CN1238828C - Method for driving liquid crystal display - Google Patents
Method for driving liquid crystal display Download PDFInfo
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- CN1238828C CN1238828C CN 02100992 CN02100992A CN1238828C CN 1238828 C CN1238828 C CN 1238828C CN 02100992 CN02100992 CN 02100992 CN 02100992 A CN02100992 A CN 02100992A CN 1238828 C CN1238828 C CN 1238828C
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- voltage
- voltage follower
- driver element
- output terminal
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Abstract
The present invention provides a method for driving a liquid crystal displayer. The liquid crystal displayer comprises a voltage generator which comprises a plurality of output ends used for outputting multiple voltages, each output end of the voltage generator is connected to a plurality of driving units, each driving unit is provided with a voltage follower and a switch, and the first end of each switch can be connected to the output end of each voltage follower or the input end of each voltage follower; the second end of each switch is connected to the output end of each driving unit. The method comprises the following steps that the first end of each switch is connected to the output end of each voltage follower, and then the first end of each switch is connected to the input end of each voltage follower.
Description
Technical field
The present invention provides a kind of method that drives LCD, particularly a kind of method that is shown consistent gray level on the LCD with each pixel that has the same target current potential in delegation's pixel that makes.
Background technology
LCD has that external form is frivolous, power consumption is few and characteristic such as radiationless pollution, be widely used on the portable type information products such as notebook (notebook), PDA(Personal Digital Assistant), even existing kinescope (cathode ray tube, CRT) trend of monitor that replaces conventional desktop computer gradually.Because liquid crystal molecule is under different ordered states, light had different polarizations or refraction effect, therefore can control the amount of penetrating of light via the liquid crystal molecule of different ordered states, further produce the output light of varying strength, and LCD promptly is to utilize this specific character of liquid crystal molecule to produce red, blue, the green glow of different grey-scale intensity, further makes LCD produce abundant image.
With reference to Fig. 1, Fig. 1 is known thin film transistor (TFT) (thin film transistor, TFT) synoptic diagram of LCD 10.LCD 10 comprises display panels (LCD panel) 12, control circuit 14, the first driving circuits 16, the second driving circuits 18, the first voltage generators 20, and second voltage generator 22.Display panels 12 is to be made of two substrates (substrate), and is filled with liquid crystal material (LCD layer) between two substrates.A substrate in the two substrates is provided with many first leads (data line) 24, many second leads (gateline) 26 perpendicular to first lead 24, and a plurality of thin film transistor (TFT)s 28, be used for providing a fixed voltage (Vcom) and be provided with common electrode (common electrode) via first voltage generator 20 in another substrate.For ease of explanation, only show a thin film transistor (TFT) 28 among Fig. 1, in fact, the junction (intersection) of each first lead 24 and second lead 26 all is connected with a thin film transistor (TFT) 28 in the display panels 12, so being the modes with matrix (matrix), thin film transistor (TFT) 28 is distributed on the display panels 12, second lead 26 that promptly is first lead 24 corresponding to first row (column) of Thin Film Transistor-LCD 10 is corresponding to each row (row) of Thin Film Transistor-LCD 10, and each thin film transistor (TFT) 28 is corresponding to a pixel (pixel).In addition, the circuit characteristic that two substrates constituted of display panels 12 can be considered an equivalent capacity 30.
Details are as follows for the drive principle of known Thin Film Transistor-LCD 10, when control circuit 14 receives horizontal-drive signal (horizontal synchronization) 32 and vertical synchronizing signal (vertical synchronization) 34, control circuit 14 can produce corresponding control signal and import first driving circuit 16 and second driving circuit 18 respectively, first driving circuit 16 and second driving circuit 18 can produce input signal to different first leads 24 (for example DL3) and second lead 26 (for example GL3) according to this control signal then, thereby the potential difference (PD) at the conducting of control TFT 28 and equivalent capacity 30 two ends, and change the arrangement of liquid crystal molecule and the amount of penetrating of corresponding light further, for instance, pulse of 18 pairs second leads of second driving circuit, 26 inputs makes thin film transistor (TFT) 28 conductings, therefore first driving circuit 16 signal of import first lead 24 can import equivalent capacity 30 via thin film transistor (TFT) 28, so reaches gray level (graylevel) state of controlling corresponding pixel.In addition, the signal magnitude that first driving circuit 16 is imported first lead 24 is produced by second voltage generator 22, second voltage generator 22 comprises a plurality of bleeder circuit (not shown)s, be used for producing different voltage potential V0～Vn with drive thin film transistors 28, and different voltage levels is promptly corresponding to different gray level sizes.
