CN102013237A - Drive device for driving liquid crystal display panel and relevant display device thereof - Google Patents
Drive device for driving liquid crystal display panel and relevant display device thereof Download PDFInfo
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- CN102013237A CN102013237A CN2009101691114A CN200910169111A CN102013237A CN 102013237 A CN102013237 A CN 102013237A CN 2009101691114 A CN2009101691114 A CN 2009101691114A CN 200910169111 A CN200910169111 A CN 200910169111A CN 102013237 A CN102013237 A CN 102013237A
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Abstract
The invention relates to a drive device for driving a liquid crystal display panel and a relevant display device thereof. The liquid crystal display panel comprises a substrate and a plurality of pixel units, wherein all the pixel units are arranged on the substrate in a matrix mode. The drive device comprises a grid electrode driver, a voltage generator and a source electrode driver, wherein the grid electrode driver is used for generating a plurality of scanning signals, and each scanning signal is used for driving one row of pixel units on the liquid crystal display panel; the voltage generator is used for providing a nonnegative common signal for the substrate according to a conversion period signal; the source electrode driver is used for generating a plurality of source electrode drive signals according to a compensation indication signal, a picture signal and the conversion period signal each source electrode drive signal is used for driving one row of pixel units on the liquid crystal display panel.
Description
Technical field
The present invention relates to a kind of drive unit and related display apparatus thereof that is used for driving a display panels, relate in particular to a kind of by adjusting the one source pole drive signal, improve the scintillation of display panels, with drive unit and the related display apparatus thereof of simplifying its power supply circuit.
Background technology
(Liquid Crystal Display LCD) has that external form is frivolous, power consumption is few and a characteristic such as radiationless pollution to LCD, has been widely used on the information products such as various computer system, mobile phone, PDA(Personal Digital Assistant).The principle of work of LCD is to utilize liquid crystal molecule 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 the red, green, blue of different GTG intensity.
Please refer to Fig. 1, Fig. 1 is prior art one thin film transistor (TFT) (Thin Film Transistor, TFT) synoptic diagram of LCD 10.LCD 10 comprises a display panels (LCD Panel) 100, one source pole driver 102, a gate drivers 104 and a voltage generator 106.Display panels 100 is made of two substrates (Substrate), and is filled with liquid crystal material (LCD layer) between two substrates.One substrate is provided with many data lines (Data Line) 108, many (the Scan Line of the sweep trace perpendicular to data line 108, or title gate line, Gate Line) 110 and a plurality of thin film transistor (TFT) 112, be used for providing a shared signal Vcom with electrode (Common Electrode) and be provided with altogether via voltage generator 106 in another substrate.Thin film transistor (TFT) 112 is distributed on the display panels 100 in the mode of matrix, each data line 108 is corresponding to the delegation on the display panels 100 (Column), and sweep trace 110 is listed as (Row) corresponding to one on the display panels 100, and each thin film transistor (TFT) 112 is corresponding to a pixel (Pixel).In addition, the circuit characteristic that two substrates constituted of display panels 100 can be considered an equivalent electric capacity 114.
Source electrode driver 102 and gate drivers 104 can produce input signal to different data line 108 and sweep trace 110 respectively according to the view data that desire shows, with the conducting of control TFT 112 and the cross-pressure at equivalent capacity 114 two ends, change the arrangement and the corresponding light penetration amount of liquid crystal molecule further, make view data correctly be presented on the display panels 100.Yet, can reduce polarization or the refraction effect of liquid crystal molecule if use positive voltage (or negative voltage) to drive liquid crystal molecule for a long time to light, the quality that makes picture show worsens.Therefore, for the destruction of protecting liquid crystal molecule not to be subjected to driving voltage, the method that must use generating positive and negative voltage to present alternately drives liquid crystal molecule.In addition, except equivalent capacity 114, display panels 100 also comprises stray capacitance (ParasiteCapacitor), so when same view data showed on display panels 100 when of a specified duration, this stray capacitance can produce ghost phenomena (ResidualImage Effect) because of stored charge, and influence the demonstration of follow-up picture, so also the mode that must utilize generating positive and negative voltage to present alternately drives liquid crystal molecule to improve the influence of stray capacitance to image output.
