CN100514429C - Dynamic tone compensation circuit - Google Patents
Dynamic tone compensation circuit Download PDFInfo
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- CN100514429C CN100514429C CNB2004100884367A CN200410088436A CN100514429C CN 100514429 C CN100514429 C CN 100514429C CN B2004100884367 A CNB2004100884367 A CN B2004100884367A CN 200410088436 A CN200410088436 A CN 200410088436A CN 100514429 C CN100514429 C CN 100514429C
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Abstract
A dynamic contrast compensation circuit is suitable for compensating dynamic image signals input to a display, and mainly comprises an analysis unit, a plurality of gamma voltage generators and a selector. Wherein, the analysis unit is used to analyze the gray scale distribution of the dynamic image signal, and each gamma voltage generator generates gamma voltage according to gamma characteristic curve. The selector is electrically coupled between the analysis unit and the gamma voltage generator for selecting one of the gamma voltage generators according to the analysis result to output gamma voltage corresponding to the dynamic image signal. The dynamic tone compensation circuit changes the gamma value of the driving voltage of the display according to the result of analyzing the gray scale distribution of the dynamic image signal, thereby improving the display quality of the picture.
Description
Technical field
The invention relates to a kind of compensating circuit, and particularly about a kind of invention of dynamic tone compensating circuit of display.
Background technology
Science and technology is flourishing to make the human lives convenient more.Need be dependent on various electronic products everywhere in people's life, for example cash machine, personal computer, mobile phone and televisor etc.Information that people can the electron gain product be provided by display and the state of understanding electronic product.
Display is divided into multiple display according to its video picture principle, and wherein (flatpanel display FPD) replaces conventional cathode ray kinescope (cathode raytube, CRT) display to flat-panel screens gradually.FPD is the general name of display panel shape, comprise LCD (liquid crystal display, LCD), plasma scope (plasma displaypanel, PDP), organic light emitting display (organic light emitting display, OLED) and field emission displays (field emission display, FED) etc.
Generally speaking, LCD is by applying specific driving voltage so that the liquid crystal deflection special angle come display image in order to drive liquid crystal, and this driving voltage is to be provided by picture signal (being generally digital signal) conversion.Yet, aforementioned picture signal, driving voltage size and liquid crystal deflection the angle pass of pixel transmittance even are not to be linear to close, so just need gamma correction circuit to adjust the driving voltage that picture signal provides, so that driving voltage that picture signal provided and liquid crystal deflection angle or pixel penetrance (transmittance) are linear close (linear relationship).
Known character used in proper names and in rendering some foreign names agate bearing calibration is converted to analog driving voltage according to single character used in proper names and in rendering some foreign names agate family curve (gammacharacteristic curve) with digital picture signal, to drive liquid crystal molecule.That is to say, all images signal in the input display all is the driving voltages that are scaled display with identical character used in proper names and in rendering some foreign names agate value, so the bearing calibration of known character used in proper names and in rendering some foreign names agate is not adjusted character used in proper names and in rendering some foreign names agate value along with the change of picture signal, thereby make the audience can't in the black or white partially partially picture of background, clearly watch each image in the picture.Hence one can see that, and the bearing calibration of known character used in proper names and in rendering some foreign names agate also can't distinctly provide best contrast at dynamic image signal, thereby can't provide best display quality.
Summary of the invention
Therefore, purpose of the present invention just provides a kind of dynamic tone compensating circuit, can decide the driving voltage of display according to different picture signals with different character used in proper names and in rendering some foreign names agate family curves.
The present invention proposes a kind of dynamic tone compensating circuit, is suitable for compensating the dynamic image signal that inputs to display.This dynamic tone compensating circuit mainly comprises analytic unit, a plurality of character used in proper names and in rendering some foreign names agate voltage generator (gamma voltage generator), selector switch (selector) and a plurality of on-off element.Wherein, analytic unit is in order to analyzing the gray-scale distribution situation of this dynamic image signal, and exports analytic signal according to analysis result, and each character used in proper names and in rendering some foreign names agate voltage generator produces character used in proper names and in rendering some foreign names agate voltage in order to foundation character used in proper names and in rendering some foreign names agate family curve.Selector switch then is electrically coupled between analytic unit and the character used in proper names and in rendering some foreign names agate voltage generator, in order to select in these character used in proper names and in rendering some foreign names agate voltage generators according to this analytic signal, produce character used in proper names and in rendering some foreign names agate voltage by the character used in proper names and in rendering some foreign names agate family curve in these character used in proper names and in rendering some foreign names agate voltage generators again corresponding to dynamic image signal.Described a plurality of on-off element is electrically coupled with respectively between selector switch and these character used in proper names and in rendering some foreign names agate voltage generators, and the unlatching of described a plurality of on-off element or closed condition are controlled by selector switch.
