CN105355177A - Liquid crystal display and method for eliminating image sticking phenomenon thereof - Google Patents
Liquid crystal display and method for eliminating image sticking phenomenon thereof Download PDFInfo
- Publication number
- CN105355177A CN105355177A CN201510870767.4A CN201510870767A CN105355177A CN 105355177 A CN105355177 A CN 105355177A CN 201510870767 A CN201510870767 A CN 201510870767A CN 105355177 A CN105355177 A CN 105355177A
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- liquid crystal
- voltage
- gamma voltage
- crystal display
- signal
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
Abstract
The invention discloses a liquid crystal display, comprising a control chip, a P-Gamma IC (Integrated Circuit) and a display module which are electrically connected with each other, wherein the control chip outputs periodic signals and transmits the periodic signals to the P-Gamma IC, so that the P-Gamma IC generates periodically variable Gamma voltage; the P-Gamma IC transmits the Gamma voltage to the display module, thus driving liquid crystal molecules in the display module to deflect. The liquid crystal display can realize periodic variation of the Gamma voltage, thus reducing and eliminating polarization to eliminate the image sticking phenomenon in the liquid crystal display.
Description
Technical field
The present invention relates to a kind of display device and improve the method for ghost phenomena of this display device, particularly relate to a kind of liquid crystal display and improve the method for its ghost phenomena.
Background technology
Liquid crystal display (LiquidCrystalDisplay, LCD) now becomes the market mainstream, and its principle of work is that liquid crystal can deflect under the driving of electric current, and light is easily passed through, thus display image.But liquid crystal may be polarized after being subject to driving for a long time, cause liquid crystal molecule normally can not deflect under signal voltage controls, still can see the vestige of still frame after a period of time, namely ghost phenomena (ImageSticking as illustrated in figs. ia and ib, IS), screen can keep for a long time a width or a part of static picture.
The generation of ghost phenomena mainly liquid crystal polarization causes, simultaneously relevant with present Gamma voltage, Fig. 2 illustrates that normal 8 passages (CH) Gamma voltage powers on, normally work and the process of power-off, can find out, in the process of normal work, each Gamma voltage keeps constant voltage always, and the size and Orientation of the driving force suffered by liquid crystal molecule remains unchanged, be difficult to normal deflection, thus can strengthen ghost phenomena odds.
Summary of the invention
The invention provides a kind of liquid crystal display and improve the method for its ghost phenomena, the cyclical variation of Gamma voltage can be realized, thus reduce and eliminate polarization, to reach the object improving ghost phenomena.
The invention provides a kind of liquid crystal display, comprise interconnective control chip, P-GammaIC and display module, it is characterized in that, described control chip exports periodic signal, and described periodic signal is passed to described P-GammaIC, make described P-GammaIC produce periodically variable Gamma voltage, then described Gamma voltage can be passed in described display module, thus drives the liquid crystal molecule in described display module to deflect.
Wherein, described periodic signal comprises voltage amplitude signal, time interval signal and count signal, described voltage amplitude signal is for controlling the size of Gamma voltage described in each cycle, described time interval signal is for the time interval during controlling each week, and described count signal is used for the quantity of control cycle.
Wherein, the driving of described liquid crystal display comprises power up phase, normal work stage and power-down phase, the Gamma voltage of wherein said power up phase steadily rises, and the Gamma voltage of described power-down phase steadily declines, and the Gamma voltage of described normal work stage can periodically rise or decline.
Wherein, during normal work stage, in one-period, described P-GammaIC keeps normal and exports, and described Gamma voltage does not all change; In second period, positive polarity voltage is raised, keep reverse voltage reduction or constant simultaneously; Normal output is kept in 3rd cycle; Reverse voltage then strengthens by the 4th cycle, keeps positive polarity voltage reduction or constant simultaneously.
Wherein, the rising of the described Gamma voltage in normal work stage or the amplitude of decline can adjust according to the characteristic of the liquid crystal molecule in described display module.
Wherein, described Gamma voltage is 8 passages (CH) Gamma voltage.
The present invention also provides a kind of method changing liquid crystal display ghost phenomena, comprising: export periodic signal by control chip; P-GammaIC receives described periodic signal, and produces periodically variable Gamma voltage, and by described Gamma voltage transmission to display module; The described Gamma voltage of described display module receive periodic change, thus drive the liquid crystal molecule in described display module to deflect.
Wherein, described periodic signal comprises voltage amplitude signal, time interval signal and count signal, described voltage amplitude signal is for controlling the size of Gamma voltage described in each cycle, described time interval signal is for the time interval during controlling each week, and described count signal is used for the quantity of control cycle.
Wherein, the driving of described liquid crystal display comprises power up phase, normal work stage and power-down phase, and at described power up phase, described Gamma voltage steadily rises; In described power-down phase, described Gamma voltage steadily declines; In described normal work stage, described Gamma voltage can periodically rise or decline.
