CN101261821A - Gamma curve compensation method, gamma curve compensation circuit and display system - Google Patents
Gamma curve compensation method, gamma curve compensation circuit and display system Download PDFInfo
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- CN101261821A CN101261821A CNA2008100913813A CN200810091381A CN101261821A CN 101261821 A CN101261821 A CN 101261821A CN A2008100913813 A CNA2008100913813 A CN A2008100913813A CN 200810091381 A CN200810091381 A CN 200810091381A CN 101261821 A CN101261821 A CN 101261821A
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Abstract
The invention provides a gamma curve compensation method, a gamma curve compensation circuit and a display system which are suitable for the display system to insert a plurality of grey scale images during the display process to adjust the display effect of the display system, the gray scale brightness of each grey scale image is one of a plurality of grey scale values. The gamma curve compensation methods contains: provide a plurality of corresponding lookup tables aiming at different grey scale values; when a specific grey scale value of the plurality of grey scale values is selected to form one of the grey scale images, select a specific lookup table corresponding to the specific grey scale value from the lookup tables, and take the specific lookup table as the basis of the gamma curve compensation so as to cause the gamma curve of the display system to remain unchanged during the display process. The invention also provides the gamma curve compensation circuit and the display system to execute the method.
Description
Technical field
The present invention relates to a kind of image display technology, and be particularly related to a kind of pulsed drive display system with and gamma curve compensation method and circuit.
Background technology
At present, one of main mode of motion blur (Motion Blur) phenomenon of solution liquid crystal display systems dynamic image is pulsed drive (Impulse-type Driving), and just fixed black is inserted (BlackInsertion) technology.Yet in the pulsed drive mode, fixed black is inserted (Black Insertion) technology and can be caused screen intensity decay (Luminance Decay) and can cause significantly problem of flicker (Flicker).In addition, the reaction time of liquid crystal is also non-linear when drawing on by zero GTG, when initial GTG is that its other higher gray scale of pull-up time ratio is much more, also is unfavorable for improving smear (ghost) phenomenon when hanging down GTG.
For the transition speed of improving problem such as above-mentioned brightness decay, flicker and liquid crystal produces to reduce the smear phenomenon, a kind of dynamic insertion GTG (Dynamic Gray Insertion) technology is suggested, and it determines the GTG value that will insert according to different pictures.
Though, dynamically inserting in the GTG process, can occur along with inserting the situation that different GTG values obtain different gamma (Gamma) output, cause picture to have the part of bright dark inequality, even same color can obtain different color output in zones of different.
Summary of the invention
Purpose of the present invention is a kind of gamma curve compensation method is provided exactly, so that the gamma curve of display system in procedure for displaying is constant.
Another object of the present invention provides a kind of gamma curve compensation circuit, so that the gamma curve of display system in procedure for displaying is constant.
Another purpose of the present invention provides a kind of display system, and its gamma curve in procedure for displaying is constant.
Other purposes of the present invention and advantage can be further understood from disclosed technical characterictic.
For reaching one of above-mentioned or partly or all purposes or other purposes, one embodiment of the invention proposes a kind of gamma curve compensation method, and it is applicable in the display system adjusts the demonstration performance of display system to insert a plurality of gray scale images in procedure for displaying.The GTG brightness of each gray scale image is to form by selecting one in a plurality of GTG values, and the GTG brightness of these gray scale images is incomplete same each other.This gamma curve compensation method comprises: provide corresponding a plurality of look-up table at these different GTG values; When the specific grey-scale value in selecting these GTG values forms one of these gray scale images, from look-up table, select to be worth a corresponding specific lookup table with specific grey-scale; And use the foundation of this specific lookup table as gamma curve compensation, constant with the gamma curve that in procedure for displaying, makes display system.
Another embodiment of the present invention proposes a kind of gamma curve compensation circuit, is applicable in the display system.This gamma curve compensation circuit comprises: image generation circuit, insertion GTG are determined circuit, multiplexer and are searched and compensating circuit.Image produces circuit and produces corresponding original output image signal according to the received image signal that display system received.Insert GTG and determine circuit, and export this gray scale image according to the GTG brightness of received image signal with definite gray scale image that will insert.Multiplexer is electrically coupled to image and produces circuit and insert GTG and determine circuit, is the original display signal that multiplexer is exported in order to select one among the gray scale image therewith from original output image.Search and compensating circuit is electrically coupled to multiplexer to receive this original display signal, and search and compensating circuit provides different a plurality of look-up tables, and in these look-up tables, select specific lookup table, and the original display signal is carried out gamma curve compensation according to this specific lookup table corresponding to the GTG brightness of the gray scale image in the original display signal that is received.
