EP1347434A1 - Commande du contraste et de la brillance d'un dispositif d'affichage - Google Patents

Commande du contraste et de la brillance d'un dispositif d'affichage Download PDF

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Publication number
EP1347434A1
EP1347434A1 EP02076072A EP02076072A EP1347434A1 EP 1347434 A1 EP1347434 A1 EP 1347434A1 EP 02076072 A EP02076072 A EP 02076072A EP 02076072 A EP02076072 A EP 02076072A EP 1347434 A1 EP1347434 A1 EP 1347434A1
Authority
EP
European Patent Office
Prior art keywords
contrast
brightness
display panel
display
video
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Withdrawn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
EP02076072A
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German (de)
English (en)
Inventor
designation of the inventor has not yet been filed The
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP02076072A priority Critical patent/EP1347434A1/fr
Publication of EP1347434A1 publication Critical patent/EP1347434A1/fr
Withdrawn legal-status Critical Current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
    • G09G3/288—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
    • 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
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2044—Display of intermediate tones using dithering
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods

Definitions

  • the present invention relates to the control of a display, and more particularly to contrast and brightness control of a display.
  • L out ⁇ B + C*(Video in /2 n -1) ⁇ y
  • Video in digital video input signal
  • L out Luminance, light from display
  • a control unit can be used for controlling the consumed electric power of a display, for instance so that a brightness level is forcibly lowered to suppress consumption of power below a predetermined level.
  • An Automatic Power Control (APC) unit avoids overloading the PDP (the panel and the power-supply of the PDP).
  • APC Automatic Power Control
  • the consumption of electric power is detected by detecting a mean current flowing through a high voltage power source that drives the PDP.
  • the detected current value is compared to a reference value and periodically the APC unit modifies signals driving the PDP.
  • US-A-5 956 014 describes an analog brightness value set by a variable resistor that is converted into a digital brightness value.
  • the object is realized by implementing contrast and brightness control in the video stream as a programmable Color LookUp Table (CLUT) unit, typically combining it with existing gamma and color point functions. This reduces the hardware cost and improves processing accuracy, since one quantization step can be omitted.
  • CLUT Color LookUp Table
  • the object is realized by implementing contrast and brightness control independent from the video processing, close to the display.
  • contrast and brightness are implemented in an existing power control unit, typically an APC unit that controls luminance of the display panel, typically a PDP.
  • an existing power control unit typically an APC unit that controls luminance of the display panel, typically a PDP.
  • contrast and brightness regulations are performed in the APC unit by varying the number of sustain pulses per second. In this way, new settings will have a predictable effect.
  • the brightness of the display panel is set by increasing or decreasing the number of sustain pulses (per time period) to a given sub-field of the display panel in accordance with a given brightness value.
  • a user is often equipped with a set of controls to adjust a display to a specific environment or to adjust video processing to personal preferences.
  • an automated process driven by data from sensors might take care of the adjustment of the display for specific environmental conditions.
  • Other displays will require the user to give feedback via the user controls.
  • a user may like to change some settings to match with personal preferences, examples are for instance: color saturation, more contrast at specific grey-levels (for instance to see the back-ground of a horror-scene), histogram control or color-point (to get a warm or cool impression of an image).
  • the image quality of a PDP device depends on parameters such as: black-level, contrast ratio (dark room/dim surround/daylight), dynamic peak white (small area and short time), average peak white (large area and continuous), white point (e. g. D65), number of displayable grey-levels, and dithering. Contrast and brightness control are user settings, influencing the luminance and contrast ratio. This will be described below with reference to accompanying drawing figures 1-4.
  • Fig. 1 it is illustrated a PDP 1 generating light (illustrated by arrows going out from the PDP).
  • the PDP reflects incident light (L in ) as reflected light (L ref ).
  • CR filter plate transparency ⁇ 1.
  • the method comprises the step of providing manual contrast and/or brightness control by controlling the luminance of the display panel.
  • Video in digital video input signal
  • L out Luminance
  • light from display Brightness offset
  • n Resolution
  • y Gamma value or in an existing gamma correction unit, according to the formula:
  • L out ⁇ B + C*(Video in /2 n -1) ⁇ y
  • Fig. 5 is a block diagram illustrating a preferred embodiment of a display system 10, provided with a PDP 1, a contrast/brightness controller 3, an automatic power control unit 4, a sub-field processor 2, a dithering unit 5, and a gamma unit 6.
  • contrast and brightness control can be combined with the gamma processing. It can be implemented as one LUT 8. Its content can be calculated off-line by a ⁇ -controller (not shown) and downloaded into the LUT 8.
  • a user might like to have the classic controls available, even if they would not be required for an optimal adjustment of the display. For PDP devices this would be the brightness control.
