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CN101178886B - Liquid crystal display and its driving device - Google Patents

Liquid crystal display and its driving device Download PDF

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Publication number
CN101178886B
CN101178886B CN2007101961186A CN200710196118A CN101178886B CN 101178886 B CN101178886 B CN 101178886B CN 2007101961186 A CN2007101961186 A CN 2007101961186A CN 200710196118 A CN200710196118 A CN 200710196118A CN 101178886 B CN101178886 B CN 101178886B
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reference voltage
gamma reference
sampling
polarity
sample
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CN101178886A (en
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李升佑
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Samsung Display Co Ltd
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Samsung Electronics Co Ltd
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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
    • 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
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • 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
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3685—Details of drivers for data electrodes
    • 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
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

本发明公开了一种数据驱动器和包括其的液晶显示器，能够通过在内侧或外侧产生伽马参考电压来解决液晶显示器的问题和减少外侧输入管脚的数目。根据本发明，根据预定的伽马负载信号，通过预定数据总线从外部装置向数字伽马存储器提供R、G和B中每一个的数字伽马数据，并且伽马参考电压发生器产生用于灰度显示的伽马参考电压，这些电压用于根据所存储的R、G和B中每一个的数字伽马数据，独立地针对R、G和B中的每一个将显示数据转换为模拟数据。数字模拟转换器根据产生的伽马参考电压将R、G和B中每一个的图像数据转换为模拟电压，并输出它们。结果，通过产生R、G和B中每一个的伽马参考电压而不从外部装置接收它们，并以使得R、G和B中的每一个具有独立伽马曲线的方式进行控制，可以解决液晶显示器的图像质量问题，以及减少外侧输入管脚的数目。

Figure 200710196118

The invention discloses a data driver and a liquid crystal display including the same, capable of solving the problems of the liquid crystal display and reducing the number of input pins on the outside by generating a gamma reference voltage inside or outside. According to the present invention, according to a predetermined gamma load signal, digital gamma data for each of R, G, and B is supplied from an external device to a digital gamma memory through a predetermined data bus, and a gamma reference voltage generator generates Display gamma reference voltages for converting display data into analog data independently for each of R, G, and B based on stored digital gamma data for each of R, G, and B. The digital-to-analog converter converts the image data of each of R, G, and B into analog voltages based on the generated gamma reference voltage, and outputs them. As a result, by generating gamma reference voltages for each of R, G, and B without receiving them from an external device, and controlling them in such a way that each of R, G, and B has an independent gamma curve, it is possible to solve liquid crystal Display image quality issues, and reducing the number of external input pins.

Figure 200710196118

Description

LCD and drive unit thereof
Present patent application be that on 07 23rd, 2002, application number are 02826265.4 the applying date, exercise question divides an application for the patented claim of " LCD and drive unit thereof ".
Technical field
The present invention relates to a kind of LCD and drive unit thereof.
Background technology
Typical liquid crystal (" LCD ") comprises the last deck panels with public electrode and color filter array, and the lower floor's panel with a plurality of thin film transistor (TFT)s (" TFT ") and a plurality of pixel electrodes.These two panels have respectively and cover top alignment film, and liquid crystal layer is got involved between these two panels.Pixel electrode and public electrode have been applied in voltage, and the voltage difference between them produces electric field.The variation of this electric field changes the orientation of liquid crystal molecule in liquid crystal layer, changes the optical transmission coefficient that passes liquid crystal layer conversely again, obtains desired images thus.
Typical LCD data driver comprises shift register, data register, data latches, digital-to-analog (" D/A ") converter and output buffer.Data driver synchronously latchs the redness (" RED ") of order input, green (" G ") and blue (" B ") data with the Dot Clock from timing controller, and timing system changed to line order mechanism from dot sequency mechanism, with data line output data voltage to the liquid crystal panel assembly.D/A converter will be converted to corresponding aanalogvoltage from the RGB data of data latches according to the gamma reference voltage VGMA1 to VGMA18 that provides from external device (ED).
Common LCD uses identical signal to R, G with the B pixel, supposes that wherein their optical characteristics is identical, but is actually different.A problem appears in the result, and the color impression imbalance or the deviation of each gray scale are too big.
In order to address this problem, having proposed provides different sets of gamma reference voltages to R, G respectively with the B color.But, and to compare in the past, this number of pins with data driver has increased by 36, thereby has increased the size of data driver.In addition, the piece number that is used to produce the unit of gamma reference voltage increases, and, produces 3 of corresponding sets of gamma reference voltages of R, G and B color respectively that is.Exist a problem to be like this, the increase of the erection space of data driver has improved the production cost of LCD in the increase of external circuit and the printed circuit board (PCB) (" PCB ").
Summary of the invention
The objective of the invention is to improve the picture quality of LCD by produce sets of gamma reference voltages independently respectively for R, G and B color.
In order to finish this purpose, the invention provides a kind of LCD, comprising: timing controller, the digital gamma data of each among output R, G and the B; The gamma reference voltage generator will be converted to simulated data from the digital gamma data of this timing controller, to produce gamma reference voltage; And data driver, comprising: sampling/holding unit, at gamma reference voltage that output after carrying out sampling/maintenance processing from the gamma reference voltage of this gamma reference voltage generator is sampled; And digital analog converter, according to the sampling gamma reference voltage view data of each among R, G and the B is converted to aanalogvoltage and exports them.
