WO2024039177A1 - Procédé de compensation de dispositif d'affichage étirable à micro-del - Google Patents

Procédé de compensation de dispositif d'affichage étirable à micro-del Download PDF

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Publication number
WO2024039177A1
WO2024039177A1 PCT/KR2023/012117 KR2023012117W WO2024039177A1 WO 2024039177 A1 WO2024039177 A1 WO 2024039177A1 KR 2023012117 W KR2023012117 W KR 2023012117W WO 2024039177 A1 WO2024039177 A1 WO 2024039177A1
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WO
WIPO (PCT)
Prior art keywords
micro led
stretchable display
display device
emitting device
light emitting
Prior art date
Application number
PCT/KR2023/012117
Other languages
English (en)
Korean (ko)
Inventor
이수연
강지민
Original Assignee
서울대학교산학협력단
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 서울대학교산학협력단 filed Critical 서울대학교산학협력단
Priority claimed from KR1020230107003A external-priority patent/KR20240024032A/ko
Publication of WO2024039177A1 publication Critical patent/WO2024039177A1/fr

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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
    • 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]
    • 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

Definitions

  • the present disclosure relates to a display device, and more specifically, to a micro LED light emitting device mounted on a stretchable display device and a driving circuit included therein.
  • changes in characteristics may occur in thin film transistors inside pixels.
  • changes in characteristics eg, changes in threshold voltage, changes in mobility, etc.
  • changes in characteristics may occur in thin film transistors inside pixels.
  • the size of the stretchable display panel changes, the current flowing inside the pixels may change, causing luminance unevenness in the stretchable display panel.
  • a general micro LED refers to an ultra-small LED of 100 ⁇ m or less, and has the advantage of being small in size and consuming less power, enabling low power consumption, miniaturization, and lightweight display.
  • OLED organic light-emitting diodes
  • OLED organic light-emitting diodes Due to this potential as a next-generation display, many companies at home and abroad are currently strengthening their technology investments in micro LED.
  • the micro LED driving circuit is a circuit for implementing pixels and gray levels used in image expression through scan signals and data voltages of micro LEDs arranged in a matrix. Generally, one pixel driving circuit is used to drive one pixel.
  • the conventional OLED-based driving circuit used a PAM (Pulse Amplitude Modulation) driving method to express gray levels with the amount of current flowing through the OLED.
  • PAM Pulse Amplitude Modulation
  • grayscale is expressed by adjusting the current value, and the amount of current flowing through the OLED is controlled through the driving transistor (Driving TFT) of the driving circuit.
  • micro LED has the characteristic that the wavelength changes depending on the amount of current, so when expressing gradation using the PAM driving method, a wavelength shift occurs, and the color changes during the pixel driving process, causing screen distortion. There was this difficult problem.
  • the present invention is intended to solve the problems of the prior art described above, and the purpose of the present disclosure is to solve the problem of color change that occurs due to the stretching behavior of the display device when mounting a micro LED light emitting device on a stretchable display device. It is for this purpose.
  • the present invention is to provide a display device equipped with a micro LED light emitting device with improved color reproduction.
  • Another purpose of the present disclosure is to provide a micro LED display device that can implement grayscale expression of the display by fixing the amount of current and controlling the emission time, unlike the PAM driving method that expresses grayscale through the amount of current.
  • Another object of the present disclosure is to provide a micro LED display device that provides improved color reproduction of an input image signal and a method of driving the same.
  • Another purpose of the present disclosure is to propose a principle of a stretchable display device that can more efficiently and stably drive a micro LED scale inorganic light emitting device and to provide a display device including the same and a method of driving the same.
  • Another object of the present disclosure is to provide a display device including a driving circuit suitable for high-density integration and a driving method thereof by optimizing the design of various circuits that drive inorganic light-emitting devices.
  • the brightness (L) of the display is usually inversely proportional to the display area (A) and appears proportional to the current (I_OLED) of the light emitting diode.
  • the display is therefore subject to external strain ( ⁇ ).
  • ⁇ When stretched by , there was a problem that the brightness inevitably decreased (L/(1+ ⁇ )) as the display area increased (A(1+ ⁇ )).
  • the OLED current (I_ OLED ) is increased by (1+ ⁇ ) times to maintain the display brightness the same as before expansion, thereby compensating for the decrease in brightness of the stretchable display.
  • the present inventors would like to propose a method of compensating for the decrease in luminance due to stretching of the display panel, etc. by increasing the emission time according to the stretching rate while maintaining the current level.
  • a compensation method for a stretchable display device including a micro LED light emitting device includes a compensation circuit for a stretchable display device including a micro LED light emitting device, A method is used to compensate for the luminance change that occurs during the stretching process by increasing the emission time of the micro LED light emitting device.
  • the emission time of the micro LED light emitting device may increase proportionally according to the stretching ratio of the stretchable display device.
  • the current level of the micro LED light emitting device may be maintained the same during the stretching process of the stretchable display device.
  • the control of the light emission time includes a PWM circuit unit that adjusts the light emission time of the micro LED; And it may be performed through a compensation circuit including a CCG circuit unit that controls a constant current to flow while the micro LED emits light.
  • the stretchable display device includes a plurality of divided regions and a sensor that detects an elongation rate for each divided region, and is positioned in the divided region according to the detected stretching ratio of the divided region. This may be to increase the emission time of one or more pixels including micro LEDs.
  • a stretchable display device including a micro LED light-emitting device includes a drive circuit for micro LEDs, wherein pixels composed of a plurality of inorganic light-emitting devices have a plurality of pixels.
  • a stretchable display panel including a pixel array arranged in a row line, and a sub-pixel circuit provided for each of the plurality of inorganic light-emitting devices and providing driving current to the inorganic light-emitting devices; And during the data setting period, set the image data voltage in the subpixel circuits of the display panel in low line order, and during the light emission period, based on the sweep signal that sweeps from the first voltage to the second voltage and the set image data voltage.
  • a driving unit that drives the sub-pixel circuits so that the driving current is provided to the inorganic light-emitting devices of the pixel array in row line order
