CN1954352A - Gamma correction circuit, display panel, and display having them - Google Patents

Gamma correction circuit, display panel, and display having them Download PDF

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Publication number
CN1954352A
CN1954352A CNA2005800157702A CN200580015770A CN1954352A CN 1954352 A CN1954352 A CN 1954352A CN A2005800157702 A CNA2005800157702 A CN A2005800157702A CN 200580015770 A CN200580015770 A CN 200580015770A CN 1954352 A CN1954352 A CN 1954352A
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CN
China
Prior art keywords
gamma
gamma correction
rgb
colour
shades
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Pending
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CNA2005800157702A
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Chinese (zh)
Inventor
中田健一
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Rohm Co Ltd
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Rohm Co Ltd
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Publication of CN1954352A publication Critical patent/CN1954352A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • 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
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information

Abstract

The display (1) comprises a gamma correcting circuit (5a) including a gamma data output circuit (11a) for outputting gamma correction data for each color of RGB, registers (121 to 12m) receiving and holding the gamma correction data, and D/A converters (DAC) (131 to 13m) for converting the data in the registers (121 to 12m) into analog voltages and outputting gamma correction setting voltages VI1 to VIm, a source driver (6) receiving image data, selecting gamma correction setting voltages or their interpolation voltages in accordance with the image data, and thereby outputting a corrected image voltage, and a display panel (7) in which gate lines are connected to display elements each displaying one color are driven by a gate driver (8) and the corrected image voltage from the source driver (6) is inputted into a source line. The display having a display panel the color balance of which can be adjusted.

Description

Gamma-correction circuit, display screen and possess their display device
Technical field
[0001]
The present invention relates to gamma-correction circuit and display screen.In addition, relate to the display device such as liquid crystal indicator that comprise gamma-correction circuit and display screen.
Background technology
[0002]
In general, in the display screen of display device such as liquid crystal indicator, between the impressed voltage and brightness of display element, there is nonlinear mutual relationship, is gamma characteristic.Fig. 5 illustrates general gamma characteristic.The curve A of the solid line among Fig. 5 is not revise (gamma correction) image voltage (V for example 1Or V m), the characteristic (gamma characteristic) of the display element of the liquid crystal during as impressed voltage intactly with it.In the figure, transverse axis is an impressed voltage, and the longitudinal axis is the brightness (being the light transmission rate of liquid crystal) of relativity.Now, suppose not image voltage (V for example 1Or V m) carry out gamma correction, intactly with it as impressed voltage, so because according to this nonlinear relation, so can not show good image.Like this, in order to show good image, just will be along mutual relationship---the straight line B of dotted line of the linearity of image voltage and brightness, to image voltage (V for example 1Or V m) the corrected image voltage (VI for example that carries out obtaining behind the gamma correction 1Or VI m), as impressed voltage.
[0003]
Like this, in liquid crystal indicator, as the gamma-correction circuit that carries out gamma correction, for example patent documentation 1,2 and 3 disclosed technology are widely known by the people.In addition, the present patent application people has proposed in patent documentation 4 the disclosed technology of these patent documentations gamma-correction circuit of technology as a setting.Fig. 6 represents to comprise the liquid crystal indicator with the same gamma-correction circuit of patent documentation 4.This liquid crystal indicator 101 comprises: output gamma correction setting voltage VI 1～VI mGamma-correction circuit 105a; The pictorial data Di of output n bit (for example 8 bits) selects the gamma correction setting voltage VI corresponding with it 1～VI mOr their the interpolation voltage of hereinafter telling about, thereby with corrected image voltage Vo as impressed voltage, according to its source electrode line, to the source electrode driver 6 of display screen 107 outputs of hereinafter telling about; Display screen 107; Drive the gate drivers 8 of the gate line of display screen 107; Preserve the nonvolatile memory 109 of gamma correction data.
