CN104269147A - Liquid crystal display panel driving circuit and liquid crystal device - Google Patents
Liquid crystal display panel driving circuit and liquid crystal device Download PDFInfo
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- CN104269147A CN104269147A CN201410520041.3A CN201410520041A CN104269147A CN 104269147 A CN104269147 A CN 104269147A CN 201410520041 A CN201410520041 A CN 201410520041A CN 104269147 A CN104269147 A CN 104269147A
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Abstract
The invention discloses a liquid crystal display panel driving circuit and a liquid crystal device. The liquid crystal display panel driving circuit and the liquid crystal device aim to avoid the phenomenon that when a data line signal in a liquid crystal display panel changes, coupling disturbance is caused to a public electrode by the data line signal through a stray capacitor located between a data line and the public electrode, and thus horizontal crosstalk happens to the panel. According to the liquid crystal display panel driving circuit and the liquid crystal device, different public electrode compensation gains are provided for different areas on the liquid crystal display panel through a compensation circuit, and thus the probability of horizontal crosstalk can be lowered; the compensation gain control circuit conducts control by means of a gate region moving line in the panel, and thus the cost of the control circuit can be reduced.
Description
Technical field
The present invention relates to display technique field, particularly relate to a kind of liquid crystal panel drive circuit and liquid-crystal apparatus.
Background technology
Thin Film Transistor-LCD (TFT-LCD) because of its volume little, the feature such as low in energy consumption and radiationless, at current flat panel display market dominate.
Fig. 1 is a typical pixel structure of liquid crystal display.In FIG, liquid crystal capacitance Clc is take liquid crystal as medium, with the pixel electrode being distributed in array base palte side be distributed in the electric capacity that the public electrode Vcom_CF of color membrane substrates side is current-carrying plate.Storage capacitors Cs is be medium with transparent insulation material, to be distributed in the electric capacity that pixel electrode on array base palte and public electrode Vcom_TFT are current-carrying plate simultaneously.During liquid crystal display-driving, adopt the mode of lining by line scan by data writing pixel.In FIG, the sweep trace (Gate Line) of horizontal direction is used for thin film transistor (TFT) (TFT) switch of on-pixel, and the data line (Data Line) of vertical direction provides the data voltage Vp of pixel to pixel electrode by TFT switch.In the dot structure of reality, data line (Data Line) forms stray capacitance Cp1 between liquid crystal and liquid crystal capacitance; Stray capacitance Cp2 is formed between transparent insulation material and storage capacitors.
Liquid crystal display belongs to the device that alternating voltage drives.As shown in Figure 2, during liquid crystal drive, the driving voltage of data line (Data Line) meeting interval output cathode and negative polarity.When positive polarity data voltage on data line and negative polarity data voltage frequently switch, coupling can be caused via the public electrode Vcom_CF of stray capacitance Cp1 to color membrane substrates side, make public electrode Vcom_CF voltage produce ripple; Coupling can be caused via the public electrode Vcom_TFT of stray capacitance Cp2 array substrate side, make public electrode Vcom_TFT voltage produce ripple.
When public electrode voltages (Vcom_CF, Vcom_TFT) produces ripple, the tonal distortion of pixel can be caused.Fig. 3 is a background is grey, and central authorities are the detection picture of white edge.The gray shade of both sides, white edge left and right is called horizontal crosstalk, forming the factor of horizontal crosstalk is that data line (Data Line) within the scope of white edge is when positive-negative polarity voltage switching, pass through coupling capacitance, disturbance is caused to public electrode voltages signal, make public electrode voltages produce ripple, cause the pixel grey scale distortion of white edge both sides.
Summary of the invention
In view of this, for the deficiencies in the prior art, the invention provides a kind of liquid crystal panel drive circuit and liquid-crystal apparatus, the horizontal crosstalk of display device can be improved, promote display quality.
