WO2005088590A1 - ガンマ補正回路及びそれを備える表示装置 - Google Patents
ガンマ補正回路及びそれを備える表示装置 Download PDFInfo
- Publication number
- WO2005088590A1 WO2005088590A1 PCT/JP2005/004636 JP2005004636W WO2005088590A1 WO 2005088590 A1 WO2005088590 A1 WO 2005088590A1 JP 2005004636 W JP2005004636 W JP 2005004636W WO 2005088590 A1 WO2005088590 A1 WO 2005088590A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gamma correction
- correction data
- temperature
- correction circuit
- data
- Prior art date
Links
Classifications
-
- 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
-
- 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
- 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
-
- 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
-
- 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
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
-
- 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
Definitions
- the present invention relates to a gamma correction circuit. Further, the present invention relates to a display device such as a liquid crystal display device including the gamma correction circuit.
- a display panel of a display device such as a liquid crystal display device has a non-linear correlation between an applied voltage of a display element and luminance, that is, a gamma characteristic.
- Figure 3 shows general gamma characteristics.
- the solid curve A in FIG. 3 shows the characteristics of the liquid crystal display element (ie, gamma characteristics) when the image voltage (for example, V or V) is directly applied without being corrected (gamma correction).
- the horizontal axis represents the applied voltage
- the vertical axis represents the relative luminance (that is, the light transmittance of the liquid crystal).
- the image voltage for example, V or V
- the image voltage (for example, V or V) is gamma-corrected so that the image voltage and the luminance are along a broken line B having a linear correlation, and the corrected image voltage is adjusted.
- V or V the image voltage
- VI or VI the corrected image voltage
- FIG. 4 shows a liquid crystal display device including a gamma correction circuit similar to that of Patent Document 4.
- This liquid crystal display device 101 has a gun for outputting gamma correction setting voltages VI to VI.
- a display panel driver 3 that outputs the corrected image voltage Vo as an applied voltage to a display panel 4 described below for each source line, a display panel 4, and a nonvolatile memory 5 that stores gamma correction data.
- the gamma correction circuit 102 converts serial gamma correction data input from the outside via the input terminal SD into digital data corresponding to the gamma correction setting voltages VI to VI.
- a gamma correction data output circuit 111 that converts and outputs L-bit (for example, 10-bit) parallel gamma correction data, and m (for example, nine) registers 112 through which the parallel gamma correction data is input and held. 112 and output from registers 112 through 112
- the gamma correction data output circuit 111 stores the gamma correction data in the nonvolatile memory 5 and retrieves the data from the nonvolatile memory 5 as needed.
- the display panel driver 3 equalizes between adjacent voltages (for example, between VI and VI) in the gamma correction setting voltages VI to VI output from the gamma correction circuit 102 by m resistors.
- a resistance ladder 15 that generates an interpolation voltage by interpolating the voltage and a gamma correction setting voltage VI to VI or an image voltage corrected by selecting those interpolation voltages according to the n-bit image data Di.
- the display panel 4 for inputting the corrected image voltage Vo has 2 n gray scales. That is, if n is 8, the gradation of the display panel 4 is 256.
- the value of m is calculated as 2 n / (m-1). That is, if n is 8 and m is 9, m 'is 32.
- the corrected image voltage Vo becomes a voltage equal to VI
- the corrected image voltage Vo becomes the center voltage between VI and VI.
- the display on the display panel 4 is checked in real time, and the gamma correction setting voltages VI to VI are input by inputting serial gamma correction data from an external device to the gamma correction circuit 102 via the input terminal SD. Adjusted to be appropriate. Once the adjustment is complete,
- the gamma correction data in the completed state is stored in the nonvolatile memory 5, and thereafter, the gamma correction data stored in the nonvolatile memory 5 is used.
- Patent Document 1 Japanese Patent Application Laid-Open No. H10-108040
- Patent Document 2 JP-A-11 32237
- Patent Document 3 US Pat. No. 5,796,384
- Patent Document 4 Japanese Patent Application No. 2002-326266 (Japanese Unexamined Patent Application Publication No. 2004-165749);
- the present invention has been made to solve such a problem, and has as its object to provide a display device such as a liquid crystal display device capable of displaying a good image in a wide temperature range. .