With reference to Fig. 1 and Fig. 2, Fig. 2 is the driving synoptic diagram of LCD 10 shown in Figure 1.Second voltage generator 22 comprises a plurality of operation amplifier circuits 37 in addition, is used for different voltage potential V0～Vn of being produced according to second voltage generator 22 and drives corresponding thin film transistor (TFT) 28 respectively.Operation amplifier circuit 37 comprises a plurality of operational amplifiers 44,45,46,47,48,49, and each operational amplifier 44,45,46,47,48,49 constitutes voltage follower respectively.If control circuit receives horizontal-drive signal 32 and vertical synchronizing signal 34 and produces corresponding first driving circuit 16 and second driving circuit 18 of controlling signal to, when producing a pulse, second driving circuit 18 makes the last equal conducting of all thin film transistor (TFT)s of GL6 in second lead 26 with delegation, that is thin film transistor (TFT) 38,39,40,41,42,43 also is conducting state, then first driving circuit 16 can be learnt DL3 in first lead 24 according to video data 36, DL4, DL5, DL6, DL7, DL8 needs to drive with voltage V1, therefore come drive thin film transistors 38 via operation amplifier circuit 37,39,40,41,42,43 to required target current potential V1, yet operational amplifier 44,45,46,47,48,49 pairs of errors that output voltage caused (offset) influence is unequal, therefore cause electric capacity 50,51,52,53,54, the potential difference (PD) at 55 two ends is unequal, and according to video data 36, corresponding to DL3 in first lead 24, DL4, DL5, DL6, DL7, the pixel of DL8 should show same grey level in display panels 12, but because operational amplifier 44,45,46,47,48, therefore the error that 49 pairs of output voltages caused and cause the gray-scale state of display frame inconsistent influences the quality that picture shows.
Summary of the invention
Therefore, fundamental purpose of the present invention is to provide a kind of apparatus and method that drive LCD, is shown consistent gray level so that have each pixel of same target current potential in the same delegation pixel of LCD.
The invention provides a kind of device that drives LCD, this device comprises: a voltage generator; And one first driver element, couple this voltage generator, wherein this first driver element comprises: one first voltage follower; With one first switch, the optionally input end of the output terminal of the output terminal of this first voltage follower of conducting and this first driver element or this first voltage follower of conducting and the output terminal of this first driver element; One second driver element couples this voltage generator, and wherein this second driver element comprises: one second voltage follower; With a second switch, the optionally input end of the output terminal of the output terminal of this second voltage follower of conducting and this second driver element or this second voltage follower of conducting and the output terminal of this second driver element; It is identical with the input voltage current potential of this second voltage follower wherein to work as this first voltage follower, and the output terminal conducting of the input end of this first voltage follower and this first driver element, then the input end short circuit of the input end of this first voltage follower and this second voltage follower.
Claim of the present invention provides a kind of method that drives LCD, this LCD comprises a display panels, is used for showing the pixel of a plurality of row with arrayed, and a voltage generator, it includes a plurality of output terminals, is used for exporting a plurality of voltage potentials.Each output terminal of this voltage generator is connected in a plurality of driver elements, each driver element has a voltage follower and a switch, first end of this switch is to be used for optionally connecting the input end or the output terminal of this voltage follower, second end of this switch is connected in the output terminal of this driver element, and the input end of voltage follower of a plurality of driver elements that wherein is connected in the same output terminal of this voltage generator is to be connected on the same lead.This method comprises the output terminal that first end of this switch is connected in this voltage follower, voltage potential with output terminal that the output voltage of this driver element is connected with this driver element towards this voltage generator drives, and first end of this switch is connected in the input end of this voltage follower, so that the output voltage of this driver element average potential towards the output terminal of a plurality of driver elements of the same output terminal that is connected in this voltage generator is driven.
