EP1544838A1 - Méthode et dispositif pour réduire les effets des différences de charge des sous trames - Google Patents

Méthode et dispositif pour réduire les effets des différences de charge des sous trames Download PDF

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Publication number
EP1544838A1
EP1544838A1 EP03293195A EP03293195A EP1544838A1 EP 1544838 A1 EP1544838 A1 EP 1544838A1 EP 03293195 A EP03293195 A EP 03293195A EP 03293195 A EP03293195 A EP 03293195A EP 1544838 A1 EP1544838 A1 EP 1544838A1
Authority
EP
European Patent Office
Prior art keywords
sustain pulses
subfield
load
loads
luminance
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Withdrawn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
EP03293195A
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German (de)
English (en)
Inventor
Sébastien Weitbruch
Cédric Thebault
Carlos Correa
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.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
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 Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Priority to EP03293195A priority Critical patent/EP1544838A1/fr
Priority to JP2006544426A priority patent/JP5128818B2/ja
Priority to KR1020067010004A priority patent/KR101021861B1/ko
Priority to PCT/EP2004/053440 priority patent/WO2005059879A1/fr
Priority to EP04804800A priority patent/EP1695328B1/fr
Priority to DE602004015148T priority patent/DE602004015148D1/de
Priority to US10/583,533 priority patent/US8441415B2/en
Priority to TW093139250A priority patent/TW200532618A/zh
Publication of EP1544838A1 publication Critical patent/EP1544838A1/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Withdrawn legal-status Critical Current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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2044—Display of intermediate tones using dithering
    • G09G3/2051—Display of intermediate tones using dithering with use of a spatial dither pattern
    • 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
    • G09G3/2029—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having non-binary weights
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • 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 present invention relates to a method for processing data of a picture to be displayed on display means with persistent luminous elements during a frame comprising a plurality of subfields of at least two different weights.
  • High contrast is an essential factor for evaluating the picture quality of every display technologies. From this perspective, a high peak-white luminance is always required to achieve a good contrast ratio and, as a result, a good picture performance even with ambient light conditions. Otherwise, the success of a new display technology requires also a well-balanced power consumption. For every kind of active display, more peak luminance corresponds also to a higher power that flows in the electronic of the display. Therefore, if no specific management is done, the enhancement of the peak luminance for a given electronic efficacy will lead to an increase of the power consumption. So, it is common to use a power management concept to stabilize the power consumption of the display.
  • figure 1 enables to avoid any overloading of the power supply as well as a maximum contrast for a given picture.
  • the power management is based on a so called ABM function (Average Beam-current Limiter), which is implemented by analog means, and which decreases video gain as a function of average luminance, usually measured over a RC stage.
  • ABM function Average Beam-current Limiter
  • the luminance as well as the power consumption is directly linked to the number of sustain pulses (light pulses) per frame. As shown on Figure 2, the number of sustain pulses for peak white decreases as the picture load, which corresponds to the Average Power Level (APL) of the picture, increases for keeping constant the power consumption.
  • APL Average Power Level
  • APL Average Power Level
  • a maximal number of sustain pulses is fixed for the peak white pixels for keeping constant the power consumption of the PDP. Since, only an integer number of sustain pulses can be used, there is only a limited number of available APL values. In theory, the number of sustain pulses that can be displayed for the peak white pixels can be very high. Indeed, if the picture load tends to zero, the power consumption tends also to zero, and the maximal number of sustain pulses for a constant power consumption tends to infinite. However, the maximal number of sustain pulses defining the maximal peak white (peak white for a picture load of 0%) is limited by the available time in a frame for the sustaining and by the minimum duration of a sustain pulse.
  • Figure 3 illustrates the duration and the content of a frame comprising 12 subfields having different weights, each subfield comprising an addressing period for activating the cells of the panel and a sustaining period for illuminating the activated cells of the panel.
  • the duration of the addressing period is identical for each subfield and the duration of the sustaining period is proportional to the weight of the subfield.
  • the number of subfield is kept to a minimum ensuring an acceptable grayscale portrayal (with few false contour effects), the addressing speed is increased to a maximum keeping an acceptable panel behavior (response fidelity) and the sustain pulse duration is kept to a minimum but having an acceptable efficacy.
  • the load distribution for all subfields of two test pictures given at figure 6 are analyzed below.
  • the first test picture represents a woman with flowers and the second one is a European man.
  • the load of a subfield is the amount (or number) of activated cells of the panel during said subfield.
  • the subfield load is expressed as a percentage of the total amount of cells of the panel. For example, the percentage of 76,05% for the first subfield means that the first subfield is activated for 76,05% of the pixels of the first test picture.
  • the subfield loads are depending on the picture to be displayed.
  • the invention relates to a method and a device for compensating such a load effect in a display panel with persistent luminous elements.
  • the invention concerns a method for processing data of a picture to be displayed on display means with persistent luminous elements during a frame comprising a plurality of subfields of at least two different weights, a number of sustain pulses being associated to each subfield. It comprises the following steps :
  • the method For adjusting the number of sustain pulses of a subfield, the method comprises the following steps :
  • the correction values of the subfields are defined by a look up table with the load and the number of sustain pulses of the subfields as input signals.
  • the correction values stored in the look up table can be achieved in at least two different ways.
  • the corrections values are computed by :
  • the correction values included in the look up table are achieved by the following steps :
  • the inventive method comprises further a step for rescaling the second numbers of sustain pulses of the plurality of subfields in order to redistribute in each subfield an amount of the subtracted sustain pulses proportionally to its second number of sustain pulses.
  • said number of sustain pulses is rescaled in order that the average power level needed by the display means for displaying the picture be approximately equal to a fixed target value.
  • the invention concerns also a device for processing data of a picture to be displayed on display means with persistent luminous elements during a frame comprising a plurality of subfields of at least two different weights, a number of sustain pulses being associated to each subfield, characterized in that it comprises :
