CN106023888A - OLED miniaturized display constant-brightness modulation method - Google Patents

OLED miniaturized display constant-brightness modulation method Download PDF

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Publication number
CN106023888A
CN106023888A CN201610522636.1A CN201610522636A CN106023888A CN 106023888 A CN106023888 A CN 106023888A CN 201610522636 A CN201610522636 A CN 201610522636A CN 106023888 A CN106023888 A CN 106023888A
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Prior art keywords
brightness
value
oled
driving voltage
difference
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CN201610522636.1A
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CN106023888B (en
Inventor
朱胜迪
段瑜
杨俊彦
曹坤宇
吴斌
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YUNNAN NORTH OLIGHTEK OPTO-ELECTRONIC TECHNOLOGY Co Ltd
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YUNNAN NORTH OLIGHTEK OPTO-ELECTRONIC TECHNOLOGY Co Ltd
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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
    • G09G3/30—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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits

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  • 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)

Abstract

The invention relates to the technical field of display brightness control of an OLED miniaturized display and specifically relates to an OLED miniaturized display constant-brightness modulation method. According to the invention, a compensation coefficient is determined through actual measurement of a difference between a current brightness value and a calibrated brightness value, driving current compensation or driving voltage compensation is carried out through the compensation coefficient, and thus the purpose of maintaining constant brightens of the OLED miniaturized display is realized. According to the invention, modulation stepping is automatically adjusted according to the difference between current brightness and fixed brightness in a modulation process so that the phenomenon of excessive modulation caused by too frequent modulation or mismatch between the modulations stepping and the brightness difference in a conventional modulation mode is avoided.

