EP1255239A1 - Ausgleichsverfahren zur Verbesserung der Bildqualität einer Plasmaanzeigetafel - Google Patents

Ausgleichsverfahren zur Verbesserung der Bildqualität einer Plasmaanzeigetafel Download PDF

Info

Publication number
EP1255239A1
EP1255239A1 EP01110882A EP01110882A EP1255239A1 EP 1255239 A1 EP1255239 A1 EP 1255239A1 EP 01110882 A EP01110882 A EP 01110882A EP 01110882 A EP01110882 A EP 01110882A EP 1255239 A1 EP1255239 A1 EP 1255239A1
Authority
EP
European Patent Office
Prior art keywords
pdp
green
red
light
discharge cells
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Withdrawn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
EP01110882A
Other languages
English (en)
French (fr)
Inventor
Shiuh-Bin Kao
Yi-Sheng Yu
Kuang-Lang Chen
Ching-Hui Lin
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.)
Chunghwa Picture Tubes Ltd
Original Assignee
Chunghwa Picture Tubes Ltd
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 Chunghwa Picture Tubes Ltd filed Critical Chunghwa Picture Tubes Ltd
Priority to EP01110882A priority Critical patent/EP1255239A1/de
Publication of EP1255239A1 publication Critical patent/EP1255239A1/de
Withdrawn legal-status Critical Current

Links

Images

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
    • G09G3/2003—Display of colours
    • 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
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • 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
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • 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
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/08—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using incandescent filaments
    • 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

Definitions

  • the present invention relates to plasma display panels and more particularly to a compensation method for improving color saturation and image quality of plasma display panel by adjusting the strength of input image signals.
  • FIG. 1 A manufacturing process of a conventional alternating current discharge type plasma display panel (PDP) 10 is shown in FIG. 1.
  • PDP alternating current discharge type plasma display panel
  • two different activation layers are formed on glass substrates 11 and 12 respectively.
  • a mixed gas consisting of helium (He), neon (Ne), and xenon (Xe) (or argon (Ar)) having a predetermined mixing volume ratio is stored in a discharge space formed in between the glass substrates 11 and 12.
  • a front plate 11 is defined as one of the glass substrates 11 and 12that facing viewers.
  • a plurality of parallel spaced transparent electrodes 111, a plurality of parallel spaced bus electrodes 112, a dielectric layer 113, and a protection layer 114 are formed from the front plate 11 inwardly.
  • a plurality of parallel spaced data electrodes 121, a dielectric layer 124, a plurality of parallel spaced ribs 122, and a uniform phosphor layer 123 are formed from rear plate 12 inwardly.
  • dielectric layers 113 and 124 will discharge in discharge cell 13 formed by adjacent spaced ribs 122.
  • a ray having a desired color is emitted from phosphor layer 123.
  • NEC Japanese Industrial Standard Determination Tube
  • a filter 20 on front plate 11 is formed on each of corresponding red, green, and blue discharge cells 13 as shown in FIG. 2.
  • the manufacturing cost is increased significantly because the manufacturing process of filters 20 is complex.
  • Plasmaco is proposed by Plasmaco (Japan) in which circular polarizing filters are used for eliminating the adverse influence of bright environment.
  • the brightness of PDP may be adversely affected since the transmissibility of such circular polarizing filters is low. Thus, such technique is undesirable.
  • environment light modes e.g., strong light mode, room light mode, exhibition light mode, etc.
  • an image shown on a well known PDP consists of a plurality of pixels. Note that the number of pixels is determined by the resolution of PDP.
  • a pixel consists of three discharge cells capable of emitting red, green, and blue lights respectively.
  • the color of a pixel of image shown on PDP is a mixture of red, green and blue lights emitted by respective discharge cell.
  • a, b, and c are gray scales of red, green and blue lights emitted by respective discharge cell of each pixel of PDP.
  • R cell , G cell , and B cell are brightness of respective gray scale in phosphor layer of discharge cells corresponding to each pixel.
  • One aspect of the invention is to eliminate the adverse effect of such visible light W on color saturation and image quality of PDP.
  • the invention utilizes the control circuit of PDP for increasing or decreasing the strength of input image signals (or input voltage) of each discharge cell to exclude the effect of the additional visible light W from the color generated by red, green and blue discharge cells while showing image on PDP. As a result, the adverse effect of the visible light W on PDP is completely eliminated, thereby improving the color saturation and image quality of PDP.
  • the additional visible light W on PDP generated by environment light may be prepared by a predetermined mixing ratio of red, green and blue lights.
  • the visible light W diffused from PDP may be expressed by above equation (5).
  • the Image Bright observed in the bright environment is expressed by equation (6) below which is an addition of equations (4) and (5): wherein ⁇ R cell + ⁇ G cell + ⁇ B cell is the adverse effect of the additional visible light W on PDP, i.e. the main factor of the degradation of color saturation and image quality of PDP.
  • the gray scale of respective color of input image e.g., red gray scale is a, green gray scale is b, or blue gray scale is c
  • the invention can activate the control circuit to perform an operation on each of above equations (7) to (9), thereby adjusting the strength of input image signals of each discharge cell.
  • first 128 gray scales of respective color of input image are sampled and the threshold value of respective color is set as 20.
  • a compensation on color saturation of PDP is performed by the invention. It is apparent that in the low gray scale region, the negative values of equations (7) to (9) are avoided. Most importantly, the adverse effect of the bright environment light on PDP is completely eliminated.
  • the brightness of pixel after compensation may be expressed by equation (11) below:
  • Adjust the strength of input image signals of respective discharge cell based on the ratio between gray scale of each color of input image and default threshold gray scale. As a result, the negative values are avoided. Further, the adverse effect of the bright environment light on PDP is completely eliminated.
  • FIG. 5 there is shown a second embodiment of the invention wherein an active compensation on color saturation is performed in a bright environment.
  • a light sensor is used to detect environment light.
  • the detected values are processed in order to evaluate the effect of environment light on PDP.
  • a compensation on color saturation of PDP may be performed accordingly.
  • FIG. 6 there is shown a third embodiment of the invention wherein an inactive compensation on color saturation is performed in a bright environment.
  • a number of environment light modes e.g., strong light mode, room light mode, exhibition light mode, etc.
  • control circuit of PDP is activated.
  • user may select an appropriate light mode depending on the real environment of PDP.
  • a compensation on color saturation of PDP may be performed accordingly.
  • the invention can adjust the brightness of the generated red, green, or blue light by increasing or decreasing the strength of input image signals of respective discharge cell of each pixel.
  • the adverse effect of environment light on color saturation of PDP is completely eliminated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP01110882A 2001-05-04 2001-05-04 Ausgleichsverfahren zur Verbesserung der Bildqualität einer Plasmaanzeigetafel Withdrawn EP1255239A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01110882A EP1255239A1 (de) 2001-05-04 2001-05-04 Ausgleichsverfahren zur Verbesserung der Bildqualität einer Plasmaanzeigetafel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01110882A EP1255239A1 (de) 2001-05-04 2001-05-04 Ausgleichsverfahren zur Verbesserung der Bildqualität einer Plasmaanzeigetafel

