EP1850316A1 - Anzeigevorrichtung mit Funktion zum Ausgleich von Umgebungshelligkeit - Google Patents

Anzeigevorrichtung mit Funktion zum Ausgleich von Umgebungshelligkeit Download PDF

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Publication number
EP1850316A1
EP1850316A1 EP06008572A EP06008572A EP1850316A1 EP 1850316 A1 EP1850316 A1 EP 1850316A1 EP 06008572 A EP06008572 A EP 06008572A EP 06008572 A EP06008572 A EP 06008572A EP 1850316 A1 EP1850316 A1 EP 1850316A1
Authority
EP
European Patent Office
Prior art keywords
luminance
image signal
environment
display device
compensating
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Withdrawn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
EP06008572A
Other languages
English (en)
French (fr)
Inventor
Chin-Peng Tsai
Wen-Wei Tsai
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.)
Asustek Computer Inc
Original Assignee
Asustek Computer 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 Asustek Computer Inc filed Critical Asustek Computer Inc
Priority to EP06008572A priority Critical patent/EP1850316A1/de
Publication of EP1850316A1 publication Critical patent/EP1850316A1/de
Withdrawn legal-status Critical Current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
    • 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
    • G09G2320/06—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
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
    • 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

Definitions

  • the present invention relates to a luminance compensating display device according to the pre-characterizing clauses of claims 1 and 6.
  • a conventional LCD includes an ambient sensor to control the luminance of the backlight module to make the luminance correspond to the luminance of the environment.
  • the above-mentioned adjustment method suffers from two problems.
  • the present invention aims at providing a luminance compensating display device that compensates for luminance of environments to output a clear image.
  • the claimed luminance compensating display device includes a scaler that has an image signal adjuster and a gain controller.
  • RGB red-green-blue
  • Fig.3 is a functional block diagram of an LCD 300 of an embodiment according to the present invention.
  • the LCD 300 includes an ambient sensor 310, a scaler 320, a liquid crystal display screen (LCD screen) 330, and a backlight module 331.
  • the scaler 320 includes a backlight module adjuster 323, a gain controller 324, and a storage device 322 for storing a look-up table 321.
  • the connection of each device is shown in Fig.3.
  • the scaler 320 is connected to the ambient sensor 310, the backlight module adjuster 323 is connected to the backlight module 331, and the gain controller 324 is connected to the LCD screen 330 and the storage device 322.
  • the backlight module adjuster 323 is utilized to adjust the backlight module (known as a light source) to compensate for the environment luminance according to a sensing signal generated from the ambient sensor. Therefore, the backlight module adjuster 323 can also be called a light source adjuster.
  • the operation and function of the LCD 300 will be illustrated in the following disclosure, and is thus omitted here.
  • Fig.4 is a flow chart of an operation of the LCD 300 shown in Fig.3.
  • the flow chart includes the following steps.
  • the ambient sensor 310 detects a variance of the outside luminance (step 400) and outputs a sensing signal according to the luminance of the environment to the scaler 320 (step 410).
  • the backlight adjuster 323 of the scaler 320 adjusts the luminance of the backlight module 331 according to the sensing signal (step 420).
  • the look-up table 321 stores a plurality of gain setting adjustment policies.
  • the gain controller 324 which is inside the scaler 320, selects a proper gain setting adjustment policy according to the adjusted luminance of the backlight module 331 (or according to the sensing signal outputted by the ambient sensor 310) to adjust the RGB color portions of the image.
  • the look-up table 321 can store a plurality of data, where each data corresponds to a relationship between the adjusted luminance of the backlight module 331 and the RGB gain values. This means the gain controller 324 can select a corresponding set of RGB gain values from the look-up table 321 according to the adjusted backlight module 331.
  • the gain controller 324 then utilizes the selected RGB gain values to amplify the original image signal in order to generate an adjusted image signal (step 440).
  • the LCD screen 330 then outputs the image according to the adjusted image signal (step 450).
  • the establishment of the look-up table 321 can be easily accomplished by those skilled in the art.
  • various settings can be obtained through repeated experiments, and these settings can be stored inside the look-up table 321, therein to be used by the scaler 320.
  • Fig.5 illustrates the determination method of the RGB gain values inside the look-up table.
  • the designer can simply determine several levels of the backlight module luminance.
  • the outside luminance can be set as four levels in descending order of brightness, namely:
  • the present invention reacts to outside luminance by adjusting the backlight module.
  • the present invention can compensate the original image signal first, and then change the entire luminance of the LCD screen 330, wherein the compensated signal is adjusted according to data stored inside the look-up table 321. This also enables the LCD screen 330 to display an image having a good luminance and display effect.
  • Fig.6 is a functional block diagram of an LCD of an embodiment according to the present invention.
  • the LCD 600 includes an ambient sensor 610, a scaler 620, and an LCD screen 630.
  • the scaler 620 includes an image signal adjuster 623, a gain controller 624, and a storage device 622 for storing a look-up table 621. The connection of each device is shown in Fig.6.
  • the scaler 620 is electrically connected to the ambient sensor 610.
  • the gain controller 624 is electrically connected to the image signal adjuster 623 and the LCD screen 630.
  • the operation and function of the LCD 600 will be illustrated in the following disclosure.
  • Fig.7 is a flow chart of an operation of an LCD 600 shown in Fig.6. It includes the following steps.
  • the ambient sensor 610 detects a variance of the outside luminance (step 700) and outputs a sensing signal according to the luminance of the environment to the scaler 620 (step 710).
  • the image signal adjuster 623 of the scaler 620 directly compensates the original image. For example, if the outside luminance is stronger, the image signal adjuster 623 can directly add a difference ⁇ to each of the RG B values of the original image signal (step 720) to obtain a compensated image signal (R+ ⁇ ⁇ G+ ⁇ ⁇ B+ ⁇ ).
  • the RGB color portions of the compensated image signal (R+ ⁇ ⁇ G+ ⁇ ⁇ B+ ⁇ ) are different from the original RGB color portions.
  • the gain controller 624 selects a corresponding RGB gain value from the look-up table 621 (step 730) to amplify the compensated image signal (R+ ⁇ ⁇ G+ ⁇ ⁇ B+ ⁇ ) in order to generate an adjusted image signal (step 740).
  • the LCD screen 630 then outputs an image according to the adjusted image signal (step 750).
  • the present invention does not limit the implementations of the ambient sensors 310 and 610.
  • the ambient sensors 310 and 610 can be implemented by light-sensing ICs, light-sensing diodes, light-sensing resistors, or by other light-sensing devices. These modifications also obey the spirit of the present invention.
  • the above-mentioned LCD is only utilized as a preferred embodiment, and not a limitation of the present invention.
  • the present invention can be utilized in all kinds of displays, such as a plasma display or a projector. This also obeys the spirit of the present invention.
  • the above-mentioned adjusted image signal, the original image signal, and compensated signal are all RGB signals.
  • the RGB signals are utilized as an embodiment, not a limitation, and other types of image signals can also be utilized. This also obeys the spirit of the present invention.
EP06008572A 2006-04-25 2006-04-25 Anzeigevorrichtung mit Funktion zum Ausgleich von Umgebungshelligkeit Withdrawn EP1850316A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06008572A EP1850316A1 (de) 2006-04-25 2006-04-25 Anzeigevorrichtung mit Funktion zum Ausgleich von Umgebungshelligkeit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06008572A EP1850316A1 (de) 2006-04-25 2006-04-25 Anzeigevorrichtung mit Funktion zum Ausgleich von Umgebungshelligkeit

