CN102708813A - Liquid crystal display device and liquid crystal display method - Google Patents
Liquid crystal display device and liquid crystal display method Download PDFInfo
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- CN102708813A CN102708813A CN2011101227856A CN201110122785A CN102708813A CN 102708813 A CN102708813 A CN 102708813A CN 2011101227856 A CN2011101227856 A CN 2011101227856A CN 201110122785 A CN201110122785 A CN 201110122785A CN 102708813 A CN102708813 A CN 102708813A
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Abstract
The embodiment of the invention provides a liquid crystal display device and a liquid crystal display method. The liquid crystal display device comprises a control signal generator, a data driver and a gamma voltage generator connected with the data driver, wherein the control signal generator is used for sending a data control signal to the data driver, and the data driver converts a red, green and blue (RGB) signal into analog data voltage; and under a black frame insertion driving mode, the gamma voltage generator sends black frame insertion driving mode gamma voltage to the data driver and corrects the converted analog data voltage. Due to the liquid crystal display device and the liquid crystal display method, defects of the reduction of the display brightness, which is caused by black frame insertion, and deterioration of a gamma characteristic, which is caused by the reduction of the brightness, are overcome.
Description
Technical field
The present invention relates to field of liquid crystal display, relate in particular to a kind of liquid crystal indicator and liquid crystal display method.
Background technology
Traditional cathode ray tube (CRT) display relies on the phosphor powder on the cathode-ray tube (CRT) emitting electrons bump screen to come display image, but the principle of liquid crystal display then is far from it.Usually, liquid crystal display (LCD) device has upper substrate and infrabasal plate, have each other certain intervals and mutually over against, be formed on two substrates a plurality of electrodes each other over against.The liquid crystal board that contains liquid crystal molecule is clipped between upper substrate and the following basic meal.Voltage is applied on the liquid crystal panel through the electrode on the substrate, thereby changes the arrangement display image of liquid crystal molecule according to the voltage that is acted on then.Liquid crystal panel itself is not luminous; So liquid crystal indicator has the backlight that is positioned at behind the liquid crystal panel; Thereby the arrangement according to liquid crystal molecule is controlled from backlight quantity of incident light display image, and liquid crystal molecule is the material with refractive index and dielectric constant anisotropy.Between two polaroids of liquid crystal indicator, accompany glass substrate, colored filter, electrode, liquid crystal layer and transistor film.The light process that backlight sends is polaroid down, becomes the polarized light with certain polarization direction.Institute's making alive between the transistor controls electrode; And this voltage acts on the polarization direction that liquid crystal panel is controlled polarized light; Polarized light forms monochromatic polarized light after seeing through corresponding color film chromatograph, if polarized light can penetrate the upper strata polaroid, then demonstrates corresponding color; Electric field intensity is different, and the deflection angle of liquid crystal molecule is also different, and the light intensity that sees through is different, and the brightness of demonstration is also different.At last, liquid crystal indicator shows motley image through the combination of the different light intensity of three kinds of colors of RGB.
Fig. 1 is an optical density time history plot in the existing LCD device, and the LCD device is the demonstration of stable state type among the figure.When showing a width of cloth picture, each liquid crystal molecule all has specific separately angle on the liquid crystal panel, only if receive the signal of picture conversion, liquid crystal molecule can kept the state of previous frame picture always.The pattern of this " stable state " in the benefit of bringing picture can not occur glimmering, also is the core reasons that smear produces.Reversing and restoring of liquid crystal molecule angle all needs the regular hour, and the response time is long more, and then the smear phenomenon is serious more.
(Black Frame Insertion, BFI) technology just is being based on the theory of pulsed to black plug, has simulated the principle of CRT monitor, between per two frame videos, inserts the black full picture of a frame, makes the output of picture become pulsed, and is doubled frame per second.Fig. 2 is illustrated in data voltage time history plot in the impulse type LCD device.As shown in Figure 2, a frame display cycle was divided between demonstration time period that shows ideal image and the non-display area that shows black picture.Desirable data voltage V1 is provided showing in the time period, the black plug data voltage V2 that shows black picture was provided in the non-demonstration time period, the impulse type through this discontinuous variation shows and prevents the motion blur phenomenon.
