CN203179487U - Liquid crystal display apparatus - Google Patents
Liquid crystal display apparatus Download PDFInfo
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- CN203179487U CN203179487U CN 201320145567 CN201320145567U CN203179487U CN 203179487 U CN203179487 U CN 203179487U CN 201320145567 CN201320145567 CN 201320145567 CN 201320145567 U CN201320145567 U CN 201320145567U CN 203179487 U CN203179487 U CN 203179487U
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 25
- 230000000630 rising effect Effects 0.000 claims abstract description 14
- 239000004065 semiconductor Substances 0.000 claims description 53
- 239000010409 thin film Substances 0.000 claims description 25
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 description 7
- 230000000087 stabilizing effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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Abstract
The utility model discloses a liquid crystal display apparatus. The liquid crystal display apparatus comprises a pixel unit, a data line, a scanning driver, a cutting angle circuit and a scanning line, wherein the data line is used to transmit a data driving signal to the pixel unit; the scanning driver is used to generate a scanning driving signal; the cutting angle circuit is connected with the scanning driver and carries out cutting angle on a rising edge of the scanning driving signal; the scanning line is used to transmit the scanning driving signal after the cutting angle to the pixel unit. Through the above mode, by using the apparatus of the utility model, a difference of a voltage transmitted to a pixel electrode can be reduced and a color deviation phenomenon is eliminated so that display quality of the liquid crystal display apparatus is increased.
Description
Technical field
The utility model relates to the display technique field, particularly relates to a kind of liquid crystal indicator.
Background technology
See also Fig. 1, Fig. 1 imports with the scanning drive signal of delegation's pixel cell and the oscillogram of data drive signal in the prior art.As shown in Figure 1, at thin-film transistor LCD device (Thin Film Transistor-Liquid Crystal Display, TFT-LCD) in, sweep trace is used for transmission scanning drive signal Gate to thin film transistor (TFT), to open thin film transistor (TFT), data line is used for when thin film transistor (TFT) is opened transmission data drive signal Data to pixel cell Pix, with to pixel cell Pix charging, thereby controls the demonstration of pixel cell Pix.Wherein, pixel cell Pix is Show Color R(redness respectively, Red), the G(green, and Green) and the B(blueness, Blue).
In the liquid crystal indicator of prior art, scanning drive signal Gate is because the influence of resistance and electric capacity, makes to produce delay phenomenon when changing to noble potential by electronegative potential.As shown in Figure 1, the waveform perfection of the scanning drive signal Gate of the more previous input of waveform of the scanning drive signal Gate of back input, thereby the waveform that causes the data-signal Data of the pixel cell Pix that is input to color R as shown in Figure 1 is input to the waveform perfection of data-signal Data of the pixel cell Pix of color G, so it is higher to be input to the voltage of pixel cell Pix of color R.Therefore, it is inhomogeneous to cause under the colour mixture picture color R and color G to show, wherein, the phenomenon that color R can highlight has a strong impact on the display quality of TFT-LCD.
The utility model content
The technical matters that the utility model mainly solves provides a kind of liquid crystal indicator, can reduce the voltage differences that is transferred to pixel electrode, eliminates color offset phenomenon, thereby improves the display quality of liquid crystal indicator.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of liquid crystal indicator is provided, and this liquid crystal indicator comprises: pixel cell; Data line is used for the transmission data drive signal to pixel cell; Scanner driver is for generation of scanning drive signal; The top rake circuit is connected with scanner driver, and the top rake circuit carries out top rake to the rising edge of scanning drive signal; Sweep trace is used for the scanning drive signal behind the top rake is transferred to pixel cell.
Wherein, pixel cell comprises thin film transistor (TFT) and pixel electrode, thin film transistor (TFT) comprises grid, source electrode and drain electrode, pixel electrode connects drain electrode, sweep trace connects grid, so that the scanning drive signal behind the top rake is transferred to grid, and then the conducting of control thin film transistor (TFT), data line connects source electrode, with when the thin film transistor (TFT) conducting through source electrode transmission data drive signal to pixel electrode.
Wherein, the top rake circuit further carries out top rake to the negative edge of scanning drive signal.