Description

OLED minitype displayer constant luminance modulator approach
Technical field
The invention belongs to OLED minitype displayer display brightness and control technical field, be specially a kind of OLED minitype displayer constant luminance modulator approach.
Background technology
OLED is organic electroluminescent LED, it it is a kind of emerging Display Technique of development in recent years, this Display Technique have from main light emission, low-voltage direct-current driving, all solidstate, visual angle width, lightweight, a series of features such as large scale and flexible panel, technique are simple can be made, and there are the potentiality of low cost, disclosure satisfy that the current Information technology epoch to Display Technique higher performance and the requirement of bigger information capacity, become one of current scientific circles and the most popular problem of industrial circle.In general, display screen diagonal is less than 1 inch, referred to as OLED minitype displayer.
OLED minitype displayer can be widely used in every field, uses brightness requirement different, but be typically desirable that OLED minitype displayer can keep constant operating brightness under different occasions.Growth along with the device working time, device brightness and required value can occur deviation in various degree, in order to meet use requirement, it is necessary to OLED minitype displayer to be carried out constant luminance modulation, keep OLED minitype displayer to stablize and be operated in constantly under certain brightness.
OLED minitype displayer typically divides electric current to drive and voltage drives both of which, and the brightness of OLED minitype displayer is linear with driving electric current, becomes non-linear relation with driving voltage.Modulated luminance typically uses to compensate and drives the mode of electric current or driving voltage to realize.Existing modulation system is mainly the horizontal modulation system determining stepping, readings according to luminance sensor judges that whether present intensity is more than or less than fixing brightness, if greater than just regulating OLED by its luminance-reduction by fixing stepping, also it is same regulative mode (such as crossing bright with regard to-1, cross the regulative mode of the most just+1) less than the situation of constant brightness.This modulation system is present intensity and constant brightness comparison in difference are big when, and its number of times adjusted understands showed increased, inefficient；And if the step value of modulation is excessive luminance difference is less when, will result in the result of excessively modulation so that the brightness of OLED can not well maintain constant brightness.
Summary of the invention
The problem existed for the modulation of existing OLED minitype displayer constant luminance, the present invention proposes a kind of OLED minitype displayer constant luminance modulator approach.
The OLED minitype displayer constant luminance modulator approach of the present invention, it is characterised in that realized by following steps:
(1) set up OLED minitype displayer and demarcate brightness value classification standard, by demarcation brightness value Fix_B value classification:
(2) different standard compensation difference Dif_B demarcated under brightness value is determined.That is:
(3) calculating of coefficient S T is compensated according to OLED minitype displayer actual measurement present intensity value Cur_B and the difference demarcating brightness value Fix_B:
(4) set up penalty coefficient ST grade and driving voltage offset or drive the relation between current offset values.Penalty coefficient
ST={ driving voltage offset C_V corresponding to 0,0.2,0.4,0.6,0.8,1}com=0,1,2,3,4,5} or driving current offset values C_C={0,8,16,24,32,40}, it may be assumed that
(5) after have selected corresponding driving voltage offset or driving current offset values, being modulated plus offset by current driving voltage value or driving current value, final realization keeps the work of OLED minitype displayer brightness constancy.
The positive and negative of described final offset should be determined with demarcating the positive and negative of brightness value difference by actual measurement present intensity value.When present drive voltage value or driving current setting value are modulated plus offset, the sign symbol of offset should count wherein, that is:, when the difference of actual measurement present intensity value Cur_B and demarcation brightness value Fix_B is negative value, driving voltage offset and driving current offset values are negative value.
The OLED minitype displayer constant luminance modulator approach of the present invention, by the way of driving voltage compensates and drives current compensation, keeps OLED display brightness constancy.This method its regulation stepping during regulation can be automatically adjusted according to the difference size of present intensity and constant brightness, avoid modulating number of times present in traditional modulation mode with this too much, or the phenomenon excessively modulated that modulation stepping is not mated with luminance difference and caused.
Specific embodiments
Intensification modulation is carried out below in conjunction with real work situation.
Embodiment 1:(1) OLED minitype displayer need to be at 100 cd/m2Brightness under be operated, its demarcate brightness value Fix_B be 100 cd/m2.Because 0 < Fix_B≤100, it is determined that standard compensation difference Dif_B under this demarcation brightness is 5；
(2) actual measurement present intensity value Cur_B is 103 cd/m2, then the difference B_degree=103-100=3 cd/m between actual measurement present intensity value and demarcation brightness value2；
(3) penalty coefficient ST=(Cur_B-Fix_B)/Dif_B=3/5=0.6 is calculated；
(4) according to ST=0.6, the driving voltage offset C_V of its correspondencecomIt is 3；
(5) being modulated plus offset with current driving voltage value, final realization keeps OLED minitype displayer Brightness Duty 100 cd/m2Under.
Embodiment 2:(1) OLED minitype displayer need to be at 1100 cd/m2Brightness under be operated, its demarcate brightness value Fix_B be 1100 cd/m2.Because 500 < Fix_B≤1000, it is determined that standard compensation difference Dif_B under this demarcation brightness is 15；
(2) actual measurement present intensity value Cur_B is 918 cd/m2, then difference B_degree=918-1100=-182 between actual measurement present intensity value and demarcation brightness value cd/m2；
(3) penalty coefficient ST=(Cur_B-Fix_B)/Dif_B=is calculated -182/15= -12.13；
(4) it is negative value according to ST=12.13 and present intensity value and the difference demarcated between brightness value, the driving voltage offset C_V of its correspondencecomFor-5；
(5) being modulated plus offset with current driving voltage value, final realization keeps OLED minitype displayer Brightness Duty 100 cd/m2Under.

Claims (2)