In order to finish this purpose, the present invention also provides a kind of drive unit of LCD, output is used to show the data voltage of the image of LCD, described drive unit comprises: sampling/holding unit, the gamma reference voltage that produces in the outside is carried out sampling/maintenance handle, with output sampling gamma reference voltage; And digital analog converter, according to the sampling gamma reference voltage view data of each among R, G and the B is converted to aanalogvoltage, and exports them.
Description of drawings
By being described in detail with reference to the attached drawings embodiments of the invention, it is more obvious that above and other objects of the present invention and advantage will become, wherein:
Fig. 1 is the synoptic diagram according to the data driver of the embodiment of the invention;
Fig. 2 is the figure of explanation gamma reference voltage generator shown in Figure 1;
Fig. 3 and Fig. 4 partly illustrate exemplary data driver according to the first and second aspects of the present invention respectively;
Fig. 5 is the figure according to the example sampled/holding circuit of the gamma reference voltage generator of second embodiment of the invention;
Fig. 6 and Fig. 7 partly illustrate the exemplary data driver of third and fourth embodiment according to the present invention respectively;
Fig. 8 is the figure according to the example sampled/holding circuit of the gamma reference voltage generator of fourth embodiment of the invention;
Fig. 9 to Figure 11 partly illustrates the exemplary data driver of the 5th to the 7th embodiment according to the present invention;
Figure 12 is the figure of explanation according to the example sampled/holding circuit of the gamma reference voltage generator of the embodiment of the invention;
Figure 13 to Figure 18 partly illustrates the exemplary data driver of the 8th to the 13 embodiment according to the present invention.
Embodiment
Accompanying drawing below with reference to the preferred embodiment of the present invention shown in it is more fully described the present invention.But the present invention can be implemented as a lot of different forms, and should not be interpreted as being subject to the embodiment that proposes here.Identical Reference numeral is quoted components identical all the time.
Now, be described in detail with reference to the attached drawings LCD and drive unit thereof according to various embodiments of the present invention.
With reference to figure 1 and Fig. 2, with data driver and the gamma reference voltage generator of describing in detail according to the embodiment of the invention.
Fig. 1 is the synoptic diagram according to the exemplary data driver of the embodiment of the invention, and the configuration of the exemplary gamma reference voltage generator shown in Fig. 2 key diagram 1.
As shown in Figure 1, the data driver 10 according to the embodiment of the invention comprises gamma register 100, gamma reference voltage generator 200, shift register 300, data register 400, data latches 500, D/A converter 600 and output buffer 700.R, the G of shift register 300 controller of self-timing in the future (not shown) and B data (D0[7:0]-D5[7:0]) be shifted, and in data register 400, store these data.D/A converter 600 receives the data that are stored in the data register 400 from data latches 500, and these data are converted to analog gray voltages.The analog gray voltages that output buffer 700 is stored from D/A converter 600, and when receiving load signal, this analog gray voltages is applied on a plurality of data lines.The digital gamma data of gamma register 100 storage each R, G and B color, and gamma reference voltage generator 200 produces a plurality of sets of gamma reference voltages of each R, G and B color according to being stored in value in the gamma register 100, to offer D/A converter 600.
As shown in Figure 2, gamma register 100 receives digital gamma data by a plurality of data buss from the timing controller (not shown), and response gamma load signal GMA_load stores this digital gamma data.Gamma reference voltage generator 200 is connected to two external voltage source AVDD and GND, and the digital gamma data of shades of colour and various polarity is converted to the analogue value, with as just/negative reference voltage offers D/A converter 600.
Describe the gamma reference voltage generator of a plurality of embodiment according to the present invention now in detail.In these embodiment of the present invention, the number that is assumed to be the digital gamma data group that gamma reference voltage generator 200 provides equals 9 * 2 * 3, promptly positive R, G and B digital gamma data D V1R-D V9R, D V1G-D V9GAnd D V1B-D V9B, and negative R, G and B digital gamma data D V10R-D V18R, DV 10G-D V18GAnd D V10B-D V18BBut, the invention is not restricted to this, but be applicable to the digital gamma data group of any number.
At first, with reference to the gamma reference voltage generator of figure 3 explanations according to first embodiment of the invention.
Fig. 3 is the figure of explanation according to the exemplary gamma reference voltage generator of first embodiment of the invention.
As shown in Figure 3, the gamma reference voltage generator 200 according to first embodiment of the invention comprises positive gamma reference voltage generator 210 and the negative gamma reference voltage generator 240 that produces the positive and negative gamma electric voltage respectively.
In this embodiment, gamma reference voltage generator 200 receives the digital gamma data of each R, G and B color simultaneously from gamma register 100, and each D/A converter (" DAC ") 221-223 and 251-253 produce corresponding gamma reference voltage.In order to make gamma reference voltage generator 200 produce all R, G and B gamma reference voltage, DAC221-223 that provides in gamma reference voltage generator 200 and the number of 251-253 are corresponding to the number of R, G and B digital gamma data.For example, the gamma reference voltage generator 200 according to first embodiment of the invention preferably includes 9 * 2 * 3 DAC.