  • the sub-pixel circuit includes: a PWM circuit unit that adjusts the emission time of the micro LED; and a CCG circuit unit that controls a constant current to flow while the micro LED emits light, wherein the PWM circuit unit controls the emission time of the micro LED in accordance with the stretching ratio of the stretchable display panel. It may be.
  • the stretchable display includes divided regions, each of the divided regions further includes a sensor that measures a stretch ratio of the stretchable display, and the PWM circuit unit measures the stretching ratio of the sensor.
  • the emission time of one or more pixels including the micro LED located in the divided area may be controlled to increase in proportion to the value.
  • FIG. 1 shows the principle in which the luminance of a panel including a light-emitting element is deformed (reduced) as stretching deformation occurs in a stretchable display device, and the luminance is compensated through a compensation circuit to maintain the same brightness as before the stretching deformation occurred. It is a conceptual representation of the appearance.
  • FIG. 2 is a diagram illustrating the principle of compensating for a decrease in luminance by increasing the emission time while maintaining the current level in a stretchable display device including a micro LED light emitting device according to an embodiment of the present invention.
  • Figure 3 is a schematic diagram of a driving circuit of a stretchable display device including a micro LED light emitting device according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing an example of a pixel structure of a stretchable display device including a micro LED light-emitting device according to an embodiment of the present invention.
  • FIG. 5 is a block diagram showing the configuration of a stretchable display device including a micro LED light-emitting device according to an embodiment of the present invention.
  • FIG. 1 shows the principle in which the luminance of a panel including a light-emitting element is deformed (reduced) as stretching deformation occurs in a stretchable display device, and the luminance is compensated through a compensation circuit to maintain the same brightness as before the stretching deformation occurred. It is a conceptual representation of the appearance.
  • the stretchable display device of Figure 1 it is a method that can be considered for a stretchable display device typically equipped with OLED, and as described above, the stretchable display device is equipped with a micro LED whose color changes depending on the intensity of the current. It was a difficult method to use on display devices.
  • FIG. 2 is a diagram illustrating the principle of compensating for a decrease in luminance by increasing the emission time while maintaining the current level in a stretchable display device including a micro LED light emitting device according to an embodiment of the present invention.
  • the present inventors recognized the difficulty of applying the method considered in FIG. 1 to micro LEDs and considered a method of compensating brightness by adjusting the time while maintaining the same current as in FIG. 2.
  • Figure 3 is a schematic diagram of a driving circuit of a stretchable display device including a micro LED light emitting device according to an embodiment of the present invention.
  • the driving circuit may be composed of a combination of a PWM (Pulse Width Modulation) circuit and a CCG (Constant Current Generation) circuit.
  • the PWM circuit may control the emission time of the micro LED
  • the CCG circuit may play a role of allowing a constant current to flow while the micro LED emits light.
  • the PWM circuit unit may be proposed to include a PWM driving transistor, and the PWM circuit unit may determine the on/off timing of the PWM driving transistor through comparison between the data voltage (Vdata) and the sweep voltage (Vsweep). . Additionally, the PWM circuit unit may also perform the role of compensating the threshold voltage of the PWM circuit unit driving TFT.
  • the CCG circuit unit may also perform a role of compensating the threshold voltage of the CCG circuit unit driving TFT.
  • a compensation method for a stretchable display device including a micro LED light emitting device includes a compensation circuit for a stretchable display device including a micro LED light emitting device, A method is used to compensate for the luminance change that occurs during the stretching process by increasing the emission time of the micro LED light emitting device.
  • the emission time of the micro LED light emitting device may increase proportionally according to the stretching ratio of the stretchable display device.
  • the current level of the micro LED light emitting device may be maintained the same during the stretching process of the stretchable display device.
  • the control of the light emission time includes a PWM circuit unit that adjusts the light emission time of the micro LED; And it may be performed through a compensation circuit including a CCG circuit unit that controls a constant current to flow while the micro LED emits light.
  • the stretchable display device includes a plurality of divided regions and a sensor that detects an elongation rate for each divided region, and is positioned in the divided region according to the detected stretching ratio of the divided region. This may be to increase the emission time of one or more pixels including micro LEDs.
  • a stretchable display device equipped with micro LED may have different degrees of stretching for each area.
  • uniform luminance can be maintained by determining the degree of stretching that varies from region to region and controlling the emission time of pixels in regions with a high degree of stretching accordingly.
  • FIG. 4 is a schematic diagram showing an example of a pixel structure of a stretchable display device including a micro LED light-emitting device according to an embodiment of the present invention.
  • FIG. 5 is a block diagram showing the configuration of a stretchable display device including a micro LED light-emitting device according to an embodiment of the present invention.
  • a stretchable display device including a micro LED light-emitting device includes a drive circuit for micro LEDs, wherein pixels composed of a plurality of inorganic light-emitting devices have a plurality of pixels.
  • a stretchable display panel including a pixel array arranged in a row line, and a sub-pixel circuit provided for each of the plurality of inorganic light-emitting devices and providing driving current to the inorganic light-emitting devices; And during the data setting period, set the image data voltage in the subpixel circuits of the display panel in low line order, and during the light emission period, based on the sweep signal that sweeps from the first voltage to the second voltage and the set image data voltage.
  • a driving unit that drives the sub-pixel circuits so that the driving current is provided to the inorganic light-emitting devices of the pixel array in row line order
  • the sub-pixel circuit includes: a PWM circuit unit that adjusts the emission time of the micro LED; and a CCG circuit unit that controls a constant current to flow while the micro LED emits light, wherein the PWM circuit unit controls the emission time of the micro LED in accordance with the stretching ratio of the stretchable display panel. It may be.
  • the stretchable display includes divided regions, each of the divided regions further includes a sensor that measures a stretch ratio of the stretchable display, and the PWM circuit unit measures the stretching ratio of the sensor.
  • the emission time of one or more pixels including the micro LED located in the divided area may be controlled to increase in proportion to the value.

