EP1538595A1 - Circuit de commande pour un dispositif d'affichage à cristaux liquides et son procédé de commande - Google Patents

Circuit de commande pour un dispositif d'affichage à cristaux liquides et son procédé de commande Download PDF

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Publication number
EP1538595A1
EP1538595A1 EP03027582A EP03027582A EP1538595A1 EP 1538595 A1 EP1538595 A1 EP 1538595A1 EP 03027582 A EP03027582 A EP 03027582A EP 03027582 A EP03027582 A EP 03027582A EP 1538595 A1 EP1538595 A1 EP 1538595A1
Authority
EP
European Patent Office
Prior art keywords
image data
gray scale
data
driving method
lcd
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP03027582A
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German (de)
English (en)
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EP1538595B1 (fr
Inventor
Cheng-Jung Chen
Yuhren Shen
Liang-Chen Chien
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VastView Technology Inc
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VastView Technology Inc
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Publication date
Application filed by VastView Technology Inc filed Critical VastView Technology Inc
Priority to EP03027582A priority Critical patent/EP1538595B1/fr
Priority to DE60332356T priority patent/DE60332356D1/de
Publication of EP1538595A1 publication Critical patent/EP1538595A1/fr
Application granted granted Critical
Publication of EP1538595B1 publication Critical patent/EP1538595B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0252—Improving the response speed
    • 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
    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame

Definitions

  • the invention relates to a driving circuit of a liquid crystal display and its relating driving method according to the pre-characterizing clause of claim 1.
  • a liquid crystal display has advantages of light weight, low power consumption, and low divergence and is applied to various portable equipment such as notebook computers and personal digital assistants (PDAs).
  • LCD monitors and LCD televisions are gaining in popularity as a substitute for traditional cathode ray tube (CRT) monitors and televisions.
  • CRT cathode ray tube
  • an LCD does have some disadvantages. Because of the limitations of physical characteristics, the liquid crystal molecules need to be twisted and rearranged when changing input data, which can cause the images to be delayed. For satisfying the rapid switching requirements of multimedia equipment, improving the response speed of liquid crystal is desired.
  • the present invention aims at providing a driving circuit with an adjustable gamma and an LUT of an LCD along with the relating driving method to solve the problem mentioned above.
  • the present invention provides a driving method of an LCD.
  • the LCD includes an LCD panel; the LCD panel includes a plurality of scan lines, a plurality of data lines, and a plurality of pixels. Each pixel is connected to a corresponding scan line and a corresponding data line, and each pixel comprises a switching device connected to the corresponding scan line and the corresponding data line.
  • the method includes (a) measuring reaction curves of a pixel of the LCD panel switched from any gray scale value to other gray scale values within a frame period and generating a standard table according to the reaction curves measured, (b) measuring adjustment gray scale values of any gray scale value for different gammas, (c) generating a plurality of tables according to the adjustment gray scale values and the standard table, (d) applying scan voltages to the scan lines, (e) receiving image data from an image signal terminal, (f) delaying the image data for a frame period in order to generate delayed image data, (g) selecting a table from the standard table and the tables according to the gamma, and (h) selecting an image data value from the selected table according to the current image data and the delayed image data and generating a data line voltage according to the image data value, applying the generated data line voltage on a corresponding data line.
  • the prior art is disclosed in U.S. published application No. 2002/0050965.
  • the U.S. published application No. 2002/0050965 discloses an over-driving method using a brief table to store the over-driving image data.
  • the brief table only includes part of the over-driving image data for driving the pixels switched from one gray scale to another.
  • a processor is used to perform an interpolation operation to expand the brief table.
  • an extra algorithm is needed in the conventional over-driving method.
  • the effect of using an extra algorithm is that it will slow down the response speed.
  • Fig.1 is a timing diagram of the pixel voltage and the transmission rate V1 according to a prior art LCD.
  • the pixel voltage is shown with the straight lines, and the transmission rate V1 is shown with a dotted line.
  • frame N means a frame period, and frame N+1, N+2... mean the following frame periods. Due to the physical characteristics of liquid crystal molecules, when the pixel voltage is switched from a data voltage C1 to a data voltage C2, , the liquid crystal molecules cannot be twisted to a predetermined angle within a single frame period, resulting in failure to perform at a predetermined transmission rate. As the curve of the transmission rate V1 shows, the transmission rate V1 cannot reach a predetermined transmission rate until the frame period of frame N+2. The delayed response-time will cause blurring on the LCD.
  • Fig.2 is a timing diagram of the pixel voltage and the transmission rate V2 according to a prior art LCD using an over-driving method.
  • an over-driving data voltage C3 is added to accelerate the response speed of the liquid crystal molecules. Since a higher data voltage can obtain a faster response speed of the liquid crystal molecules, a data voltage C3 that is higher than the data voltage C2 can improve the response-time enough to reach the predetermined transmission rate in a single frame period.
  • the curve of the transmission rate V2 reaches the predetermined transmission rate in frame N.
  • Fig.3 is a circuit diagram of a typical LCD 30.
  • the LCD 30 comprises an LCD panel 31, and the LCD panel 31 includes a plurality of scan lines 32, a plurality of data lines 34, and a plurality of pixels 36.
  • Each pixel 36 is connected to a corresponding scan line 32 and a corresponding data line 34, and each pixel 36 has a switching device 38 and a pixel electrode 39.
  • the switching device 38 is connected to the corresponding scan line 32 and the corresponding data line 34.
  • scan voltages are applied to the scan lines 32 to turn on the switching devices 38, and data voltages are applied to the data lines 34 and transmitted to the pixel electrodes 30 through the switching devices 38.
  • the data voltages on the data lines 34 will charge the pixel electrodes 39 through the switch devices 38 thereby, twisting the liquid crystal molecules.
  • the scan voltages on the scan lines 32 are removed to turn off the switching devices 38, the data lines 34 and the pixels 36 will disconnect, and the pixel electrodes 39 will remain charged.
  • the scan lines 32 turn the switching devices 38 on and off repeatedly so that the pixel electrodes 39 can be repeatedly charged. Different data voltages cause different twisting angles and show different transmission rates. Hence, the LCD 30 displays various images.
  • the driving circuit 40 is for driving the LCD 30 in Fig.3.
  • the driving circuit 40 includes an image signal terminal 42, a memory controller 44, an image memory 46, an LUT 48, a memory 50, a table selector 54, a data line driving circuit 56, and a thermal sensor 58.
  • the image signal terminal 42 respectively transmits 8-bit image data of red, greed and blue (RGB) to the memory controller 44 and the LUT 48.
  • RGB red, greed and blue
  • Each group of image data is for controlling the gray scale value of the pixel 30 in red, green or blue.
  • Each color has 256 (2 8 ) gray scales, so that 24 (8*3) bits of image data are required to determine the properties of each pixel 30.
  • one (image data D8) of the 3 groups of image data is used for a further description.
  • the image signal terminal 42 transmits the 8-bit image data D8 to the memory controller 44 and the LUT 48.
