DE4129846A1 - Liquid crystal display with display voltage control - has photosensor mounted behind continuously operated test field of display for monitoring light action - Google Patents

Liquid crystal display with display voltage control - has photosensor mounted behind continuously operated test field of display for monitoring light action

Info

Publication number
DE4129846A1
DE4129846A1 DE19914129846 DE4129846A DE4129846A1 DE 4129846 A1 DE4129846 A1 DE 4129846A1 DE 19914129846 DE19914129846 DE 19914129846 DE 4129846 A DE4129846 A DE 4129846A DE 4129846 A1 DE4129846 A1 DE 4129846A1
Authority
DE
Germany
Prior art keywords
display
liquid crystal
crystal display
photosensor
test field
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Withdrawn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
DE19914129846
Other languages
German (de)
Inventor
Gerald Helmers
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
Original Assignee
Mannesmann VDO AG
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 Mannesmann VDO AG filed Critical Mannesmann VDO AG
Priority to DE19914129846 priority Critical patent/DE4129846A1/en
Publication of DE4129846A1 publication Critical patent/DE4129846A1/en
Withdrawn legal-status Critical Current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
    • G09G3/36—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
    • 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
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/16—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source
    • G09G3/18—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source using liquid crystals
    • 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
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • 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

Abstract

The liquid crystal display (1) has a sensor (3) for controlling the display voltage to maintain good legibility at different temperatures. The sensor is a photosensor which monitors the light action of the LCD. The photosensor may be a reflection sensor behind the LCD. It is pref. mounted behind a continuously operated test field of the LCD (2). ADVANTAGE - Display voltage is controlled very accurately to enable good visibility of display under all conditions.

Description

Die Erfindung bezieht sich auf eine Flüssigkristallan­ zeige mit einem Sensor zur Steuerung der Displayspannung zum Zwecke der Aufrechterhaltung einer guten Ablesbarkeit der Flüssigkristallanzeige auch bei unterschiedlichen Temperaturen.The invention relates to a liquid crystal show with a sensor to control the display voltage for the purpose of maintaining good legibility the liquid crystal display even with different Temperatures.

Vor allem bei hohen Multiplexraten ist es wichtig, die Displayspannung bei Temperaturschwankungen genau nach­ zuführen. Hierzu ist der Sensor als Temperatursensor aus­ gebildet und möglichst nahe an der Flüssigkristallanzeige angebaut. Die Praxis hat gezeigt, daß es mit einem sol­ chen Sensor umfangreicher Versuche bedarf, um eine halb­ wegs befriedigende Regelung der Displayspannung zu ver­ wirklichen.Especially with high multiplex rates, it is important that Display voltage after temperature fluctuations exactly respectively. For this purpose, the sensor is off as a temperature sensor formed and as close as possible to the liquid crystal display grown. Practice has shown that a sol Chen sensor requires extensive experiments to a half way satisfactory regulation of the display voltage to ver real.

Der Erfindung liegt das Problem zugrunde, eine Flüssig­ kristallanzeige der eingangs genannten Art so auszubil­ den, daß die Displayspannung möglichst genau so geregelt werden kann, daß eine gute Ablesbarkeit der Anzeige unter allen vorkommenden Bedingungen möglich ist.The invention is based on the problem of a liquid crystal display of the type mentioned in this way that the display voltage is regulated as precisely as possible can be that the display is easy to read under all conditions are possible.

Dieses Problem wird erfindungsgemäß dadurch gelöst, daß der Sensor ein die Lichtwirkung der Flüssigkristallan­ zeige überwachender Photosensor ist. This problem is solved according to the invention in that the sensor is the light effect of the liquid crystal show monitoring photosensor is.  

Ein solcher Photosensor mißt genau das, was auch das Auge beim Ablesen der Flüssigkristallanzeige wahrnimmt, näm­ lich das Licht. Deshalb vermag eine Displayspannungsrege­ lung, welche mit einem solchen Sensor arbeitet, optimal dafür zu sorgen, daß die Flüssigkristallanzeige auch bei wechselnden Temperaturen stets gut ablesbar ist.Such a photosensor measures exactly what the eye does perceives when reading the liquid crystal display, näm Lich the light. Therefore, a display voltage rain can tion, which works with such a sensor, optimal to ensure that the liquid crystal display also at changing temperatures is always easy to read.