Yet when the mode that presents alternately by generating positive and negative voltage drove pixel, the picture of LCD 10 can cause the phenomenon of film flicker (Flicker) because of thin film transistor (TFT) 112 formed voltage deviations (Offset) own.Therefore, prior art takes different type of drive to drive display panels 100, to improve the film flicker phenomenon, and a row reverse drive (Line Inversion) mode for example.Specifically, please refer to Fig. 2, Fig. 2 be shared signal Vcom and one source pole drive signal VS_x the time become synoptic diagram, the mode that presents alternately by generating positive and negative voltage as desire drives display panels 100, source electrode driver 102 fibrous roots are according to view data, select suitable voltage level as source drive signal VS_x, and according to a transition (conversion) periodic signal, periodically invert source drive signal VS_x.In addition, voltage generator 106 fibrous roots are adjusted shared signal Vcom according to the degree of film flicker, with the compensation phenomenon of picture flicker, and according to the transition periodic signal, periodically anti-phase shared signal Vcom.Thus, cross-pressure Δ V+, the Δ V-at equivalent capacity 114 two ends just can correctly drive liquid crystal molecule, with display image data.In other words, the power supply circuit of LCD 10 (not being plotted in Fig. 1) must possess the function that various positive and negative voltage level is provided at any time, the framework that means power supply circuit is very complicated, causes the cost of the drive unit of LCD 10 to reduce effectively.
Therefore,, make the drive unit of known LCD be able to better simply power supply circuit, realize that the mode that presents alternately with generating positive and negative voltage drives LCD, has become one of effort target of industry how by changing type of drive.
Summary of the invention
Therefore, fundamental purpose of the present invention promptly is to provide a kind of drive unit and related display apparatus thereof that is used for driving a display panels.
The present invention discloses a kind of drive unit that is used for driving a display panels.This display panels includes a substrate and a plurality of pixel cell, and each pixel cell is arranged on this substrate with matrix-style.This drive unit includes a gate drivers, is coupled to this a plurality of pixel cells, is used for producing a plurality of sweep signals, and each sweep signal is used for driving this pixel cell that one of this display panels lists; One voltage generator is coupled to this substrate, is used for according to a transition periodic signal, provides a non-negative shared signal to this substrate; And one source pole driver, be coupled to this display panels, be used for producing a plurality of source electrode drive signals according to compensation indicator signal, a picture signal and this transition periodic signal, each source drive signal is used for driving this pixel cell in the delegation of this display panels; Wherein, this compensation indicator signal is used to refer to flicker (flicker) amplitude that whether compensates these a plurality of pixel cells.
The present invention discloses a kind of display device in addition, includes a display panels, includes a substrate; And a plurality of pixel cells, be arranged on this substrate with matrix-style; One color analyzer is coupled to this display panels, is used for measuring flicker (flicker) amplitude of these a plurality of pixel cells, to produce a compensation indicator signal; Time schedule controller is used for receiving view data, to produce a picture signal and a transition periodic signal; And a drive unit, be used for driving this display panels, include a gate drivers, be coupled to this a plurality of pixel cells, be used for producing a plurality of sweep signals, each sweep signal is used for driving this pixel cell that one of this display panels lists; One voltage generator is coupled to this substrate and this time schedule controller, is used for according to this transition periodic signal, provides a non-negative shared signal to this substrate; And one source pole driver, be coupled to this color analysis device, this time schedule controller and this display panels, be used for according to this compensation indicator signal, this picture signal and this transition periodic signal, produce a plurality of source electrode drive signals, each source drive signal is used for driving this pixel cell in the delegation of this display panels.
Description of drawings
Fig. 1 is the synoptic diagram of prior art one Thin Film Transistor-LCD.
Fig. 2 be in the LCD of Fig. 1 a shared signal and one source pole drive signal the time become synoptic diagram.
Fig. 3 is the synoptic diagram of the embodiment of the invention one drive unit.
Fig. 4 be in the drive unit of Fig. 3 a shared signal and one source pole drive signal the time become synoptic diagram.
Fig. 5 is the synoptic diagram of one source pole driver in the drive unit of Fig. 3.
