CN101882417B - Display device and gamma voltage generator - Google Patents
Display device and gamma voltage generator Download PDFInfo
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- CN101882417B CN101882417B CN 201010218664 CN201010218664A CN101882417B CN 101882417 B CN101882417 B CN 101882417B CN 201010218664 CN201010218664 CN 201010218664 CN 201010218664 A CN201010218664 A CN 201010218664A CN 101882417 B CN101882417 B CN 101882417B
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Abstract
The invention relates to a display device and a gamma voltage generator. The gamma voltage generator comprises a gamma reference voltage generating unit and a partial voltage unit. The gamma reference voltage generating unit receives a picture update rate signal. When the picture update rate signal expresses that the picture update rate of a display panel is first frequency, the gamma reference voltage generating unit outputs a plurality of first gamma reference voltages. When the picture update rate signal expresses that the picture update rate of the display panel is second frequency, the gamma reference voltage generating unit outputs a plurality of second gamma reference voltages. The partial voltage unit is coupled with the gamma reference voltage generating unit, and generates a plurality of first gamma voltages according to the first gamma reference voltages, or generates a plurality of second gamma voltages according to the second gamma reference voltages.
Description
Technical field
The invention relates to a kind of display device and gamma voltage generator, and particularly relevant for a kind of display device and gamma voltage generator that prevents film flicker.
Background technology
In recent years, along with semiconductor science and technology is flourish, portable electronic product and flat-panel screens product also rise thereupon.And in the middle of the type of numerous flat-panel screens, liquid crystal display (Liquid Crystal Display, LCD) has become the main flow of each display product immediately based on the advantage such as its low voltage operating, radiationless line scattering, lightweight and volume be little.
Take the portable electronic product of liquid crystal display applications as the mobile computer (notebook, NB) as example.Consume the electric weight of the battery of mobile computer in order effectively to reduce liquid crystal display, Intel Company has proposed a cover SDRRS(seamless dynamic refresh rate switching) technology, showing in the liquid crystal display of mobile computer under the state of tableaux, the picture update rate (frame rate) of display panel is switched to 40Hz by the 60Hz of original demonstration dynamic menu.Thus, can effectively reduce the electric weight that liquid crystal display consumes the battery of mobile computer, thereby reach the purpose of power saving (power saving).
Yet, because the resolution of display panel (resolution) is more and more higher now, to such an extent as to picture element when picture update rate is 60Hz, the duration of charging of picture element can be not enough, stores electric charge to such an extent as to can fill less than corresponding target; And picture element is when picture update rate is 40Hz, and the duration of charging of picture element can increase, and stores electric charge to such an extent as to can be charged to corresponding target.In view of this, under the condition that gamma (gamma) voltage does not change, switch to 40Hz(that is switch to tableaux by dynamic menu by 60Hz with the picture update rate with display panel when mobile computer starts the SDRRS technology), perhaps switch to 60Hz(that is switch to dynamic menu by tableaux by 40Hz) time, because picture element is that duration of charging (T60=1/60) of 60Hz to be different from picture element be the duration of charging (T40=1/40) of 40Hz at picture update rate at picture update rate, to such an extent as to picture element is that also can be different from picture element be the storage electric charge (Q40) of 40Hz at picture update rate for the storage electric charge (Q60) of 60Hz at picture update rate.Thus, when mobile computer starts the SDRRS technology, most likely cause the briliancy of two image switchings variant, thereby cause picture to produce flicker.
Summary of the invention
The purpose of this invention is to provide a kind of gamma voltage generator, can make the gamma curve of display panel under the different pictures turnover rate keep identical.
Another object of the present invention provides a kind of display device, can when picture update rate switches, prevent that picture from producing flicker.
The present invention proposes a kind of gamma voltage generator, is applicable to have the display device of display panel.Gamma voltage generator comprises gamma reference voltage generation unit and partial pressure unit.The gamma reference voltage generation unit receives the picture update rate signal.When the picture update rate of picture update rate signal indication display panel was first frequency, the gamma reference voltage generation unit was exported a plurality of the first gamma reference voltages.When the picture update rate of picture update rate signal indication display panel is second frequency.The gamma reference voltage generation unit is exported a plurality of the second gamma reference voltages.Partial pressure unit couples the gamma reference voltage generation unit, producing a plurality of the first gamma voltages according to these first gamma reference voltages, or produces a plurality of the second gamma voltages according to these second gamma reference voltages.