  • the classic effect can be replaced by another effect. For instance, it is possible to use a slight modification of the LUT content to provide more contrast in the dark areas of a scene, at the cost of contrast in the brighter areas.
  • a user-controlled video-dependent luminance component is added to the normal luminance due to gamma to get a modified gamma curve which results in a higher contrast in darker areas (steeper gamma curve) and less contrast for brighter areas (less steep gamma curve).
  • FIG. 6 An alternative embodiment of the invention will now be described, with reference to Fig. 6, in which it is illustrated how contrast/brightness control is provided in an automatic power control (APC) unit.
  • APC automatic power control
  • Fig. 6 is a block diagram illustrating a preferred embodiment of a display system 10, in the following referred to as a "display", according to another embodiment of the invention.
  • the display 10 comprises a PDP 1 having display cells arranged in a X-Y orthogonal matrix, a processor unit 2, a contrast/brightness controller 3 and an automatic power control unit 4.
  • the PDP 1 is of conventional type and will therefore not be described in more detail since PDPs are well known.
  • the contrast/brightness controller 3 is connected to the automatic power control unit 4, or can be a part of the same. Also software-only solutions are possible, provided that the contrast/brightness controller 3 is adjacent to or part of the power control unit 4.
  • the data to be displayed is written for every line, and then the PDP is maintained by sustain discharges.
  • the brightness of the PDP varies in proportion to the number of sustain discharges per time interval, and hence the brightness can be changed by the number of sustain discharges.
  • the automatic power control unit 4 modulates the consumed power of a display, in this embodiment the PDP 1.
  • the generated light is regulated by changing the number of sustain pulses per second to the PDP. After image load of a frame has been determined, the light generated by the image can be amplified or attenuated, save guarding the PDP.
  • the APC unit In a conventional PDP device, in case the APC unit is attenuating the image to reduce the power consumption or temperature, the luminance of the image is reduced. In this case, a user might try to change contrast/brightness settings to increase the luminance. When amplifying the video-data, the APC unit would immediately attenuate the image representation, back to the initial level but at reduced quality. This can be avoided by providing the contrast/brightness settings to the automatic power control unit according to the invention as implemented in the embodiment shown in Fig. 6.
  • the controller 3 can be arranged to provide for a user to set parameters to satisfy the user.
  • the digital video processing is not affected by the user-controllable contrast and brightness settings, since the settings are implemented after the processing has been performed in the processor 2. Therefore, it is possible to exploit the full available dynamic range for video data processing.
  • the contrast and brightness of the PDP are set by increasing or decreasing the number of sustain pulses (per time period) to a given sub-field of the PDP 1 in accordance with the given values. This is a very accurate control mechanism, which gives an optimal and predictable adjustment.
  • the brightness is typically set to "0", while a minimum luminance pixel is already clearly visible.
  • Amplifying the sustain level of sub-fields (C) resembles the effect of a contrast regulation. It can be noted that these variations are performed in the luminance domain instead of the video domain, however this has no impact.
  • the contrast/brightness controller 3 is implemented in the automatic power control unit 4, preferably in a timing and control unit of the same (not shown), it can provide an optimal display performance, driven by software, with only little extra hardware cost.
  • Temporary driving the display above the recommended automatic power control level can provide a better match with the user's demands.
  • a display supports a limited number of grey-levels, combined with dithering.
  • user-control and APC regulate the video level
  • for each pixel a course stepwise variation of the video level is calculated.
  • the dynamic range of the video-data must allow increasing video-levels.
  • variations on the sustain level step-size will cause variations of image representation at a more accurate resolution.
  • the video processing chain is independent of binary distributed sub-field weights.
  • the invention can be realized by controlling contrast and brightness in a display panel by means of either a gamma correction unit, controlling luminance of the display panel by varying video levels, an automatic power control unit, already controlling luminance of the display panel by varying a number of sustain pulses per second, or a timing and control unit, controlled by software process which is already controlling luminance of the display panel by varying a number of sustain pulses per second.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)
EP02076072A 2002-03-18 2002-03-18 Commande du contraste et de la brillance d'un dispositif d'affichage Withdrawn EP1347434A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02076072A EP1347434A1 (fr) 2002-03-18 2002-03-18 Commande du contraste et de la brillance d'un dispositif d'affichage

Applications Claiming Priority (1)

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EP02076072A EP1347434A1 (fr) 2002-03-18 2002-03-18 Commande du contraste et de la brillance d'un dispositif d'affichage

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EP1347434A1 true EP1347434A1 (fr) 2003-09-24

