EP1821277A2 - Procédé de commande d'un panneau d'affichage à plasma avec estimation et compensation de l'atténuation, et appareil correspondant - Google Patents

Procédé de commande d'un panneau d'affichage à plasma avec estimation et compensation de l'atténuation, et appareil correspondant Download PDF

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Publication number
EP1821277A2
EP1821277A2 EP07102607A EP07102607A EP1821277A2 EP 1821277 A2 EP1821277 A2 EP 1821277A2 EP 07102607 A EP07102607 A EP 07102607A EP 07102607 A EP07102607 A EP 07102607A EP 1821277 A2 EP1821277 A2 EP 1821277A2
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EP
European Patent Office
Prior art keywords
attenuation
video
information
input data
power level
Prior art date
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Withdrawn
Application number
EP07102607A
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German (de)
English (en)
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EP1821277A3 (fr
Inventor
Cédric Thebault
Carlos Correa
Sébastien Weitbruch
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THOMSON LICENSING
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Thomson Licensing SAS
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Filing date
Publication date
Priority claimed from EP06290293A external-priority patent/EP1821275A1/fr
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Priority to EP07102607A priority Critical patent/EP1821277A3/fr
Publication of EP1821277A2 publication Critical patent/EP1821277A2/fr
Publication of EP1821277A3 publication Critical patent/EP1821277A3/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Withdrawn legal-status Critical Current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
    • G09G3/2803—Display of gradations
    • 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
    • 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
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G09G2330/045—Protection against panel overheating
    • 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 driving a plasma display panel by providing video data, adjusting the gain and/or the offset of the video data, processing the video data on the basis of power level information and controlling the plasma display panel respectively. Furthermore, the present invention relates to a corresponding apparatus for driving a display panel.
  • a PDP plasma display panel
  • a PDP controls the gray level by modulating the number of light pulses per frame (sustain pulses). This time-modulation will be integrated by the eye over a period corresponding to the eye time response. Since the video amplitude is portrayed by the number of light pulses, occurring at a given frequency, more amplitude means more light pulses and thus more "ON" time. For this reason, this kind of modulation is also known as PWM, pulse width modulation.
  • the number of real gray levels is limited.
  • the number of gray levels is more or less equal to 256.
  • the problem is that the picture quality is affected when the number of displayed levels is reduced.
  • Contrast and brightness controls are usually part of the so called “front-end”, while PDP specific functions (gamma function, Sub-field encoding, etc) are part of the so called “back-end” of the display (see Fig. 3).
  • APL Average Power Level
  • the aim of power management is to keep the power consumption constant (see Fig. 1) and to have a peak luminance as high as possible. So for every APL value, the maximal number of sustain pulses to be used is fixed. This number of sustain pulses decreases when the APL increases, and vice versa as shown in Fig. 2.
  • the following table shows an allocation of the values of the number of sustain pulses to the average power levels according to Fig. 2.
  • APL Total Number of sustain pulses 0 1000 1 1000 2 1000 3 1000 4 1000 5 1000 . . . 50 1000 51 1000 52 1000 53 1000 54 1000 55 1000 56 999 57 998 58 996 59 994 60 991 61 988 62 984 63 979 64 975 65 971 66 966 67 962 68 958 69 954 70 950 71 946 72 942 73 938 74 933 75 929 . . . 295 449 296 448 297 447 298 446 299 445 300 444 301 442 302 441 303 440 304 439 305 438 . .
  • the problem of the standard implementation of power management is that when the energy of the input picture of the back-end decreases, the number of sustain pulses increases. So the energy of the displayed picture decreases hardly.
  • Fig. 3 shows a principle block diagram of the driving unit of a plasma panel 1.
  • the video input signal is first processed in the front-end 2.
  • the front-end includes a scaling unit 4 for adapting the size of the picture to that of the panel.
  • the scaled input signal is supplied to a brightness/contrast control block 5.
  • the video signal is processed accordingly and supplied to the back-end 3.
  • the signal is processed in a usual path including a gamma block 6, a dithering block 7 and an encoding block 8.
  • the gamma block 6 performs a data transformation with a look up table in accordance to a nearly quadratic gamma function.
  • the output signal of the gamma block 6 is transmitted to the dithering unit 7 which will add for example 4 bit dithering in order to render more discrete video levels at the output.
  • the sub field encoding 8 generates sub field data for the video signal. The resulting sub field data are sent to the plasma panel 1.
  • the output signal of the front-end 2 is input into an APL measurement block 10.
  • This block supplies an APL level of the brightness/contrast tuned video signal to the power management 9.
  • the power management 9 controls the gamma unit 6 and the encoding unit 8. Furthermore, the power management 9 delivers sustain information to the plasma panel 1.
  • the APL (measured in the back-end 3) is decreasing; this means that the number of sustain pulses is increasing. This increases partly the contrast.
  • the picture is divided by more than 4, the number of gray levels really used is also divided by around 4. The picture quality is rather low in this case.
  • this object is solved by a method for driving a plasma display panel by providing video input data, providing attenuation information, adjusting the gain and/or the offset of the video input data in order to obtain adjusted video data, measuring a power level of said adjusted video data and providing a respective first power level information, generating a second power level information on the basis of said first power level information and said attenuation information, changing the level of said adjusted input data on the basis of the attenuation information and obtaining respective changed video data, adjusting the number of sustain pulses per sub-field on the basis of said second power level information and, driving said plasma display panel with said adjusted number of sustain pulses and said changed video data.
  • an apparatus for driving a plasma display panel including brightness/contrast control means for receiving video input data, for adjusting the gain and/or the offset of the video input data and for outputting adjusted video data, attenuation data means for providing attenuation information, power measurement means for measuring a power level of said adjusted video data and providing a respective first power level information, power level generating means for generating a second power level information on the basis of said first power level information and said attenuation information, compensating means for changing the level of said adjusted input data of said brightness/contrast control means on the basis of the attenuation information and for outputting respective changed video data, power management means for adjusting the number of sustain pulses per sub-field on the basis of said second power level information and driving said plasma display panel with said adjusted number of sustain pulses and said changed video data.
