US20120261685A1 - Display device - Google Patents
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- US20120261685A1 US20120261685A1 US13/533,396 US201213533396A US2012261685A1 US 20120261685 A1 US20120261685 A1 US 20120261685A1 US 201213533396 A US201213533396 A US 201213533396A US 2012261685 A1 US2012261685 A1 US 2012261685A1
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Images
Classifications
-
- 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
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
- H10K50/13—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit
-
- 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
- H10K59/875—Arrangements for extracting light from the devices
- H10K59/876—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
-
- 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
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/852—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
-
- 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
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/15—Hole transporting layers
-
- 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
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/16—Electron transporting layers
-
- 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
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
-
- 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
Definitions
- the present invention relates to a display device in which self-light emission type elements such as organic electroluminescence (EL) elements are disposed, and more particularly to a display device in which elements, for emitting lights having respective colors, each having a cavity structure are provided.
- EL organic electroluminescence
- an organic electroluminescence (EL) display device using organic EL elements has been put into practical use as a display device substituted for a liquid crystal display device.
- the organic EL display device has a wider view angle than that in the liquid crystal display device because it is of a self-light emission type.
- the organic EL display device is expected to have a sufficient response to a high-speed video signal for high definition.
- Patent Document 1 PCT Patent Publication No. WO01/39554 (pamphlet) (hereinafter referred to as Patent Document 1) and Japanese Patent Laid-Open No. 2006-147598 (hereinafter referred to as Patent Document 2).
- Patent Document 3 Japanese Patent Laid-Open No. Hei 9-190883
- Patent Document 1 and Patent Document 2 in which the optical distance of the cavity portion is set as the minimum value, a thickness of an organic layer in the organic EL element is reduced.
- the thinning of the organic layer causes a problem that pixel defects, such as a vanishing point, because an inter-electrode short-circuit generates.
- a color organic EL display device in which organic EL elements for emitting lights having colors of red (R), green (G) and blue (B), respectively, are disposed on a substrate, when there is a dispersion in view angle characteristics of the organic EL elements for emitting lights having colors of R, G and B, the view angle characteristics of white is generally deteriorated. In other words, even when the view angle characteristics of the organic EL element are improved every color, it may be impossible to enhance the view angle characteristics of white as long as there is the dispersion in the view angle characteristics of the colors.
- a display device which is capable of reducing pixel defects of organic EL elements, and enhancing view angle characteristics of white which is easily visualized in terms of a visual feature of a human being without increasing a cost in a structure in which the organic EL elements, for emitting lights having the respective colors, each having a resonator structure are disposed.
- a display device having light emitting elements corresponding to respective colors disposed on a substrate.
- Each of the light emitting elements corresponding to the respective colors has a cavity structure in which a light emission functioning layer including a light emitting layer is held between a reflecting electrode and a semitransmitting electrode.
- a cavity order of at least the light emitting element adapted to resonate a light, having the shortest wavelength, of the light emitting elements corresponding to the respective colors is 1, and a cavity order of each of other light emitting elements is 0.
- the light emission functioning layer except for the light emitting layer is common to the light emitting elements corresponding to the respective colors.
- the cavity order of at least the light emitting element adapted to resonate the light, having the shortest wavelength (that is, the light emitting element having the shortest optical distance L in the cavity portion (the light emission functioning layer) when the cavity orders are identical to one another) of the light emitting elements corresponding to the respective colors and each having the cavity structure is 1, and the cavity order of each of other light emitting elements is 0.
- the light emission functioning layer in at least the light emitting element having the cavity portion having the thinnest film thickness can be thickened to suppress the generation of the vanishing point while the deterioration of the view angle characteristics of the lights extracted from the light emitting elements, respectively, is suppressed.
- the layers having the same structure and constituting the light emission functioning layer except for the light emitting layer in the light emitting elements are made the common layer.
- the display device of an embodiment of the present invention it is possible to reduce the pixel defects of the organic EL elements, and to enhance the view angle characteristics of white which is easily visualized in terms of the visual feature of a human being without increasing the cost in the color display device in which the organic EL elements corresponding to the respective colors and each having the resonator structure are disposed.
- FIG. 1 is a cross sectional view of a main portion explaining a display device according to a first embodiment of the present invention
- FIG. 2 is a cross sectional view of a main portion explaining a display device according to a second embodiment of the present invention
- FIG. 3 is a cross sectional view of a main portion explaining a display device according to a third embodiment of the present invention.
- FIG. 4 is a circuit diagram, partly in block, showing an example of a circuit configuration of the display device of the first, second or third embodiment of the present invention
- FIG. 5 is a structural view showing a module shaped display device, having a sealing structure to which an embodiment of the present invention is applied;
- FIG. 6 is a perspective view of a television set to which an embodiment of the present invention is applied.
- FIGS. 7A and 7B are respectively a perspective view of a digital camera, when viewed from a front side, to which an embodiment of the present invention is applied, and a perspective view of the digital camera, when viewed from a back side, to which an embodiment of the present invention is applied;
- FIG. 8 is a perspective view showing a notebook-size personal computer to which an embodiment of the present invention is applied;
- FIG. 9 is a perspective view showing a video camera to which an embodiment of the present invention is applied.
- FIGS. 10A to 10G are respectively a front view of mobile terminal equipment or, for example, a mobile phone, in an open state, to which an embodiment of the present invention is applied, a side elevational view thereof, a front view thereof in a close state, a left side elevational view thereof, a right side elevational view thereof, a top plan view thereof, and a bottom view thereof.
- FIG. 1 is a cross sectional view of a main portion explaining a display device according to a first embodiment of the present invention.
- organic EL elements 5 r, 5 g and 5 b for emitting lights having colors of red (R), green (G) and blue (B), respectively, that is, the red light emitting element 5 r, the green light emitting element 5 g and the blue light emitting element 5 b are disposed in a matrix on a substrate 3 .
- the display device 1 a is structured as an upper surface emission type display device in which the lights emitted from the light emitting elements 5 r, 5 g and 5 b, respectively, are extracted from a side opposite to the substrate 3 .
- the substrate 3 is a so-called thin film transistor (TFT) substrate obtained by disposing and forming TFT transistors (not shown) on a surface layer of a glass substrate, a silicon substrate, a plastic substrate or the like. Also, a surface of the substrate 3 is covered with a planarization insulating film.
- TFT thin film transistor
- each of the light emitting elements 5 r, 5 g and 5 b is structured in a way that an anode 7 , a light emission functioning layer 9 , an electron injecting layer, and a cathode 11 are laminated in this order on the substrate 3 .
- each of the light emitting elements 5 r, 5 g and 5 b is structured in the form of a minute resonator structure in which the anode 7 is formed as a mirror composed of a reflecting electrode, the cathode 11 is formed as a half mirror composed of a semitransmissive-semireflecting electrode, and the light having a specific wavelength emitted from the light emitting element 5 r, 5 g or 5 b is resonated to be extracted from the cathode (half mirror) 11 side.
- an optical distance Lr of a cavity portion is adjusted so that the lights each having a color of red falling within a red waveform region are resonated in the cavity portion between the corresponding one of the anodes (mirrors) 7 and the cathode (half mirror) 11 , thereby obtaining extraction efficiency at a local maximum.
- an optical distance Lg of a cavity portion is adjusted so that the lights each having a color of green falling within a green waveform region are resonated in the cavity portion between the corresponding one of the anodes (mirrors) 7 and the cathode (half mirror) 11 , thereby obtaining extraction efficiency at a local maximum.