[0004]
Gamma-correction circuit 105a comprises: will do the gamma correction data of media from the serial of outside input by input terminal SD, and be transformed into and be equivalent to gamma correction setting voltage VI 1～VI mNumerical data---the gamma correction data output circuit 111a that exports after the parallel gamma correction data of L bit (for example 10 bits); Import m (for example 9) register 12 that keeps after this parallel gamma correction data 1～12 mWith register 12 1～12 mThe data conversion of output becomes the D/A transducer (DAC) 13 of for example 10 bits of aanalogvoltage 1～13 mInput D/A transducer (DAC) 13 1～13 mThe aanalogvoltage of output, behind the raising current capacity, output gamma correction setting voltage VI 1～VI mImpact damper 14 1～14 mIn addition, gamma correction data output circuit 111a is saved in gamma correction data in the nonvolatile memory 109, takes out from nonvolatile memory 109 as required.
[0005]
Source electrode driver 6 comprises: use the output of the individual resistance of m ' at gamma-correction circuit 105a---gamma correction setting voltage VI 1～VI mIn (V for example between the voltage of adjacency 1And V 2Between) equably after the interpolation, generate the resistance string 15 of interpolation voltage; According to the pictorial data Di of n bit, select gamma correction setting voltage VI 1～VI mOr behind their the interpolation voltage, export the demoder 16 of corrected image voltage Vo.Import the display screen 107 of corrected image voltage Vo, have 2 nGray scale.In other words, be 8 if establish n, the gray scale of display screen 107 just becomes 256 so.In addition, the value of m ' can be with 2 n/ (m-1) obtain.In other words, if establishing n is 8, m is 9, m ' just becomes 32 so.For example: if the value of pictorial data Di is 0, so corrected image voltage Vo just becomes and VI 1The voltage that equates; If the value of pictorial data Di is 16, so corrected image voltage Vo just becomes VI 1And VI 2The voltage of central authorities.
[0006]
During adjustment, the demonstration of real-time confirmation display screen 107, SD does media by input terminal, and the gamma correction data of serial is imported gamma-correction circuit 105a from the outside, thereby with gamma correction setting voltage VI 1～VI mBe adjusted to suitable value.After adjustment finishes, deposit the finish gamma correction data of state of adjustment in nonvolatile memory 109, use the gamma correction data of being preserved later on by nonvolatile memory 109.
[0007]
Then, Fig. 7 represent to have with patent documentation 4 in the liquid crystal indicator of the same inscape of other embodiment.This liquid crystal indicator 102, comprise the circuit structure identical in fact or source electrode driver 6, display screen 107, gate drivers 8 and the nonvolatile memory 109 of identical construction with above-mentioned liquid crystal indicator 101, replace gamma-correction circuit 105a, comprise the structure gamma-correction circuit 105b different with it.This gamma-correction circuit 105b comprises: gamma correction data output circuit 111b; 2 groups of m registers 12 of the data that maintenance is corresponding with the odd number/even number of the horizontal line (horizontal direction sweep trace) of display screen 107 1A～12 mA, 12 1B～12 mB; After switching a certain group that selects wherein, to the D/A transducer of hereinafter telling about 13 1～13 mThe selector switch 117 of output 1～117 mHorizontal synchronizing signal---the horizontal-drive signal HS of input panel 107, according to horizontal odd number/even number, switching controls selector switch 117 1～117 m Selection control circuit 118; D/A transducer 13 1～13 mImpact damper 14a 1～14a mThis gamma-correction circuit 105b on the basis of the function that possesses gamma-correction circuit 105a, can also change gamma correction setting voltage VI at a high speed according to horizontal odd number/even number 1～VI mSo, the driving method of the line inversion mode of the polarity that the horizontal line counter-rotating about being suitable for for example using is positive and negative etc.
