CN101452681A - Method for processing image based on display content for LCD - Google Patents
Method for processing image based on display content for LCD Download PDFInfo
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- CN101452681A CN101452681A CNA2007101967642A CN200710196764A CN101452681A CN 101452681 A CN101452681 A CN 101452681A CN A2007101967642 A CNA2007101967642 A CN A2007101967642A CN 200710196764 A CN200710196764 A CN 200710196764A CN 101452681 A CN101452681 A CN 101452681A
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Abstract
The invention relate to a method for a liquid crystal display to process an image according to displayed content. The liquid crystal display starts black frame inserting function to improve motion blur when the displayed content is a dynamic image, and closes the black frame inserting function to overcome the defect of image flicker when the displayed content is a static image. In addition, the liquid crystal display utilizes a set of gamma curves to perform black frame insertion, registers continuous multi-frame to a frame memory, and analyzes display content of a front frame and a rear frame of each frame to generate a difference value. When the difference value is larger than a default, the luminance of the front half cycle of the frame is corresponding to high gamma curves and the luminance of the rear half cycle of the frame is corresponding to low gamma curves to lighten the image flicker caused by black frame insertion.
Description
Technical field
The present invention relates to a kind of method of the black picture of insertion of LCD, especially relate to the method that a kind of based on display content for LCD inserts black picture.
Background technology
(Liquid Crystal Display LCD) utilizes the rotation of liquid crystal to control the amount of penetrating of light, to show different brightness to LCD.Compared to cathode-ray tube (CRT) (Cathode RayTube, CRT) display uses the display mode of pulsed (impulse-type), LCD then is to use voltage to keep the type of drive of (hold-type) continuously, because the liquid crystal rotation changes continuously, LCD make LCD slower than cathode-ray tube display on the reaction velocity of animate, so can produce dynamic fuzzy when showing the object picture that moves.In order to solve the problem of dynamic fuzzy, the LCD utilization adds the black insertion technology of black picture in picture, and the display mode of coming the emulation cathode-ray tube display for example utilizes flicker backlight to add black picture, or utilizes driving circuit to add black picture.Yet black insertion technology can make LCD produce film flicker, flickering phenomenon, can improve dynamic fuzzy more though the black picture that adds is many more, but that relative picture also can glimmer is serious more.
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of existing black insertion technology.The figure A of Fig. 1 is the synoptic diagram of the shows signal of cathode-ray tube display, and the figure B of Fig. 1 is the synoptic diagram of the shows signal of LCD.Figure A is the time with the transverse axis of figure B, and the longitudinal axis is brightness, represents the shows signal of three frames altogether, and the brightness of frame 1 is 3, and the brightness of frame 2 is 2, and the brightness of frame 3 is 1.Among the figure B, LCD is used black insertion technology, and the duration of supposing a frame is T, the time of preceding T/2 is kept the brightness of shows signal, and the brightness of the time of back T/2 is kept to 0, promptly black full state, just between original frame and frame, add a black picture as the interval.Owing to add black picture, LCD also need transmit the black picture of same quantity of data, in order to keep identical frame update frequency, so the renewal frequency of video data must rise to two times except the data that transmit image.For instance, suppose that the frame update frequency is 60Hz, behind the use black insertion technology, the renewal frequency that LCD transmits video data then is 120Hz.
Black insertion technology can improve the dynamic fuzzy of LCD, but can produce the problem of film flicker, and is especially even more serious when the brightness of multiframe is all identical.Please refer to Fig. 2, Fig. 2 produces the synoptic diagram of film flicker for existing black insertion technology.The figure A of Fig. 2 is the synoptic diagram that LCD is not used the shows signal of black insertion technology, and the figure B of Fig. 2 is the synoptic diagram that LCD is used the shows signal of black insertion technology.Suppose that frame 1 to the brightness of frame 3 all is 2, the user is when the picture of the figure A that watches Fig. 2, do not have the problem of film flicker, but when the user when watching the figure B of Fig. 2, the preceding semiperiod brightness of frame 1 is 2, the later half cycle is 0, semiperiod brightness is 2 before the frame 2, and the later half cycle is 0, and semiperiod brightness is 2 before the frame 3, the later half cycle is 0, so the user can obviously experience picture in flicker.As from the foregoing,, produced the problem of film flicker, influenced the quality of liquid crystal display displays equally though black insertion technology can improve the dynamic fuzzy of LCD.
Summary of the invention
The invention provides a kind of method of processing image based on display content for LCD, the displaying contents that comprises the continuous multiple frames of analyzing this LCD is to produce a difference value; When this difference value during, after each frame of this continuous multiple frames, add a black picture greater than a default value; And show the displaying contents of this continuous multiple frames and a plurality of black picture of insertion.
Description of drawings
Fig. 1 is the synoptic diagram of existing black insertion technology.