- an optical distance Lb of a cavity portion is adjusted so that the lights each having a color of blue falling within a blue waveform region are resonated in the cavity portion between the corresponding one of the anodes (mirrors) 7 and the cathode (half mirror) 11 , thereby obtaining extraction efficiency at a local maximum.
- the lights having emission colors of R, G and B are extracted from the light emitting elements 5 r, 5 g and 5 b at sufficient intensities, respectively.
- optical distance L (Lr, Lg or Lb) of the light emitting element 5 r, 5 g or 5 b is set within the range meeting Expression (1):
- ⁇ (radian) is a sum of phase shifts ⁇ 1 and ⁇ 2 of reflected lights generated on both ends of the cavity portion
- ⁇ is a peak wavelength of a spectrum desired to be extracted
- m is a cavity order as an integral number allowing the optical distance L to be positive.
- L and ⁇ may have a common unit, and thus (nm), for example, is used as the common unit.
- the feature of the display device la of the first embodiment is that, of the light emitting elements 5 r, 5 g and 5 b, the blue light emitting element 5 b which resonates the shortest wavelength has the cavity order m of 1, and the red light emitting element 5 r and the green light emitting element 5 g have each the cavity order m of 0.
- optical distances Lr, Lg and Lb in the light emitting elements 5 r, 5 g and 5 b in which the cavity orders are set as 0, 0 and 1, respectively, are adjusted based on film thicknesses of the light emission functioning layer 9 , respectively, as will be described later.
- each of the anodes 7 is structured in the form of the mirror composed of the reflecting electrode.
- a thickness of each of the anodes 7 in a lamination direction (hereinafter referred to as “a film thickness”), for example, has a value between 100 to 1000 nm.
- a film thickness has a value between 100 to 1000 nm.
- a metallic element such as chromium (Cr), gold (Au), platinum (Pt), nickel (Ni), copper (Cu), tungsten (W) or silver (Ag), or an alloy thereof, for example, is given as a material of which such an anode 7 is made.
- the anodes 7 are formed in a pattern so as to correspond to the pixels, respectively. Also, the anodes 7 are electrically connected to the TFTs through the contact holes (not shown), respectively, which are formed in an interlayer insulating film covering the surface of the substrate 3 .
- Each of the anodes (mirrors) 7 formed in a pattern so as to correspond to the pixels, respectively, is covered in a periphery thereof with an insulating film 15 with only a central portion thereof being exposed.
- This insulating film 15 is made of either an organic insulating material such as polyimide or a photo resist, or an inorganic insulating material such as a silicon oxide.
- the light emission functioning layer 9 provided on each of the anodes (mirrors) 7 is composed of a hole injecting layer 9 - 1 , a hole transporting layer 9 - 2 , a light emitting layer 9 - 3 , and an electron transporting layer 9 - 4 which are laminated in this order on the corresponding one of the anodes 7 .
- a film thickness adjusting layer 9 - 2 ′ for adjusting the cavity order m is formed in a pattern on a part of the light emitting elements 5 r, 5 g and 5 b (the blue light emitting element 5 b in this embodiment).
- This film thickness adjusting layer 9 - 2 ′ may be made of the same material as that of which any of the layers constituting the light emission functioning layer 9 is made.
- the film thickness adjusting layer 9 - 2 ′ for example, is formed, as a second hole transporting layer made of the same material as that of which the hole transporting layer 9 - 2 is made, between the hole transporting layer 9 - 2 and the blue light emitting layer 9 - 3 b.
- the light emitting layers 9 - 3 for emitting the lights having the colors of R, G and B, respectively, of the layers constituting the light emission functioning layer 9 are formed in a pattern so as to correspond to the light emitting elements 5 r, 5 g and 5 b, respectively.
- the film thickness adjusting layer 9 - 2 ′ is formed in a pattern only in the blue light emitting element 5 b.
- the hole injecting layer 9 - 1 , the hole transporting layer 9 - 2 and the electron transporting layer 9 - 4 other than the light emitting layer 9 - 3 and the film thickness adjusting layer 9 - 2 ′ are common in structure to the light emitting elements 5 r, 5 g and 5 b, and thus are provided in the form of a common layer. This is the feature of the display device of this embodiment.
- the optical distances Lr, Lg and Lb in the light emitting elements 5 r, 5 g and 5 b in which the cavity orders m are set in the manner described above, respectively, are adjusted based on the film thicknesses of the light emitting layers 9 - 3 for emitting the red light, the green light and the blue light in the light emitting elements 5 r, 5 g and 5 b, respectively, together with the film thickness of the film thickness adjusting layer 9 - 2 ′ in the blue light emitting element 5 b.
- the layers constituting the light emission functioning layer 9 will be described from the anode (mirror) 7 side.
- the hole injecting layer 9 - 1 is a buffer layer for enhancing an efficiency of injecting the holes into the light emission functioning layer 19 , and preventing occurrence of a leakage current.
- the hole injecting layer 9 - 1 is provided as being common to the pixels so as to cover the anodes 7 and the insulating film 15 .
- Such a hole injecting layer 9 - 1 is made of a general hole injecting material.
- the hole injecting layer 9 - 1 is made of either 4,4′,4′′-tris (3-methylphenylphenylamino) triphenylamine (m-MTDATA), or 4, 4′, 4′′-tris (2-naphtylphenylamino) triphenylamine (2-TNATA).
- a film thickness of such a hole injecting layer 9 - 1 for example, is set within the range of 5 to 300 nm.
- the hole transporting layer 9 - 2 is provided for the purpose of enhancing an efficiency of transporting the holes to the light emitting layer 9 - 3 .
- the hole transporting layer 9 - 2 is provided as being common to the pixels on the hole injecting layer 9 - 1 .
- Such a hole transporting layer 9 - 2 is made of a general hole transporting material.
- the hole transporting layer 9 - 2 is made of bis [(N-naphthyl)-N-phenyl] benzidine ( ⁇ -NPD).
- a film thickness of such a hole transporting layer 9 - 2 for example, is set within the range of 5 to 300 nm.
- hole injecting layer 9 - 1 and hole transporting layer 9 - 2 described above may have lamination structures, respectively, each of which is composed of a plurality of layers.
- the film thickness adjusting layer 9 - 2 ′ provided only in the blue light emitting element 5 b may be made of the same material as that of which the hole transporting layer 9 - 2 is made.
- a film thickness of the film thickness adjusting layer 9 - 2 ′ is set so that the blue light emitting element 5 b has the cavity order m of 1. It is noted that the film thickness adjusting layer 9 - 2 ′ made of such a hole transporting material may also be provided between the hole transporting layer 9 - 2 and the hole injecting layer 9 - 1 .
- the light emitting layer 9 - 3 is a layer in which the holes injected from the anode 7 side and the electrons injected from the cathode 11 side are re-combined with each other to emit the lights.
- the red light emitting layer 9 - 3 r for emitting red lights is provided in the red light emitting element 5 r.
- the green light emitting layer 9 - 3 g for emitting green lights is provided in the green light emitting element 5 g.
- the blue light emitting layer 9 - 3 b for emitting blue lights is provided in the blue light emitting element 5 b.
- the light emitting layers 9 - 3 r, 9 - 3 g and 9 - 3 b are formed in a pattern so as to correspond to the pixels, respectively, in a state of perfectly infilling opening windows formed in the insulating film 15 .