Further embodiment of this invention proposes a kind of display system, comprising: power supply, image receiving end, above-mentioned gamma curve compensation circuit and display screen.Power supply provides electric power to operate for display system; The image receiving end is in order to receive received image signal; Display screen in order to show the original display signal through above-mentioned gamma curve compensation circuit search and compensating circuit carry out gamma curve compensation after the result of gained.
Embodiments of the invention are because of providing corresponding a plurality of look-up table at different GTG values, when the some specific grey-scale values in selecting these GTG values form the GTG brightness of one of a plurality of gray scale images that will insert in the procedure for displaying, from look-up table, select to be worth corresponding specific lookup table with specific grey-scale, and use the foundation of this specific lookup table as gamma curve compensation, to be adjusted to consistent standardization gamma (Normalized Gamma) value (as Gamma2.4).Therefore, in procedure for displaying, can make the gamma curve of display system constant, and then can promote the demonstration performance of display system.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended accompanying drawing, be described in detail below.
Description of drawings
Fig. 1 is the circuit block diagram of display system according to an embodiment of the invention.
Fig. 2 is for inserting the circuit block diagram that GTG is determined circuit according to an embodiment of the invention.
Fig. 3 is the circuit block diagram of display system according to another embodiment of the present invention.
Fig. 4 is the brightness curve figure that inserts the GTG value according to an embodiment of the invention at difference.
Fig. 5 illustrates according to one embodiment of the invention when picture belongs to low GTG, enters GTG and insert the period in a frame, and light source is turned off.
Wherein, description of reference numerals is as follows:
10: display system
11: power supply
13: the image receiving end
15: gamma curve compensation circuit
150: insert GTG and determine circuit
1502: color space conversion module
1504: analysis module
1506: insert the GTG limiting module
1508: the GTG generation module
152: image produces circuit
154: multiplexer
156: search and compensating circuit
158: backlight module control circuit
17: display screen
19: backlight module
L15, L10, L5: GTG value
Td, Tb: the duration of charging of shows signal
Embodiment
Please refer to Fig. 1, it is the circuit block diagram of display system 10 according to an embodiment of the invention.In the present embodiment, display system 10 comprises power supply 11, image receiving end 13, gamma curve compensation circuit 15 and display screen 17.Wherein, power supply 11 provides electric power to operate for display system 10, and image receiving end 13 is in order to the reception received image signal, and display screen 17 is in order to display image.
Gamma curve compensation circuit 15 comprises that inserting GTG determines that circuit 150, image produce circuit 152, multiplexer 154 and search and compensating circuit 156.Wherein, insert GTG and determine circuit 150, and after definite GTG brightness, export this gray scale image according to the GTG brightness of received image signal with definite gray scale image that will insert.The received image signal that image generation circuit 152 is received according to image receiving end 13 produces corresponding original output image signal.Multiplexer 154 is electrically coupled to the insertion GTG and determines that circuit 150 and image produce circuit 152, among inserting the original output image signal that gray scale image that GTG determines circuit 150 outputs and image produce circuit 152 generations, select one thus, the original display signal of being exported as multiplexer 154.Search and compensating circuit 156 is electrically coupled to multiplexer 154 to receive this original display signal.It should be noted that, search and compensating circuit 156 provides different a plurality of look-up tables, and in these look-up tables, select a specific lookup table corresponding to the GTG brightness of the gray scale image in the original display signal that is received, and come the original display signal is carried out gamma curve compensation according to this specific lookup table, constant with the gamma curve that in procedure for displaying, makes display system 10.The original display signal through search and compensating circuit 156 carry out gamma curve compensation after the result of gained will deliver to display screen 17 and show.
Please in the lump with reference to Fig. 2, it is for inserting the circuit block diagram that GTG is determined circuit 150 according to an embodiment of the invention.Insert GTG and determine that circuit 150 comprises color space conversion module 1502, analysis module 1504, inserts GTG limiting module 1506 and GTG generation module 1508.Color space conversion module 1502 is converted to the color space distributed intelligence with the received image signal that image receiving end 13 is received.Analysis module 1504 is electrically coupled to color space conversion module 1502 to receive the color space distributed intelligence.This analysis module 1504 is analyzed the distribution situation of color space distributed intelligence in color space, and exports corresponding analytic signal.Insert GTG limiting module 1506 storage GTG limiting parameters, GTG generation module 1508 then is electrically coupled to analysis module 1504 and inserts GTG limiting module 1506, with analytic signal of being exported according to analysis module 1504 and the GTG limiting parameter that cooperates insertion GTG limiting module 1506 to be stored, the GTG brightness of definite gray scale image that will insert is also exported this gray scale image thus.