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1624678A1 (fr) * 2004-03-05 2006-02-08 Matsushita Electric Industries Co., Ltd. Procede de traitement de signaux d'images, appareil de traitement de signaux d'images et appareil d'affichage d'images
EP1796064A1 (fr) * 2005-12-12 2007-06-13 Deutsche Thomson-Brandt Gmbh Appareil de commande d'un panneau d'affichage à plasma au moyen d'une pré-mesure APL, et procédé correspondant
EP1796065A1 (fr) * 2005-12-12 2007-06-13 Thomson Licensing Appareil de commande d'un panneau d'affichage à plasma au moyen d'une pré-mesure APL, et procédé correspondant
EP1821277A2 (fr) * 2006-02-20 2007-08-22 Thomson Licensing Procédé de commande d'un panneau d'affichage à plasma avec estimation et compensation de l'atténuation, et appareil correspondant
CN100423050C (zh) * 2003-10-16 2008-10-01 三星Sdi株式会社 等离子体显示面板装置、白色线性控制装置及其控制方法
CN113870746A (zh) * 2021-09-23 2021-12-31 北京德为智慧科技有限公司 一种显示器的测试方法、显示器、终端设备及存储介质

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0811963A1 (fr) * 1996-06-06 1997-12-10 Hitachi, Ltd. Dispositif d'affichage d'image par plasma et son procédé de commande
US5757343A (en) * 1995-04-14 1998-05-26 Pioneer Electronic Corporation Apparatus allowing continuous adjustment of luminance of a plasma display panel
US6160532A (en) * 1997-03-12 2000-12-12 Seiko Epson Corporation Digital gamma correction circuit, gamma correction method, and a liquid crystal display apparatus and electronic device using said digital gamma correction circuit and gamma correction method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5757343A (en) * 1995-04-14 1998-05-26 Pioneer Electronic Corporation Apparatus allowing continuous adjustment of luminance of a plasma display panel
EP0811963A1 (fr) * 1996-06-06 1997-12-10 Hitachi, Ltd. Dispositif d'affichage d'image par plasma et son procédé de commande
US6160532A (en) * 1997-03-12 2000-12-12 Seiko Epson Corporation Digital gamma correction circuit, gamma correction method, and a liquid crystal display apparatus and electronic device using said digital gamma correction circuit and gamma correction method

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100423050C (zh) * 2003-10-16 2008-10-01 三星Sdi株式会社 等离子体显示面板装置、白色线性控制装置及其控制方法
US7649507B2 (en) 2003-10-16 2010-01-19 Samsung Sdi Co., Ltd. Plasma display panel device, white linearity control device and control method thereof
EP1624678A1 (fr) * 2004-03-05 2006-02-08 Matsushita Electric Industries Co., Ltd. Procede de traitement de signaux d'images, appareil de traitement de signaux d'images et appareil d'affichage d'images
US7439984B2 (en) 2004-03-05 2008-10-21 Matsushita Electric Industrial Co., Ltd. Image signal processing method, image signal processing apparatus, and image displaying apparatus
EP1624678A4 (fr) * 2004-03-05 2007-10-10 Matsushita Electric Ind Co Ltd Procede de traitement de signaux d'images, appareil de traitement de signaux d'images et appareil d'affichage d'images
CN1983361B (zh) * 2005-12-12 2010-06-30 汤姆森许可贸易公司 使用apl预测量来驱动等离子体显示板的设备及对应方法
EP1796065A1 (fr) * 2005-12-12 2007-06-13 Thomson Licensing Appareil de commande d'un panneau d'affichage à plasma au moyen d'une pré-mesure APL, et procédé correspondant
EP1796064A1 (fr) * 2005-12-12 2007-06-13 Deutsche Thomson-Brandt Gmbh Appareil de commande d'un panneau d'affichage à plasma au moyen d'une pré-mesure APL, et procédé correspondant
US8125500B2 (en) 2005-12-12 2012-02-28 Thomson Licensing Apparatus for driving a plasma display panel with APL pre-measurement and corresponding method
TWI411995B (zh) * 2005-12-12 2013-10-11 Thomson Licensing 電漿顯示面板之驅動裝置及方法
EP1821277A2 (fr) * 2006-02-20 2007-08-22 Thomson Licensing Procédé de commande d'un panneau d'affichage à plasma avec estimation et compensation de l'atténuation, et appareil correspondant
EP1821277A3 (fr) * 2006-02-20 2010-02-17 Thomson Licensing Procédé de commande d'un panneau d'affichage à plasma avec estimation et compensation de l'atténuation, et appareil correspondant
CN113870746A (zh) * 2021-09-23 2021-12-31 北京德为智慧科技有限公司 一种显示器的测试方法、显示器、终端设备及存储介质
CN113870746B (zh) * 2021-09-23 2024-03-01 北京德为智慧科技有限公司 一种显示器的测试方法、显示器、终端设备及存储介质

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