The present invention can be applicable in the procedure for displaying of dynamic menu, and change the character used in proper names and in rendering some foreign names agate value that desire is converted to dynamic image signal the driving voltage of display, and then improve the display quality of picture according to the GTG of dynamic image signal in each frame time (frame time).
State with other purpose, feature and advantage and can become apparent on the present invention for allowing, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the schematic flow sheet of method of a kind of dynamic tone compensation of a preferred embodiment of the present invention.
Fig. 2 is the block diagram of a kind of dynamic tone compensating circuit of a preferred embodiment of the present invention.
The main element description of symbols
S100: analyze the dynamic image signal that inputs to display, and export analytic signal according to analysis result
S102: select character used in proper names and in rendering some foreign names agate family curve according to analytic signal
S104: export character used in proper names and in rendering some foreign names agate voltage according to selected character used in proper names and in rendering some foreign names agate family curve corresponding to this dynamic image signal
200: the dynamic tone compensating circuit
202: analytic unit
204,204_1,204_2,204_3,204_n: character used in proper names and in rendering some foreign names agate voltage generator
206: selector switch
208: on-off element
AS: analytic signal
DIS: dynamic image signal
Embodiment
Fig. 1 is the schematic flow sheet of method of a kind of dynamic tone compensation of a preferred embodiment of the present invention.The method of this kind dynamic tone compensation is applicable to that compensation inputs to the GTG of the dynamic image signal of display (not expressing among the figure), and this dynamic image signal has different gray-scale distribution in different frame times.Please refer to Fig. 1, the method is analyzed the gray-scale distribution of the dynamic image signal that inputs to display earlier, and exports analytic signal according to analysis result, as described in step S100.In a preferred embodiment, step S100 for example is that (ApplicationSpecific Integrated Circuit ASIC) analyzes dynamic image signal, so that obtain the gray-scale distribution of dynamic image signal by the specific function integrated circuit.
Then, select character used in proper names and in rendering some foreign names agate family curve, as described in step S102 according to the analytic signal of being exported among the step S100.Wherein, the result who goes out when analytic signal is shown is that the GTG of dynamic image signal in this frame time is distributed in the low order timing mostly, then selects the less character used in proper names and in rendering some foreign names agate family curve of character used in proper names and in rendering some foreign names agate value.In a preferred embodiment, for example be the character used in proper names and in rendering some foreign names agate family curve of selecting character used in proper names and in rendering some foreign names agate value to equal 2.0.If the shown result who goes out of analytic signal is that the GTG of dynamic image signal in this frame time is distributed in the high-order timing mostly, then select the bigger character used in proper names and in rendering some foreign names agate family curve of character used in proper names and in rendering some foreign names agate value.In a preferred embodiment, for example be the character used in proper names and in rendering some foreign names agate family curve of selecting character used in proper names and in rendering some foreign names agate value to equal 2.4.In addition, in one embodiment, if the shown result who goes out of analytic signal is that the GTG of dynamic image signal in this frame time is distributed in the scala media timing between high-order and the low order mostly, the character used in proper names and in rendering some foreign names agate family curve of then selecting character used in proper names and in rendering some foreign names agate value to equal 2.2.
From the above, export character used in proper names and in rendering some foreign names agate voltage afterwards again according to selected character used in proper names and in rendering some foreign names agate family curve, as described in step S104 corresponding to this dynamic image signal.In a preferred embodiment, step S104 for example is that (operator, the character used in proper names and in rendering some foreign names agate voltage generator that OP) is constituted is exported the character used in proper names and in rendering some foreign names agate voltage corresponding to dynamic image signal by a plurality of resistance in seriess and arithmetical unit.
It should be noted that, the present invention in each frame time of display frame all repeating step S100 to step S104, export comparatively suitable character used in proper names and in rendering some foreign names agate voltage so that tackle the variation of the gray-scale distribution of each dynamic image signal, and then make the audience can watch preferable picture quality.
The gray-scale distribution situation of the method view image signal of the present invention's dynamic tone compensation decides the character used in proper names and in rendering some foreign names agate value that this dynamic image signal is changed into the driving voltage of display, so the present invention can improve the display quality of display in dynamic menu.Below the circuit of the dynamic tone compensation method of carrying out the present invention will be described for an embodiment, but it is not in order to limit the present invention.So the ordinary skill of technical field that the present invention belongs to should be understood that the circuit that the method for the present invention's dynamic tone compensation still can other form carries out.
