EP0924683A2 - Dispositif pour éviter la surchauffe d'un panneau d'affichage à plasma - Google Patents

Dispositif pour éviter la surchauffe d'un panneau d'affichage à plasma Download PDF

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Publication number
EP0924683A2
EP0924683A2 EP98123783A EP98123783A EP0924683A2 EP 0924683 A2 EP0924683 A2 EP 0924683A2 EP 98123783 A EP98123783 A EP 98123783A EP 98123783 A EP98123783 A EP 98123783A EP 0924683 A2 EP0924683 A2 EP 0924683A2
Authority
EP
European Patent Office
Prior art keywords
control signal
display
signal
brightness
image signals
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
EP98123783A
Other languages
German (de)
English (en)
Other versions
EP0924683A3 (fr
Inventor
Udo Grundig AG Fischbeck
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.)
Grundig Multimedia BV
Original Assignee
Grundig 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 Grundig AG filed Critical Grundig AG
Publication of EP0924683A2 publication Critical patent/EP0924683A2/fr
Publication of EP0924683A3 publication Critical patent/EP0924683A3/fr
Ceased 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
    • G09G3/22—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 using controlled light sources
    • G09G3/28—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 using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • 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
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G09G2330/045—Protection against panel overheating
    • 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
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the invention relates to a device for avoiding overheating a plasma display, with a measuring unit for generating information on the power consumption of the display, one on the output side with the Measuring unit connected control signal generation unit for generating a Control signal and a circuit acted upon by the control signal for Reduction of the brightness of the image signals shown on the display.
  • Plasma displays are known in which the power consumption of the display measured and a reduction in the brightness of the display shown image signals occurs when the measured power exceeds the predetermined threshold.
  • the advantages of the invention are in particular that the Power consumption of a plasma display is reduced because the in the area of Displays prevailing temperature of the circuit to reduce the Brightness of the image signals shown on the display as additional Component is supplied. This can result in high temperatures maximum permissible current or the duration of the presence of the maximum permissible current strength can be reduced. Consequently, for Power supply to the plasma display smaller and cheaper power supplies be used.
  • the device shown has one Input E, via which a video signal is fed to the device.
  • This video signal is from the video signal path of a television receiver or another source, for example a personal computer derived, which is provided with a plasma display 1, on which Images corresponding to the video signal are displayed.
  • a plasma display 1 on which Images corresponding to the video signal are displayed.
  • Such Plasma displays have a high power consumption due to that Measures are necessary to help the display overheat is avoided.
  • control signal ST1 and / or ST2 generated by means of which the brightness of those shown on the display Image signals is reduced.
  • Control signal generating unit 2 signals from her from a Temperature sensor 3 and an integrator 4 are supplied.
  • Temperature sensor 3 is arranged in the area of the display 1 and for Measurement of the temperature prevailing in the area of the display 1 intended.
  • the integrator 4 is at the output of one in the video signal path arranged controllable amplifier 5 via an A / D converter 6 and digital signal processing circuit 7 connected.
  • the entrance of the controllable amplifier 5 is that applied to input E of the device Signal supplied.
  • the output signal of the digital signal processing circuit 7 becomes continue to be fed to the plasma display via a display driver module 8.
  • the digital signal processing circuit 7 includes one Image storage circuit and an interpolation circuit, by means of which the input signal delivered according to the PAL standard, which 625 Lines per frame, is converted into a 480-line signal, such as it is necessary for display on a plasma display.
  • the control signal ST1 is the control input of the amplifier 5 and that Control signal ST2 applied to the display driver module 8.