Besonders einfach ist die Flüssigkristallanzeige aufge­ baut, wenn der Photosensor ein hinter der Flüssigkri­ stallanzeige angeordneter Reflexionssensor ist.The liquid crystal display is particularly simple builds when the photosensor is behind the liquid crystal Stall display arranged reflection sensor is.

Die Ablesbarkeit der Flüssigkristallanzeige kann ständig überwacht und durch Verändern der Displayspannung gere­ gelt werden, wenn der Photosensor hinter einem ständig angesteuerten Testfeld der Flüssigkristallanzeige ange­ ordnet ist.The readability of the liquid crystal display can be constant monitored and changed by changing the display voltage be valid if the photosensor is behind you constantly controlled test field of the liquid crystal display is arranged.

Die Erfindung läßt zahlreiche Ausführungsformen zu. Zur weiteren Verdeutlichung ihres Grundprinzips ist eine da­ von schematisch in der Zeichnung dargestellt und wird nachfolgend beschrieben.The invention allows numerous embodiments. For there is a further clarification of their basic principle of is shown schematically in the drawing and is described below.

Die Zeichnung zeigt eine Flüssigkristallanzeige 1, welche hinter einem ständig angesteuerten Testfeld 2 einen als Reflexionssensor ausgebildeten Photosensor 3 hat. Dieser Photosensor 3 liefert das Eingangssignal für einen Mikro­ prozessor 4, welcher ausgangsseitig zur Steuerung der Displayspannung mit einem Transistor 5 verbunden ist.The drawing shows a liquid crystal display 1 , which has a photosensor 3 designed as a reflection sensor behind a constantly activated test field 2 . This photosensor 3 supplies the input signal for a micro processor 4 , which is connected on the output side to control the display voltage with a transistor 5 .

Claims (3)

1. Flüssigkristallanzeige mit einem Sensor zur Steuerung der Displayspannung zum Zwecke der Aufrechterhaltung einer guten Ablesbarkeit der Flüssigkristallanzeige auch bei unterschiedlichen Temperaturen, dadurch gekennzeich­ net, daß der Sensor ein die Lichtwirkung der Flüssigkri­ stallanzeige (1) überwachender Photosensor (3) ist.1. Liquid crystal display with a sensor for controlling the display voltage for the purpose of maintaining good readability of the liquid crystal display even at different temperatures, characterized in that the sensor is a light effect of the liquid crystal display ( 1 ) monitoring photosensor ( 3 ). 2. Flüssigkristallanzeige nach Anspruch 1, dadurch ge­ kennzeichnet, daß der Photosensor (3) ein hinter der Flüssigkristallanzeige (1) angeordneter Reflexionssensor ist.2. Liquid crystal display according to claim 1, characterized in that the photosensor ( 3 ) is a behind the liquid crystal display ( 1 ) arranged reflection sensor. 3. Flüssigkristallanzeige nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß der Photosensor (3) hinter einem ständig angesteuerten Testfeld (2) der Flüssigkri­ stallanzeige (1) angeordnet ist.3. Liquid crystal display according to claims 1 or 2, characterized in that the photosensor ( 3 ) behind a continuously controlled test field ( 2 ) of the liquid crystal stall display ( 1 ) is arranged.
DE19914129846 1991-09-07 1991-09-07 Liquid crystal display with display voltage control - has photosensor mounted behind continuously operated test field of display for monitoring light action Withdrawn DE4129846A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19914129846 DE4129846A1 (en) 1991-09-07 1991-09-07 Liquid crystal display with display voltage control - has photosensor mounted behind continuously operated test field of display for monitoring light action

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19914129846 DE4129846A1 (en) 1991-09-07 1991-09-07 Liquid crystal display with display voltage control - has photosensor mounted behind continuously operated test field of display for monitoring light action

Publications (1)

Publication Number Publication Date
DE4129846A1 true DE4129846A1 (en) 1993-03-11

Family

ID=6440142

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19914129846 Withdrawn DE4129846A1 (en) 1991-09-07 1991-09-07 Liquid crystal display with display voltage control - has photosensor mounted behind continuously operated test field of display for monitoring light action

Country Status (1)

