CN1658275A - Gamma voltage generator liquid crystal display and control method for liquid crystal device - Google Patents

Gamma voltage generator liquid crystal display and control method for liquid crystal device Download PDF

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Publication number
CN1658275A
CN1658275A CN 200510063816 CN200510063816A CN1658275A CN 1658275 A CN1658275 A CN 1658275A CN 200510063816 CN200510063816 CN 200510063816 CN 200510063816 A CN200510063816 A CN 200510063816A CN 1658275 A CN1658275 A CN 1658275A
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gamma voltage
bleeder circuit
time
liquid crystal
colored pixels
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CN100414594C (en
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施鸿民
蔡宗光
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AU Optronics Corp
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AU Optronics Corp
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Abstract

This invention is a LCD Gamma voltage producer to control the brightness of the first color and the second color pixel units, this voltage producer includes: the first bleeder circuit, and at least the second bleeder circuit. The first bleeder circuit is coupled between the first and the second nodes, and produces the first main Gamma voltage. The second bleeder circuit is coupled between the first and the second nodes, the produces the sub-Gamma voltage and the second sub-Gamma voltage. The first main Gamma voltage and the first sub-Gamma voltage control the brightness of the first color pixel unit, the first main Gamma voltage and the second sub-Gamma voltage control the brightness of the second color pixel unit.

Description

The control method of gamma voltage generator, LCD and liquid crystal indicator
Technical field
The present invention relates to a kind of voltage generator, particularly relevant for liquid crystal gamma (Gamma) voltage generator in a kind of LCD.
Background technology
The Gamma potential circuit is LCD (the Liquid CrystalDisplay that is applied to general active-matrix; Hereinafter to be referred as LCD) in, major function provides digitally encoded signal conversion, the view data of being imported is done a suitable curve adjustment,, just can adjust brightness, GTG, contrast and the color representation of LCD with respect to the family curve of LCD by this conversion diagram.
Fig. 1 a shows the relation of the voltage of LCD with respect to display characteristic (T).Wherein, T can be penetrance, brightness, GTG, contrast and color representation etc.Fig. 1 b and 1c are the desired desirable display image performance diagram that reaches.Yet obtain the family curve of Fig. 1 b or 1c, still need and want one to adjust mechanism and be input to the compensation external data that the characteristic because of LCD itself makes the right change of being done behind the LCD.This adjustment mechanism promptly is the Gamma potential circuit.Fig. 1 d is the transformation curve of general Gamma potential circuit, is the relation of GTG (Gray level) with respect to voltage shown in the figure.
At general twisted nematic (Twisted Nematic; TN) LCD, the penetrance of liquid crystal material itself is a nonlinear curve with respect to the family curve that applies voltage, therefore, and in the Gamma potential circuit, if it is many more that the reference voltage that can provide is counted, then the approximate error of this characteristic song is then accurate more relatively.
Can provide 256 GTGs, 8 potential source drivers with one is example, these 256 GTGs be done best adjustment, is to provide 256 reference voltages that can modulate to adjust by the outside, and need adjusts one by one.But,, therefore, need the reference voltage of 512 outside inputs to adjust altogether so need each 256 reference voltage point of positive-negative polarity because the driving voltage of liquid crystal material is required to be AC characteristic.Will make so many reference voltage input terminals in this case on a drive IC is a quite unpractical practice.
In general design, be to provide minority limited reference voltage input terminal from the outside, and in the electric resistance partial pressure mode of this drive IC indoor design one fixed proportion, count minute to extrude needed reference voltage.Fig. 2 shows existing Gamma potential circuit.The general data driver needs the Gamma voltage input of one group of voltage center's symmetry, this center voltage V COM=(V CC+ V GND)/2.Input voltage V CCAnd V GNDAfter liquid crystal Gamma voltage generator 20 dividing potential drops, obtain a plurality of voltage division signal.Utilize the just display brightness characteristic (T) of may command LCD of these voltage division signal.
Each pixel is made up of three colored pixels unit R, G, B, utilizes as the voltage division signal that Fig. 2 produced the brightness of controllable colour pixel cell.Because the colored pixels unit R GB in the same pixel is controlled by same voltage division signal all, so can't proofread and correct at the individual colors pixel cell.Therefore, easily cause picture element module can't present required color fully.
