EP0992972A2 - Method of adjusting the light intensity of a cell of a flat panel display - Google Patents
Method of adjusting the light intensity of a cell of a flat panel display Download PDFInfo
- Publication number
- EP0992972A2 EP0992972A2 EP99119311A EP99119311A EP0992972A2 EP 0992972 A2 EP0992972 A2 EP 0992972A2 EP 99119311 A EP99119311 A EP 99119311A EP 99119311 A EP99119311 A EP 99119311A EP 0992972 A2 EP0992972 A2 EP 0992972A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- brightness
- signal
- cell
- variable
- analog
- 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- Withdrawn
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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
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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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
-
- 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
- G09G2320/0238—Improving the black level
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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
- 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
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
-
- 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
- G09G2320/0606—Manual adjustment
-
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Controls And Circuits For Display Device (AREA)
- Television Receiver Circuits (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of Gas Discharge Display Tubes (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Einstellung der Helligkeit einer Zelle eines Flachdisplays, die durch zeitliche Ansteuerung veränderbar ist, und eine Schaltungsanordnung zur Durchführung des Verfahrens.The invention relates to a method for adjusting the brightness of a cell a flat display that can be changed by time control, and a circuit arrangement for performing the method.
Wie bekannt, ist in Übereinstimmung mit Kathodenstrahlröhren auch bei Flachdisplays die Leuchtdichte das Bewertungsmaß für die Helligkeit, d.h., daß die unterschiedlichen Empfindlichkeiten des Auges für verschiedene Lichtwellenlängen berücksichtigt werden müssen. Aus diesem Grunde sind bei allen Geräten, die mit einem Flachdisplay ausgestattet sind, genauso wie bei allen Fernsehgeräten und Monitoren mit Kathodenstrahlröhren, Helligkeitsregler vorgesehen, bei deren Betätigung die Leuchtdichte jeder Zelle verändert wird. Bei Plasma-Displays wird dabei der gezündete Zustand der Zelle länger oder kürzer aufrechterhalten. Das zeitliche Maß ist dabei durch Digitalwerte, z.B. zwischen 0 und 255, bestimmt. Im Gegensatz zu Bildröhren wird bei einem solchen Plasma-Display ein 8-Bit-System mit dem Wertebereich von 0 bis 255 zur Verfügung gestellt. Das jeweilige 8-Bit-Wort, das das Video-Ausgangssignal verkörpert, läßt sich somit linear in der Helligkeit einstellen. Unter Flachdisplays werden Plasma-Displays und TFT- Displays und andere steuerbare Displays mit Einzelzellen verstanden.As is well known, in accordance with cathode ray tubes Flat displays the luminance the evaluation measure for the brightness, i.e. that the different sensitivities of the eye to different Light wavelengths must be taken into account. This is why for all devices that are equipped with a flat display, just like for all televisions and monitors with cathode ray tubes, brightness control provided, when pressed, the luminance of each cell is changed. With plasma displays, the ignited state of the Maintain cell longer or shorter. The measure of time is through Digital values, e.g. between 0 and 255. In contrast to picture tubes with such a plasma display, an 8-bit system with the value range provided from 0 to 255. The respective 8-bit word, the embodies the video output signal, so it can be linear in brightness to adjust. Flat displays include plasma displays and TFT displays and other controllable displays with single cells understood.
Bei einer Helligkeits-Schwarzwert-Einstellung im herkömmlichen Sinn wird die Amplitude des Signals nicht verändert, jedoch der dem Schwarzwert proportionale DC-Wert verschoben. Dies kommt beim Plasma-Display einer sofortigen nicht akzeptablen Übersteuerung gleich.With a brightness-black level setting in the conventional sense the amplitude of the signal does not change, but that of the black level proportional DC value shifted. This comes with a plasma display immediate unacceptable clipping equal.
Um die ohnehin im Vergleich mit Kathodenstrahl-Bildröhren geringere
Leuchtdichte der Displays zu nutzen, wird bereits im Auslieferungszustand
das Display voll ausgesteuert, d.h. ein Abgleich vollzogen, so daß dem
Schwarzwert die Zahl 0 und dem Weißwert die höchste Zahl des Wertebereiches,
z.B. 255, zugeordnet ist. To the smaller in comparison to cathode ray tubes
Using the display's luminance is already in the delivery state
the display is fully controlled, i.e. a comparison was made so that the
Black value the
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Schaltungsanordnung anzugeben, die eine Übersteuerung verhindern und eine Verbesserung des Helligkeitsempfindens bewirken.The invention has for its object a method and a circuit arrangement specify that prevent an oversteer and a Improve brightness perception.