Description of drawings
Fig. 1 is the synoptic diagram of known Thin Film Transistor-LCD;
Fig. 2 is the driving synoptic diagram of operation amplifier circuit shown in Figure 1;
Fig. 3 is the synoptic diagram of operation amplifier circuit of the present invention.
The explanation of label in the accompanying drawing
10 LCD, 12 display panels
14 control circuits, 16 first driving circuits
18 second driving circuits, 20 first voltage generators
22 second voltage generators, 24 first leads
26 second leads
28,38,39,40,41,42,43 thin film transistor (TFT)s
30,50,51,52,53,54,55 equivalent capacitys
32 horizontal-drive signals
34 vertical synchronizing signals, 36 video datas
37,60 operation amplifier circuits, 62 operational amplifiers
64 change-over switches, 66 leads
Embodiment
With reference to Fig. 1, Fig. 2 and Fig. 3, Fig. 3 is the synoptic diagram of operation amplifier circuit 60 of the present invention, and operation amplifier circuit 60 of the present invention is to be used for replacing operation amplifier circuit shown in Figure 2 37.Operation amplifier circuit 60 comprises a plurality of operational amplifiers 62 or computing transduction amplifier (operationaltransconductance amplifier, OTA) be used for constituting voltage follower, and a plurality of change-over switches 64 are used for the Control current path, if second driving circuit 18 is according to horizontal-drive signal 32 inputs one pulse to the second lead 26, therefore make all thin film transistor (TFT) 28 conductings that are positioned on same second lead 26, then first driving circuit 16 must be in first lead 24 according to video data 36 DL1, DL2, the signal of DL3...DLn input voltage V1 is to produce corresponding gray-scale value, at this moment, change-over switch 64 conducting two-end-point S1, S2 makes voltage V1 can drive electric capacity 30 via operational amplifier 62, yet, because the circuit characteristic difference of nonidentity operation amplifier 62, also different for the bias value that output voltage caused, so DL1 of first lead 24, DL2, the voltage of DL3...DLn is subjected to the influence of operational amplifier 62 to produce different bias values, therefore corresponding to the DL1 of first lead 24, DL2, the electric capacity 30 of DL3...DLn can be stored different voltage differences respectively.Then, change-over switch 64 conducting two-end-point S1, S3 and change current path, therefore voltage V1 is not driving electric capacity 30 via operational amplifier 62, but, make each electric capacity 30 reach equilibrium state fast and all have identical potential difference (PD) in electric capacity 30 via lead 66 owing to change-over switch 64 conducting two-end-point S1, S3 are connected on the same lead 66 each electric capacity 30.
For instance, at first connect two-end-point S1 via change-over switch 64, S2, if magnitude of voltage V1 is 5 volts, and the DL1 of first lead 24, DL2, the voltage of DL3...DLn via operational amplifier 62 formed voltage followers promptly to 5 volts of drivings of magnitude of voltage, but the DL1 of first lead 24, DL2, the voltage of DL3...DLn can produce different bias values because of nonidentity operation amplifier 62, so DL1, DL2, voltage on the DL3...DLn is respectively 4.8 volts, 5.1 volt, 4.7 volt ... 4.9 volts, connect two-end-point S1 with change-over switch 64 this moment, S3, because the DL1 of first lead 24, DL2, DL3...DLn is all by two-end-point S1, S3 and being electrically connected on the same lead 66, so DL1 of first lead 24, DL2, the voltage of DL3...DLn can produce an average voltage level rapidly via this lead 66, that is to say, DL1, DL2, the voltage of DL3...DLn is respectively by original 4.8 volts, 5.1 volt, 4.7 volt ... 4.9 volts, make DL1 via the conduction of lead 66, DL2, DL3...DLn reaches an average voltage.