In one embodiment of this invention, above-mentioned these the first gamma voltage formed gamma curve when the picture update rate of display panel is first frequency is same as these second gamma voltages formed gamma curve when the picture update rate of display panel is second frequency.
In one embodiment of this invention, the first gamma reference voltage of above-mentioned part is same as the part of corresponding same GTG value in the second gamma reference voltage.
In one embodiment of this invention, above-mentioned when the GTG value levels off to maximum gray value or minimum gray value, the difference of each first gamma reference voltage and the second gamma reference voltage of corresponding same GTG value can be less.
In one embodiment of this invention, a little first gamma voltages of above-mentioned part are same as the part of corresponding same GTG value in a little the second gamma voltages.
In one embodiment of this invention, when the GTG value leveled off to maximum gray value or minimum gray value, the difference of each first gamma voltage and the second gamma voltage of corresponding same GTG value can be less.
In one embodiment of this invention, above-mentioned first frequency is 60 Hz, and second frequency is 40 Hz.
The present invention proposes a kind of display device in addition, and it comprises that display panel, time schedule controller reach as mentioned above gamma voltage generator.Time schedule controller produces the picture update rate signal according to the picture update rate of display panel.Gamma voltage generator couples time schedule controller.
In one embodiment of this invention, above-mentioned display panel is normality display white (normal white).
In one embodiment of this invention, above-mentioned display panel is that normality shows black (normal black).
Based on above-mentioned, display device of the present invention and gamma voltage generator, its gamma voltage generator provides respectively the first gamma voltage and the second gamma voltage under different picture update rates, display panel is then driven by the first gamma voltage or the second gamma voltage that gamma voltage generator provides.By this, it is identical that the gamma curve of display panel under the different pictures turnover rate kept, and then prevent film flicker.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphic being described in detail below.
Description of drawings
Fig. 1 is the system schematic according to the display device of one embodiment of the invention.
Fig. 2 is that Fig. 1 is according to the system schematic of the gamma voltage generator of one embodiment of the invention.
Fig. 3 is the gamma graph that the first gamma voltage is applied to the different pictures turnover rate.
[primary clustering symbol description]
100: display device
110: time schedule controller
120: gate pole driver
130: gamma voltage generator
140: source electrode driver
150: display panel
210: the gamma reference voltage generation unit
220: partial pressure unit
310,320: curve
DS: show data
FRS: picture update rate signal
VD: driving voltage
VR1, VR2: gamma reference voltage
VG1, VG2: gamma voltage.
Embodiment
Fig. 1 is the system schematic according to the display device of one embodiment of the invention.Please refer to Fig. 1, in the present embodiment, display device 100 comprises time schedule controller 110, gate pole driver 120, gamma voltage generator 130, source electrode driver 140 and display panel 150.Time schedule controller 110 receptions show data DS, according to showing that data DS judges the picture update rate of display panel 150, with the picture update rate generation picture update rate signal FRS of foundation display panel 150.And time schedule controller 110 is according to showing data DS control grid driver 120 output scanning signal SC, to open each the row picture element (not illustrating) on the display panel 150.
Fig. 2 is that Fig. 1 is according to the system schematic of the gamma voltage generator 130 of one embodiment of the invention.Please refer to Fig. 2, in the present embodiment, gamma voltage generator 130 comprises gamma reference voltage generation unit 210 and partial pressure unit 220.Gamma reference voltage generation unit 210 receives picture update rate signal FRS.When picture update rate signal FRS represented that the picture update rate of display panel 150 is first frequency, then gamma reference voltage generation unit 210 was exported a plurality of the first gamma reference voltage VR1.When picture update rate signal FRS represented that the picture update rate of display panel 150 is second frequency, then gamma reference voltage generation unit 210 was exported a plurality of the second gamma reference voltage VR2.
Wherein, gamma reference voltage generation unit 210 can be a memory element, to store these the first gamma reference voltage VR1 and these second gamma reference voltages VR2.And partial pressure unit 220 can be comprised of the resistance of a plurality of serial connections, so that these the first gamma reference voltage VR1 and these second gamma reference voltages VR2 are carried out dividing potential drop.
