EP2226789A1 - Procédé pour la prévention du collage d'images sur un TFT-LCD - Google Patents

Procédé pour la prévention du collage d'images sur un TFT-LCD Download PDF

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Publication number
EP2226789A1
EP2226789A1 EP09154193A EP09154193A EP2226789A1 EP 2226789 A1 EP2226789 A1 EP 2226789A1 EP 09154193 A EP09154193 A EP 09154193A EP 09154193 A EP09154193 A EP 09154193A EP 2226789 A1 EP2226789 A1 EP 2226789A1
Authority
EP
European Patent Office
Prior art keywords
tft
lcd
image
scanning
sticking
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.)
Withdrawn
Application number
EP09154193A
Other languages
German (de)
English (en)
Inventor
Lin Hang-Lin
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.)
Associated Industries China Inc
Associated Industries China Inc
Original Assignee
Associated Industries China Inc
Associated Industries China Inc
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 Associated Industries China Inc, Associated Industries China Inc filed Critical Associated Industries China Inc
Priority to EP09154193A priority Critical patent/EP2226789A1/fr
Publication of EP2226789A1 publication Critical patent/EP2226789A1/fr
Withdrawn legal-status Critical Current

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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
    • G09G3/3611—Control of matrices with row and column 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • 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
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0464—Positioning

Definitions

  • the present invention relates to a method of preventing image sticking, and particularly to a method of preventing image sticking on Display such as TFT-LCD, PDP, CRT, ...Displays.
  • TFT-LCDs thin-film transistor liquid-crystal display
  • the basic structure of a TFT-LCD panel may be thought of as two glass substrates sandwiching a layer of liquid crystal.
  • the front glass substrate is fitted with a color filter, while the back glass substrate has transistors fabricated on it.
  • the liquid crystal is bent, allowing light to pass through to form a pixel.
  • a light source is located at the back of the panel and belongs to a backlight unit.
  • the front glass substrate is fitted with a color filter, which gives each pixel its own color. The combination of these pixels in different colors forms the image on the panel.
  • the liquid crystal When voltage is applied to a transistor, the liquid crystal is bent and twist, allowing light to pass through to form a pixel; the liquid crystal angles control the amount of light being rotated.
  • the Display when the Display is used as a Surveillance Security system, it is very easy that the "image sticking" generates by Video splitter split line. Moreover, when the Display is used in Air Traffic control center's radar system, the image sticking will generate in fix light points by radar system.
  • the apparatus includes a control unit for outputting a control signal for zooming an input video signal at a predetermined zooming rate and performing the image-sticking prevention function if an image-sticking prevention mode is set, and a video processing unit for zooming the video signal at the predetermined zooming rate and processing the zoomed video signal to display the zoomed video signal on a display screen according to the control signal from the control unit.
  • the video signal is zoomed and then the zoomed video signal is made to move a little bit on the display screen right, left, up, and down.
  • the black display region may be removed from the fringe of display, owing to the operation of zooming, the image in the display screen deforms, which makes the viewer unwell and must be improved.
  • the primary object of the present invention is to provide a method of "preventing image sticking " on a TFT-LCD.
  • the Display control board micro-controller When the Display control board micro-controller to detect whether a timing of input signals is changed; if it does not change within a setting time period, then Display control board micro-controller set controller to start move the Display Data positionor change dark and light of image pixels; These method is to change the voltage between electrodes that liquid crystal in image pixel relatively to change the bent and twist angle of the TFT-LCD panel liquid crystal; these changes will prevent display image sticking.
  • the bent and twist angle of the liquid crystal is changed for activation of the liquid crystal.
  • the method for controlling the movement of the image pixels of the liquid crystals of a TFT-LCD is to make an image frame move to 4 directions; or to make an image line to move by scan line; or to make an image pixels to move by point scanning.
  • an OSD (On Screen Display) setting device is provided for settings of display image-sticking prevention in three modes:
  • the program loops for displacement per 8 hours by default.
  • the image-sticking prevention works in a mode selected on the OSD setting device.
  • mode 1 is selected on the OSD setting device
  • the steps of scanning surface, scanning line, and scanning point work sequentially for the means of protection.
  • mode 2 is selected on the OSD setting device
  • the steps of scanning line and scanning point work sequentially for the means of image-sticking prevention.
  • mode 3 is selected on the OSD setting device, the step of scanning point works sequentially for the means of image-sticking prevention.
  • the present invention relates to a method of preventing image sticking on a TFT-LCD or other type of Display monitor.
  • a display control board 1 has an image scaler 12 and is connected to a TFT-LCD 2 so that signals are communicated there between.
  • the TFT-LCD 2 has a timing controller 21 for receiving LVDS signals from display control board and then converting the signals into RSDS, PPSD, mini-LVDS etc. to drive a source driver and a gate driver, and has a function of gamma calibration.
  • the display control board 1 has a micro-controller 11 for detecting and determining whether a timing of an input signal is changed. If it is unchanged until a setting time, for example 8 hours later, then the image pixels on the TFT-LCD 2 are changed so that the liquid crystals of the TFT-LCD 2 changes.
  • the function, Image Sticking Protect is enabled to protect the TFT-LCD from Image Sticking.
  • the shape of the image pixel will change so as to achieve the object protect the TFT-LCD 2 from generating image sticking.
  • input signals to the display control board 1 may be a D-sub 15 input signal, a DVI input or a video input signals or display signals from a display control board.
  • FIG. 2 the flow diagram about the micro-controller 11 of the display control board 1 according to the present invention is illustrated.
  • a monitoring process is performed.
  • a timing is set.
  • 8 hours of counting time it is set as 0; while disable is set as 1. If disable is 0, then a counting time of 8 hour is actuated. In this process, it will first determine the movement ways of A, B and C and determines whether the input signal timing is changed, or whether the keyboard is changed, or the disable is equal to zero and then the process is over.
  • the image sticking process is actuated, which performs a method selected from the following methods A, B, and C.
  • a surface image sticking preventing way is used.
  • the picture frame of a TFT-LCD moves upwards, downwards, leftwards and rightwards so as to change the data of the frame and activation of liquid crystals so that no image sticking occurs in the liquid crystals.
  • the frame is returned to the center of the frame. Reference of the embodiment in Fig. 6 may also be made.
  • a scan line movement is provided, as illustrated in Fig. 4 .
  • the scan line movement is divided into horizontal scanning and vertical scanning.
  • the scan is performed from upper side to lower side and from left side to right side through at least 2 times.
  • colors and directions of the scanning lines are changeable so as to activate the liquid crystals at different levels.
  • the adjustment is changeable based on the kinds of the liquid crystals (Display Panel Type) so as to have an optimum activation.
  • Reference of the embodiment in Figs. 7 and 8 may be made.
  • the method C is a point scanning method as shown in Fig. 5 .
  • a "scan point" horizontal scanning is performed. When the scan is performed through one line and then the following line scan is performed until all the screen of the TFT-LCD panel is point-scanned to achieve the object of avoiding image sticking.
  • the point scanning for avoiding image sticking is a traceless protection.
  • the color in scanning is adjustable in the method so as to achieve the object of optimum activation. Because the point scanning for avoiding image sticking is difficult to be sensed so that it can be performed for a long time and thus it is an optimum protection way (traceless protection).
  • an OSD (On Screen Display) setting device 13 is provided for settings of display image-sticking prevention in three modes:
  • the program loops for displacement per 8 hours by default.
  • the image-sticking prevention works in a mode selected on the OSD setting device.
  • mode 1 is selected on the OSD setting device
  • the steps of scanning surface, scanning line, and scanning point work sequentially for the means of protection.
  • mode 2 is selected on the OSD setting device
  • the steps of scanning line and scanning point work sequentially for the means of image-sticking prevention.
  • mode 3 is selected on the OSD setting device, the step of scanning point works sequentially for the means of image-sticking prevention.
  • the method of the present invention can achieve the object of avoiding image sticking in the TFT-LCD and therefore the lifetime of the TFT-LCD is prolonged.