[0008]
Then, Fig. 8 represent to have with patent documentation 4 in the liquid crystal indicator of the same inscape of other embodiment of another kind.This liquid crystal indicator 103, comprise the circuit structure identical in fact or source electrode driver 6, display screen 107, gate drivers 8 and the nonvolatile memory 109 of identical construction with above-mentioned liquid crystal indicator 101,102, replace gamma-correction circuit 105a, 105b, comprise the structure gamma-correction circuit 105c different with it.This gamma-correction circuit 105c comprises: gamma correction data output circuit 111b; 2 groups of m registers 12 that keep data corresponding with the horizontal odd number/even number of display screen 107 1A～12 mA, 12 1B～12 mB; With they direct-connected 2 groups of m D/A transducers 13 1A～13 mA, 13 1B～13 mB; After switching a certain group that selects wherein, to the impact damper of hereinafter telling about 14 1～14 mThe selector switch 117 of output 1～117 mAccording to horizontal-drive signal HS, switching controls selector switch 117 1～117 m Selection control circuit 118; Impact damper 14 1～14 mThis gamma-correction circuit 105c, though the same with gamma-correction circuit 105b, the driving method of the line inversion mode of the polarity that the horizontal line counter-rotating about being suitable for for example using is positive and negative etc.But because can change gamma correction setting voltage VI more at a high speed according to horizontal odd number/even number 1～VI mSo, be more suitable for the high device of horizontal frequency of display screen 107.
[0009]
Patent documentation 1: the spy of Japan opens flat 10-108040 communique
Patent documentation 2: the spy of Japan opens flat 11-32237 communique
Patent documentation 3: No. 5796384 instructions of United States Patent (USP)
Patent documentation 4: Japan's special hope 2002-326266 communique (spy of Japan opens the 2004-165749 communique)
[0010]
Like this, in liquid crystal indicator 101,102,103, as one man adjust gamma correction setting voltage VI with display screen 107 one by one 1～VI mThereby, carry out suitable gamma correction.
[0011]
, advance in the past few years, color liquid crystal display arrangement is popularized rapidly, and is higher to the requirement of the big pictureization that shows and high-qualityization.The display screen of color liquid crystal display arrangement, shown in Fig. 9 (a), of all kinds for RGB, a plurality of display elements of two-dimensional arrangements respectively, on column direction according to the order stripe-arrangement of R look (red), G look (green), B look (indigo plant).This figure (b) is the circuit diagram corresponding with the Pareto diagram of (a).The display element of delegation is with a gate lines G i (or Gi + 1Deng) connect, according to the order setting of R look, G look, B look.The display element of one row is with a source electrode line Sj (or Sj + 1Deng) connect, constitute by a color in the RGB.
[0012]
And, show in order to obtain good image, need obtain the balance (being color balance) of brightness for the RGB shades of colour, in order to avoid to specific color displacement., when making display screen, because the characteristic deviation of backlight or chromatic filter etc. is only mobile a little to particular color when causing color unbalance, visual integral body phenomenon such as turn blue for example will appear making.The present patent application people also considers the progress of the big pictureization of demonstration, in order to realize the high quality of image, is conceived to improve gamma-correction circuit and display screen, and the unit of adjusting the color balance of the display screen that suppresses above-mentioned phenomenon is more simply studied.
Summary of the invention
[0013]
The present invention develops at above-mentioned situation, and its purpose is to provide gamma-correction circuit, the display screen of the color balance that can adjust display screen and comprises their display device.
[0014]
The gamma-correction circuit that the embodiment of first-selection of the present invention relates to, be according to display element impressed voltage and the nonlinear mutual relationship of brightness, export the gamma-correction circuit of gamma correction setting voltage in order to revise image voltage, possess:, export the gamma correction data output circuit of a plurality of gamma correction data respectively for the shades of colour of RGB; Import a plurality of registers that keep after a plurality of gamma correction data; After the data of a plurality of registers are transformed into aanalogvoltage respectively, a plurality of D/A transducers of output gamma correction setting voltage.
[0015]
The gamma correction data output circuit of this gamma-correction circuit is preferably in when adjusting the gamma correction setting voltage, for the shades of colour of RGB, exports respectively from a plurality of gamma correction data of outside input; After adjusting the gamma correction setting voltage,, take out a plurality of gamma correction data of back output from nonvolatile memory respectively for the shades of colour of RGB.
