CN101826307B - Generating circuit and generating method for Gamma reference voltage - Google Patents
Generating circuit and generating method for Gamma reference voltage Download PDFInfo
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- CN101826307B CN101826307B CN2009100797111A CN200910079711A CN101826307B CN 101826307 B CN101826307 B CN 101826307B CN 2009100797111 A CN2009100797111 A CN 2009100797111A CN 200910079711 A CN200910079711 A CN 200910079711A CN 101826307 B CN101826307 B CN 101826307B
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Abstract
The embodiment of the invention discloses a generating circuit and a generating method for a Gamma reference voltage, relates to the field of manufacturing of the liquid crystal display and can solve the problem of high power consumption of a drive circuit in the prior art. The generating circuit for the Gamma reference voltage comprises a first voltage division circuit; and the first voltage division circuit outputs the Gamma reference voltage from each voltage output point under the mutual action of a first positive DC voltage and a first negative DC voltage. The generating method for the Gamma reference voltage comprises a step of outputting the Gamma reference voltage through the first voltage division circuit under the mutual action of the first positive DC voltage and the first negative DC voltage. The generating circuit and the generating method are suitable for the manufacturing of the liquid crystal display.
Description
Technical field
The present invention relates to LCD and make the field, relate in particular to a kind of generation circuit and production method of Gamma reference voltage.
Background technology
Have a plurality of pixel cells on the display panel of Thin Film Transistor-LCD, each pixel cell has redness, green and blue three sub-pixs.The brightness that each sub-pix appeared is determined by Gamma (gamma) reference voltage.
The effect of Gamma generating circuit from reference voltage is according to the desired Gamma curve of LCD, sets the Gamma reference voltage, carries out the reference voltage that gray scale shows as Thin Film Transistor-LCD.Each Gamma reference voltage is input in the source electrode driver of Thin Film Transistor-LCD, and the digital to analog converter through in the source electrode driver produces all grayscale voltages.
Definite method of Gamma reference voltage is following: gray scale and transmittance curve through liquid crystal display panel of thin film transistor simulate desired Gamma curve; Again according to voltage-transmitance (V-T) curve of liquid crystal material, through calculating each Gamma reference voltage.Obtain just can adopting the Gamma generating circuit from reference voltage to produce these Gamma reference voltages behind the Gamma reference voltage, offer source electrode driver and realize that signal drives.
In the driving of LCD, need driving circuit that ac drive voltage is provided, thereby make liquid crystal molecule deflection in the opposite direction, in case solution stopping is brilliant aging.The design of drive circuit of present LCD; Normally by AVDD (aanalogvoltage; Generally about 12V) generation benchmark Gamma reference voltage; And be power supply with AVDD, according to Gamma reference voltage and data-signal the driving voltage that outputs to the pixel electrode on the display panels is provided by source electrode driver.Usually, the Gamma reference voltage is a forward voltage, and the occurrence of public electrode voltages Vcom can be regulated according to the AVDD current potential.Most LCD reaches the positive and negative purpose to driving to liquid crystal molecule by the way in the prior art at present.
Shown in Figure 1 is the generation circuit of the Gamma reference voltage in the present LCD circuit.By the one group voltage of AVDD between electric resistance partial pressure produces from 0V to AVDD, as benchmark Gamma reference voltage.Usually total N+1 resistance in the bleeder circuit, i.e. R0～RN, it is individual that the Gamma reference electrode of generation is pressed with N, i.e. GMA1～GMAN.In the prior art with the corresponding Vcom voltage of benchmark Gamma reference voltage about 5V.
Present LCD, the driving voltage current potential that is used for the driving pixels electrode is higher, thereby corresponding Vcom current potential is also higher.Overall, the drive circuit power consumption of present LCD is bigger.
Summary of the invention
The present invention provides a kind of generation circuit and production method of Gamma reference voltage, can solve the bigger problem of the power consumption of driving circuit in the prior art.
For achieving the above object, the present invention adopts following technical scheme:
A kind of generation circuit of Gamma reference voltage comprises first bleeder circuit, and said first bleeder circuit is exported the Gamma reference voltage from each voltage output point under the acting in conjunction of the first positive polarity DC voltage and the first negative polarity DC voltage.