One aspect of the present invention provides a kind of liquid crystal panel drive circuit, comprising: provide different public electrode voltages for the compensating circuit by gain adjustable to zones of different on liquid crystal panel.
Further, described compensating circuit also comprises: a sign-changing amplifier; Multiple feedback resistance, connects a switch respectively, and described multiple feedback resistance parallel connection is connected across between the negative input end of described sign-changing amplifier and described output terminal.
Further, described compensating circuit also comprises an input resistance, and its one end connects an electric capacity, and the other end connects described multiple feedback resistance.
Further, an other positive input of described sign-changing amplifier connects a public electrode voltages.
The present invention provides a kind of liquid-crystal apparatus on the other hand, comprising: the liquid crystal panel drive circuit as described in any one of claim 1-4.
Another aspect of the invention provides a kind of liquid-crystal apparatus, comprise: liquid crystal panel, there is array base palte, comprise viewing area, and surround the neighboring area of described viewing area, in described viewing area, be furnished with a plurality of data lines of arranged crosswise, multi-strip scanning line and many public electrode wires, in described neighboring area, arrange described multiple feedback resistance, connect a switch respectively; Circuit board, is furnished with liquid crystal panel drive circuit, shows for driving described liquid crystal panel; Wherein, described liquid crystal panel drive circuit comprises: a sign-changing amplifier; First feedback resistance and the series connection of the second feedback resistance are connected across between the negative input end of described sign-changing amplifier and described output terminal, and described second feedback resistance is in parallel with described multiple feedback resistance.
Further, also comprise an input resistance, an electric capacity of connecting, its one end connects the negative input end of described sign-changing amplifier, and the other end is connected to feedback line, and described feedback line is across the described a plurality of data lines on described liquid crystal panel.
Further, described switch and described feedback resistance series circuit, its one end connects the negative input end of described phase inverter, and the other end connects the output terminal of described sign-changing amplifier.
Further, described switch is thin film transistor (TFT), selects described feedback resistance by the open circuit of described switch or open circuit.
Further, the grid of described thin film transistor (TFT) is connected with described sweep trace, after sweep trace input high level, opens thin film transistor switch, selects corresponding feedback resistance.
The present invention compared with prior art, its advantage is: compensating circuit provided by the invention gives different public electrode compensating gains for zones of different on liquid crystal panel, horizontal crosstalk can be improved, this compensating gain control circuit utilizes the gate regions moving-wire in panel to control, and can reduce the cost of control circuit.
Accompanying drawing explanation
Fig. 1 is the schematic equivalent circuit of liquid crystal display exemplary pixels;
Fig. 2 is the disturbance schematic diagram that data line positive-negative polarity voltage switching causes to public electrode voltages signal;
Fig. 3 is the schematic diagram of liquid-crystal apparatus display frame horizontal crosstalk;
Fig. 4 is the connection schematic diagram of compensating circuit of the present invention;
The yield value that Fig. 5 (a), 5 (b) are compensating circuit of the present invention and output voltage;
Fig. 6 is the fundamental diagram of compensating circuit of the present invention;
Fig. 7 is liquid-crystal apparatus block schematic illustration of the present invention;
The yield value that Fig. 8 (a), 8 (b) are compensating circuit provided by the invention and output voltage;
Fig. 9 is the principle of work schematic diagram of compensating circuit of the present invention;
Figure 10 is the principle of work schematic diagram of gain adjustable compensating circuit provided by the invention;
Figure 11 is the floor map of liquid-crystal apparatus of the present invention;
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further illustrated.