- the optical distances Lr, Lg and Lb thereof are adjusted so that the red lights each having the specific wavelength are resonated between the corresponding one of the anodes (mirrors) 7 and the cathode (half mirror) 11 , the green lights each having the specific wavelength are resonated between the corresponding one of the anodes (mirrors) 7 and the cathode (half mirror) 11 , and the blue lights each having the specific wavelength are resonated between the corresponding one of the anodes (mirrors) 7 and the cathode (half mirror) 11 .
- the optical distances Lr, Lg and Lb are adjusted based on the differences in film thickness among the light emitting layers 9 - 3 r, 9 - 3 g and 9 - 3 b together with the film thickness of the film thickness adjusting layer 9 - 2 ′.
- the red light emitting layer 9 - 3 r of the red light emitting element 5 r is made of a material obtained by mixing 8-quinolinol aluminum complex (Alq3) with 40 Vol % 2,6-bis [4-[N-(4-methoxyphenyl)-N-phenyl] aminostyryl] naphthalene-1,5-dicarbonytolyl (BSN-BCN). Also, a film thickness of the red light emitting layer 9 - 3 r is set within the range of 10 to 100 nm.
- the green light emitting layer 9 - 3 g of the green light emitting element 5 g is formed by mixing Alq3 with 3 Vol % coumarin 6. Also, a film thickness of the green light emitting layer 9 - 3 g is set within the range of 10 to 100 nm.
- the blue light emitting layer 9 - 3 b of the blue light emitting element 5 b for example, is made of spiro6 ⁇ . Also, a film thickness of the blue light emitting layer 9 - 3 b is set within the range of 10 to 100 nm.
- the electron transporting layer 9 - 4 formed over the red light emitting layer 9 - 3 r, the green light emitting layer 9 - 3 g, and the blue light emitting layer 9 - 3 b having the respective structures described above is provided for the purpose of enhancing the efficiencies of transporting the electrons to the light emitting layers 9 - 3 r, 9 - 3 g and 9 - 3 b, respectively.
- the electron transporting layer 9 - 4 is provided as being common to the pixels.
- Such an electron transporting layer 9 - 4 is made of a general electron transporting material.
- the electron transporting layer 9 - 4 is made of 8-hydroxyquinoline aluminum (Alq3), and a film thickness thereof is set within the range of 5 to 300 nm.
- the light emission functioning layer 9 is composed of the hole injecting layer 9 - 1 , the hole transporting layer 9 - 2 , the film thickness adjusting layer 9 - 2 ′, the light emitting layer 9 - 3 r, 9 - 3 g or 9 - 3 b, and the electron transporting layer 9 - 4 .
- the layers other than the light emitting layer 9 - 3 may be provided when necessary.
- an electron injecting layer may also be provided on the electron transporting layer 9 - 4 as may be necessary.
- the electron injecting layer for example, is made of LiF, Li 2 O or the like.
- the cathode 11 provided on the light emission functioning layer 9 is structured in the form of a half mirror composed of the semitransmissive-semireflecting electrode.
- a film thickness of the cathode 11 is set within the range of 5 to 50 nm.
- a simple substance of a metallic element such as aluminum (Al), magnesium (Mg), calcium (Ca) or sodium (Na) or an alloy thereof is given as the material of which such a cathode 11 is made.
- an alloy (AlLi alloy) of aluminum (Al) and lithium (Li) is preferably given as the material of which such a cathode 11 is made.
- the light emitting elements 5 r, 5 g and 5 b including the light emission functioning layer 9 having the light emitting layer 9 - 3 held between the corresponding one of the anodes (mirrors) 7 and the cathode (half mirror) 11 are covered with a protective film (not shown) made of silicon nitride (SiNx). Also, a sealing substrate made of a glass or the like is stuck to the entire surface of the protective film through an adhesive layer, thereby sealing the light emitting elements 5 r, 5 g and 5 b.
- the red, green and blue lights having the respective wavelengths emitted from the light emitting layers 9 - 3 r, 9 - 3 g and 9 - 3 b of the light emitting elements 5 r, 5 g and 5 b are resonated between the corresponding ones of the anodes (mirrors) 7 and the cathode (half mirror) 11 to be extracted from the cathode (half mirror) 11 .
- the introduction of such resonator structures results in that half bandwidths of the spectra of the red, green and blue lights extracted from the light emitting elements 5 r, 5 g and 5 b are reduced, thereby making it possible to increase the respective peak intensities.
- the color purities can be enhanced to increase the luminance efficiencies.
- the outside lights made incident from the cathode (half mirror) 11 side can be attenuated through a multiple interference.
- the reflectivities of the outside lights in the respective organic EL elements can be made very small by the combination with a color filter (not shown).
- the cavity orders m of the cavity structures of the red light emitting element 5 r, the green light emitting element 5 g, and the blue light emitting element 5 b are set to 0, 0 and 1, respectively.
- the total film thickness (corresponding to the optical distance Lb) of the light emission functioning layer 9 in the blue light emitting element 5 b can be increased to the same degree as that in each of the cases of the red light emitting element 5 r and the green light emitting element 5 g while there are maintained the view angle characteristics of the red light emitted from the red light emitting element 5 r, and the green light emitted from the green light emitting element 5 g. Therefore, it becomes possible to suppress the occurrence of the vanishing points in all the light emitting elements 5 r, 5 g and 5 b.
- the layers constituting the light emission functioning layer 9 other than the red light emitting layer 9 - 3 r, the green light emitting layer 9 - 3 g and the blue light emitting layer 9 - 3 b, and the film thickness adjusting layer 9 - 2 ′ are made the common layer in the light emitting elements 5 r, 5 g and 5 b.
- FIG. 2 is a cross sectional view of a main portion explaining a display device according to a second embodiment of the present invention.
- a display device lb of the second embodiment shown in FIG. 2 is different from the display device la of the first embodiment in that the cavity orders m of the blue light emitting element 5 b and the green light emitting element 5 g are each set to 1, and the cavity order of the red light emitting element 5 r is set to 0, and moreover the layer structure for realizing this is obtained.
- Other structures of the display device lb of the second embodiment are the same as those of the display device la of the first embodiment.
- Optical distances Lr, Lg and Lb in the light emitting elements 5 r, 5 g and 5 b in which the cavity orders m are set to 0, 1 and 1, respectively, as described above are adjusted based on the film thicknesses of the light emitting layers 9 - 3 r, 9 - 3 g and 9 - 3 b corresponding to the respective colors together with the film thickness of the film thickness adjusting layer 9 - 2 ′ similarly to the case of the first embodiment.
- the film thickness adjusting layer 9 - 2 ′ is formed in a pattern as a common layer to the green light emitting layer 5 g and the blue light emitting element 5 b.
- the introduction of the resonator structures results in that it is possible to enhance the color purities of the red, green and blue lights extracted from the light emitting elements 5 r, 5 g and 5 b, thereby increasing the luminance efficiencies, respectively.
- the cavity orders m of the cavity structures of the light emitting elements 5 r, 5 g and 5 b are set to 0, 1 and 1, respectively.
- the total film thickness (corresponding to the optical distance Lb, Lg) of each of the light emission functioning layers 9 in the blue light emitting element 5 b and the green light emitting element 5 g can be increased to the same degree or more as that in the case of the total film thickness of the red light emitting element 5 r while there is maintained the view angle characteristics of the red light extracted from the red light emitting element 5 r. Therefore, it becomes possible to suppress the occurrence of the vanishing points in all the light emitting elements 5 r, 5 g and 5 b.
- the layers constituting the light emission functioning layer 9 other than the red light emitting layer 9 - 3 r, the green light emitting layer 9 - 3 g and the blue light emitting layer 9 - 3 b, and the film thickness adjusting layer 9 - 2 ′ are made the common layer in the light emitting elements 5 r, 5 g and 5 b.