First bleeder circuit in the generation circuit of Gamma reference voltage of the present invention; Each voltage output point from first bleeder circuit under the acting in conjunction of the first positive polarity DC voltage and the first negative polarity DC voltage is exported the Gamma reference voltage; Realized positive and negative output to the Gamma reference voltage; Can reduce liquid crystal display common electrode voltage, thereby reduce the power consumption of LCD.
The present invention also provides a kind of production method of Gamma reference voltage, can solve the bigger problem of the power consumption of driving circuit in the prior art.
The production method of a kind of Gamma reference voltage provided by the invention comprises:
Under the acting in conjunction of the first positive polarity DC voltage and the first negative polarity DC voltage, through first bleeder circuit output Gamma reference voltage.
The production method of Gamma reference voltage of the present invention; Acting in conjunction through the first positive polarity DC voltage and the first negative polarity DC voltage, utilize first bleeder circuit output Gamma reference voltage; Realized positive and negative output to the Gamma reference voltage; Can reduce liquid crystal display common electrode voltage, thereby reduce the power consumption of LCD.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the synoptic diagram of the generation circuit of prior art Gamma reference voltage;
Fig. 2 is the synoptic diagram of the generation circuit of one embodiment of the invention Gamma reference voltage;
Fig. 3 is the synoptic diagram of the generation circuit of another embodiment of the present invention Gamma reference voltage;
Fig. 4 is the generation circuit of negative polarity DC voltage in the embodiments of the invention;
Fig. 5 is the process flow diagram of the production method of embodiments of the invention Gamma reference voltage.
Description of reference numerals:
100, the first bleeder circuits; 200, mu balanced circuit; 210, the second bleeder circuits; 220, feedback amplifier.
Embodiment
Be described in detail below in conjunction with the generation circuit and the production method of accompanying drawing embodiments of the invention Gamma reference voltage.
Should be clear and definite, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
With reference to Fig. 2; The generation circuit of a kind of Gamma reference voltage that embodiments of the invention provide; Comprise first bleeder circuit; From each voltage output point C1, C2......C14 exports Gamma reference voltage GMA1, GMA2......GMA14 to said first bleeder circuit under the acting in conjunction of the first positive polarity DC voltage VDD1 and the first negative polarity DC voltage NVDD1.
First bleeder circuit in the generation circuit of embodiments of the invention Gamma reference voltage; Under the acting in conjunction of the first positive polarity DC voltage and the first negative polarity DC voltage, export the Gamma reference voltage through first bleeder circuit from each voltage output point; Realized positive and negative output to the Gamma reference voltage; Can reduce liquid crystal display common electrode voltage, thereby reduce the power consumption of LCD.
Said first bleeder circuit can be the resistor voltage divider circuit described in Fig. 2, and the resistance size of each resistance R 0～R15 can be selected according to the value size of each required Gamma reference voltage of LCD.
On the basis of such scheme, in other embodiments of the invention, the said first positive polarity DC voltage VDD1 and the first negative polarity DC voltage NVDD1 absolute value equate.In suc scheme, select suitable divider resistance R0～R15, make that the Gamma reference voltage GAM1～GAM7 of output and GAM14～GAM8 are symmetrical about voltage zero.Thereby can Vcom be arranged near zero, thereby can reduce the power consumption of liquid crystal display drive circuit significantly.
As shown in Figure 3, the generation circuit of a kind of Gamma reference voltage that another embodiment of the present invention provides comprises: the mu balanced circuit 200 and first bleeder circuit 100; Said mu balanced circuit 200 is used to export at least one first voltage, is used for keeping the magnitude of voltage of said at least one voltage input point of first bleeder circuit constant; Said first bleeder circuit 100 is used under the control of said at least one first voltage from each voltage output point output Gamma reference voltage; Wherein, said mu balanced circuit 200 produces said at least one first voltage under the acting in conjunction of the second positive polarity DC voltage VDD2 and the second negative polarity DC voltage NVDD2; Said first bleeder circuit 100 is exported the Gamma reference voltage from each voltage output point under the acting in conjunction of said at least one first voltage, the first positive polarity DC voltage VDD1 and the first negative polarity DC voltage NVDD1.