[0016]
The gamma correction data output circuit of this gamma-correction circuit preferably according to the horizontal-drive signal of display screen, for the shades of colour of RGB, is exported a plurality of gamma correction data respectively successively.Perhaps, described a plurality of registers of this gamma-correction circuit preferably for the shades of colour setting of RGB, according to the horizontal-drive signal of display screen, are selected the data of versicolor a plurality of registers successively, input D/A transducer.Perhaps, described a plurality of registers of this gamma-correction circuit and a plurality of D/A transducer for the shades of colour setting of RGB, according to the horizontal-drive signal of display screen, are selected to export behind the versicolor gamma correction setting voltage successively.
[0017]
The display screen that other embodiment of first-selection of the present invention relates to, it is shades of colour for RGB, the a plurality of display elements of difference two-dimensional arrangements, to a plurality of display elements that are connected with selecteed gate line, add the display screen of the impressed voltage of source electrode line, a plurality of display elements that are made of a kind of color are connected with separately gate line, according to the horizontal-drive signal of display screen, select the gate line that is connected with versicolor a plurality of display elements successively.
[0018]
The display device that other embodiment of another of first-selection of the present invention relates to possesses: the gamma-correction circuit that the embodiment of first-selection of the present invention relates to; Input image data, select the gamma correction setting voltage or their interpolation voltage corresponding with it after, export the source electrode driver of corrected image voltage; Utilize the gate driver drive gate line, the above-mentioned display screen that relates to other embodiment of the first-selection of the present invention of the corrected image voltage of source electrode line input source driver.
[0019]
After adopting the embodiment of first-selection of the present invention, because gamma-correction circuit is being provided with the shades of colour for RGB, export the gamma correction data output circuit of a plurality of gamma correction data respectively, so gate line uses with the display screen that a plurality of display elements that are made of a kind of color connect, thereby can carry out gamma correction for the shades of colour of RGB.Its result can adjust the color balance of display screen.In addition, because display screen gate line separately is connected with a plurality of display elements that are made of a kind of color, according to horizontal-drive signal, select the gate line be connected with versicolor a plurality of display elements successively, so after adopting this gamma-correction circuit, can carry out gamma correction to the RGB shades of colour, adjust color balance.And, comprise the display device of these gamma-correction circuits and display screen, can show not good image to specific color displacement.
Description of drawings
[0020]
Fig. 1 is the circuit diagram of the display device that relates to of the embodiment of first-selection of the present invention.
Fig. 2 is the figure of the display screen of presentation graphs 1, (a) is the Pareto diagram of the display element of RGB, (b) is the circuit diagram corresponding with it.
Fig. 3 is the circuit diagram of the display device that relates to of other embodiment of first-selection of the present invention.
Fig. 4 is the circuit diagram of the display device that relates to of another other embodiment of first-selection of the present invention.
Fig. 5 is the figure of the general gamma characteristic of expression.
Fig. 6 is the circuit diagram of the display device of background technology.
Fig. 7 is other the circuit diagram of display device of background technology.
Fig. 8 is the circuit diagram of another other the display device of background technology.
Fig. 9 is the figure of display screen of the colour of expression background technology, (a) is the Pareto diagram of the display element of RGB, (b) is the circuit diagram corresponding with it.
[0021]
1,2,3-liquid crystal indicator (display device) among the figure:; 5a, 5b, 5c-gamma-correction circuit; The 6-source electrode driver; The 7-display screen; The 8-gate drivers; The 9-nonvolatile memory; 11a, 11b-gamma correction data output circuit; 12 1～12 mRegister among the-gamma-correction circuit 5a; 12 1R～12 mThe register of R look among R-gamma-correction circuit 5b, the 5c; 12 1G～12 mThe register of G look among G-gamma-correction circuit 5b, the 5c; 12 1B～12 mThe register of B look among B-gamma-correction circuit 5b, the 5c; 13 1～13 mD/A transducer among-gamma-correction circuit 5a, the 5b; 13 1R～13 mThe D/A transducer of R look among the R-gamma-correction circuit 5c; 13 1G～13 mThe D/A transducer of G look among the G-gamma-correction circuit 5c; 13 1B～13 mThe D/A transducer of B look among the B-gamma-correction circuit 5c.