Wherein, during normal work stage, in one-period, described P-GammaIC keeps normal and exports, and described Gamma voltage does not all change; In second period, positive polarity voltage is raised, keep reverse voltage reduction or constant simultaneously; Normal output is kept in 3rd cycle; Reverse voltage then strengthens by the 4th cycle, keeps positive polarity voltage reduction or constant simultaneously.
Wherein, the rising of the described Gamma voltage in normal work stage or the amplitude of decline can adjust according to the characteristic of the liquid crystal molecule in described display module.
Wherein, described Gamma voltage is 8 passages (CH) Gamma voltage.
Compared to prior art, the present invention can the voltage that exports of periodic variation P-GammaIC, simultaneously the Gamma voltage generating period of working stage can be made change, thus reduce and eliminate to polarize, to reach the object improving ghost phenomena.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 a and Fig. 1 b is the example of the ghost phenomena that liquid crystal display occurs.
Fig. 2 is that in prior art, 8CHGamma voltage powers on, normally works and the oscillogram of power-down phase.
Fig. 3 is the schematic diagram of the system producing periodically variable Gamma voltage in the present invention.
Fig. 4 is the oscillogram that in the present invention, P-GammaIC produces periodically variable Gamma voltage.
Fig. 5 is according to the process flow diagram improving the method for liquid crystal display ghost phenomena of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 3 illustrates in liquid crystal display of the present invention the system producing periodically variable Gamma voltage, comprise control chip 1 (ControlIC), P-GammaIC2 and display module 3, control chip 1 is programmable chip, relevant information such as periodic signal information can be programmed by manufacturer in advance, and be input in control chip 1, control chip 1 is producing periodic signal after treatment, this periodic signal comprises voltage amplitude signal, time interval signal and count signal etc., wherein voltage amplitude signal is for controlling the size stating Gamma voltage in each cycle, time interval signal is for the time interval during controlling each week, count signal is used for the quantity of control cycle.P-GammaIC2 and Gamma correction buffer circuit chip able to programme, be then by numerical digit logical circuit after digital-to-analog conversion DAC (Digital-to-AnalogueConversion), produce the integrated chip of each Gamma (GMN) voltage.After periodic signal is delivered to P-GammaIC2 from control chip 1, P-GammaIC2 can produce periodically variable Gamma voltage, and then this Gamma voltage can be passed in display module, thus drives the liquid crystal molecule in display module to deflect.
Fig. 4 is the oscillogram that in the present invention, P-GammaIC produces periodically variable Gamma voltage.In order to promote that liquid crystal produces deflection reaction, the present embodiment adopts a reference voltage V
combe the mode of a ground connection level, distinguish the polarity of voltage of driving voltage, if driving voltage is greater than reference voltage V
com, be then positive polarity voltage, when driving voltage is less than base reference voltage V
com, be then reverse voltage.As shown in Figure 4, P-GammaIC is subject to the control of periodic signal, the adjustment exporting GMN (being GM1-GM8 in the present embodiment) voltage is carried out in the different cycles, the output of Gamma voltage changes as shown in Figure 4, wherein compared with prior art, power on and power-down phase on voltage substantially remain unchanged, mainly operationally change Gamma voltage, make the impact being subject to positive polarity voltage in the one section cycle, the impact of reverse voltage is subject in one period of cycle, thus can in the process driving liquid crystal, eliminate the polarization impact of liquid crystal molecule two sides voltage, to improve ghost phenomena.
Particularly, as shown in Figure 4, voltage during working stage is divided into five cycles, and in one-period, P-GammaIC keeps normal and exports, each Gamma voltage does not all change, in second period, positive polarity voltage is raised (keeping reverse voltage reduction or constant) simultaneously, if this time, liquid crystal had the polarization being subject to negative polarity, (positive polarity voltage strengthens then can to improve this polarization, effectively can reduce negative polarity polarization, vice versa), normal output is kept in 3rd cycle, reverse voltage then strengthens (keeping positive polarity voltage reduction or constant) by the 4th cycle simultaneously, effectively can improve positive polarity polarization, 5th cycle, voltage recovers again normal output, go round and begin again like this and voltage is changed, can ensure that liquid crystal can not remain on a direction polarization for a long time, irreversible liquid crystal molecule is caused to polarize and serious ghost phenomena, just can improve the problem of ghost.Easy understand, is divided into five cycles by the change in voltage in the course of work in the present embodiment, is only example object, and this periodicity can more than 5.
In addition, according to the characteristic of liquid crystal molecule polarization, the amplitude that positive polarity voltage or reverse voltage rise or decline can change, and to reduce and to eliminate the polarization of liquid crystal molecule, thus improves ghost phenomena.