  • the invention concerns also a plasma display panel comprising a plurality of persistent luminous elements organized in rows and columns and said device for compensating load effect.
  • the number of sustain pulses of each subfield is adjusted to compensate the load effect.
  • a correction value is calculated for each subfield. This value, depending on the load and the number of sustain pulses of the subfield, is subtracted to the number of sustain pulses of the subfield.
  • the subtracted sustain pulses are redistributed to the subfields proportionally to their new amount of sustain pulses in order to avoid a loss of luminance (a reduced peak luminance).
  • the adjusting step is implemented after the computation of the picture load, for example by calculating the Average Power Level (APL), and after the rescaling of the number of sustain pulses of each subfield in order to keep constant the power consumption of the display panel.
  • APL Average Power Level
  • each video data are encoded into 11 bit data (1 bit for each subfield) and the 11 subfields have the following weights :
  • the numbers of sustain pulses of the subfields are rescaled, for example by APL as shown in FIG.3, in order to keep constant the power consumption.
  • the maximal peak white can vary from 200 sustain pulses up to 1080 sustain pulses.
  • This step consists in counting the luminous elements that are to be illuminated during each subfield for the picture to be displayed.
  • This step can be easily implemented by using, for each subfield, a counter counting the subfield data corresponding to luminous elements "ON".
  • This step leads in the definition of a number of sustain pulses for each subfield minimizing the load effect.
  • the measurement is for example carried out on a square area of the screen.
  • the picture load is made evolving from, for example, 8.5% up to 100%.
  • the gray levels in this area are coded with only one subfield having successively all sustain pulses numbers of the subset.
  • An example of measurement results is presented on the table below for only some measuring points (from 1 sustain pulse to 130 sustain pulses with load varying from 8.5% to 100%).
  • the luminance behavior results are expressed in candela per square meter (cd/m 2 ).
  • the load is given vertically in the left column of the table and the number of sustain pulses is given horizontally in the top row of the table. This table comprises a reduced amount of values to simplify the exposition of the invention.
  • the luminance efficacy can be computed for each number of sustain pulses and load to provide the efficacy of each subfield compared with the luminance for the lowest non-zero load (8,5% in the present case).
  • the efficacy results are given in the table below the values of load and sustain pulses number of the previous table. In this table, the efficacy of 100% is allocated to the values obtained for a load of 8.5%.
  • the minimal efficacy (66.29%) is obtained for a load of 100%. It corresponds to a luminance attenuation of 33.71%.
  • the invention proposes to adjust the number of sustain pulses per subfield to get an efficacy of 66.29% for each subfield. For example, for a subfield that should have 107 sustain pulses after rescaling by APL:
  • the luminance attenuation does not vary much with the number of sustain pulses, it is possible, for achieving the correction values, to measure the luminance produced by a plurality of luminous elements of the display panel for only a specific number of sustain pulses and for all the precited loads. A value of the luminance attenuation compared with a reference luminance measured for the highest one of said loads is then determined for each one of said loads. A correction value can be then computed, for each one of said loads and for said specific first number of sustain pulses, by multiplying the determined luminance attenuation with said specific first number of sustain pulses.
  • the subfields are corrected to deliver a maximum of 66.29% of luminance. Consequently, the maximal peak luminance of the display is reduced.
  • the redistribution of the subtracted sustain pulses can be illustrated by the following equation : where NB 3 (SFn) is the number of sustain pulses of the subfield SFn after redistribution of the subtracted sustain pulses.
  • Figure 8 illustrates a possible circuit implementation of the inventive method.
  • the input data comprise 10 bits in our example whereas the output data have 16 bits.
  • the output data are summed up by an Average Power Measure Block 12 to deliver an Average Power Level (APL) as described previously.
  • a first number of sustain pulses NB 1 (SFn) is determining for each subfield SFn by a Power management LUT 13 receiving the APL value in order that the average power needed by the PDP for displaying the picture be approximately equal to a predetermined target value.
  • the output data from the degamma block 10 are in parallel processed by a dithering block 11 to come back to a 8 bits resolution
  • the data outputted by the dithering block 11 are coded in subfield data by an encoding block 14.
  • the subfield data are then stored in a frame memory 15.
  • the amount of active pixel Load(SFn) for each subfield SFn is computed by a load subfield block 16.
  • a correction LUT 17 defines the correction value Corr(SFn,Load(SFn)) to be subtracted to the number of sustain pulses NB 1 (SFn).
  • Another block 18 is used to achieve the following operation NB 1 (SFn)-Corr(SFn,Load(SFn)).
  • the new number of sustain pulses of the subfield SFn is referenced NB 2 (SFn).
  • a block 19 is then used for redistributing the subtracted sustain pulses in all the subfields proportionally to their number of sustain pulses NB 2 (SFn) and achieves the following operation :
  • the numbers of sustain pulses are computed and used to control the PDP to display the subfield data stored in the frame memory 15 and converted in series.
  • the load effect compensation concept of the present invention is based on a LUT 17 having two inputs: the number of sustain pulses and the subfield load. It delivers the amount of sustain pulses that should be subtracted to the number of sustain pulses to obtain the same luminance than a full loaded subfield.
  • a LUT is illustrated by figure 9
  • the number of sustain pulses is going from 1 to 339.
  • the table comprises 339 horizontal inputs.
  • the subfield load should be expressed with 6 bits.
  • the table comprises 64 vertical inputs.
  • the LUT 17 For each number of sustain pulses contained by the current subfield (1 to 339) and for each load of this subfield (measured with a step of 1.5%), the LUT 17 provides the exact amount of sustain pulses that should be subtracted from the original amount of sustain pulses.
  • the utilization of this table requires to compute, for each subfield, its global load (the number of activated luminous elements divided by the total amount of luminous elements).
  • the load subfield block 16 comprises 11 counters (preferably, 16 counters are planned to cover up to 16 subfield modes), one for each bit of the subfield data and each of them being reset at each frame on the V sync pulse. Then, for each pixel, the appropriate subfield counter is incremented by the corresponding bit of the subfield data.
  • Each counter is incremented by the value of the bit of the subfield data (0 if the subfield is not activated for the current video value and 1 if activated). If the three colors are handled serially (one color at a time with the same encoder), 11 counters are sufficient. Otherwise, if the three colors are encoded in parallel with three LUTs, we will have 33 counters.

