CN101727833A - Gamma generating system and method suitable for backlight control - Google Patents
Gamma generating system and method suitable for backlight control Download PDFInfo
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- CN101727833A CN101727833A CN200810174610A CN200810174610A CN101727833A CN 101727833 A CN101727833 A CN 101727833A CN 200810174610 A CN200810174610 A CN 200810174610A CN 200810174610 A CN200810174610 A CN 200810174610A CN 101727833 A CN101727833 A CN 101727833A
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Abstract
The invention relates to gamma generating system and method which are suitable for backlight control. A gamma reference voltage generator is controlled by a digital control signal and used for adaptively generating an imitative gamma reference voltage. The digital control signal is specifically arranged so as to rise the highest point of a gamma curve, thereby being used for improving the brightness loss.
Description
Technical field
The present invention relates to a kind of backlight control, particularly relate to a kind of gamma (gamma) reference voltage of backlight control that is applicable to and produce system and method.
Background technology
Backlight control in order to from the back side or the side illuminate a kind of technology of flat-panel screens (for example LCD).Light source can be cold-cathode tube (CCFL), light emitting diode (LED) or other light source.
Fixed backlight no matter how image data or peripheral light change the light that held stationary all can be provided.One of fixed shortcoming backlight is to have light leak (light leakage) phenomenon when rank (" 0 ") are deceived in demonstration, thereby cause bad dynamic contrast characteristic.
In order to increase its contrast, must use dynamic backlight (dynamic backlight, DBL) technology, its dynamically or adaptively (adaptively) according to the distribution scenario of image data or marginal ray to adjust the backlight illumination of integral body or certain specific part.For example, when showing bright image, output high brightness backlight; When show shadow as the time, then weaken output brightness backlight.By this, dynamic backlight is than the fixed higher dynamic contrast that has backlight.Moreover with fixed in comparison backlight, dynamic backlight can reduce the consumption of power.
Yet conventional dynamic is backlight to illuminate show image with digital form, therefore all any processing can't be arranged near the GTG on dark rank (" 0 ") and the GTG on close bright rank (" 255 " are with eight bit resolutions).Therefore, when reduction backlight working period backlight during, can cause the loss (brightness loss) of brightness near being positioned at bright rank (" 255 "), thereby lower static contrast with dimming.
Therefore in view of above-mentioned conventional dynamic many shortcomings backlight, need the mechanism that proposes a kind of novelty badly reducing the luminance loss, thereby improve static contrast, and can keep high dynamic contrast and low light leakage phenomena.
Summary of the invention
According to above-mentioned, one of purpose of the present invention is for providing a kind of novel mechanism to improve the luminance loss and can keep low light leakage phenomena.Moreover the present invention can promote static to dynamic contrast when simultaneously.
According to the embodiment of the invention, the gamma reference voltage generator is controlled by digital control signal, and (adaptively) produces the simulation gamma reference voltage in order to adaptively.Digital control signal is through the peak of ad hoc arrangement with the rising gamma curve, and wherein gamma curve is represented the simulation gamma reference voltage that the gamma reference voltage generator produced and the relation curve of GTG.By this, can improve the luminance loss, thereby improve static contrast, and can keep high dynamic contrast and low light leakage phenomena.
Description of drawings
Fig. 1 shows the dynamic backlight control that use simulation gamma (gamma) reference voltage of the embodiment of the invention produces system.
Fig. 2 A shows the reduction luminance loss's (lightness loss) of the embodiment of the invention flow process.
Fig. 2 B shows the relation of gamma reference voltage and GTG.
Fig. 3 A shows the illumination and the GTG graph of a relation of conventional dynamic backlight control system.
Fig. 3 B shows the illumination and the GTG graph of a relation of the dynamic backlight control system of present embodiment.
The reference numeral explanation
10 gammas (gamma) generator
11 gamma reference voltages
12 digital control signals
13 time schedule controllers
14 digital interfaces
15 source electrode driven integrated circuits
16 digital image datas
17 display panels
18 dynamic backlights
The process step of 20-21 embodiment
30 traditional illumination and GTG relation curves
The illumination of 32 embodiment and GTG relation curve
110 traditional gamma curve
The gamma curve of 112 embodiment
Embodiment
Fig. 1 shows the dynamic backlight control (DBLC) that use simulation gamma (gamma) reference voltage of the embodiment of the invention produces system.In the present embodiment, adaptability (adaptive) or dynamic gamma reference voltage generator (abbreviation gamma generator) 10 is controlled by digital control signal 12 and can produces simulation gamma reference voltage 11 adaptively.Digital control signal 12 is provided via digital interface 14 by time schedule controller (TCON) 13.Digital interface 14 (for example bus) (directly or indirectly) is electrically coupled between gamma generator 10 and the time schedule controller 13.Simulation gamma reference voltage 11 (together with digital image data 16) is fed to a plurality of source electrode driven integrated circuits (IC) 15, in order to proofread and correct the non-linear perception of human vision for digital image data 16 image that forms.Then, image then is shown on the display panel 17, and its light source is provided by 18 of dynamic backlights (DBL).This adaptability gamma generator 10 be disclosed in Seung-Woo Lee's " Contrast Enhancement in Liquid Crystal Displaysby Adaptive Modification of Analog Gamma Reference Voltages ", IEICETrans.Electron., Vol.E90-C, No.11, pp.2083-2087, November 2007.