Wherein, the top rake circuit comprises the first N-type metal-oxide-semiconductor, the second N-type metal-oxide-semiconductor, P type metal-oxide-semiconductor, first resistance, second resistance, the 3rd resistance, RC circuit and first electric capacity, wherein, the grid of the first N-type metal-oxide-semiconductor receives scanning drive signal, the source ground of the first N-type metal-oxide-semiconductor, the drain electrode of the first N-type metal-oxide-semiconductor is connected the source electrode of P type metal-oxide-semiconductor through first resistance and second resistance, and reception reference voltage signal, the grid of P type metal-oxide-semiconductor is connected between first resistance and second resistance, the drain electrode of P type metal-oxide-semiconductor connects sweep trace, the source ground of the second N-type metal-oxide-semiconductor, the grid of the second N-type metal-oxide-semiconductor connects the inversion signal of scanning drive signal, the drain electrode of the second N-type metal-oxide-semiconductor is connected to the drain electrode of P type metal-oxide-semiconductor through the 3rd resistance, first end of RC circuit and first end of first electric capacity are connected between the connected node and sweep trace of the drain electrode of P type metal-oxide-semiconductor and the 3rd resistance, the second end ground connection of second end of RC circuit and first electric capacity.
Wherein, the RC circuit comprises that series connection arranges second electric capacity and the 4th resistance.
The beneficial effects of the utility model are: the situation that is different from prior art, liquid crystal indicator of the present utility model is by carrying out top rake with the top rake circuit to the rising edge of scanning drive signal, scanning drive signal after utilizing sweep trace with top rake then transfers to pixel cell, make that the voltage of importing the data drive signal in each pixel cell is close or equal, the brightness that has guaranteed the color that each pixel cell shows is close or identical, thereby reduced color offset phenomenon, improved the display quality of display device.
Description of drawings
Fig. 1 imports with the scanning drive signal of delegation's pixel cell and the oscillogram of data drive signal in the prior art;
Fig. 2 is the structural representation of a kind of liquid crystal indicator of the utility model first embodiment;
Fig. 3 is the circuit diagram of top rake circuit of the present utility model;
Fig. 4 is the oscillogram of the signal of top rake circuit reception of the present utility model and output;
Fig. 5 is the oscillogram of the scanning drive signal behind the top rake of the present utility model;
Fig. 6 is the process flow diagram of driving method of a kind of liquid crystal indicator of the utility model second embodiment.
Embodiment
See also Fig. 2, Fig. 2 is the structural representation of a kind of liquid crystal indicator of the utility model first embodiment.As shown in Figure 2, liquid crystal indicator 20 of the present utility model comprises a plurality of pixel cells 21, scanner driver 22, top rake circuit 23, data driver 24, multi-strip scanning line A and many data line C.Wherein, data driver 24 is for generation of data drive signal.Data line C is connected with data driver 24, is used for this data drive signal of transmission to pixel cell 21.Scanner driver 22 is for generation of scanning drive signal.Top rake circuit 23 is connected with scanner driver 22, and the rising edge of 23 pairs of scanning drive signal of top rake circuit carries out top rake.Sweep trace A connects top rake circuit 23, is used for the scanning drive signal behind the top rake is transferred to pixel cell 21.
In order to eliminate horizontal influence between two adjacent unit pixel 21, the top rake circuit 23 of present embodiment further carries out top rake to the negative edge of scanning drive signal.
Particularly, pixel cell 21 comprises thin film transistor (TFT) T and pixel electrode P, and thin film transistor (TFT) T comprises grid G 0, source S 0 and drain D 0.Wherein, pixel electrode P connects drain D 0, sweep trace A connects grid G 0, so that the scanning drive signal behind the top rake is transferred to grid G 0, and then control thin film transistor (TFT) T conducting, data line C connects source S 0, with when the thin film transistor (TFT) T conducting through source S 0 transmission data drive signal to pixel electrode P.
In the present embodiment, same sweep trace A drives a plurality of pixel cells 21, and these a plurality of pixel cells 21 show as shown in Figure 2 color G, R and B respectively.When sweep trace A transmission scanning drive signal, the thin film transistor (TFT) T of a plurality of pixel cells 21 of same sweep trace A driving opens, at this moment, many data line C transmit the pixel electrode P of data drive signal in the corresponding pixel cell 21 simultaneously, to charge to the pixel cell 21 that shows different colours.In the present embodiment, because the resistance in the liquid crystal indicator 20 and the influence of electric capacity, the scanning drive signal that makes scanner driver 22 produce produces delay phenomenon when changing to noble potential by electronegative potential.Therefore present embodiment adopts 23 pairs of scanning drive signal of top rake circuit to carry out top rake, and concrete top rake circuit 23 as shown in Figure 3.