Concrete, the above-mentioned gray scale image that will insert is to be unit to cut apart (Division), the same identical GTG value of insertion of cutting apart; Each is cut apart and can be a line, a section (Segment), a frame (Frame) or several frames.Analysis module 1504 can adopt histogram (Histogram) analytic approach or other known analytic approachs, and for example minimum gray is inserted (Minimum Gray Insertion) method and threshold value (Threshold) method waits definite pre-insertion GTG value of respectively cutting apart, and the analytic signal of its output then can be represented this pre-GTG value of inserting.Because the GTG value of image can be divided into 255 grades usually, also is GTG L0～L255; The insertion GTG limiting module 1506 of present embodiment can be restricted to the scope of inserting the GTG value one particular range (L0～L30) for example, and each contiguous cut apart change scope of can restriction inserting GTG (also be that adjacent two rank differences of cutting apart the GTG that will insert are not more than a preset value, for example 5 or 10) or vicinity is cut apart the processing of doing smoothing.GTG generation module 1508 inserts the GTG limiting parameter of storage in the GTG limiting module 1506 according to pre-insertion GTG value and cooperation that analysis module 1504 is determined, the final GTG value that then can obtain the gray scale image that will insert (also is, and export this gray scale image GTG brightness).
Please refer to Fig. 3, the display system 10 in the present embodiment can comprise that also backlight module 19 is to provide light source (not shown) irradiation display screen 17.In this case, display system 10 can be liquid crystal indicator.Further, display system 10 can comprise backlight module control circuit 158, its be electrically coupled to multiplexer 154 and the original display signal exported according to multiplexer 154 in the GTG brightness of gray scale image, the brightness of the light source in the display system 10 is adjusted in control in order to the backlight module drive signal that drives backlight module 19, so that the picture brightness of display system 10 in procedure for displaying can obtain consistent result behind the corresponding look-up table of different insertion GTG collocation, also be that the picture brightness of display system 10 is constant.Wherein, backlight module control circuit 158 can be integrated into gamma curve compensation circuit 150 (as shown in Figure 3), also can be a circuit structure that is independent of outside the gamma curve compensation circuit 150.
A kind of gamma curve compensation method of above-mentioned display system 10 will be described below, display system 10 is inserted a plurality of gray scale images to adjust the demonstration performance of display system 10 in procedure for displaying, the GTG brightness of each gray scale image is to select one by a plurality of GTG values to form, and the GTG brightness of these gray scale images is incomplete same each other.This gamma curve compensation method can may further comprise the steps:
(1) provides corresponding a plurality of look-up table at these different GTG values; Wherein, these look-up tables can by gamma curve compensation circuit 150 search and compensating circuit 156 provides.
When (2) the specific grey-scale value in selecting these GTG values forms the GTG brightness of one of these gray scale images, by searching and compensating circuit 156 is selected from these look-up tables and specific grey-scale is worth a corresponding specific lookup table; And
(3) use the foundation of this specific lookup table as gamma curve compensation, constant in this procedure for displaying, to make the gamma curve of display system 10, for example be adjusted to consistent standardization gamma value (as Gamma 2.4).
Please refer to Fig. 4, though the gamma curve of inserting behind the different GTGs all meets a standardization gamma value (as Gamma 2.4), the intrinsic brilliance of a plurality of gray scale images that insert still might there are differences; Therefore, the gamma curve compensation method of present embodiment also can comprise a brightness correction step (4): adjust the brightness of the light source in the display system 10, and constant in this procedure for displaying, to make the picture brightness of display system 10.Concrete, for the correction of brightness, employed backlight module drive signal in the time of can adjusting the light source that drives display systems 10 by backlight module control circuit 158, for example pulse width modulation (Pulse WidthModulation, PWM) signal and reaching; The pulse width (PulseWidth) that higher insertion GTG value is corresponding less, utilize suitable pulse width modulation signal (for example with higher insertion GTG, the brightness curve of gray scale image GTG L15) is maintained and (also is, do not sacrifice high-high brightness and do not increase the input power), to (for example be inserted into GTG again, GTG L10 and L5) the bigger pulse width of brightness curve utilization of gray scale image up shine upon (as dotted arrow indication among Fig. 4), make brightness curve and gamma curve behind the corresponding look-up table of different insertion GTG collocation, all can obtain the result of unanimity.