For head it off, another existing Gamma potential circuit has as shown in Figure 3 been proposed just.Available liquid crystal Gamma voltage generator 30 has three resistance string 32,34,36, and wherein, the voltage division signal that resistance string 32 is produced is in order to the colored pixels unit R in the control picture element module; The voltage division signal that resistance string 34 is produced is in order to the colored pixels unit G in the control picture element module; The voltage division signal that resistance string 36 is produced is in order to the colored pixels unit B in the control picture element module.So, though can make that color is complete presents, liquid crystal Gamma voltage generator 30 employed resistance numbers are 3 times for liquid crystal Gamma voltage generator 20, not only increase cost widely, and, also suitable big in the shared Layout space of liquid crystal Gamma voltage generator 30.
Summary of the invention
The invention provides a kind of liquid crystal Gamma voltage generator, in order to control the brightness of one first color and the second colored pixels unit, this liquid crystal Gamma voltage generator comprises: one first bleeder circuit and at least one second bleeder circuit.First bleeder circuit is coupled between a first node and the Section Point, and produces one first main Gamma voltage (main-gamma voltage).Second bleeder circuit is coupled between this Section Point and one the 3rd node, to produce Gamma voltage (sub-gamma voltage) and one a Gamma voltage for the second time for the first time.This first main Gamma voltage and this first time Gamma voltage be in order to controlling the brightness of this first colored pixels unit, this first main Gamma voltage and this second time Gamma voltage be in order to control the brightness of this second colored pixels unit.
The present invention provides a kind of liquid crystal indicator in addition, comprises at least: a display panel, a gate drivers and a data driver.Display panel has first and second colored pixels unit, connects corresponding a data electrode and a plurality of gate electrode respectively.Gate drivers output scanning signal is to pairing gate electrode.Data driver has above-mentioned liquid crystal Gamma voltage generator, in order to outputting video signal to this data electrode, to control the brightness of this first and second colored pixels unit
The present invention more provides a kind of control mode, in order to control above-mentioned liquid crystal indicator.At first, select a pixel cell.When a selected pixel cell is this first colored pixels unit, export this first main Gamma voltage and this first time Gamma voltage one of them, and control the brightness of this selected pixel cell.When a selected pixel cell is this second colored pixels unit, export this first main Gamma voltage and this second time Gamma voltage one of them, and control the brightness of this selected pixel cell.
For above and other objects of the present invention, feature and advantage can be become apparent, cited below particularlyly go out preferred embodiment, and conjunction with figs., be described in detail below.
Description of drawings
Fig. 1 a shows the relation of the voltage of LCD with respect to display characteristic (T).
Fig. 1 b is the relation of GTG (Gray Level) with respect to the display characteristic (T) of LCD.
Fig. 1 c is desirable display image performance diagram
Fig. 1 d is the transformation curve of general Gamma potential circuit
Fig. 2 shows existing Gamma potential circuit.
Fig. 3 shows another existing Gamma potential circuit.
Fig. 4 a, 4b show that one of liquid crystal Gamma voltage generator of the present invention may embodiment.
Fig. 5 shows the inside calcspar of LCD of the present invention.
Fig. 6 shows the transformation curve of Gamma potential circuit of the present invention.
Fig. 7 a, 7b show that second of liquid crystal Gamma voltage generator of the present invention may embodiment.
Fig. 8-10 figure shows other embodiment of liquid crystal Gamma voltage generator of the present invention.
The reference numeral explanation
20,30,40,70: liquid crystal Gamma voltage generator;
32,34,36: resistance string;
41-44,71-74,81-86,91-98,101-110: divide piezoelectricity respectively;
411-413,432-438,442-448,452-458,461-463: resistance;
430,440,450,730,740: inferior bleeder circuit;
431,441,451: switch;
51: display panel;
52: gate drivers;
53: data driver; 54: time controller;
510: picture element module;
510R, 510B, 510G: colored pixels unit;
531: shift register; 532: sample-and-hold circuit;
The 533:D/A converter; 534: amplifying circuit.
