WO2002043043A1 - Procede et dispositif d'ajustage de gradation d'un ecran a cristaux liquides - Google Patents

Procede et dispositif d'ajustage de gradation d'un ecran a cristaux liquides Download PDF

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Publication number
WO2002043043A1
WO2002043043A1 PCT/JP2001/006946 JP0106946W WO0243043A1 WO 2002043043 A1 WO2002043043 A1 WO 2002043043A1 JP 0106946 W JP0106946 W JP 0106946W WO 0243043 A1 WO0243043 A1 WO 0243043A1
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WO
WIPO (PCT)
Prior art keywords
value
gradation
liquid crystal
luminance
gradation value
Prior art date
Application number
PCT/JP2001/006946
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English (en)
Japanese (ja)
Inventor
Tatumi Naganuma
Original Assignee
Totoku Electric Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Totoku Electric Co., Ltd. filed Critical Totoku Electric Co., Ltd.
Publication of WO2002043043A1 publication Critical patent/WO2002043043A1/fr

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Classifications

    • 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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G02F1/13318—Circuits comprising a photodetector
    • 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
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • 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
    • G09G2320/0606—Manual adjustment
    • 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
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G2320/0693—Calibration of display systems

Definitions

  • the present invention relates to a method and an apparatus for adjusting gradation of a liquid crystal display device.
  • the present invention relates to a method and a device for adjusting a gradation of a liquid crystal display device, and more particularly, to a method of adjusting an original gradation value input from a host device using a liquid crystal display device and a display gradation value for driving a display panel.
  • the present invention relates to a method and an apparatus for adjusting a gradation of a liquid crystal display device for performing an adjustment for an appropriate correspondence.
  • FIG. 10 is a configuration diagram showing an example of a conventional liquid crystal display device.
  • the liquid crystal display device 51 includes a display panel 2, a display panel driving unit 3 for driving the display panel 2, and a display corresponding to a display luminance corresponding to a display signal expressed by a video signal V input from a personal computer P.
  • a gradation conversion table 54 for converting to a gradation value and a backlight for illuminating light from the back of the display panel 2
  • FIG. 11 is an explanatory diagram showing an example of the contents of the gradation conversion table 54.
  • FIG. 12 is a graph showing the luminance characteristics of the liquid crystal display device 51.
  • the luminance changes with a characteristic curve called a gamma characteristic with respect to a display gradation value.
  • a characteristic curve called a gamma characteristic with respect to a display gradation value.
  • the dark part of the image cannot be displayed in gradation.
  • an object of the present invention is to provide an original gradation value input from a higher-level device using a liquid crystal display device and a display floor for driving a display panel so that dark to bright portions of an image can be expressed with appropriate luminance. It is an object of the present invention to provide a method and a device for adjusting the gradation of a liquid crystal display device, which performs adjustment for properly matching the gradation value. Disclosure of the invention
  • the present invention measures the luminance when a maximum display gradation value is input to a liquid crystal display device, and adjusts the backlight of the liquid crystal display device so that the luminance reaches a desired upper limit.
  • the display gradation value is adjusted while measuring the luminance of the liquid crystal display device, and the display gradation value when the luminance reaches the desired lower limit is set as the minimum display gradation value.
  • the range of the maximum and minimum values of the original gradation value input from the host device used is assigned to the range of the maximum display gradation value and the minimum display gradation value, and the original gradation value is displayed based on the assignment.
  • a gradation adjustment method for a liquid crystal display device characterized in that a gradation conversion table for converting to a gradation value is created.
  • the backlight of the liquid crystal display device is adjusted so that the luminance becomes a desired upper limit value when the maximum display gradation value is input.
  • the brightness of the liquid crystal display device is set to a desired lower limit value.
  • a range of the maximum and minimum values of the original gradation value is assigned to the range of the maximum display gradation value and the minimum display gradation value, and a gradation conversion table is created.