  • the attenuation information directly depends on the adjustment of the gain and/or the offset of the video input data.
  • attenuation evaluation means are not necessary in the back-end, since the attenuation information is directly produced in the front-end by the brightness/contrast control means for example.
  • the attenuation information may be evaluated during the step of adjusting the gain and/or the offset of the video input data, whereby the video input data are pre-given maximum input data.
  • the implementation of the system would be simplified.
  • the attenuation information may be evaluated during a blanking time between video frames.
  • the blanking time can be used for adjusting the power management in the back-end.
  • component attenuation information may be evaluated for the red, green and blue components of the adjusted video data and the component attenuation information corresponding to the less attenuated component is used as the attenuation information. Such differentiation of the components leads to an improved colour rendition.
  • the attenuation information is evaluated for each frame of the video input data. This guarantees a dynamic improvement for each picture.
  • the purpose of the invention presented here is to improve the behavior of the power management 9 (cf. Fig. 3) regarding contrast and brightness control.
  • the power management should not increase the number of sustain pulses. Otherwise, the user needs to further decrease the contrast and/or the brightness, thereby further reducing the picture quality.
  • the total number of sustain pulses should preferably decrease.
  • an attenuation evaluation generator 11 For evaluating an attenuation value, an attenuation evaluation generator 11 is connected in front of the brightness/contrast control block 5 as shown in Figure 4.
  • the attenuation evaluation generator 11 inputs into block 5 maximum video input data as reference data, on the basis of which the attenuation shall be evaluated.
  • an attenuation evaluation unit 12 calculates the attenuation of the maximum input data tuned by the brightness/contrast control means 5.
  • a respective attenuation factor or attenuation information is provided for a power level generating block 13 which provides an adapted power level information APL Att for the power management unit 9.
  • This adapted power level information APL Att is generated on the basis of the attenuation information of block 12 and the power level measured by the power level measurement block 10 of the back-end 3. Furthermore, a modified attenuation information Att' is input to a compensation unit 14, which processes the video data of the brightness/contrast control means 5 of the front-end 2 and outputs compensated video data having increased dynamic to the gamma block 6. In the following, the function of the circuit of Figure 4 is explained in more detail.
  • the front-end 2 includes the attenuation evaluation generator 11 in order to be able to deliver an output value for an input value corresponding to the maximum input value (1023 for R, G and B in case of 10 bit signal). These values (R Att , G Att , B Att ) should be evaluated during the blanking time.
  • the same compensation 13 will be applied to the three components R, G, B. So in order to have no saturation, the coefficient, which will be used for the compensation will correspond to the less attenuated component. This means that only the less attenuated component will be fully compensated.
  • the back-end 3 will only use the maximum of the values (R Att , G Att , B Att ) to determine the value of the compensation to apply. This maximum value has to be evaluated for each frame since the contrast and/or the brightness can change at any time.
  • the video level has to be increased to compensate the reduction of the total number of sustain pulses. This can be done:
  • the content of the front-end 2 and the back-end 3 of the example of Figure 4 are only given as examples. It is only mandatory in the front-end 2 to have the "Attenuation Evaluation Generator" function 11 before the brightness/contrast control 5. Of course also another function that could increase or decrease the video level can be used.
  • the "Attenuation Evaluation Generator” 11 should give as input to the front-end 2 the maximum value for R, G and B. Then, the "Attenuation Evaluation” 12 should read the output values of the front-end 2 during this time. During the remaining time of the frame, the "Attenuation Evaluation Generator” 11 should have a bypass function.
  • the "Attenuation Evaluation" 12 should evaluate the less attenuated value (Att) by computing the maximum of these three values (R Att , G Att , B Att ).
  • These two LUTs have the same inputs (Att and APL B ) and the same size: 1024*1024*10bit, if each value uses 10 bits. These values are only read once per frame, and so the LUTs can typically be stored in the external memory.
  • APL Att will be used by the Power Management 9 to choose the correct sustain information sent to the PDP, and to load the corresponding LUTs in the Gamma 6 and Decoding blocks.
  • the value Att' is used by the Compensation Video Block 14.
  • This block 14 can be defined:
  • This sub-part of the comp_video LUT which has a maximum size of 1024*10bit, has to be loaded in the IC for each frame.
  • This solution does not change the brightness on the PDP. In fact it decreases the total number of sustain pulses but it increases in the same ratio the video values R, G, B. On the PDP there will be used as many sustain pulses as before, only the number of unused sustain pulses will be smaller. This means that, advantageously, the power consumption will be reduced in this case.
  • Att' 528.
  • a LUT or just a coefficient has to be loaded in the IC in order to proceed to the multiplication.
  • This LUT is loaded only once per frame, and is used for every pixel of the picture. The LUT will multiply the video data by 4.3 ⁇ , so that the video will be able to use the full dynamic of the PDP.
  • the power management unit 9 uses the value 605 as input.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)
EP07102607A 2006-02-20 2007-02-19 Procédé de commande d'un panneau d'affichage à plasma avec estimation et compensation de l'atténuation, et appareil correspondant Withdrawn EP1821277A3 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07102607A EP1821277A3 (fr) 2006-02-20 2007-02-19 Procédé de commande d'un panneau d'affichage à plasma avec estimation et compensation de l'atténuation, et appareil correspondant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06290293A EP1821275A1 (fr) 2006-02-20 2006-02-20 Appareil et Méthode de pilotage d'un panneau d'affichage plasma avec estimation de l'atténuation et compensation correspondante.
EP07102607A EP1821277A3 (fr) 2006-02-20 2007-02-19 Procédé de commande d'un panneau d'affichage à plasma avec estimation et compensation de l'atténuation, et appareil correspondant