Fig. 6 is the synoptic diagram of a gamma electric voltage producer in the source electrode driver of Fig. 5.
Fig. 7 A and Fig. 7 B are the voltage level synoptic diagram of coherent signal in the source electrode driver of Fig. 5.
Fig. 8 is the synoptic diagram of a voltage generator in the drive unit of Fig. 3.
Fig. 9 is the synoptic diagram of the embodiment of the invention one display device.
[main element symbol description]
The Vcom shared signal
V
1, V
2, V
3, V
4, V
5, V
6, V
7, V
8The ideal gray level value
V
1', V
2', V
3', V
4', V
5', V
6', V
7', V
8' the actual gray value
V
1", V
2", V
3", V
4", V
5", V
6", V
7", V
8" compensation back GTG value
VG_1, VG_2, VG_M-1, VG_M sweep signal
VS_1, VS_2, VS_N-1, VS_N, VS_x source drive signal
The Vd side-play amount
The VH high-potential voltage
The VL low-potential voltage
Vbias_1 first bias voltage signal
Vbias_2 second bias voltage signal
The Vsel selection result
The high common voltage of Vcom_H
Vcom_L hangs down common voltage
The Vsw switching signal
Δ V, Δ V+, Δ V-, Δ V ', Δ V " cross-pressure
The GND ground voltage
IND compensates indicator signal
CP transition periodic signal
The FRM picture signal
The IMG view data
10 LCD
30 drive units
90 display device
32,100 display panels
102,304 source electrode drivers
104,300 gate drivers
106,302 voltage generators
108 data lines
110 sweep traces
112,308 thin film transistor (TFT)s
114,310 equivalent capacitys
500 compensating controllers
502 noble potential voltage stabilizers
504 electronegative potential voltage stabilizers
5061,5062,506N-1,506N, 506x gamma electric voltage producer
600 bleeder circuits
602 selector switchs
604 first buffer amplifiers
800 multiplexers
802 second change towards amplifier
900 color analysis devices
Embodiment
Please refer to Fig. 3, Fig. 3 is the synoptic diagram of the embodiment of the invention one drive unit 30, drive unit 30 is used for according to the signal of time schedule controller 306, drives a display panels 32, and it includes a gate drivers 300, a voltage generator 302 and one source pole driver 304.The framework of display panels 32 is similar to the display panels 100 of Fig. 1 to function mode, and it includes M * N pixel cell, is arranged on the substrate with matrix-style.Each pixel cell can equivalence be an equivalent electric capacity 310, and by a thin film transistor (TFT) 308 control both end voltage, to show correct GTG.Time schedule controller 306 is used for receiving a view data IMG, to produce a picture signal FRM and a transition (conversion) periodic signal CP.Gate drivers 300 produces sweep signal VG_1～VG_M, with the renewal sequential of the pixel cell on decision display panels 32 each row (row).Voltage generator 302 is according to transition periodic signal CP, and a non-negative shared signal Vcom is provided the substrate to display panels 32.Source electrode driver 304 is according to a compensation indicator signal IND, picture signal FRM and transition periodic signal CP, produce source drive signal VS_1～VS_N, to drive the pixel cell on display panels 32 each row (column), wherein compensate indicator signal IND and be used to refer to flicker (flicker) amplitude that whether compensates pixel cell on the display panels 32.
In simple terms, in drive unit 30, the partial function of source electrode driver 304 " replacement " voltage generator 302 in prior art, that is change by source electrode driver 304 according to compensation indicator signal IND, the flicker amplitude of compensation display panels 32 can select suitable voltage as source drive signal VS_1～VS_N according to picture signal FRM simultaneously, make the potential difference (PD) at equivalent capacity 310 two ends correctly to drive liquid crystal molecule, with display image data.Thus, voltage generator 302 must not adjusted shared signal Vcom, and only fibrous root provides the shared signal Vcom of similar traditional clock (clock) signal, as shown in Figure 4 according to transition periodic signal CP.In other words, drive unit 30 no longer needs to provide any negative voltage to display panels 32, makes the power supply circuit of LCD to simplify significantly.
