CN105590583A - Gray scale voltage generation circuit, generation method, driving circuit and display device - Google Patents

Gray scale voltage generation circuit, generation method, driving circuit and display device Download PDF

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Publication number
CN105590583A
CN105590583A CN201610183414.1A CN201610183414A CN105590583A CN 105590583 A CN105590583 A CN 105590583A CN 201610183414 A CN201610183414 A CN 201610183414A CN 105590583 A CN105590583 A CN 105590583A
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China
Prior art keywords
voltage
bit width
electric current
view data
gray scale
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CN201610183414.1A
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CN105590583B (en
Inventor
吴霜毅
李明
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HONGLINIKE SCIENCE AND TECHNOLOGY Co Ltd BEIJING
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HONGLINIKE SCIENCE AND TECHNOLOGY Co Ltd BEIJING
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention provides a gray scale voltage generation circuit, a generation method, a driving circuit and a display device. The gray scale voltage generation circuit comprises a gamma correction unit, a resistor string, a selection unit, multiple current interpolation arithmetic units and multiple voltage driving units. Since not all 2N gray scale voltages corresponding to image data with a high bit width of N bits are generated by the resistor string, and the resistor string is only adopted for generating 2M gray scale voltages corresponding to the first M bits of the image data with the high bit width, after the first voltage and the second voltage are selected from the 2M gray scale voltages, the difference value between the first voltage and the second voltage is equally divided, the voltage corresponding to the last (N-M) bits of the image data with the high bit width is selected, and finally the voltage and the first voltage are added to obtain a gray scale voltage corresponding to the image data with the high bit width. In this way, there is no need to increase the bit width of the gray scale voltage generation circuit by increasing the number of resistor strings and lines, and therefore increase of the line arrangement complexity and the driving chip area of the gray scale voltage generation circuit will not be caused.

Description

Gray scale voltage generation circuit, production method, drive circuit and display unit
Technical field
The present invention relates to luminescence display technical field, more particularly, relate to a kind of gray scale voltage and produce electricityRoad, production method, drive circuit and display unit.
Background technology
Organic Light Emitting Diode (OrganicLightEmittingDiode is called for short OLED) Display Technique isA kind of technology of utilizing organic semiconducting materials to produce reversible color under current drives to realize demonstration. ByThere is the advantages such as ultralight, ultra-thin, high brightness and high-luminous-efficiency in OLED display screen, therefore, recognizedFor being the most rising Display Technique of new generation.
OLED display screen shows that the quality of image depends on the performance that it drives chip to a great extent, and is somebody's turn to doDrive in chip, the module that affects image displaying quality is grayscale voltage generation circuit and DAC (DigitaltoAnalogconverter, digital analog converter). Wherein, grayscale voltage generation circuit is by non-linear electricityResistance string produces the multiple GTG electricity between hot side supply voltage VDD and low potential side supply voltage VSSPress. For example, when the view data of input is N position, produce 2NIndividual gray scale voltage. DAC sends out from gray scale voltageIn multiple gray scale voltages that raw circuit produces, select a GTG electricity corresponding with the view data of inputtingPress, then export the gray scale voltage of selecting to OLED display screen by voltage buffer stage, with driving OLEDDisplay screen shows.
In order to improve resolution ratio and the image quality of OLED display screen, need to be to the bit wide of view dataExpand, for example, expand to 10 even 12 from 8, meanwhile, also need OLED display screenDrive the bit wide of the grayscale voltage generation circuit of chip internal to expand accordingly, so that the GTG producingThe bit wide of voltage and the bit wide of view data match. In prior art, conventionally send out by increasing gray scale voltageResistance string and cabling in raw circuit, produce circuit to grayscale voltage and carry out the expansion of bit wide. But,Because OLED display screen at least comprises the pixel of three kinds of colors of RGB, and the pixel of each colorAll need a gray scale voltage generation circuit that gray scale voltage is provided separately, therefore, the pixel of every kind of colorCorresponding gray scale voltage generation circuit all needs to increase resistance and cabling, so not only can increase answering of cablingAssorted spending, also can increase the area of OLED display screen drive chip.
In addition, generally, the input of OLED display screen (input voltage, input current) and output(brightness) is not linear proportional relationship, and due to human eye sensitivity to light under different brightnessDegree difference, so need to be to the driving chip of OLED display screen in order to obtain better vision display effectInput-output characteristic carry out gamma characteristic correction. In prior art, grayscale voltage generation circuit is gammaUnder the control of correcting controlling signal, realize the gamma school of this point by changing the resistance value of some fixing pointJust, and gray scale voltage after output calibration, still, because the gray scale voltage after proofreading and correct remains by non-Linear resistance string is realized, and therefore, can cause that gamma curve is level and smooth not, calibration accuracy is lower, impactOLED display screen shows the quality of image.
Summary of the invention
In view of this, the invention provides a kind of gray scale voltage generation circuit, production method, drive circuitAnd display unit, to solve in prior art the gray scale voltage causing owing to increasing new resistance and cablingThe complexity that produces the cabling of circuit increases and drives the problem of chip area increase and fix by changeThe resistance value of point is carried out the level and smooth not and calibration accuracy of gamma curve after correction that gamma correction causesLower problem.
For achieving the above object, the invention provides following technical scheme:
A kind of gray scale voltage generation circuit, comprises gammate, resistance string and selected cell, multipleInterpolating arithmetic element and multiple voltage drive unit;
Under the control of described gammate for the control signal in input, select and the low-bit width of inputtingThe high-bit width view data of N bit corresponding to view data, and by the front M of described high-bit width view dataPosition transfers to described resistance string and selected cell, and rear (N-M) position of described high-bit width view data is transferred toCorresponding described interpolating arithmetic element, wherein, M is greater than 1 natural number, and N is greater than M'sNatural number, described low-bit width view data is the view data of the pixel of any color in display unit;
Described resistance string and selected cell are for generation of corresponding with the front M position of described high-bit width view data2MIndividual gray scale voltage, and from described 2MIn individual gray scale voltage, select the front M with described high-bit width view dataThe first voltage that position is corresponding and there is the second voltage of preset difference value with described the first voltage, and transfer to rightThe interpolating arithmetic element of answering;
Described interpolating arithmetic element for be the first electric current by described the first voltage transitions, by described theTwo voltage transitions are the second electric current, and the electric current between described the first electric current and the second electric current is divided into 2N-MPart, from described 2N-MIn part electric current, select the electric current corresponding with (N-M) position after described high-bit width view data,And transfer to corresponding voltage drive unit;
Described voltage drive unit is for being voltage by the described current conversion of selecting, and by described voltage withDescribed the first voltage is added and obtains the gray scale voltage corresponding with described high-bit width view data.