Embodiment
[0022]
Below, with reference to accompanying drawing, tell about the best embodiment of the present invention.Fig. 1 is the circuit diagram of the liquid crystal indicator 1 that relates to of the embodiment of first-selection of the present invention.This liquid crystal indicator 1 comprises: according to the impressed voltage of the display element of liquid crystal and the nonlinear mutual relationship of brightness, export gamma correction setting voltage VI in order to revise image voltage 1～VI mGamma-correction circuit 5a; The pictorial data Di of output n bit (for example 8 bits) selects the gamma correction setting voltage VI corresponding with it 1～VI mOr their interpolation voltage, thereby with corrected image voltage Vo as impressed voltage, according to its source electrode line, to the source electrode driver 6 of the display screen hereinafter told about 7 outputs; Display screen 7 with display element of colored liquid crystal; Drive the gate drivers 8 of the gate line of display screen 7; Preserve the nonvolatile memory 9 of gamma correction data.Here, source electrode driver 6 and gate drivers 8 are identical in fact circuit structures of liquid crystal indicator 10 of telling about with preamble.
[0023]
Gamma-correction circuit 5a comprises: for the shades of colour of RGB, will do the gamma correction data of the serial that media imports successively from the outside by input terminal SD, and be transformed into and be equivalent to gamma correction setting voltage VI 1～VI mNumerical data---the gamma correction data output circuit 11a that exports after the parallel gamma correction data of L bit (for example 10 bits); Import m (for example 9) register 12 that keeps after this parallel gamma correction data 1～12 mWith register 12 1～12 mThe data conversion of output becomes the D/A transducer (DAC) 13 of for example 10 bits of aanalogvoltage 1～13 mInput D/A transducer (DAC) 13 1～13 mThe aanalogvoltage of output, behind the raising current capacity, output gamma correction setting voltage VI 1～VI mImpact damper 14 1～14 mIn addition, gamma correction data output circuit 11a is adjusting gamma correction setting voltage VI 1～VI mThe time, for the shades of colour of RGB, will do the gamma correction data of the serial that media imports successively from the outside by input terminal SD, be transformed into parallel gamma correction data after, to register 12 1～12 mIn the time of output,, gamma correction data (being R gamma correction data, G gamma correction data, B gamma correction data) is saved in the nonvolatile memory 9 for the shades of colour of RGB.And gamma correction data output circuit 11a is adjusting gamma correction setting voltage VI 1～VI mAfter, for the shades of colour of RGB,,, take out the gamma correction data that nonvolatile memory 9 is preserved successively, to register 12 for the shades of colour of RGB according to the horizontal-drive signal HS of display screen 7 1～12 mOutput.
[0024]
Display screen 7, shown in Fig. 2 (a), for the shades of colour of RGB, a plurality of display elements of two-dimensional arrangements on line direction, are arranged according to the order strip ground of R look, G look, B look respectively.This figure (b) is the circuit diagram corresponding with the Pareto diagram of (a).Row separately, i.e. separately gate lines G i + 1(or Gi + 1Deng), be connected with a plurality of display elements that constitute by a kind of color in the RGB.Row, i.e. source electrode line Gj + 1(or Gj + 1Deng), according to the order of R, G, B, be connected with a plurality of display elements.This display screen 7 according to horizontal-drive signal HS, is selected the gate lines G i that is connected with versicolor display element successively by gate drivers 8 + 1(or Gi + 1Deng), to the gate lines G i of this selection + 1(or Gi + 1Deng) a plurality of display elements of connecting, add source electrode line Sj + 1(or Sj + 1Deng) impressed voltage.