Fig. 3 is the structural drawing of above-mentioned impulse type LCD device.On the one hand, the control signal generator in the time schedule controller produces and is used for control gate driver and the control signal that is used for the driving data driver.Wherein, to be used for the control data driver be analog data voltage with RGB (red, green, blue) conversion of signals to the data controlling signal of generation.And the grid control signal that produces makes gate drivers apply signal to liquid crystal panel.Data driver converts red, green, blue (rgb signal) into analog data voltage, and this aanalogvoltage is proofreaied and correct by the gamma electric voltage that is produced in the gamma electric voltage maker.On the other hand; Black data generator in the time schedule controller provides the black plug data-signal in the non-demonstration time period; Be sent to data driver, data driver also can convert the black plug data-signal into analog data voltage, just is presented at this moment to be blank screen on the liquid crystal panel.
In impulse type LCD device; Because non-demonstration time period and the continuous switching that shows the time period in the black plug drive pattern; Make human eye can feel the significantly change of the display brightness that brings thus, the appearance of gamma bias voltage in addition makes the gamma characteristic generation deterioration of display brightness.
Summary of the invention
In order to make the display effect that improves under the black plug drive pattern, the embodiment of the invention provides a kind of LCD, the gamma electric voltage maker that comprises control signal generator, data driver and link to each other with said data driver; Wherein, the control signal generator is used for sending data controlling signal to said data driver, makes said data driver convert rgb signal into analog data voltage; The gamma electric voltage maker is used under the black plug drive pattern, sends black plug drive pattern gamma electric voltage to said data driver, and the analog data voltage of said conversion is proofreaied and correct.
Further, the gamma electric voltage maker is further used for, and receives the drive pattern control signal, according to said drive pattern control signal, produces corresponding said black plug drive pattern gamma electric voltage; Said drive pattern control signal is used to indicate said liquid crystal indicator to be in common drive pattern or is in the black plug drive pattern.
Further, said liquid crystal indicator further comprises the drive pattern selector switch, is used to receive the user and is provided with, and according to said user the said drive pattern control signal of generation is set.
More excellent, black plug drive pattern gamma electric voltage is one group, for having increased the gamma bias voltage at common drive pattern gamma electric voltage.
More excellent, saidly increased the gamma bias voltage at common drive pattern gamma electric voltage and do, outside the gamma electric voltage first and group tail, increased the gamma bias voltage than common drive pattern gamma electric voltage except that group.
The embodiment of the invention provides a kind of liquid crystal display method simultaneously, and data driver receives the data controlling signal of control signal generator, converts rgb signal into analog data voltage; Wherein,
Gamma electric voltage producer sends black plug drive pattern gamma electric voltage to said data driver under the black plug drive pattern, the analog data voltage of said conversion is proofreaied and correct.
Further, above-mentioned liquid crystal display method comprises that also said gamma electric voltage producer receives the drive pattern control signal, and said drive pattern control signal indication gamma electric voltage producer is in common drive pattern or black plug drive pattern.
Further, said method also comprises, receives the user and is provided with, and according to said user the said drive pattern control signal of generation is set, and said drive pattern control signal is sent to said gamma electric voltage producer.
More excellent; Said gamma electric voltage producer sends black plug drive pattern gamma electric voltage to said data driver and is specially under the black plug drive pattern, and said gamma electric voltage producer is under the black plug drive pattern; Produce said black plug drive pattern gamma electric voltage; Wherein, said black plug drive pattern gamma electric voltage is one group, for having increased the gamma bias voltage at common drive pattern gamma electric voltage.
More excellent, saidly increased the gamma bias voltage at common drive pattern gamma electric voltage and be specially, first and group tail, increased the gamma bias voltage than common drive pattern gamma electric voltage except that group.
Through above-mentioned liquid crystal indicator and method; Make that the gamma electric voltage maker can be on the basis of the gamma electric voltage that common drive pattern generates under the black plug drive pattern; The corresponding bias voltage that increases; Improved the reduction of the display brightness that causes owing to black plug, and because brightness reduces the deterioration of the gamma characteristic that causes.Further, through the drive pattern control signal, make the gamma electric voltage maker to be directed against two kinds of drive patterns respectively, generate corresponding gamma electric voltage, more can satisfy user's different demands.
Description of drawings
Fig. 1 is an optical density time history plot in the LCD device in the prior art.
Fig. 2 is an impulse type LCD device data voltage time history plot in the prior art.
Fig. 3 is an impulse type LCD apparatus structure synoptic diagram in the prior art.
The impulse type LCD apparatus structure synoptic diagram that Fig. 4 provides for one embodiment of the invention.
The bias voltage structural representation of the gamma electric voltage maker that Fig. 5 provides for one embodiment of the invention.