Preferably, described gammate comprises input data distributor, three correction modules, multichannelSelector and output data distributor, described three correction modules are corresponding with the pixel of different colours respectively;
Described input data distributor is used under the control of described control signal described low-bit width picture numberReportedly transport to corresponding correction module;
Described correction module is for selecting and described low-bit width figure in the high-bit width view data of storage insideHigh-bit width view data corresponding to picture data, and described high-bit width image data transmission to described multichannel is selectedSelect device;
Described MUX is used under the control of described control signal by described output data distributorThe front M position of described high-bit width view data is transferred to described resistance string and selected cell, by a described high positionRear (N-M) position of wide view data transfers to corresponding interpolating arithmetic element.
Preferably, described correction module comprises correcting register and register control module;
Described correcting register is used for storing high-bit width view data;
Described register control module is for selecting from the high-bit width view data of described correcting register storageGo out the high-bit width view data corresponding with the low-bit width view data of input.
Preferably, described three correction modules comprise the first correction module, the second correction module and the 3rd schoolPositive module, described pixel comprises red pixel point, green pixel point and blue pixel point, described multipleInterpolating arithmetic element comprises the first interpolating arithmetic element, the second interpolating arithmetic element andThree interpolating arithmetic elements;
Described input data distributor is under the control of described control signal, low by red pixel pointBit wide image data transmission to the first correction module, by the low-bit width image data transmission of green pixel point extremelyThe second correction module, by low-bit width image data transmission to the three correction modules of blue pixel point;
Described the first correction module is for selecting and described redness in the high-bit width view data of storage insideThe high-bit width view data of red pixel point corresponding to the low-bit width view data of pixel, and transfer to instituteState MUX, so that described MUX looks like described redness by described output data distributorThe front M position of the high-bit width view data of vegetarian refreshments transfers to described resistance string and selected cell, rear (N-M) positionTransfer to described the first interpolating arithmetic element;
Described the second correction module is for selecting and described green in the high-bit width view data of storage insideThe high-bit width view data of green pixel point corresponding to the low-bit width view data of pixel, and transfer to instituteState MUX, so that described MUX looks like described green by described output data distributorThe front M position of the high-bit width view data of vegetarian refreshments transfers to described resistance string and selected cell, rear (N-M) positionTransfer to described the second interpolating arithmetic element;
Described the 3rd correction module is for selecting and described blueness in the high-bit width view data of storage insideThe high-bit width view data of blue pixel point corresponding to the low-bit width view data of pixel, and transfer to instituteState MUX, so that described MUX looks like described blueness by described output data distributorThe front M position of the high-bit width view data of vegetarian refreshments transfers to described resistance string and selected cell, rear (N-M) positionTransfer to described the 3rd interpolating arithmetic element.
Preferably, described interpolating arithmetic element comprises that the first voltage turns current unit, second voltage turnsCurrent unit and solution for the current code element;
Described the first voltage turns current unit for being the first electric current by described the first voltage transitions, and transmissionTo described solution for the current code element;
Described second voltage turns current unit for described second voltage is converted to the second electric current, and transmissionTo described solution for the current code element;
Described solution for the current code element is for being divided into the electric current between described the first electric current and the second electric current2N-MPart, and described high-bit width view data rear (N-M) position control under, from described 2N-MPart electric currentIn select and electric current corresponding to rear (N-M) position of described high-bit width view data.
Preferably, described interpolating arithmetic element also comprises the first current mirror unit and the second current mirrorPicture unit;
Described the first voltage turns current unit for being the first electric current by described the first voltage transitions, and transmissionTo described the first current mirror unit;
Described second voltage turns current unit for described second voltage is converted to the second electric current, and transmissionTo described the second current mirror unit;
Described the first current mirror unit is used for described the first electric current to carry out the amplification of the first ratio, and willThe first current delivery after amplification is to described solution for the current code element;
Described the second current mirror unit is used for described the second electric current to carry out the amplification of the second ratio, and willThe second current delivery after amplification is to described solution for the current code element, described the second ratio and described the first ratioCan be different, by controlling current mirror ratio and solution for the current code element, can produce different multiplesDifference;
Described solution for the current code element is used for the electric current between the first electric current after described amplification and the second electric currentBe divided into 2N-MPart, and described high-bit width view data rear (N-M) position control under, from described 2N-MIn part electric current, select electric current corresponding with rear (N-M) position of described high-bit width view data.
A kind of drive circuit, comprises the gray scale voltage generation circuit described in as above any one.
A kind of display unit, comprises drive circuit as above.
A kind of gray scale voltage production method, is applied to the gray scale voltage generation circuit described in as above any one,Comprise:
Gammate is selected and the low-bit width view data of inputting under the control of the control signal of inputCorresponding high-bit width view data;
Resistance string and selected cell are for generation of corresponding with the front M position of described high-bit width view data 2MIndividual gray scale voltage, and from described 2MIn individual gray scale voltage, select the front M position with described high-bit width view dataThe first corresponding voltage and there is the second voltage of preset difference value with described the first voltage;
Interpolating arithmetic element is the first electric current, described second voltage is turned described the first voltage transitionsBe changed to the second electric current, the electric current between described the first electric current and the second electric current is divided into 2N-MPart, from instituteState 2N-MIn part electric current, select electric current corresponding with rear (N-M) position of described high-bit width view data;
Voltage drive unit is voltage by the described current conversion of selecting, and by described voltage and described firstVoltage is added and obtains the gray scale voltage corresponding with described high-bit width view data.
Preferably, described the first voltage transitions is the first electric current, described second voltage is converted to secondElectric current, is divided into 2 by the electric current between described the first electric current and the second electric currentN-MThe process of part comprises:
Be the first electric current by described the first voltage transitions, and described the first electric current is carried out to putting of the first ratioGreatly;
Described second voltage is converted to the second electric current, and described the second electric current is carried out to putting of the second ratioGreatly, described the second ratio can be different from described the first ratio, by controlling current mirror ratio and electricityFlow decoding unit, can produce the difference of different multiples;
Electric current between the first electric current after described amplification and the second electric current is divided into 2N-MPart.