Die Aufgabe löst die Erfindung durch das im Anspruch 1 angegebene
Verfahren sowie durch eine Schaltungsanordnung zur Durchführung des
Verfahren, so wie sie im Anspruch 8 angegeben ist.The object is achieved by the invention as specified in
Gemäß der Erfindung werden die Helligkeitseinstellgrößen nicht mehr als lineare Größen generiert sondern abhängig vom subjektiven Helligkeitsempfinden eingestellt. Dabei wird der absolute Schwarzwert, der z.B. dem Einstellwert 0 des Wertebereiches entspricht, festgehalten und der Bereich von schwarz bis hellgrau gedehnt und im weißen Bereich derart gestaucht, daß die Amplitude unverändert bleibt. Das Video-Eingangssignal wird durch die nichtlineare Aussteuerung der Helligkeitseinstellgröße in Abhängigkeit von festgelegten Koeffizienten modifiziert, die display- oder betrachterspezifisch festgelegt sein können. Die modifizierte Helligkeitseinstellgröße ist ein Spiegelbild des subjektiven Helligkeitsempfindens. Mit dieser modifizierten Helligkeitseinstellgröße werden sodann die Schaltzeiten der Zellen von der Steuerschaltung bestimmt.According to the invention, the brightness setting variables are no more than linear quantities are generated instead depending on the subjective perception of brightness set. The absolute black value, e.g. the set value Corresponds to 0 of the range of values, and the range of stretched black to light gray and so compressed in the white area that the amplitude remains unchanged. The video input signal is through the non-linear control of the brightness setting variable depending on fixed coefficients modified, the display or viewer specific can be fixed. The modified brightness setting variable is a mirror image subjective perception of brightness. With this modified brightness setting variable Then the switching times of the cells from the control circuit certainly.
Vorteilhafte Weiterbildungen des erfindungsgemäßen Verfahrens sind in den Ansprüchen 2 bis 7, vorteilhafte Ausgestaltungen der Erfindung in den Ansprüchen 9 bis 12 angegeben.Advantageous developments of the method according to the invention are in the Claims 2 to 7, advantageous embodiments of the invention in the claims 9 to 12 indicated.
Die Erfindung wird nachfolgend anhand des einzigen Blockschaltbildes ergänzend erläutert.The invention is described below using the single block diagram additionally explained.
Das Blockschaltbild zeigt einen Videoprozessor 1, in welchem das Video-Eingangssignal,
das am Eingang 2 anliegt, durch ein Helligkeitssignal, das
an einem Eingang 3 eines Mikroprozessors 4 anliegt, modifiziert wird. Dieses
Helligkeitssignal wird vom Mikroprozessor 4 digitalisiert, falls es noch nicht in
digitaler Form anliegt, und einer Koeffenzientenbewertung unterworfen, so
daß bei linearer Veränderung des Helligkeitssignals über einen I2C- Bus 5
dem Videoprozessor ein modifiziertes Helligkeitssignal zugeführt wird, das
dem subjektiven Helligkeitsempfinden entspricht. Die Signalamplituden,
bezogen auf den Eingangswert des Helligkeitssignals, sind in der im Video-prozessor
eingezeichneten Kurve ersichtlich. Entsprechend der Funktion
(
Claims (12)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998145187 DE19845187A1 (en) | 1998-10-01 | 1998-10-01 | Method for adjusting the brightness of a cell on a flat display |
DE19845187 | 1998-10-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0992972A2 true EP0992972A2 (en) | 2000-04-12 |
EP0992972A3 EP0992972A3 (en) | 2000-10-25 |
Family
ID=7883030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99119311A Withdrawn EP0992972A3 (en) | 1998-10-01 | 1999-09-29 | Method of adjusting the light intensity of a cell of a flat panel display |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0992972A3 (en) |
DE (1) | DE19845187A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1217599A2 (en) * | 2000-12-22 | 2002-06-26 | Visteon Global Technologies, Inc. | Variable resolution control system and method for a display device |
CN100452134C (en) * | 2004-12-03 | 2009-01-14 | 惠普开发有限公司 | Methods and systems to control electronic display brightness |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1762353A1 (en) * | 1967-06-01 | 1970-04-30 | Thomson Houston Comp Francaise | Circuit for adjustable gamma correction in a television system |