[0025]
Then, tell about adjustment gamma correction setting voltage VI 1～VI mThe time and adjusted action.At first, tell about adjustment gamma correction setting voltage VI 1～VI mThe time.For example: HS is synchronous with horizontal-drive signal, after a plurality of gamma correction data of gamma-correction circuit 5a input R color, just exports the gamma correction setting voltage VI of the R color corresponding with this gamma correction data 1～VI mBy this gamma correction setting voltage VI 1～VI mThe image voltage Vo of the R color of revising, is exported to display screen 7 as impressed voltage by source electrode driver 6.Here importantly: the gate line of selecting the display element in the display screen 7 at this moment to be connected with the R color.In other words, the display element of R color is added the gamma correction setting voltage VI of the R color corresponding with the gamma correction data of the R color of importing gamma-correction circuit 5a 1～VI mThe image voltage of corrected R color.Then, synchronous with next horizontal-drive signal HS, to a plurality of gamma correction data of gamma-correction circuit 5a input G color, the gamma correction setting voltage VI of the G color corresponding with it 1～VI mThe image voltage of the G color of revising is added to the display element of G color outward.About the B color, also carry out same action, for the shades of colour of RGB, carry out these actions repeatedly.For the shades of colour of RGB, carry out gamma correction as described above, on one side the demonstration of real-time confirmation display screen 7, change gamma correction data value on one side from the outside, suitably adjust gamma correction setting voltage VI 1～VI m
[0026]
After adjustment finishes, adjust the gamma correction data of the state that finishes, be saved in the nonvolatile memory 9, the gamma correction data of using nonvolatile memory 9 to preserve later on.Here, the gamma correction data that nonvolatile memory 9 is preserved, become with for the corresponding data of the versicolor gamma characteristic of RGB.In addition,, not only can when adjustment finishes, carry out, but also can when importing new gamma correction data, carry out from the outside with the preservation of gamma correction data to nonvolatile memory 9.
[0027]
For the shades of colour of RGB, adjusted gamma correction setting voltage VI 1～VI mAfter, the gamma correction data of using nonvolatile memory 9 to preserve.At this moment, the taking-up of the gamma correction data that nonvolatile memory 9 is preserved according to horizontal-drive signal HS, is carried out the RGB shades of colour successively.Then, for example receive horizontal-drive signal HS, after the gamma correction data of taking-up R color, these data are just by register 12 1A～12 mA output is by D/A transducer 13 1～13 mBe transformed into aanalogvoltage, by impact damper 14 1～14 mDo media, as the gamma correction setting voltage VI of R color 1～VI mOutput.By this gamma correction setting voltage VI 1～VI mThe image voltage Vo of corrected R color,, the same during at this moment with above-mentioned adjustment by source electrode driver 6 to display screen 7 outputs as external pressure voltage, in display screen 7, selected with the gate line that the display element of R color is connected.Also carry out same action for G look, B look, carry out these actions repeatedly for the shades of colour of RGB.In other words, gamma-correction circuit 5a successively to the shades of colour of RGB, exports gamma correction setting voltage VI according to horizontal-drive signal HS 1～VI m, the gate line that display screen 7 selections are connected with the display element of this color.To the shades of colour of RGB, carry out suitable gamma correction as described above.
[0028]
Like this, this gamma-correction circuit 5a can carry out gamma correction to the shades of colour of RGB, therefore can adjust the color balance of display screen.In addition, because display screen 7 gate line separately, be connected with a plurality of display elements that constitute by a kind of color, according to horizontal-drive signal HS, select the gate line be connected with versicolor a plurality of display elements successively, so can utilize gamma-correction circuit 5a that the RGB shades of colour is carried out gamma correction, can adjust color balance.And, comprise the liquid crystal indicator 1 of this gamma-correction circuit 5a and display screen 7, can show not good image to specific color displacement.