In detail, positive gamma reference voltage generator 210 is for each R, G and B color comprise 9 DAC 221-223, and positive R, the G of analog-converted correspondence and B digital gamma data DV1R-DV9R, DV1G-DV9G and DV1B-DV9B are to produce positive R, G and B gamma reference voltage V1R-V9R, V1G-V9G and V1B-V9B separately.Equally, negative gamma reference voltage generator 240 is for each R, G and B color comprise 9 DAC 251-253, separately with positive R, the G of correspondence and B digital gamma data DV10R-DV18R, DV10G-DV18G and DV10B-DV18B analog-converted for bearing R, G and B gamma reference voltage V10R-V18R, V10G-V18G and V10B-V18B.
D/A converter 600 is converted to aanalogvoltage according to the positive and negative gamma reference voltage V1R-V9R, V1G-V9G, V1B-V9B, V10R-V18R, V10G-V18G and the V10B-V18B that provide from DAC 221-223 and 251-253 with R, G and B view data R0, G0, B0, R1, G1, B1....
Simultaneously, the number of DAC can reduce with respect to first embodiment of the invention in the gamma reference voltage generator 200, below, will such embodiment be described with reference to figure 4 to 12.
At first, with reference to the gamma reference voltage generator of Figure 4 and 5 description according to second embodiment of the invention.
Fig. 4 is the figure of explanation according to the exemplary gamma reference voltage generator of second embodiment of the invention, and Fig. 5 illustrates the circuit diagram that is included in according to the example sampled/holding circuit in the gamma reference voltage generator of second embodiment of the invention.
As shown in Figure 4, gamma reference voltage generator 200 according to second embodiment of the invention also comprises positive and negative gamma reference voltage generator 210 and 240, and the gamma reference voltage generator 210 and 240 of positive and negative includes DAC unit 220 and 250 and sampling/ holding unit 230 and 260.
DAC unit 220 comprises 9 DAC, be used for analog-converted according to positive digital gamma data DV1R-DV9R, the DV1G-DV9G of the input of the timesharing of each R, G and B color mechanism and DV1B-DV9B to produce positive R, G and B gamma reference voltage V1R-V9R, V1G-V9G and V1B-V9B.Sampling/holding unit 230 comprises a plurality of sample/hold circuits unit (S/HI) 231-233, and positive R, G and B gamma reference voltage V1R-V9R, V1G-V9G and V1B-V9B from DAC unit 220 are used to sample.Equally, DAC unit 250 comprises 9 DAC, is used for analog-converted and bears R, G and B gamma reference voltage V10R-V18R, V10G-V18G and V10B-V18B according to machine-processed negative word gamma data DV10R-DV18R, DV10G-DV18G that imports of the timesharing of each R, G and B color and DV10B-DV18B to produce.Sampling/holding unit 260 comprises a plurality of sample/hold circuits unit (S/HI) 261-263, and negative gamma reference voltage V10R-V18R, V10G-V18G and V10B-V18B from DAC unit 250 are used to sample.
In detail, 231 samplings positive R gamma reference voltage V1R-V9R in R sample/hold circuit unit is to offer D/A converter 600.D/A converter 600 will be converted to aanalogvoltage from R view data R0, the R1... of data latches 500 according to the positive R gamma reference voltage V1R-V9R of sampling.According to identical mode, G and B sample/ hold circuit unit 262 and 263 sample respectively positive G gamma reference voltage V1G-V9G and positive B gamma reference voltage V1B-V9B are to offer D/A converter 600.DAC unit 250 in the negative gamma reference voltage generator 240 and sampling/holding unit 260 analog-converted negative R, G and B digital gamma data, bear R, G and B gamma reference voltage V10R-V18R, V10G-V18G and V10B-V18B to produce, and sample to offer D/A converter 600.
Describe the sample/hold circuit unit 231-233 of sampling/ holding unit 230 and 260 and a unit 231 among the 261-263 in detail below with reference to Fig. 5.
Sampling/holding unit 231 comprises 9 sample/hold circuits, is respectively applied for the positive R gamma reference voltage from 9 DAC of DAC unit 220 is sampled.Each sample/hold circuit comprises switch SW, capacitor C1 and impact damper buf.When switch SW response sample commencing signal and when closed, be stored among the capacitor C1 and be sampled from the gamma reference voltage of DAC, and the gamma reference voltage of being sampled offer D/A converter 600 by analogue buffer.
The DAC number that provides in the gamma reference voltage generator 200 according to second embodiment of the invention equals 9+9=18, is reduced to according to 1/3 of the number of the invention described above first embodiment.
Although second embodiment of the invention adopts independent DAC unit respectively for positive polarity and negative polarity, also can use the DAC that can support positive polarity can support negative polarity again.Below, with reference to figure 6 such embodiment is described.
Fig. 6 is the figure according to the exemplary gamma reference voltage generator of third embodiment of the invention.
As shown in Figure 6, except using for the positive and negative digital gamma data the single DAC unit 220, almost identical with second embodiment according to the gamma reference voltage generator 200 of third embodiment of the invention.
In detail, DAC unit 220 comprises 9 DAC, and analog-converted is according to positive R, G and B digital gamma data DV1R-DV9R, DV1G-DV9G and the DV1B-DV9B of the timesharing mechanism order input of each R, G and B color and polarity, and negative R, G and B digital gamma data DV10R-DV18R, DV10G-DV18G and DV10B-DV18B, to produce positive and negative R, G, B gamma reference voltage V1R-V9R, V1G-V9G, V1B-V9B, V10R-V18R, V10G-V18G and V10B-V18B.In addition, DAC unit 220 provides positive and negative R, G, B gamma reference voltage to two sampling/ holding units 230 and 260 respectively.Sampling/holding unit 230 with 260 basically with second embodiment of the invention in describe identical.
