EP1437706A2 - Procédé pour optimiser la luminosité dans un dispositif d' affichage et dispositif pour la mise en oeuvre de ce procédé - Google Patents

Procédé pour optimiser la luminosité dans un dispositif d' affichage et dispositif pour la mise en oeuvre de ce procédé Download PDF

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Publication number
EP1437706A2
EP1437706A2 EP20040290015 EP04290015A EP1437706A2 EP 1437706 A2 EP1437706 A2 EP 1437706A2 EP 20040290015 EP20040290015 EP 20040290015 EP 04290015 A EP04290015 A EP 04290015A EP 1437706 A2 EP1437706 A2 EP 1437706A2
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Prior art keywords
sustain pulses
sustain
picture
threshold value
frequency
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EP20040290015
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German (de)
English (en)
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EP1437706A3 (fr
Inventor
Sebastien Weitbruch
Cedric Thebault
Carlos Correa
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Thomson Licensing SAS
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Priority claimed from EP20030290062 external-priority patent/EP1437705A1/fr
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Priority to EP04290015A priority Critical patent/EP1437706A3/fr
Publication of EP1437706A2 publication Critical patent/EP1437706A2/fr
Publication of EP1437706A3 publication Critical patent/EP1437706A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • G09G3/2946—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 introducing variations of the frequency of sustain pulses within a frame or non-proportional variations of the number of sustain pulses in each subfield
    • 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
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • 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
    • G09G2330/06—Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
    • 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 method and an apparatus for optimizing brightness in a display device. More specifically, the invention is related to a kind of video processing for improving the picture quality of pictures which are displayed on displays like plasma display panels (PDP) and all kind of displays based on the principle of duty cycle modulation ( pulse width modulation) of light emission.
  • the method and the apparatus aim at reducing the EMI (Electro-Magnetic Interference) problems.
  • the plasma display technology now makes it possible to achieve flat colour panels of large size and with limited depth without any viewing angle constraints.
  • the size of the displays may be much larger than the classical CRT picture tubes would have ever been allowed.
  • European TV sets a lot of work has been made to improve its picture quality. Consequently, there is a strong demand, that a TV set built in a new technology like the plasma display technology has to provide a picture so good or better than the old standard TV technology.
  • This picture quality can be decomposed in different parameters such as:
  • a plasma display panel utilizes a matrix array of discharge cells, which could only be “on” or “off'.
  • a PDP controls the gray levels by modulating the number of light pulses per frame. The eye will integrate this time-modulation over a period corresponding to the eye time response. Since the video amplitude determines the number of light pulses, occurring at a given frequency, more amplitude means more eye pulses and thus more "on” time. For this reason, this kind of modulation is known as PWM, ( for pulse width modulation).
  • PWM pulse width modulation
  • a first selective operation called "addressing" will create a charge in the cell to be lighted.
  • Each plasma cell can be considered as a capacitor, which keeps the charge for a long time.
  • a general operation called “sustain” applied during the lighting period will add charges in the cell. Only in the cells addressed during the first selective operation, the two charges build up and that brings a firing voltage between two electrodes of the cell. UV radiation is generated and the UV radiation excites the phosphorous for light emission.
  • the cell will be lighted in small pulses at a given sustain frequency.
  • an erase operation will remove all the charges to prepare a new cycle.
  • the frame period is divided in 8 sub fields, each one corresponding to a bit.
  • the number of light pulses for the bit 2 is the double as for the bit 1 and so forth. So it is possible through sub fields combination to build the 256 gray levels. This is only an example, as the number of sub fields or of priming could be modified in view of the quality factor to improve.
  • the picture introducing the higher power consumption is a full-white picture. Therefore, for a required power consumption and for a given electronic efficacy, the luminance of the full-white is fixed. Then, for all other picture content, the peak-luminance will be adapted to have stable power consumption as shown on Figure 2.
  • This figure shows the decrease of the luminance when the picture load increases from a peak white picture to a full white picture. More precisely, when a PDP screen displays a full white picture (right screen in Figure 2), less luminance is needed by the eye to catch a nice impression of luminance since this luminance is displayed on a very large part of the visual field. On the other hand, when a PDP screen displays a picture having low energy (left screen in Figure 2) the contrast ratio is very important for the eye. In that case, the highest available white luminance should be output on such a picture to enhance the contrast ratio.
  • the luminance as well as the power consumption is directly linked to the number of sustain pulses per frame. This has the disadvantage of allowing only a reduced number of discrete power levels compared to an analog system.