Embodiment
The invention provides a kind of liquid crystal indicator, the gamma electric voltage maker that comprises control signal generator, data driver and link to each other with said data driver;
Said control signal generator is used for sending data controlling signal to said data driver, makes said data driver convert rgb signal into analog data voltage;
Wherein, said gamma electric voltage maker is used under the black plug drive pattern, sends black plug drive pattern gamma electric voltage to said data driver, and the analog data voltage of said conversion is proofreaied and correct.
In the common drive pattern, gamma electric voltage is generally one group, is example (situation that one group of 16 gamma electric voltage is also arranged) with one group 14 at present, and the gamma electric voltage maker passes through the serial resistance dividing potential drop by a plurality of resistance in seriess to reference voltage source V, generates gamma electric voltage V1～V14.
More excellent scheme is, keeps V1 and V14 in the common drive pattern constant, to V2～V13 adjustment of setovering, promptly exports Vn+ Δ Vn, and n=213 wherein is as one group of black plug drive pattern gamma electric voltage.Make so at first is to have little effect because of the improvement of the voltage end to end that changes the gamma electric voltage group to image quality; And on the other hand, being omitted in increases bias voltage on the voltage end to end, can reduce the increase of the consumed power that bias voltage causes.
In one group of gamma electric voltage of common drive pattern; Suppose that V3 is added in the analog data voltage that enables to export 3V on the data driver; When changing to the analog data voltage of 5V by the 3V analog data voltage; Owing to the liquid crystal response velocity effect, possibly finally can only demonstrate the effect of 4.5V analog data voltage; If add Δ V3 on the V3 this moment, that is to say from 3V and change to 6V through changing analog data voltage, just can reach the display effect of 5V, and the arrangement speed of liquid crystal molecule can be reduced to 1.5ms by original 2ms.Like this; Through the adjustment of Δ Vn bias voltage, not only make the Liquid Crystal Molecules Alignment corresponding shortening of required time that puts in place, and can improve under the black plug drive pattern; Because the reduction and the image quality reduction of brightness, and since the gamma electric voltage that the gamma electric voltage maker produces to the bad influence of the change of image quality.
The appearance of impulse type LCD technology is to be solution smear phenomenon, yet because the appearance of black plug data but possibly cause the influence of the change of display brightness to display effect.So the user is less than the requirement of the change of display brightness to the requirement of smear phenomenon sometimes, perhaps the smear phenomenon of some video image and not serious causes to be used for hoping to use common drive pattern, but not the black plug drive pattern.To this kind demand, the present invention provides a kind of can select drive pattern by the user, according to the drive pattern control signal of the different drive pattern of expression, produces the liquid crystal display method of corresponding gamma electric voltage.
Fig. 4 has represented the block scheme of LCD device of the impulse type of the present invention's one preferred embodiment.Wherein, Time schedule controller includes black data generator and control signal generator; Control signal generator wherein sends grid control signal and data controlling signal (seeing that from the outside of time schedule controller promptly these two kinds of control signals are sent by time schedule controller) respectively to gate drivers and data driver; The drive pattern selector switch sends the drive pattern control signal to the gamma electric voltage maker; The gamma electric voltage maker links to each other with data driver, and the analog data signal after data driver will transform and proofread and correct flows to liquid crystal panel.
Time schedule controller can produce synchronizing signal, like clock signal, horizontal-drive signal, vertical synchronizing signal and data enable signal, and the RGB video data.From the RGB data of external series or parallel input,, be transferred to data driver after being redistributed through the redistribution of the data in time schedule controller device (not shown among Fig. 4).The control signal generator produces the grid control signal that is used to control grid according to synchronizing signal, for example can comprise grid shift pulse signal, gate clock signal and grid output enable signal.Data controlling signal comprises source electrode shift pulse, source electrode clock signal, source electrode output enable signal and polarity inversion signal.The black data generator produces the data of black plug, when display device is in the black plug data driven mode, in the non-demonstration time period in a frame period, black data is provided.
Gate drivers response grid control signal, and generation imposes on the gate drive signal of the gate line on the liquid crystal panel in proper order.
Data driver (also being source electrode driver) response data control signal, and data-signal is converted into analog data voltage according to gamma electric voltage, order imposes on the driving voltage of the data line on the liquid crystal panel.