The DAC number that is provided in the gamma reference voltage generator 200 according to third embodiment of the invention is 9, is reduced to according to 1/6 of the number of first embodiment of the invention.
According to the of the present invention second and the 3rd embodiment, because the timing controller (not shown) is imported R, G and B digital gamma data according to the timesharing mechanism order of each R, G and B color, therefore number and this digital gamma data of the DAC that provides in the DAC unit are to concern one to one.But 18 digital gamma data of each R, G and B color can be imported in proper order.Describe such embodiment in detail below with reference to accompanying drawing.
At first, with reference to figure 7 and the 8 gamma reference voltage generators of describing according to fourth embodiment of the invention.
Fig. 7 is the figure according to the exemplary gamma reference voltage generator of fourth embodiment of the invention, and the example sampled/holding circuit unit that is provided in the gamma reference voltage generator of Fig. 8 explanation according to fourth embodiment of the invention.
As shown in Figure 7, gamma reference voltage generator 200 also comprises the positive and negative gamma reference voltage generator 210 and 240 as first embodiment.Positive gamma reference voltage generator 210 comprises 3 DAC221-223 that correspond respectively to positive R, G and B digital gamma data DV1R-DV9R, DV1G-DV9G and DV1B-DV9B, and 3 sampling/holding unit 231-233 that are connected to corresponding DAC221-223.According to identical mode, negative gamma reference voltage generator 240 comprises 3 DAC251-253 and 3 sampling/holding unit 261-263 that correspond respectively to R, G and B digital gamma data DV10R-DV18R, DV10G-DV18G and DV10B-DV18B.
As shown in Figure 7, be input to DAC221-223 and 251-253 from positive and negative R, the G of timing controller and B digital gamma data DV1R-DV9R, DV1G-DV9G, DV1B-DV9B, DV10R-DV18R, DV10G-DV18G and DV10B-DV18B according to corresponding R, G and B color and corresponding polarity serial.DAC221-223 and these digital gamma data of 251-253 analog-converted, and to positive and negative gamma reference voltage V1R-V9R, V1G-V9G, V1B-V9B, V10R-V18R, V10G-V18G and the V10B-V18B of corresponding sample/hold circuit unit 231-233 and 261-263 serial output through analog-converted.Sample/hold circuit unit 231-233 and 261-263 sample to positive and negative gamma reference voltage V1R-V9R, V1G-V9G, V1B-V9B, V10R-V18R, V10G-V18G and V10B-V18B respectively, to offer D/A converter 600.
Each sample/hold circuit unit 231-233 of the second and the 3rd embodiment and 261-263 sample simultaneously and export 9 gamma reference voltages according to the present invention although Fig. 5 is described, sequentially sample and export the gamma reference voltage of serial input according to the sample/hold circuit unit 231-233 of fourth embodiment of the invention and 261-263.For example, as shown in Figure 8, a sample/hold circuit unit 231 comprises 9 sample/hold circuits that are connected to DAC 221 output terminals.This sample/hold circuit comprises: switch SW is used for the gamma reference voltage of switch from DAC 221; Capacitor C1 is used to store the gamma reference voltage by the switch SW input; Analogue buffer buf is used for exporting the gamma reference voltage that is stored in capacitor C1 to D/A converter 600; And shift register S/R, be used for transmitting the sampling commencing signal that is used for the gauge tap closed and disconnected to next sample/hold circuit.
231 responses of sample/hold circuit unit are by the displacement of the sampling commencing signal of shift register S/R, and order output is from the gamma reference voltage of DAC 221.
According to fourth embodiment of the invention, because gamma reference voltage generator 200 adopts 6 DAC to be respectively applied for positive and negative R, G and B color, so the decreased number of DAC is according to 1/3 of the number of second embodiment.
Although each R, G and DAC of B color assignment for having each polarity in the fourth embodiment of the present invention, DAC can be uncorrelated with polarity.Below with reference to Fig. 9 such embodiment is described.
Fig. 9 is the figure of explanation according to the exemplary gamma reference voltage generator of fifth embodiment of the invention.
As shown in Figure 9, comprise R, G and B gamma reference voltage generator 210r, 210g and 210b, be used to produce corresponding R, G and B gamma reference voltage according to the gamma reference voltage generator 200 of fifth embodiment of the invention.Each R, G and B gamma reference voltage generator 210r, 210g and 210b comprise DAC 220r, 220g and 220b and sampling/ holding unit 230r, 230g and 230b respectively, and each sampling/ holding unit 230r, 230g and 230b comprise two sample/hold circuit unit (S/HII ') 231r and 232r, 231g and 232g and 231b and 232b.DAC 220r, 220g and 220b analog-converted be from R, G and B digital gamma data DV1R-DV18R, DV1G-DV18G and the DV1B-DV18B of timing controller serial received, and respectively to sampling/ holding unit 230r, 230g and 230b output R, G and B gamma reference voltage V1R-V18R, V1G-V18G and the V1B-V18B through analog-converted.In sampling/ holding unit 230r, 230g and 230b, except the sampling commencing signal of output as sample/ hold circuit unit 232r, 232g and 232b of last shift register S/R of sample/ hold circuit unit 231r, 231g and 231b, that describes among sample/ hold circuit unit 231r and 232r, 231g and 232g and 231b and 232b and Fig. 8 is identical.