  • the concept of power management adapted to a PDP is based on the change of the total amount of sustain pulses depending on picture content in order to keep the overall power consumption constant.
  • Such a concept is illustrated on Figure 3 that shows the number of sustain pulses in relation with the picture load.
  • APL for Average Power Level can be computed as following: where I(x,y) represents the displayed picture having C columns and L lines.
  • the distribution of sustain pulses among the sub-field sequence should be performed.
  • a high number of sub-fields is mandatory to ensure high quality display with reduced moving artifacts.
  • every addressing operation required for each sub-field corresponds to idle time where no light pulse can be produced.
  • the available sustain frequency is fixed and normally corresponds to an optimal panel functioning to avoid luminance variation depending on picture content.
  • the optimal sustain frequency was fixed for all APL values and set to the optimal value (e.g. 200 kHz in the present example). Obviously, this will reduce the capability of the panel to display high peak luminance for a high number of sub-fields. Therefore, new approaches have been defined in the past in order to reach higher peak-luminance at good panel homogeneity. Some of the solutions are described, for example, in WO00/46782 or WO02/11111 in the name of the applicant. Since high peak luminance is only mandatory for picture having low charge, which also means picture being less sensitive to the homogeneity problems, the optimal sustain frequency is not required there. Therefore the actual state of the art for optimized power management is based on a variation of the sustain frequency for low-charged pictures as shown on Figure 4 for a 12 sub-fields distribution.
  • the sustain frequency is fixed to a given value, for example 200KHz at 100% charge and 320KHz for low charge. There is only a shift of the sustain frequency value.
  • the EMI (Electro-Magnetic Interference) peak observed at the sustain frequency will also evolve in its position as the sustain frequency. It will stay strong, always requiring a strong filter that decreases the brightness.
  • the panel efficacy as well as the voltage margin of the panel depend strongly of the sustain frequency. In other words, if the sustain frequency is too far away from the optimal value, a loss of margin as well as efficiency could happen. Moreover, the impact on the margin and efficacy will be stronger on low sub-fields (LSB) having less energy. In that case, if the APL changes between two pictures having a lot of similarities, changes in the dark areas can be perceptible (the eye is much more sensitive in those regions).
  • the present invention proposes a new method and an apparatus that solve the above problems.
  • the present invention relates to a method for optimizing brightness in a display device having a plurality of luminous elements corresponding to the pixels of a picture, wherein the time duration of a video frame or video field is divided into a plurality of sub fields during which the luminous elements can be activated for light emission with sustain pulses corresponding to a sub field code word which is used for brightness control, the total number of sustain pulses being determined in view of a selected power mode function of picture load the method including the following steps:
  • the threshold value is set at a number of sustain pulses corresponding to a given percentage of the APL (Average Power Level) of a full white picture.
  • the selected number is such that every picture presents a perfect homogeneity.
  • the fixed frequency corresponds to the optimal sustain frequency which gives a stable panel behavior and the evolving frequency will increase progressively following a linear progression or other types of progressions such as a progression using a multiplying factor.
  • the invention also consists in an apparatus for carrying out the inventive method.
  • the apparatus comprises at least an average picture power measuring circuit, a sub field coding unit and a power level control unit storing a table of power level mode, said apparatus further comprising a counter for counting the actual number of the sustain pulses and means for comparing the actual number to the threshold value and for modifying the length of said sustain pulses according to the progression function used.
  • the method of the present invention will be described with reference to a PDP using an ADS addressing method as described above with a sub field organization of 12 sub fields.
  • This sub field organization is only an example, other organizations known from the literature with e.g. more sub fields and /or different sub fields weights may be used for improving the picture quality.
  • the method of the present invention also uses a power control method as described for example in WO00/46782 in the name of Thomson Licensing S.A.
  • This method determines the number of sustain pulses as a function of the average picture power, i.e. it switches between different modes with different power levels.
  • the total number of sustain pulses depends on the measure of the Power Level Enhancement (PLE) or of the Average Power Level (APL) for a given picture. So for a full white picture, the number of sustain pulses is low and for a peak white picture the number of sustain pulses is high for the same power consumption.
  • PLE Power Level Enhancement
  • APL Average Power Level
