US20100156765A1 - Organic light emitting diode display - Google Patents

Organic light emitting diode display Download PDF

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Publication number
US20100156765A1
US20100156765A1 US12/654,362 US65436209A US2010156765A1 US 20100156765 A1 US20100156765 A1 US 20100156765A1 US 65436209 A US65436209 A US 65436209A US 2010156765 A1 US2010156765 A1 US 2010156765A1
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United States
Prior art keywords
substrate
oled display
encapsulation
layer
photochromic material
Prior art date
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Abandoned
Application number
US12/654,362
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English (en)
Inventor
Soon-Ryong Park
Woo-Sukof Jung
Hee-Chul Jeon
Eun-ah Kim
Hee-Seong Jeong
Noh-Min Kwak
Chul-Woo Jeong
Joo-Hwa Lee
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Samsung Display Co Ltd
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Samsung Mobile Display Co Ltd
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Filing date
Publication date
Application filed by Samsung Mobile Display Co Ltd filed Critical Samsung Mobile Display Co Ltd
Publication of US20100156765A1 publication Critical patent/US20100156765A1/en
Assigned to SAMSUNG MOBILE DISPLAY CO., LTD., A CORPORATION CHARTERED IN AND EXISTING UNDER THE LAWS OF THE REPUBLIC OF KOREA reassignment SAMSUNG MOBILE DISPLAY CO., LTD., A CORPORATION CHARTERED IN AND EXISTING UNDER THE LAWS OF THE REPUBLIC OF KOREA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JEON, HEE-CHUL, Jeong, Chul-Woo, JEONG, HEE-SEONG, JUNG, WOO-SUK, KIM, EUN-AH, KWAK, NOH-MIN, LEE, JOO-HWA, PARK, SOON RYONG
Assigned to SAMSUNG DISPLAY CO., LTD. reassignment SAMSUNG DISPLAY CO., LTD. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: SAMSUNG MOBILE DISPLAY CO., LTD.
Priority to US15/473,386 priority Critical patent/US10680209B2/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G02B5/23—Photochromic filters
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • H10K50/865—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. light-blocking layers
    • 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]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0236—Special surface textures
    • H01L31/02366—Special surface textures of the substrate or of a layer on the substrate, e.g. textured ITO/glass substrate or superstrate, textured polymer layer on glass substrate
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/841—Self-supporting sealing arrangements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/13—Active-matrix OLED [AMOLED] displays comprising photosensors that control luminance
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/871—Self-supporting sealing arrangements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • H10K59/8792—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. black layers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G09G2360/147—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen the originated light output being determined for each pixel
    • G09G2360/148—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen the originated light output being determined for each pixel the light being detected by light detection means within each pixel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/06—Polymers
    • H01L2924/062—Halogenated polymer
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/871—Self-supporting sealing arrangements
    • H10K59/8722—Peripheral sealing arrangements, e.g. adhesives, sealants

Definitions

  • the present invention relates to an organic light emitting diode (OLED) display. More particularly, the present invention relates to an OLED display having improved visibility outdoors by minimizing reflection of external light.
  • OLED organic light emitting diode
  • OLED organic light emitting diode
  • display quality is greatly influenced by external light. That is, when external light is transmitted to the OLED display, reflection of the external light occurs in layers that form an organic emission element and a thin film transistor.
  • a metal layer used as an electrode has high light reflectivity so that the metal layer reflects most of the external light. The reflected external light is mixed with the light emitted from an organic emission layer such that visibility of the screen is undesirably deteriorated.
  • a linear polarization film and a ⁇ /4 phase delay film are disposed in a side where the external light is transmitted in a contemporary OLED display.
  • a polarizing axis is changed by 90 degrees when the external light passes through the linear polarization film and the ⁇ /4 phase delay film and is then reflected by internal layers, and therefore the external light is absorbed since the external light cannot pass through the linear polarization film.
  • the reflection of the external light can be suppressed to thereby enhance visibility.
  • OLED organic light emitting diode
  • an OLED display constructed with a substrate where OLEDs are formed and an encapsulation member that is fixed onto the substrate while covering the OLEDs.
  • the encapsulation member includes a photochromic material so that the encapsulation member is colored by external light.
  • the substrate may be a semiconductor substrate, and the encapsulation member may be an encapsulation substrate.
  • the encapsulation substrate may be formed of glass.
  • the OLED display may further include a photosensor disposed in an overlapped area of the semiconductor substrate and the encapsulation substrate.
  • the encapsulation member may be a thin film encapsulation layer comprising a plurality of inorganic layers and a plurality of organic layers that are alternately stacked.
  • the farthermost layer among the plurality of inorganic layers and the plurality of organic layers from the substrate may include the photochromic material.