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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)
EP09154193A 2009-03-03 2009-03-03 Procédé pour la prévention du collage d'images sur un TFT-LCD Withdrawn EP2226789A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09154193A EP2226789A1 (fr) 2009-03-03 2009-03-03 Procédé pour la prévention du collage d'images sur un TFT-LCD

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09154193A EP2226789A1 (fr) 2009-03-03 2009-03-03 Procédé pour la prévention du collage d'images sur un TFT-LCD

Publications (1)

Publication Number Publication Date
EP2226789A1 true EP2226789A1 (fr) 2010-09-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09154193A Withdrawn EP2226789A1 (fr) 2009-03-03 2009-03-03 Procédé pour la prévention du collage d'images sur un TFT-LCD

Country Status (1)

Country Link
EP (1) EP2226789A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022002205A1 (fr) * 2020-07-01 2022-01-06 华为技术有限公司 Procédé d'affichage et dispositif électronique

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010011979A1 (en) * 1997-06-30 2001-08-09 Kabushiki Kaisha Toshiba Liquid crystal display device
EP1271459A1 (fr) * 2001-06-27 2003-01-02 Deutsche Thomson-Brandt Gmbh Procédé et dispositif pour la compensation des effets de vieillissement sur des panneaux d'affichage
JP2003177715A (ja) * 2001-12-13 2003-06-27 Matsushita Electric Ind Co Ltd 電子機器
US20040239663A1 (en) * 2003-05-29 2004-12-02 Tohoku Pioneer Corporation Dot matrix type display device and information equipment employing the same
US20060001601A1 (en) * 2004-06-25 2006-01-05 Funai Electric Co, Ltd. Plasma display apparatus
EP1696416A2 (fr) * 2005-02-24 2006-08-30 NEC Display Solutions Ltd Dispositif d'affichage et appareil d'affichage grand format l'utilisant
US7411605B2 (en) 2003-12-30 2008-08-12 Lg Electronics Inc. Apparatus for preventing image sticking of video display appliance and method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010011979A1 (en) * 1997-06-30 2001-08-09 Kabushiki Kaisha Toshiba Liquid crystal display device
EP1271459A1 (fr) * 2001-06-27 2003-01-02 Deutsche Thomson-Brandt Gmbh Procédé et dispositif pour la compensation des effets de vieillissement sur des panneaux d'affichage
JP2003177715A (ja) * 2001-12-13 2003-06-27 Matsushita Electric Ind Co Ltd 電子機器
US20040239663A1 (en) * 2003-05-29 2004-12-02 Tohoku Pioneer Corporation Dot matrix type display device and information equipment employing the same
US7411605B2 (en) 2003-12-30 2008-08-12 Lg Electronics Inc. Apparatus for preventing image sticking of video display appliance and method thereof
US20060001601A1 (en) * 2004-06-25 2006-01-05 Funai Electric Co, Ltd. Plasma display apparatus
EP1696416A2 (fr) * 2005-02-24 2006-08-30 NEC Display Solutions Ltd Dispositif d'affichage et appareil d'affichage grand format l'utilisant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022002205A1 (fr) * 2020-07-01 2022-01-06 华为技术有限公司 Procédé d'affichage et dispositif électronique

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