  • the brightness of the display panel can be changed between desired upper and lower limits within the range of the original gradation value input from the higher-level device using the liquid crystal display device. In other words, it is possible to express a dark part to a bright part of an image with appropriate luminance.
  • the present invention provides the gradation adjusting method for a liquid crystal display device having the above configuration, wherein an intermediate value between the maximum value and the minimum value of the original gradation value is determined based on a gamma characteristic of the display panel. Corresponding to an intermediate value between the upper limit value and the desired lower limit value, and then adjusting the display gradation value while measuring the luminance of the liquid crystal display device.
  • the tone value is an intermediate display tone value and a tone conversion table is created so as to convert the intermediate value of the original tone value to the intermediate display tone value.
  • the luminance is measured even for an intermediate value between the maximum value and the minimum value of the original gradation value, and an appropriate display is performed in consideration of the gamma characteristic of the display panel. Since it corresponds to the gradation value, it is possible to create a gradation conversion table with high accuracy in the whole range.
  • the present invention provides a luminance measuring means for measuring the luminance of a liquid crystal display device, a display gradation value inputting means for inputting a display gradation value to the liquid crystal display device, and a maximum display gradation value for the liquid crystal display device.
  • a backlight adjusting means for adjusting the backlight of the liquid crystal display device so that the brightness when the value is input becomes a desired upper limit; and adjusting the display gradation value while measuring the brightness of the liquid crystal display device to adjust the brightness.
  • a gradation adjusting device for a liquid crystal display device comprising: a gradation conversion table creating means for creating a gradation conversion table for assigning and converting an original gradation value into a display gradation value.
  • the gradation adjusting method for a liquid crystal display device according to the first aspect can be suitably performed.
  • the gradation conversion table creating means includes a maximum value and a minimum value of an original gradation value based on a gamma characteristic of a display panel. Is associated with an intermediate value between the desired upper limit value and the desired lower limit value of the luminance.
  • the display gradation value is adjusted while measuring the luminance of the liquid crystal display device. The display gradation value when the value becomes the intermediate display gradation value, and a gradation conversion table is created so as to convert the intermediate value of the original gradation value to the intermediate display gradation value.
  • a gradation adjusting device for a liquid crystal display device is provided.
  • the gradation adjusting method for a liquid crystal display device according to the second aspect can be suitably performed.
  • FIG. 1 is a configuration diagram showing a gradation adjusting device of a liquid crystal display device according to one embodiment of the present invention.
  • FIG. 2 is an explanatory diagram showing the contents of a gradation conversion table in FIG.
  • FIG. 3 is a flowchart showing a gradation adjustment process by the gradation adjustment device of FIG.
  • FIG. 4 is another explanatory diagram showing the contents of the gradation conversion table in FIG.
  • FIG. 5 is a graph showing a gamma characteristic of a display panel in the gradation adjusting device of FIG.
  • FIG. 6 is an explanatory diagram of an intermediate value correspondence table.
  • FIG. 7 is yet another explanatory diagram showing the contents of the gradation conversion table in FIG.
  • FIG. 8 is a graph showing the luminance characteristics of the liquid crystal display device after the luminance adjustment.
  • FIG. 9 is still another explanatory diagram showing the contents of the gradation conversion table in FIG.
  • FIG. 10 is a configuration diagram showing an example of a conventional liquid crystal display device.
  • FIG. 11 is an explanatory diagram showing an example of the contents of a gradation conversion table in the liquid crystal display device of FIG.
  • FIG. 12 is a graph showing the luminance characteristics of the liquid crystal display device. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a configuration diagram showing a gradation adjusting device 100 of a liquid crystal display device 1 according to one embodiment of the present invention.
