WO2000004529A1 - Procede pour faire fonctionner un dispositif d'affichage a cristaux liquides, et dispositif d'affichage a cristaux liquides a compensation de temperature - Google Patents

Procede pour faire fonctionner un dispositif d'affichage a cristaux liquides, et dispositif d'affichage a cristaux liquides a compensation de temperature Download PDF

Info

Publication number
WO2000004529A1
WO2000004529A1 PCT/DE1999/002018 DE9902018W WO0004529A1 WO 2000004529 A1 WO2000004529 A1 WO 2000004529A1 DE 9902018 W DE9902018 W DE 9902018W WO 0004529 A1 WO0004529 A1 WO 0004529A1
Authority
WO
WIPO (PCT)
Prior art keywords
display device
cathode tube
cold cathode
energy supply
temperature
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.)
Ceased
Application number
PCT/DE1999/002018
Other languages
German (de)
English (en)
Inventor
Jürgen HABICHER
Martin Michel
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP99945874A priority Critical patent/EP1095368A1/fr
Priority to JP2000560568A priority patent/JP2002520794A/ja
Publication of WO2000004529A1 publication Critical patent/WO2000004529A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • G09G3/3406—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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation

Definitions

  • the invention relates to a method for operating an LCD display device which is backlit by a cold cathode tube, and an LCD display device with a cold cathode tube.
  • the measurement of the ambient temperature or the operating temperature does not have to be carried out directly on the cold cathode tube, but can also be carried out at a more distant location, provided that a relationship between the temperature at the installation location of the cold cathode tube and the measurement location is known. Nevertheless, it is advantageous to carry out the temperature measurement within the display device in order to be able to determine a heating of the cold cathode tube for optional regulation of the energy supply during the self-heating of the cold cathode tube.
  • the measure and / or the period of the increased energy supply for the cold cathode tube can be adapted to the heating behavior of the installation location of the display device for the type of vehicle for which the display device is intended.
  • a specific time period for the increased energy supply can be assigned to a specific ambient temperature of the cold cathode tube.
  • certain periods of time for the increased energy supply can be stored in a non-volatile memory for certain ambient temperatures or temperature ranges.
  • the energy supply is either continuously, stepwise or abruptly reduced to the energy supply in normal operation.
  • a suitable range for increasing the energy supply is between 20% and 70% of the energy supply during normal operation.
  • the invention is particularly suitable for TFT and DSTN color displays used in motor vehicles.
  • the figure shows an LCD display device with a cold cathode tube.
  • An LCD display device 1 with a TFT color display has a microprocessor 11, which is a controller. This controls a cold cathode tube 13 via a controllable current source 12. The current I with which the cold cathode tube 13 is operated is measured by a measuring element 14. A temperature sensor 15 measures the ambient temperature of the cold cathode tube within the housing of the display device 1. The measured values of the measuring element 14 and the temperature sensor 15 are fed to the microprocessor 11.
  • the temperature sensor 15 If the temperature sensor 15 outputs a temperature of less than 0 ° C. to the microprocessor 11, it controls the current source 12 in such a way that the cold cathode tube 13 is supplied with a current I of 9 mA instead of 6.5 mA.
  • the measuring element 14 continuously detects the current intensity with which the cold cathode tube 13 is applied, so that the microprocessor 11 can regulate precisely. If a temperature of 0 ° C is reached, the current increase is limited to approximately 25% above the normal operating current, i.e. approximately 7.8 mA. If the temperature sensor 15 measures an ambient temperature of approximately 20 ° C., the cold cathode tube 13 is operated with the normal operating current of approximately 6.5 mA.
  • the microprocessor 11 sets the nominal current for normal operation of the cold cathode tube 13 after 20 minutes, regardless of the operating temperature of the cold cathode tube that has been reached by then.