In detail, sample/hold circuit unit 231r carries out sequential sampling according to the sampling commencing signal to the positive R gamma reference voltage V1R-V9R from the R gamma reference voltage V1R-V18R of DAC 220r serial output, and export them to D/A converter 600, and sample/hold circuit unit 232r carries out sequential sampling according to the output of last shift register S/R of sample/hold circuit unit 231r to negative R gamma reference voltage V10R-V18R, and exports them to D/A converter 600.According to identical mode, sample/ hold circuit unit 231g and 231b align G and B gamma reference voltage V1G-V9G and V1B-V9B respectively and carry out sequential sampling according to the sampling commencing signal, and sample/ hold circuit unit 232g and 232b carry out sequential sampling to negative G and B gamma reference voltage V10G-V18G and V10B-V18B respectively according to the output of last shift register S/R of sample/ hold circuit unit 231g and 231b.
According to a fifth embodiment of the invention, the decreased number of DAC is half of the 4th embodiment.Although the 5th embodiment has DAC among R, G and the B each, DAC can also be used for every kind of polarity.Below with reference to Figure 10 such embodiment is described.
Figure 10 explanation is according to the exemplary gamma reference voltage generator of sixth embodiment of the invention.
As shown in figure 10, comprise positive and negative gamma reference voltage generator 210 and 240 according to the gamma reference voltage generator of sixth embodiment of the invention as first embodiment of the invention.Positive gamma reference voltage generator 210 comprises a DAC 220 and has sampling/holding unit 230 of 3 sample/hold circuit unit 231-233.Negative gamma reference voltage generator 240 comprises a DAC 250 and has sampling/holding unit 260 of 3 sample/hold circuit unit 262-263.
The positive R of DAC 220 serial received, G and B digital gamma data DV1 R-DV9R, DV1G-DV9G, DV1B-DV9B converting them to gamma reference voltage V1R-V9R, V1G-V9G, V1B-V9B, and output to sampling/holding unit 230 with it.According to same way as, DAC 250 serial received negative R, G and B digital gamma data DV10R-DV18R, DV10G-DV18G and DV10B-DV18B, converting them to gamma reference voltage V10R-V18R, V10G-V18G and V10B-V18B, and it is outputed to sampling/holding unit 260.
The sample/hold circuit unit 231-233 of sampling/holding unit 230 aligns R, G respectively and B gamma reference voltage V1R-V9R, V1G-V9G, V1B-V9B sample, as described in the 5th embodiment, except the output of last shift register S/R of sample/ hold circuit unit 231 and 232 becomes respectively the sampling commencing signal of sample/ hold circuit unit 232 and 233, these sample/hold circuit unit are identical with the described sample/hold circuit of Fig. 8 unit.According to identical mode, the sample/hold circuit unit 261-263 of sampling/holding unit 260 samples to bearing R, G and B gamma reference voltage V10R-V18R, V10G-V18G and V10B-V18B respectively.
Gamma reference voltage generator according to sixth embodiment of the invention has only used two DAC.
Simultaneously, produce among R, G and the B gamma reference voltage of each for the polarity of not considering gamma reference voltage, can only use a DAC.Below with reference to Figure 11 such embodiment is described.
Figure 11 is the figure of explanation according to the exemplary gamma reference voltage generator of seventh embodiment of the invention.
As shown in figure 11, comprise a DAC 220 and sampling/holding unit 230 according to the gamma reference voltage generator 200 of seventh embodiment of the invention, and sample/holding unit 230 comprises 6 sample/hold circuit unit 231-233 and 261-263.Provide positive and negative R, G, B digital gamma data DV1R-DV9R, DV1G-DV9G, DV1B-DV9B, DV10R-DV18R, DV10G-DV18G and DV10B-DV18B to DAC 220 serials, converting them to positive and negative R, G, B gamma reference voltage V1R-V9R, V1G-V9G, V1B-V9B, V10R-V18R, V10G-V18G and V10B-V18B, and export them to sampling/holding unit 230.With describe among the 6th embodiment identical, the sample/hold circuit unit 231-233 of sampling/holding unit 230 aligns R, G and B gamma reference voltage V1R-V9R, V1G-V9G, V1B-V9B sample, and the output of last shift register of sample/hold circuit unit 233 becomes the sampling commencing signal of sample/hold circuit unit 261.Then, sample/hold circuit unit 261-263 samples to negative R, G and B gamma reference voltage V10R-V18R, V10G-V18G, V10B-V18B according to this sampling commencing signal.
Above-mentioned the 7th embodiment according to the present invention has only a DAC to be used to produce gamma reference voltage.
Simultaneously, the time that the generation gamma reference voltage of the second and the 3rd embodiment is spent is respectively 3 times and 6 times of first embodiment, and the time that the generation gamma reference voltage of the 4th and the 5th embodiment is spent is respectively 9 times and 18 times of first embodiment.The time that the generation gamma reference voltage of the 7th embodiment is spent is 54 times of first embodiment.
Suppose that it is 1 μ s that a DAC produces the time that gamma reference voltage spent, then the DAC of Fig. 5 spends 1 μ s, and the DAC of Figure 11 spends 54 μ s.Because this time is shorter than the blank time interval that interframe does not have data, so display screen can not go wrong.