US4589022A (en) * | 1983-11-28 | 1986-05-13 | General Electric Company | Brightness control system for CRT video display |
JPH05100652A (en) * | 1991-10-04 | 1993-04-23 | Kokusai Electric Co Ltd | Brightness characteristic controller for display unit |
EP0614321A2 (en) * | 1993-03-02 | 1994-09-07 | Fujitsu General Limited | Color display unit with plasma display panel |
US5754150A (en) * | 1995-02-17 | 1998-05-19 | Sharp Kabushiki Kaisha | Liquid crystal luminance adjusting apparatus |
US5757343A (en) * | 1995-04-14 | 1998-05-26 | Pioneer Electronic Corporation | Apparatus allowing continuous adjustment of luminance of a plasma display panel |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0437263A (en) * | 1990-05-31 | 1992-02-07 | Matsushita Electric Ind Co Ltd | Gradation correction device |
DE4217594A1 (en) * | 1992-05-27 | 1993-12-02 | Siemens Nixdorf Inf Syst | Brightness and-or contrast control for VDU - has control matrix in front of screen control, with photosensitive sensor circuit for luminance value |
US6362835B1 (en) * | 1993-11-23 | 2002-03-26 | Texas Instruments Incorporated | Brightness and contrast control for a digital pulse-width modulated display system |
DE19509035B4 (en) * | 1994-03-23 | 2007-06-28 | Carl Zeiss Optronics Gmbh | Method for controlling the brightness of a screen display and device, in particular thermal imaging device, with it |
DE19720876A1 (en) * | 1997-05-17 | 1998-11-19 | Grundig Ag | Method and device for adjusting the contrast in pulse-width-controlled image displays |
DE19721984C2 (en) * | 1997-05-26 | 1999-10-07 | Siemens Ag | monitor |
-
1998
- 1998-10-01 DE DE1998145187 patent/DE19845187A1/en not_active Withdrawn
-
1999
- 1999-09-29 EP EP99119311A patent/EP0992972A3/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1762353A1 (en) * | 1967-06-01 | 1970-04-30 | Thomson Houston Comp Francaise | Circuit for adjustable gamma correction in a television system |
US4589022A (en) * | 1983-11-28 | 1986-05-13 | General Electric Company | Brightness control system for CRT video display |
JPH05100652A (en) * | 1991-10-04 | 1993-04-23 | Kokusai Electric Co Ltd | Brightness characteristic controller for display unit |
EP0614321A2 (en) * | 1993-03-02 | 1994-09-07 | Fujitsu General Limited | Color display unit with plasma display panel |
US5754150A (en) * | 1995-02-17 | 1998-05-19 | Sharp Kabushiki Kaisha | Liquid crystal luminance adjusting apparatus |
US5757343A (en) * | 1995-04-14 | 1998-05-26 | Pioneer Electronic Corporation | Apparatus allowing continuous adjustment of luminance of a plasma display panel |
Non-Patent Citations (5)
Title |
---|
COREL CORPORATION: "COREL DRAW! 4", 1993, COREL CORPORATION, DEUTSCHLAND, SEITEN 405-406 * |
HUNT, R. W. G.: "The Reproduction of Colour", 1995, FOUNTAIN PRESS, KINGSTON-UPON-THAMES, ENGLAND, SEITEN 455-458 * |
NEUMEYER, HEICO: "PAINT SHOP PRO 5", 1999, WILHELM HEYNE, MUENCHEN, SEITEN 17, 207-208, 425; SOFTWARE SEIT 09/1998 IN DEUTSCHLAND FREI VERFUEGBAR * |
PATENT ABSTRACTS OF JAPAN vol. 017, no. 451 (P-1595), 18. August 1993 (1993-08-18) -& JP 05 100652 A (KOKUSAI ELECTRIC CO LTD), 23. April 1993 (1993-04-23) * |
PATTERSON, RICHARD: 'Gamma Correction and Tone Reproduction in Scanned Photographic Images' SMTPE JOURNAL Bd. 103, Nr. 6, Juni 1994, WHITE PLAINS, NY (USA), Seiten 377 - 385, XP000457571 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1217599A2 (en) * | 2000-12-22 | 2002-06-26 | Visteon Global Technologies, Inc. | Variable resolution control system and method for a display device |
EP1217599A3 (en) * | 2000-12-22 | 2004-12-01 | Visteon Global Technologies, Inc. | Variable resolution control system and method for a display device |
CN100452134C (en) * | 2004-12-03 | 2009-01-14 | 惠普开发有限公司 | Methods and systems to control electronic display brightness |
Also Published As
Publication number | Publication date |
---|---|
DE19845187A1 (en) | 2000-04-13 |
EP0992972A3 (en) | 2000-10-25 |
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