Fig. 2 A shows the reduction luminance loss's (lightness loss) of the embodiment of the invention flow process, and Fig. 2 B then shows the relation of gamma reference voltage and GTG.In Fig. 2 B, dotted line 110 representative original (or tradition) gamma reference voltage curve (" gamma curve "), solid line 112 then representative through using the gamma curve of being changed behind the present embodiment.At first, in step 20, time schedule controller (TCON) 13 provides optional network specific digit controlling signal 12 to adaptability gamma generator 10 by digital interface 14.Digital control signal 12 is through the peak (upper limit) of special arrangements with (level up) gamma curve that raises, make through gamma curve 112 peaks of change be worth with near or equal admissible maximum voltage (as 5 volts in the accompanying drawing).In this manual, " peak " can censure the top scope of a voltage yardstick (for example 0-5 volt), for example censures the scope on voltage yardstick top 10%.On the practice, do not having under other substantial negative effectiveness influence, the peak of gamma curve can be increased to maximum permissible voltage (as illustrative 5 volts).
In step 21, time schedule controller (TCON) 13 optionally provides another optional network specific digit controlling signal 12 to reduce the minimum point (lower limit) of (level down) gamma curve, make through gamma curve 112 minimum points of change be worth with near or equal admissible minimum voltage (as 0 volt in the accompanying drawing).In this manual, " minimum point " can censure the bottom scope of a voltage yardstick (for example 0-5 volt), for example censures the scope of voltage yardstick bottom 10%.On the practice, do not having under other substantial negative effectiveness influence, the minimum point of gamma curve can be reduced to the minimum voltage (as illustrative 0 volt) that allows.
According to present embodiment, the rising of gamma curve peak can increase substantially bright rank (that is, GTG near " 255 ") illumination, thereby can improve luminance loss's phenomenon, even 18 (Fig. 1) backlight lower the brightness minimizing that backlight working period causes in order to reduce light leakage phenomena.By this, static contrast can be improved, and can keep high dynamic contrast and low light leakage phenomena.
Fig. 3 A shows the illumination (illumination) and GTG graph of a relation of conventional dynamic backlight control system (the gamma curve two-end-point is not raise/reduces), and Fig. 3 B then shows the illumination and the GTG graph of a relation of the dynamic backlight control system (the gamma curve two-end-point is raise/reduces) of present embodiment.For traditional backlight control system (Fig. 3 A), be positioned at zone, bright rank and have sizable luminance loss (shown in hatched example areas).In this figure, on behalf of back lighting device, dotted line 30 lower the formed curve of backlight working period in order to reduce light leakage phenomena.Opposite, for the backlight control system (Fig. 3 B) of present embodiment, luminance loss's phenomenon obtains substantial improvement, and this can obviously be learnt by less hatched example areas.In this figure, solid line 32 is represented in the present embodiment gamma curve two-end-point is implemented the formed curve in rising/reduction back.
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 spirit that invention discloses and changes or modify, and all should be included in the scope of claim of the present invention.
Claims (15)
1. a gamma reference voltage that is applicable to backlight control produces system, comprises:
One gamma reference voltage generator is controlled by digital control signal, in order to produce the simulation gamma reference voltage adaptively;
Wherein this digital control signal is through the peak of ad hoc arrangement with the rising gamma curve, and this gamma curve is represented the simulation gamma reference voltage that this gamma reference voltage generator produced and the relation curve of GTG, by this, and in order to improve the luminance loss.
2. the gamma reference voltage of backlight control that is applicable to as claimed in claim 1 produces system, also comprises time schedule controller, and it provides this digital control signal to this gamma reference voltage generator.
3. the gamma reference voltage of backlight control that is applicable to as claimed in claim 2 produces system, also comprise a digital interface, be connected between this gamma reference voltage generator and this time schedule controller, in order to allow this digital control signal be delivered to this gamma reference voltage generator.
