CN100378793C - Liquid crystal display displaying method and system - Google Patents
Liquid crystal display displaying method and system Download PDFInfo
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- CN100378793C CN100378793C CNB2005100229261A CN200510022926A CN100378793C CN 100378793 C CN100378793 C CN 100378793C CN B2005100229261 A CNB2005100229261 A CN B2005100229261A CN 200510022926 A CN200510022926 A CN 200510022926A CN 100378793 C CN100378793 C CN 100378793C
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Abstract
The present invention relates to a display method for a liquid crystal display, which can be used for overdriving a liquid crystal display of a small portable electronic product. The method comprises the following steps: storing input image data into a first random access storage; synchronously comparing image data of a current frame stored in the first random access storage with image data of a front frame stored in a second random access storage; according to the compared result, normally driving or overdriving a plurality of liquid crystal pixels corresponding to the liquid crystal display, and overdriving the liquid crystal pixels corresponding to pixels when the pixels of the current frame are darker than corresponding pixels of the front frame; duplicating the image data of the current frame in the first random access storage to the second random access storage to be used as a reference object for comparing the next frame.
Description
Technical field
The present invention relates to LCD, particularly relate to a kind of display packing and system of LCD of the small portable electronic product of overdriving.
Background technology
Weigh the LCD performance one response time of important pointer is arranged.Response time is the time interval of interior conversion of signals of display and mode switch, also can regard the response speed after each pixel of LCD is for the signal input as, i.e. each liquid crystal molecule expending time in when carrying out the brightness switching.With respect to CRT monitor, the pixel of LCD bright by blackout or by the dark process of bright commentaries on classics in have the relatively long response time, original image can not disappear at once and smear phenomenon, the ghost that this promptly is commonly called as occur when making picture conversion.Especially when watching automobile race, action movie or recreation, the ghost that fast inadequately picture of response time produces can influence picture and watch quality.
Generally speaking, the LCD that the response time is short more, response speed is fast more is good more for the performance of image, so all big enterprises there's no one who doesn't or isn't improve the response time of liquid crystal as possible.Mainly contain four methods and will reduce the liquid crystal pixel response time: reduce liquid crystal material the coefficient of viscosity, improve liquid crystal material dielectric coefficient, reduce the liquid crystal intercellular space and improve liquid crystal drive voltage.Wherein the former two is with to improve material character relevant, and both are then relevant with technology, display circuit design in the back.
(over-driving) technology of overdriving is utilizes the raising liquid crystal drive voltage to reduce the technological means of response time, it is by changing clock controller (Timing controller, T-con) with liquid crystal drive IC the voltage that reverses of liquid crystal is strengthened, thereby allow liquid crystal pixel reverse quickly and reply.
With reference to Figure 1A, Figure 1A is the rough schematic of the liquid crystal display systems of a use overdrive technique.By rgb interface 101, directly do not export and drive display panels 106 by system end (as the drafting card of desktop PC) 100 image datas that transmit, but by clock controller 102 with its with (for example be stored in storer 104, Synchronous Dynamic Random Access Memory SDRAM) former frame in (frame) image data pixel one by one synchronously compares, when the image pixel brightness of present desire demonstration is dark, the liquid crystal pixel of this pixel correspondence of promptly overdriving this moment.
Yet above-mentioned system architecture is not suitable for small-sized portable type electronic product, on the display as mobile phone, PDA(Personal Digital Assistant).This be because, the small portable electronic product is for power saving, usually the image data transmission interface of its use be not the rgb interface as use such as desktop PCs be to import image data to display panels by Synchronous Transfer Mode, and be to use asynchronous data transmission interface such as cpu i/f, by only partly writing/the frame update image data, to reduce the electric power that unnecessary data transmission is consumed.Shown in Figure 1B, the image data of processor 120 is by in cpu i/f 121 write stories 122, wherein, image data 126 write 1202 with the scanning 1204 of image output and asynchronous.In addition, also because therefore writing Inbound, in when writing and revocable of image data 126 caused the over-drive operation of above-mentioned liquid crystal display systems structure can't be applied to (because can't compare each image pixel synchronously) on the portable type electronic product.
Summary of the invention
As described above, existing structure can't allow portable type electronic product make over-drive operation.Fundamental purpose of the present invention promptly is to propose a kind of display packing and system of LCD, allows the liquid crystal panel of portable type electronic product also can use the response time that overdrive technique reduces liquid crystal pixel, and then obtains preferable picture performance.