The present invention improves an embodiment of horizontal crosstalk for add compensating circuit for public electrode (Vcom_CF, Vcom_TFT).As shown in Figure 4, liquid crystal panel designs a feedback line (Feedback line), and is pulled out on drive circuit board S-PWB.In addition, respectively public electrode Vcom_CF and Vcom_TFT is drawn from liquid crystal panel, and be pulled out on drive circuit board S-PWB.Described feedback line is across all data lines (Data Line), because there is stray capacitance between feedback line and data line, when data line voltage changes, the voltage signal of coupling can be sent on circuit board S-PWB by feedback line Feedback.Circuit board S-PWB there is a compensating circuit, feedback line Feedback signal oppositely can be amplified and export public electrode (Vcom_CF, Vcom_TFT) to.
The output of described compensating circuit as shown in Figure 5.The yield value that Fig. 5 (a) is sign-changing amplifier is unanimously constant on described yield value each position in liquid crystal panel.Fig. 5 (b) is transferred to the output voltage of public electrode for compensating circuit, fixes the amplitude of wave form therefore exported fix due to yield value.
From the feedback signal that described compensating circuit exports, be applied to the effect of public electrode Vcom_CF as shown in Figure 6.In figure 6, Vcom_CF (S-PWB) is the reverse waveform amplification of feedback line Feedback signal, the voltage of public electrode (Vcom_CF) of being coupled with data line after this signal input panel is repealed by implication, the ripple voltage of public electrode on panel (Vcom_CF) is disappeared, thus improves horizontal crosstalk.
Compensation principle shown in Fig. 6 is only applicable to the occasion that the public electrode voltages of each location point is identical in liquid crystal panel.As shown in Figure 7, in the liquid crystal panel of reality, the ripple voltage that public electrode (Vcom_CF) is coupled, from top to bottom becomes large gradually.When applicable compensating circuit carries out countermeasure, reverse gain amplifier is fixed, therefore cannot the different from top to bottom ripple voltage of full remuneration panel, makes the limited extent that horizontal crosstalk is improved.
Fig. 7 is liquid-crystal apparatus block schematic illustration of the present invention.As shown in Figure 7, the invention provides a kind of liquid crystal panel drive circuit, it comprises the compensating circuit of public electrode current potential, is depicted as the actual wave voltage that from top to bottom public electrode is formed by data line coupling, to improve the phenomenon of the horizontal crosstalk of liquid crystal panel on the right side of panel.Described compensating circuit can along with the different degree of coupling of liquid crystal panel diverse location, corresponding compensating gain value is provided, comprehensive improve liquid crystal panel display image quality homogeneity, eliminate colour cast and horizontal crosstalk, and be built in described gain control circuit in liquid crystal panel, numerous and diverse calculation circuit can be saved and reduce circuit cost.
Above-described embodiment specifically describes as follows by reference to the accompanying drawings:
The defect that the present invention fixedly causes to improve gain amplifier in compensating circuit, adds gain control circuit unit.Described gain control circuit unit increases gradually along with compensating gain when liquid crystal panel from top to bottom scans, to offset the ripple voltage of liquid crystal panel from top to bottom different size.As shown in Fig. 8 (a), adopt compensating circuit provided by the invention, the yield value of sign-changing amplifier increases gradually, and the amplitude of wave form of the output voltage correspondingly as shown in Fig. 8 (b) also can increase gradually.
In order to realize yield value as shown in Figure 8 and output voltage.The invention provides a kind of compensating circuit of the gain adjustable improved on compensating circuit basis as shown in Figure 9.The compensating circuit of gain adjustable provides different public electrode voltages to zones of different on liquid crystal panel.Described compensating circuit also comprises: a sign-changing amplifier; Multiple feedback resistance, connects a switch respectively, and described multiple feedback resistance parallel connection is connected across between the negative input end of described sign-changing amplifier and described output terminal.
Further, described compensating circuit also comprises an input resistance, and its one end connects an electric capacity, and the other end connects described multiple feedback resistance.Further, an other positive input of described sign-changing amplifier connects a public electrode voltages.