Compared with prior art, technical scheme provided by the present invention has the following advantages:
Gray scale voltage generation circuit provided by the present invention, production method, drive circuit and display unit,Owing to not adopting resistance string to produce corresponding with the view data of high-bit width 2 completelyNIndividual gray scale voltage,But adopt resistance string to produce corresponding with the front M position of high-bit width view data 2MIndividual gray scale voltage, from2MIn individual gray scale voltage, select after the first voltage and second voltage, the difference between the two carried out to decile,And select the voltage corresponding with rear (N-M) position of high-bit width view data, finally by this voltage and the first voltageAddition obtains the gray scale voltage corresponding with high-bit width view data, therefore, does not need by increasing resistance stringNumber and cabling increase the bit wide of gray scale voltage generation circuit, thereby the gray scale voltage that can not cause producesThe complexity of the cabling of circuit increases and drives chip area to increase;
And the pixel of the different colours in the present invention all passes through same resistance string and selected cell producesRaw gray scale voltage, instead of the pixel of each color produces by a resistance string and selected cell respectivelyRaw gray scale voltage, therefore, has further reduced to drive the area of chip;
Secondly, the gray scale voltage generation circuit in the present invention, in the time carrying out gamma correction, only needs by programmingHigh-bit width view data in change gammate can realize the object of gamma correction, and, byBe the gray scale voltage producing according to the view data of high-bit width in resistance string and selected cell, therefore, proofread and correctAfter smoothness and the precision of gamma curve higher.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to realityThe accompanying drawing of executing required use in example or description of the Prior Art is briefly described, apparently, belowAccompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, notPay under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
The structural representation of the display unit that Fig. 1 provides for the embodiment of the present invention;
The structural representation of a kind of gray scale voltage generation circuit that Fig. 2 provides for the embodiment of the present invention;
The structural representation of the gammate that Fig. 3 provides for the embodiment of the present invention;
The concrete structure schematic diagram of the gray scale voltage generation circuit that Fig. 4 provides for the embodiment of the present invention;
The structural representation of the interpolating arithmetic element that Fig. 5 provides for the embodiment of the present invention;
The flow chart of a kind of gray scale voltage production method that Fig. 6 provides for the embodiment of the present invention.
Detailed description of the invention
As described in background, in prior art, pass through to increase the resistance string in grayscale voltage generation circuitWith cabling, the bit wide of gray scale voltage generation circuit is expanded, still, so not only can be increased cablingComplexity, also can increase the area of OLED display screen drive chip. And, in prior art, pass throughThe resistance value that changes some fixing point in grayscale voltage generation circuit realizes the gamma correction of this point, like thisCan cause that gamma curve is level and smooth not, calibration accuracy is lower.
Based on this, the invention provides a kind of gray scale voltage generation circuit, to overcome, prior art existsThe problems referred to above, comprise gammate, resistance string and selected cell, multiple interpolating arithmetic elementWith multiple voltage drive units;
Under the control of described gammate for the control signal in input, select and the low-bit width of inputtingThe high-bit width view data of N bit corresponding to view data, and by the front M of described high-bit width view dataPosition transfers to described resistance string and selected cell, and rear (N-M) position of described high-bit width view data is transferred toCorresponding described interpolating arithmetic element, wherein, M is greater than 1 natural number, and N is greater than M'sNatural number, described low-bit width view data is the view data of the pixel of any color in display unit;
Described resistance string and selected cell are for generation of corresponding with the front M position of described high-bit width view data2MIndividual gray scale voltage, from described 2MIn individual gray scale voltage, select the front M with described high-bit width view dataThe first voltage that position is corresponding and there is the second voltage of preset difference value with described the first voltage, and transfer to rightThe interpolating arithmetic element of answering;
Described interpolating arithmetic element for be the first electric current by described the first voltage transitions, by described theTwo voltage transitions are the second electric current, and the electric current between described the first electric current and the second electric current is divided into 2N-MPart, from described 2N-MIn part electric current, select electricity corresponding with rear (N-M) position of described high-bit width view dataStream, and transfer to corresponding voltage drive unit;
Described voltage drive unit is for being voltage by the described current conversion of selecting, and by described voltage withDescribed the first voltage is added and obtains the gray scale voltage corresponding with described high-bit width view data.
The present invention also provides a kind of drive circuit, comprises that the gray scale voltage described in as above any one produces electricityRoad.
The present invention also provides a kind of display unit, comprises drive circuit as above.
The present invention also provides a kind of gray scale voltage production method, is applied to the GTG described in as above any oneVoltage generation circuit, comprising:
Gammate is selected and the low-bit width view data of inputting under the control of the control signal of inputCorresponding high-bit width view data;
Resistance string and selected cell produce from resistance string location according to the front M position of described high-bit width view dataMultiple gray scale voltages in select the first corresponding voltage and there is the of preset difference value with described the first voltageTwo voltages;
Interpolating arithmetic element is the first electric current, described second voltage is turned described the first voltage transitionsBe changed to the second electric current, the electric current between described the first electric current and the second electric current is divided into 2N-MPart, from instituteState 2N-MIn part electric current, select electric current corresponding with rear (N-M) position of described high-bit width view data;
Voltage drive unit is voltage by the described current conversion of selecting, and by described voltage and described firstVoltage is added and obtains the gray scale voltage corresponding with described high-bit width view data.
Gray scale voltage generation circuit provided by the invention, production method, drive circuit and display unit, byIn not adopting resistance string to produce corresponding with the view data of the high-bit width of N bit 2 completelyNIndividual GTGVoltage, but adopt resistance string to produce corresponding with the front M position of the view data of high-bit width 2MIndividual GTG electricityPress, from 2MIn individual gray scale voltage, select after the first voltage and second voltage, the difference between the two is carried outDecile, and selecting and voltage corresponding to rear (N-M) position of high-bit width view data, finally by this voltage and theOne voltage is added and obtains the gray scale voltage corresponding with high-bit width view data, therefore, does not need by increasing electricityThe number of resistance string and cabling increase the bit wide of gray scale voltage generation circuit, thus the GTG electricity that can not causePress the complexity of the cabling that produces circuit increase and drive chip area to increase;
And the pixel of the different colours in the present invention all passes through same resistance string and selected cell producesRaw gray scale voltage, instead of the pixel of each color produces by a resistance string and selected cell respectivelyRaw gray scale voltage, therefore, has further reduced to drive the area of chip;
Secondly, the gray scale voltage generation circuit in the present invention, in the time carrying out gamma correction, only needs by programmingHigh-bit width view data in change gammate can realize the object of gamma correction, and, byBe the gray scale voltage producing according to the view data of high-bit width in resistance string and selected cell, therefore, proofread and correctAfter smoothness and the precision of gamma curve higher.
More than core concept of the present invention, for making above-mentioned purpose of the present invention, feature and advantage can be moreAdd and become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Set forth in the following description a lot of details so that fully understand the present invention, but thisBrightly can also adopt other to be different from alternate manner described here to implement, those skilled in the art canWithout prejudice to intension of the present invention in the situation that, do similar popularization, therefore the present invention is not subject to following public concreteThe restriction of embodiment.
Secondly, the present invention is described in detail in conjunction with schematic diagram, in the time that the embodiment of the present invention is described in detail in detail, for justIn explanation, represent that the profile of device architecture can be disobeyed local amplification of general ratio work, and described signalFigure is example just, and it should not limit the scope of protection of the invention at this. In addition in actual fabrication, should wrap,Containing the three-dimensional space of length, width and the degree of depth.
Embodiments of the invention provide a kind of gray scale voltage generation circuit, and this gray scale voltage generation circuit shouldFor drive circuit or the driving chip of display unit, be used to display unit to provide and show required ashRank voltage.