- the view angle characteristics of white which is obtained by synthesizing the emitted lights corresponding to the respective colors, and which is especially, easily visualized in terms of the visual feature of a human being similarly to the case of the first embodiment.
- FIG. 3 is a cross sectional view of a main portion explaining a display device according to a third embodiment of the present invention.
- a display device 1 c of the third embodiment shown in FIG. 3 is different from the display device 1 a of the first embodiment in that the cavity orders m of the light emitting elements 5 r, 5 g and 5 b, corresponding to the respective colors, including the blue light emitting element 5 b are each set to 1, and moreover the layer structure for realizing this is obtained.
- Other structures of the display device 1 c of the third embodiment are the same as those of the display device 1 a of the first embodiment.
- Optical distances Lr, Lg and Lb in the light emitting elements 5 r, 5 g and 5 b in which the cavity orders m are set to 1, 1 and 1, respectively, as described above are adjusted based on film thicknesses of light emitting layers 9 - 3 r, 9 - 3 g and 9 - 3 b corresponding to the respective colors.
- a film thickness adjusting layer 9 - 2 ′ is formed in a pattern as a common layer to the red light emitting layer 5 r and the green light emitting element 5 g.
- the introduction of the resonator structures results in that it is possible to enhance the color purities of the red, green and blue lights extracted from the light emitting elements 5 r, 5 g and 5 b, thereby increasing the luminance efficiencies, respectively.
- the cavity orders m of the cavity structures of the light emitting elements 5 r, 5 g and 5 b are set to 1, 1 and 1, respectively.
- the total film thickness (corresponding to the optical distance) of the light emission functioning layer 9 can be increased while the reduction of the view angle characteristics of the red, green and blue lights extracted from the light emitting elements 5 r, 5 g and 5 b, respectively, is kept to the minimum. Therefore, it becomes possible to more reliably suppress the occurrence of the vanishing points in all the light emitting elements 5 r, 5 g and 5 b.
- the layers constituting the light emission functioning layer 9 other than the red light emitting layer 9 - 3 r, the green light emitting layer 9 - 3 g and the blue light emitting layer 9 - 3 b, and the film thickness adjusting layer 9 - 2 ′ are made the common layer in the light emitting element 5 r, 5 g and 5 b.
- the view angle characteristics of white which is obtained by synthesizing the emitted lights corresponding to the respective colors, and which is especially, easily visualized in terms of the visual feature of a human being similarly to the case of the first embodiment.
- the film thickness adjusting layer 9 - 2 ′ made of the hole transporting material is provided in a part of the light emitting elements.
- the film thickness adjusting layer is by no means limited to one made of the hole transporting material.
- the film thickness adjusting layer may be formed in any of the layers constituting the light emission functioning layer 9 .
- the film thickness adjusting layer has to be disposed adjacent to the same material layer as that previously used as the film thickness adjusting layer.
- the film thickness of the light emission functioning layer 9 becoming the cavity portion can be adjusted only based on the light emitting layers 9 - 3 r, 9 - 3 g and 9 - 3 b, it is unnecessary to provide the film thickness adjusting layer.
- each of the anodes 7 is used as the reflecting electrode (mirror), and the cathode 11 is used as the semitransmissive-semireflecting electrode (half mirror).
- the present invention is generally applied to the light emitting element having the structure in which the light emission functioning layer becoming the cavity portion is held between the reflecting electrode (mirror) and the semitransmissive-semireflecting electrode (half mirror).
- each of the anodes 7 is used as the semitransmissive-semireflecting electrode (half mirror), and the cathode 11 is used as the reflecting electrode (mirror) as long as the lamination order of the layers constituting the light emission functioning layer between each of the anodes and the cathode is the same as that of each of the first to third embodiments.
- FIG. 4 is a circuit diagram, partly in block, showing an example of a circuit configuration of the display device of the first, second or third embodiment of the present invention.
- a display region 3 a and a peripheral region 3 b thereof are provided in the substrate 3 constituting the display device 1 a, 1 b or 1 c.
- a plurality of scanning lines 41 and a plurality of signal lines 43 are wired horizontally and vertically, respectively.
- pixels are provided so as to correspond to intersection portions between the plurality of scanning lines 41 and the plurality of signal lines 43 , respectively, thereby structuring a pixel array portion.
- a scanning line drive circuit 45 and a signal line drive circuit 47 are disposed in the peripheral region 3 b. In this case, the scanning line drive circuit 45 scans and drives the scanning lines 41 , and the signal line drive circuit 47 supplies a video signal (that is, an input signal) corresponding to luminance information to the signal lines 43 .
- a pixel circuit provided in each of the intersection portions between the scanning lines 41 and the signal lines 43 is composed of a thin film transistor Tr 1 for switching, a thin film transistor Tr 2 for driving, a hold capacitor Cs, and an organic electroluminescence (EL) element EL.
- Tr 1 for switching
- Tr 2 for driving
- a hold capacitor Cs for holding capacitor
- EL element EL organic electroluminescence
- the light emitting element 5 r, 5 g or 5 b described above is used as the organic EL element EL.
- the video signal written from the corresponding one of the signal lines 43 to the pixel is held in the hold capacitor Cs through the thin film transistor Tr 1 for switching in accordance with the driving operation by the scanning line drive circuit 45 .
- a current corresponding to an amount of video signal held in the hold capacitor Cs is supplied from the thin film transistor Tr 2 for driving to the organic EL element EL.
- the organic EL element EL emits a light with a luminance corresponding to the current value.
- the thin film transistor Tr 2 for driving, and the hold capacitor Cs are connected to a common power source supply line (Vcc) 49 .
- the configuration of the pixel circuit as described above is merely an example, and thus the pixel circuit may be configured by providing a capacitor within the pixel circuit when necessary, and moreover by providing a plurality of transistors.
- a necessary drive circuit is added to the peripheral region lb in correspondence to change of the pixel circuit.
- the display device includes module shaped one having a sealed structure as shown in FIG. 5 .
- a display module which includes a sealing portion 51 provided so as to surround a display region 3 a as a pixel array portion, and which is formed by being stuck to a counter portion (a sealing substrate 52 ) made of a transparent glass or the like by using the sealing portion 51 as an adhesive agent.
- a color filter, a protective film, a light shielding film, and the like may be formed on this transparent sealing substrate 52 .
- the substrate 3 as the display module having the display region 3 a formed therein may be provided with a flexible printed board 53 through which a signal or the like is inputted/outputted to/from the display region (pixel array portion) 3 a from/to the outside.
- the display devices, described above, according to an embodiment of the present invention can applied to display devices, of electronic apparatuses in all the fields, in each of which a video signal inputted to the electronic apparatus, or a video signal generated in the electronic apparatus is displayed in the form of an image or a video image.
- These electronic apparatuses are typified by various electronic apparatuses, shown in FIGS. 6 to 10G , such as a digital camera, a notebook-size personal computer, mobile terminal equipment such as a mobile phone, and a video camera.
- FIGS. 6 to 10G such as a digital camera, a notebook-size personal computer, mobile terminal equipment such as a mobile phone, and a video camera.
- FIG. 6 is a perspective view showing a television set to which an embodiment of the present invention is applied.
- the television set according to this example of application includes an image display screen portion 101 composed of a front panel 102 , a filter glass 103 , and the like. Also, the television set is manufactured by using the display device according to an embodiment of the present invention as the image display screen portion 101 .
- FIGS. 7A and 7B are respectively perspective views showing a digital camera to which an embodiment of the present invention is applied.