Particularly, the compensating circuit shown in Fig. 9 is a sign-changing amplifier, and VI is the input voltage of feedback line Feedback, and VO is the output voltage of compensating circuit, and its output function is:
VO＝-(RN/Rf)xVI+Vcom_DC
Corresponding output gain value is: RN/Rf.By adjustment yield value RN/Rf, the amplitude of output waveform can be changed.
The compensating circuit of the gain adjustable that the compensating circuit basis shown in Fig. 9 is improved as shown in Figure 10.In Fig. 10, compare compensating circuit as shown in Figure 9, add N number of switch and N number of gain resistor Rn (n=1 ~ N).The output function of the compensating circuit of gain adjustable is as shown in Figure 10:
VO＝-(Rn/Rf)xVI+Vcom_DC
Corresponding output gain value is: Rn/Rf.Select different gain resistor Rn by switch selectable, thus realize different gain amplifiers.
As an embodiment, present invention also offers a kind of liquid-crystal apparatus, comprising: above-mentioned liquid crystal panel drive circuit.
As shown in figure 11, another aspect of the invention provides a kind of liquid-crystal apparatus, comprise: liquid crystal panel, there is array base palte, comprise viewing area, and surround the neighboring area of described viewing area, the a plurality of data lines of arranged crosswise, multi-strip scanning line and many public electrode wires are furnished with in described viewing area, in described neighboring area, arrange described multiple feedback resistance, connect a switch respectively; Circuit board, is furnished with liquid crystal panel drive circuit, shows for driving described liquid crystal panel; Wherein, described liquid crystal panel drive circuit comprises: a sign-changing amplifier; First feedback resistance and the series connection of the second feedback resistance are connected across between the negative input end of described sign-changing amplifier and described output terminal, and described second feedback resistance is in parallel with described multiple feedback resistance.
Wherein, also comprise an input resistance, an electric capacity of connecting, its one end connects the negative input end of described sign-changing amplifier, and the other end is connected to feedback line, and described feedback line is across the described a plurality of data lines on described liquid crystal panel.Described switch and described feedback resistance series circuit, its one end connects the negative input end of described phase inverter, and the other end connects the output terminal of described sign-changing amplifier.Preferably, described switch is thin film transistor (TFT), selects described feedback resistance by the open circuit of described switch or open circuit.
Further, the grid of described thin film transistor (TFT) is connected with described sweep trace, after sweep trace input high level, opens thin film transistor switch, selects corresponding feedback resistance.
Use the compensating circuit of gain adjustable provided by the invention, gain control switch is arranged in the drives structure on liquid crystal panel.In fig. 11, ride gain adjustment switch is carried out by sweep trace (Gate Line).Be the timing waveform of each bar sweep trace (Gate Line) on the right side of Figure 11, output function is:
VO＝-(Rn/Rf)xVI+Vcom_DC
Output function corresponding to each sequential is as follows:
T0:Gain＝(RA+RB)/Rf
T1:Gain＝(RA+RB//RC)/Rf
T2:Gain＝(RA+RB//2RC)/Rf
T3:Gain＝(RA+RB//3RC)/Rf
By regulating RA, RB, RC, Rf, the characteristic of collocation liquid crystal panel, exports the gain variation curve be applicable to.
The defect that the present invention fixedly causes to improve gain amplifier in compensating circuit, adds gain control circuit unit.Described gain control circuit unit increases gradually along with compensating gain when liquid crystal panel from top to bottom scans, to offset the ripple voltage of liquid crystal panel from top to bottom different size.
Compensating circuit provided by the invention gives different public electrode compensating gains for zones of different on liquid crystal panel, can improve horizontal crosstalk, and this compensating gain control circuit utilizes the gate regions moving-wire in panel to control, and can reduce the cost of control circuit.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple equivalents to technical scheme of the present invention, these equivalents all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
Claims (10)
1. a liquid crystal panel drive circuit, comprising: provide different public electrode voltages for the compensating circuit by gain adjustable to zones of different on liquid crystal panel.