Optionally, this display unit comprise array base palte, the color membrane substrates that is oppositely arranged with array base palte andLiquid crystal layer between array base palte and color membrane substrates. As shown in Figure 1, array base palte comprises many dataLine 10, multi-strip scanning line 11, the pixel cell being arranged in array being surrounded by data wire 10 and scan line 11The data drive circuit 13 that 12 is pixel, be connected with all data wires 10, be connected with all scan lines 11Scan drive circuit 14 and to data drive circuit 13 and scan drive circuit 14 provide control signal andThe display controller 15 of view data.
Each pixel cell 12 includes pixel electrode 120 and thin film transistor (TFT) 121, this thin film transistor (TFT) 121Grid be connected with scan line 11, source electrode is connected with data wire 10, drain electrode is connected with pixel electrode 120, sweepRetouch drive circuit 14 thin to making after the grid input scan signal of thin film transistor (TFT) 121 by scan line 11Film transistor 121 conductings, and then make the data-signal that data drive circuit 13 is inputted by data wire 10 beIn the source electrode and drain electrode input pixel electrode 120 of gray scale voltage by thin film transistor (TFT) 121. With pixel cellThe effect of the voltage difference of the liquid crystal in the liquid crystal layer of 12 correspondences between pixel electrode 120 and public electrodeLower upset printing opacity, wherein, public electrode covers pixel cell 12, provides with the pixel cell 12 to allCommon electric voltage.
Color membrane substrates comprises the color blocking unit of multiple array arrangements, and each color blocking unit at least comprises a rednessColor blocking, a green color blocking and a blue color blocking. The corresponding light that filters pixel cell 12 transmissions of each color blocking,So that the light seeing through takes on a red color, green or blue, namely making this pixel cell 12 is that pixel is redColour vegetarian refreshments, green pixel point or blue pixel point. For example, red pixel point takes on a red color, green pixelPoint is green, blue pixel point is blue. According to three primary color theory, redgreenblue light can be mixed into instituteColoured light, therefore, can be by the combination of red pixel point, green pixel point and blue pixel pointRealize the demonstration of image.
The gray scale voltage generation circuit that the present embodiment provides is arranged in data drive circuit 13, for showingUnder the control signal that controller 15 is inputted and the effect of view data, produce gray scale voltage. As shown in Figure 2, shouldGray scale voltage generation circuit comprises that gammate 20, resistance string and selected cell 21, multiple electric current insertValue arithmetic element 22 and multiple voltage drive unit 23, wherein, interpolating arithmetic element 22 correspondencesA pixel setting, an also corresponding pixel setting of voltage drive unit 23.
Wherein, gammate 20 under the control of control signal in input, select with input lowThe high-bit width view data of N bit (Bit) corresponding to bit wide view data, as by the picture number of 10 bitsAccording to the view data that is converted to 12 bits, and by extremely electricity of the front M bit image transfer of data of high-bit width view dataResistance string and selected cell 21, by extremely corresponding electricity of rear (N-M) bit image transfer of data of high-bit width view dataStream interpolation arithmetic unit 22, wherein, low-bit width view data is the pixel of any color in display unitThe view data of point, M, N are the natural number that is greater than 1, and N is greater than M;
Resistance string and selected cell 21 are for generation of corresponding with the front M bit image data of high-bit width view data2MIndividual gray scale voltage, and from 2MIn individual gray scale voltage, select the front M bit image with high-bit width view dataThe first voltage V1 that data are corresponding and there is the second voltage V2 of preset difference value with the first voltage V1;
Interpolating arithmetic element 22 is for being converted to the first electric current I 1 by the first voltage V1, by second voltageV2 is converted to the second electric current I 2, and the electric current between the first electric current I 1 and the second electric current I 2 is divided into 2N-MPart,From 2N-MIn part electric current, select a electric current corresponding with rear (N-M) bit image data of high-bit width view dataI0, and electric current I 0 is transferred to corresponding voltage drive unit 23;
Voltage drive unit 23 is for the electric current I of selecting 0 is converted to voltage V0, and by voltage V0 and firstVoltage V1 is added and obtains the gray scale voltage V corresponding with high-bit width view data, and this gray scale voltage V is transmittedExtremely corresponding pixel is pixel cell 12.
As shown in Figure 3, gammate 20 comprises input data distributor 201, three correction modules202, MUX 203 and output data distributor 204, described three correction modules 202 respectively withThe pixel correspondence of different colours. Wherein, input data distributor 201 is for defeated at display controller 15Under the control of the control signal entering, the low-bit width image data transmission that display controller 15 is inputted is to correspondingCorrection module 202; Correction module 202 is selected with low for the high-bit width view data in storage insideThe high-bit width view data that bit wide view data is corresponding, and by the high-bit width image data transmission of selecting at the mostRoad selector 203; MUX 203 is for the control of the control signal inputted at display controller 15Under, by output data distributor 204, the front M bit data of high-bit width view data is transferred to resistance stringAnd selected cell 21, rear (N-M) bit data of high-bit width view data is transferred to corresponding interpolating fortuneCalculate unit 22.
Wherein, what high-bit width view data and low-bit width view data were used is same set of reference voltage, butBe, because high-bit width view data is more than the grade of low-bit width view data, therefore, low-bit width dataWith high-bit width data be not relation one to one, low-bit width data can corresponding multiple high-bit widthsView data, the interval of high-bit width data corresponding to each low-bit width data can cover from being less than low levelWide data are to the multiple high-bit width data that are greater than low-bit width data. Can realize like this low-bit width dataUp-down adjustment, thus realize the effect of nonlinear gamma corrected, simultaneously between the adjacent numerical value of high-bit width dataVoltage jump amplitude less, the curve of generation is more level and smooth, display effect is better.
Further it should be noted that, the correction module 202 in the present embodiment comprises correcting register and postsStorage control module, wherein, correcting register is used for storing high-bit width view data, and it stores with lowAll high-bit width view data that bit wide view data is corresponding; Register control module is for depositing from proofreading and correctIn the high-bit width view data of device storage, select the high-bit width image corresponding with the low-bit width view data of inputtingData.
Comprise i.e. the first correction module 202a, the second school of three correction modules with gammate 20 belowPositive module 202b, the 3rd correction module 202c, multiple interpolating arithmetic elements comprise the first interpolatingArithmetic element 22a, the second interpolating arithmetic element 22b and the 3rd interpolating arithmetic element 22c, asVegetarian refreshments comprises that red pixel point R, green pixel point G and blue pixel point B are that example describes.
As shown in Figure 4, input data distributor 201 is under the control of control signal, by display controllerLow-bit width image data transmission to the first correction module 202a of the red pixel point of 15 inputs, will show controlLow-bit width image data transmission to the second correction module 202b of the green pixel point that device 15 processed is inputted, will showShow low-bit width image data transmission to the three correction module 202c of the blue pixel point that controller 15 inputs.
