EP1484738A3 - Method and apparatus for improving the display of grey levels in a pulse width modulated display device - Google Patents

Method and apparatus for improving the display of grey levels in a pulse width modulated display device Download PDF

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Publication number
EP1484738A3
EP1484738A3 EP04010513A EP04010513A EP1484738A3 EP 1484738 A3 EP1484738 A3 EP 1484738A3 EP 04010513 A EP04010513 A EP 04010513A EP 04010513 A EP04010513 A EP 04010513A EP 1484738 A3 EP1484738 A3 EP 1484738A3
Authority
EP
European Patent Office
Prior art keywords
image
representation
improving
pulse width
display device
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
EP04010513A
Other languages
German (de)
French (fr)
Other versions
EP1484738A2 (en
Inventor
Markus c/o Grundig Multimedia B.V. Friebe
Udo 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 Multimedia BV
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 Multimedia BV filed Critical Grundig Multimedia BV
Publication of EP1484738A2 publication Critical patent/EP1484738A2/en
Publication of EP1484738A3 publication Critical patent/EP1484738A3/en
Ceased 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
    • G09G3/22—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
    • G09G3/2803—Display of gradations
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • 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
    • 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
    • G09G3/288—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 using AC panels
    • G09G3/291—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 using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/294—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 using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
    • G09G3/2944—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 using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge by varying the frequency of sustain pulses or the number of sustain pulses proportionally in each subfield of the whole frame

Abstract

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Verbesserung der Grauwertdarstellung bei einer pulsbreitengesteuerten Bildanzeigevorrichtung Dabei wird das für eine Bilddarstellung zur Verfügung stehende Zeitintervall in aufeinanderfolgende gewichtete Teilzeitintervalle aufgeteilt, wobei die Teilzeitintervalle Aktivierungssequenzen beinhalten, die wiederum aus jeweils vorgegebenen Anzahlen von Sustain-Pulsen bestehen Wird durch Analyse eines darzustellenden Bildes erkannt, dass ein dunkles Bild ohne größere helle Bildanteile vorliegt, wird in Abhangigkeit von den ermittelten Bildhelligkeitsverhältnissen ein Signal erzeugt, das die Anzahl der Sustain-Pulse für alle Aktivierungssequenzen die innerhalb eines Zeitintervalls für die Darstellung des Bildes liegen, um einen den ermittelten Bildhelligkeitsverhältnissen zugeordneten Prozentsatz verringert. Dadurch wird eine Verbesserung der Grauwertdarstellung beim Vorliegen dunkler Bilder erreicht.

Figure imgaf001
The invention relates to a method and a device for improving the gray value representation in a pulse width-controlled image display device. The time interval available for an image representation is divided into successive weighted part-time intervals, wherein the part-time intervals include activation sequences, which in turn consist of respectively predetermined numbers of sustain pulses detected by analyzing an image to be displayed that a dark image is present without larger light image portions, a signal is generated, which is the number of sustain pulses for all activation sequences within a time interval for the representation of the image, depending on the determined image brightness ratios reduces a percentage of the image brightness ratios determined. This achieves an improvement of the gray value representation in the presence of dark images.
Figure imgaf001
EP04010513A 2003-05-07 2004-05-04 Method and apparatus for improving the display of grey levels in a pulse width modulated display device Ceased EP1484738A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10320299.4A DE10320299B4 (en) 2003-05-07 2003-05-07 Method and device for improving the gray value representation of a pulse-width-controlled image display device
DE10320299 2003-05-07

Publications (2)

Publication Number Publication Date
EP1484738A2 EP1484738A2 (en) 2004-12-08
EP1484738A3 true EP1484738A3 (en) 2006-07-05

Family

ID=33154498

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04010513A Ceased EP1484738A3 (en) 2003-05-07 2004-05-04 Method and apparatus for improving the display of grey levels in a pulse width modulated display device

Country Status (2)

Country Link
EP (1) EP1484738A3 (en)
DE (1) DE10320299B4 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100803545B1 (en) * 2006-07-20 2008-02-15 엘지전자 주식회사 Driving device for plasma display panel, and driving method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0965974A1 (en) * 1998-06-19 1999-12-22 Pioneer Electronic Corporation Method of and system for controlling brightness of plasma display panel
EP1014330A2 (en) * 1998-12-24 2000-06-28 Fujitsu Limited Control of the dynamic range of a display device
US20020036650A1 (en) * 1997-12-10 2002-03-28 Matsushita Electric Industrial Co., Ltd. PDP display drive pulse controller
US6380943B1 (en) * 1998-09-18 2002-04-30 Matsushita Electric Industrial Co., Ltd. Color display apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19832261A1 (en) * 1998-07-17 2000-01-20 Thomson Brandt Gmbh Arrangement for regulating the luminance
DE19833597A1 (en) * 1998-07-25 2000-01-27 Grundig Ag Pulse width modulated image display device e.g. for plasma display
DE19837307A1 (en) * 1998-08-18 2000-03-02 Grundig Ag Pulse width modulated image display such as a plasma screen that is controlled using a number of sequential time intervals within the display period
DE10112622A1 (en) * 2001-03-14 2002-09-19 Grundig Ag Method and device for improving the gray value resolution of a pulse width controlled image display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020036650A1 (en) * 1997-12-10 2002-03-28 Matsushita Electric Industrial Co., Ltd. PDP display drive pulse controller
EP0965974A1 (en) * 1998-06-19 1999-12-22 Pioneer Electronic Corporation Method of and system for controlling brightness of plasma display panel
US6380943B1 (en) * 1998-09-18 2002-04-30 Matsushita Electric Industrial Co., Ltd. Color display apparatus
EP1014330A2 (en) * 1998-12-24 2000-06-28 Fujitsu Limited Control of the dynamic range of a display device

Also Published As

Publication number Publication date
DE10320299A1 (en) 2004-12-02
EP1484738A2 (en) 2004-12-08
DE10320299B4 (en) 2016-08-11

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