- a gamma correction circuit is a gamma correction circuit that outputs a gamma correction setting voltage for correcting an image voltage according to a nonlinear correlation between an applied voltage of a display element and luminance.
- a gamma correction data output circuit that outputs a plurality of gamma correction data in accordance with the detected temperature, a plurality of registers that input and hold a plurality of gamma correction data, and an analog voltage And a plurality of DZA converters that output the gamma correction setting voltage.
- the gamma correction data output circuit of the gamma correction circuit desirably outputs gamma correction data input externally at the time of gamma correction setting voltage adjustment, and after adjusting the gamma correction setting voltage, adjusts the gamma according to the detected temperature.
- the correction data is retrieved from the non-volatile memory and output.
- This gamma correction circuit preferably detects the temperature in synchronization with a cycle of displaying one screen of the display panel.
- a display device includes the above-described gamma correction circuit according to the preferred embodiment of the present invention, and a gamma correction device corresponding to image data input thereto.
- a display panel driver that outputs a corrected image voltage by selecting a constant voltage or an interpolation voltage thereof, a display panel having a display element to which the corrected image voltage from the display panel driver is applied, and a plurality of display panels.
- a temperature sensor that generates an electric signal corresponding to the temperature and outputs the electric signal to the gamma correction circuit.
- the gamma correction circuit includes a gamma correction data output circuit that outputs gamma correction data according to the detected temperature. It becomes possible to do.
- the display device including the gamma correction circuit can display a good image in a wide temperature range.
- FIG. 1 is a circuit diagram of a display device according to a preferred embodiment of the present invention.
- FIG. 2 is a diagram showing a configuration example of a gamma correction data output circuit of the above.
- FIG. 3 is a diagram showing general gamma characteristics.
- FIG. 4 is a circuit diagram of a display device of the background art.
- FIG. 1 shows the present invention.
- FIG. 2 is a circuit diagram of the liquid crystal display device 1 according to the embodiment, if desired.
- the liquid crystal display device 1 includes a gamma correction circuit 2 that outputs gamma correction setting voltages VI to VI for correcting an image voltage according to a nonlinear correlation between an applied voltage of a liquid crystal display element and luminance.
- n-bit (for example, 8-bit) image data Di and input the corresponding gamma correction setting voltages VI to VI or their interpolation voltage to select the image voltage to be corrected.
- a display panel driver 3 that outputs a voltage Vo as an applied voltage to a display panel 4 described below for each source line, a display panel 4 having a liquid crystal display element, a nonvolatile memory 5 for storing gamma correction data, and a temperature. And a temperature sensor 6 that generates an electric signal corresponding to the temperature and outputs the electric signal to the gamma correction circuit 2.
- the display panel driver 3, the display panel 4, and the nonvolatile memory 5 have substantially the same circuit configuration or the same structure as the liquid crystal display device 101 described above.
- the gamma correction circuit 2 converts serial gamma correction data input from the outside via the input terminal SD into digital data corresponding to the gamma correction setting voltages VI to VI.
- Gamma correction data output circuit 11 that converts and outputs parallel gamma correction data of 10 bits (for example, 10 bits), and m (for example, 9) registers 12 through which the parallel gamma correction data is input and held. 12 and the data output from registers 12 to 12
- Buffers 14 to 14 for outputting gamma correction setting voltages VI to VI are Buffers 14 to 14 for outputting gamma correction setting voltages VI to VI.
- FIG. 2 shows a configuration example of the gamma correction data output circuit 11.
- the gamma correction data output circuit 11 includes an interface circuit 21, a control circuit 22, and a temperature detection circuit 23.
- the interface circuit 21 When adjusting the gamma correction setting voltages VI to VI, the interface circuit 21
- serial gamma correction data input from the unit via the input terminal SD is converted to parallel gamma correction data and output to the registers 12 to 12.
- the positive data is sent to the control circuit 22 and stored in the nonvolatile memory 5. Then, the interface circuit 21 adjusts the gamma correction setting voltages VI to VI, and then adjusts the nonvolatile memory.
- the gamma correction data stored in the memory 5 is received from the control circuit 22 and output to the registers 12 to 12.