  • the method is also based on the fact that the duration of each sustain pulse determines the quantity of sustain pulses which can be made per frame period depending on the time which stays free for sustaining. This also determines the frequency of the sustain pulses. Generally, there is a minimum for the sustain pulse duration to ensure a good sustain operation enabling a good panel response fidelity. The rest of the sustain duration constitutes a margin which can be used to adjust the sustain frequency to the panel behavior. In fact, each panel will have a domain in which its behavior is quite stable. A stable panel behavior is obtained for a certain sustain frequency or optimal sustain frequency which is in fact lower than the frequency required to achieve a maximum peak white but gives a homogeneous picture rendition (high charged line and low charged line will have the same luminance).
  • the method of the present invention consists, first of all, in setting a threshold value in relation to the picture load.
  • the threshold value is in fact an amount of sustain pulses corresponding to a certain percentage of picture load. This percentage corresponds to the limit of picture load having a perfect homogeneity.
  • the threshold value is fixed and may be stored in a table in the PDP control IC. A practical example will be given hereafter.
  • the method consists in comparing, for a frame, the number of the current sustain pulses to said threshold value and if said number is below the threshold value, generating the sustain pulses at a fixed frequency or if said number is above, generating the sustain pulses at an evolving frequency. So, the sustain frequency for high charged pictures such that pictures corresponding to an APL between 100% and 75% for instance, should stay at the optimal value, while for the low charged picture below 75%, the sustain frequency is increasing, replacing the previous sustain peak with high amplitude by a larger spectrum at lower amplitude as shown on figure 5.
  • the figure 5 clearly shows that the utilization of a variable sustain frequency for pictures having a high peak luminance leads to a reduction of the amplitude of the EMI (Electro Magnetic Interference) radiation.
  • the energy spread is the same but spread on a larger amount of frequencies; so it is less disturbing. Consequently a higher brightness is obtained without the problem of EMI.
  • the implementation of the concept uses a count of the number of sustains, to decide of the length of the new sustain operation to be performed.
  • a variable S corresponding to the actual sustain number is defined.
  • the length of the sustain pulse (frequency) will depend on this value S.
  • the relation between this duration and the value S will compute based on the following information:
  • the length of the sustain pulse can be computed as shown in the next example.
  • the threshold value C is equal to 500
  • the maximal number of sustain pulses for a peak white is equal to 2000
  • the available time for sustain operation is 4ms.
  • the 500 first sustain pulses will have an optimal duration of 2.5 ⁇ s corresponding to the optimal working frequency of 200kHz.
  • the time required for these 500 first sustain pulses is 1250 ⁇ s, so 1750 ⁇ s are free for the 1500 other sustain pulses.
  • the advantage of this concept is to dispose of a stable and optimized sustain frequency for high charged picture (low number of sustain pulses) which are the most critical pictures for homogeneity.
  • the duration of the sustain signal is going from 2.5 ⁇ s down to 1.16 ⁇ s enabling a large spread of the frequency from 200kHz (2.5 ⁇ s) up to 430kHz (1.16 ⁇ s).
  • Fig. 8 a block diagram of a circuit implementation for the above explained method is shown.
  • RGB data from a video degamma block 10 is analysed in the average power measure block 11 which gives the computed average power value APL to the PWE control block 12.
  • the average power value of a picture can be calculated by simply summing up the pixel values for all RGB data streams and dividing the result through the number of pixel values multiplied by three, using the following formula where M represents the total amount of pixels.
  • Information on the contrast level and brightness level settings from the user are also sent to the block 12 as represented by the blocks 17 and 18
  • the control block 12 consults its internal power level mode table located, for example in a LUT (for Look Up Table). It directly generates the selected mode control signals for the other processing blocks. It selects the sustain table and the sub field encoding table to be used.
  • the sub-field coding process is done in the sub-field coding unit 13.
  • a sub-field code word is assigned to each pixel value.
  • the PWE control block 12 also controls the writing WR of RGB pixel data in the frame memory 14, the reading RD of RGB sub-field data SF-R, SF-G, SF-B from the second frame memory 14, and the serial to parallel conversion circuit 15 via control line SP. It generates the SCAN and SUSTAIN pulses required to drive the driver circuits for PDP 16. In that case, the length of the addressing signal (addressing speed) will be taken from the LUT for each line of the panel.
  • an implementation can be made with two frame memories. Data is written into one frame memory pixel-wise, but read out from the other frame memory sub-field-wise. In order to be able to read the complete first sub-field a whole frame must already be present in the memory. This calls for the need of two whole frame memories. While one frame memory is being used for writing, the other is used for reading, avoiding in this way reading the wrong data.
  • the invention can be used for all kinds of displays which are controlled by using a PWM like control of the light emission for grey-level variation.
EP04290015A 2003-01-10 2004-01-06 Procédé pour optimiser la luminosité dans un dispositif d' affichage et dispositif pour la mise en oeuvre de ce procédé Withdrawn EP1437706A3 (fr)