See also Fig. 3, top rake circuit 23 of the present utility model comprises the first N-type metal-oxide-semiconductor 231, the second N-type metal-oxide-semiconductor 232, P type metal-oxide-semiconductor 233, first resistance 234, second resistance 235, the 3rd resistance 236, RC circuit 237 and first electric capacity 238.Wherein, the grid G 1 of the first N-type metal-oxide-semiconductor 231 receives scanning drive signal GVOF, source S 1 ground connection of the first N-type metal-oxide-semiconductor 231, the drain D 1 of the first N-type metal-oxide-semiconductor 231 is connected the source S 3 of P type metal-oxide-semiconductor 233 through first resistance 234 and second resistance 235, and reception reference voltage signal VGHF, the grid G 3 of P type metal-oxide-semiconductor 233 is connected between first resistance 234 and second resistance 235, the drain D 3 of P type metal-oxide-semiconductor 233 connects sweep trace A, source S 2 ground connection of the second N-type metal-oxide-semiconductor 232, the grid G 2 of the second N-type metal-oxide-semiconductor 232 connects the inversion signal GVON of scanning drive signal, the drain D 2 of the second N-type metal-oxide-semiconductor 232 is connected to the drain D 3 of P type metal-oxide-semiconductor 233 through the 3rd resistance 236, first end of first end of RC circuit 237 and first electric capacity 238 is connected between the connected node and sweep trace A of the drain D 3 of P type metal-oxide-semiconductor 233 and the 3rd resistance 236, the second end ground connection of second end of RC circuit 237 and first electric capacity 238.
Wherein, also comprise a voltage stabilizing diode 239 between the second N-type metal-oxide-semiconductor and the 3rd resistance 236, and the positive pole of voltage stabilizing diode 239 is connected with the drain D 2 of the second N-type metal-oxide-semiconductor 232, negative pole is connected with the 3rd resistance 236.RC circuit 237 comprises second electric capacity 2371 and the 4th resistance 2372 that series connection arranges, and first end of second electric capacity 2371 is connected between the connected node and sweep trace A of the drain D 3 of P type metal-oxide-semiconductor 233 and the 3rd resistance 236, second end of second electric capacity 2371 connects first end of the 4th resistance 2372, the second end ground connection of the 4th resistance 2372.
Below the principle of work of top rake circuit 23 shown in Figure 3 is elaborated:
In the present embodiment, when scanning drive signal GVOF was low level, the first N-type metal-oxide-semiconductor 231 ended, and the voltage of the grid G 3 of P type metal-oxide-semiconductor 233 equals the voltage of source S 3, and P type metal-oxide-semiconductor 233 ends.At this moment, the inversion signal GVON of scanning drive signal is high level, and 232 conductings of the second N-type metal-oxide-semiconductor make the plus earth of voltage stabilizing diode 239, the negative edge of the scanning drive signal VGH of sweep trace A is carried out top rake handle.When scanning drive signal GVOF is high level, 231 conductings of the first N-type metal-oxide-semiconductor, the grid G 3 of P type metal-oxide-semiconductor 233 is low level, voltage less than its source S 3,233 conductings of P type metal-oxide-semiconductor, reference voltage signal VGHF transfers to sweep trace A, and make the rising edge of scanning drive signal VGH carry out top rake processing by RC circuit 237 this moment.At this moment, the inversion signal GVON of scanning drive signal is low level, and the second N-type metal-oxide-semiconductor 232 ends, and the circuit of voltage stabilizing diode 239 disconnects, and the scanning drive signal VGH of sweep trace A is not carried out top rake handle.
See also Fig. 4, Fig. 4 is the oscillogram of each signal of 23 receptions of the utility model top rake circuit and output.Wherein, the original scanning drive signal GVOF that produces of scanner driver 22 obtains the scanning drive signal VGH behind the top rake after through top rake circuit 23.In the present embodiment, the rising edge of the scanning drive signal VGH behind the top rake and negative edge all are inclined to a rake at least, and as shown in Figure 4, rising edge and negative edge all are inclined to the rake of an arc line type.In other embodiments, the rising edge of the scanning drive signal VGH behind the top rake and negative edge be the be in line rake of type of tiltable also, specifically as shown in Figure 5.