4. the gamma reference voltage of backlight control that is applicable to as claimed in claim 1 produces system, also comprises at least one driver, and it drives a display panel and receives this simulation gamma reference voltage.
5. the gamma reference voltage of backlight control that is applicable to as claimed in claim 1 produces system, and wherein the peak of above-mentioned gamma curve is raised the maximum permissible voltage with this gamma reference voltage generator of convergence.
6. the gamma reference voltage of backlight control that is applicable to as claimed in claim 1 produces system, also comprises:
This digital control signal of ad hoc arrangement is to reduce the minimum point of this gamma curve.
7. the gamma reference voltage of backlight control that is applicable to as claimed in claim 6 produces system, and wherein the minimum point of above-mentioned gamma curve is lowered the minimum permission voltage with this gamma reference voltage generator of convergence.
8. flat-panel screens comprises:
One display panel;
One dynamic backlight, it dynamically provides light source to this display panel;
One gamma reference voltage generator is controlled by digital control signal, in order to produce the simulation gamma reference voltage adaptively;
Time schedule controller, its by a digital interface to provide this digital control signal to this gamma reference voltage generator; And
At least one driver, it receives this simulation gamma reference voltage;
Wherein this digital control signal is through the peak of ad hoc arrangement with the rising gamma curve, and this gamma curve is represented the simulation gamma reference voltage that this gamma reference voltage generator produced and the relation curve of GTG, by this, and in order to improve the luminance loss.
9. flat-panel screens as claimed in claim 8, wherein the peak of above-mentioned gamma curve is raised the maximum permissible voltage with this gamma reference voltage generator of convergence.
10. flat-panel screens as claimed in claim 8 also comprises:
This digital control signal of ad hoc arrangement is to reduce the minimum point of this gamma curve.
11. flat-panel screens as claimed in claim 10, wherein the minimum point of above-mentioned gamma curve is lowered the minimum permission voltage with this gamma reference voltage generator of convergence.
12. a gamma reference voltage production method that is applicable to backlight control comprises:
Be controlled by digital control signal, to produce the simulation gamma reference voltage adaptively; And
This digital control signal of ad hoc arrangement is with the peak of rising gamma curve, and this gamma curve is represented the simulation gamma reference voltage that this gamma reference voltage generator produced and the relation curve of GTG, by this, and in order to improve the luminance loss.
13. the gamma reference voltage production method that is applicable to backlight control as claimed in claim 12, also comprising by time schedule controller provides this digital control signal.
14. the gamma reference voltage production method that is applicable to backlight control as claimed in claim 12 also comprises by at least one driver and receives this simulation gamma reference voltage.
15. the gamma reference voltage production method that is applicable to backlight control as claimed in claim 12 also comprises:
This digital control signal of ad hoc arrangement is to reduce the minimum point of this gamma curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810174610A CN101727833A (en) | 2008-10-28 | 2008-10-28 | Gamma generating system and method suitable for backlight control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810174610A CN101727833A (en) | 2008-10-28 | 2008-10-28 | Gamma generating system and method suitable for backlight control |
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| CN101727833A true CN101727833A (en) | 2010-06-09 |
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| CN200810174610A Pending CN101727833A (en) | 2008-10-28 | 2008-10-28 | Gamma generating system and method suitable for backlight control |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427517A (en) * | 2011-09-30 | 2012-04-25 | 青岛海信电器股份有限公司 | Dynamic contrast adjustment method, dynamic contrast adjustment device and liquid crystal display television |
| CN105976760A (en) * | 2016-06-30 | 2016-09-28 | 维沃移动通信有限公司 | Brightness adjusting method for terminal screen and mobile terminal |
| CN114495863A (en) * | 2022-03-07 | 2022-05-13 | Oppo广东移动通信有限公司 | Screen brightness control method, device, equipment, storage medium and program product |
-
2008
- 2008-10-28 CN CN200810174610A patent/CN101727833A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427517A (en) * | 2011-09-30 | 2012-04-25 | 青岛海信电器股份有限公司 | Dynamic contrast adjustment method, dynamic contrast adjustment device and liquid crystal display television |
| CN105976760A (en) * | 2016-06-30 | 2016-09-28 | 维沃移动通信有限公司 | Brightness adjusting method for terminal screen and mobile terminal |
| CN105976760B (en) * | 2016-06-30 | 2018-12-04 | 维沃移动通信有限公司 | A kind of brightness adjusting method and mobile terminal of terminal screen |
| CN114495863A (en) * | 2022-03-07 | 2022-05-13 | Oppo广东移动通信有限公司 | Screen brightness control method, device, equipment, storage medium and program product |
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Application publication date: 20100609 |