The invention provides a kind of display packing of LCD, comprise the following step: store one first image data in one first random access memory; Reception is written into one second image data and is stored in one second random access memory with asynchronous system from an asynchronous image interface; This second image data that stores in this first image data that stores in synchronous relatively this first random access memory and second random access memory; Export a controlling signal according to this synchronous comparative result; And duplicate this second image data of storing in this second random access memory to this first random access memory to upgrade this first image data.Wherein, image data writes first random access memory by an asynchronous image interface, particularly cpu i/f with asynchronous system.Comparison step then is to be controlled by an internal clocking synchronously.
The present invention also provides a kind of display system of LCD, comprises: one first random access memory wherein stores one first image data, by temporary earlier first random access memory that is written into of the image data of outside input; One second random access memory has wherein stored one second image data; One comparison means is in order to synchronous comparison corresponding a plurality of pixels in first, second; And a drive unit, decision is overdrived or a plurality of pixels of driven according to comparative result.Wherein, the image data of frame before first image data is, and second image data is the image data of present frame.
Description of drawings
Many viewpoints of the present invention can more clearly be understood with reference to following accompanying drawing.Relevant drawings is not drawn to scale, and its effect is only in the relevant principle of clear performance the present invention.
Figure 1A is the synoptic diagram of the known liquid crystal display systems of overdriving;
Figure 1B is the liquid crystal display systems synoptic diagram of known small portable electronic product;
Fig. 2 A is the synoptic diagram that carries out the liquid crystal display systems of over-drive operation of the present invention;
The system operation flow process of Fig. 2 B displayed map 2A; And
Fig. 3 is for using the treatment scheme synoptic diagram of the present invention to successive frame.
The reference numeral explanation
100 system ends
101 rgb interfaces
102 clock controllers
104 storeies
106 display panels
120 processors
121 cpu i/fs
122 random access memory
1202 write
1204 scannings
220 processors
221 cpu i/fs
222 first random access memory
224 second random access memory
226 comparison means
228 drive units
260 image datas
2202 write-in programs
2204 scanning sequences
2206 scanning sequences
2208 outputs
2210 reproducers
300,302,304 copy steps
310,312 comparison step
Embodiment
Preferable enforcement profit of the present invention can be described in detail as follows.Yet except the content of describing in detail, the present invention can also be widely implements at other embodiment, and scope of the present invention do not limited, and it is as the criterion with claim of the present invention.
Fig. 2 A is the synoptic diagram of the LCD display system that can be applicable to portable type electronic product of a preferred embodiment of the present invention.Wherein, first random access memory 222 is used for receiving image data, is write earlier in first random access memory 222 by the image data of processor 220 through cpu i/f 221 asynchronous inputs.224 of second random access memory are the image datas that stores previous picture, required former frame image information in the time of can providing over-drive operation.226 of comparison means as above-mentioned clock controller T-con, in order to first image data of storage in synchronous comparison first random access memory 222 and second image data of second random access memory, 224 storages, and comparative result exported a controlling signal, and comparative result is sent to the drive unit 228 of liquid crystal panel.Drive unit 228 is as gate drive circuit, in order to drive panel show image picture.Under the normal running, give the panel liquid crystal born of the same parents and desire the rated voltage that display pixel conforms to; When the desire display pixel meets the condition of overdriving, provide the liquid crystal pixel of big voltage with this pixel correspondence of overdriving.Different with the structure of existing technology, comprised two random access memory 222,224 among the embodiment.Below how the system of key diagram 2A is made over-drive operation.
According to above-mentioned, with reference to figure 2B, the image data 260 of input writes in first random access memory 222 arbitrarily.In an embodiment, store a complete image picture in first random access memory 222, that is the image data of a frame.The output 2208 of first random access memory 222, that is the output of picture (frame) is controlled by internal system clock (not accompanying drawing) at present, and the image data (scanning sequence 2204) that is stored in first random access memory 222 by scanning in regular turn constantly produces.Scanning sequence 2004 and write-in program 2002 and asynchronous.Each scanning sequence 2204 has scanned first random access memory 222, promptly finishes the image scan program of a frame.
Be noted that the write-in program 2202 and the scanning sequence 2204 of first random access memory 222 need have mechanism to avoid the image data of the same pixel of access simultaneously.One implementation method as, with scanning sequence 2204 as yet not the storage address of a plurality of pixels (or multi-strip scanning line) of scanning be set at forbidden data and write, make image data when scanning sequence 2202 has scanned corresponding stored device address, just can write first random access memory 222.The method is simpler, only needs to be controlled in by internal clocking to forbid in the special time that some storage address of access can implement.The relevant mechanism of the mutually same storage address of access simultaneously of avoiding should be well known to those skilled in the art, and is not giving unnecessary details in this.