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EP04290015A EP1437706A3 (fr) 2003-01-10 2004-01-06 Procédé pour optimiser la luminosité dans un dispositif d' affichage et dispositif pour la mise en oeuvre de ce procédé

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EP20030290062 EP1437705A1 (fr) 2003-01-10 2003-01-10 Procédé pour optimiser la luminosité dans un dispositif d' affichage et dispositif pour la mise en oeuvre de ce procédé
EP03290062 2003-01-10
EP04290015A EP1437706A3 (fr) 2003-01-10 2004-01-06 Procédé pour optimiser la luminosité dans un dispositif d' affichage et dispositif pour la mise en oeuvre de ce procédé

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1526500A2 (fr) * 2003-10-21 2005-04-27 Lg Electronics Inc. Procédé et dispositif pour réduction de rémanence d'image sur un dispositif d'affichage à plasma
EP1785973A1 (fr) * 2005-11-10 2007-05-16 Deutsche Thomson-Brandt Gmbh Procédé et appareil pour le contrôle du niveau de puissance dans un dispositif d'affichage
EP1798713A1 (fr) * 2005-11-10 2007-06-20 Thomson Licensing Procédé et dispositif pour le contrôle du niveau de puissance dans un dispositif d'affichage
EP2065875A1 (fr) * 2007-11-27 2009-06-03 Samsung SDI Co., Ltd. Dispositif électroluminescent, procédé de commande de ce dernier et dispositif d'affichage l'utilisant
CN102522061A (zh) * 2011-12-29 2012-06-27 四川虹欧显示器件有限公司 显示器的图像处理方法和装置

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US5329288A (en) * 1991-09-28 1994-07-12 Samsung Electron Devices Co., Ltd. Flat-panel display device
EP0674303A2 (fr) * 1990-11-28 1995-09-27 Fujitsu Limited Circuit pour commander avec des gradations un dispositif d'affichage à panneau plat
US5745085A (en) * 1993-12-06 1998-04-28 Fujitsu Limited Display panel and driving method for display panel
WO2002011111A2 (fr) * 2000-07-28 2002-02-07 Thomson Licensing S.A. Procede et appareil de commande de niveau d'intensite d'un dispositif d'affichage
US6388678B1 (en) * 1997-12-10 2002-05-14 Matsushita Electric Industrial Co., Ltd. Plasma display panel drive pulse controller
US20020140636A1 (en) * 2000-12-20 2002-10-03 Holtslag Antonius Hendricus Maria Matrix display device and method
US6496165B1 (en) * 1999-07-01 2002-12-17 Pioneer Corporation Driving apparatus for driving a plasma display panel based on power consumed during a non-light emitting period of a unit display period

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0674303A2 (fr) * 1990-11-28 1995-09-27 Fujitsu Limited Circuit pour commander avec des gradations un dispositif d'affichage à panneau plat
US5329288A (en) * 1991-09-28 1994-07-12 Samsung Electron Devices Co., Ltd. Flat-panel display device
US5745085A (en) * 1993-12-06 1998-04-28 Fujitsu Limited Display panel and driving method for display panel
US6388678B1 (en) * 1997-12-10 2002-05-14 Matsushita Electric Industrial Co., Ltd. Plasma display panel drive pulse controller
US6496165B1 (en) * 1999-07-01 2002-12-17 Pioneer Corporation Driving apparatus for driving a plasma display panel based on power consumed during a non-light emitting period of a unit display period
WO2002011111A2 (fr) * 2000-07-28 2002-02-07 Thomson Licensing S.A. Procede et appareil de commande de niveau d'intensite d'un dispositif d'affichage
US20020140636A1 (en) * 2000-12-20 2002-10-03 Holtslag Antonius Hendricus Maria Matrix display device and method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1526500A2 (fr) * 2003-10-21 2005-04-27 Lg Electronics Inc. Procédé et dispositif pour réduction de rémanence d'image sur un dispositif d'affichage à plasma
EP1526500A3 (fr) * 2003-10-21 2007-02-28 Lg Electronics Inc. Procédé et dispositif pour réduction de rémanence d'image sur un dispositif d'affichage à plasma
EP1785973A1 (fr) * 2005-11-10 2007-05-16 Deutsche Thomson-Brandt Gmbh Procédé et appareil pour le contrôle du niveau de puissance dans un dispositif d'affichage
EP1798713A1 (fr) * 2005-11-10 2007-06-20 Thomson Licensing Procédé et dispositif pour le contrôle du niveau de puissance dans un dispositif d'affichage
CN1963901B (zh) * 2005-11-10 2011-05-18 汤姆森许可贸易公司 用于显示设备中的功率电平控制的方法及装置
US7986316B2 (en) 2005-11-10 2011-07-26 Thomson Licensing Method and apparatus for power level control in a display device
EP2065875A1 (fr) * 2007-11-27 2009-06-03 Samsung SDI Co., Ltd. Dispositif électroluminescent, procédé de commande de ce dernier et dispositif d'affichage l'utilisant
CN102522061A (zh) * 2011-12-29 2012-06-27 四川虹欧显示器件有限公司 显示器的图像处理方法和装置

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