Publications (1)

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EP1850316A1 true EP1850316A1 (de) 2007-10-31

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EP06008572A Withdrawn EP1850316A1 (de) 2006-04-25 2006-04-25 Anzeigevorrichtung mit Funktion zum Ausgleich von Umgebungshelligkeit

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EP (1) EP1850316A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105068838A (zh) * 2015-08-07 2015-11-18 联想(北京)有限公司 一种信息处理方法和电子设备

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0683287A (ja) * 1992-09-04 1994-03-25 Sharp Corp 液晶ディスプレイの表示制御装置
EP0883103A1 (de) * 1997-06-05 1998-12-09 THOMSON multimedia Flüssigkristallanzeige für Direktbetrachtung mit automatischer Farbeinstellung
JP2001051652A (ja) * 1999-08-05 2001-02-23 Sanyo Electric Co Ltd 投写型映像表示装置
JP2001134242A (ja) * 1999-11-08 2001-05-18 Nec Corp カラー液晶ディスプレイの駆動方法及びその回路
US20040036703A1 (en) * 2002-08-22 2004-02-26 Hitachi, Ltd. Image displaying method, image displaying device, and contrast adjusting circuit for use therewith
US20040104883A1 (en) * 2002-11-29 2004-06-03 Drader Marc A. Method and apparatus for adjusting the color saturation in a transreflective display
US20050057484A1 (en) * 2003-09-15 2005-03-17 Diefenbaugh Paul S. Automatic image luminance control with backlight adjustment

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0683287A (ja) * 1992-09-04 1994-03-25 Sharp Corp 液晶ディスプレイの表示制御装置
EP0883103A1 (de) * 1997-06-05 1998-12-09 THOMSON multimedia Flüssigkristallanzeige für Direktbetrachtung mit automatischer Farbeinstellung
JP2001051652A (ja) * 1999-08-05 2001-02-23 Sanyo Electric Co Ltd 投写型映像表示装置
JP2001134242A (ja) * 1999-11-08 2001-05-18 Nec Corp カラー液晶ディスプレイの駆動方法及びその回路
US20040036703A1 (en) * 2002-08-22 2004-02-26 Hitachi, Ltd. Image displaying method, image displaying device, and contrast adjusting circuit for use therewith
US20040104883A1 (en) * 2002-11-29 2004-06-03 Drader Marc A. Method and apparatus for adjusting the color saturation in a transreflective display
US20050057484A1 (en) * 2003-09-15 2005-03-17 Diefenbaugh Paul S. Automatic image luminance control with backlight adjustment

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 343 (P - 1761) 28 June 1994 (1994-06-28) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 19 5 June 2001 (2001-06-05) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105068838A (zh) * 2015-08-07 2015-11-18 联想(北京)有限公司 一种信息处理方法和电子设备

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