Different with known liquid crystal display systems structure, the present invention is not that the image data output 2208 of direct acquisition first random access memory 222 is to drive panel, but before exporting liquid crystal panel to, compare one by one pixel at a time with the former frame image data that is stored in second random access memory 224 in advance, with in after carry out over-drive operation.Wherein, scanning sequence 2204 and 2206 is synchronously.The former frame image data that second random access memory 224 stores, in can carrying out at the scanning sequence 2204 of first random access memory 222 or afterwards, be copied to second random access memory 224 (reproducer 2210) by first random access memory 222.For example, the data that the scanning that each scanning sequence 2204 is finished a frame is about to be stored in first random access memory 222 copy to second random access memory 224, as the reference relatively of next picture.
Comparison means 226 compares the image pixel of present frame and former frame in regular turn, thereby determines whether the liquid crystal pixel of an image pixel correspondence will do over-drive operation.Relatively can a pixel, the image data of one scan line or a block goes comparison, the present invention does not limit.228 comparative results according to comparison means 226 of drive unit drive liquid crystal panel, and the liquid crystal pixel of eligible (pixel intensity of present frame is bright than former frame) is promptly made over-drive operation and given big voltage, and other then still drives according to normal mode.
And flow process of the present invention can be with reference to figure 3, and the time with three frames in the accompanying drawing is example, and previous column is first random access memory 222, and the image data of input is temporary in earlier wherein; Next classifies second random access memory 224 as, stores the image data of last picture; And middle row are the output of drive unit 228.
At the beginning, in frame one, what be stored in first random access memory 222 is blank picture.And do not contain the information of former frame in second random access memory 224, so the output of drive unit 228 directly shows blank.As described above, after the image data that has scanned first random access memory, 222 1 pixels, one scan line or a block, system will be copied to second random access memory 224 (step 300) automatically, as the reference relatively of next picture.
In the time interval of frame one and frame two, (for example the English alphabet A of accompanying drawing, its brightness is 128) writes first random access memory 224 to suppose that image data is arranged.When frame two, according to the present invention, the image of the image of systematic comparison (step 310) first random access memory 222 and second random access memory 224 of frame one decides output.With 2 of C, D in the accompanying drawing is example, and the brightness of the pixel that C is ordered when frame two during with former frame is identical, so over-drive operation is not made in the output that C is ordered; And the D point is the pixel of English alphabet A, and the pixel corresponding with preceding frame compared secretly, the D point so output the time is overdrived.Generally speaking, relatively export as the darker English alphabet A of accompanying drawing the back with preceding frame.Similarly, system is copied to second random access memory 224 (step 312) with the image data that first random access memory 222 stores.
And it is identical during with frame two in the image drawing face of frame three, the first random access memory 222 input.Be similarly C, D 2 points, compare (step 312) with former frame and be not inconsistent the condition of overdriving, so drive unit 228 is not done the output of overdriving when frame three, and the image data of first random access memory 222 is copied to second random access memory 224 (step 304) subsequently.
Comprehensively above-mentioned, the invention provides a kind of display driving system that can be applicable to the LCD of small portable electronic product, still kept the structure of asynchronous transmission interface.By the structural design of dual-memory, allow the liquid crystal panel of small portable electronic product also can do over-drive operation.In preferred embodiment of the present invention, Fig. 2 A, wherein two random access memory 222 and 224, comparison means 226 can be integrated in the identical product (as being integrated into a drive IC) with drive unit 228.As everyone knows, electronic product is assembled by different vendor, multiple product usually, and as mobile phone, its display panel, panel driving IC, processor, motherboard or the like can be made by different vendor.Therefore, the present invention allows IC design manufacturer (or panel manufacturers) can design the drive IC (or liquid crystal panel) that makes new advances alone, do not change whole display system architectures and do not need processor, motherboard to cooperate, can improve liquid crystal response speed as over-drive operation to liquid crystal panel, it has a great advantage in that industry is commercial.
The above is preferred embodiment of the present invention only, is not in order to limit claim of the present invention; All other do not break away from the equivalence of being finished under the disclosed spirit and changes or modification, all should be included in the claim scope of the present invention.
Claims (14)
1. the driving method of a LCD comprises:
One first random access memory stores one first image data;
One second image data that reception writes with asynchronous system from an asynchronous image interface also is stored in one second random access memory;
This second image data that stores in this first image data that stores in synchronous relatively this first random access memory and second random access memory;
Export a controlling signal according to this synchronous comparative result; And
Duplicate this second image data of storing in this second random access memory to this first random access memory to upgrade this first image data.
2. liquid crystal display driving method as claimed in claim 1, wherein this asynchronous image interface is a cpu i/f.
3. liquid crystal display driving method as claimed in claim 1, wherein this first image data is a preceding frame, and this second image data is a present frame.
4. liquid crystal display driving method as claimed in claim 3, wherein should be synchronously relatively in this first random access memory should before the step of this present frame of storing in frame and this second random access memory also comprise according to a clock signal, read a plurality of pixels of this preceding frame a plurality of pixels corresponding in proper order to compare with this present frame.