Landscapes

  • Engineering & Computer Science (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)
  • Liquid Crystal Display Device Control (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

Selon l'invention, en vue de compenser à basse température le bas rendement d'éclairage d'un tube à cathode froide (3), la température ambiante du tube à cathode froide, dans un dispositif d'affichage à cristaux liquides est mesurée. Si cette température est en-dessous d'une valeur limite, l'alimentation en énergie du tube à cathode froide est augmentée par rapport à l'alimentation se faisant en fonctionnement normal.
PCT/DE1999/002018 1998-07-15 1999-07-01 Procede pour faire fonctionner un dispositif d'affichage a cristaux liquides, et dispositif d'affichage a cristaux liquides a compensation de temperature Ceased WO2000004529A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99945874A EP1095368A1 (fr) 1998-07-15 1999-07-01 Procede pour faire fonctionner un dispositif d'affichage a cristaux liquides, et dispositif d'affichage a cristaux liquides a compensation de temperature
JP2000560568A JP2002520794A (ja) 1998-07-15 1999-07-01 Ｌｃｄ表示装置の駆動方法およびｌｃｄ表示装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998131822 DE19831822C2 (de) 1998-07-15 1998-07-15 Verfahren zum Betrieb einer LCD-Anzeigevorrichtung und LCD-Anzeigevorrichtung
DE19831822.7 1998-07-15

Publications (1)

Publication Number Publication Date
WO2000004529A1 true WO2000004529A1 (fr) 2000-01-27

Family

ID=7874163

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/002018 Ceased WO2000004529A1 (fr) 1998-07-15 1999-07-01 Procede pour faire fonctionner un dispositif d'affichage a cristaux liquides, et dispositif d'affichage a cristaux liquides a compensation de temperature

Country Status (4)

Country Link
EP (1) EP1095368A1 (fr)
JP (1) JP2002520794A (fr)
DE (1) DE19831822C2 (fr)
WO (1) WO2000004529A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3759133B2 (ja) * 2003-08-29 2006-03-22 ローム株式会社 電源装置
JP2008122695A (ja) * 2006-11-13 2008-05-29 Sharp Corp 液晶表示装置及びその制御方法
DE102008017505B4 (de) * 2008-04-04 2010-09-09 Andreas Franz Karl Weyer Leuchte mit Kaltkathodenlampe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994009475A1 (fr) * 1992-10-20 1994-04-28 Panocorp Display Systems Dispositif d'affichage et son procede de commande
EP0642113A1 (fr) * 1993-09-07 1995-03-08 Koninklijke Philips Electronics N.V. Dispositif d'affichage avec compensation de la température
EP0731438A2 (fr) * 1995-02-27 1996-09-11 Canon Kabushiki Kaisha Dispositif d'affichage
US5774105A (en) * 1994-10-07 1998-06-30 Canon Kabushiki Kaisha Display apparatus with memory characteristic for storing system data

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4326415B4 (de) * 1993-08-06 2006-04-13 Siemens Ag Verfahren zur Ansteuerung einer Leuchtstofflampe und Anordnung zur Durchführung des Verfahrens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994009475A1 (fr) * 1992-10-20 1994-04-28 Panocorp Display Systems Dispositif d'affichage et son procede de commande
EP0642113A1 (fr) * 1993-09-07 1995-03-08 Koninklijke Philips Electronics N.V. Dispositif d'affichage avec compensation de la température
US5774105A (en) * 1994-10-07 1998-06-30 Canon Kabushiki Kaisha Display apparatus with memory characteristic for storing system data
EP0731438A2 (fr) * 1995-02-27 1996-09-11 Canon Kabushiki Kaisha Dispositif d'affichage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"COMPENSATION OF LIQUID CRYSTAL DISPLAY CONTRAST AND BRIGHTNESS FOR TEMPERATURE VARIATION", IBM TECHNICAL DISCLOSURE BULLETIN,US,IBM CORP. NEW YORK, vol. 36, no. 10, 10 October 1993 (1993-10-10), pages 381-382, XP000412299, ISSN: 0018-8689 *

Also Published As

Publication number Publication date
DE19831822C2 (de) 2000-05-25
DE19831822A1 (de) 2000-01-20
EP1095368A1 (fr) 2001-05-02
JP2002520794A (ja) 2002-07-09

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