The first correction module 202a selects and the redness picture of inputting in the high-bit width view data of storage insideThe high-bit width view data of red pixel point corresponding to the low-bit width view data of vegetarian refreshments, and by this redness pictureThe high-bit width image data transmission of vegetarian refreshments is to MUX 203, so that MUX 203 is by outputData distributor 204 is by extremely electricity of the front M bit image transfer of data of the high-bit width view data of red pixel pointResistance string and selected cell 21, pass the rear N-M bit image data of the high-bit width view data of red pixel pointTransport to the first interpolating arithmetic element 22a;
Resistance string and selected cell 21 are according to the front M bit image number of the high-bit width view data of red pixel pointAccording to producing 2MIndividual gray scale voltage, and from this 2MIn individual gray scale voltage, select the high-bit width with red pixel pointThe first voltage V corresponding to front M bit image data of view dataR1With with the first voltage VR1Have defaultDifference is as the second voltage V of 1LSB (LeastSignificantBit, least significant bit)R2, and by firstVoltage VR1With second voltage VR2Transfer to the first interpolating arithmetic element 22a;
The first interpolating arithmetic element 22a is by the first voltage V receivingR1Be converted to the first electric current IR1、By the second voltage V receivingR2Be converted to the second electric current IR2, by the first electric current IR1With the second electric current IR2Between electric current be divided into 2N-MPart, and from 2N-MIn part electric current, select the high-bit width figure with red pixel pointThe a electric current I corresponding to rear (N-M) bit image data of picture dataR0, and by this electric current IR0Transfer to firstVoltage drive unit 23a;
The first voltage drive unit 23a is by the electric current I of selecting afterwardsR0Be converted to voltage VR0, and by voltageVR0With the first voltage VR1Addition obtains the gray scale voltage corresponding with the high-bit width view data of red pixel pointVR, and by this gray scale voltage VRTransfer to corresponding red pixel point R.
The second correction module 202b selects and the green picture of inputting in the high-bit width view data of storage insideThe high-bit width view data of green pixel point corresponding to the low-bit width view data of vegetarian refreshments, and by this green pictureThe high-bit width image data transmission of vegetarian refreshments is to MUX 203, so that MUX 203 is by outputData distributor 204 is by extremely electricity of the front M bit image transfer of data of the high-bit width view data of green pixel pointResistance string and selected cell 21, pass the rear N-M bit image data of the high-bit width view data of green pixel pointTransport to the second interpolating arithmetic element 22b;
Resistance string and selected cell 21 are according to the front M bit image number of the high-bit width view data of green pixel pointAccording to producing 2MIndividual gray scale voltage, from this 2MIn individual gray scale voltage, select the high-bit width figure with green pixel pointThe first voltage V corresponding to front M bit image data of picture dataG1With with the first voltage VG1It is default poor to haveThe second voltage V of value (1LSB)G2, and by the first voltage VG1With second voltage VG2Transfer to secondInterpolating arithmetic element 22b;
The second interpolating arithmetic element 22b is by the first voltage V receivingG1Be converted to the first electric current IG1、By the second voltage V receivingG2Be converted to the second electric current IG2, by the first electric current IG1With the second electric current IG2Between electric current be divided into 2N-MPart, and from 2N-MIn part electric current, select the high-bit width figure with green pixel pointThe a electric current I corresponding to rear (N-M) bit image data of picture dataG0, and by this electric current IG0Transfer to secondVoltage drive unit 23b;
Second voltage driver element 23b is by the electric current I of selecting afterwardsG0Be converted to voltage VG0, and by voltageVG0With the first voltage VG1Addition obtains the gray scale voltage corresponding with the high-bit width view data of green pixel pointVG, and by this gray scale voltage VGTransfer to corresponding green pixel point G.
The 3rd correction module 202c selects with blue pixel point in the high-bit width view data of storage insideThe high-bit width view data of blue pixel point corresponding to low-bit width view data, and by this blue pixel pointHigh-bit width image data transmission is to MUX 203, so that MUX 203 divides by output dataThe front M bit image transfer of data that blue pixel is put high-bit width view data by orchestration 204 is to resistance string and choosingSelect unit 21, by the rear N-M bit image transfer of data to the three of the high-bit width view data of blue pixel pointInterpolating arithmetic element 22c;
Resistance string and selected cell 21 are according to the front M bit image number of the high-bit width view data of blue pixel pointAccording to producing 2MIndividual gray scale voltage, from this 2MIn individual gray scale voltage, select the high-bit width figure with blue pixel pointThe first voltage V corresponding to front M bit image data of picture dataB1With with the first voltage VB1It is default poor to haveThe second voltage V of value (1LSB)B2, and by the first voltage VB1With second voltage VB2Transfer to the 3rd electricityStream interpolation arithmetic unit 22c;
The 3rd interpolating arithmetic element 22c is by the first voltage V receivingB1Be converted to the first electric current IB1、By the second voltage V receivingB2Be converted to the second electric current IB2, by the first electric current IB1With the second electric current IB2Between electric current be divided into 2N-MPart, and from 2N-MIn part electric current, select the high-bit width figure with blue pixel pointThe electric current I corresponding to rear (N-M) bit image data of picture dataG0, and by this electric current IG0Transfer to tertiary voltageDriver element 23c;
Tertiary voltage driver element 23c is by the electric current I of selecting afterwardsB0Be converted to voltage VB0, and by voltageVB0With the first voltage VB1Addition obtains the gray scale voltage corresponding with the high-bit width view data of blue pixel pointVB, and by this gray scale voltage VBTransfer to corresponding blue pixel point B.
Hence one can see that, and the gray scale voltage generation circuit that the present embodiment provides can be by adjusting the first correcting unitHigh-bit width view data in 202a regulates the gamma curve of red pixel point, can proofread and correct by adjusting secondHigh-bit width view data in unit 202b regulates the gamma curve of green pixel point, can be by adjusting the 3rdHigh-bit width view data in correcting unit 202c regulates the gamma curve of blue pixel point, thereby makes to showThe gamma curve of showing device is proofreaied and correct more accurate, and the display effect after correction is better.
Further it should be noted that, the arbitrary interpolating arithmetic element 22 in the present embodiment comprises firstVoltage turns current unit 220, second voltage turns current unit 221 and solution for the current code element 222 is electric currentDAC；
Wherein, the first voltage turns current unit 220 for the first voltage V1 is converted to the first electric current I 1,And transfer to solution for the current code element 222; Second voltage turns current unit 221 for second voltage V2 is turnedBe changed to the second electric current I 2, and transfer to solution for the current code element 222; Solution for the current code element 222 is for by firstElectric current between electric current I 1 and the second electric current I 2 is divided into 2N-MPart, and after high-bit width view data(N-M) under the control of bit image data, from 2N-MIn part electric current, select rear (N-M) with high-bit width view dataThe electric current I 0 that bit image data are corresponding.
In another embodiment of the present invention, interpolating arithmetic element also comprises the first current mirror unit223 and the second current mirror unit 224.