But, cause in this time under the situation of problem, can adopt sample/hold circuit cell S/HIII to reduce the time.
Figure 12 illustrates example sampled/holding circuit S/H III according to another embodiment of the present invention.
As shown in figure 12, sample/hold circuit cell S/H comprises 9 sample/hold circuits that are connected to the DAC output terminal according to another embodiment of the present invention, and this sample/hold circuit comprises switch SW, shift register S/R, capacitor C1 and C2, analogue buffer buf and input and output switch S 1 and S2.According to sampling commencing signal operating switch SW, to send the gamma reference voltage from DAC, shift register S/R transmits the sampling commencing signal to next sample/hold circuit.Capacitor C1 and C2 are connected to first and second paths, thus the gamma reference voltage charging to transmit along first and second paths, and the gamma reference voltage that analogue buffer buf charges in capacitor C1 and C2 to D/A converter 600 outputs.In this case, input switch S1 is connected between the switch SW and first and second paths, thereby according to selecting signal between first and second paths, to replace, and output switch S 2 is connected between first and second paths and the analogue buffer, thereby according to selecting signal between first and second paths, to replace.
In this sample/hold circuit cell S/H III, according to transmit the sampling commencing signal by shift register S/R, order output is from the gamma reference voltage of a terminal input.
The operation of sample/hold circuit cell S/H III is described below.
When existing gamma electric voltage is stored among the capacitor C2, the gamma reference voltage that changes is stored among the capacitor C1, thereby with the gamma reference voltage that capacitance stores was changed corresponding to capacitor C1, after this, by changing the gamma reference voltage of selecting signal to come output capacitor C1.Then, change gamma reference voltage in a short period of time.When keeping this state and changing gamma reference voltage, new gamma reference voltage is stored among the capacitor C2, and after finishing the new gamma reference voltage of storage, only exports the gamma reference voltage that charges in capacitor C2.
In the foregoing description and following embodiment, can use this sample/hold circuit S/H III to substitute sample/hold circuit S/H II and S/H II '.
The embodiment that a lot is used at the inboard of data driver 10 generation gamma reference voltage and reduces to be used to produce the DAC area occupied of gamma reference voltage has been described in the above.
Simultaneously, the DAC that is used to produce gamma reference voltage can realize away from data driver 10, describes such embodiment below with reference to Figure 13 to Figure 18 is concise and to the point.
Figure 13 is the figure according to the exemplary gamma reference voltage generator of eighth embodiment of the invention.
With reference to Figure 13, except the outside at data driver 10 is provided for receiving respectively positive and negative digital gamma data DV1R-DV9R, DV1G-DV9G, DV1B-DV9B, DV10R-DV18R, DV10G-DV18G, DV10B-DV18B with the positive and negative gamma reference voltage generator 220 and 250 that produces positive and negative gamma reference voltage V1R-V9R, V1G-V9G, V1B-V9B, V10R-V18R, V10G-V18G, V10B-V18B, the eighth embodiment of the present invention is identical with second embodiment.
Positive and negative gamma reference voltage generator 220 and 250 is made up of the digital analog converter of multichannel system respectively, and they are at the ground of each timesharing among R, G and B output positive and negative R, G and B gamma reference voltage V1R-V9R, V1G-V9G, V1B-V9B, V10R-V18R, V10G-V18G, V10B-V18B.Sampling/ holding unit 230 and 260 are provided in data driver 10, and they receive positive and negative R, G, B gamma reference voltage and to its sampling from positive and negative gamma reference voltage generator 220 and 250 respectively.Sampling/holding unit 230 with 260 with first embodiment in identical.
Although the eighth embodiment of the present invention has two digital analog converters of the multichannel system of dividing for each polarity, also can have only a digital analog converter and do not consider polarity, as shown in figure 14.
Figure 14 explanation is according to the exemplary gamma reference voltage generator of ninth embodiment of the invention.
As shown in figure 14, except the outside at data driver 10 is provided for receiving digital gamma data DV1R-DV9R, DV1G-DV9G, DV1B-DV9B, DV10R-DV18R, DV10G-DV18G, DV10B-DV18B with the gamma reference voltage generator 220 that produces gamma reference voltage V1R-V9R, V1G-V9G, V1B-V9B, V10R-V18R, V10G-V18G, V10B-V18B from timing controller, the 9th embodiment is identical with the 3rd embodiment.
Gamma reference voltage generator 220 is made up of digital analog converter, and at each timesharing ground among R, G and the B to sample/hold circuit unit 231-233 and 261-263 output positive and negative R, G, B gamma reference voltage V1R-V9R, V1G-V9G, V1B-V9B, V10R-V18R, V10G-V18G, V10B-V18B.In data driver 10, be provided for receiving respectively positive and negative R, G, B gamma reference voltage and to its sample/hold circuit unit 231-233 and 261-263 that samples.Sample/hold circuit unit 231-233 and 261-263 are identical with second embodiment's.
As shown in figure 15, except positive and negative gamma reference voltage generator 220 and 250 receives the positive and negative gamma reference voltage by timing controller and digital interface respectively, to produce outside the positive and negative gamma reference voltage, the tenth embodiment of the present invention is identical with the 4th embodiment.