Embodiment
Fig. 4 a, 4b show that one of liquid crystal Gamma voltage generator of the present invention may embodiment.As shown in the figure, liquid crystal Gamma voltage generator 40 comprises bleeder circuit 41-44.Bleeder circuit 41 is coupled to node P 1And P 2Between, bleeder circuit 42 is coupled to node P 2And P 3Between, bleeder circuit 43 is coupled to node P 3And P 4Between, bleeder circuit 44 is coupled to node P 4And P 5Between.
Bleeder circuit 41 and 44 is in order to produce equal and opposite in direction but opposite polarity main Gamma voltage (main-gamma voltage), and the main Gamma voltage that it produced is in order to represent the high gray value.Because the structure of bleeder circuit 41,44 is identical, thus below be example only with bleeder circuit 41.
Bleeder circuit 42 and 43 is in order to the generation equal and opposite in direction but opposite polarity Gamma voltage (sub-gamma voltage), and the inferior Gamma voltage that it produced is in order to low GTG value in the representative.Because bleeder circuit 42 and 43 characteristic are identical, for convenience of description, below be example only with bleeder circuit 42.
Bleeder circuit 41,42 can be made of other assembly, is to be example with resistance at this.In the present embodiment, bleeder circuit 41 is to be in series by resistance 411-413.Utilize the characteristic of electric resistance partial pressure, will be between two resistance resulting voltage division signal, as main Gamma voltage GMA 1-GMA 3
Because the main Gamma voltage GMA that bleeder circuit 41 is produced 1-GMA 3Be to represent the high gray value, so when a certain selecteed picture element module was desired to present high gray, then the colored pixels unit R BG in this picture element module was controlled by same main Gamma voltage all can.
And bleeder circuit 42 has the inferior bleeder circuit 430-450 of mutual parallel connection.Inferior bleeder circuit 430 is to be in series by switch 431 and resistance 432-437, and by control signal CTR 1Whether the conducting of determine switch 431.As node P 1And P 4Receive power supply respectively, and during switch 431 short circuits, the voltage division signal that is produced between resistance 432-437 then is respectively as time Gamma voltage GMA 4R-GMA 8R
Inferior bleeder circuit 440 is to be in series by switch 441 and resistance 442-447, and by control signal CTR 2Whether the conducting of determine switch 441.As node P 1And P 4Receive power supply V respectively 1And V 2, and during switch 441 short circuits, the voltage division signal that is produced between resistance 442-447 then is as inferior Gamma voltage GMA 4B-GMA 8B
Inferior bleeder circuit 450 is to be in series by switch 451 and resistance 452-457, and by control signal CTR 3Whether the conducting of determine switch 451.As node P 1And P 4Receive power supply V respectively 1And V 2, and during switch 451 short circuits, the voltage division signal that is produced between resistance 452-457 then is as inferior Gamma voltage GMA 4G-GMA 8G
Also can be with seasonal CTR 1CTR 2CTR 3All times of conducting Gamma voltage.Because inferior Gamma voltage that produced of bleeder circuit 42 is low GTG in the representative, so when hanging down GTG in a certain picture element module is desired to present, then the brightness of the colored pixels unit R in this picture element module is the inferior Gamma voltage GMA that is produced by inferior bleeder circuit 430 4R-GMA 8RControl; The brightness of colored pixels unit B is the inferior Gamma voltage GMA that is produced by inferior bleeder circuit 440 4B-GMA 8BControl; The brightness of colored pixels unit G is the inferior Gamma voltage GMA that is produced by inferior bleeder circuit 450 4G-GMA 8GControl.In addition, also a plurality of bleeder circuits 42 can be connected in parallel, different bleeder circuits have the resistance string of different resistances, to produce different inferior Gamma voltage.Fig. 5 shows the inside calcspar of LCD of the present invention.As shown in the figure, LCD comprises, display panel 51, gate drivers 52, data driver 53 and time controller 54.Display panel 51 is by crisscross data electrode D 1-D mWith with gate electrode G 1-G nBe interwoven.Staggered data electrode and the gate electrode of each group can be used for controlling a picture element module.Because each picture element module all has three colored pixels unit,
Therefore, when the arrangement mode of the colored pixels unit on the display panel 51 as shown in Figure 5 the time, then each gate electrode need have gate electrodes three times.With picture element module 510 is example, data electrode D 1With inferior gate electrode G 1RCan be used for controlling colored pixels unit 510R; Data electrode D 1With inferior gate electrode G 1GCan be used for controlling colored pixels unit 510G; Data electrode D 1With inferior gate electrode G 1BCan be used for controlling colored pixels unit 510B.