  • the memory controller 44 transmits the image data D8 to the image memory 46 to store, delays the image data D8 for a frame period, and then reads the image data D8 out from the image memory 46 and transmits them to the LUT 48.
  • the image data D8 delayed for a frame period is hereby defined as delayed image data D8'. Therefore, the delayed image data D8' and the image data D8 belong to two different frames, and these two image data D8' and D8 are input from the image signal terminal 42 in sequence at an interval of a frame period.
  • the memory 50 stores a plurality of parameter tables 52. Each table 52 corresponds to different gammas.
  • the driving circuit 40 can select the proper table 52 to use as the LUT 48 to drive the LCD panel 31 according to the gamma. For this reason, a table selector 54 is used to select a table 60 from the plurality of tables 52 according to the gamma and send it to the LUT 48.
  • Fig.5 showing a table 60 used by the LUT 48 in Fig.4.
  • the table 60 stores (2 8 x 2 8 ) pieces of 8-bit overdrive image data 62. Each piece of image data 62 corresponds to different combinations of the current image data D8 and the delayed image data D8'.
  • the LUT 48 selects an image data value 62 from the table 60, selected by the table selector 54, according to the current image data D8 and the delayed image data D8' and then sends it to the data line driving circuit 56. Continuously, the data line driving circuit 56 generates a data line voltage according to the image data value 62 output from the LUT 48 and applies it to a corresponding data line 34.
  • the LUT 48 selects the image data value 62 with a value of 210 from the table 60 according to the current image data D8 and the delayed image data D8'.
  • the data line driving circuit 56 generates a data line voltage corresponding to the image data value 62 with a value of 210 and applies it to the corresponding data line 34.
  • the selected image data value 62 is larger than the value of the current image data D8 (i.e. 210>180), which means the driving circuit 40 overdrives the pixel 36.
  • the image data values in the tables 52 according to the present invention are previously stored in the memory 50. Therefore, the driving circuit 40 according to the present invention does not require the processor for extraction as in the prior art.
  • the image data values in the tables 52 are obtained by measuring the LCD panel 31 so that the driving circuit 40 can overdrive the LCD panel 31 correctly without an operation such as interpolation as in the prior art. Please refer to Fig.6 showing the measurement of reaction curves of the LCD panel 31. Before determining the overdrive image data in the table 52, reaction curves representing a pixel 36 switching from any gray scale value to other gray scale values in a frame period t can be measured.
  • Fig.6 shows the reaction curves C0 ⁇ C255 representing the pixel 36 switching from a gray scale value 128 to any other gray scale values (0 ⁇ 255).
  • the reaction curve diagrams like Fig. 6 shown respectively for the pixel 36 switching from one gray scale value (0 ⁇ 225) to other gray scale values within a frame period t.
  • Fig.7 showing the method used to determine overdrive image data in the table 52.
  • the gray scale is not able to reach 180 in a frame period t.
  • an overdrive voltage is required to be applied to the pixel electrode 39 of the pixel 36. Therefore, the data voltage required to have the pixel electrode 39 of the pixel 36 switch from the gray scale value 128 to 180 in a frame period can be known by using the reaction curves C0 ⁇ C225 in Fig.6.
  • the method to determine overdrive image data is as follows:
  • each table 50 stores (2 8 x 2 8 ) 8-bit overdrive image data, and each piece of the image data is obtained by measuring the LCD panel 31.
  • the overdrive data value will be 0 or 255, wherein 0 is for a high gray scale value to a low gray scale value, and 255 is for a low gray scale value to a high gray scale value.
  • the table 60 in Fig.5 obtained by measurement is defined as a standard table.
  • the overdrive image data 62 in the column along a diagonal line 64 from the upper-left to the lower-right equals to the corresponding delayed image data D8' and the corresponding image data D8. That means the gamma of the table 60 has not been adjusted, i.e. the gamma corresponding to the table 60 is 1.
  • Fig.8 shows a table 70 whose gamma has been adjusted. Being the same as the standard table 60, the table 70 is selected from the plurality of tables 52 in the memory 50, and it stores a plurality of overdrive image data 72 for the LUT 48.
  • the gamma is adjusted so that all the overdrive image data 72 in the columns along the diagonal line 74 do not necessarily equal to the corresponding delayed image data D8' and the corresponding image data D8.
  • the overdrive image data 72 in the table 70 is relative to the overdrive image data 62 in the table 60 because the overdrive image data 72 is obtained through the following steps:
  • tables 50 corresponding to other gammas can be generated according to the method mentioned above. Measure overdrive image data in columns along a diagonal line of each table 50, and then solve other overdrive image data according to the standard table 60 and the overdrive data in the columns along the diagonal line.
  • the driving circuit 40 selects the table according to the temperature of the LCD panel 31 by generates temperature compensation signals St sending them to the table selector 54 so that the table selector 54 selects a table from the plurality of tables 52 stored in the memory 50, according to both gamma and the temperature compensation signals St, and transmits the selected table to the LUT 48.
  • the tables according to the present invention are built by actually measuring the over-driving voltages needed for properly driving the liquid crystal panel within a frame period.
  • the tables include all the over-driving image data that drives the pixels from any gray scale to another so that the processor used to extract the brief table is no longer required.
  • the driving circuit and the driving method of the present invention is capable of selecting different tables according to gamma and temperature of the LCD panel for the LUT.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP03027582A 2003-12-01 2003-12-01 Circuit de commande pour un dispositif d'affichage à cristaux liquides et son procédé de commande Expired - Lifetime EP1538595B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP03027582A EP1538595B1 (fr) 2003-12-01 2003-12-01 Circuit de commande pour un dispositif d'affichage à cristaux liquides et son procédé de commande
DE60332356T DE60332356D1 (de) 2003-12-01 2003-12-01 Ansteuerschaltkreis für eine Flüssigkristallanzeige und Ansteuerverfahren dafür