- FIG. 7A is a perspective view when the digital camera is viewed from a front side
- FIG. 7B is a perspective view when the digital camera is viewed from a back side.
- the digital camera according to this example of application includes a light emitting portion 111 for flash, a display portion 112 , a menu switch 113 , a shutter button 114 , and the like.
- the digital camera is manufactured by using the display device according to an embodiment of the present invention as the display portion 112 .
- FIG. 8 is a perspective view showing a notebook-size personal computer to which an embodiment of the present invention is applied.
- the notebook-size personal computer according to this example of application includes a main body 121 , a keyboard 122 which is manipulated when characters or the like are inputted, a display portion 123 for displaying thereon an image, and the like.
- the notebook-size personal computer is manufactured by using the display device according to an embodiment of the present invention as the display portion 123 .
- FIG. 9 is a perspective view showing a video camera to which an embodiment of the present invention is applied.
- the video camera according to this example of application includes a main body portion 131 , a lens 132 which captures an image of a subject and which is provided on a side surface directed forward, a start/stop switch 133 which is manipulated when an image of a subject is captured, a display portion 134 , and the like.
- the video camera is manufactured by using the display device according to an embodiment of the present invention as the display portion 134 .
- FIGS. 10A to 10G are respectively views showing mobile terminal equipment, for example, a mobile phone to which an embodiment of the present invention is applied.
- FIG. 10A is a front view in an open state of the mobile phone
- FIG. 10B is a side view in the open state of the mobile phone
- FIG. 10C is a front view in a close state of the mobile phone
- FIG. 10D is a left side view of the mobile phone
- FIG. 10E is a right side view of the mobile phone
- FIG. 10F is a top plan view of the mobile phone
- FIG. 10G is a bottom view of the mobile phone.
- the mobile phone according to this example of application includes an upper chassis 141 , a lower chassis 142 , a connection portion (a hinge portion in this case) 143 , a display portion 144 , a sub-display portion 145 , a picture light 146 , a camera 147 , and the like.
- the mobile phone is manufactured by using the display device according to an embodiment of the present invention as the display portion 144 or the sub-display portion 145 .
- the display device la of the first embodiment previously described with reference to FIG. 1 was manufactured.
- the film thicknesses of the layers constituting the light emission functioning layer 9 are set so that the cavity orders m of the light emitting elements 5 r, 5 g and 5 b become 0, 0 and 1, respectively, by using the materials exemplified in the first embodiment.
- Example 1 Film thickness (nm) Film Hole Hole thickness Light Electron Total Cavity injecting transporting adjusting emitting transporting film order layer layer layer layer layer thickness m 9-1 9-2 9-2′ 9-3 9-4 (nm) Red 0 20 25 — 50 25 120 (R) Green 0 — 30 100 (G) Blue 1 100 26 196 (B)
- the hole injecting layer 9 - 1 , the hole transporting layer 9 - 2 , the film thickness adjusting layer 9 - 2 ′, the light emitting layer 9 - 3 , and the electron transporting layer 9 - 4 shown in TABLE 1 are deposited by utilizing a vacuum evaporation method.
- the film thickness adjusting layer 9 - 2 ′ of the blue light emitting element 5 b, and the light emitting layers 9 - 3 r, 9 - 3 g and 9 - 3 b are deposited in a pattern by using an evaporation mask.
- the hole injecting layer 9 - 1 , the hole transporting layer 9 - 2 , and the electron transporting layer 9 - 4 are collectively deposited as the common layer.
- the film thicknesses of the layers constituting the light emission functioning layer 9 are set so that the cavity orders m of the light emitting elements 5 r, 5 g and 5 b became 0, 0 and 1, respectively.
- All the layers constituting the light emission functioning layer 9 are individually deposited every light emitting element by utilizing the vacuum evaporation method using an evaporation mask. It is noted that the film thickness adjusting layer 9 - 2 ′ provided only in the blue light emitting element 5 b in Example 1 is deposited in a pattern together with the hole transporting layer.
- the display device lb of the second embodiment previously described with reference to FIG. 2 is manufactured.
- the film thicknesses of the layers constituting the light emission functioning layer 9 are set so that the cavity orders m of the light emitting elements 5 r, 5 g and 5 b become 0, 1 and 1, respectively, by using the materials exemplified in the second embodiment.
- the layers shown in TABLE 3 are deposited by utilizing the vacuum evaporation method. Also, the film thickness adjusting layers 9 - 2 ′ of the green light emitting element 5 g and the blue light emitting element 5 b are deposited in a pattern as the common layer by using the evaporation mask. Moreover, the light emitting layers 9 - 3 r, 9 - 3 g and 9 - 3 b are deposited in a pattern by using the evaporation mask. Also, other layers are collectively deposited as the common layer.
- the film thicknesses of the layers constituting the light emission functioning layer 9 are set so that the cavity orders m of the light emitting element 5 r, 5 g and 5 b become 0, 1 and 1, respectively.
- All the layers constituting the light emission functioning layer 9 are individually deposited every light emitting element by utilizing the vacuum evaporation method using an evaporation mask. It is noted that the film thickness adjusting layer provided only in each of the green light emitting element 5 g and the blue light emitting element 5 b in Example 2 is deposited in a pattern together as the hole transporting layer in each of the element portions.
- the display device 1 c of the third embodiment previously described with reference to FIG. 3 is manufactured.
- the film thicknesses of the layers constituting the light emission functioning layer 9 are set so that the cavity orders m of the light emitting elements 5 r, 5 g and 5 b become 1, 1 and 1, respectively by using the materials exemplified in the third embodiment.
- the layers shown in TABLE 5 are deposited by utilizing the vacuum evaporation method. Also, the film thickness adjusting layers 9 - 2 ′ of the red light emitting element 5 r and the green light emitting element 5 g are deposited in a pattern as the common layer by using the evaporation mask. Moreover, the light emitting layers 9 - 3 r, 9 - 3 g and 9 - 3 b are deposited in a pattern by using the evaporation mask. Also, other layers are collectively deposited as the common layer.
- the film thicknesses of the layers constituting the light emission functioning layer 9 are set so that the cavity orders m of the light emitting elements 5 r, 5 g and 5 b become 0, 1 and 1, respectively.
- All the layers constituting the light emission functioning layer 9 are individually deposited every light emitting element by utilizing the vacuum evaporation method using an evaporation mask. It is noted that the film thickness adjusting layer provided only in each of the red light emitting element 5 r and the green light emitting element 5 g in Example 3 is deposited in a pattern together as the hole transporting layer in each of the element portions.
- a chromaticity shift, ⁇ u′v′, of the view angle of white between the view angle of 0° and the view angle of 45° is measured with respect to each of the display devices.
- TABLE 7 shows the measurement result.
- the chromaticity shift Au′v′ is a maximum value when a film thickness dispersion in the totals of the film thicknesses of the light emission functioning layers 9 of the light emitting elements 5 r, 5 g and 5 b is ⁇ 4%.
- Example 1 and Comparative Example 1, Example 2 and Comparative Example 2, and Example 3 and Comparative Example 3 in each set of which the light emission functioning layers formed so as to have the cavity structures are identical in optical design to each other. That is to say, it is understood that as long as the light emission functioning layers are identical in optical design to each other, the chromaticity shifts of the view angle of white in Examples 1 to 3 in each of which as many as possible of the common layers are provided in the light emission functioning layer by applying thereto an embodiment of the present invention are each reduced to about 1 ⁇ 2 of that of Comparative Examples 1 to 3 in each of which all the layers are individually patterned without providing the common layer in the light emission functioning layer.