In the present embodiment, the drive pattern selector switch is a separate unit, and the drive pattern that receives external user is selected signal, analyzes and should select signal, confirms that the user has selected one of them in normal driving mode and the black plug drive pattern.As shown in Figure 5; MS is the drive pattern control signal; When its indication was common drive pattern at present, it (was source electrode driver, because of converting rgb signal into analog data signal that driven gamma electric voltage (being the gamma electric voltage under the common drive pattern) exports data driver to; So be digital to analog converter sign directly among the figure with DAC), and do not have the bias voltage addition of black plug data.When the MS indication was the black plug drive pattern at present, V1～V14 is last can to load bias voltage Δ V1～Δ V14 respectively, formed gamma electric voltage V1+ Δ V1, V2+ Δ V2, V3+ Δ V3......V13+ Δ V13 and V14+ Δ V14 under the black plug drive pattern.
Mention at aforesaid preferred embodiment embodiment; In one group of black plug drive pattern gamma electric voltage; Make V1 and V14 still produce black plug voltage; Bias voltage Δ V2～Δ V13 be can add respectively on V2～V13, gamma electric voltage V1, V2+ Δ V2, V3+ Δ V3......V13+ Δ V13 and V14 under the black plug drive pattern formed.And whether omit the loading bias voltage at head and the tail, and on other gamma electric voltages except that head and the tail, load bias voltage, need according to the result who whether image quality is had improvement.
The drive pattern selector switch can be separate unit, promptly is provided with and receives the drive pattern selection signal that the user selects separately; Also can be arranged in the time schedule controller, the drive pattern that is received the representative of consumer selection result by the control signal generator is selected signal, generates the drive pattern control signal, provides the indication of drive pattern to the gamma electric voltage maker.
The present invention also provides a kind of liquid crystal display method embodiment, and data driver receives the data controlling signal of control signal generator, converts rgb signal into analog data voltage;
Gamma electric voltage producer sends black plug drive pattern gamma electric voltage to said data driver under the black plug drive pattern, the analog data voltage of said conversion is proofreaied and correct.
Wherein, the black plug drive pattern gamma electric voltage that gamma electric voltage producer produces is one group, outside the gamma electric voltage except that group head and group tail, has increased the gamma bias voltage than common drive pattern gamma electric voltage.Such as when one group of gamma electric voltage is 14, can add bias voltage Δ V1～Δ V14 respectively on V1～V14, form black plug drive pattern gamma electric voltage V1, V2+ Δ V2, V3+ Δ V3......V13+ Δ V13 and V14.More excellent scheme is that V1 and V14 still produce black plug voltage, and can add bias voltage Δ V2～Δ V13 respectively on V2～V13.
Concrete definite method about Δ Vn; When needed analog drive voltage during Vn; Through on Vn, increasing different Δ Vn voltage, to measure again when other analog drive voltage are altered to Vn, Liquid Crystal Molecules Alignment changes the required real time; When this time shortened to the smear phenomenon that can eliminate when showing, this Δ Vn just can confirm.
Among a kind of more excellent embodiment, gamma electric voltage producer receives the drive pattern control signal, and this drive pattern control signal indication gamma electric voltage producer is in common drive pattern or black plug drive pattern.
And the drive pattern that the drive pattern control signal generates when being provided with by the user selects signal identification back to generate; The user is less than the requirement of the change of display brightness to the requirement of smear phenomenon; When perhaps the smear phenomenon of some video image is also not serious; The user can satisfy different user's requests flexibly according among the option of common drive pattern and black plug drive pattern, selecting the former.Perhaps, dispatch from the factory acquiescence or be defaulted as wherein a kind of drive pattern when using first of liquid crystal indicator if the user does not do change, promptly is defaulted as the user and is set to this kind drive pattern.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (10)
1. liquid crystal indicator, the gamma electric voltage maker that comprises control signal generator, data driver and link to each other with said data driver;
Said control signal generator is used for sending data controlling signal to said data driver, makes said data driver convert rgb signal into analog data voltage;
It is characterized in that said gamma electric voltage maker is used under the black plug drive pattern, send black plug drive pattern gamma electric voltage, the analog data voltage of said conversion is proofreaied and correct to said data driver.
2. liquid crystal indicator as claimed in claim 1 is characterized in that, said gamma electric voltage maker is further used for, and receives the drive pattern control signal, according to said drive pattern control signal, produces corresponding said black plug drive pattern gamma electric voltage; Said drive pattern control signal is used to indicate said liquid crystal indicator to be in common drive pattern or is in the black plug drive pattern.