The generation circuit of embodiments of the invention Gamma reference voltage; Through exporting at least one first voltage by the second positive polarity DC voltage and the coefficient mu balanced circuit of the second negative polarity DC voltage; And first voltage is input in the voltage input point of first bleeder circuit, thereby voltage that can the sustaining voltage input point is constant, by the acting in conjunction of first voltage, the first positive polarity DC voltage and the first negative polarity DC voltage; Output Gamma reference voltage from first bleeder circuit; Realized positive and negative output, can reduce liquid crystal display common electrode voltage, thereby reduced the power consumption of LCD to the Gamma reference voltage.Because present embodiment adopts mu balanced circuit that first bleeder circuit is carried out voltage stabilizing, thereby can more stable Gamma magnitude of voltage be provided for LCD, improves the picture display quality.
As shown in Figure 3, on the basis of such scheme, in a preferred embodiment of the present invention, said mu balanced circuit 100 comprises second bleeder circuit 210 and feedback amplifier 220.
Wherein, Said second bleeder circuit 210 is a resistor voltage divider circuit; Comprise at least one voltage output point; Said second bleeder circuit is under the acting in conjunction of the said second positive polarity DC voltage VDD2 and the second negative polarity DC voltage NVDD2, from each at least one second voltage of voltage output point output of said second bleeder circuit 210.For example, second bleeder circuit 210 can comprise four resistance, R16, R17, R18 and R19.The second positive polarity DC voltage VDD2 and the second negative polarity DC voltage NVDD2 are applied to the two ends of second bleeder circuit 210.
Wherein the second positive polarity DC voltage VDD2 can be provided by the inner direct-flow steady voltage VDD2 of liquid crystal display drive circuit, and the second negative polarity DC voltage NVDD2 then can produce circuit through negative polarity DC voltage as shown in Figure 4 and realize.
In the circuit as shown in Figure 4, when field effect pipe Q conducting, just there is input voltage at inductor L two ends, and promptly inductor L charges; At this moment all output currents of sending into load are all from output capacitance C, and promptly capacitor C is in discharge condition; Diode D is back-biased; Current direction in the circuit is A → B, E → C; The voltage V of output
OUTFor negative.Electric current in the inductor continues to increase, till controller is confirmed to turn-off the suitable time of field effect Q.Flow for holding current this moment, and inductor L begins discharge; Capacitor begins charging; Diode D conducting; Current direction in the circuit is A → B, E → C; The voltage V of output
OUTFor negative.
Particularly, the voltage V of input
INValue, can select according to the parameter of inductor L, capacitor C and FET Q in the circuit.And the cycle that the suitable time of above-mentioned controller control shutoff FET Q should discharge and recharge according to the LC loop of inductor L and capacitor C composition is confirmed.In circuit shown in Figure 4, select suitable component parameters, thereby can export the required NVDD2 of Gamma reference circuit.
In the present embodiment, the absolute value of the second positive polarity DC voltage VDD2 and the second negative polarity DC voltage NVDD2 can equate.
Comprise three voltage output point A1, A2 and A3 in second bleeder circuit 210, export three second voltage V1, V2 and V3 respectively and give feedback amplifier 220.