Time controller 54 driving grid drivers 52 make gate drivers 52 output scanning signals, and by gate electrode G 1-G n, in order to the same all colours pixel cell that lists of conducting/close.
Data driver 53 comprises, shift register 531, sample-and-hold circuit 532, D/A (digital simulation) converter 533, amplifying circuit 534 and liquid crystal Gamma voltage generator 40.When a certain gate electrode was selected, then time controller 54 was sent horizontal-drive signal HS and clock signal HCLK gives shift register 531.Shift register 531 is according to clock signal HCLK level of displacement synchronizing signal, and with the horizontal-drive signal after the displacement as a latch-up signal, provide and give sample-and-hold circuit 532.
532 pairs of sample-and-hold circuits are desired to provide and are given data electrode D 1-D mPicture signal R, B, G take a sample, and according to latch-up signal, keep the picture signal of residence sampling.
D/A converter 533 receives the picture signal that sample-and-hold circuits 532 are exported, and the Gamma voltage GMA that is provided at liquid crystal Gamma voltage generator 40 1-GMA 18In, obtain the pairing Gamma voltage of this picture signal, in order to convert picture signal R, B, G to simulating signal.
After picture signal R, B, the G that amplifying circuit 534 will be converted into simulating signal amplifies, export pairing data electrode to, in order to control the brightness of corresponding colored pixels module.
Because data driver 53 has the liquid crystal Gamma voltage generator 40 shown in Fig. 4 a, 4b, therefore, when in picture element module 510 is desired to present, hanging down GTG, then liquid crystal Gamma voltage generator 40 can provide different Gamma voltage, give colored pixels unit 510R, 510G, the 510B of this picture element module 510, make it present different brightness.When picture element module 510 was desired to present high gray, then liquid crystal Gamma voltage generator 40 can provide single Gamma voltage, gave colored pixels unit 510R, 510G, the 510B of this picture element module 510, made it present identical brightness.
The Gamma voltage GMA that please cooperate the liquid crystal Gamma voltage generator of Fig. 4 a, 4b to be exported 1-GMA 8, will be example below with picture element module 510, the control method of LCD is described.
Select the colored pixels unit in the picture element module 510 at first, earlier.When colored pixels unit 510R is selected, then export Gamma voltage GMA 1Or inferior Gamma voltage GMA 4RGive colored pixels unit 510R, with the brightness of control colored pixels unit 510R.
When colored pixels unit 510G is selected, then export main Gamma voltage GMA 1, or inferior Gamma voltage GMA 4GGive colored pixels unit 510G, with the brightness of control colored pixels unit 510G.
Fig. 6 shows the transformation curve of the liquid crystal Gamma voltage generator shown in Fig. 4 a, 4b.Please arrange in pairs or groups Fig. 4 a, 4b suppose node P 1And P 3Receive power supply signal V respectively 1, V 2, and switch 431,441,451 then can obtain transformation curve as shown in Figure 6 when being short-circuit condition.
Fig. 7 a, 7b show second embodiment of liquid crystal Gamma voltage generator of the present invention.Liquid crystal Gamma voltage generator 70 is similar in appearance to liquid crystal Gamma voltage generator 40, and difference is that liquid crystal Gamma voltage generator 70 utilizes bleeder circuit 730 and 740 two times, produces time Gamma voltage and gives pixel cell R, B, G.In addition, also controllable colour pixel cell R, B or G of the inferior Gamma voltage that produced of inferior bleeder circuit 730 and 740.
In the present embodiment, the inferior Gamma voltage GMA that produced of inferior bleeder circuit 730 4R-GMA 8RBe in order to control colored pixels unit R, and the inferior Gamma voltage GMA that inferior bleeder circuit 740 is produced 4BG-GMA 8BGBe in order to control colored pixels unit B, G.