[0029]
Then, according to Fig. 3, tell about other embodiment of first-selection of the present invention---liquid crystal indicator 2.This liquid crystal indicator 2 is on the viewpoint that suppresses power consumption, and above-mentioned liquid crystal indicator 1 has been carried out improved device.This liquid crystal indicator 2, comprise the source electrode driver 6, display screen 7, gate drivers 8 and the nonvolatile memory 9 that come down to identical circuit structure or identical construction with liquid crystal indicator 1, replace gamma-correction circuit 5a, comprise the gamma-correction circuit 5b different with its structure.This gamma-correction circuit 5b comprises: gamma correction data output circuit 11b; 3 groups of m registers 12 to the setting of RGB shades of colour 1R～12 mR, 12 1G～12 mG, 12 1B～12 mB; After switching certain group of selection, to the D/A transducer of hereinafter telling about 13 1～13 mThe selector switch 17 of output 1～17 mAccording to horizontal-drive signal HS, the switching controls selector switch 17 successively 1～17 mSelector switch control circuit 18; D/A transducer 13 1～13 mImpact damper 14 1～14 m
[0030]
This gamma-correction circuit 5b when energized, to the shades of colour of RGB, takes out all gamma correction data from nonvolatile memory 9, deposits them in 3 groups of registers 12 1R～12 mR, 12 1G～12 mG, 12 1B～12 mAmong the B.To the data that the shades of colour of this RGB keeps,, selected input D/A transducer 13 successively according to horizontal-drive signal HS 1～13 m, be transformed into aanalogvoltage, by impact damper 14 1～14 mDo media, as gamma correction setting voltage VI 1～VI mOutput.Like this, this liquid crystal indicator 2, in above-mentioned liquid crystal indicator 1, when each horizontal-drive signal HS, all take out the gamma correction data of being preserved, promptly carry out the access difference to nonvolatile memory 9 by nonvolatile memory 9, only when energized, carry out access,, suppress power consumption so can reduce its number of times significantly to nonvolatile memory 9.
[0031]
Then, according to Fig. 4, tell about another other embodiment---the liquid crystal indicator 3 of first-selection of the present invention.This liquid crystal indicator 3, comprise the source electrode driver 6, display screen 7, gate drivers 8 and the nonvolatile memory 9 that come down to identical circuit structure or identical construction with above-mentioned liquid crystal indicator 1 and 2, replace gamma-correction circuit 5a or 5b, comprise the gamma-correction circuit 5c different with they structures.This gamma-correction circuit 5c comprises: gamma correction data output circuit 11b; 3 groups of m registers 12 to the setting of RGB shades of colour 1R～12 mR, 12 1G～12 mG, 12 1B～12 mB; With they direct-connected 3 groups of m D/A transducers 13 1R～13 mR, 13 1G～13 mG, 13 1B～13 mB; After switching certain group of selection, to the impact damper of hereinafter telling about 14 1～14 mThe selector switch 17 of output 1～17 mAccording to horizontal-drive signal HS, the switching controls selector switch 17 successively 1～17 mSelector switch control circuit 18; Impact damper 14 1～14 m
[0032]
This gamma-correction circuit 5c when energized, to the shades of colour of RGB, takes out all gamma correction data from nonvolatile memory 9, deposits them in 3 groups of registers 12 1R～12 mR, 12 1G～12 mG, 12 1B～12 mB is by D/A transducer 13 1R～13 mR, 13 1G～13 mG, 13 1B～13 mB is transformed into the versicolor aanalogvoltage about RGB.About the versicolor aanalogvoltage of this RGB, according to horizontal-drive signal HS, after selecting successively, input buffer 14 1～14 m, as gamma correction setting voltage VI 1～VI mOutput.Like this, this gamma-correction circuit 5c is in the power consumption that can suppress liquid crystal indicator 3, also because be transformed into simulating signal, so can switch gamma correction setting voltage VI at a high speed 1～VI mTherefore, be suitable for display screen horizontal frequency height, require the device of high speed processing.