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EP1821277A2 true EP1821277A2 (fr) 2007-08-22
EP1821277A3 EP1821277A3 (fr) 2010-02-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8522059B2 (en) 2009-11-24 2013-08-27 Hewlett-Packard Development Company, L.P. Display panel power prediction

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1139322A2 (fr) * 2000-03-30 2001-10-04 Fujitsu Hitachi Plasma Display Limited Procédé de commande d'un panneau d'affichage et panneau d'affichage
EP1347434A1 (fr) * 2002-03-18 2003-09-24 Koninklijke Philips Electronics N.V. Commande du contraste et de la brillance d'un dispositif d'affichage
US20040004610A1 (en) * 2002-06-27 2004-01-08 Pioneer Corporation Display panel driver
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1139322A2 (fr) * 2000-03-30 2001-10-04 Fujitsu Hitachi Plasma Display Limited Procédé de commande d'un panneau d'affichage et panneau d'affichage
EP1347434A1 (fr) * 2002-03-18 2003-09-24 Koninklijke Philips Electronics N.V. Commande du contraste et de la brillance d'un dispositif d'affichage
US20040004610A1 (en) * 2002-06-27 2004-01-08 Pioneer Corporation Display panel driver
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8522059B2 (en) 2009-11-24 2013-08-27 Hewlett-Packard Development Company, L.P. Display panel power prediction

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