  • This gradation adjusting device 100 is composed of a luminance sensor 10 for detecting the luminance of the display panel 2 of the liquid crystal display device 1 and a personal computer for creating a gradation conversion table 4 for converting the original gradation values into display gradation values.
  • the personal computer 20 has a brightness based on a detection signal from the brightness sensor 10.
  • a display gradation value setting unit 22 for inputting the display gradation value to the display panel drive unit 3 of the liquid crystal display device 1, and setting the desired upper and lower limit values of the luminance. It has an upper / lower limit luminance specifying section 23 for specifying the luminance and a backlight adjusting section 24 for adjusting the light intensity of the backlight 5.
  • Each functional unit is configured by executing the gradation adjustment program on the personal computer 20.
  • FIG. 2 is an explanatory diagram showing the contents of the gradation conversion table 4 in an initial state.
  • a case in which the original gradation value of 256 gradations is converted to the display gradation value of 1024 gradations will be exemplified.
  • FIG. 3 is a flow chart showing a gradation adjustment process by the gradation adjustment device 100 of FIG.
  • step S1 the display gradation value setting unit 22 of the personal computer 20 inputs the maximum display gradation value to the display panel driving unit 3.
  • step S2 the operator inputs a desired upper limit value of luminance by using the upper and lower limit luminance specifying section 23 of the personal computer 20.
  • the desired upper limit is 600 [cd / m 2 ].
  • step S3 the backlight adjusting section 24 of the personal computer 20 measures the luminance of the display panel 2 by the luminance sensor 10 and the luminance measuring section 21 and the luminance reaches the desired upper limit. Thus, the light intensity of the pack light 5 is adjusted.
  • step S4 the operator sets the upper and lower limit Using, enter the desired lower limit of luminance.
  • the desired lower limit is 1.0 [cd / m 2 ].
  • step S5 the display gradation value setting unit 22 of the personal computer 20 adjusts the display gradation value so that the luminance becomes the desired lower limit while measuring the luminance, and the display level at that time is adjusted.
  • the tonal value be the minimum display tone value.
  • the maximum value of the original tone value represented by the video signal input from a higher-level device (for example, a personal computer) using the liquid crystal display device 1 is equal to the desired maximum luminance (600 Ccd / m in the above example). 2 ]), and the minimum value of the original gradation value is assigned to the display gradation value corresponding to the desired minimum luminance (1.0 [cd / m 2 ] in the above example). Will be done.
  • step S7 the personal computer 20 sets the intermediate value a between the maximum value and the minimum value of the original gradation value as the upper limit value of the luminance based on the gamma characteristic of the display panel 2 as shown in FIG. Create an intermediate value correspondence table corresponding to the intermediate value b between the lower limit values.
  • FIG. 6 shows an example of the intermediate value correspondence table 25. Note that the values in FIG. 6 are assigned for convenience of explanation and do not accurately reflect the luminance based on the actual gamma characteristic.
  • step S8 the display gradation value setting unit 22 of the personal computer 20 adjusts the display gradation value while measuring the luminance of the display panel 2, and is registered in the intermediate value correspondence table 25.
  • the display gradation value at the time of the luminance is registered in the display gradation value of the gradation conversion table 4 in association with the original gradation value corresponding to the luminance.
  • the range from the maximum value to the minimum value of the original gradation value is appropriately assigned to the range from the maximum display gradation value to the minimum display gradation value.
  • the created gradation conversion table 4 is created.
  • FIG. 8 is a graph showing luminance characteristics of the liquid crystal display device 1 after luminance adjustment.
  • the luminance of the display panel 2 changes between desired upper and lower limits in the range between the maximum and minimum values of the original tone value input from the higher-level device using the liquid crystal display device 1. That is, dark to bright parts of the image can be represented with appropriate luminance.
  • the gradation adjustment method and apparatus of the liquid crystal display device of the present invention it is possible to easily display a dark part to a bright part of an image with a gradation from a desired upper limit luminance to a desired lower limit luminance.
  • the gradation conversion table is created based on the result of actually measuring the luminance of the liquid crystal display device, it can be appropriately adjusted according to individual differences in the characteristics of the display panel.