In addition, the switch in inferior bleeder circuit 730 is according to control signal CTR 1, the inferior Gamma voltage GMA whether decision produces 4R-GMA 8RBrightness with control colored pixels unit R.When switch is open-circuit condition, then can't produce time Gamma voltage GMA 4R-GMA 8RBrightness with control colored pixels unit R.Because time bleeder circuit 740 does not have switch module, so as long as node P 1And P 4Have power supply signal, then can produce time Gamma voltage GMA 4BG-GMA 8BG, with the brightness of control colored pixels unit B, G.
The present invention does not limit the arrangement mode of the bleeder circuit in the liquid crystal Gamna voltage generator.Fig. 8-10 shows other embodiment of liquid crystal Gamma voltage generator of the present invention.For convenience of description, each bleeder circuit in Fig. 8-10 figure is made up of two resistors.
In Fig. 8, be reflection spot (mirror point) with node A.The Gamma voltage that bleeder circuit 81-83 more than node A is produced, the Gamma voltage with bleeder circuit 84-86 below the node A is produced has the opposite polarity relation of equal and opposite in direction.
In Fig. 9, be reflection spot with the Node B.The Gamma voltage that bleeder circuit 91-94 more than Node B is produced, the Gamma voltage with bleeder circuit 95-98 below the Node B is produced has the opposite polarity relation of equal and opposite in direction.
In Figure 10, be reflection spot with node C.The Gamma voltage that bleeder circuit 101-105 more than node C is produced, the Gamma voltage with bleeder circuit 106-110 below the node C is produced has the opposite polarity relation of equal and opposite in direction.
In sum, liquid crystal Gamma voltage generator of the present invention can provide different Gamma voltage to give to desire colored pixels unit R, B, the G in the picture element module that presents the high gray value.And desire to present low GTG value when picture element module, liquid crystal Gamma voltage generator of the present invention provides single Gamma voltage to give colored pixels unit R, B, G.Therefore, liquid crystal Gamma voltage generator of the present invention not only can increase the quality that presents of LCD, and, can significantly not increase the cost of assembly.
In addition, liquid crystal Gamma voltage generator of the present invention also can provide different Gamma voltage to give to desire colored pixels unit R, B, the G in the picture element module that presents low GTG value.And when picture element module desires to present the high gray value, liquid crystal Gamma voltage generator of the present invention provides single Gamma voltage to give colored pixels unit R, B, G.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.

Claims (13)

1. liquid crystal gamma voltage generator, in order to control the brightness of one first color and the second colored pixels unit, this liquid crystal gamma voltage generator comprises:
One first bleeder circuit is coupled between a first node and the Section Point, and produces one first main gamma voltage; And
At least one second bleeder circuit is coupled between this Section Point and one the 3rd node, and this second bleeder circuit generation gamma voltage one first time and one is gamma voltage for the second time;
Wherein, this first main gamma voltage and this first time gamma voltage be in order to controlling the brightness of this first colored pixels unit, this first main gamma voltage and this second time gamma voltage be in order to control the brightness of this second colored pixels unit.
2. liquid crystal gamma voltage generator as claimed in claim 1, wherein, this second bleeder circuit comprises:
One bleeder circuit for the first time is coupled between this Section Point and the 3rd node, in order to produce this of gamma voltage first time; And
One bleeder circuit for the second time, bleeder circuit for the first time in parallel is coupled between this Section Point and the 3rd node, in order to produce this of gamma voltage second time.
3. liquid crystal gamma voltage generator as claimed in claim 2, wherein, one of them comprises a plurality of resistance of series connection this first and second bleeder circuit.
4. liquid crystal gamma voltage generator as claimed in claim 2, wherein, one of them includes this first and second bleeder circuit:
A plurality of resistance; And
One switch;
Wherein, this constant resistance is to be in series with this switch, and this switch can determine whether the inferior bleeder circuit of a correspondence is enabled.
5. liquid crystal gamma voltage generator as claimed in claim 2, wherein, this second bleeder circuit includes a bleeder circuit for the third time in addition, bleeder circuit for the first time in parallel, be coupled between this Section Point and the 3rd node, in order to produce a gamma voltage for the third time, this first main gamma voltage and this gamma voltage for the third time are in order to control the brightness of one the 3rd colored pixels unit.