1.OLED miniscope constant luminance modulator approach, it is characterised in that realized by following steps:
(1) set up OLED minitype displayer and demarcate brightness value classification standard, by demarcation brightness value Fix_B value classification:
(2) different standard compensation difference Dif_B demarcated under brightness value is determined, it may be assumed that
(3) calculating of coefficient S T is compensated according to OLED minitype displayer actual measurement present intensity value Cur_B and the difference demarcating brightness value Fix_B:
(4) set up penalty coefficient ST grade and driving voltage offset or drive the relation between current offset values；
Penalty coefficient ST={ driving voltage offset C_V corresponding to 0,0.2,0.4,0.6,0.8,1}com=0,1,2,3,4,5} or driving current offset values C_C={0,8,16,24,32,40}, it may be assumed that
(5) after have selected corresponding driving voltage offset or driving current offset values, being modulated plus offset with current driving voltage value or driving current setting value, final realization keeps OLED minitype displayer brightness constancy to work.
2. OLED minitype displayer constant luminance modulator approach as claimed in claim 1, it is characterised in that when the difference of actual measurement present intensity value Cur_B and demarcation brightness value Fix_B is negative value, driving voltage offset and driving current offset values are negative value.
CN201610522636.1A 2016-07-06 2016-07-06 OLED minitype displayer constant luminance modulator approach Active CN106023888B (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107507854A (en) * 2017-09-13 2017-12-22 昆山维信诺科技有限公司 Oled display panel
CN107978230A (en) * 2016-10-25 2018-05-01 昆山国显光电有限公司 The bending of flexible display screen shows compensation method and system
CN108962136A (en) * 2018-09-28 2018-12-07 京东方科技集团股份有限公司 Luminance compensation method and device
CN109545144A (en) * 2018-11-27 2019-03-29 武汉华星光电半导体显示技术有限公司 A kind of luminance regulating method and device of display panel
WO2019104840A1 (en) * 2017-11-30 2019-06-06 武汉华星光电半导体显示技术有限公司 Compensation system and method for oled display panel
CN112489591A (en) * 2020-12-03 2021-03-12 昆山工研院新型平板显示技术中心有限公司 Driving method and device of display panel
CN113035152A (en) * 2021-03-16 2021-06-25 武汉天马微电子有限公司 Gray scale brightness adjusting method and device of display panel

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1393293B1 (en) * 2001-04-04 2010-11-17 Siemens Aktiengesellschaft Aging compensation in oled displays
CN101369405A (en) * 2008-10-13 2009-02-18 南京Lg新港显示有限公司 Compensation apparatus for adjusting display brightness and regulation method of the compensation apparatus
CN103500566B (en) * 2013-09-29 2016-10-05 京东方科技集团股份有限公司 Display device, display brightness inequality improve device and ameliorative way
CN103987159A (en) * 2014-04-14 2014-08-13 立锜科技股份有限公司 Luminance adjusting method
CN104505055B (en) * 2014-12-31 2017-02-22 深圳创维－Rgb电子有限公司 Method and device for adjusting backlight brightness

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107978230A (en) * 2016-10-25 2018-05-01 昆山国显光电有限公司 The bending of flexible display screen shows compensation method and system
CN107978230B (en) * 2016-10-25 2020-01-31 昆山国显光电有限公司 Flexible display screen bending display compensation method and system
CN107507854A (en) * 2017-09-13 2017-12-22 昆山维信诺科技有限公司 Oled display panel
WO2019104840A1 (en) * 2017-11-30 2019-06-06 武汉华星光电半导体显示技术有限公司 Compensation system and method for oled display panel
CN108962136A (en) * 2018-09-28 2018-12-07 京东方科技集团股份有限公司 Luminance compensation method and device
CN109545144A (en) * 2018-11-27 2019-03-29 武汉华星光电半导体显示技术有限公司 A kind of luminance regulating method and device of display panel
US11302250B2 (en) 2018-11-27 2022-04-12 Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. Method and device for luminance adjustment for display panel
CN112489591A (en) * 2020-12-03 2021-03-12 昆山工研院新型平板显示技术中心有限公司 Driving method and device of display panel
CN112489591B (en) * 2020-12-03 2022-05-03 昆山工研院新型平板显示技术中心有限公司 Driving method and device of display panel
CN113035152A (en) * 2021-03-16 2021-06-25 武汉天马微电子有限公司 Gray scale brightness adjusting method and device of display panel
CN113035152B (en) * 2021-03-16 2022-06-03 武汉天马微电子有限公司 Gray scale brightness adjusting method and device of display panel

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