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Abstract
A display device including light emitting elements corresponding to respective colors disposed on a substrate. Each of the light emitting elements corresponding to the respective colors has a cavity structure in which a light emission functioning layer including a light emitting layer is held between a reflecting electrode and a semi-transmitting electrode. The light emission functioning layer except for the light emitting layer is common to the light emitting elements corresponding to the respective colors.
Description
- This application is a continuation of U.S. patent application Ser. No. 12/268,501, filed on Nov. 11, 2008, the entirety of which is incorporated herein by reference to the extent permitted by law. The present invention claims priority to and contains subject matter related to Japanese Patent Application JP 2007-293814 filed in the Japan Patent Office on Nov. 13, 2007, the entire contents of which being incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a display device in which self-light emission type elements such as organic electroluminescence (EL) elements are disposed, and more particularly to a display device in which elements, for emitting lights having respective colors, each having a cavity structure are provided.
- 2. Description of Related Art
- In recent years, an organic electroluminescence (EL) display device using organic EL elements has been put into practical use as a display device substituted for a liquid crystal display device. The organic EL display device has a wider view angle than that in the liquid crystal display device because it is of a self-light emission type. In addition, the organic EL display device is expected to have a sufficient response to a high-speed video signal for high definition.
- Up to this day, for the organic EL element, by introducing a cavity structure, color purities of emission colors have been enhanced, and luminance efficiency has been improved, and so forth. In such a way, there has been made the attempt to control the lights emitted from light emitting layers, respectively. However, when the resonator structure is introduced into the organic EL element, light extraction efficiency in a front direction is enhanced for a displayed picture because a spectrum of a resonated light is high in peak and narrow in width. On the other hand, in this case, there is a problem that when the picture is viewed from an oblique direction, an emission wavelength is largely shifted, and emission intensity is reduced.
- In order to cope with the above problem, a structure is proposed such that an optical distance of a resonation portion is set as a minimum value so as to fall within the condition range meeting the cavity structure, which results in that by holding a peak width while a peak intensity of a spectrum of an extracted light is increased based on a cavity effect, even when a view angle is shifted, a shift amount of wavelength is reduced, and a color purity is enhanced so as to fall within a wide view angle. This structure, for example, is described in PCT Patent Publication No. WO01/39554 (pamphlet) (hereinafter referred to as Patent Document 1) and Japanese Patent Laid-Open No. 2006-147598 (hereinafter referred to as Patent Document 2).
- In addition thereto, an attempt is made such that a light emitting portion of an organic EL element having a resonator structure is formed in the form of a concave structure, and a light diffusing portion and a light deflecting portion are provided on a transparent substrate on a light-extracting side of the organic EL element, which results in that an emission direction of a light is diffused to average a directionality of the light, thereby increasing a view angle. This attempt, for example, is disclosed in Japanese Patent Laid-Open No. Hei 9-190883 (hereinafter referred to as Patent Document 3).
- However, with the structure, described in
Patent Document 1 and Patent Document 2, in which the optical distance of the cavity portion is set as the minimum value, a thickness of an organic layer in the organic EL element is reduced. The thinning of the organic layer causes a problem that pixel defects, such as a vanishing point, because an inter-electrode short-circuit generates. - In addition, with the structure described in
Patent Document 3, it is necessary to newly form the concave structure, the light diffusing layer and the light deflecting layer, which leads to cost-up. In addition, there is a new problem that an outside light is also scattered by the concave structure, the light diffusing layer and the light deflecting layer formed on the transparent substrate, so that an outside light contrast deteriorates remarkably. - Here, in a color organic EL display device in which organic EL elements for emitting lights having colors of red (R), green (G) and blue (B), respectively, are disposed on a substrate, when there is a dispersion in view angle characteristics of the organic EL elements for emitting lights having colors of R, G and B, the view angle characteristics of white is generally deteriorated. In other words, even when the view angle characteristics of the organic EL element are improved every color, it may be impossible to enhance the view angle characteristics of white as long as there is the dispersion in the view angle characteristics of the colors.
- In the light of the foregoing, it is therefore desirable to provide a display device which is capable of reducing pixel defects of organic EL elements, and enhancing view angle characteristics of white which is easily visualized in terms of a visual feature of a human being without increasing a cost in a structure in which the organic EL elements, for emitting lights having the respective colors, each having a resonator structure are disposed.
- In order to attain the desire described above, according to an embodiment of the present invention, there is provided a display device having light emitting elements corresponding to respective colors disposed on a substrate. Each of the light emitting elements corresponding to the respective colors has a cavity structure in which a light emission functioning layer including a light emitting layer is held between a reflecting electrode and a semitransmitting electrode. A cavity order of at least the light emitting element adapted to resonate a light, having the shortest wavelength, of the light emitting elements corresponding to the respective colors is 1, and a cavity order of each of other light emitting elements is 0. The light emission functioning layer except for the light emitting layer is common to the light emitting elements corresponding to the respective colors.
- In the display device having the structure described above, the cavity order of at least the light emitting element adapted to resonate the light, having the shortest wavelength (that is, the light emitting element having the shortest optical distance L in the cavity portion (the light emission functioning layer) when the cavity orders are identical to one another) of the light emitting elements corresponding to the respective colors and each having the cavity structure is 1, and the cavity order of each of other light emitting elements is 0. For this reason, the light emission functioning layer in at least the light emitting element having the cavity portion having the thinnest film thickness can be thickened to suppress the generation of the vanishing point while the deterioration of the view angle characteristics of the lights extracted from the light emitting elements, respectively, is suppressed. In addition thereto, the layers having the same structure and constituting the light emission functioning layer except for the light emitting layer in the light emitting elements are made the common layer. As a result, it is possible to approximate tendencies to show the dispersion in the total film thicknesses of the light emission functioning layers. Therefore, it is possible to enhance the view angle characteristics of white obtained by synthesizing the emitted lights corresponding to the respective colors.
- As set forth hereinabove, according to the display device of an embodiment of the present invention, it is possible to reduce the pixel defects of the organic EL elements, and to enhance the view angle characteristics of white which is easily visualized in terms of the visual feature of a human being without increasing the cost in the color display device in which the organic EL elements corresponding to the respective colors and each having the resonator structure are disposed.
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FIG. 1 is a cross sectional view of a main portion explaining a display device according to a first embodiment of the present invention; -
FIG. 2 is a cross sectional view of a main portion explaining a display device according to a second embodiment of the present invention; -
FIG. 3 is a cross sectional view of a main portion explaining a display device according to a third embodiment of the present invention; -
FIG. 4 is a circuit diagram, partly in block, showing an example of a circuit configuration of the display device of the first, second or third embodiment of the present invention; -
FIG. 5 is a structural view showing a module shaped display device, having a sealing structure to which an embodiment of the present invention is applied; -
FIG. 6 is a perspective view of a television set to which an embodiment of the present invention is applied; -
FIGS. 7A and 7B are respectively a perspective view of a digital camera, when viewed from a front side, to which an embodiment of the present invention is applied, and a perspective view of the digital camera, when viewed from a back side, to which an embodiment of the present invention is applied; -
FIG. 8 is a perspective view showing a notebook-size personal computer to which an embodiment of the present invention is applied; -
FIG. 9 is a perspective view showing a video camera to which an embodiment of the present invention is applied; and -
FIGS. 10A to 10G are respectively a front view of mobile terminal equipment or, for example, a mobile phone, in an open state, to which an embodiment of the present invention is applied, a side elevational view thereof, a front view thereof in a close state, a left side elevational view thereof, a right side elevational view thereof, a top plan view thereof, and a bottom view thereof. - Embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings. In the following description, there are described embodiments in each of which the present invention is applied to a display device having a structure with which organic electroluminescence (EL) elements for emitting lights having colors of red (R), green (G) and blue (B), respectively, are disposed on a substrate for the purpose of performing full-color display.