  • the OLED display may further include a photosensor disposed between the thin film encapsulation layer and the substrate.
  • the photochromic material may include one selected from a group of silver halide, zinc halide, cadmium halide, copper halide, and magnesium halide.
  • the photochromic material may include one selected from a group of spiropyrane, spironaphthoxazine dye, diarylethene derivatives, dehydropyridine, furylfulgide derivatives, and azobenzene derivatives.
  • FIG. 1 is an oblique view of an organic light emitting diode (OLED) display constructed as a first exemplary embodiment according to the principles of the present invention
  • FIG. 2 is a cross-sectional view of the OLED display constructed as the first exemplary embodiment according to the principles of the present invention
  • FIG. 3 shows a sub-pixel circuit of a panel assembly of FIG. 1 ;
  • FIG. 4 and FIG. 5 are partial cross-sectional views of the panel assembly of FIG. 1 ;
  • FIG. 6 is an oblique view of an OLED display constructed as a second exemplary embodiment according to the principles of the present invention.
  • FIG. 7 is a block diagram of the OLED display according to the second exemplary embodiment of the present invention.
  • FIG. 8 is a partial enlarged cross-sectional view of an OLED display constructed as a third exemplary embodiment according to the principles of the present invention.
  • FIG. 9 is a cross-sectional view of an OLED display constructed as a fourth exemplary embodiment according to the principles of the present invention.
  • FIG. 1 and FIG. 2 respectively show an oblique view and a cross-sectional view of an organic light emitting diode (OLED) display constructed as a first exemplary embodiment according to the principles of the present invention.
  • OLED organic light emitting diode
  • an OLED display 101 includes a panel assembly 12 having a display area A 10 and a pad area A 20 and displaying a predetermined video and visual image in display area A 10 , a flexible circuit board 14 fixed to pad area A 20 , and a printed circuit board 16 electrically connected to panel assembly 12 through flexible circuit board 14 .
  • Panel assembly 12 includes a first substrate (or, a semiconductor substrate) 18 and a second substrate (or, an encapsulation substrate) 22 that is smaller than first substrate 18 and having an edge fixed to first substrate 18 by a sealant 20 (refer to FIG. 2 ).
  • Display area A 10 is located in an area where first substrate 18 and
  • second substrate 20 are overlapped at an interior side of sealant 20 , and pad area A 20 is located on first substrate 18 at an external side of sealant 20 .
  • a plurality of subpixels are disposed in a matrix pattern in display region A 10 of first substrate 18 , and a scan driver (not shown) and a data driver (not shown).
  • pad electrodes (not shown) for transmitting electrical signals to the scan and data drivers are located.
  • An integrated circuit chip 24 is mounted on pad area A 20 of first substrate 18 , and flexible circuit board 14 is electrically connected to the pad electrodes and integrated circuit chip 24 .
  • a protective layer 26 is formed around integrated circuit chip 24 and flexible circuit board 14 to cover the pad electrodes formed in pad area A 20 for protection.
  • electronic components are provided for processing driving signals, and a connector 28 is provided for transmitting external signals to flexible circuit board 16 .
  • a bezel for increasing bending strength of panel assembly 12 or a buffering tape (not shown) for increasing impact resistance of panel assembly 12 may be formed.
  • Flexible circuit board 14 fixed to pad area A 20 is bent to the rear side of panel assembly 12 to make flexible circuit board 16 face the rear side of panel assembly 12 .
  • FIG. 3 shows a structure of a sub-pixel of the panel assembly of FIG. 1 .
  • FIG. 4 is a partial enlarged cross-sectional view of the panel assembly of FIG. 1 .
  • a sub-pixel of panel assembly 12 is formed of an OLED L 1 and a driving circuit unit.
  • OLED L 1 includes an anode (hole injection electrode) 30 , an organic emission layer 32 , and a cathode (electron injection electrode) 34
  • the driving circuit unit includes at least two thin film transistors T 1
  • the two thin film transistors T 1 and T 2 are a switching transistor T 1 and a driving transistor T 2 , respectively.
  • Switching transistor T 1 is connected to a scan line SL 1 and a data line DL 1 , and transmits a data voltage input to data line DL 1 according to a switching voltage that is input to scan line SL 1 to driving transistor T 2 .
  • Storage capacitor C 1 is connected to switching transistor T 1 and power source line VDD, and stores a voltage that corresponds to a voltage difference between a voltage transmitted from switching transistor T 1 and a voltage supplied to power source line VDD.
  • Driving transistor T 2 is connected to power source line VDD and storage capacitor C 1 , and supplies an output current I OLED that is proportional to the square of the difference between the voltage stored in storage capacitor C 1 and a threshold voltage to OLED L 1 .
  • OLED L 1 emits light by output current I OLED .