About the mode of specific implementation source electrode driver 304, please continue with reference to figure 5, Fig. 5 is the synoptic diagram of source electrode driver 304.Source electrode driver 304 includes a compensating controller 500, a noble potential voltage stabilizer 502, an electronegative potential voltage stabilizer 504 and gamma (Gamma) voltage generator 5061～506N.Compensating controller 500 is used for producing one first bias voltage signal Vbias1 and one second bias voltage signal Vbias2 according to compensation indicator signal IND.Noble potential voltage stabilizer 502 is according to the first bias voltage signal Vbias1, adjusts and stablizes a high-potential voltage VH.Electronegative potential voltage stabilizer 504 is according to the second bias voltage signal Vbias2, adjusts and stablizes a low-potential voltage VL.At last, gamma electric voltage producer 5061～506N produces source drive signal VS_1～VS_N according to pixel content signal corresponding among high-potential voltage VH, low-potential voltage VL, transition periodic signal CP and the picture signal FRM.
Please continue with reference to figure 6, Fig. 6 is the synoptic diagram of arbitrary gamma electric voltage producer 506_x.Gamma electric voltage producer 506_x includes a bleeder circuit 600, a selector switch 602 and one first buffer amplifier 604.Bleeder circuit 600 produces a plurality of branch pressure voltages according to high-potential voltage VH and low-potential voltage VL.Then, selector switch 602 is selected a branch pressure voltage according to the pixel content signal of correspondence from a plurality of branch pressure voltages, again according to transition periodic signal CP, branch pressure voltage is carried out the transition operation, that is periodically select a transition voltage of branch pressure voltage or branch pressure voltage correspondence, to produce a selection result Vsel.At last, first buffer amplifier, 604 buffering selection result Vsel are to produce source drive signal VS_x.
Below illustrate the operation of source electrode driver 304 and gamma electric voltage producer 506_1～506_N compensation flicker amplitude.Please refer to Fig. 7 A, Fig. 7 A is the synoptic diagram of source electrode driver 304 correlation signal levels.For convenience of description, put aside the transition operation, suppose that preferably shared signal Vcom is a ground voltage GND, pixel cell can show 8 GTG value V
1～V
8, and pixel content signal indication source drive signal VS_x should show GTG value V
5, shown in Fig. 7 A.Yet because the assorted calculation element effect of thin film transistor (TFT) 308, in fact the cross-pressure at equivalent capacity 310 two ends is Δ V '=V
5-Vd, but not correct cross-pressure Δ V=V
5In the case, compensating controller 500 can pass through the first bias voltage signal Vbias1 and the second bias voltage signal Vbias2, promotes high-potential voltage VH and low-potential voltage VL, makes the branch pressure voltage V that bleeder circuit 600 is provided
1'～V
8' be promoted to correct level V
1"～V
8", to compensate the assorted element effect of calculating.Thus, the cross-pressure Δ V after equivalent capacity 310 compensation "=V
5"=V
5Equal the correct GTG value that desire shows.If list the transition operation in consideration, please continue 7B with reference to figure.Another state (noble potential attitude) of supposing shared signal Vcom equals GTG value V
6, then selector switch 602 should be selected GTG value V
1As source drive signal VS_x, make that the cross-pressure of equivalent capacity 310 is Δ V=V
6-V
1=V
5-0, keep continuously in the transition operation with the color of guaranteeing pixel cell.In fact, cross-pressure Δ the V '=V of equivalent capacity 310
6-V
1+ Vd, but not correct cross-pressure Δ V=V
6-V
1Similarly, compensating controller 500 also can pass through the first bias voltage signal Vbias1 and the second bias voltage signal Vbias2, promotes high-potential voltage VH and low-potential voltage VL, with uncompensated GTG value V
1'～V
8' be promoted to correct level V
1"～V
8", correctly to show the color of desire performance.
Desire realizes above-mentioned transition operation, and voltage generator 302 can preferably include a multiplexer 800 and one second buffer amplifier 802, as shown in Figure 8.Multiplexer 800 is according to the transition periodic signal, periodically selects a high common voltage Vcom_H (the GTG value V of Fig. 7 B for example
6) or a low common voltage Vcom_L (for example ground voltage GND of Fig. 7 A), switch signal Vsw to produce one.802 of second buffer amplifiers can be used to cushion switching signal Vsw, to produce shared signal Vcom.From the embodiment of Fig. 7 A and Fig. 7 B, can learn, can preferably an end of multiplexer 800 be held with being coupled to, make low common voltage Vcom_L equal ground voltage GND, to simplify required power supply circuit further.