Fig. 2 produces the synoptic diagram of film flicker for existing black insertion technology.
Fig. 3 is the synoptic diagram of the image processing system of LCD of the present invention.
Fig. 4 is the synoptic diagram of first group of gamma curve.
Fig. 5 is the synoptic diagram of second group of gamma curve.
Fig. 6 is the process flow diagram of the method for processing image based on display content for LCD of the present invention.
The reference numeral explanation
20 image processing systems, 22 image processors
24 frame memories, 26 frame data
28 display panels
Embodiment
Please refer to Fig. 3, Fig. 3 is the synoptic diagram of the image processing system 20 of LCD of the present invention.LCD black insertion technology commonly used can improve the dynamic fuzzy of LCD when video display, but but can cause the problem of when showing static image, glimmering of LCD, so the present invention utilizes the image processing system 20 of LCD to analyze the signal of video signal of input, make LCD when video display, open the black plug function, when showing static image, close the black plug function to avoid causing the problem of film flicker to improve dynamic fuzzy.Image processing system 20 comprises an image processor 22, a frame memory 24, a plurality of frame data 26 and a display panel 28.The signal of video signal of input LCD comprises a plurality of frame data 26, after image processor 22 receives a plurality of frame data 26, is deposited in the frame memory 24 to carry out data analysis.Image processor 22 each othernesses of analyzing n continuous frame data 26 are so the size of frame memory 24 can store n frame data 26 at least.Basically, the n value is big more to analyze the otherness that image changes more, but big more n value then needs big more frame memory 24, and image processor 22 also needs long time analysis frame data 26.In embodiments of the present invention, with n=4 is example, and image processor 22 is analyzed previous and back two continuous four frame data such as frame at each frame, to obtain an analysis result, again this analysis result and a default value are compared, whether open the black plug function with the decision LCD and show this frame data.For instance, LCD is when showing second frame data, and image processor 22 is stored in first to fourth frame data in the frame memory 24, and it is to add black picture in second frame data that the otherness of analyzing these four frame data again decides.
Please refer to Fig. 4 and Fig. 5, Fig. 4 is the synoptic diagram of first group of gamma curve, and Fig. 5 figure is the synoptic diagram of second group of gamma curve.The common available gamma curve of display device (Gamma curve) is represented gray scale-brightness corresponding relation.Transverse axis is treated as in the input of display device (for example gray-scale value of 0-255), the longitudinal axis is treated as in the brightness that display device is exported, the curve that is drawn just is called gamma curve, and the pairing function of gamma curve promptly can be described as gamma function (Gamma function).Usually the gamma function of display device is Y=(X+e) ^r, and wherein Y is that brightness, X are that output voltage, e are that penalty coefficient, r are gamma value.In embodiments of the present invention, the black plug function of LCD realizes that with one group of gamma curve as shown in Figure 4, wherein gray scale-brightness first corresponding relation is low gamma curve L1, and its gamma value is less than the gamma value of predetermined gamma curve C1; Gray scale-brightness second corresponding relation is high gamma curve H1, and its gamma value is greater than the gamma value of predetermined gamma curve C1.When the black plug function of LCD is opened, correspond to high gamma curve H1 in the preceding semiperiod of frame and produce brightness, produce brightness and correspond to low gamma curve L1 in the later half cycle of frame; When the black plug function of LCD was closed, frame then corresponded to predetermined gamma curve C1 and produces brightness.Utilize above-mentioned black insertion technology can make the difference of preceding semiperiod of a picture and later half cycle brightness less, because the later half cycle picture that inserts not is complete black picture, so user's impression is not stronger, also can alleviate the flicker problem that LCD produces because of black insertion technology.
When LCD is opened the black plug function, the brightness of the preceding semiperiod of the frame of LCD corresponds to high gamma curve H1, the brightness in the later half cycle of frame corresponds to low gamma curve L1, and LCD is utilized high gamma curve H1 and the shown picture of low gamma curve L1, the brightness of measuring with a color analyser, the shown picture of gamma curve C1 that the LCD utilization that must level off to is predetermined, so the mean flow rate of LCD just can remain unchanged, and feels the picture deepening in the time of can not allowing the user view and admire.For instance, when the gray-scale value of a frame is 50, and the predetermined brightness that gamma curve C1 corresponded to is 5 o'clock, employed low gamma curve L1 of later half cycle pairing brightness when the gray-scale value 50 of frame of setting frame earlier is 2, begin to be set in the pairing brightness of preceding semiperiod of frame this moment, measure with color analysis instrument then, supposed when the preceding semiperiod of frame, pairing brightness was 9, the measured brightness of color analysis instrument is 5, then demarcating high gamma curve H1 pairing brightness when the gray-scale value 50 of frame is 9, by that analogy, if gray-scale value one has 255 rank, then demarcate 255 times in this way and just can extrapolate high gamma curve H1.According to above-mentioned method, can push away the gamma curve of many groups, second group of gamma curve as shown in Figure 5 comprises predetermined gamma curve C2, high gamma curve H2 and low gamma curve L2.When image processing system 20 comprised gamma curve more than two groups, image processing system 20 can select one group of gamma curve be used for the black plug function according to the analysis result (being the difference value size) of a plurality of frame data 26.