As shown in Figure 5, the first voltage turns current unit 220 for the first voltage V1 is converted to the first electricityStream I1, and transfer to the first current mirror unit 223; Second voltage turns current unit 221 for by secondVoltage V2 is converted to the second electric current I 2, and transfers to the second current mirror unit 224; The first current mirrorUnit 223 is for the first electric current I 1 is carried out to the amplification of the first ratio, and by the first electric current I 1 after amplifyingTransfer to solution for the current code element 222; The second current mirror unit 224 is for carrying out to the second electric current I 2The amplification of two ratios, and the second electric current I 2 after amplifying is transferred to solution for the current code element 222, the second ratiosExample is identical from the first ratio but also can be set to differently, finally can obtain by control current mirror ratioTo any multiple of the first voltage V1 and second voltage V2 difference;
Solution for the current code element 222 for by amplify after the first electric current I 1 and the electric current between the second electric current I 2Be divided into 2N-MPart, and under the control of rear (N-M) of high-bit width view data bit image data, from 2N-MIn part electric current, select the electric current I 0 corresponding with rear (N-M) bit image data of high-bit width view data.
In the present embodiment, adopt the voltage transitions current unit of high linearity, can realize voltage and electric current itBetween highly linear conversion, what between the difference electric current that profit produces in this way and voltage difference, exist isA relation for highly linear, thus avoid introducing nonideal non-linear factor, make gamma curveThe linearity better.
The gray scale voltage generation circuit that the present embodiment provides, due to do not adopt completely resistance string produce withThe view data of high-bit width corresponding 2NIndividual gray scale voltage, but employing resistance string produces and the figure of high-bit widthPicture data front M bit image data corresponding 2MIndividual gray scale voltage, from 2MIn individual gray scale voltage, selectAfter one voltage and second voltage, the difference between the two is carried out to decile, and select and high-bit width picture numberAccording to voltage corresponding to rear (N-M) bit image data, finally this voltage and the first voltage are added and are obtained and heightThe gray scale voltage that bit wide view data is corresponding, therefore, does not need number and cabling by increasing resistance stringIncrease the bit wide of gray scale voltage generation circuit, thereby the cabling of the gray scale voltage generation circuit that can not causeComplexity increases and drives chip area to increase;
And the pixel of the different colours in the present embodiment all passes through same resistance string and selected cellProduce gray scale voltage, instead of the pixel of each color is respectively by a resistance string and selected cellProduce gray scale voltage, therefore, further reduced to drive the area of chip;
Secondly, the gray scale voltage generation circuit in the present embodiment, in the time carrying out gamma correction, only needs by compilingHigh-bit width view data in journey change gammate can realize the object of gamma correction, and,Because resistance string and selected cell are the gray scale voltages producing according to the view data of high-bit width, therefore, schoolSmoothness and the precision of the gamma curve are just higher.
Embodiments of the invention also provide a kind of drive circuit, and this drive circuit comprises above-mentioned arbitrary enforcementThe gray scale voltage generation circuit that example provides.
Embodiments of the invention also provide a kind of display unit, and this display unit comprises that above-described embodiment carriesThe drive circuit of confession.
Embodiments of the invention also provide a kind of gray scale voltage production method, are applied to above-described embodiment and carryThe gray scale voltage generation circuit of confession, as shown in Figure 6, this gray scale voltage production method comprises:
S601: gammate is selected and the low-bit width figure inputting under the control of the control signal of inputHigh-bit width view data corresponding to picture data;
S602: resistance string and selected cell produce corresponding with the front M position of described high-bit width view data 2MIndividual gray scale voltage, and from described 2MIn individual gray scale voltage, select the front M position with described high-bit width view dataThe first corresponding voltage and there is the second voltage of preset difference value with described the first voltage;
S603: interpolating arithmetic element by described the first voltage transitions be the first electric current, by described secondVoltage transitions is the second electric current, and the electric current between described the first electric current and the second electric current is divided into 2N-MPart,From described 2N-MIn part electric current, select corresponding with rear (N-M) bit image data of described high-bit width view dataElectric current;
S604: voltage drive unit is voltage by the described current conversion of selecting, and by described voltage and instituteState the first voltage addition and obtain the gray scale voltage corresponding with described high-bit width view data.
Comprise the first correction module, the second correction module, the 3rd correction module with gammate below,Multiple interpolating arithmetic elements comprise the first interpolating arithmetic element, the second interpolating arithmetic elementWith the 3rd interpolating arithmetic element, pixel comprises red pixel point R, green pixel point G and bluenessPixel B is example, and the production process of gray scale voltage is described.
Input data distributor in gammate is under the control of control signal, by display controllerLow-bit width image data transmission to the first correction module of the red pixel point of input, display controller is defeatedLow-bit width image data transmission to the second correction module of the green pixel point entering, inputs display controllerLow-bit width image data transmission to the three correction modules of blue pixel point.
The first correction module is selected and the red pixel point of inputting in the high-bit width view data of storage insideThe high-bit width view data of red pixel point corresponding to low-bit width view data, and by this red pixel pointHigh-bit width image data transmission to MUX so that MUX by output data distributorThe front M bit image transfer of data of the high-bit width view data of red pixel point is single to resistance string and selectionUnit, inserts rear N-M bit image transfer of data to the first electric current of the high-bit width view data of red pixel pointValue arithmetic element;
Resistance string and selected cell are according to the front M bit image data of the high-bit width view data of red pixel pointProduce 2MIndividual gray scale voltage, and from this 2MIn individual gray scale voltage, select the high-bit width figure with red pixel pointThe first voltage V corresponding to front M bit image data of picture dataR1With with the first voltage VR1It is default poor to haveValue is as the second voltage V of 1LSBR2, and by the first voltage VR1With second voltage VR2Transfer to the first electricityStream interpolation arithmetic unit;
The first interpolating arithmetic element is by the first voltage V receivingR1Be converted to the first electric current IR1, willThe second voltage V receivingR2Be converted to the second electric current IR2, by the first electric current IR1With the second electric current IR2ItBetween electric current be divided into 2N-MPart, and from 2N-MIn part electric current, select the high-bit width image with red pixel pointThe a electric current I corresponding to rear (N-M) bit image data of dataR0, and by this electric current IR0Transfer to the first electricityPress driver element;
The first voltage drive unit is by the electric current I of selecting afterwardsR0Be converted to voltage VR0, and by voltage VR0With the first voltage VR1Addition obtains the gray scale voltage corresponding with the high-bit width view data of red pixel pointVR, and by this gray scale voltage VRTransfer to corresponding red pixel point R.