It is noted that at this, when source electrode driver 304 shows that in compensation indicator signal IND the flicker amplitude exceeds a normal value (for example ± 2%), compensation flicker amplitude.Otherwise, then be considered as the tolerable flicker amplitude of human eye, and do not compensated in addition.
For drive unit 30 is integrated in the side circuit, the present invention provides a display device 90 in addition, as shown in Figure 9.Except drive unit 30 and display panels 32, display device 90 also comprises a color analyzer 900, in order to measure the flicker amplitude of pixel cell on the display panels 32, to produce compensation indicator signal IND.
In the prior art, LCD 10 is by voltage generator 106 modulation shared signal Vcom, to improve the scintillation on the display panels 100, needing during this time provides various positive and negative voltage level by power supply circuit, the framework that means power supply circuit is very complicated, causes the cost of the drive unit of LCD 10 to reduce effectively.In comparison, the present invention is by adjusting source drive signal VS_1～VS_N, the scintillation of compensation display panels 32, but not adjust shared signal Vcom, therefore the voltage that needn't supply negative value can be simplified the complexity and the manufacturing cost of required power supply circuit significantly to display panels 32.
In sum, the present invention improves the scintillation of display panels by adjusting the one source pole drive signal, to simplify the power supply supply of liquid crystal indicator.
The above only is the preferred embodiments of the present invention, and all equalizations of doing according to claims of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (12)
1. drive unit that is used for driving a display panels, this display panels includes a substrate and a plurality of pixel cell, and each pixel cell is arranged on this substrate with matrix-style, and this drive unit includes:
One gate drivers is coupled to this a plurality of pixel cells, is used for producing a plurality of sweep signals, and each sweep signal is used for driving this pixel cell that one of this display panels lists;
One voltage generator is coupled to this substrate, is used for according to a transition periodic signal, provides a non-negative shared signal to this substrate; And
The one source pole driver, be coupled to this display panels, be used for producing a plurality of source electrode drive signals according to compensation indicator signal, a picture signal and this transition periodic signal, each source drive signal is used for driving this pixel cell in the delegation of this display panels;
Wherein, this compensation indicator signal is used to refer to a flicker amplitude that whether compensates these a plurality of pixel cells.
2. drive unit as claimed in claim 1, wherein this source electrode driver includes:
One compensating controller is used for according to this compensation indicator signal, produces one first bias voltage signal and one second bias voltage signal;
One noble potential voltage stabilizer is coupled to this compensating controller, is used for according to this first bias voltage signal, adjusts and stablizes a high-potential voltage;
One electronegative potential voltage stabilizer is coupled to this compensating controller, is used for according to this second bias voltage signal, adjusts and stablizes a low-potential voltage; And
A plurality of gamma electric voltage producers, each gamma electric voltage producer is coupled to this noble potential voltage stabilizer and this electronegative potential voltage stabilizer, be used for pixel content signal according to a correspondence in this high-potential voltage, this low-potential voltage, this transition periodic signal and this picture signal, produce this corresponding source drive signal.
3. drive unit as claimed in claim 2, wherein this each gamma electric voltage producer includes:
One bleeder circuit is coupled to this noble potential voltage stabilizer and this electronegative potential voltage stabilizer, is used for producing a plurality of branch pressure voltages according to this high-potential voltage and this low-potential voltage;
One selector switch is coupled to this bleeder circuit, is used for according to this pixel content signal and this transition periodic signal, periodically selects a branch pressure voltage from these a plurality of branch pressure voltages, to produce a selection result; And
One first buffer amplifier is coupled to this selector switch, is used for cushioning this selection result, to produce this corresponding source drive signal.
4. drive unit as claimed in claim 1, wherein this voltage generator includes:
One multiplexer is coupled to a high common voltage and a low common voltage, is used for according to this transition periodic signal, periodically selects this high common voltage maybe should hang down common voltage, switches signal to produce one; And
One second buffer amplifier is coupled to this multiplexer, is used for cushioning this switching signal, to produce this shared signal.