  • the temperature sensor 3 becomes Provided signal with predetermined temperature threshold values compared, which are for example at 70 ° C, 80 ° C and 90 ° C. Furthermore, this is also in the control signal generating unit 2 Output signal of the integrator 4 evaluated.
  • the output signal of the integrator 4 is in the Control signal generation unit 2 with a predetermined further Threshold compared.
  • Threshold compared.
  • the control signal generating unit 2 generates a control signal ST1 and / or ST2. Due to this control signal Gain of the amplifier 5 is reduced or the display driver module 8 controlled to the brightness of that shown on the display 1 Reduce video signal.
  • the display driver module 8 is essentially provided by the digital signal provided by the video signal processing circuit 7 Signal into a signal suitable for driving the plasma display 1 convert.
  • the digital image signal is timed in divided several part-time intervals, during which depending on the present brightness value a number of voltage pulses for Display control is generated.
  • Such a procedure is for example in the above-mentioned DE-A-197 20 876.2 of the applicant and the State of the art described there.
  • the above reduction in brightness on the display shown image signals happens in the display driver module 8 in that the number of one in one or more part-time intervals Frame period of the video signal generated digital voltage pulses is reduced.
  • FIG. 2 shows a diagram to illustrate the mode of operation a known device to avoid overheating Plasma displays.
  • the video signal has a black and white transition.
  • the lower representation of FIG. 2 shows the course of the current over time for one pixel, which corresponds to the course of the luminance with respect to this pixel. It it can be seen that the current intensity when the black-white transition occurs starting from a current value I1 to a Current value I2 jumps to the display driver module for display of the white level of the video signal is supplied. This current value I2 is initially available for a period of time ⁇ 1 which is dependent on the type of plasma display.
  • the power consumption is evaluated during this period of the display, which can be based on a current measurement.
  • Time ⁇ 1 is the power consumption of the display over the predetermined threshold.
  • a control signal is generated, based on which the Current is reduced and as a result the brightness of the on the The displayed signal decreases.
  • This reduction in current leads, for example, to a current intensity curve, as shown in the right part of the lower representation in Figure 2 is shown.
  • This reduction in current leads to a reduced power consumption of the display, whereby again overheating of the display and the one near it arranged components is avoided.
  • FIG. 3 shows a diagram to illustrate the mode of action a first embodiment of a device for avoiding a Overheating a plasma display according to the invention.
  • the top Figure 3 is the course of a shown on the display Video signal shown, the video signal a black and white transition having.
  • the lower representation of Figure 2 is for one Pixel the temporal course of the current strength shown, the course of the Luminance corresponds to this pixel.
  • the maximum, for example Current depends on the measured temperature value.
  • FIG. 4 shows a diagram to illustrate the mode of action a second embodiment for a device for avoidance overheating of a plasma display according to the invention.
  • the course is one on the display shown video signal, the video signal having a black and white transition having.
  • the temporal course of the current strength shown is the temporal course of the current strength shown, the course of the luminance corresponds.
  • the measured temperature value used to set the duration as long as the maximum brightness is shown on the display. It is it can be seen that the time period ⁇ 3 for which the current value I2 after the There is a black-and-white transition at a measured temperature of 90 ° C is less than the time period ⁇ 2 for which the current value I2 at one measured temperature of 80 ° C is present. The time period ⁇ 2 is again less than the time period ⁇ 1 for which the current value I2 at a measured temperature of 70 ° C is present.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)
EP98123783A 1997-12-19 1998-12-15 Dispositif pour éviter la surchauffe d'un panneau d'affichage à plasma Ceased EP0924683A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997156653 DE19756653A1 (de) 1997-12-19 1997-12-19 Vorrichtung zur Vermeidung einer Überhitzung eines Plasmadisplays
DE19756653 1997-12-19