- <First Embodiment>
-
FIG. 1 is a cross sectional view of a main portion explaining a display device according to a first embodiment of the present invention. In a display device la shown in the figure,organic EL elements light emitting element 5 r, the greenlight emitting element 5 g and the bluelight emitting element 5 b are disposed in a matrix on asubstrate 3. Also, thedisplay device 1 a is structured as an upper surface emission type display device in which the lights emitted from thelight emitting elements substrate 3. - The
substrate 3 is a so-called thin film transistor (TFT) substrate obtained by disposing and forming TFT transistors (not shown) on a surface layer of a glass substrate, a silicon substrate, a plastic substrate or the like. Also, a surface of thesubstrate 3 is covered with a planarization insulating film. - Also, each of the
light emitting elements anode 7, a light emission functioninglayer 9, an electron injecting layer, and acathode 11 are laminated in this order on thesubstrate 3. Also, each of thelight emitting elements anode 7 is formed as a mirror composed of a reflecting electrode, thecathode 11 is formed as a half mirror composed of a semitransmissive-semireflecting electrode, and the light having a specific wavelength emitted from thelight emitting element - That is to say, in the red
light emitting element 5 r, an optical distance Lr of a cavity portion is adjusted so that the lights each having a color of red falling within a red waveform region are resonated in the cavity portion between the corresponding one of the anodes (mirrors) 7 and the cathode (half mirror) 11, thereby obtaining extraction efficiency at a local maximum. In addition, in the greenlight emitting element 5 g, an optical distance Lg of a cavity portion is adjusted so that the lights each having a color of green falling within a green waveform region are resonated in the cavity portion between the corresponding one of the anodes (mirrors) 7 and the cathode (half mirror) 11, thereby obtaining extraction efficiency at a local maximum. Moreover, in the bluelight emitting element 5 b, an optical distance Lb of a cavity portion is adjusted so that the lights each having a color of blue falling within a blue waveform region are resonated in the cavity portion between the corresponding one of the anodes (mirrors) 7 and the cathode (half mirror) 11, thereby obtaining extraction efficiency at a local maximum. As a result, the lights having emission colors of R, G and B are extracted from thelight emitting elements - Here, the optical distance L (Lr, Lg or Lb) of the
light emitting element -
2L/λ+Φ/2π=m (1) - where Φ (radian) is a sum of phase shifts Φ1 and Φ2 of reflected lights generated on both ends of the cavity portion, λ is a peak wavelength of a spectrum desired to be extracted, and m is a cavity order as an integral number allowing the optical distance L to be positive.
- However, in Expression (1), L and λ may have a common unit, and thus (nm), for example, is used as the common unit.
- Also, in particular, the feature of the display device la of the first embodiment is that, of the
light emitting elements light emitting element 5 b which resonates the shortest wavelength has the cavity order m of 1, and the redlight emitting element 5 r and the greenlight emitting element 5 g have each the cavity order m of 0. - The optical distances Lr, Lg and Lb in the
light emitting elements emission functioning layer 9, respectively, as will be described later. - Next, the layers constituting the
light emitting elements substrate 3 side. - Firstly, each of the
anodes 7 is structured in the form of the mirror composed of the reflecting electrode. A thickness of each of theanodes 7 in a lamination direction (hereinafter referred to as “a film thickness”), for example, has a value between 100 to 1000 nm. Thus, forming each of theanodes 7 so as to have a high reflectivity as much as possible is preferable in terms of enhancement of luminance efficiency. A simple substance of a metallic element such as chromium (Cr), gold (Au), platinum (Pt), nickel (Ni), copper (Cu), tungsten (W) or silver (Ag), or an alloy thereof, for example, is given as a material of which such ananode 7 is made. - For example, in order to allow the active matrix drive by the
display device 1 a, theanodes 7 are formed in a pattern so as to correspond to the pixels, respectively. Also, theanodes 7 are electrically connected to the TFTs through the contact holes (not shown), respectively, which are formed in an interlayer insulating film covering the surface of thesubstrate 3. - Each of the anodes (mirrors) 7 formed in a pattern so as to correspond to the pixels, respectively, is covered in a periphery thereof with an insulating
film 15 with only a central portion thereof being exposed. This insulatingfilm 15, for example, is made of either an organic insulating material such as polyimide or a photo resist, or an inorganic insulating material such as a silicon oxide. - Also, the light
emission functioning layer 9 provided on each of the anodes (mirrors) 7, for example, is composed of a hole injecting layer 9-1, a hole transporting layer 9-2, a light emitting layer 9-3, and an electron transporting layer 9-4 which are laminated in this order on the corresponding one of theanodes 7. In addition, a film thickness adjusting layer 9-2′ for adjusting the cavity order m is formed in a pattern on a part of thelight emitting elements light emitting element 5 b in this embodiment). This film thickness adjusting layer 9-2′ may be made of the same material as that of which any of the layers constituting the lightemission functioning layer 9 is made. In this embodiment, the film thickness adjusting layer 9-2′, for example, is formed, as a second hole transporting layer made of the same material as that of which the hole transporting layer 9-2 is made, between the hole transporting layer 9-2 and the blue light emitting layer 9-3 b. - The light emitting layers 9-3 for emitting the lights having the colors of R, G and B, respectively, of the layers constituting the light
emission functioning layer 9 are formed in a pattern so as to correspond to thelight emitting elements light emitting element 5 b. On the other hand, other layers, i.e., the hole injecting layer 9-1, the hole transporting layer 9-2 and the electron transporting layer 9-4 other than the light emitting layer 9-3 and the film thickness adjusting layer 9-2′ are common in structure to thelight emitting elements - Also, in the first embodiment, the optical distances Lr, Lg and Lb in the
light emitting elements light emitting elements light emitting element 5 b. - Hereinafter, the layers constituting the light
emission functioning layer 9 will be described from the anode (mirror) 7 side. - Firstly, the hole injecting layer 9-1 is a buffer layer for enhancing an efficiency of injecting the holes into the light emission functioning layer 19, and preventing occurrence of a leakage current. The hole injecting layer 9-1 is provided as being common to the pixels so as to cover the
anodes 7 and the insulatingfilm 15. Such a hole injecting layer 9-1 is made of a general hole injecting material. As an example, the hole injecting layer 9-1 is made of either 4,4′,4″-tris (3-methylphenylphenylamino) triphenylamine (m-MTDATA), or 4, 4′, 4″-tris (2-naphtylphenylamino) triphenylamine (2-TNATA). A film thickness of such a hole injecting layer 9-1, for example, is set within the range of 5 to 300 nm. - Next, the hole transporting layer 9-2 is provided for the purpose of enhancing an efficiency of transporting the holes to the light emitting layer 9-3. The hole transporting layer 9-2 is provided as being common to the pixels on the hole injecting layer 9-1. Such a hole transporting layer 9-2 is made of a general hole transporting material. For example, the hole transporting layer 9-2 is made of bis [(N-naphthyl)-N-phenyl] benzidine (α-NPD). A film thickness of such a hole transporting layer 9-2, for example, is set within the range of 5 to 300 nm.