Fig. 3 is the gamma graph that the first gamma voltage is applied to the different pictures turnover rate.Please refer to Fig. 3, in the present embodiment, display panel 150 is with normality display white (normal white), then 310 of curves are the gamma curve that the first gamma voltage VG1 forms when display panel 150 shows with 60 Hz, and 320 of curves are the gamma curve that the first gamma voltage VG1 forms when display panel 150 shows with 40 Hz.Overlap because gamma curve 310 presents part with gamma curve 320, part does not overlap, that is the first gamma voltage VG1 can be different in the asynchronous display effect of picture update rate.For in picture update rate not simultaneously gamma curve can remain unchanged therefore in addition design the second gamma voltage VG2.
With GTG value 32, the briliancy that curve 310 corresponds to is 70.Be 70 o'clock in briliancy, the GTG value that curve 320 corresponds to is 33.According to above-mentioned, the driving voltage VD that the second gamma voltage VG2 corresponds to GTG value 32 can equal the driving voltage VD that the first gamma voltage VG2 corresponds to GTG value 33.And the corresponding driving voltage VD of other GTG value can also determine by aforesaid way among the second gamma voltage VG2, then repeats no more at this.Therefore, when picture update rate was 60 Hz, then gamma voltage generator 130 was exported a plurality of the first gamma voltage VG1; When picture update rate was 40 Hz, then gamma voltage generator 130 was exported a plurality of the second gamma voltage VG2.By this, can be when picture update rate change, the shown gamma curve of display panel can be maintained at curve 310, to avoid film flicker.
In addition, as shown in Figure 3, when the GTG value levels off to GTG value 0, gamma curve 310 can diminish with the difference of gamma curve 320, even identical, that is to level off to 63(in the GTG value be the maximum gray value), the difference of each first gamma voltage VG1 and the second gamma voltage VG2 of corresponding same GTG value can be less.When the GTG value levels off to GTG value 63, gamma curve 310 can diminish equally with the difference of gamma curve 320, even identical, that is to level off to 0(in the GTG value be the minimum gray value), the difference of each first gamma voltage VG1 and the second gamma voltage VG2 of corresponding same GTG value equally can be less.
Owing to the first gamma voltage VG1 is that the first gamma reference voltage VR1 dividing potential drop produces, and the second gamma voltage VG2 is that the second gamma reference voltage VR2 dividing potential drop produces, therefore the difference of the first gamma reference voltage VR1 and the second gamma reference voltage VR2 of corresponding same GTG value levels off to 63 or can diminish at 0 o'clock in the GTG value, even is zero.One group of first gamma reference voltage VR1 and one group of second gamma reference voltage VR2 that table 1 measures for describing actual amount, wherein corresponding same GTG value is shown in same tabulation.
As shown in table 1, the first gamma reference voltage VR1 of part is same as the part of corresponding same GTG value among the second gamma reference voltage VR2, and identical part is for leveling off to maximum gray value and minimum gray value.In like manner, the first gamma voltage VG1 of part also can be same as the part of corresponding same GTG value among the second gamma voltage VG2, and identical part is similarly and levels off to maximum gray value (namely 63) and minimum gray value (namely 0).
It is worth mentioning that, above-described embodiment is as example take display panel 150 normality display white, and in other embodiments, can display panel 150 normalities show that black is example, curve 320 then is the gamma curve that the first gamma voltage VG1 forms when display panel 150 shows with 60 Hz, and 310 of curves are the gamma curve that the first gamma voltage VG1 forms when display panel 150 shows with 40 Hz.And the second gamma voltage VG2 deciding means can with reference to above-mentioned explanation, then repeat no more at this.
Table 1
In sum, its gamma voltage generator provides respectively the first gamma voltage and the second gamma voltage under different picture update rates, and display panel then drives according to the first gamma voltage or the second gamma voltage that gamma voltage generator provides.By this, it is identical that the gamma curve of display panel under the different pictures turnover rate kept, and then avoid film flicker.