Publications (2)

Publication Number Publication Date
EP0924683A2 true EP0924683A2 (fr) 1999-06-23
EP0924683A3 EP0924683A3 (fr) 1999-12-15

Family

ID=7852596

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98123783A Ceased EP0924683A3 (fr) 1997-12-19 1998-12-15 Dispositif pour éviter la surchauffe d'un panneau d'affichage à plasma

Country Status (2)

Country Link
EP (1) EP0924683A3 (fr)
DE (1) DE19756653A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001024150A1 (fr) * 1999-09-30 2001-04-05 Thomson Licensing S.A. Procede de regulation du niveau de puissance et appareil permettant de mettre en pratique le procede
EP1162595A2 (fr) * 1999-10-04 2001-12-12 Matsushita Electric Industrial Co., Ltd. Dispositif d'affichage et sa méthode de commande de luminance
EP1065648A3 (fr) * 1999-06-30 2002-04-17 Fujitsu Limited Panneau d'affichage à plasma
EP1331624A1 (fr) * 2002-01-23 2003-07-30 Koninklijke Philips Electronics N.V. Méthode et dispositif de commande d'un panneau d'affichage à plasma
CN107895565A (zh) * 2017-11-20 2018-04-10 深圳市华星光电技术有限公司 一种液晶显示器及其过温保护方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19925725B4 (de) * 1999-06-07 2005-06-09 Grundig Multimedia B.V. Vorrichtung zur Kühlung eines Displays

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR940002290B1 (ko) * 1991-09-28 1994-03-21 삼성전관 주식회사 평판형 화상 표시장치
JP2856241B2 (ja) * 1993-11-17 1999-02-10 富士通株式会社 プラズマディスプレイ装置の階調制御方法
JPH0865607A (ja) * 1994-08-19 1996-03-08 Fujitsu General Ltd プラズマディスプレイ装置
DE19504923A1 (de) * 1995-02-15 1996-08-29 Mediatec Ges Fuer Multimediale Vorrichtung zum interaktiven Abrufen von Informationen
JPH08251515A (ja) * 1995-03-09 1996-09-27 Fujitsu General Ltd 表示器の焼付防止方法
JPH09297559A (ja) * 1996-05-09 1997-11-18 Fujitsu General Ltd プラズマディスプレイシステム
DE19720876A1 (de) * 1997-05-17 1998-11-19 Grundig Ag Verfahren und Vorrichtung zur Kontrasteinstellung bei impulsbreitengesteuerten Bildanzeigen

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7126562B1 (en) 1999-06-30 2006-10-24 Hitachi, Ltd. Plasma display panel with constant color temperature or color deviation
EP1065648A3 (fr) * 1999-06-30 2002-04-17 Fujitsu Limited Panneau d'affichage à plasma
US7079126B1 (en) 1999-09-30 2006-07-18 Thomson Licensing Method for power level control of a display device and apparatus for carrying out the method
WO2001024150A1 (fr) * 1999-09-30 2001-04-05 Thomson Licensing S.A. Procede de regulation du niveau de puissance et appareil permettant de mettre en pratique le procede
USRE39711E1 (en) 1999-10-04 2007-07-03 Matsushita Electric Industrial Co., Ltd. Display device and luminance control method therefor
EP1162595A2 (fr) * 1999-10-04 2001-12-12 Matsushita Electric Industrial Co., Ltd. Dispositif d'affichage et sa méthode de commande de luminance
EP1136975A4 (fr) * 1999-10-04 2003-02-26 Matsushita Electric Industrial Co Ltd Dispositif d'affichage et procede pour regler sa luminosite
EP1168290A2 (fr) * 1999-10-04 2002-01-02 Matsushita Electric Industrial Co., Ltd. Dispositif d'affichage et sa méthode de commande de luminance
KR100411918B1 (ko) * 1999-10-04 2003-12-18 마츠시타 덴끼 산교 가부시키가이샤 표시 장치 및 그 휘도 제어 방법
USRE39740E1 (en) 1999-10-04 2007-07-24 Matsushita Electric Industrial Co., Ltd. Display device and method of controlling its brightness
USRE39741E1 (en) 1999-10-04 2007-07-24 Matsushita Electric Industrial Co., Ltd. Display device and luminance control method therefor
USRE39742E1 (en) 1999-10-04 2007-07-24 Matsushita Electric Industrial Co., Ltd. Display device and luminance control method therefor
EP1331624A1 (fr) * 2002-01-23 2003-07-30 Koninklijke Philips Electronics N.V. Méthode et dispositif de commande d'un panneau d'affichage à plasma
WO2003063123A1 (fr) * 2002-01-23 2003-07-31 Koninklijke Philips Electronics N.V. Procede et appareil de commande d'ecran a plasma
CN107895565A (zh) * 2017-11-20 2018-04-10 深圳市华星光电技术有限公司 一种液晶显示器及其过温保护方法

Also Published As

Publication number Publication date
DE19756653A1 (de) 1999-06-24
EP0924683A3 (fr) 1999-12-15

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