Country Link
DE (1) DE4129846A1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0878788A2 (en) * 1997-05-15 1998-11-18 Sony Corporation Display state detection for a light emitting information display apparatus
WO2000000917A1 (en) * 1998-06-25 2000-01-06 Elevating Communications, Inc. System for distribution and display of advertisements within elevator cars
DE10023147A1 (en) * 2000-05-12 2001-11-15 Mannesmann Vdo Ag Method for regulating at least one parameter of a liquid crystal cell and liquid crystal cell controllable by such a method
DE10026967A1 (en) * 2000-05-31 2001-12-06 Volkswagen Ag Determination of light intensity in passenger compartment of vehicle, involves arranging sensor such that overall detection area of sensor is increased and external light impinging on the area is detected integrally
WO2002097774A2 (en) * 2001-06-01 2002-12-05 Printable Field Emitters Limited Drive electronics for display devices
DE10138005A1 (en) * 2001-08-02 2003-02-27 Bosch Gmbh Robert Display device esp. for vehicle, uses control device for establishing control variables relative to measured non-control variable
WO2005036508A1 (en) * 2003-10-08 2005-04-21 Siemens Aktiengesellschaft Arrangement comprising a flat screen panel
EP1619540A1 (en) 2003-04-28 2006-01-25 Totoku Electric Co., Ltd. Display device
DE102007018877A1 (en) * 2007-04-19 2008-10-23 Hönig, Thomas Spray nozzle arrangement's application pattern quality measuring method for spray gun, involves executing measurement with sensor arrangement integrated in, on and/or under surface of test field
DE10244792B4 (en) * 2002-09-26 2012-02-02 Robert Bosch Gmbh display device
DE102012014352A1 (en) * 2012-07-20 2014-05-15 Audi Ag Display device of a motor vehicle and method for operating such a display device

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6570559B1 (en) 1997-05-15 2003-05-27 Sony Corporation Information display apparatus, and display state detection method, display state adjustment method and maintenance management method therefor
EP0878788A3 (en) * 1997-05-15 1999-11-24 Sony Corporation Display state detection for a light emitting information display apparatus
EP0878788A2 (en) * 1997-05-15 1998-11-18 Sony Corporation Display state detection for a light emitting information display apparatus
WO2000000917A1 (en) * 1998-06-25 2000-01-06 Elevating Communications, Inc. System for distribution and display of advertisements within elevator cars
US6288688B1 (en) 1998-06-25 2001-09-11 Elevating Communications, Inc. System for distribution and display of advertisements within elevator cars
DE10023147A1 (en) * 2000-05-12 2001-11-15 Mannesmann Vdo Ag Method for regulating at least one parameter of a liquid crystal cell and liquid crystal cell controllable by such a method
DE10026967A1 (en) * 2000-05-31 2001-12-06 Volkswagen Ag Determination of light intensity in passenger compartment of vehicle, involves arranging sensor such that overall detection area of sensor is increased and external light impinging on the area is detected integrally
WO2002097774A2 (en) * 2001-06-01 2002-12-05 Printable Field Emitters Limited Drive electronics for display devices
WO2002097774A3 (en) * 2001-06-01 2003-11-06 Printable Field Emitters Ltd Drive electronics for display devices
DE10138005A1 (en) * 2001-08-02 2003-02-27 Bosch Gmbh Robert Display device esp. for vehicle, uses control device for establishing control variables relative to measured non-control variable
DE10138005B4 (en) * 2001-08-02 2011-03-24 Robert Bosch Gmbh Display device for a particular vehicle, drive means for a display device and method for the control of a display device
DE10244792B4 (en) * 2002-09-26 2012-02-02 Robert Bosch Gmbh display device
EP1619540A1 (en) 2003-04-28 2006-01-25 Totoku Electric Co., Ltd. Display device
WO2005036508A1 (en) * 2003-10-08 2005-04-21 Siemens Aktiengesellschaft Arrangement comprising a flat screen panel
DE102007018877A1 (en) * 2007-04-19 2008-10-23 Hönig, Thomas Spray nozzle arrangement's application pattern quality measuring method for spray gun, involves executing measurement with sensor arrangement integrated in, on and/or under surface of test field
DE102007018877B4 (en) * 2007-04-19 2010-03-04 Hönig, Thomas Method and material application device with a test device for the quality measurement of the application image of a spray nozzle and use of a test field
DE102012014352A1 (en) * 2012-07-20 2014-05-15 Audi Ag Display device of a motor vehicle and method for operating such a display device
US9371036B2 (en) 2012-07-20 2016-06-21 Audi Ag Display device of a motor vehicle and method for operating a display device of this type

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Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
8127 New person/name/address of the applicant

Owner name: MANNESMANN VDO AG, 60326 FRANKFURT, DE

8127 New person/name/address of the applicant

Owner name: SIEMENS AG, 80333 MUENCHEN, DE

8139 Disposal/non-payment of the annual fee