  • Driving transistor T 2 includes a source electrode 36 , a drain electrode 38 , and a gate electrode 40 , and anode 30 of OLED L 1 may be connected to drain electrode 38 of driving transistor T 2 .
  • the configuration of the sub-pixel is not limited thereto, and may be variously modified.
  • anode 30 is formed of a metal layer having a light reflection characteristic, and cathode 34 is formed of a transparent conductive layer. Therefore, light emitted from organic emission layer 32 passes through cathode 34 and second substrate 22 and is emitted out. Anode 30 reflects the light emitted toward first substrate 18 along with the light emitted from organic emission layer 32 to second substrate 22 to thereby enhance luminous efficiency.
  • Second substrate 22 is an
  • encapsulation member that covers OLEDs L 1 for protection, and is made of glass.
  • a substrate on which external light is incident that is, second substrate 22
  • Second substrate 22 including the photochromic material has a characteristic that displays a color when UV light illuminates second substrate 22 and returns to a transparent state when the UV light does not illuminates second substrate 22 .
  • the photochromic material is mixed with glass during a manufacturing process of second substrate 22 and uniformly dispersed inside second substrate 22 .
  • photochromic material 42 is schematically illustrated as round particles.
  • photochromic material 42 may be selected from a group consisting of silver halide, zinc halide, cadmium halide, copper halide, and magnesium halide.
  • photochromic material 42 may be selected from a group consisting of spiropyrane, spironaphthoxazine dye, diarylethene derivatives, dehydropyridine, furylfulgide derivatives, and azobenzene derivatives.
  • Photochromic material 42 included in second substrate 22 is not, however, limited thereto.
  • second substrate 22 including photochromic material 42 has high light transmittance because second substrate 22 becomes colorless upon exposure to weak sunlight, for example in a normal indoor environment.
  • second substrate 22 becomes colored by photochromic material 42 and absorbs external light. That is, in the case that an
  • second substrate 22 becomes colored (refer to FIG. 5 ).
  • OLED display 101 can increase visibility of the screen by reducing reflection of external light under a strong sunlight condition.
  • transmittance of light emitted from organic emission layer 32 is reduced due to coloration of second substrate 22 , but the amount of the reduced transmittance of light is less than that in a case in which a linear polarization film and a ⁇ /4 phase delay film are applied, instead of the photochromic material, on OLEDs L 1 . Accordingly, efficiency (luminance/power consumption) of OLED display 101 can be improved.
  • FIG. 6 is an oblique view of an OLED display constructed a second exemplary embodiment according to the principles of the present invention.
  • an OLED display 102 according to the second exemplary embodiment is the same as the OLED display of the first exemplary embodiment, except that a photosensor 44 is formed inside a panel assembly 12 .
  • a photosensor 44 is formed inside a panel assembly 12 .
  • Like reference numerals are used for like elements of the first exemplary embodiment.
  • Photosensor 44 is disposed on a portion of first substrate 18 which overlaps second substrate 22 .
  • Photosensor 44 may be disposed between sub-pixels in display area A 10 , or may be disposed between display area A 10 and a sealant 20 (refer to FIG. 2 ).
  • FIG. 6 illustrates a case in which photosensor 44 is exemplarily disposed at an external side of display area A 10 .
  • Photosensor 44 detects the amount of light passing through second substrate 22 in order to increase the light emission intensity of organic emission layer 32 (refer to FIG. 4 ) when second substrate 22 is colored.
  • FIG. 7 is a block diagram of the OLED display according to the second exemplary embodiment of the principles of the present invention.
  • OLED display 102 includes photosensor 44 , an analog to digital (A/D) converter 46 , a data driver 48 , and a panel assembly 12 where display area A 10 is formed.
  • A/D analog to digital
  • Photosensor 44 is formed of various types of sensors that can detect the amount of surrounding light.
  • photosensor 44 may be formed of one of a photodiode, a charge-coupled element, a charge injection element, a photomultiplier tube, a spectroradiometer, and a complementary metal-oxide semi-conductor (CMOS) photoelectric element.
  • CMOS complementary metal-oxide semi-conductor
  • Photosensor 44 outputs a voltage signal or a current signal corresponding to the amount of light passing through second substrate 22 .
  • a coloration degree of second substrate 22 is increased as the strength of the external light is increased, and photosensor 44 can detect a small amount of external light.
  • A/D converter 46 receives a voltage or a current output from photosensor 44 as an analog signal and converts the analog signal into a digital signal.
  • data driver 48 provides a data voltage that appropriately corresponds to the coloration degree of second substrate 22 to panel assembly 12 .
  • the data voltage output from data driver 48 is formed of individual data voltages representing red, green, and blue.
  • data driver 48 includes a gamma controller 50 .