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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)
EP03293195A 2003-12-17 2003-12-17 Méthode et dispositif pour réduire les effets des différences de charge des sous trames Withdrawn EP1544838A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP03293195A EP1544838A1 (fr) 2003-12-17 2003-12-17 Méthode et dispositif pour réduire les effets des différences de charge des sous trames
JP2006544426A JP5128818B2 (ja) 2003-12-17 2004-12-14 行負荷効果を軽減するための方法および装置
KR1020067010004A KR101021861B1 (ko) 2003-12-17 2004-12-14 화상의 데이터를 처리하기 위한 방법 및 디바이스, 그리고 이러한 디바이스를 포함하는 플라즈마 디스플레이 패널
PCT/EP2004/053440 WO2005059879A1 (fr) 2003-12-17 2004-12-14 Procede et dispositif permettant de reduire l'effet de charge
EP04804800A EP1695328B1 (fr) 2003-12-17 2004-12-14 Procède et dispositif permettant de réduire l'effet de charge sur une ligne
DE602004015148T DE602004015148D1 (de) 2003-12-17 2004-12-14 Verfahren und einrichtung zur verringerung des zeilenlasteffekts
US10/583,533 US8441415B2 (en) 2003-12-17 2004-12-14 Method and device for reducing line load effect
TW093139250A TW200532618A (en) 2003-12-17 2004-12-17 Method and device for reducing load effect