Said feedback amplifier 220 comprises at least one feedback operational amplifier, and said feedback operational amplifier is exported first voltage to said first bleeder circuit 100 according to said second voltage.Among the embodiment shown in Figure 3, comprise three feedback amplifiers in the feedback amplifier 220, AM1, AM2 and AM3.After wherein AM1 feeds back amplification with the second voltage V1 of voltage output point A1 output, export the voltage input point B1 that the first voltage V21 is input to first bleeder circuit; After the second voltage V2 that AM2 exports voltage output point A2 feeds back amplification, export the voltage input point B2 that the first voltage V22 is input to first bleeder circuit 100; After the second voltage V3 that AM3 exports voltage output point A3 feeds back amplification, export the voltage input point B3 that the first voltage V23 is input to first bleeder circuit 100.The first voltage V21, V22 and V23 are used for keeping the magnitude of voltage of said first bleeder circuit, 100 correspondent voltage input point B1, B2 and B3 constant, thereby keep the Gamma reference voltage of first bleeder circuit, 100 outputs stable.The first voltage V22 is input to the magnitude of voltage that first bleeder circuit 100 control, first bleeder circuit 100 is positioned at the voltage input point B2 of voltage midpoint and remains unchanged.The magnitude of voltage of the second voltage V2 is between VDD2 and NVDD2; If VDD2 equates with the absolute value of NVDD2; And the resistance sum of R16, R17 equates with the resistance sum of R18, R19, and then V2, V22 should be zero, thereby voltage that can sustaining voltage input point B2 place is zero.
Embodiments of the invention are not limited thereto, and the resistance of second bleeder circuit 210 is not limited to four, and the number of voltage output point also is not limited to three.
As shown in Figure 3, further, said first bleeder circuit 100 is a resistor voltage divider circuit, comprises at least one voltage input point, and at least one first voltage outputs to each voltage input point of said first bleeder circuit 100; Under the acting in conjunction of each first voltage, the first positive polarity DC voltage VDD1 and the first negative polarity DC voltage NVDD1, from each voltage output point output Gamma reference voltage of said first bleeder circuit 100.
Wherein, the said first negative polarity DC voltage NVDD1 also can adopt negative polarity DC voltage shown in Figure 4 to produce circuit and produce required voltage NVDD1.
Particularly, the order of magnitude of the said first positive polarity DC voltage VDD1 and the first negative polarity DC voltage NVDD1 can equate.For the Gamma voltage that makes output about zero symmetry, then the first voltage V22 of mu balanced circuit 200 outputs is input to the voltage input point B2 of first bleeder circuit, promptly between resistance R 7, the R8, thereby obtain the Gamma reference voltage that is symmetrically distributed about zero.
Embodiments of the invention are not limited thereto, and the Gamma reference voltage of output also can be not in relation to zero symmetry, but about other certain magnitude of voltage symmetry.The second positive polarity DC voltage VDD2 and the second negative polarity DC voltage NVDD2 can equate or be unequal that the first positive polarity DC voltage VDD1 and the first negative polarity DC voltage NVDD1 can equate or be unequal.Particularly can be according to actual each resistance of the corresponding adjustment of Gamma reference voltage that will export and the voltage swing of each direct supply.
The production method of embodiments of the invention Gamma voltage; Can export positive and negative Gamma voltage; Realize positive and negative Gamma driven, thereby public electrode voltages Vcom can drop near 0 volt by about+5V, the power consumption of whole like this source drive part will obviously reduce.Secondly, the input voltage of Gamma buffer (Gamma buffer) is dropped to about 5V by 12V, makes the power consumption of Gamma buffer also will reduce.In addition, the method for positive and negative Gamma driven needs source electrode driver is done corresponding change in design, makes it can realize negative voltage driving, and the digital to analog converter and the output buffers improvement that are about to source electrode driver become the pattern that can support that negative pressure drives.The output potential of digital to analog converter also will reduce, and make the power consumption of source electrode driver reduce, thereby reduce the power consumption of LCD.It should be noted that Vcom needs buffer memory to stablize output equally when realization is of the present invention; To consider also that at PCB (Published Circuit Board, printed wiring board) wiring aspect Vcom is not disturbed by other signals or power supply as far as possible.
Embodiments of the invention also provide a kind of production method of Gamma reference voltage, can solve the bigger problem of the power consumption of driving circuit in the prior art.
The production method of the Gamma reference voltage that embodiments of the invention provide comprises: under the acting in conjunction of the first positive polarity DC voltage and the first negative polarity DC voltage, through first bleeder circuit output Gamma reference voltage.