The second correction module is selected and the green pixel point of inputting in the high-bit width view data of storage insideThe high-bit width view data of green pixel point corresponding to low-bit width view data, and by this green pixel pointHigh-bit width image data transmission to MUX so that MUX by output data distributorThe front M bit image transfer of data of the high-bit width view data of green pixel point is single to resistance string and selectionUnit, inserts rear N-M bit image transfer of data to the second electric current of the high-bit width view data of green pixel pointValue arithmetic element;
Resistance string and selected cell are according to the front M bit image data of the high-bit width view data of green pixel pointProduce 2MIndividual gray scale voltage, from this 2MIn individual gray scale voltage, select the high-bit width image with green pixel pointThe first voltage V corresponding to front M bit image data of dataG1With with the first voltage VG1There is preset difference value(1LSB) second voltage VG2, and by the first voltage VG1With second voltage VG2Transfer to the second electricityStream interpolation arithmetic unit;
The second interpolating arithmetic element is by the first voltage V receivingG1Be converted to the first electric current IG1, willThe second voltage V receivingG2Be converted to the second electric current IG2, by the first electric current IG1With the second electric current IG2ItBetween electric current be divided into 2N-MPart, and from 2N-MIn part electric current, select the high-bit width image with green pixel pointThe a electric current I corresponding to rear (N-M) bit image data of dataG0, and by this electric current IG0Transfer to the second electricityPress driver element;
Second voltage driver element is by the electric current I of selecting afterwardsG0Be converted to voltage VG0, and by voltage VG0With the first voltage VG1Addition obtains the gray scale voltage corresponding with the high-bit width view data of green pixel pointVG, and by this gray scale voltage VGTransfer to corresponding green pixel point G.
The 3rd correction module is selected the low level with blue pixel point in the high-bit width view data of storage insideThe high-bit width view data of blue pixel point corresponding to wide view data, and by a high position for this blue pixel pointWide image data transmission is to MUX, so that MUX is by exporting data distributor by bluenessThe front M bit image transfer of data of pixel high-bit width view data is to resistance string and selected cell, by bluenessRear N-M bit image transfer of data to the three interpolating computing lists of the high-bit width view data of pixelUnit;
Resistance string and selected cell are according to the front M bit image data of the high-bit width view data of blue pixel pointProduce 2MIndividual gray scale voltage, from this 2MIn individual gray scale voltage, select the high-bit width image with blue pixel pointThe first voltage V corresponding to front M bit image data of dataB1With with the first voltage VB1There is preset difference value(1LSB) second voltage VB2, and by the first voltage VB1With second voltage VB2Transfer to the 3rd electric currentInterpolation arithmetic unit;
The 3rd interpolating arithmetic element is by the first voltage V receivingB1Be converted to the first electric current IB1, willThe second voltage V receivingB2Be converted to the second electric current IB2, by the first electric current IB1With the second electric current IB2ItBetween electric current be divided into 2N-MPart, and from 2N-MIn part electric current, select the high-bit width image with blue pixel pointThe electric current I corresponding to rear (N-M) bit image data of dataG0, and by this electric current IG0Transferring to tertiary voltage drivesMoving cell;
Tertiary voltage driver element is by the electric current I of selecting afterwardsB0Be converted to voltage VB0, and by voltage VB0With the first voltage VB1Addition obtains the gray scale voltage corresponding with the high-bit width view data of blue pixel pointVB, and by this gray scale voltage VBTransfer to corresponding blue pixel point B.
Wherein, when interpolating arithmetic element comprises that the first voltage turns current unit, second voltage turns electric currentWhen unit, the first current mirror unit, the second current mirror unit and solution for the current code element, by describedOne voltage transitions is the first electric current, described second voltage is converted to the second electric current, by described the first electric currentAnd second electric current between electric current be divided into 2N-MThe process of part comprises:
Be the first electric current by described the first voltage transitions, and described the first electric current is carried out to putting of the first ratioGreatly;
Described second voltage is converted to the second electric current, and described the second electric current is carried out to putting of the second ratioGreatly, described the second ratio can be different from described the first ratio, by controlling current mirror ratio and electricityFlow decoding unit, can produce the difference of different multiples;
Electric current between the first electric current after described amplification and the second electric current is divided into 2N-MPart.
The gray scale voltage production method that the present embodiment provides, due to do not adopt completely resistance string produce withThe view data of high-bit width corresponding 2NIndividual gray scale voltage, but employing resistance string produces and the figure of high-bit width2 of the front M position correspondence of picture dataMIndividual gray scale voltage, and from 2MIn individual gray scale voltage, select the first voltageAfter second voltage, the difference between the two is carried out to decile, and select with high-bit width view data after(N-M) voltage corresponding to position, finally obtains this voltage and the addition of the first voltage and high-bit width view data pairThe gray scale voltage of answering, therefore, does not need number and cabling by increasing resistance string to increase gray scale voltage productThe bit wide of raw circuit, thus the complexity of the cabling of the gray scale voltage generation circuit that can not cause increases and drivesMoving chip area increases;
And the pixel of the different colours in the present embodiment all passes through same resistance string and selected cellProduce gray scale voltage, instead of the pixel of each color is respectively by a resistance string and selected cellProduce gray scale voltage, therefore, further reduced to drive the area of chip;
Secondly, the gray scale voltage generation circuit in the present embodiment, in the time carrying out gamma correction, only needs by compilingHigh-bit width view data in journey change gammate can realize the object of gamma correction, and,Because resistance string and selected cell are the gray scale voltages producing according to the view data of high-bit width, therefore, schoolSmoothness and the precision of the gamma curve are just higher.
In this description, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stressesBe and the difference of other embodiment, between each embodiment identical similar part mutually referring to.For the disclosed device of embodiment, because it corresponds to the method disclosed in Example, so describeFairly simple, relevant part illustrates referring to method part.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field can be realized or useThe present invention. To be aobvious and easy for those skilled in the art to the multiple amendment of these embodimentSee, General Principle as defined herein can be in the situation that not departing from the spirit or scope of the present invention,Realize in other embodiments. Therefore, the present invention will can not be restricted to these embodiment shown in this article,But to meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (10)

1. a gray scale voltage generation circuit, is characterized in that, comprise gammate, resistance string andSelected cell, multiple interpolating arithmetic element and multiple voltage drive unit;
Under the control of described gammate for the control signal in input, select and the low-bit width of inputtingThe high-bit width view data of N bit corresponding to view data, and by the front M of described high-bit width view dataPosition transfers to described resistance string and selected cell, and rear (N-M) position of described high-bit width view data is transferred toCorresponding described interpolating arithmetic element, wherein, M is greater than 1 natural number, and N is greater than M'sNatural number, described low-bit width view data is the view data of the pixel of any color in display unit;
Described resistance string and selected cell are for generation of corresponding with the front M position of described high-bit width view data2MIndividual gray scale voltage, and from described 2MIn individual gray scale voltage, select the front M with described high-bit width view dataThe first voltage that position is corresponding and there is the second voltage of preset difference value with described the first voltage, and transfer to rightThe interpolating arithmetic element of answering;
Described interpolating arithmetic element for be the first electric current by described the first voltage transitions, by described theTwo voltage transitions are the second electric current, and the electric current between described the first electric current and the second electric current is divided into 2N-MPart, from described 2N-MIn part electric current, select the electric current corresponding with (N-M) position after described high-bit width view data,And transfer to corresponding voltage drive unit;
Described voltage drive unit is for being voltage by the described current conversion of selecting, and by described voltage withDescribed the first voltage is added and obtains the gray scale voltage corresponding with described high-bit width view data.