Please refer to Fig. 6, Fig. 6 is the process flow diagram of the method for processing image based on display content for LCD of the present invention.According to the embodiment of the invention, the flow process of the method for processing image based on display content for LCD such as following step:
Step 110: LCD receives a signal of video signal, and this signal of video signal comprises continuous multiple frames, and this continuous multiple frames is deposited at a frame memory;
Step 120: whether the displaying contents of judging this multiframe changes, if the displaying contents of this multiframe is identical, the expression LCD is just showing a static image, carry out step 160; If the displaying contents difference of multiframe, the expression LCD is just showing a dynamic image, carry out step 140;
Step 130: the displaying contents of continuous multiple frames of analyzing the front and back be deposited at the frame in this frame memory to be producing a difference value, and selects one group of gamma curve;
Step 140: the analysis result of step 130 is compared with a default value, need open the black plug function and improve dynamic fuzzy, carry out step 150 if this difference value, is represented LCD greater than this default value; If this difference value is less than this default value, the expression LCD does not need to open the black plug function, carry out step 160;
Step 150: the brightness of preceding semiperiod of this frame is corresponded to high gamma curve, the brightness in later half cycle of this frame is corresponded to low gamma curve;
Step 160: the brightness of this frame is corresponded to predetermined gamma curve;
Step 170: the displaying contents of exporting this frame is in LCD;
Step 180: finish.
In sum, black insertion technology can improve the dynamic fuzzy when video display of LCD, but the problem that but can cause LCD when showing static image, to glimmer, the analysis result of based on display content for LCD of the present invention, open the black plug function during for dynamic image improving dynamic fuzzy at displaying contents, close the black plug function to avoid causing the problem of film flicker during for static image at displaying contents.In addition, LCD of the present invention is bright utilizes one group of gamma curve to carry out black plug, LCD is deposited at a frame memory with continuous multiple frames, the displaying contents of front and back frame of analyzing each frame is to produce a difference value, when this difference value during greater than a default value, the brightness of preceding semiperiod of this frame is corresponded to high gamma curve, and the brightness in later half cycle of this frame corresponded to the displaying contents that low gamma curve is exported this frame, therefore the difference of the preceding semiperiod of picture and later half cycle brightness is less, also can alleviate the flicker problem that LCD produces because of black plug.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (7)
1. the method for a processing image based on display content for LCD comprises step:
A plurality of displaying contents of continuous multiple frames of analyzing this LCD are to produce a difference value;
When this difference value during, behind each frame of described successive frame, add a black picture greater than a default value; And
Show the described displaying contents of described successive frame and the described black picture of insertion.
2. the method for claim 1, wherein when this difference value during greater than this default value, add behind each frame of described successive frame should black picture for when this difference value during greater than this default value, behind each frame of described successive frame, add according to what one gray scale-brightness first corresponding relation was produced and should deceive picture.
3. the method for claim 1, wherein when this difference value during greater than this default value, adding behind each frame of described successive frame should black picture, comprises step:
Adjust the described displaying contents of described successive frame according to one gray scale-brightness second corresponding relation; And
Adding should be deceived picture according to what one gray scale-brightness first corresponding relation produced.
4. the method for claim 1, wherein when this difference value during greater than this default value, add behind each frame of described successive frame should black picture for wherein when this difference value during greater than this default value, adding behind each frame should black picture, and keeps this frame and deceive picture and show in a frame time with being somebody's turn to do.
5. the method for claim 1, wherein when this difference value during greater than this default value, add behind each frame of this continuous multiple frames should black picture for when this difference value during greater than this default value, add after each frame according to what one first gamma value was produced and should deceive picture, this first gamma value is less than a default gamma value.
6. the method for claim 1, wherein when this difference value during greater than this default value, adding behind each frame of described successive frame should black picture, comprises step:
Adjust the described displaying contents of described successive frame according to one second gamma value, this second gamma value is greater than a default gamma value; And
Adding should be deceived picture according to what one first gamma value produced, and this first gamma value is less than this default gamma value.
