WO2006105499A1 - Uniformity and brightness correction in oled display - Google Patents

Uniformity and brightness correction in oled display Download PDF

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Publication number
WO2006105499A1
WO2006105499A1 PCT/US2006/012362 US2006012362W WO2006105499A1 WO 2006105499 A1 WO2006105499 A1 WO 2006105499A1 US 2006012362 W US2006012362 W US 2006012362W WO 2006105499 A1 WO2006105499 A1 WO 2006105499A1
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WO
WIPO (PCT)
Prior art keywords
input signal
light
brightness
value
emitting element
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.)
Ceased
Application number
PCT/US2006/012362
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English (en)
French (fr)
Inventor
Ronald Steven Cok
James Hadley Ford
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to JP2008504509A priority Critical patent/JP2008535028A/ja
Publication of WO2006105499A1 publication Critical patent/WO2006105499A1/en
Anticipated expiration legal-status Critical
Ceased 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
    • G09G3/22—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
    • G09G3/30—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 electroluminescent panels
    • G09G3/32—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • 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
    • G09G3/30—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 electroluminescent panels
    • G09G3/32—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • 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
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • G09G2320/0295—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel by monitoring each display pixel
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements

Definitions

  • Figs. 4a-4f are graphs illustrating relationship between signal values and light output.
  • Fig. 6 is a flow diagram according to an embodiment of the present invention.
  • Fig. 7 is a flow diagram according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION
  • a corrected input signal for each pixel may be output 18 to a display for viewing by an observer.
  • the input signal may be converted 14 into a linear space before correcting 16 if the input signal is not in an appropriate linear space for correction and output to a display.
  • the measured brightness values may also be converted 11 into the same linear space. Such conversions may be common to all light emitting elements, or to all light emitting elements of a particular color.
  • This conversion may be a common conversion that is applied to all input signals, and may be based upon a series of measured brightness values and a priori knowledge of the display response to input signals.
  • the address value 32 (representing the location of a light emitting element in the display 24) is applied to a look-up table 26 having a single entry for each light emitting element location.
  • a single, multi-bit integrated circuit memory is employed to reduce size and to minimize cost.
  • OLED display 24 may be a color display with color pixels comprising, for example, red, green, and blue subpixels.
  • a set of offset and gain values may be calculated for each sub-pixel, stored in a memory, and employed to correct an input signal, as described above.
  • a single integrated circuit memory having 32 bits (four bytes) of storage at each address location may be employed to provide 32 bits of correction information for each pixel. This storage may be divided in a variety of ways between the offset and gain values for each sub-pixel.
  • this embodiment of the present invention may employ a lookup table of only 60,000 bytes for a 100- by-100-element display.
  • a variety of memories having different numbers of bits per memory address are available commercially. In particular, memories with 8 bits or 32 bits per address location are known.
  • the corrections for each light-emitting element of a color in a color display may be adjusted to control the white point of the display.
  • thin-film transistors are used to drive the pixels. The thin-film transistors often have variable performance, for example, the voltage at which they turn on may vary from transistor to transistor.
  • a light emitting element may emit no light for input signal values greater than zero, hence to provide a smooth gray scale between the minimum and maximum brightness values, the maximum input signal value at which the light-emitting element will not emit any light must be estimated and mapped to the minimum input signal value desired (typically zero).
  • Widely separated brightness measurements may be taken in an automated fashion by employing a measurement device for measuring the brightness of the OLED device in response to the multi -valued input signal and including the steps of selecting the two or more different input signal values by driving at least one light emitting element at a first input signal value and then increasing or decreasing the input signal value until the measured brightness reaches a maximum or minimum measured value, and employing the input signal value corresponding to the maximum or minimum measured value as the larger or smaller of the two-or-more different input signal values.
  • a process such as that shown in Fig. 7 may be employed to find suitable input signal values. Referring to Fig. 7, a maximum brightness value may be obtained by first selecting 100 an arbitrary input signal value.
  • the input signal value is incremented 122 again, the output measured 124 and assigned to B, and the values of A and B are compared again. If the values are the same 116, the input signal value corresponding to A represents the minimum input signal value that will generate the maximum light output and the process is complete 118. If the values are not the same, the value of A is set equal 120 to B again, and the process repeats.
  • the process of finding a minimum brightness value is similar to the process illustrated in Fig. 7, except that rather than incrementing, the input signal value is decremented, and vice versa.
  • Applicants have determined through experimentation that, despite measures taken to reduce the noise in the light output measurements, it can be difficult to consistently and accurately measure the light output from each of the light-emitting elements.
  • a global correction representing the average offset and gain of the device by measuring the output of all, or at least more than one, of the light-emitting elements. This can be done by measuring the overall brightness and gain of the OLED display at one or more input signal values and adjusting the correction based on the measured overall brightness and gain.
  • the correction is preferably done after the individual light- emitting elements have been corrected and the measurement made with as many of the light-emitting elements illuminated as possible.
  • a global correction can be incorporated into each of the individual corrections of the light-emitting elements.
  • the present invention is employed in a flat-panel OLED device composed of small molecule or polymeric OLEDs as disclosed in but not limited to US 4,769,292, issued September 6, 1988 to Tang et al., and US 5,061,569, issued October 29, 1991 to VanSlyke et al.
  • a flat-panel OLED device composed of small molecule or polymeric OLEDs as disclosed in but not limited to US 4,769,292, issued September 6, 1988 to Tang et al., and US 5,061,569, issued October 29, 1991 to VanSlyke et al.
  • Many combinations and variations of organic light-emitting displays can be used to fabricate such a device, including both active- and passive-matrix OLED displays having either a top- or bottom-emitter architecture.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
PCT/US2006/012362 2005-03-29 2006-03-28 Uniformity and brightness correction in oled display Ceased WO2006105499A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008504509A JP2008535028A (ja) 2005-03-29 2006-03-28 Ｏｌｅｄディスプレイにおける一様性と明るさの補正