The production method of Gamma reference voltage of the present invention; Acting in conjunction through the first positive polarity DC voltage and the first negative polarity DC voltage, utilize first bleeder circuit output Gamma reference voltage; Realized positive and negative output to the Gamma reference voltage; Can reduce liquid crystal display common electrode voltage, thereby reduce the power consumption of LCD.
As shown in Figure 5, the production method of a kind of Gamma reference voltage of another embodiment of the present invention comprises:
S501, under the acting in conjunction of the second positive polarity DC voltage and the second negative polarity DC voltage, at least one first voltage that remains unchanged through mu balanced circuit output;
S502, according to the acting in conjunction of said at least one first voltage, the first positive polarity DC voltage and the first negative polarity DC voltage, through first bleeder circuit output Gamma reference voltage; Wherein, said at least one first voltage is used for keeping the magnitude of voltage of said at least one voltage input point of first bleeder circuit constant.
The production method of Gamma reference voltage of the present invention; Acting in conjunction through the second positive polarity DC voltage and the second negative polarity DC voltage produces at least one first voltage; Again according to the acting in conjunction of said at least one first voltage, the first positive polarity DC voltage and the first negative polarity DC voltage; Through first bleeder circuit output Gamma reference voltage; Realized positive and negative output, can reduce liquid crystal display common electrode voltage, thereby reduced the power consumption of LCD to the Gamma reference voltage.
On the basis of the foregoing description, step S501 is specially: under the acting in conjunction of the second positive polarity DC voltage and the second negative polarity DC voltage, through at least one second voltage of second bleeder circuit output; Said at least one second voltage is fed back amplification, at least one first voltage that output remains unchanged.Can realize this step with reference to the circuit arrangement of the mu balanced circuit among Fig. 3 200, concrete implementation can be with reference to the description among the embodiment shown in Figure 3.Said first voltage is used for keeping the magnitude of voltage of the said first bleeder circuit correspondent voltage input point constant, thereby keeps the Gamma reference voltage of first bleeder circuit output constant.
Further, the order of magnitude of the said second positive polarity DC voltage and the second negative polarity DC voltage can equate; The order of magnitude of the said first positive polarity DC voltage and the first negative polarity DC voltage can equate.If the order of magnitude of the second positive polarity DC voltage and the second negative polarity DC voltage equates; And select each resistance of the second suitable bleeder circuit; Make that from the V22 of mu balanced circuit output be zero; And the order of magnitude of the first positive polarity DC voltage and the first negative polarity DC voltage equates, then can export the Gamma reference voltage about zero symmetry from first bleeder circuit.
With reference to embodiment shown in Figure 3; The second positive polarity DC voltage and the first positive polarity DC voltage can be provided by the DC stable power supply VDD in the liquid crystal display drive circuit, and the second negative polarity DC voltage and the first negative polarity DC voltage can be produced by circuit shown in Figure 4.
The production method of embodiments of the invention Gamma voltage can be exported positive and negative Gamma voltage, realizes that positive and negative Gamma drives, and public electrode voltages Vcom can drop near 0 volt by about+5V, and the power consumption of whole source electrode driver will obviously reduce.Secondly, the input voltage of Gamma buffer is dropped to about 5V by 12V, makes the power consumption of Gamma buffer also will reduce.In addition; Realize the method for positive and negative pressure Gamma driven; Need source electrode driver is done corresponding change in design, make it can realize negative voltage driving, the digital to analog converter and the output buffers improvement that are about to source electrode driver become the pattern that can support that negative pressure drives.Thereby the output potential of digital to analog converter also will reduce, and make the power consumption of source electrode driver reduce, thereby reduce the power consumption of LCD.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (9)
1. the generation circuit of a Gamma reference voltage; Comprise first bleeder circuit; It is characterized in that said first bleeder circuit is exported the Gamma reference voltage from each voltage output point under the acting in conjunction of the first positive polarity DC voltage and the first negative polarity DC voltage;
The said first negative polarity DC voltage produces circuit by the negative polarity DC voltage and produces, and said negative polarity DC voltage produces circuit and comprises: FET, inductor, capacitor, diode and controller;
One utmost point of the source electrode of said FET and drain electrode connects input signal, and another utmost point is connected to the negative pole of said diode, and grid connects said controller; The positive pole of said diode is connected to the negative pole of said electric capacity, and negative pole is connected to an end of said inductance; One of said inductance is terminated at the negative pole of said diode, other end ground connection; The plus earth of said electric capacity, negative pole connects output terminal; Said controller one is terminated at the grid of said FET, other end ground connection.