2. gray scale voltage generation circuit according to claim 1, is characterized in that, described gamma schoolPositive unit comprises input data distributor, three correction modules, MUX and output data distributors,Described three correction modules are corresponding with the pixel of different colours respectively;
Described input data distributor is used under the control of described control signal described low-bit width picture numberReportedly transport to corresponding correction module;
Described correction module is for selecting and described low-bit width figure in the high-bit width view data of storage insideHigh-bit width view data corresponding to picture data, and described high-bit width image data transmission to described multichannel is selectedSelect device;
Described MUX is used under the control of described control signal by described output data distributorThe front M position of described high-bit width view data is transferred to described resistance string and selected cell, by a described high positionRear (N-M) position of wide view data transfers to corresponding interpolating arithmetic element.
3. gray scale voltage generation circuit according to claim 2, is characterized in that, described straightening diePiece comprises correcting register and register control module;
Described correcting register is used for storing high-bit width view data;
Described register control module is for selecting from the high-bit width view data of described correcting register storageGo out the high-bit width view data corresponding with the low-bit width view data of input.
4. gray scale voltage generation circuit according to claim 3, is characterized in that, described three schoolsPositive module comprises the first correction module, the second correction module and the 3rd correction module, and described pixel comprisesRed pixel point, green pixel point and blue pixel point, described multiple interpolating arithmetic elements compriseOne interpolating arithmetic element, the second interpolating arithmetic element and the 3rd interpolating arithmetic element;
Described input data distributor is under the control of described control signal, low by red pixel pointBit wide image data transmission to the first correction module, by the low-bit width image data transmission of green pixel point extremelyThe second correction module, by low-bit width image data transmission to the three correction modules of blue pixel point;
Described the first correction module is for selecting and described redness in the high-bit width view data of storage insideThe high-bit width view data of red pixel point corresponding to the low-bit width view data of pixel, and transfer to instituteState MUX, so that described MUX looks like described redness by described output data distributorThe front M position of the high-bit width view data of vegetarian refreshments transfers to described resistance string and selected cell, rear (N-M) positionTransfer to described the first interpolating arithmetic element;
Described the second correction module is for selecting and described green in the high-bit width view data of storage insideThe high-bit width view data of green pixel point corresponding to the low-bit width view data of pixel, and transfer to instituteState MUX, so that described MUX looks like described green by described output data distributorThe front M position of the high-bit width view data of vegetarian refreshments transfers to described resistance string and selected cell, rear (N-M) positionTransfer to described the second interpolating arithmetic element;
Described the 3rd correction module is for selecting and described blueness in the high-bit width view data of storage insideThe high-bit width view data of blue pixel point corresponding to the low-bit width view data of pixel, and transfer to instituteState MUX, so that described MUX looks like described blueness by described output data distributorThe front M position of the high-bit width view data of vegetarian refreshments transfers to described resistance string and selected cell, rear (N-M) positionTransfer to described the 3rd interpolating arithmetic element.
5. gray scale voltage generation circuit according to claim 1, is characterized in that, described electric current is insertedValue arithmetic element comprises that the first voltage turns current unit, second voltage turns current unit and solution for the current code element;
Described the first voltage turns current unit for being the first electric current by described the first voltage transitions, and transmissionTo described solution for the current code element;
Described second voltage turns current unit for described second voltage is converted to the second electric current, and transmissionTo described solution for the current code element;
Described solution for the current code element is for being divided into the electric current between described the first electric current and the second electric current2N-MPart, and described high-bit width view data rear (N-M) position control under, from described 2N-MPart electric currentIn select and electric current corresponding to rear (N-M) position of described high-bit width view data.
6. gray scale voltage generation circuit according to claim 5, is characterized in that, described electric current is insertedValue arithmetic element also comprises the first current mirror unit and the second current mirror unit;
Described the first voltage turns current unit for being the first electric current by described the first voltage transitions, and transmissionTo described the first current mirror unit;
Described second voltage turns current unit for described second voltage is converted to the second electric current, and transmissionTo described the second current mirror unit;
Described the first current mirror unit is used for described the first electric current to carry out the amplification of the first ratio, and willThe first current delivery after amplification is to described solution for the current code element;
Described the second current mirror unit is used for described the second electric current to carry out the amplification of the second ratio, and willThe second current delivery after amplification is to described solution for the current code element, described the second ratio and described the first ratioCan be different, by controlling current mirror ratio and solution for the current code element, can produce different multiplesDifference;
Described solution for the current code element is used for the electric current between the first electric current after described amplification and the second electric currentBe divided into 2N-MPart, and described high-bit width view data rear (N-M) position control under, from described 2N-MIn part electric current, select electric current corresponding with rear (N-M) position of described high-bit width view data.
7. a drive circuit, is characterized in that, comprises the GTG electricity described in claim 1～6 any onePress and produce circuit.
8. a display unit, is characterized in that, comprises drive circuit claimed in claim 7.
9. a gray scale voltage production method, is characterized in that, is applied to claim 1～6 any one instituteThe gray scale voltage generation circuit of stating, comprising:
Gammate is selected and the low-bit width view data of inputting under the control of the control signal of inputCorresponding high-bit width view data;
Resistance string and selected cell are for generation of corresponding with the front M position of described high-bit width view data 2MIndividual gray scale voltage, and from described 2MIn individual gray scale voltage, select the front M position with described high-bit width view dataThe first corresponding voltage and there is the second voltage of preset difference value with described the first voltage;
Interpolating arithmetic element is the first electric current, described second voltage is turned described the first voltage transitionsBe changed to the second electric current, the electric current between described the first electric current and the second electric current is divided into 2N-MPart, from instituteState 2N-MIn part electric current, select electric current corresponding with rear (N-M) position of described high-bit width view data;
Voltage drive unit is voltage by the described current conversion of selecting, and by described voltage and described firstVoltage is added and obtains the gray scale voltage corresponding with described high-bit width view data.
10. gray scale voltage production method according to claim 9, is characterized in that, by describedOne voltage transitions is the first electric current, described second voltage is converted to the second electric current, by described the first electric currentAnd second electric current between electric current be divided into 2N-MThe process of part comprises:
Be the first electric current by described the first voltage transitions, and described the first electric current is carried out to putting of the first ratioGreatly;
Described second voltage is converted to the second electric current, and described the second electric current is carried out to putting of the second ratioGreatly, described the second ratio can be different from described the first ratio, by controlling current mirror ratio and electricityFlow decoding unit, can produce the difference of different multiples;
Electric current between the first electric current after described amplification and the second electric current is divided into 2N-MPart.
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