- the control circuit 22 receives the gamma correction data from the interface circuit 21.
- the gamma correction data stored in the nonvolatile memory 5 is extracted and sent to the interface circuit 21.
- the temperature detection circuit 23 also detects the temperature of a power to be described in detail later, for example, the electric signal power of the temperature sensor 6 configured by a diode-connected transistor, and is controlled by the control circuit 22.
- the display on the display panel 4 is confirmed in real time, and serial gamma correction data is externally input to the gamma correction circuit 2 via the input terminal SD to be adjusted to be appropriate.
- the gamma correction data in the adjustment completed state is stored in the nonvolatile memory 5, and thereafter, the gamma correction data stored in the nonvolatile memory 5 is used.
- the gamma correction data stored in the nonvolatile memory 5 is finely adjusted at predetermined temperatures (for example, at 10 ° C.) in accordance with the temperature characteristics of the liquid crystal display element.
- the temperature at the time of adjustment is only room temperature
- fine adjustment is performed for each predetermined temperature in accordance with the temperature characteristics of the liquid crystal display element experimentally obtained from the gamma correction data. If the temperature at the time of adjustment is the lowest temperature, the normal temperature, and the highest temperature, fine adjustment is performed for each predetermined temperature by interpolating the gamma correction data.
- the storage of the gamma correction data in the nonvolatile memory 5 may be performed not only when the adjustment is completed but also every time new gamma correction data is input from the outside.
- the settings are stored in the non-volatile memory 5.
- control circuit 22 of the gamma correction data output circuit 11 controls the temperature detection circuit 23 in a predetermined cycle to perform temperature detection, and performs temperature detection for each predetermined temperature in accordance with the detected temperature.
- the gamma correction data is extracted from the nonvolatile memory 5 and sent to the interface circuit 21.
- the gamma correction data is output from the interface circuit 21 to the registers 12 to 12, and is converted to analog power by the DZA conversions ⁇ 13 to 13.
- the predetermined cycle of the temperature detection is arbitrary, but preferably, one screen of the display panel 4 is used to update the gamma correction voltages VI to VI every screen or every several screens.
- the cycle is synchronized with the cycle of displaying the screen (for example, about 16 ms).
- the control circuit 22 also includes gamma correction data based on a force reference (for example, at room temperature) that enables high-speed control if the entire gamma correction data corresponding to the temperature is stored in the nonvolatile memory 5 and retrieved. It is also possible to save and retrieve the difference data corresponding to the temperature as gamma correction data corresponding to the temperature, combine them, and output them.
- the liquid crystal display device 1 performs gamma correction according to the detected temperature, and can display a good image in a wide temperature range.
- the temperature detection circuit 23 includes a constant current source 24 on the power supply V side and a power supply V side having a current capability N times that of the constant current source 24.
- the temperature can be detected by performing the subtraction in the control circuit 22 and deriving the resultant temperature detection data temperature (T). Note that the use of the temperature sensor 6 and the temperature detection circuit 23 described herein enables highly accurate temperature detection. However, the temperature detection is not limited to this configuration and can be performed.
- the buffer 1 If the current output capabilities of the DZA converters (DACs) 13 to 13 are sufficient, the buffer 1
- the present invention is not limited to the above-described embodiment, and various design changes can be made within the scope of the claims.
- the liquid crystal display device 1 has been described.