See also Fig. 5, the rising edge of the scanning drive signal VGH behind the top rake is inclined to first rake 501.And first rake 501 tilts to rise to the high level of the scanning drive signal VGH behind the top rake from first level, and first level is between the low level of the high level of the scanning drive signal VGH behind the top rake and the scanning drive signal VGH behind the top rake.Present embodiment is controlled the voltage span of first rake 501 by the resistance value of the 4th resistance 2372, and controls the time span of first rake 501 by the capacitance of second electric capacity 2371.Concrete, the resistance value of the 4th resistance 2372 is more big, and the voltage span of first rake 501 is more little; The capacitance of second electric capacity 2371 is more big, and the time span of first rake 501 is more big, and namely the time of top rake is more long.
In like manner, the negative edge of the scanning drive signal VGH behind the top rake is inclined to second rake 502.Second rake 502 tilts to drop to the low level of the scanning drive signal VGH behind the top rake from second level, and second level is between the low level of the high level of the scanning drive signal VGH behind the top rake and the scanning drive signal VGH behind the top rake.Present embodiment is controlled the minimum point of the voltage span of second rake 502 by the circuit of voltage stabilizing diode 239.
It should be noted that 23 rising edge and negative edges to scanning drive signal GVOF of top rake circuit carry out top rake, therefore, the high level of the scanning drive signal VGH behind the top rake and low level equate with high level and the low level of scanning drive signal GVOF respectively.
Therefore, the waveform similarity of the rising edge of the scanning drive signal VGH after each top rake or identical, make that the time of opening each thin film transistor (TFT) T is close or equal, thereby make that the voltage that charges into the pixel electrode P in each pixel cell 21 is close or equal, therefore, the brightness that has guaranteed the color that each pixel cell 21 shows is close or identical, thereby has reduced color offset phenomenon, has improved the display quality of display device.
See also Fig. 6, Fig. 6 is the process flow diagram of driving method of a kind of liquid crystal indicator of the utility model second embodiment.As shown in Figure 6, driving method of the present utility model comprises:
Step S61: scanning drive signal is provided;
Step S62: the rising edge to scanning drive signal carries out top rake;
In step S62, in order to eliminate horizontal influence between two adjacent unit pixel, the utility model further carries out top rake to the negative edge of scanning drive signal.
Concrete top rake circuit here repeats no more as mentioned before.
Step S63: the scanning drive signal behind the top rake is transferred to sweep trace.
In step S63, the scanning drive signal of sweep trace after with top rake is transferred to the grid of thin film transistor (TFT), to open thin film transistor (TFT).When thin film transistor (TFT) was opened, data line was transferred to the source electrode of thin film transistor (TFT) with data drive signal, and the source electrode by thin film transistor (TFT) further is transported to pixel electrode, and pixel electrode carries out the demonstration of color according to the data drive signal that receives.Because the utility model has carried out top rake to the rising edge of scanning drive signal, make that the time of opening each thin film transistor (TFT) is close or equal, thereby make that the voltage that charges into the pixel electrode in each pixel cell is close or equal, therefore, the brightness that has guaranteed the color that each pixel cell shows is close or identical, thereby reduced color offset phenomenon, improved the display quality of display device.
The above only is embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model instructions and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (5)
1. a liquid crystal indicator is characterized in that, described liquid crystal indicator comprises:
Pixel cell;
Data line is used for the transmission data drive signal to described pixel cell;
Scanner driver is for generation of scanning drive signal;
The top rake circuit is connected with described scanner driver, and described top rake circuit carries out top rake to the rising edge of described scanning drive signal;
Sweep trace is used for the described scanning drive signal behind the top rake is transferred to described pixel cell.
2. liquid crystal indicator according to claim 1, it is characterized in that, described pixel cell comprises thin film transistor (TFT) and pixel electrode, described thin film transistor (TFT) comprises grid, source electrode and drain electrode, described pixel electrode connects described drain electrode, described sweep trace connects described grid, so that the described scanning drive signal behind the top rake is transferred to described grid, and then control described thin film transistor (TFT) conducting, described data line connects described source electrode, with when the described thin film transistor (TFT) conducting through described source electrode transmission data drive signal to described pixel electrode.
3. liquid crystal indicator according to claim 1 is characterized in that, described top rake circuit further carries out top rake to the negative edge of described scanning drive signal.