5. drive unit as claimed in claim 4 should low common voltage be a ground voltage wherein.
6. drive unit as claimed in claim 1, wherein this each source electrode driver compensates this flicker amplitude when this flicker amplitude of this compensation indication signal exceeds a normal value.
7. display device includes:
One display panels includes:
One substrate; And
A plurality of pixel cells are arranged on this substrate with matrix-style;
One color analyzer is coupled to this display panels, is used for measuring the flicker amplitude of these a plurality of pixel cells, to produce a compensation indicator signal;
Time schedule controller is used for receiving view data, to produce a picture signal and a transition periodic signal; And
One drive unit is used for driving this display panels, includes:
One gate drivers is coupled to this a plurality of pixel cells, is used for producing a plurality of sweep signals, and each sweep signal is used for driving this pixel cell that one of this display panels lists;
One voltage generator is coupled to this substrate and this time schedule controller, is used for according to this transition periodic signal, provides a non-negative shared signal to this substrate; And
The one source pole driver, be coupled to this color analysis device, this time schedule controller and this display panels, be used for according to this compensation indicator signal, this picture signal and this transition periodic signal, produce a plurality of source electrode drive signals, each source drive signal is used for driving this pixel cell in the delegation of this display panels.
8. display device as claimed in claim 7, wherein this source electrode driver includes:
One compensating controller is coupled to this color analysis device, is used for according to this compensation indicator signal, produces one first bias voltage signal and one second bias voltage signal;
One noble potential voltage stabilizer is coupled to this compensating controller, is used for according to this first bias voltage signal, adjusts and stablizes a high-potential voltage;
One electronegative potential voltage stabilizer is coupled to this compensating controller, is used for according to this second bias voltage signal, adjusts and stablizes a low-potential voltage; And
A plurality of gamma electric voltage producers, each gamma electric voltage producer is coupled to this noble potential voltage stabilizer, this electronegative potential voltage stabilizer and this time schedule controller, be used for producing this corresponding source drive signal according to a corresponding pixel content signal in this high-potential voltage, this low-potential voltage, this transition periodic signal and this picture signal.
9. display device as claimed in claim 8, wherein this each gamma electric voltage producer includes:
One bleeder circuit is coupled to this noble potential voltage stabilizer and this electronegative potential voltage stabilizer, is used for producing a plurality of branch pressure voltages according to this high-potential voltage and this low-potential voltage;
One selector switch is coupled to this bleeder circuit and this time schedule controller, is used for according to this pixel content signal and this transition periodic signal, periodically selects a branch pressure voltage from these a plurality of branch pressure voltages, to produce a selection result; And
One first buffer amplifier is coupled to this selector switch, is used for cushioning this selection result, to produce this corresponding source drive signal.
10. display device as claimed in claim 7, wherein this voltage generator includes:
One multiplexer is coupled to a high common voltage and a low common voltage, is used for according to this transition periodic signal, periodically selects this high common voltage maybe should hang down common voltage, switches signal to produce one; And
One second buffer amplifier is coupled to this multiplexer, is used for cushioning this switching signal, to produce this shared signal.
11. display device as claimed in claim 10 should low common voltage be a ground voltage wherein.
12. display device as claimed in claim 7, wherein this each source electrode driver compensates this flicker amplitude when this flicker amplitude of this compensation indication signal exceeds a normal value.
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| CN107886912B (en) * | 2016-09-30 | 2020-07-21 | 乐金显示有限公司 | Display device and driving method thereof |
| CN108269532A (en) * | 2018-01-19 | 2018-07-10 | 友达光电股份有限公司 | Display device |
| CN110070835A (en) * | 2018-01-22 | 2019-07-30 | 矽创电子股份有限公司 | Electronic paper display driving circuit |
| CN110070835B (en) * | 2018-01-22 | 2021-05-28 | 矽创电子股份有限公司 | Electronic paper display driving circuit |
| WO2021208483A1 (en) * | 2020-04-17 | 2021-10-21 | 广州视源电子科技股份有限公司 | Driving method and apparatus for led display screen, system, device, and storage medium |
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Application publication date: 20110413 |