In addition, in the procedure for displaying of a plurality of gray scale images of above-mentioned insertion, along with the increase of high gray brightness, minimum gray scale brightness also and then increases, thereby can make that the picture contrast of display system 10 is not good in the procedure for displaying.Therefore, as shown in Figure 5, the gamma curve compensation method of present embodiment also can further comprise a contrast lifting step (5): the part in procedure for displaying is closed light source in the period, increases with the brightness that suppresses low grey menu.Concrete, when picture belongs to low GTG, in a frame, enter GTG and insert the period, can light source be turned off (B/L OFF), increased contrast since thus can the low grey menu of the filtering unnecessary brightness by the backlight module drive signal that backlight module control circuit 158 provides.B/L ON among Fig. 5 refers to that light source is in illuminating state, and Td and Tb then are the duration of charging of shows signal, and the Td+Tb maximum can equal the frame horizontal scanning line time (1H Time).
In sum, embodiments of the invention are because of providing corresponding a plurality of look-up table at different GTG values, when the specific grey-scale value in selecting these GTG values forms the GTG brightness of one of a plurality of gray scale images that will insert in the procedure for displaying, from look-up table, select to be worth corresponding specific lookup table and to use the foundation of this specific lookup table, to be adjusted to consistent standardization gamma value as gamma curve compensation with specific grey-scale.Therefore, in procedure for displaying, can make the gamma curve of display system constant, and then can promote the demonstration performance of display system.Further, by the control of light source is increased to draw high overall contrast with the brightness of picture brightness being revised and suppress low grey menu, can make that the demonstration performance of display system is better.
Though the present invention discloses as above with preferred embodiment; yet it is not in order to limit the present invention; anyly be familiar with this those skilled in the art; without departing from the spirit and scope of the present invention; should do some changes and retouching, so protection scope of the present invention should be looked accompanying Claim institute restricted portion and is as the criterion.
Claims (13)
1. gamma curve compensation method, be applicable in the display system, this display system is inserted a plurality of gray scale images to adjust the demonstration performance of this display system in a procedure for displaying, the GTG brightness of each described gray scale image is to form by selecting one in a plurality of GTG values, and this gamma curve compensation method comprises:
Provide corresponding a plurality of look-up table at different described GTG values;
When the specific grey-scale value in selecting described GTG value forms one of described gray scale image, from described look-up table, select to be worth a corresponding specific lookup table with this specific grey-scale; And
Use the foundation of this specific lookup table as gamma curve compensation, constant in this procedure for displaying, to make the gamma curve of this display system.
2, gamma curve compensation method as claimed in claim 1 also comprises: adjust the brightness of the light source in this display system, and constant in this procedure for displaying, to make the picture brightness of this display system.
3, gamma curve compensation method as claimed in claim 2, the brightness of wherein adjusting this light source in this display system are that employed pulse width modulation signal is reached when driving this light source by adjustment.
4, gamma curve compensation method as claimed in claim 2 also comprises: the part in this procedure for displaying is closed this light source in the period.
5, gamma curve compensation method as claimed in claim 1 also comprises: close a light source in this display system in the period in the part of this procedure for displaying.
6, a kind of gamma curve compensation circuit is applicable in the display system, it is characterized in that comprising: an image produces circuit, produces corresponding one original output image signal according to the received image signal that this display system received;
One inserts GTG determines circuit, according to the GTG brightness of this received image signal with definite gray scale image that will insert, and exports this gray scale image;
One multiplexer is electrically coupled to this image generation circuit and this insertion GTG and determines circuit, in order to select the original display signal that one is exported for this multiplexer among this original output image and this gray scale image; And
One searches and compensating circuit, be electrically coupled to this multiplexer to receive this original display signal, this is searched and compensating circuit provides different a plurality of look-up tables, and in described look-up table, select a specific lookup table, and this original display signal is carried out gamma curve compensation according to this specific lookup table corresponding to the GTG brightness of this gray scale image in this original display signal that is received.