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

Abstract

L'invention concerne un ordinateur personnel (20) mesurant au moyen d'un capteur de luminosité (10) la luminosité atteinte lorsqu'un niveau de gradation d'affichage maximal est entré sur un écran à cristaux liquides (1) et réglant le rétroéclairage (5) de cet écran à cristaux liquides (1), de manière que la luminosité correspond à un seuil supérieur souhaité. Pendant la mesure de luminosité de l'écran à cristaux liquides (1), le niveau de gradation d'affichage est ajusté. Le niveau de gradation d'affichage atteint lorsque la luminosité correspond à un seuil inférieur souhaité est converti en un niveau de gradation d'affichage minimal. Les plages de valeurs maximale et minimale du niveau de gradation initial entré depuis un appareil hôte utilisant ledit écran à cristaux liquides (1) sont affectées à la plage de niveaux de gradation d'affichage maximal et minimal et une table de conversion de gradation (4) permettant de convertir le niveau de gradation initial en un niveau de gradation d'affichage est créée. Ainsi, les plages de valeurs maximale et minimale des niveaux initiaux entrées depuis l'appareil hôte peuvent être affichées avec le niveau de gradation entre les seuils de luminosité supérieur et inférieur souhaités, l'image s'étendant de la zone sombre à la zone brillante étant affichée à une luminosité facile à regarder.
PCT/JP2001/006946 2000-11-22 2001-08-10 Procede et dispositif d'ajustage de gradation d'un ecran a cristaux liquides WO2002043043A1 (fr)

Applications Claiming Priority (2)

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JP2000356059A JP2002162937A (ja) 2000-11-22 2000-11-22 液晶表示装置の階調調整方法および装置
JP2000-356059 2000-11-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1650736A1 (fr) * 2004-10-25 2006-04-26 Barco NV Modulation de la luminosité d'un rétro-éclairage pour écran
CN101853625A (zh) * 2010-05-04 2010-10-06 广东中显科技有限公司 一种可自动调节亮度的平面显示系统

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100712334B1 (ko) * 2002-09-30 2007-05-02 엘지전자 주식회사 액정 표시기의 밝기 레벨 조절방법
US7952555B2 (en) 2003-11-19 2011-05-31 Eizo Nanao Corporation Luminance control method, liquid crystal display device and computer program
US20060119592A1 (en) * 2004-12-06 2006-06-08 Jian Wang Electronic device and method of using the same
JP4393433B2 (ja) * 2005-07-29 2010-01-06 株式会社ナナオ 液晶表示装置、輝度測定方法及びコンピュータプログラム
JP4677399B2 (ja) * 2006-12-29 2011-04-27 株式会社ナナオ 液晶表示装置、液晶表示装置の特性量測定装置、特性量測定方法及びコンピュータプログラム
JP5026189B2 (ja) * 2007-08-13 2012-09-12 株式会社ジャパンディスプレイイースト 液晶表示装置
JP5911118B2 (ja) * 2012-04-18 2016-04-27 Ｎｅｃディスプレイソリューションズ株式会社 表示装置、及び表示補正方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0583659A (ja) * 1991-09-24 1993-04-02 Toshiba Corp 電子回路自動調整装置
JPH05173108A (ja) * 1991-11-11 1993-07-13 Nippondenso Co Ltd 表示パネルの調光装置
JPH05257124A (ja) * 1992-03-13 1993-10-08 Hitachi Ltd 液晶ディスプレイ
JPH0756545A (ja) * 1993-08-23 1995-03-03 Matsushita Electric Ind Co Ltd 投写型液晶ディスプレイの階調性補正方法及び階調性補正装置
JPH085511A (ja) * 1994-06-15 1996-01-12 Casio Comput Co Ltd 液晶表示装置評価システム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0583659A (ja) * 1991-09-24 1993-04-02 Toshiba Corp 電子回路自動調整装置
JPH05173108A (ja) * 1991-11-11 1993-07-13 Nippondenso Co Ltd 表示パネルの調光装置
JPH05257124A (ja) * 1992-03-13 1993-10-08 Hitachi Ltd 液晶ディスプレイ
JPH0756545A (ja) * 1993-08-23 1995-03-03 Matsushita Electric Ind Co Ltd 投写型液晶ディスプレイの階調性補正方法及び階調性補正装置
JPH085511A (ja) * 1994-06-15 1996-01-12 Casio Comput Co Ltd 液晶表示装置評価システム

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1650736A1 (fr) * 2004-10-25 2006-04-26 Barco NV Modulation de la luminosité d'un rétro-éclairage pour écran
CN101853625A (zh) * 2010-05-04 2010-10-06 广东中显科技有限公司 一种可自动调节亮度的平面显示系统

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