7. the method for claim 1 also comprises step:
Provide a frame memory to store the described displaying contents of described successive frame.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101967642A CN101452681A (en) | 2007-12-06 | 2007-12-06 | Method for processing image based on display content for LCD |
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| CNA2007101967642A CN101452681A (en) | 2007-12-06 | 2007-12-06 | Method for processing image based on display content for LCD |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102110403B (en) * | 2009-12-23 | 2013-04-17 | 群康科技(深圳)有限公司 | Method for improving motion blur phenomenon of display and related display |
| US8497887B2 (en) | 2009-06-18 | 2013-07-30 | Chimei Innolux Corporation | Display driving unit and method for using the same |
| TWI420487B (en) * | 2009-07-10 | 2013-12-21 | Innolux Corp | Gray insertion driving method and driver of the same for liquid crystal display |
| CN103702097A (en) * | 2013-12-05 | 2014-04-02 | 四川长虹电器股份有限公司 | Method for promoting brightness of 3D television image |
| CN104821160A (en) * | 2015-05-12 | 2015-08-05 | 深圳市华星光电技术有限公司 | Method for controlling image display |
| US9142188B2 (en) | 2010-03-25 | 2015-09-22 | Nokia Technologies Oy | Methods and apparatus for reducing flickering and motion blur in a display device |
| WO2016197408A1 (en) * | 2015-06-08 | 2016-12-15 | 深圳市华星光电技术有限公司 | Display device capable of performing black frame insertion |
| CN107039010A (en) * | 2017-05-09 | 2017-08-11 | 深圳市华星光电技术有限公司 | The automatic repair system of gamma curve and gamma curve self-repairing method |
| CN109166521A (en) * | 2018-09-27 | 2019-01-08 | 武汉天马微电子有限公司 | Driving method, driving chip and the display device of organic light emitting display panel |
| CN111862895A (en) * | 2020-08-31 | 2020-10-30 | 广州朗国电子科技有限公司 | Global backlight energy consumption reduction method and device, storage medium and display equipment |
| CN112837641A (en) * | 2019-11-25 | 2021-05-25 | 敦泰电子股份有限公司 | Display low frame rate mode driving method |
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2007
- 2007-12-06 CN CNA2007101967642A patent/CN101452681A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8497887B2 (en) | 2009-06-18 | 2013-07-30 | Chimei Innolux Corporation | Display driving unit and method for using the same |
| CN101930715B (en) * | 2009-06-18 | 2013-11-20 | 群康科技(深圳)有限公司 | Gray-insertion drive circuit and method thereof |
| TWI420487B (en) * | 2009-07-10 | 2013-12-21 | Innolux Corp | Gray insertion driving method and driver of the same for liquid crystal display |
| CN102110403B (en) * | 2009-12-23 | 2013-04-17 | 群康科技(深圳)有限公司 | Method for improving motion blur phenomenon of display and related display |
| US10991338B2 (en) | 2010-03-25 | 2021-04-27 | Nokia Technologies Oy | Apparatus, display module and method for adaptive blank frame insertion |
| US9142188B2 (en) | 2010-03-25 | 2015-09-22 | Nokia Technologies Oy | Methods and apparatus for reducing flickering and motion blur in a display device |
| CN103702097A (en) * | 2013-12-05 | 2014-04-02 | 四川长虹电器股份有限公司 | Method for promoting brightness of 3D television image |
| CN104821160A (en) * | 2015-05-12 | 2015-08-05 | 深圳市华星光电技术有限公司 | Method for controlling image display |
| CN104821160B (en) * | 2015-05-12 | 2017-09-12 | 深圳市华星光电技术有限公司 | Method for controlling image to show |
| WO2016197408A1 (en) * | 2015-06-08 | 2016-12-15 | 深圳市华星光电技术有限公司 | Display device capable of performing black frame insertion |
| CN107039010A (en) * | 2017-05-09 | 2017-08-11 | 深圳市华星光电技术有限公司 | The automatic repair system of gamma curve and gamma curve self-repairing method |
| CN107039010B (en) * | 2017-05-09 | 2020-01-31 | 深圳市华星光电技术有限公司 | Automatic gamma curve repairing system and automatic gamma curve repairing method |
| CN109166521B (en) * | 2018-09-27 | 2020-10-02 | 武汉天马微电子有限公司 | Driving method of organic light-emitting display panel, driving chip and display device |
| CN109166521A (en) * | 2018-09-27 | 2019-01-08 | 武汉天马微电子有限公司 | Driving method, driving chip and the display device of organic light emitting display panel |
| CN112837641A (en) * | 2019-11-25 | 2021-05-25 | 敦泰电子股份有限公司 | Display low frame rate mode driving method |
| CN112837641B (en) * | 2019-11-25 | 2023-09-12 | 敦泰电子股份有限公司 | Display low frame rate mode driving method |
| CN111862895A (en) * | 2020-08-31 | 2020-10-30 | 广州朗国电子科技有限公司 | Global backlight energy consumption reduction method and device, storage medium and display equipment |
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Open date: 20090610 |