3. liquid crystal indicator as claimed in claim 2 is characterized in that said liquid crystal indicator further comprises the drive pattern selector switch, is used to receive the user and is provided with, and according to said user the said drive pattern control signal of generation is set.
4. like each described liquid crystal indicator of claim 1～3, it is characterized in that said black plug drive pattern gamma electric voltage is one group, for having increased the gamma bias voltage at common drive pattern gamma electric voltage.
5. liquid crystal indicator as claimed in claim 4; It is characterized in that; Saidly increased the gamma bias voltage at common drive pattern gamma electric voltage and do, outside the gamma electric voltage first and group tail, increased the gamma bias voltage than common drive pattern gamma electric voltage except that group.
6. liquid crystal display method, data driver receives the data controlling signal of control signal generator, converts rgb signal into analog data voltage; It is characterized in that,
Gamma electric voltage producer sends black plug drive pattern gamma electric voltage to said data driver under the black plug drive pattern, the analog data voltage of said conversion is proofreaied and correct.
7. liquid crystal display method as claimed in claim 6; It is characterized in that; Said method comprises that further said gamma electric voltage producer receives the drive pattern control signal, and said drive pattern control signal indication gamma electric voltage producer is in common drive pattern or black plug drive pattern.
8. liquid crystal display method as claimed in claim 7; It is characterized in that said method further comprises, receives the user and is provided with; And be provided with according to said user and generate said drive pattern control signal, said drive pattern control signal is sent to said gamma electric voltage producer.
9. like each described liquid crystal display method of claim 6～8, it is characterized in that said gamma electric voltage producer is under the black plug drive pattern; Sending black plug drive pattern gamma electric voltage to said data driver is specially; Said gamma electric voltage producer produces said black plug drive pattern gamma electric voltage, wherein under the black plug drive pattern; Said black plug drive pattern gamma electric voltage is one group, for having increased the gamma bias voltage at common drive pattern gamma electric voltage.
10. liquid crystal display method as claimed in claim 9 is characterized in that, has saidly increased the gamma bias voltage at common drive pattern gamma electric voltage and is specially, and first and group tail except that group, has increased the gamma bias voltage than common drive pattern gamma electric voltage.
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| CN103151005A (en) * | 2013-01-31 | 2013-06-12 | 南京中电熊猫液晶显示科技有限公司 | Driving method of liquid crystal display |
| CN104021760A (en) * | 2014-05-30 | 2014-09-03 | 京东方科技集团股份有限公司 | Adjusting method of gamma voltage for OLED displaying device |
| WO2016197408A1 (en) * | 2015-06-08 | 2016-12-15 | 深圳市华星光电技术有限公司 | Display device capable of performing black frame insertion |
| CN106448610A (en) * | 2016-12-13 | 2017-02-22 | 中航华东光电有限公司 | Method for solving color shift of liquid crystal display screen under low-brightness signal condition |
| WO2017067020A1 (en) * | 2015-10-23 | 2017-04-27 | 深圳市华星光电技术有限公司 | Display device and method for driving same |
| CN110164393A (en) * | 2019-05-08 | 2019-08-23 | 昆山龙腾光电有限公司 | A kind of display driver circuit and display methods |
| CN110910851A (en) * | 2019-12-18 | 2020-03-24 | 京东方科技集团股份有限公司 | Source electrode driving circuit, driving method and display device |
| CN112750399A (en) * | 2020-12-31 | 2021-05-04 | 上海天马有机发光显示技术有限公司 | Display panel driving method and device, display device, equipment and storage medium |
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| CN103151005A (en) * | 2013-01-31 | 2013-06-12 | 南京中电熊猫液晶显示科技有限公司 | Driving method of liquid crystal display |
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| CN110164393A (en) * | 2019-05-08 | 2019-08-23 | 昆山龙腾光电有限公司 | A kind of display driver circuit and display methods |
| CN110164393B (en) * | 2019-05-08 | 2021-11-16 | 昆山龙腾光电股份有限公司 | Display driving circuit and display method |
| CN110910851A (en) * | 2019-12-18 | 2020-03-24 | 京东方科技集团股份有限公司 | Source electrode driving circuit, driving method and display device |
| CN110910851B (en) * | 2019-12-18 | 2021-08-03 | 京东方科技集团股份有限公司 | Source electrode driving circuit, driving method and display device |
| CN112750399A (en) * | 2020-12-31 | 2021-05-04 | 上海天马有机发光显示技术有限公司 | Display panel driving method and device, display device, equipment and storage medium |
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Application publication date: 20121003 |