Publications (1)

Publication Number Publication Date
EP1255239A1 true EP1255239A1 (de) 2002-11-06

Family

ID=8177326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01110882A Withdrawn EP1255239A1 (de) 2001-05-04 2001-05-04 Ausgleichsverfahren zur Verbesserung der Bildqualität einer Plasmaanzeigetafel

Country Status (1)

Country Link
EP (1) EP1255239A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108230408A (zh) * 2018-01-18 2018-06-29 华中科技大学 一种日光环境下基于可见光图像诊断沿面放电的方法
CN112885310A (zh) * 2021-01-25 2021-06-01 北京欧铼德微电子技术有限公司 驱动方法、装置及电子设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999030308A1 (en) * 1997-12-10 1999-06-17 Matsushita Electric Industrial Co., Ltd. Plasma display panel drive pulse controller
US6094185A (en) * 1995-07-05 2000-07-25 Sun Microsystems, Inc. Apparatus and method for automatically adjusting computer display parameters in response to ambient light and user preferences

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6094185A (en) * 1995-07-05 2000-07-25 Sun Microsystems, Inc. Apparatus and method for automatically adjusting computer display parameters in response to ambient light and user preferences
WO1999030308A1 (en) * 1997-12-10 1999-06-17 Matsushita Electric Industrial Co., Ltd. Plasma display panel drive pulse controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108230408A (zh) * 2018-01-18 2018-06-29 华中科技大学 一种日光环境下基于可见光图像诊断沿面放电的方法
CN112885310A (zh) * 2021-01-25 2021-06-01 北京欧铼德微电子技术有限公司 驱动方法、装置及电子设备

Similar Documents

Publication Publication Date Title
US7397497B2 (en) Display device capable of reducing burn-in on display panel
US7649510B2 (en) Plasma display apparatus and image processing method thereof
US20020167467A1 (en) Compensation method for improving color saturation and image quality of plasma display panel by adjusting the strength of input image signals
JP4084262B2 (ja) 輝度補正回路、輝度補正方法及び映像表示装置並びに映像表示方法
US7692607B2 (en) Apparatus and method for adjusting image on the basis of characteristics of display system
US7515119B2 (en) Method and apparatus for calculating an average picture level and plasma display using the same
US20040080517A1 (en) Driving method and apparatus of plasma display panel
US7609283B2 (en) Plasma display apparatus and image processing method thereof
EP1255239A1 (de) Ausgleichsverfahren zur Verbesserung der Bildqualität einer Plasmaanzeigetafel
US6441563B1 (en) Dynamic color temperature and color deviation calibration method
KR100809405B1 (ko) 입력 이미지 신호의 세기를 조정함에 의하여 플라즈마표시판의 색채도와 이미지 질을 향상시키는 보상방법
US20050232508A1 (en) Plasma display apparatus and image processing method thereof
EP1258858A1 (de) Dynamisches Farbeichungsverfahren
KR100830465B1 (ko) 영상 디스플레이 장치의 화이트 밸런스 조정 방법 및 장치
US6630918B2 (en) Compensation method for improving color purity and color temperature of plasma display panel by adjusting the strength of input image signals
JP2760295B2 (ja) ディスプレイ装置の誤差拡散処理装置
KR100743202B1 (ko) 입력 비디오 신호 세기의 동적 조정에 의한 플라즈마 판표시의 유효수명 연장방법
EP1258857A1 (de) Verfahren zur Kompensierung von Alterungseffekten einer Plasma-Anzeigetafel
EP1255238A1 (de) Verfahren zur Verbesserung der Farbeneinheit und Farbtemperatur einer Plasmaanzeigetafel
KR100667555B1 (ko) 플라즈마 디스플레이 패널의 화상처리 방법
US5977711A (en) Method and system for optimizing cathode output for aging a cathode ray tube during manufacture
JP2820037B2 (ja) ディスプレイ装置の誤差拡散回路
JP3346107B2 (ja) 誤差拡散処理回路
KR100546621B1 (ko) 기준 백색 보정 장치를 구비한 평판 디스플레이 장치 및그의 기준 백색 보정 방법
KR100864912B1 (ko) 동적인 색온도 및 색편차 교정방법

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20030307

AKX Designation fees paid

Designated state(s): DE FR GB IT NL

17Q First examination report despatched

Effective date: 20071122

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20120329