Although the present invention discloses as above with embodiment; so it is not to limit the present invention; have in the technical field under any and usually know the knowledgeable; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (4)
1. a gamma voltage generator is applicable to have a display device of a display panel, it is characterized in that, comprising:
One gamma reference voltage generation unit comprises a memory element, receive a picture update rate signal, when the picture update rate of this this display panel of picture update rate signal indication is a first frequency, then export a plurality of the first gamma reference voltages, when the picture update rate of this this display panel of picture update rate signal indication is a second frequency, then export a plurality of the second gamma reference voltages, and wherein those first gamma reference voltages of part are same as the part of corresponding same GTG value in those second gamma reference voltages; And
One partial pressure unit, couple this gamma reference voltage generation unit, to produce a plurality of the first gamma voltages according to those first gamma reference voltages, or produce a plurality of the second gamma voltages according to those second gamma reference voltages, and wherein those first gamma voltages of part are same as the part of corresponding same GTG value in those second gamma voltages; Wherein those first gamma voltages formed gamma curve when the picture update rate of this display panel is this first frequency is same as those second gamma voltages formed gamma curve when the picture update rate of this display panel is this second frequency; Wherein when the GTG value levels off to a maximum gray value or a minimum gray value, the difference of each those first gamma reference voltage and the second gamma reference voltage of corresponding same GTG value can be less; Wherein when the GTG value levels off to a maximum gray value or a minimum gray value, the difference of each those first gamma voltage and the second gamma voltage of corresponding same GTG value can be less; Wherein this first frequency is 60 Hz, and this second frequency is 40 Hz.
2. a display device is characterized in that, comprising:
One display panel;
One gate pole driver couples display panel;
The one source pole driver couples display panel;
Time schedule controller produces a picture update rate signal according to the picture update rate of this display panel, couples gate pole driver and source electrode driver; And
One gamma voltage generator as claimed in claim 1 couples this time schedule controller.
3. display device according to claim 2, it is characterized in that: wherein this display panel is the normality display white.
4. display device according to claim 2 is characterized in that: wherein this display panel is that normality shows black.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010218664 CN101882417B (en) | 2010-07-06 | 2010-07-06 | Display device and gamma voltage generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010218664 CN101882417B (en) | 2010-07-06 | 2010-07-06 | Display device and gamma voltage generator |
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| Publication Number | Publication Date |
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| CN101882417A CN101882417A (en) | 2010-11-10 |
| CN101882417B true CN101882417B (en) | 2013-03-06 |
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| CN 201010218664 Expired - Fee Related CN101882417B (en) | 2010-07-06 | 2010-07-06 | Display device and gamma voltage generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150170609A1 (en) * | 2013-12-13 | 2015-06-18 | Lg Display Co., Ltd. | Driving Circuit for Display Apparatus |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130249881A1 (en) * | 2012-03-26 | 2013-09-26 | Se-Byung Chae | Display device, apparatus for generating gamma voltage, and method for the same |
| US9653029B2 (en) | 2014-08-05 | 2017-05-16 | Apple Inc. | Concurrently refreshing multiple areas of a display device using multiple different refresh rates |
| US9779664B2 (en) * | 2014-08-05 | 2017-10-03 | Apple Inc. | Concurrently refreshing multiple areas of a display device using multiple different refresh rates |
| CN106652865A (en) * | 2015-08-18 | 2017-05-10 | 中华映管股份有限公司 | Displayer and method for driving displayer |
| TWI626642B (en) * | 2017-06-20 | 2018-06-11 | 友達光電股份有限公司 | Display apparatus and gamma curve compensation circuit and driving method thereof |
| KR20200101570A (en) * | 2019-02-19 | 2020-08-28 | 삼성디스플레이 주식회사 | Source driver and display device including the same |
| CN110910809A (en) * | 2019-11-25 | 2020-03-24 | Tcl华星光电技术有限公司 | Drive circuit and display device |
| CN111968594B (en) * | 2020-09-08 | 2022-04-15 | 京东方科技集团股份有限公司 | Display driving method, display driving system and display device |
| CN112382228A (en) * | 2020-12-02 | 2021-02-19 | 深圳市华星光电半导体显示技术有限公司 | Driving method and driving device of display panel |
| CN112542123A (en) * | 2020-12-04 | 2021-03-23 | Tcl华星光电技术有限公司 | Display and driving method thereof |
| CN112365832A (en) * | 2020-12-08 | 2021-02-12 | 深圳市华星光电半导体显示技术有限公司 | Gamma voltage correction method and device |
| CN114333678B (en) * | 2021-12-29 | 2023-07-18 | 合肥维信诺科技有限公司 | Display control method, device, apparatus, storage medium, and program product |
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| US20080055318A1 (en) * | 2006-08-31 | 2008-03-06 | Glen David I J | Dynamic frame rate adjustment |
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