EP1609130A1 - Reglage d'un affichage - Google Patents

Reglage d'un affichage

Info

Publication number
EP1609130A1
EP1609130A1 EP03816352A EP03816352A EP1609130A1 EP 1609130 A1 EP1609130 A1 EP 1609130A1 EP 03816352 A EP03816352 A EP 03816352A EP 03816352 A EP03816352 A EP 03816352A EP 1609130 A1 EP1609130 A1 EP 1609130A1
Authority
EP
European Patent Office
Prior art keywords
brightness
control
contrast
display panel
display
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Withdrawn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
EP03816352A
Other languages
German (de)
English (en)
Inventor
Petrus M. De Greef
Matthias Kruetzmann
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
Publication of EP1609130A1 publication Critical patent/EP1609130A1/fr
Withdrawn legal-status Critical Current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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • 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
    • G09G3/22—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
    • 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
    • G09G3/2077—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.
  • contrast and brightness can be regulated in the video stream before gamma compensation has been performed. This can be represented by a formula, which includes gamma:
  • 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 tat is converted into a digital brightness value.
  • APC unit When the APC unit is limiting the luminance of the PDP, contrast and brightness settings in the video stream will not have a predictable effect, while the APC unit will regulate to a new setting. This implies that optimal display performance cannot be obtained.
  • 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.
  • APC unit that controls luminance of the display panel
  • PDP a PDP
  • This provides optimal display performance with only little extra hardware cost.
  • digital video processing is not affected since the unit is separated from the video processing.
  • 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.
  • Fig. 1 illustrates a PDP generating light
  • Fig. 2 illustrates a PDP reflecting light
  • Fig. 3 illustrates a PDP generating and reflecting light
  • Fig. 4 illustrates a PDP generating, reflecting light and ambient light
  • Fig. 5 illustrates the configuration of an AC-driven plasma display apparatus according to a preferred embodiment of the invention. DETAILED DESCRIPTION OF THE INVENTION
  • a PDP device, plasma display controller and plasma display driving method ⁇ cording to various embodiments of the present invention will now be described in detail with reference to the accompanying drawing figures. the following, a PDP device will be described; however it should be noted that this is only an example of a display type. Other types of displays typically other sub-field driven displays, for instance liquid crystal displays (LCDs) etc are also within the scope of the invention as set out in the claims.
  • LCDs liquid crystal displays
  • 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. In some displays, 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 gray-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).
  • color saturation for instance to see the back-ground of a horror-scene
  • histogram control to get a warm or cool impression of an image.
  • These are typical video processing features not correlated to environmental conditions.
  • 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 gray- 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 Figs. 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 (Lj n ) as reflected light ( - ef ).
  • CR can be represented by a formula as follows:
  • the method comprises the step of providing manual contrast and/or brightness control by controlling the luminance of the display panel.
  • the luminance of the display panel is controlled according to the formula:
  • Video out (2 n -l) * ⁇ B + C*(Video in /2 n -l) ⁇ r
  • Videoi n digital video input signal
  • L out Luminance, light from display
  • B 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 -l) ⁇ y
  • FIG. 5 is a block diagram illustrating a preferred embodiment of a display system 10, according to another embodiment of the invention.
  • the display system 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 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.
  • various timing aspects can be included.
  • Temporary driving the display above the recommended automatic power control level can provide a better match with the user's u j-uands.
  • a display supports a limited number of gray-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.
  • the video processing chain is independent of binary distributed sub-field weights.
  • the video levels 1 2 4 8 16 32 64 128 result in e.g. the following sustain levels for respective successive sub-fields: 4 8 16 32 64 128 256 512.
  • 25 % reduction implies the following sustain levels for respective successive sub-fields: 3 6 12 24 48 96 192 384.
  • the invention can be realized by controlling contrast and brightness in a display panel by means of either 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.
  • Brightness can also be controlled in dependence on a user brightness control signal by controlled light generation during an erase phase of a display panel, by suitably adjusting the shape and/or number of erase pulses generated by the timing and control unit.

Landscapes

  • 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)

Abstract

Le contraste et la luminosité (3) d'un écran d'affichage (1) sont réglés soit au moyen d'une unité (4) de réglage automatique de la puissance qui règle déjà la luminance de l'écran d'affichage en modifiant le nombre d'impulsions de rafraîchissement par seconde, soit au moyen d'une unité de synchronisation et de réglage commandée par le logiciel qui règle déjà la luminance de l'écran d'affichage en modifiant le nombre d'impulsions de rafraîchissement par seconde.
EP03816352A 2003-03-20 2003-03-20 Reglage d'un affichage Withdrawn EP1609130A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2003/001148 WO2004084167A1 (fr) 2003-03-20 2003-03-20 Reglage d'un affichage

Publications (1)

Publication Number Publication Date
EP1609130A1 true EP1609130A1 (fr) 2005-12-28

Family

ID=33017805

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03816352A Withdrawn EP1609130A1 (fr) 2003-03-20 2003-03-20 Reglage d'un affichage

Country Status (4)

Country Link
EP (1) EP1609130A1 (fr)
CN (1) CN1759431A (fr)
AU (1) AU2003209955A1 (fr)
WO (1) WO2004084167A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3891499B2 (ja) * 1995-04-14 2007-03-14 パイオニア株式会社 プラズマディスプレイパネルにおける輝度調整装置
JP3580027B2 (ja) * 1996-06-06 2004-10-20 株式会社日立製作所 プラズマディスプレイ装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004084167A1 *

Also Published As

Publication number Publication date
CN1759431A (zh) 2006-04-12
WO2004084167A1 (fr) 2004-09-30
AU2003209955A1 (en) 2004-10-11

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