Each positive and negative R, G, B gamma reference voltage among positive and negative gamma reference voltage generator 220 and 250 serialization R, G and the B, thus they are offered sampling/ holding unit 230 and 260 in the data driver 10.Sampling/ holding unit 230 and 260 identical with the 4th embodiment.
As shown in figure 16, except gamma reference voltage generator 220 receives digital gamma data to produce the gamma reference voltage by timing controller and digital interface, the 11st embodiment of the present invention is identical with the 5th embodiment.The gamma reference voltage of each among gamma reference voltage generator 220 serialization R, G and the B, thus they are offered sampling/ holding unit 230r, 230g and 230b in the data driver 10.These sampling/ holding units 230r, 230g are identical with 230b with sampling/ holding unit 230r, 230g of the 5th embodiment with 230b.
As shown in figure 17, except positive and negative gamma reference voltage generator 220 and 250 receives the positive and negative gamma reference voltage to produce the positive and negative gamma reference voltage by timing controller and digital interface respectively, the 12nd embodiment of the present invention is identical with the 6th embodiment.Each positive and negative R, G, B gamma reference voltage among positive and negative gamma reference voltage generator 220 and 250 serialization R, G, the B, thus they are offered sampling/ holding unit 230 and 260 in the data driver 10.Sampling/ holding unit 230 and 260 comprises 3 sample/hold circuit unit 231-233 and 261-263 as the 6th embodiment respectively.
As shown in figure 18, except gamma reference voltage generator 220 receives digital gamma data to produce the gamma reference voltage by timing controller and digital interface, the 13rd embodiment of the present invention is identical with the 7th embodiment.The gamma reference voltage of each among gamma reference voltage generator 220 serialization R, G and the B, thus they are offered sampling/holding unit 230 in the data driver 10.This sampling/holding unit 230 comprises 6 samplings as the 7th embodiment/holding unit 231-233 and 261-263.
As mentioned above, have among R, G and the B gamma reference voltage of each, therefore can adjust colour temperature and colour match as required owing to data driver can use the gamma reference voltage of each among R, G and the B.
In addition, can realize the tone that the characteristic by liquid crystal or color filter limits more changefully.
And, even in motion picture, also can obtain active screen, because receive digital gamma data and make new gamma data can put on each frame from timing controller.Certainly, when adopting aforesaid drive IC, timing controller preferably also can change.That is to say, when when timing controller is powered, this timing controller preferably transmits among R, G and the B each gamma value as numeric type to data driver, and it is preferably so that can transmit gamma value by the mode that the on-screen data of analyzing input when active screen is watched in expectation is adjusted gamma value.

Claims (11)

1. LCD comprises:
Timing controller, the digital gamma data of each in output R, G and the B color;
The gamma reference voltage generator will be converted to simulated data from the digital gamma data of this timing controller, to produce gamma reference voltage; And
Data driver comprises: sampling/holding unit, after carrying out sampling and keep processing, exporting the sampling gamma reference voltage from the gamma reference voltage of this gamma reference voltage generator; And digital analog converter, according to the sampling gamma reference voltage view data of each in R, G and the B color is converted to aanalogvoltage and exports them.
2. LCD according to claim 1, wherein said gamma reference voltage generator comprises the first and second polarity gamma reference voltage generators, export in R, G and the B color the first and second polarity gamma reference voltages of each in proper order by a plurality of output terminals
Wherein said sampling/holding unit comprises: the first polarity sampling/holding unit, and first gamma reference voltage is carried out sampling and kept processing, with the sampling gamma reference voltage that has first polarity to digital analog converter output; With the second polarity sampling/holding unit, second gamma reference voltage is carried out sampling and kept processing, with the sampling gamma reference voltage that has second polarity to digital analog converter output.
3. LCD according to claim 1, wherein said gamma reference voltage generator is exported first polarity and the second polarity gamma reference voltage in proper order by a plurality of output terminals,
Wherein said sampling/holding unit comprises: the first polarity sampling/holding unit, to carrying out sampling from the first polarity gamma reference voltage of gamma reference voltage generator and keeping handling, to have R, the G of first polarity and the sampling gamma reference voltage of B color to digital analog converter output; With the second polarity sampling/holding unit, to carrying out sampling from the second polarity gamma reference voltage of gamma reference voltage generator and keeping handling, to have R, the G of second polarity and the sampling gamma reference voltage of B color to digital analog converter output.
4. according to claim 2 or 3 described LCD, wherein each in the first and second sampling/holding units includes each 3 the sample/hold circuit unit that provide in R, G and the B color is provided, and this sample/hold circuit unit comprises a plurality of sample/hold circuits that are connected respectively to a plurality of output terminals of described gamma reference voltage generator
Wherein said sample/hold circuit comprises:
Switch, the ON/OFF of the sampling commencing signal control gamma reference voltage output that response is predetermined;
Capacitor, storage is by the gamma reference voltage of this switch input; And
Impact damper, output is stored in the sampling gamma reference voltage in this capacitor.