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/093,115 2005-03-29
US11/093,115 US7301618B2 (en) 2005-03-29 2005-03-29 Method and apparatus for uniformity and brightness correction in an OLED display

Publications (1)

Publication Number Publication Date
WO2006105499A1 true WO2006105499A1 (en) 2006-10-05

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Country Status (3)

Country Link
US (2) US7301618B2 (enExample)
JP (1) JP2008535028A (enExample)
WO (1) WO2006105499A1 (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
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WO2008057316A3 (en) * 2006-11-03 2008-07-24 Eastman Kodak Co Uniformity compensation in an electroluminescent display
WO2009014634A3 (en) * 2007-07-25 2009-04-02 Eastman Kodak Co Display device
JP2016009136A (ja) * 2014-06-25 2016-01-18 株式会社Ｊｏｌｅｄ 表示装置及びその製造方法

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US20060061248A1 (en) * 2004-09-22 2006-03-23 Eastman Kodak Company Uniformity and brightness measurement in OLED displays
US7301618B2 (en) * 2005-03-29 2007-11-27 Eastman Kodak Company Method and apparatus for uniformity and brightness correction in an OLED display
US7639849B2 (en) * 2005-05-17 2009-12-29 Barco N.V. Methods, apparatus, and devices for noise reduction
US8558765B2 (en) * 2005-11-07 2013-10-15 Global Oled Technology Llc Method and apparatus for uniformity and brightness correction in an electroluminescent display
CN101460987A (zh) * 2006-06-06 2009-06-17 Nxp股份有限公司 显示设备以及向其提供照明的方法
CA2556961A1 (en) * 2006-08-15 2008-02-15 Ignis Innovation Inc. Oled compensation technique based on oled capacitance
US8098336B2 (en) * 2006-10-24 2012-01-17 Sony Corporation System and method for using partial interpolation to undertake 3D gamma adjustment of microdisplay having dynamic iris control
TWI466093B (zh) * 2007-06-26 2014-12-21 Apple Inc 用於視訊播放的管理技術
TWI479891B (zh) * 2007-06-26 2015-04-01 Apple Inc 動態背光調適
CN100578179C (zh) * 2007-08-21 2010-01-06 友达光电（苏州）有限公司 测量发光画面亮度均匀性的方法
US8766902B2 (en) * 2007-12-21 2014-07-01 Apple Inc. Management techniques for video playback
KR101510880B1 (ko) * 2008-02-28 2015-04-10 엘지디스플레이 주식회사 데이터 변조 장치, 데이터 변조 방법 및 유기발광표시장치및 그 구동 방법
KR20090120159A (ko) * 2008-05-19 2009-11-24 삼성전자주식회사 영상합성장치 및 영상합성방법
KR20100003459A (ko) * 2008-07-01 2010-01-11 삼성모바일디스플레이주식회사 유기전계 발광 표시장치 및 그 구동방법
JP5304211B2 (ja) * 2008-12-11 2013-10-02 ソニー株式会社 表示装置、輝度調整装置、バックライト装置、輝度調整方法及びプログラム
KR101479992B1 (ko) * 2008-12-12 2015-01-08 삼성디스플레이 주식회사 전압 강하 보상 방법 및 그 시스템과 이를 포함한 표시 장치
TWI405181B (zh) * 2009-07-29 2013-08-11 Novatek Microelectronics Corp 增進顯示裝置之亮度均勻性的校正方法及相關裝置
CN101996618B (zh) * 2009-08-27 2013-11-06 联咏科技股份有限公司 增进亮度一致性的控制方法及亮度校正控制器
CN101777311B (zh) * 2010-03-05 2013-05-01 青岛海信电器股份有限公司 一种动态背光亮度控制方法
JP6082953B2 (ja) * 2012-04-16 2017-02-22 株式会社Ｊｏｌｅｄ 表示装置の製造方法
KR101926665B1 (ko) * 2014-10-31 2018-12-07 후아웨이 테크놀러지 컴퍼니 리미티드 커브피팅 회로, 아날로그 전치보상기 및 무선 주파수 신호 송신기
JP6548412B2 (ja) * 2015-03-10 2019-07-24 キヤノン株式会社 補正値生成装置及び補正値生成方法
US10714018B2 (en) * 2017-05-17 2020-07-14 Ignis Innovation Inc. System and method for loading image correction data for displays
CN107578755B (zh) * 2017-09-30 2019-09-17 晶晨半导体(上海)股份有限公司 一种屏幕亮度与色温的校正方法
CN107799084B (zh) * 2017-11-21 2019-11-22 武汉华星光电半导体显示技术有限公司 亮度补偿的装置及方法、存储器
CN110910814A (zh) * 2018-08-28 2020-03-24 杭州海康威视数字技术股份有限公司 Led模组校正方法、装置、led显示屏及存储介质
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US7773062B2 (en) 2006-11-03 2010-08-10 Global Oled Technology Llc Method and apparatus for uniformity compensation in an electroluminescent display
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JP2016009136A (ja) * 2014-06-25 2016-01-18 株式会社Ｊｏｌｅｄ 表示装置及びその製造方法

Also Published As

Publication number Publication date
JP2008535028A (ja) 2008-08-28
US7301618B2 (en) 2007-11-27
US8013814B2 (en) 2011-09-06
US20070296653A1 (en) 2007-12-27
US20060221326A1 (en) 2006-10-05

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