Fig. 5 is according to the process flow diagram improving the method for ghost phenomena in liquid crystal display of the present invention.First, ControlIC produces the periodic signal comprising voltage amplitude signal, time interval signal and count signal etc.As described above, voltage amplitude signal controls the size stating Gamma voltage in each cycle, the time interval during time interval signal controls each week, the quantity of count signal control cycle.Secondly, P-GammaIC receives the periodic signal that ControlIC sends, thus can export periodically variable 8CHGamma voltage as shown in Figure 4.This Gamma voltage can periodically rise when normal work stage or decline, and namely positive polarity voltage or reverse voltage can change.Finally, this periodically variable 8CHGamma voltage can be passed to display module, to improve liquid crystal molecule positive polarity in display module or negative polarity polarization, thus can avoid the liquid crystal molecule in display module that irreversible polarization occurs.To sum up, compared with Gamma voltage of the prior art, this 8CHGamma voltage can rise or decline in generating period ground, thus can reduce and eliminate the polarization of liquid crystal molecule, to reach the object improving ghost phenomena.
Above disclosedly be only present pre-ferred embodiments, certainly the interest field of the present invention can not be limited with this, one of ordinary skill in the art will appreciate that all or part of flow process realizing above-described embodiment, and according to the equivalent variations that the claims in the present invention are done, still belong to the scope that invention is contained.
Claims (10)
1. a liquid crystal display, it is characterized in that, comprise the control chip, P-GammaIC and the display module that are electrically connected to each other, described control chip exports periodic signal, and described periodic signal is passed to described P-GammaIC, make described P-GammaIC produce periodically variable Gamma voltage, described Gamma voltage is passed to described display module by described P-GammaIC, thus drives the liquid crystal molecule in described display module to deflect.
2. liquid crystal display as claimed in claim 1, it is characterized in that, described periodic signal comprises voltage amplitude signal, time interval signal and count signal, described voltage amplitude signal is for controlling the size of Gamma voltage described in each cycle, described time interval signal is for the time interval during controlling each week, and described count signal is used for the quantity of control cycle.
3. liquid crystal display as claimed in claim 2, it is characterized in that, the driving of described liquid crystal display comprises power up phase, normal work stage and power-down phase, the Gamma voltage of wherein said power up phase steadily rises, the Gamma voltage of described power-down phase steadily declines, and the Gamma voltage of described normal work stage can periodically rise or decline.
4. liquid crystal display as claimed in claim 3, is characterized in that, during normal work stage, in one-period, described P-GammaIC keeps normal and exports, and described Gamma voltage does not all change; In second period, positive polarity voltage is raised, keep reverse voltage reduction or constant simultaneously; Normal output is kept in 3rd cycle; Reverse voltage then strengthens by the 4th cycle, keeps positive polarity voltage reduction or constant simultaneously.
5. liquid crystal display as claimed in claim 4, it is characterized in that, the rising of the described Gamma voltage in normal work stage or the amplitude of decline can adjust according to the characteristic of the liquid crystal molecule in described display module.
6. liquid crystal display as claimed in claim 5, it is characterized in that, described Gamma voltage is 8 passages (CH) Gamma voltage.
7. change a method for liquid crystal display ghost phenomena, comprising:
Periodic signal is exported by control chip;
P-GammaIC receives described periodic signal, and produces periodically variable Gamma voltage, and by described Gamma voltage transmission to display module;
The described Gamma voltage of described display module receive periodic change, thus drive the liquid crystal molecule in described display module to deflect.
8. the method changing liquid crystal display ghost phenomena as claimed in claim 7, it is characterized in that, described periodic signal comprises voltage amplitude signal, time interval signal and count signal, described voltage amplitude signal is for controlling the size of Gamma voltage described in each cycle, described time interval signal is for the time interval during controlling each week, and described count signal is used for the quantity of control cycle.
9. the method changing liquid crystal display ghost phenomena as claimed in claim 8, it is characterized in that, the driving of described liquid crystal display comprises power up phase, normal work stage and power-down phase, and at described power up phase, described Gamma voltage steadily rises; In described power-down phase, described Gamma voltage steadily declines; In described normal work stage, described Gamma voltage can periodically rise or decline.
10. the method changing liquid crystal display ghost phenomena as claimed in claim 9, is characterized in that, during normal work stage, in one-period, described P-GammaIC keeps normal and exports, and described Gamma voltage does not all change; In second period, positive polarity voltage is raised, keep reverse voltage reduction or constant simultaneously; Normal output is kept in 3rd cycle; Reverse voltage then strengthens by the 4th cycle, keeps positive polarity voltage reduction or constant simultaneously.
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| CN201510870767.4A CN105355177B (en) | 2015-12-02 | 2015-12-02 | Liquid crystal display and the method for improving its ghost phenomena |
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| CN201510870767.4A CN105355177B (en) | 2015-12-02 | 2015-12-02 | Liquid crystal display and the method for improving its ghost phenomena |
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| CN105355177A true CN105355177A (en) | 2016-02-24 |
| CN105355177B CN105355177B (en) | 2018-07-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111540330A (en) * | 2020-05-26 | 2020-08-14 | Tcl华星光电技术有限公司 | Liquid crystal driving circuit, liquid crystal driving method and liquid crystal display panel |
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| CN105355177B (en) | 2018-07-03 |
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