Fig. 2 is the block diagram of a kind of dynamic tone compensating circuit of a preferred embodiment of the present invention.Please refer to Fig. 2, dynamic tone compensating circuit 200 is arranged in the display (not expressing among the figure), so that the dynamic image signal DIS that display is received is converted to simulating signal by digital signal, and make the penetrance of this simulating signal and liquid crystal deflection angle or pixel linear.Dynamic tone compensating circuit 200 mainly comprises analytic unit 202, a plurality of character used in proper names and in rendering some foreign names agate voltage generator 204 and selector switch 206.Wherein, analytic unit 202 inputs to the situation of gray-scale distribution of the dynamic image signal DIS of display in order to analysis, and exports analytic signal AS to selector switch 206 according to analysis result.In a preferred embodiment, analytic unit 202 for example is the specific function integrated circuit, in order to analyze the gray-scale distribution situation of dynamic image signal in different frame times.Particularly, analytic unit 202 is for example represented the gray-scale distribution situation of dynamic image signal with statistical graph, and statistical graph judges that the shown picture that goes out of this dynamic image signal is the still middle contrast of deflection of deflection black (low contrast), deflection white (high contrast) in view of the above.
It should be noted that especially in above-mentioned these character used in proper names and in rendering some foreign names agate voltage generators 204, all produce character used in proper names and in rendering some foreign names agate voltage according to the character used in proper names and in rendering some foreign names agate family curve that it had.In addition, character used in proper names and in rendering some foreign names agate voltage generator 204 is made of the resistance and the arithmetical unit of a plurality of series connection respectively, and its character used in proper names and in rendering some foreign names agate voltage generator with at present common is identical haply, the people who is familiar with this technology will be appreciated that its detailed structure, will repeat no more herein.
In addition, in one embodiment, can be provided with on-off element 208 between selector switch 206 and these character used in proper names and in rendering some foreign names agate voltage generators 204, in order to the path between control selector switch 206 and these character used in proper names and in rendering some foreign names agate voltage generators 204.
For instance, when the picture color that the analytic signal display image signals of being exported when analytic unit 202 is manifested is partial to black, then selector switch 206 can equal path between 2.0 the characteristic character used in proper names and in rendering some foreign names agate of the character used in proper names and in rendering some foreign names agate voltage generator 204_1 by on-off element 208 conductings and character used in proper names and in rendering some foreign names agate value, and make character used in proper names and in rendering some foreign names agate voltage generator 204_1 produce character used in proper names and in rendering some foreign names agate voltage, so that watch the audience of picture can in this is partial to the picture of black, clearly watch scenery in this picture corresponding to dynamic image signal according to the character used in proper names and in rendering some foreign names agate family curve that it had.Otherwise, when the picture color deflection that the analytic signal display image signals of being exported when analytic unit 202 is manifested is white, then selector switch 206 can equal path between 2.4 the characteristic character used in proper names and in rendering some foreign names agate of the character used in proper names and in rendering some foreign names agate voltage generator 204_3 by on-off element 208 conductings and character used in proper names and in rendering some foreign names agate value, and makes character used in proper names and in rendering some foreign names agate voltage generator 204_3 produce character used in proper names and in rendering some foreign names agate voltage corresponding to dynamic image signal according to the character used in proper names and in rendering some foreign names agate family curve that it had.In addition, when the picture color that the analytic signal display image signals of being exported when analytic unit 202 is manifested is moderate, then selector switch 206 also can equal path between 2.2 the characteristic character used in proper names and in rendering some foreign names agate of the character used in proper names and in rendering some foreign names agate voltage generator 204_2 by on-off element 208 conductings and character used in proper names and in rendering some foreign names agate value, so that this picture signal can show the picture of better quality.
The present invention analyzes the dynamic image signal that inputs in the display earlier, and obtains the situation of the gray-scale distribution of this picture signal.Select suitable character used in proper names and in rendering some foreign names agate voltage according to this analysis result more afterwards, so that driving display, and then make the color of the shown picture that goes out of display comparatively obvious.Therefore, the present invention can be applicable in the procedure for displaying of dynamic menu, changes character used in proper names and in rendering some foreign names agate value with foundation dynamic image signal different gray-scale distribution in each frame time, and then improves the display quality of picture.And owing to resistance and the arithmetical unit of the character used in proper names and in rendering some foreign names agate voltage generator in the present invention's the dynamic tone compensating circuit by a plurality of series connection constituted, the element cost is not high, therefore can't increase the cost in the manufacturing.