5. LCD according to claim 1, wherein said gamma reference voltage comprises: the first polarity gamma reference voltage generator, the first polarity gamma reference voltage of each in serialization R, G and the B color is with by each output R, G in the output terminal and each in the B color; With the second polarity gamma reference voltage generator, the second polarity gamma reference voltage of each in serialization R, G and the B color, with by each output R, G in the output terminal and each in the B color,
Wherein said sampling/holding unit comprises: the first polarity sampling/holding unit, serialization R, G with first polarity and in the B gamma reference voltage each are carried out sampling and kept handling, with each sampling gamma reference voltage in the R from first polarity to digital analog converter output, the G that have and the B color; With the second polarity sampling/holding unit, serialization R, G and each execution in the B gamma reference voltage with second polarity are sampled and the maintenance processing, with each sampling gamma reference voltage in the R from second polarity to digital analog converter output, the G that have and the B color
Wherein each in the first and second polarity sampling/holding units includes 3 sample/hold circuit unit, and each execution sampling and maintenance in R, G and the B gamma reference voltage are handled.
6. LCD according to claim 1, wherein the gamma reference voltage generator is at each the serialization first and second polarity gamma reference voltage in R, G and the B color, with by each output R, G in the output terminal and each in the B color
In wherein said sampling/holding unit each includes R, G and B sampling/holding unit, the serialization gamma reference voltage is carried out sampling and keep handling in R, G and the B color each, to export each in the sampling first and second polarity gamma reference voltages to digital analog converter
Wherein each in R, G and the B sampling/holding unit includes the first polarity sample/hold circuit unit, and the first polarity gamma reference voltage is carried out sampling and maintenance processing in proper order and exported it; With the second polarity sample/hold circuit unit, in the sampling of finishing first polarity with after keeping handling, reception is from the sampling commencing signal of the first polarity sample/hold circuit unit, and the second polarity gamma reference voltage is carried out sampling in proper order and kept handling, and exports them.
7. LCD according to claim 1, wherein said gamma reference voltage generator comprises: the first polarity gamma reference voltage generator, the serialization first polarity R, G and B gamma reference voltage are also exported them; With the second polarity gamma reference voltage generator, the serialization second polarity R, G and B gamma reference voltage are also exported them,
Wherein said sampling/holding unit comprises: the first polarity sampling/holding unit, and the serialization first polarity R, G and B gamma reference voltage are carried out sampling and keep processing, with output sampling R, G and the B first polarity gamma reference voltage; With the second polarity sampling/holding unit, the serialization second polarity R, G and B gamma reference voltage are carried out sampling and keep processing, with output sampling R, G and the B second polarity gamma reference voltage,
Wherein each in the first and second sampling/holding units include with R, G and B color in each corresponding 3 sample/hold circuit unit, and any in these sample/hold circuit unit begins sampling/maintenance by the sampling commencing signal and handles, and finish in any after this sampling/maintenance handles these sample/hold circuit unit described, should sample/holding signal is sent to another sample/hold circuit unit.
8. LCD according to claim 1, wherein said gamma reference voltage generator serialization first and second R, G and B gamma reference voltage are exported them to pass through an output terminal,
Wherein said sampling/holding unit comprises: the first polarity sampling/holding unit, the first polarity R, G and B gamma reference voltage to the serialization first and second polarity gamma reference voltages are carried out sampling in proper order and are kept processing, with the output sampling first polarity R, G and B gamma reference voltage; With the second polarity sampling/holding unit, in the first sampling/holding unit, finish after sampling and the maintenance processing, receive the sampling commencing signal and the second polarity R, G and the B gamma reference voltage of the serialization first and second polarity gamma reference voltages are carried out sampling and maintenance processing in proper order from the first sampling/holding unit, with the output sampling second polarity R, G and B gamma reference voltage
Wherein each in the first and second polarity sampling/holding units include with R, G and B color in each corresponding 3 sample/hold circuit unit, and any in these sample/hold circuit unit begins sampling by the sampling commencing signal and keeps handling, and the commencing signal of should sampling after finishing this sampling and keeping handling is sent to another sample/hold circuit unit.
9. according to each described LCD in the claim 5 to 8, wherein said sample/hold circuit unit comprises a plurality of sample/hold circuits that are parallel to an output terminal of described gamma reference voltage generator,
Wherein said sample/hold circuit comprises:
Shift register transmits the sampling commencing signal to adjacent sample/hold circuit;
Switch responds the ON/OFF that this sampling commencing signal control gamma reference voltage is exported;
Capacitor, storage is by the gamma reference voltage of this switch input; And
Impact damper, output is stored in the sampling gamma reference voltage in this capacitor.
10. according to each described LCD in the claim 5 to 8, wherein said sample/hold circuit unit comprises a plurality of sample/hold circuits that are parallel to an output terminal of described gamma reference voltage generator,
Wherein said sample/hold circuit comprises:
Shift register transmits the sampling commencing signal to adjacent sample/hold circuit;
Switch responds the ON/OFF that this sampling commencing signal is controlled gamma reference voltage;
First and second capacitors, the storage gamma reference voltage;
Input switch is connected to this switch, and the selection signal that responds from external device (ED) transmits the gamma reference voltage that has passed through this switch to first or second capacitor;
Impact damper, output is stored in the gamma reference voltage in first or second capacitor; And
The output switch is connected to first and second capacitors, and transmits the gamma reference voltage that is stored in first or second capacitor to this impact damper.
11. the drive unit of a LCD, output is used to show the data voltage of the image of LCD, and described drive unit comprises:
Sampling/holding unit is carried out sampling and is kept processing the gamma reference voltage that produces in the outside, with output sampling gamma reference voltage; And
Digital analog converter is converted to aanalogvoltage according to the sampling gamma reference voltage with the view data of each in R, G and the B color, and exports them.
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