- the gamma correction circuit and the display device of the present invention are not limited thereto, and may be applied to a display device requiring gamma correction (for example, an organic EL display device). Is possible. / vD / O 9 £ 9sa osooifcId 06S880S0SAV ⁇
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Computer Hardware Design (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal Display Device Control (AREA)
- Picture Signal Circuits (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/598,983 US20070262972A1 (en) | 2004-03-17 | 2005-03-16 | Gamma Correction Circuit and Display Device Including Same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004076971A JP4201193B2 (ja) | 2004-03-17 | 2004-03-17 | ガンマ補正回路及びそれを備える表示装置 |
JP2004-076971 | 2004-03-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005088590A1 true WO2005088590A1 (ja) | 2005-09-22 |
Family
ID=34975805
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/004636 WO2005088590A1 (ja) | 2004-03-17 | 2005-03-16 | ガンマ補正回路及びそれを備える表示装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20070262972A1 (ja) |
JP (1) | JP4201193B2 (ja) |
KR (1) | KR20060132942A (ja) |
CN (1) | CN1954353A (ja) |
TW (1) | TW200601226A (ja) |
WO (1) | WO2005088590A1 (ja) |
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CN108986731A (zh) * | 2018-08-07 | 2018-12-11 | 京东方科技集团股份有限公司 | 一种显示面板及其补偿方法、显示装置 |
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KR101154341B1 (ko) * | 2005-08-03 | 2012-06-13 | 삼성전자주식회사 | 표시 장치와, 이의 구동 방법 및 장치 |
US7639222B2 (en) * | 2005-10-04 | 2009-12-29 | Chunghwa Picture Tubes, Ltd. | Flat panel display, image correction circuit and method of the same |
JP4428381B2 (ja) * | 2006-12-19 | 2010-03-10 | ソニー株式会社 | 表示装置及び電子機器 |
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US20080303767A1 (en) * | 2007-06-01 | 2008-12-11 | National Semiconductor Corporation | Video display driver with gamma control |
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US9886885B2 (en) * | 2014-04-18 | 2018-02-06 | Boe Technology Group Co., Ltd. | Gamma correction circuit and display device |
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US10750148B2 (en) * | 2016-12-19 | 2020-08-18 | Iix Inc. | Unevenness correction system, unevenness correction apparatus and panel drive circuit |
JP6552478B2 (ja) * | 2016-12-28 | 2019-07-31 | キヤノン株式会社 | 固体撮像装置 |
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JPH06324646A (ja) * | 1993-05-13 | 1994-11-25 | Toshiba Corp | 表示装置 |
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KR960024524A (ko) * | 1994-12-21 | 1996-07-20 | 김광호 | 기억소자를 이용한 액정 표시장치의 감마 보정장치 |
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-
2004
- 2004-03-17 JP JP2004076971A patent/JP4201193B2/ja not_active Expired - Fee Related
-
2005
- 2005-03-16 US US10/598,983 patent/US20070262972A1/en not_active Abandoned
- 2005-03-16 CN CNA2005800157717A patent/CN1954353A/zh active Pending
- 2005-03-16 KR KR1020067019027A patent/KR20060132942A/ko not_active Application Discontinuation
- 2005-03-16 WO PCT/JP2005/004636 patent/WO2005088590A1/ja active Application Filing
- 2005-03-17 TW TW094108221A patent/TW200601226A/zh unknown
Patent Citations (5)
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JPS63231423A (ja) * | 1987-03-20 | 1988-09-27 | Fujitsu Ltd | 液晶パネルの駆動方式 |
JPH05119733A (ja) * | 1991-10-30 | 1993-05-18 | Nec Home Electron Ltd | 液晶表示装置 |
JPH08211367A (ja) * | 1994-11-11 | 1996-08-20 | Hitachi Ltd | 液晶表示装置 |
JP2002509621A (ja) * | 1996-08-27 | 2002-03-26 | シリコン・イメージ,インコーポレイテッド | アクティブマトリックスディスプレイを制御するための装置及び方法 |
JP2000089192A (ja) * | 1998-09-11 | 2000-03-31 | Matsushita Electric Ind Co Ltd | 液晶表示装置 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105321489A (zh) * | 2012-04-23 | 2016-02-10 | 矽创电子股份有限公司 | 可消除闪烁的显示面板的驱动电路 |
CN105321489B (zh) * | 2012-04-23 | 2019-12-20 | 矽创电子股份有限公司 | 可消除闪烁的显示面板的驱动电路 |
CN108986731A (zh) * | 2018-08-07 | 2018-12-11 | 京东方科技集团股份有限公司 | 一种显示面板及其补偿方法、显示装置 |
Also Published As
Publication number | Publication date |
---|---|
JP4201193B2 (ja) | 2008-12-24 |
US20070262972A1 (en) | 2007-11-15 |
CN1954353A (zh) | 2007-04-25 |
JP2005266154A (ja) | 2005-09-29 |
TW200601226A (en) | 2006-01-01 |
KR20060132942A (ko) | 2006-12-22 |
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