Though the present invention with preferred embodiment openly as above; right its is not in order to limit the present invention; the ordinary skill of any technical field that the present invention belongs to; in thought that does not break away from the present invention and scope; when can doing a little change and improvement, so the present invention's protection domain is as the criterion when looking claims person of defining.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100884367A CN100514429C (en) | 2004-11-03 | 2004-11-03 | Dynamic tone compensation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100884367A CN100514429C (en) | 2004-11-03 | 2004-11-03 | Dynamic tone compensation circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1770250A CN1770250A (en) | 2006-05-10 |
| CN100514429C true CN100514429C (en) | 2009-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100884367A Expired - Fee Related CN100514429C (en) | 2004-11-03 | 2004-11-03 | Dynamic tone compensation circuit |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2793217A3 (en) * | 2007-03-26 | 2015-02-18 | NEC Corporation | Portable phone terminal, image display controlling method, program thereof, and program recording medium |
| CN102446479B (en) * | 2010-10-12 | 2014-04-30 | 群康科技(深圳)有限公司 | Display and driving method thereof |
| CN104021767B (en) * | 2013-03-01 | 2016-12-28 | 刘鸿达 | Gamma curve adjustment method and its gamma voltage generator and display device |
| CN108053797B (en) * | 2017-12-20 | 2019-12-13 | 惠科股份有限公司 | driving method and driving device of display device |
| CN107863083B (en) * | 2017-12-20 | 2019-12-13 | 惠科股份有限公司 | Driving method and driving device of display device |
| CN107978289B (en) * | 2017-12-20 | 2020-02-21 | 惠科股份有限公司 | Driving method and driving device of display device |
| CN107863084B (en) * | 2017-12-20 | 2019-12-13 | 惠科股份有限公司 | Driving method and driving device of display device |
| CN109637470B (en) * | 2018-12-11 | 2020-06-23 | 惠科股份有限公司 | Display panel driving method and display panel |
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| US20020180680A1 (en) * | 2001-06-02 | 2002-12-05 | Samsung Electronics Co, Ltd. | Liquid crystal display with an adjusting function of a gamma curve |
| CN1384485A (en) * | 2001-02-19 | 2002-12-11 | 三星电子株式会社 | LCD with adaptive viewing angle |
| CN1406052A (en) * | 2001-08-13 | 2003-03-26 | 力捷电脑股份有限公司 | Method and system for scanning grey pictures |
| US20030067435A1 (en) * | 2001-10-04 | 2003-04-10 | Hong-Da Liu | Adaptive gamma curve correction apparatus and method for a liquid crystal display |
| US20040056868A1 (en) * | 2002-09-19 | 2004-03-25 | Nec Electronics Corporation | Gamma correcting circuit and panel drive apparatus equipped with gamma correcting circuit |
| CN1506932A (en) * | 2002-12-11 | 2004-06-23 | Lg.飞利浦Lcd有限公司 | Apparatus and method for generating gamma voltage |
| CN1523564A (en) * | 2003-02-18 | 2004-08-25 | 友达光电股份有限公司 | Dynamic gamma value regulating method and circuit for liquid crystal display and display driving circuit |
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2004
- 2004-11-03 CN CNB2004100884367A patent/CN100514429C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1384485A (en) * | 2001-02-19 | 2002-12-11 | 三星电子株式会社 | LCD with adaptive viewing angle |
| US20020180680A1 (en) * | 2001-06-02 | 2002-12-05 | Samsung Electronics Co, Ltd. | Liquid crystal display with an adjusting function of a gamma curve |
| CN1406052A (en) * | 2001-08-13 | 2003-03-26 | 力捷电脑股份有限公司 | Method and system for scanning grey pictures |
| US20030067435A1 (en) * | 2001-10-04 | 2003-04-10 | Hong-Da Liu | Adaptive gamma curve correction apparatus and method for a liquid crystal display |
| US20040056868A1 (en) * | 2002-09-19 | 2004-03-25 | Nec Electronics Corporation | Gamma correcting circuit and panel drive apparatus equipped with gamma correcting circuit |
| CN1506932A (en) * | 2002-12-11 | 2004-06-23 | Lg.飞利浦Lcd有限公司 | Apparatus and method for generating gamma voltage |
| CN1523564A (en) * | 2003-02-18 | 2004-08-25 | 友达光电股份有限公司 | Dynamic gamma value regulating method and circuit for liquid crystal display and display driving circuit |
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| Publication number | Publication date |
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| CN1770250A (en) | 2006-05-10 |
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