5. liquid crystal display driving method as claimed in claim 4 wherein is to be these a plurality of pixels this a plurality of pixels corresponding with this present frame that unit progressive reads this preceding frame with one scan line pixel at every turn.
6. liquid crystal display driving method as claimed in claim 1, wherein this liquid crystal is normal whitening.
7. liquid crystal display driving method as claimed in claim 6, wherein when the pixel of this second image data correspondence during secretly in the pixel of this first image data correspondence, this controlling signal is the liquid crystal pixel of this second image data correspondence of overdriving.
8. liquid crystal display driving method as claimed in claim 1, wherein this liquid crystal is to deceive normal showing.
9. liquid crystal display driving method as claimed in claim 8, wherein when the bright pixel in this first image data correspondence of the pixel of this second image data correspondence, this controlling signal is the liquid crystal pixel of this second image data correspondence of overdriving.
10. the drive system of a LCD comprises:
One first random access memory wherein stores one first image data;
One second random access memory wherein stores one second image data, and an image data of importing with asynchronous method from asynchronous image interface is temporary in this second random access memory earlier;
One comparison means, synchronously corresponding a plurality of pixels in a plurality of pixels and this second image data in this first image data relatively; And
One overdrive circuit unit, according to this comparative result with these a plurality of pixels of overdriving;
Wherein, relatively behind this first image data and this second image data, this second image data is copied to this first random access memory to upgrade this first image data in this comparison means.
11. liquid crystal display-driving as claimed in claim 10 system wherein also comprises a clock generation circuit, the clock that this comparison means produces according to this clock generation circuit reads this first image data and this second image data synchronously to compare.
12. liquid crystal display-driving as claimed in claim 10 system, wherein this asynchronous image interface is a cpu i/f.
13. liquid crystal display-driving as claimed in claim 10 system, wherein this comparison means is to be unit relatively this first image data and this second image data synchronously with one scan line pixel at every turn.
14. liquid crystal display-driving as claimed in claim 10 system, wherein this first image data is the image data of frame before, and the image data that this second image data is a present frame.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100229261A CN100378793C (en) | 2005-12-22 | 2005-12-22 | Liquid crystal display displaying method and system |
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| CNB2005100229261A CN100378793C (en) | 2005-12-22 | 2005-12-22 | Liquid crystal display displaying method and system |
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| CN1787060A CN1787060A (en) | 2006-06-14 |
| CN100378793C true CN100378793C (en) | 2008-04-02 |
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| CNB2005100229261A Expired - Fee Related CN100378793C (en) | 2005-12-22 | 2005-12-22 | Liquid crystal display displaying method and system |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399013B (en) * | 2007-09-26 | 2011-03-23 | 北京京东方光电科技有限公司 | Liquid crystal display device and driving method thereof |
| CN101202020B (en) * | 2007-11-07 | 2010-04-14 | 钰创科技股份有限公司 | Extremely drive device for improving reaction time of display device |
| CN101436385B (en) * | 2007-11-14 | 2010-08-25 | 联咏科技股份有限公司 | Mechanism for saving power supply of display and control method thereof |
| CN101594456B (en) * | 2009-02-18 | 2011-02-09 | 逐点半导体（上海）有限公司 | Image processing device and method |
| CN102682681B (en) * | 2011-03-18 | 2015-02-04 | 青岛海信电器股份有限公司 | Liquid crystal display response time measuring method and device |
| US8933915B2 (en) * | 2011-10-26 | 2015-01-13 | Htc Corporation | Integrated circuit for display apparatus and method thereof |
| CN105761695A (en) | 2016-05-13 | 2016-07-13 | 京东方科技集团股份有限公司 | Driving circuit, driving method thereof and display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1345022A (en) * | 1994-05-24 | 2002-04-17 | 株式会社半导体能源研究所 | Liquid crystal display |
| US6566180B2 (en) * | 2000-09-09 | 2003-05-20 | Lg.Philips Lcd Co., Ltd. | Thin film transistor and fabrication method thereof |
| CN1637833A (en) * | 2003-12-27 | 2005-07-13 | Lg.菲利浦Lcd株式会社 | Method and apparatus for driving liquid crystal display device |
-
2005
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1345022A (en) * | 1994-05-24 | 2002-04-17 | 株式会社半导体能源研究所 | Liquid crystal display |
| US6566180B2 (en) * | 2000-09-09 | 2003-05-20 | Lg.Philips Lcd Co., Ltd. | Thin film transistor and fabrication method thereof |
| CN1637833A (en) * | 2003-12-27 | 2005-07-13 | Lg.菲利浦Lcd株式会社 | Method and apparatus for driving liquid crystal display device |
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