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03293195A EP1544838A1 (fr) 2003-12-17 2003-12-17 Méthode et dispositif pour réduire les effets des différences de charge des sous trames

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EP1544838A1 true EP1544838A1 (fr) 2005-06-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1914706A2 (fr) 2006-10-18 2008-04-23 Samsung Electronics Co., Ltd. Appareil et procédé de commander un dispositif d'affichage auto-émissif
CN106095358A (zh) * 2011-12-06 2016-11-09 杜比实验室特许公司 改进不同显示能力之间基于感知照度非线性的图像数据交换的装置和方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5343215A (en) * 1991-07-29 1994-08-30 Nec Corporation AC refresh type plasma display system uniformly illuminating pixels
EP0653740A2 (fr) * 1993-11-17 1995-05-17 Fujitsu Limited Commande d'échelle de gris pour des dispositifs d'affichage à plasma
EP0841652A1 (fr) * 1996-11-06 1998-05-13 Fujitsu Limited ContrÔle de la consommation de puissance d'une unité d'affichage
US6104362A (en) * 1995-09-01 2000-08-15 Fujitsu Limited Panel display in which the number of sustaining discharge pulses is adjusted according to the quantity of display data, and a driving method for the panel display
EP1345199A2 (fr) * 2002-03-12 2003-09-17 Fujitsu Hitachi Plasma Display Limited Panneau d'affichage au plasma

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5343215A (en) * 1991-07-29 1994-08-30 Nec Corporation AC refresh type plasma display system uniformly illuminating pixels
EP0653740A2 (fr) * 1993-11-17 1995-05-17 Fujitsu Limited Commande d'échelle de gris pour des dispositifs d'affichage à plasma
US6104362A (en) * 1995-09-01 2000-08-15 Fujitsu Limited Panel display in which the number of sustaining discharge pulses is adjusted according to the quantity of display data, and a driving method for the panel display
EP0841652A1 (fr) * 1996-11-06 1998-05-13 Fujitsu Limited ContrÔle de la consommation de puissance d'une unité d'affichage
EP1345199A2 (fr) * 2002-03-12 2003-09-17 Fujitsu Hitachi Plasma Display Limited Panneau d'affichage au plasma

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1914706A2 (fr) 2006-10-18 2008-04-23 Samsung Electronics Co., Ltd. Appareil et procédé de commander un dispositif d'affichage auto-émissif
EP1914706A3 (fr) * 2006-10-18 2009-01-07 Samsung Electronics Co., Ltd. Appareil et procédé de commander un dispositif d'affichage auto-émissif
CN101165757B (zh) * 2006-10-18 2012-03-14 三星电子株式会社 用于驱动自发射显示面板的装置和方法
CN106095358A (zh) * 2011-12-06 2016-11-09 杜比实验室特许公司 改进不同显示能力之间基于感知照度非线性的图像数据交换的装置和方法
CN106095357A (zh) * 2011-12-06 2016-11-09 杜比实验室特许公司 改进不同显示能力之间基于感知照度非线性的图像数据交换的装置和方法
CN106095358B (zh) * 2011-12-06 2019-05-14 杜比实验室特许公司 改进不同显示能力之间基于感知照度非线性的图像数据交换的装置和方法
CN106095357B (zh) * 2011-12-06 2020-02-21 杜比实验室特许公司 改进不同显示能力之间基于感知照度非线性的图像数据交换的装置和方法

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