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03027582A EP1538595B1 (fr) 2003-12-01 2003-12-01 Circuit de commande pour un dispositif d'affichage à cristaux liquides et son procédé de commande

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EP1538595A1 true EP1538595A1 (fr) 2005-06-08
EP1538595B1 EP1538595B1 (fr) 2010-04-28

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7642999B2 (en) 2005-07-27 2010-01-05 Mitsubishi Electric Corporation Image processing circuit
CN101101735B (zh) * 2006-07-07 2011-07-27 奇美电子股份有限公司 液晶显示装置及其过度驱动方法
CN101364386B (zh) * 2007-08-07 2013-06-12 奇美电子股份有限公司 选择性过驱动方法及其装置
CN107093396A (zh) * 2017-05-19 2017-08-25 友达光电股份有限公司 显示设备及其驱动方法
CN115394263A (zh) * 2022-08-26 2022-11-25 苏州华星光电技术有限公司 显示面板的驱动方法及驱动装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101996565A (zh) * 2010-12-10 2011-03-30 华映视讯（吴江）有限公司 显示驱动系统及方法
KR102694705B1 (ko) * 2016-01-21 2024-08-13 주식회사 엘엑스세미콘 디스플레이 장치의 소스 드라이버

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999005567A1 (fr) * 1997-07-22 1999-02-04 Koninklijke Philips Electronics N.V. Dispositif afficheur
US6100879A (en) * 1996-08-27 2000-08-08 Silicon Image, Inc. System and method for controlling an active matrix display
US20020063666A1 (en) * 2000-06-28 2002-05-30 Kang Sin Ho Apparatus and method for correcting gamma voltage and video data in liquid crystal display
US20030095090A1 (en) * 2001-09-12 2003-05-22 Lg. Phillips Lcd Co., Ltd. Method and apparatus for driving liquid crystal display
US20030098839A1 (en) * 2001-11-26 2003-05-29 Lee Baek-Woon Liquid crystal display and a driving method thereof
US6611249B1 (en) * 1998-07-22 2003-08-26 Silicon Graphics, Inc. System and method for providing a wide aspect ratio flat panel display monitor independent white-balance adjustment and gamma correction capabilities

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
US5910796A (en) * 1996-05-20 1999-06-08 Ricoh Corporation Monitor gamma determination and correction
JP3678000B2 (ja) * 1998-05-27 2005-08-03 富士通株式会社 表示装置の調整方法及び表示装置の調整装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6100879A (en) * 1996-08-27 2000-08-08 Silicon Image, Inc. System and method for controlling an active matrix display
WO1999005567A1 (fr) * 1997-07-22 1999-02-04 Koninklijke Philips Electronics N.V. Dispositif afficheur
US6611249B1 (en) * 1998-07-22 2003-08-26 Silicon Graphics, Inc. System and method for providing a wide aspect ratio flat panel display monitor independent white-balance adjustment and gamma correction capabilities
US20020063666A1 (en) * 2000-06-28 2002-05-30 Kang Sin Ho Apparatus and method for correcting gamma voltage and video data in liquid crystal display
US20030095090A1 (en) * 2001-09-12 2003-05-22 Lg. Phillips Lcd Co., Ltd. Method and apparatus for driving liquid crystal display
US20030098839A1 (en) * 2001-11-26 2003-05-29 Lee Baek-Woon Liquid crystal display and a driving method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7642999B2 (en) 2005-07-27 2010-01-05 Mitsubishi Electric Corporation Image processing circuit
CN101101735B (zh) * 2006-07-07 2011-07-27 奇美电子股份有限公司 液晶显示装置及其过度驱动方法
CN101364386B (zh) * 2007-08-07 2013-06-12 奇美电子股份有限公司 选择性过驱动方法及其装置
CN107093396A (zh) * 2017-05-19 2017-08-25 友达光电股份有限公司 显示设备及其驱动方法
CN115394263A (zh) * 2022-08-26 2022-11-25 苏州华星光电技术有限公司 显示面板的驱动方法及驱动装置
CN115394263B (zh) * 2022-08-26 2023-08-22 苏州华星光电技术有限公司 显示面板的驱动方法及驱动装置

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Publication number Publication date
EP1538595B1 (fr) 2010-04-28
DE60332356D1 (de) 2010-06-10

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