7, gamma curve compensation circuit as claimed in claim 6, also comprise: a backlight module control circuit, be electrically coupled to this multiplexer, and the GTG brightness of this gray scale image in this original display signal of exporting according to this multiplexer, control is in order to drive a backlight module drive signal of the backlight module in this display system.
8, gamma curve compensation circuit as claimed in claim 6, wherein this insertion GTG determines that circuit comprises:
One color space conversion module is converted to a color space distribution information with this received image signal that this display system received;
One analysis module is electrically coupled to this color space conversion module to receive this color space distributed intelligence, and this analysis module is analyzed the distribution situation of this color space distributed intelligence in color space to export a corresponding analytic signal;
One inserts the GTG limiting module, stores a GTG limiting parameter; And
One GTG generation module, be electrically coupled to this analysis module and this insertion GTG limiting module, this analytic signal that this GTG generation module is exported according to this analysis module, the GTG brightness of this gray scale image that cooperates this GTG limiting parameter that this insertion GTG limiting module stored and determine to insert, and export this gray scale image.
9, gamma curve compensation circuit as claimed in claim 6, wherein this display system comprises liquid crystal indicator.
10, a kind of display system comprises:
One power supply provides electric power to operate for this display system;
One image receiving end is in order to receive a received image signal;
One gamma curve compensation circuit comprises:
One image produces circuit, produces corresponding one original output image signal according to the received image signal that this display system received;
One inserts GTG determines circuit, according to the GTG brightness of this received image signal with definite gray scale image that will insert, and exports this gray scale image;
One multiplexer is electrically coupled to this image generation circuit and this insertion GTG and determines circuit, in order to select the original display signal that one is exported for this multiplexer among this original output image and this gray scale image; And
One searches and compensating circuit, be electrically coupled to this multiplexer to receive this original display signal, this is searched and compensating circuit provides different a plurality of look-up tables, and in described look-up table, select a specific lookup table, and this original display signal is carried out gamma curve compensation according to this specific lookup table corresponding to the GTG brightness of this gray scale image in this original display signal that is received; And
One display screen, in order to show this original display signal through this search and compensating circuit carry out gamma curve compensation after the result of gained.
11, display system as claimed in claim 10 also comprises: a backlight module provides light source to expose to this display screen.
12, display system as claimed in claim 11, also comprise: a backlight module control circuit, be electrically coupled to this multiplexer, and the GTG brightness of this gray scale image in this original display signal of exporting according to this multiplexer, control is in order to drive a backlight module drive signal of this backlight module.
13, display system as claimed in claim 10, wherein this insertion GTG determines that circuit comprises:
One color space conversion module is converted to a color space distribution information with this received image signal that this display system received;
One analysis module is electrically coupled to this color space conversion module to receive this color space distributed intelligence, and this analysis module is analyzed the distribution situation of this color space distributed intelligence in color space to export a corresponding analytic signal;
One inserts the GTG limiting module, stores a GTG limiting parameter; And
One GTG generation module, be electrically coupled to this analysis module and this insertion GTG limiting module, this analytic signal that this GTG generation module is exported according to this analysis module, the GTG brightness of this gray scale image that cooperates this GTG limiting parameter that this insertion GTG limiting module stored and determine to insert, and export this gray scale image.
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| US11765305B2 (en) | 2019-12-19 | 2023-09-19 | Boe Technology Group Co., Ltd. | Method for processing image storage medium and apparatus for the same |
| CN113287162A (en) * | 2019-12-19 | 2021-08-20 | 京东方科技集团股份有限公司 | Method for processing image, and storage medium and apparatus therefor |
| CN111554226A (en) * | 2020-05-22 | 2020-08-18 | Tcl华星光电技术有限公司 | Brightness compensation method and device and brightness compensation system |
| WO2022135102A1 (en) * | 2020-12-23 | 2022-06-30 | 成都辰显光电有限公司 | Gamma debugging method and gamma debugging device for display panel |
| CN113192469B (en) * | 2021-04-28 | 2022-07-05 | 深圳市巨烽显示科技有限公司 | Display screen ghost eliminating method and device, computer equipment and storage medium |
| CN113192469A (en) * | 2021-04-28 | 2021-07-30 | 深圳市巨烽显示科技有限公司 | Display screen ghost eliminating method and device, computer equipment and storage medium |
| CN115050326A (en) * | 2022-08-15 | 2022-09-13 | 禹创半导体(深圳)有限公司 | Adaptive visible dimming method for OLED (organic light emitting diode) under strong light |
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