  • Gamma controller 50 includes a plurality of gamma curves that respectively correspond to the coloration degree of second substrate 22 , detected by photosensor 44 .
  • Data driver 48 can control the data voltage provide to panel assembly 12 by using a data voltage setting value stored in gamma controller 50 .
  • OLED display 102 can enhance visibility and contrast ratio of the display by increasing light emission intensity of organic emission layer 30 (refer to FIG. 4 ) as the coloration degree of second substrate 22 is increased.
  • FIG. 8 is a partial enlarged cross-sectional view of an OLED display constructed as a third exemplary embodiment according to the principle of the present invention.
  • an OLED display 103 according to the third exemplary embodiment is the same as the OLED display of the first exemplary embodiment except that a thin film encapsulation layer 52 is provided as an encapsulation member instead of the second substrate of the first exemplary embodiment.
  • a thin film encapsulation layer 52 is provided as an encapsulation member instead of the second substrate of the first exemplary embodiment.
  • Like reference numerals are used for like elements of the first exemplary embodiment.
  • Thin film encapsulation layer 52 is formed or two or more inorganic layers 521 and two or more organic layers 522 .
  • Inorganic layers 521 and organic layers 522 are alternately stacked.
  • FIG. 8 illustrates a case in which thin film encapsulation layer 52 is formed by alternately stacking each of two inorganic layers 521 and each of two organic layers 522 .
  • Inorganic layer 521 may be formed of aluminum oxide or silicon oxide, and organic layer 522 may be formed of any one of epoxy, acrylate, and urethane acrylate. Inorganic layer 521 suppresses penetration of external moisture and oxygen, and organic layer 522 eases internal stress of inorganic layer 521 or fills micro-cracks and pinholes of inorganic layer 521 .
  • At least one layer includes a photochromic material 42 so that thin film encapsulation layer 52 is colored by external light.
  • photochromic material 42 is mixed with an inorganic layer forming material during the inorganic layer forming process so that photochromic material 42 can be uniformly dispersed inside inorganic layer 521 .
  • organic layer 522 includes photochromic material 42
  • photochromic material 42 is mixed with an organic layer forming material during the organic layer forming process so that photochromic material 42 can be uniformly dispersed inside organic layer 522 .
  • the uppermost layer (the farthermost layer from first substrate 18 ) among the plurality of layers forming thin film encapsulation layer 52 may include photochromic material 42 .
  • FIG. 8 illustrates a case in which photochromic material 42 is included in the uppermost organic layer 522 of thin film encapsulation layer 522 .
  • FIG. 9 is a cross-sectional view of an OLED display constructed as a fourth exemplary embodiment according to the principles of the present invention.
  • an OLED display 104 according to the fourth exemplary embodiment is the same as the OLED display of the third exemplary embodiment except that a photosensor 44 is provided in a lower portion of a thin film encapsulation layer 52 .
  • a photosensor 44 is provided in a lower portion of a thin film encapsulation layer 52 .
  • Like reference numerals are used for like elements of the first exemplary embodiment.
  • Photosensor 44 is disposed on a portion of a first substrate 18 which
  • Photosensor 44 may be disposed between sub-pixels in a display area A 10 , or may be disposed at an external side of display area A 10 .
  • FIG. 9 illustrates a case in which photosensor 44 is exemplarily disposed at the external side of display area A 10 .
  • Photosensor 44 detects the amount of light passing through thin film encapsulation layer 52 in order to increase light emission intensity of an organic emission layer 32 (refer to FIG. 8 ) when thin film encapsulation layer 52 is colored.
  • Photosensor 44 is connected to an A/D converter and a data driver, and configurations and functions of photosensor 44 , the A/D converter, the data driver, and a gamma controller are the same as those of the OLED display of the second exemplary embodiment.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
US12/654,362 2008-12-23 2009-12-17 Organic light emitting diode display Abandoned US20100156765A1 (en)

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KR1020080132374A KR101002659B1 (ko) 2008-12-23 2008-12-23 유기 발광 표시 장치
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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120256218A1 (en) * 2011-04-11 2012-10-11 Kwack Jin-Ho Organic light emitting diode display
US20130140982A1 (en) * 2011-12-01 2013-06-06 Soon-Ryong Park Organic light emitting display device and manufacturing method thereof
US20130168644A1 (en) * 2011-12-28 2013-07-04 Samsung Mobile Display Co., Ltd. Organic Light-Emitting Display Apparatus and Method of Manufacturing the Same
US20130207083A1 (en) * 2010-04-29 2013-08-15 Huntsman Advanced Materials (Switzerland) Gmbh Light-Emitting Device and Method for Manufacturing the Same
US20130242212A1 (en) * 2012-03-16 2013-09-19 Au Optronics Corporation Mirror switchable organic light emitting display and mirror switchable display
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