6. liquid crystal gamma voltage generator as claimed in claim 1, wherein, this liquid crystal gamma voltage generator is more in order to controlling the brightness of one the 3rd colored pixels unit, this first main gamma voltage and this first time gamma voltage be in order to control the brightness of this first and the 3rd colored pixels unit.
7. liquid crystal indicator comprises at least:
One display panel has first and second colored pixels unit, connects corresponding a data electrode and a plurality of gate electrode respectively;
One gate drivers, the output scanning signal is to pairing gate electrode; And
One data driver, outputting video signal are to this data electrode, and in order to control the brightness of this first and second colored pixels unit, this data driver comprises:
One first bleeder circuit is coupled between a first node and the Section Point, and produces one first main gamma voltage; And
At least one second bleeder circuit is coupled between this Section Point and one the 3rd node, and this second bleeder circuit generation gamma voltage one first time and one is gamma voltage for the second time;
Wherein, this first main gamma voltage and this first time gamma voltage be in order to controlling the brightness of this first colored pixels unit, this first main gamma voltage and this second time gamma voltage be in order to control the brightness of this second colored pixels unit.
8. liquid crystal indicator as claimed in claim 7, wherein, this second bleeder circuit comprises:
One bleeder circuit for the first time is coupled between this Section Point and the 3rd node, in order to produce this of gamma voltage first time; And
One bleeder circuit for the second time, bleeder circuit for the first time in parallel is coupled between this Section Point and the 3rd node, in order to produce this of gamma voltage second time.
9. liquid crystal indicator as claimed in claim 8, wherein, one of them comprises a plurality of resistance of series connection this first and second bleeder circuit.
10. liquid crystal indicator as claimed in claim 8, wherein, one of them includes this first and second bleeder circuit:
A plurality of resistance; And
One switch;
Wherein, this constant resistance is to be in series with this switch, and this switch can determine whether the inferior bleeder circuit of a correspondence is enabled.
11. liquid crystal indicator as claimed in claim 8, wherein, this second bleeder circuit includes a bleeder circuit for the third time in addition, bleeder circuit for the first time in parallel, be coupled between this Section Point and the 3rd node, in order to produce a gamma voltage for the third time, this first main gamma voltage and this gamma voltage for the third time are in order to control the brightness of one the 3rd colored pixels unit.
12. liquid crystal indicator as claimed in claim 7, wherein, this data driver is more in order to controlling the brightness of one the 3rd colored pixels unit, this first main gamma voltage and this first time gamma voltage be in order to control the brightness of this first and the 3rd colored pixels unit.
13. the control method of a liquid crystal indicator, this liquid crystal indicator includes:
One display panel has first and second colored pixels unit, connects corresponding a data electrode and a plurality of gate electrode respectively, and
A kind of liquid crystal gamma voltage generator, the brightness of this first color of may command and the second colored pixels unit, this liquid crystal gamma voltage generator comprises:
One first bleeder circuit is coupled between a first node and the Section Point, and produces one first main gamma voltage; And
At least one second bleeder circuit is coupled between this Section Point and one the 3rd node, and this second bleeder circuit generation gamma voltage gamma one first time and one is gamma voltage for the second time;
This control method includes:
Select a pixel cell;
When a selected pixel cell is this first colored pixels unit, export this first main gamma voltage and this first time gamma voltage one of them, and control the brightness of this selected pixel cell; And
When a selected pixel cell is this second colored pixels unit, export this first main gamma voltage and this second time gamma voltage one of them, and control the brightness of this selected pixel cell.
CNB200510063816XA 2005-04-07 2005-04-07 Gamma voltage generator liquid crystal display and control method for liquid crystal device Expired - Fee Related CN100414594C (en)

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CN105355177B (en) * 2015-12-02 2018-07-03 深圳市华星光电技术有限公司 Liquid crystal display and the method for improving its ghost phenomena
CN108630161A (en) * 2018-03-20 2018-10-09 友达光电股份有限公司 Voltage supply circuit and control circuit
CN110379396A (en) * 2019-06-17 2019-10-25 北京集创北方科技股份有限公司 Gamma electric voltage production method, generation circuit, source electrode drive circuit, driving chip and display device
CN110379396B (en) * 2019-06-17 2022-03-25 北京集创北方科技股份有限公司 Gamma voltage generation method, generation circuit, source electrode driving circuit, driving chip and display device

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