Compare with known technology, driver element of the present invention at first uses a change-over switch to connect the output terminal of voltage follower, and a target current potential that produces with bleeder circuit drives on the display panels with each pixel that has the same target current potential in delegation's pixel, though drive this moment between output potential and the target current potential of driver element of each pixel different errors arranged, right face, when at last connecting the output terminal of voltage follower and make the output terminal of corresponding driver element all be connected on the same lead by this switch, the different output terminal current potentials of the driver element of original each pixel, reach same current potential apace via the quick conduction of this lead, this current potential is the mean value for the different output terminal current potentials of the driver element of each pixel, though this current potential not necessarily equates with the target current potential, but with predetermined each pixel that is urged to a same target current potential in delegation's pixel via drive unit drives of the present invention after, each pixel all is urged to same current potential, thereby can improve known technology because the color of the uneven display frame that causes of pixel current potential shows inhomogeneous situation.
The above only is the preferred embodiments of the present invention, and all equivalent variations and modifications of making according to claim of the present invention all should belong to the covering scope of patent of the present invention.
Claims (9)
1. device that drives LCD, this device comprises:
A voltage generator; And
One first driver element couples this voltage generator, and wherein this first driver element comprises:
One first voltage follower; With
One first switch, the optionally input end of the output terminal of the output terminal of this first voltage follower of conducting and this first driver element or this first voltage follower of conducting and the output terminal of this first driver element;
One second driver element couples this voltage generator, and wherein this second driver element comprises:
One second voltage follower; With
A second switch, the optionally input end of the output terminal of the output terminal of this second voltage follower of conducting and this second driver element or this second voltage follower of conducting and the output terminal of this second driver element;
It is identical with the input voltage current potential of this second voltage follower wherein to work as this first voltage follower, and the output terminal conducting of the input end of this first voltage follower and this first driver element, then the input end short circuit of the input end of this first voltage follower and this second voltage follower.
2. device as claimed in claim 1, wherein this first voltage follower comprises an operational amplifier in addition.
3. device as claimed in claim 1, wherein this first voltage follower comprises computing transduction amplifier in addition.
4. device as claimed in claim 1, wherein the input end of the input end of this first voltage follower and this second voltage follower is via a lead short circuit of this voltage generator.
5. device as claimed in claim 1, wherein the voltage potential of the output terminal of this voltage generator is produced by a bleeder circuit.
6. device that drives LCD, this device comprises:
A voltage generator; And
A driver element couples this voltage generator, and wherein this driver element comprises:
A voltage follower; With
A switch, the optionally input end of the output terminal of the output terminal of this voltage follower of conducting and this driver element or this voltage follower of conducting and the output terminal of this driver element.
7. device as claimed in claim 6, wherein this voltage follower comprises an operational amplifier in addition.
8. device as claimed in claim 6, wherein this voltage follower comprises computing transduction amplifier in addition.
9. device as claimed in claim 6, wherein the voltage potential of the output terminal of this voltage generator is produced by a bleeder circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100992 CN1238828C (en) | 2002-01-11 | 2002-01-11 | Method for driving liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100992 CN1238828C (en) | 2002-01-11 | 2002-01-11 | Method for driving liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1431645A CN1431645A (en) | 2003-07-23 |
| CN1238828C true CN1238828C (en) | 2006-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02100992 Expired - Lifetime CN1238828C (en) | 2002-01-11 | 2002-01-11 | Method for driving liquid crystal display |
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| CN (1) | CN1238828C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5041393B2 (en) | 2005-08-16 | 2012-10-03 | 株式会社ジャパンディスプレイウェスト | Display device |
| CN101930705A (en) * | 2009-06-19 | 2010-12-29 | 立景光电股份有限公司 | Pixel circuit of display device and display method thereof |
| TWI675363B (en) * | 2018-09-04 | 2019-10-21 | 友達光電股份有限公司 | Display, display driving device and the driving method thereof |
| CN110232896A (en) * | 2019-05-21 | 2019-09-13 | 武汉华星光电技术有限公司 | Membrane transistor liquid crystal display array base-plate structure |
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2002
- 2002-01-11 CN CN 02100992 patent/CN1238828C/en not_active Expired - Lifetime
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| CN1431645A (en) | 2003-07-23 |
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Granted publication date: 20060125 |