Abstract

La présente invention concerne un circuit de compensation pour un dispositif d'affichage étirable comprenant une micro-DEL, et elle propose une technologie destinée à compenser le changement d'éclairement qui se produit pendant l'étirement du dispositif d'affichage étirable en augmentant la durée d'émission de lumière de l'élément électroluminescent à micro-DEL.
PCT/KR2023/012117 2022-08-16 2023-08-16 Procédé de compensation de dispositif d'affichage étirable à micro-del WO2024039177A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20220101764 2022-08-16
KR10-2022-0101764 2022-08-16
KR1020230107003A KR20240024032A (ko) 2022-08-16 2023-08-16 스트레처블 마이크로 led 표시 장치의 보상방법
KR10-2023-0107003 2023-08-16

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WO2024039177A1 true WO2024039177A1 (fr) 2024-02-22

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120065273A (ko) * 2009-05-12 2012-06-20 더 보드 오브 트러스티즈 오브 더 유니버시티 오브 일리노이 변형가능 및 반투과 디스플레이를 위한 초박형, 미세구조 무기발광다이오드의 인쇄 어셈블리
KR102271588B1 (ko) * 2018-06-13 2021-07-01 윤구(구안) 테크놀로지 컴퍼니 리미티드 스트레처블 디스플레이 및 표시 장치
KR102321057B1 (ko) * 2020-07-17 2021-11-03 (주)피플인넷 스트레쳐블 디스플레이 입체 구현 시스템
KR20220027531A (ko) * 2020-08-27 2022-03-08 연세대학교 산학협력단 인장 시에도 해상도가 변하지 않는 스트레처블 디스플레이를 위한 픽셀 구조 및 이의 배치 방법
KR20220080663A (ko) * 2020-12-07 2022-06-14 삼성전자주식회사 스트레처블 디스플레이의 인장 정보에 근거하여 광학 센서를 제어하기 위한 방법, 전자 장치 및 저장 매체

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120065273A (ko) * 2009-05-12 2012-06-20 더 보드 오브 트러스티즈 오브 더 유니버시티 오브 일리노이 변형가능 및 반투과 디스플레이를 위한 초박형, 미세구조 무기발광다이오드의 인쇄 어셈블리
KR102271588B1 (ko) * 2018-06-13 2021-07-01 윤구(구안) 테크놀로지 컴퍼니 리미티드 스트레처블 디스플레이 및 표시 장치
KR102321057B1 (ko) * 2020-07-17 2021-11-03 (주)피플인넷 스트레쳐블 디스플레이 입체 구현 시스템
KR20220027531A (ko) * 2020-08-27 2022-03-08 연세대학교 산학협력단 인장 시에도 해상도가 변하지 않는 스트레처블 디스플레이를 위한 픽셀 구조 및 이의 배치 방법
KR20220080663A (ko) * 2020-12-07 2022-06-14 삼성전자주식회사 스트레처블 디스플레이의 인장 정보에 근거하여 광학 센서를 제어하기 위한 방법, 전자 장치 및 저장 매체

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