4. liquid crystal indicator according to claim 1, it is characterized in that, described top rake circuit comprises the first N-type metal-oxide-semiconductor, the second N-type metal-oxide-semiconductor, P type metal-oxide-semiconductor, first resistance, second resistance, the 3rd resistance, RC circuit and first electric capacity, wherein, the grid of the described first N-type metal-oxide-semiconductor receives described scanning drive signal, the source ground of the described first N-type metal-oxide-semiconductor, the drain electrode of the described first N-type metal-oxide-semiconductor is connected the source electrode of described P type metal-oxide-semiconductor through described first resistance and described second resistance, and reception reference voltage signal, the grid of described P type metal-oxide-semiconductor is connected between described first resistance and described second resistance, the drain electrode of described P type metal-oxide-semiconductor connects described sweep trace, the source ground of the described second N-type metal-oxide-semiconductor, the grid of the described second N-type metal-oxide-semiconductor connects the inversion signal of described scanning drive signal, the drain electrode of the described second N-type metal-oxide-semiconductor is connected to the drain electrode of described P type metal-oxide-semiconductor through the 3rd resistance, first end of described RC circuit and first end of described first electric capacity are connected between the connected node and described sweep trace of the drain electrode of described P type metal-oxide-semiconductor and described the 3rd resistance, the second end ground connection of second end of described RC circuit and described first electric capacity.
5. liquid crystal indicator according to claim 4 is characterized in that, described RC circuit comprises that series connection arranges second electric capacity and the 4th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320145567 CN203179487U (en) | 2013-03-27 | 2013-03-27 | Liquid crystal display apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320145567 CN203179487U (en) | 2013-03-27 | 2013-03-27 | Liquid crystal display apparatus |
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| CN203179487U true CN203179487U (en) | 2013-09-04 |
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| CN 201320145567 Expired - Lifetime CN203179487U (en) | 2013-03-27 | 2013-03-27 | Liquid crystal display apparatus |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103198804A (en) * | 2013-03-27 | 2013-07-10 | 深圳市华星光电技术有限公司 | Liquid crystal display device and driving method thereof |
| CN104332145A (en) * | 2014-11-07 | 2015-02-04 | 深圳市华星光电技术有限公司 | Liquid crystal panel and driving method thereof as well as liquid crystal display |
| CN104332148A (en) * | 2014-11-20 | 2015-02-04 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and drive method thereof |
| WO2017020380A1 (en) * | 2015-07-31 | 2017-02-09 | 深圳市华星光电技术有限公司 | Clipping circuit, liquid crystal display with the clipping circuit, and driving method |
| CN107068103B (en) * | 2017-05-27 | 2018-08-24 | 惠科股份有限公司 | Potential transfer circuit, driving method and display panel applying same |
| CN113096612A (en) * | 2021-04-08 | 2021-07-09 | 福州京东方光电科技有限公司 | Chamfered IC, display panel and display device |
-
2013
- 2013-03-27 CN CN 201320145567 patent/CN203179487U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103198804A (en) * | 2013-03-27 | 2013-07-10 | 深圳市华星光电技术有限公司 | Liquid crystal display device and driving method thereof |
| CN103198804B (en) * | 2013-03-27 | 2015-09-16 | 深圳市华星光电技术有限公司 | A kind of liquid crystal indicator and driving method thereof |
| CN104332145A (en) * | 2014-11-07 | 2015-02-04 | 深圳市华星光电技术有限公司 | Liquid crystal panel and driving method thereof as well as liquid crystal display |
| CN104332145B (en) * | 2014-11-07 | 2017-03-01 | 深圳市华星光电技术有限公司 | Liquid crystal panel and its driving method, liquid crystal display |
| CN104332148A (en) * | 2014-11-20 | 2015-02-04 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and drive method thereof |
| WO2017020380A1 (en) * | 2015-07-31 | 2017-02-09 | 深圳市华星光电技术有限公司 | Clipping circuit, liquid crystal display with the clipping circuit, and driving method |
| CN107068103B (en) * | 2017-05-27 | 2018-08-24 | 惠科股份有限公司 | Potential transfer circuit, driving method and display panel applying same |
| CN113096612A (en) * | 2021-04-08 | 2021-07-09 | 福州京东方光电科技有限公司 | Chamfered IC, display panel and display device |
| CN113096612B (en) * | 2021-04-08 | 2022-10-25 | 福州京东方光电科技有限公司 | Chamfered ICs, Display Panels and Display Devices |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130904 |
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| CX01 | Expiry of patent term |