2. the generation circuit of Gamma reference voltage according to claim 1; It is characterized in that; Further comprise mu balanced circuit; Said mu balanced circuit is exported at least one first voltage under the acting in conjunction of the second positive polarity DC voltage and the second negative polarity DC voltage, said first voltage is used for keeping the magnitude of voltage of said at least one voltage input point of first bleeder circuit constant.
3. the generation circuit of Gamma reference voltage according to claim 2 is characterized in that said mu balanced circuit comprises second bleeder circuit and feedback amplifier;
Said second bleeder circuit is a resistor voltage divider circuit; Comprise at least one voltage output point; Said second bleeder circuit is under the acting in conjunction of the said second positive polarity DC voltage and the second negative polarity DC voltage, from each at least one second voltage of voltage output point output of said second bleeder circuit;
Said feedback amplifier comprises at least one feedback operational amplifier, and said feedback operational amplifier is exported said first voltage to said first bleeder circuit according to said second voltage.
4. the generation circuit of Gamma reference voltage according to claim 2 is characterized in that,
The order of magnitude of the said second positive polarity DC voltage and the second negative polarity DC voltage equates.
5. according to the generation circuit of each described Gamma reference voltage in the claim 1 to 4, it is characterized in that,
Said first bleeder circuit is a resistor voltage divider circuit;
The order of magnitude of the said first positive polarity DC voltage and the first negative polarity DC voltage equates.
6. the production method of a Gamma reference voltage is characterized in that, comprising:
Under the acting in conjunction of the first positive polarity DC voltage and the first negative polarity DC voltage, through first bleeder circuit output Gamma reference voltage;
Wherein, the said first negative polarity DC voltage is through the switch of controller control FET and then charging, the discharge generation of control capacitance device and inductor.
7. the production method of Gamma reference voltage according to claim 6 is characterized in that, said method further comprises:
Under the acting in conjunction of the second positive polarity DC voltage and the second negative polarity DC voltage, export at least one first voltage that remains unchanged through mu balanced circuit;
According to said first voltage, keep the magnitude of voltage of at least one voltage input point in said first bleeder circuit constant.
8. the production method of Gamma reference voltage according to claim 7; It is characterized in that; Said under the acting in conjunction of the second positive polarity DC voltage and the second negative polarity DC voltage, at least one first voltage through mu balanced circuit output remains unchanged is specially:
Under the acting in conjunction of the second positive polarity DC voltage and the second negative polarity DC voltage, through at least one second voltage of second bleeder circuit output;
Said at least one second voltage is fed back amplification, at least one first voltage that output remains unchanged.
9. the production method of Gamma reference voltage according to claim 8 is characterized in that,
The order of magnitude of the said second positive polarity DC voltage and the second negative polarity DC voltage equates; The order of magnitude of the said first positive polarity DC voltage and the first negative polarity DC voltage equates.
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| CN102760398B (en) * | 2012-07-03 | 2014-12-10 | 京东方科技集团股份有限公司 | Gamma voltage generating device and method |
| CN103390393B (en) | 2013-07-19 | 2015-11-25 | 深圳市华星光电技术有限公司 | A kind of tune gray voltage production method and device, panel drive circuit and display panel |
| CN104036742B (en) * | 2014-05-26 | 2016-07-20 | 京东方科技集团股份有限公司 | Gamma reference voltage generation circuit, V-T curve method of testing and display device |
| 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 |
| US10872550B2 (en) * | 2019-03-27 | 2020-12-22 | Novatek Microelectronics Corp. | Display driver and displaying method for cascade application |
| CN110085187B (en) * | 2019-05-05 | 2022-04-01 | Tcl华星光电技术有限公司 | Method and device for selecting resistance value of Gamma circuit |
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