[0033]
In addition, in above gamma-correction circuit 5a, 5b and 5c,, can also omit impact damper 14 if the electric current fan-out capability of D/A transducer (DAC) is enough big 1～14 m
[0034]
In addition, the present invention is not limited to above-mentioned embodiment, can carry out various design alterations in the scope of the clause that " claims " are recorded and narrated.For example, in the present embodiment, told about liquid crystal indicator.But gamma-correction circuit of the present invention, display screen and display device are not limited thereto, and need can also be applied to the display device (for example organic EL display) of gamma correction.

Claims (11)

1, a kind of gamma-correction circuit according to the impressed voltage of display element and the nonlinear mutual relationship between the brightness, is exported the gamma correction setting voltage in order to revise image voltage,
Described gamma-correction circuit possesses:
At the shades of colour of RGB, export the gamma correction data output circuit of a plurality of gamma correction data respectively;
Import and keep a plurality of registers of a plurality of gamma correction data;
After the data of a plurality of registers are transformed into aanalogvoltage respectively, a plurality of D/A transducers of output gamma correction setting voltage.
2, gamma-correction circuit as claimed in claim 1 is characterized in that:
Described gamma correction setting voltage is by exporting behind the impact damper.
3, gamma-correction circuit as claimed in claim 1 or 2 is characterized in that:
The gamma correction data output circuit when adjusting the gamma correction setting voltage, for the shades of colour of RGB, is exported respectively from a plurality of gamma correction data of outside input; After adjusting the gamma correction setting voltage,, after taking out a plurality of gamma correction data, exports by nonvolatile memory respectively for the shades of colour of RGB.
4, as each described gamma-correction circuit of claim 1～3, it is characterized in that:
The gamma correction data output circuit according to the horizontal-drive signal of display screen, for the shades of colour of RGB, is exported a plurality of gamma correction data respectively successively.
5, as each described gamma-correction circuit of claim 1～3, it is characterized in that:
Described a plurality of register at the shades of colour of RGB and be provided with, according to the horizontal-drive signal of display screen, is selected the data of versicolor a plurality of registers successively, is input to the D/A transducer.
6, as each described gamma-correction circuit of claim 1～3, it is characterized in that:
Described a plurality of register and a plurality of D/A transducer at the shades of colour of RGB and be provided with, according to the horizontal-drive signal of display screen, are selected to export behind the versicolor gamma correction setting voltage successively.
7, as claim 5 or 6 described gamma-correction circuits, it is characterized in that:
The described a plurality of registers that are provided with at the shades of colour of RGB, the gamma correction data of taking out at the shades of colour of RGB and from nonvolatile memory when remaining on energized.
8, a kind of display screen, at the shades of colour of RGB, a plurality of display elements of two-dimensional arrangements to a plurality of display elements that are connected with selecteed gate line, add the impressed voltage of source electrode line respectively,
The a plurality of display elements that are made of a kind of color are connected with separately gate line, according to the horizontal-drive signal of display screen, select the gate line that is connected with versicolor a plurality of display elements successively.
9, a kind of display device is characterized in that, possesses:
Each described gamma-correction circuit of claim 1～7;
Input image data, select the gamma correction setting voltage or their interpolation voltage corresponding with it after, export the source electrode driver of corrected image voltage;
Utilize the gate driver drive gate line, to the corrected image voltage of source electrode line input source driver.
10, display device as claimed in claim 9 is characterized in that:
According to horizontal-drive signal, gamma-correction circuit is exported the gamma correction setting voltage successively at the shades of colour of RGB, the gate line that the display screen selection is connected with the display element of this look.
11, as claim 9 or 10 described display device, it is characterized in that:
Display device is a liquid crystal indicator.
CNA2005800157702A 2004-03-17 2005-03-16 Gamma correction circuit, display panel, and display having them Pending CN1954352A (en)

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KR20060130231A (en) 2006-12-18

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