2. according to claim 1, it is characterized in that: described compensating circuit also comprises:
One sign-changing amplifier;
Multiple feedback resistance, connects a switch respectively, and described multiple feedback resistance parallel connection is connected across between the negative input end of described sign-changing amplifier and described output terminal.
3. liquid crystal panel drive circuit according to claim 2, is characterized in that: described compensating circuit also comprises an input resistance, and its one end connects an electric capacity, and the other end connects described multiple feedback resistance.
4. liquid crystal panel drive circuit according to claim 3, is characterized in that: an other positive input of described sign-changing amplifier connects a public electrode voltages.
5. a liquid-crystal apparatus, comprising: the liquid crystal panel drive circuit as described in any one of claim 1-4.
6. a liquid-crystal apparatus, comprising:
Liquid crystal panel, there is array base palte, comprise viewing area, and surround the neighboring area of described viewing area, the a plurality of data lines of arranged crosswise, multi-strip scanning line and many public electrode wires are furnished with in described viewing area, in described neighboring area, arrange described multiple feedback resistance, connect a switch respectively;
Circuit board, is furnished with liquid crystal panel drive circuit, shows for driving described liquid crystal panel;
Wherein, described liquid crystal panel drive circuit comprises: a sign-changing amplifier; First feedback resistance and the series connection of the second feedback resistance are connected across between the negative input end of described sign-changing amplifier and described output terminal, and described second feedback resistance is in parallel with described multiple feedback resistance.
7. liquid-crystal apparatus according to claim 6, it is characterized in that: also comprise an input resistance, an electric capacity of connecting, its one end connects the negative input end of described sign-changing amplifier, the other end is connected to feedback line, and described feedback line is across the described a plurality of data lines on described liquid crystal panel.
8. liquid-crystal apparatus according to claim 6, is characterized in that: described switch and described feedback resistance series circuit, its one end connects the negative input end of described phase inverter, and the other end connects the output terminal of described sign-changing amplifier.
9. liquid-crystal apparatus according to claim 6, is characterized in that: described switch is thin film transistor (TFT), selects described feedback resistance by the open circuit of described switch or open circuit.
10. liquid-crystal apparatus according to claim 8, is characterized in that: the grid of described thin film transistor (TFT) is connected with described sweep trace, after sweep trace input high level, opens thin film transistor switch, selects corresponding feedback resistance.
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| CN201410520041.3A CN104269147A (en) | 2014-09-30 | 2014-09-30 | Liquid crystal display panel driving circuit and liquid crystal device |
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| CN201410520041.3A CN104269147A (en) | 2014-09-30 | 2014-09-30 | Liquid crystal display panel driving circuit and liquid crystal device |
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| CN107230457A (en) * | 2017-05-19 | 2017-10-03 | 南京中电熊猫液晶显示科技有限公司 | The compensation circuit of liquid crystal display panel |
| CN107481686A (en) * | 2017-08-21 | 2017-12-15 | 武汉华星光电技术有限公司 | Method for improving display state of liquid crystal panel, liquid crystal panel and liquid crystal display |
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| CN108133690A (en) * | 2016-12-01 | 2018-06-08 | 元太科技工业股份有限公司 | Electrophoretic display device |
| WO2018126721A1 (en) * | 2017-01-03 | 2018-07-12 | 京东方科技集团股份有限公司 | Display panel and method for compensating common voltage thereof, and display device |
| CN108873423A (en) * | 2018-09-21 | 2018-11-23 | 深圳市华星光电技术有限公司 | A kind of liquid crystal display panel and its driving method |
| CN113409740A (en) * | 2020-03-17 | 2021-09-17 | 凌巨科技股份有限公司 | Voltage compensation circuit of liquid crystal display device and method thereof |
| CN114280854A (en) * | 2021-12-17 | 2022-04-05 | 惠科股份有限公司 | Display panel and display |
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Application publication date: 20150107 |