 212. In this embodiment, the spatial gain value unit 213 may include a lookup table (lookup table) of spatial gain values, so as to obtain the spatial gain values corresponding to the coordinates of the component color data (e.g., R, G, B data). Fig. 6B, 6C, and 6D illustrate the table look-up of the spatial gain values for the red (R), green (G), and blue (B) data, respectively. In one embodiment, the space gain unit 213 may include a memory device, such as a Static Random Access Memory (SRAM), a Dynamic Random Access Memory (DRAM), or a flash memory (flash), for storing the space gain lookup table.
The local digital gain controller 21 of the present embodiment may comprise a multiplier 214 for multiplying the enhanced image data (of the Digital Gain Control (DGC) unit 211) by the corresponding spatial gain value (of the spatial gain value unit 213) to generate the compensated image data. For example, as illustrated in fig. 5, the red (R) data R (100 ) of the enhanced image data is 512, the corresponding spatial gain value is 1.1, and the red (R) data R (100 ) of the enhanced image data multiplied by the corresponding spatial gain value is 563(═ 512x 1.1). Other constituent color data of the compensated image data, such as green (G) data G (100 ), blue (B) data B (100 ), can also be obtained in the same principle.
The compensated image data generated by the local digital gain controller 21 is processed by the dithering signal of the dithering unit 22 to obtain the output image data. For example, as illustrated in fig. 5, the red (R) data R (100 ) of the compensated image data is 563, and the output image data R (100 ) is 141 after being processed by the dithering signal of the dithering unit 22. Other constituent color data of the output image data, such as green (G) data G (100 ), blue (B) data B (100 ), can also be obtained in the same principle.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; it is intended that all such equivalent changes and modifications be included within the scope of the present invention as defined by the appended claims.
Claims (9)
1. A local digital gain controller, comprising:
a digital gain control unit for receiving input image data to obtain enhanced image data;
a sub-pixel coordinate determining unit for receiving the multi-color data of the input image data to obtain the coordinates of the color data;
a spatial gain value unit for generating spatial gain values of the constituent color data, respectively, according to the coordinates; and
a multiplier for multiplying the enhanced image data by the corresponding spatial gain value to generate compensated image data.
2. The local digital gain controller of claim 1, wherein: wherein the digital gain control unit comprises a look-up table for obtaining enhanced image data corresponding to the input image data.
3. The local digital gain controller of claim 1, wherein: the space gain value unit comprises a space gain value look-up table so as to obtain the space gain value corresponding to the coordinates of the color data.
4. The local digital gain controller of claim 3, wherein: wherein the spatial gain value unit comprises a memory device for storing the spatial gain value look-up table.
5. A display control system, comprising:
a local digital gain controller for receiving input image data and performing spatial compensation to obtain compensated image data; and
a dithering unit for receiving and performing dithering signal processing on the compensated image data to generate output image data;
wherein the local digital gain controller comprises:
a digital gain control unit for receiving the input image data to obtain enhanced image data;
a sub-pixel coordinate determining unit for receiving the multi-color data of the input image data to obtain the coordinates of the color data;
a spatial gain value unit for generating spatial gain values of the constituent color data, respectively, according to the coordinates; and
a multiplier for multiplying the enhanced image data by the corresponding spatial gain value to generate the compensated image data.
6. The display control system according to claim 5, characterized in that: wherein the digital gain control unit comprises a look-up table for obtaining enhanced image data corresponding to the input image data.
7. The display control system according to claim 5, characterized in that: the space gain value unit comprises a space gain value look-up table so as to obtain the space gain value corresponding to the coordinates of the color data.
8. The display control system according to claim 5, characterized in that: wherein the spatial gain value unit comprises a memory device for storing the spatial gain value look-up table.
9. The display control system according to claim 5, characterized in that: the display control system is arranged in a time sequence controller of the display.
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| CN201910607555.5A CN112185308B (en) | 2019-07-04 | 2019-07-04 | Display control system and regional digital gain controller thereof |
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| CN201910607555.5A CN112185308B (en) | 2019-07-04 | 2019-07-04 | Display control system and regional digital gain controller thereof |
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| CN112185308B true CN112185308B (en) | 2022-03-15 |
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| US7277679B1 (en) * | 2001-09-28 | 2007-10-02 | Arraycomm, Llc | Method and apparatus to provide multiple-mode spatial processing to a terminal unit |
| JP2005057621A (en) * | 2003-08-07 | 2005-03-03 | Sanyo Electric Co Ltd | Video signal processing circuit |
| US7773158B2 (en) * | 2005-10-12 | 2010-08-10 | Panasonic Corporation | Visual processing device, display device, and integrated circuit |
| KR101487548B1 (en) * | 2007-05-18 | 2015-01-29 | 소니 주식회사 | Display device, control method and recording medium for computer program for display device |
| US20160012571A1 (en) * | 2014-07-11 | 2016-01-14 | Samsung Electronics Co., Ltd. | Image processor and image processing system including the same |
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Effective date of registration: 20221103 Address after: Taiwan Tainan new urban Chinese Fenghua in purple Melia Road No. 26 Patentee after: Himax Technologies, Inc. Address before: Taiwan, Tainan, China new town purple Road No. 26 Patentee before: Himax Technologies, Inc. Patentee before: Himax Media Solutions, Inc. |