- It is noted that the hole injecting layer 9-1 and hole transporting layer 9-2 described above may have lamination structures, respectively, each of which is composed of a plurality of layers.
- In addition, the film thickness adjusting layer 9-2′ provided only in the blue
light emitting element 5 b may be made of the same material as that of which the hole transporting layer 9-2 is made. A film thickness of the film thickness adjusting layer 9-2′ is set so that the bluelight emitting element 5 b has the cavity order m of 1. It is noted that the film thickness adjusting layer 9-2′ made of such a hole transporting material may also be provided between the hole transporting layer 9-2 and the hole injecting layer 9-1. - The light emitting layer 9-3 is a layer in which the holes injected from the
anode 7 side and the electrons injected from thecathode 11 side are re-combined with each other to emit the lights. In this embodiment, the red light emitting layer 9-3 r for emitting red lights is provided in the redlight emitting element 5 r. The green light emitting layer 9-3 g for emitting green lights is provided in the greenlight emitting element 5 g. Also, the blue light emitting layer 9-3 b for emitting blue lights is provided in the bluelight emitting element 5 b. - The light emitting layers 9-3 r, 9-3 g and 9-3 b are formed in a pattern so as to correspond to the pixels, respectively, in a state of perfectly infilling opening windows formed in the insulating
film 15. Here, in thelight emitting elements - The red light emitting layer 9-3 r of the red
light emitting element 5 r, for example, is made of a material obtained by mixing 8-quinolinol aluminum complex (Alq3) with 40 Vol % 2,6-bis [4-[N-(4-methoxyphenyl)-N-phenyl] aminostyryl] naphthalene-1,5-dicarbonytolyl (BSN-BCN). Also, a film thickness of the red light emitting layer 9-3 r is set within the range of 10 to 100 nm. - The green light emitting layer 9-3 g of the green
light emitting element 5 g, for example, is formed by mixing Alq3 with 3 Vol % coumarin 6. Also, a film thickness of the green light emitting layer 9-3 g is set within the range of 10 to 100 nm. - The blue light emitting layer 9-3 b of the blue
light emitting element 5 b, for example, is made of spiro6Φ. Also, a film thickness of the blue light emitting layer 9-3 b is set within the range of 10 to 100 nm. - Also, the electron transporting layer 9-4 formed over the red light emitting layer 9-3 r, the green light emitting layer 9-3 g, and the blue light emitting layer 9-3 b having the respective structures described above is provided for the purpose of enhancing the efficiencies of transporting the electrons to the light emitting layers 9-3 r, 9-3 g and 9-3 b, respectively. Also, the electron transporting layer 9-4 is provided as being common to the pixels. Such an electron transporting layer 9-4 is made of a general electron transporting material. As an example, the electron transporting layer 9-4 is made of 8-hydroxyquinoline aluminum (Alq3), and a film thickness thereof is set within the range of 5 to 300 nm.
- The light
emission functioning layer 9 is composed of the hole injecting layer 9-1, the hole transporting layer 9-2, the film thickness adjusting layer 9-2′, the light emitting layer 9-3 r, 9-3 g or 9-3 b, and the electron transporting layer 9-4. - It is noted that in the light
emission functioning layer 9, the layers other than the light emitting layer 9-3 may be provided when necessary. Moreover, an electron injecting layer may also be provided on the electron transporting layer 9-4 as may be necessary. The electron injecting layer, for example, is made of LiF, Li2O or the like. - Also, the
cathode 11 provided on the lightemission functioning layer 9 is structured in the form of a half mirror composed of the semitransmissive-semireflecting electrode. A film thickness of thecathode 11 is set within the range of 5 to 50 nm. A simple substance of a metallic element such as aluminum (Al), magnesium (Mg), calcium (Ca) or sodium (Na) or an alloy thereof is given as the material of which such acathode 11 is made. Of them, an alloy (MgAg alloy) of magnesium (Mg) and silver (Ag), or an alloy (AlLi alloy) of aluminum (Al) and lithium (Li) is preferably given as the material of which such acathode 11 is made. - The
light emitting elements emission functioning layer 9 having the light emitting layer 9-3 held between the corresponding one of the anodes (mirrors) 7 and the cathode (half mirror) 11 are covered with a protective film (not shown) made of silicon nitride (SiNx). Also, a sealing substrate made of a glass or the like is stuck to the entire surface of the protective film through an adhesive layer, thereby sealing thelight emitting elements - With the
display device 1 a structured in the manner described above, the red, green and blue lights having the respective wavelengths emitted from the light emitting layers 9-3 r, 9-3 g and 9-3 b of thelight emitting elements light emitting elements - In particular, in the display device la of the first embodiment, the cavity orders m of the cavity structures of the red
light emitting element 5 r, the greenlight emitting element 5 g, and the bluelight emitting element 5 b are set to 0, 0 and 1, respectively. As a result, the total film thickness (corresponding to the optical distance Lb) of the lightemission functioning layer 9 in the bluelight emitting element 5 b can be increased to the same degree as that in each of the cases of the redlight emitting element 5 r and the greenlight emitting element 5 g while there are maintained the view angle characteristics of the red light emitted from the redlight emitting element 5 r, and the green light emitted from the greenlight emitting element 5 g. Therefore, it becomes possible to suppress the occurrence of the vanishing points in all thelight emitting elements - Moreover, the layers constituting the light
emission functioning layer 9, other than the red light emitting layer 9-3 r, the green light emitting layer 9-3 g and the blue light emitting layer 9-3 b, and the film thickness adjusting layer 9-2′ are made the common layer in thelight emitting elements emission functioning layers 9 in thelight emitting elements - <Second Embodiment>
-
FIG. 2 is a cross sectional view of a main portion explaining a display device according to a second embodiment of the present invention. A display device lb of the second embodiment shown inFIG. 2 is different from the display device la of the first embodiment in that the cavity orders m of the bluelight emitting element 5 b and the greenlight emitting element 5 g are each set to 1, and the cavity order of the redlight emitting element 5 r is set to 0, and moreover the layer structure for realizing this is obtained. Other structures of the display device lb of the second embodiment are the same as those of the display device la of the first embodiment. - Optical distances Lr, Lg and Lb in the
light emitting elements light emitting layer 5 g and the bluelight emitting element 5 b. - Even in the display device lb having such a structure, the introduction of the resonator structures results in that it is possible to enhance the color purities of the red, green and blue lights extracted from the
light emitting elements - In particular, in the display device lb of the second embodiment, the cavity orders m of the cavity structures of the
light emitting elements emission functioning layers 9 in the bluelight emitting element 5 b and the greenlight emitting element 5 g can be increased to the same degree or more as that in the case of the total film thickness of the redlight emitting element 5 r while there is maintained the view angle characteristics of the red light extracted from the redlight emitting element 5 r. Therefore, it becomes possible to suppress the occurrence of the vanishing points in all thelight emitting elements - Moreover, the layers constituting the light
emission functioning layer 9, other than the red light emitting layer 9-3 r, the green light emitting layer 9-3 g and the blue light emitting layer 9-3 b, and the film thickness adjusting layer 9-2′ are made the common layer in thelight emitting elements - <Third Embodiment>
-
FIG. 3 is a cross sectional view of a main portion explaining a display device according to a third embodiment of the present invention. Adisplay device 1 c of the third embodiment shown inFIG. 3 is different from thedisplay device 1 a of the first embodiment in that the cavity orders m of thelight emitting elements light emitting element 5 b are each set to 1, and moreover the layer structure for realizing this is obtained. Other structures of thedisplay device 1 c of the third embodiment are the same as those of thedisplay device 1 a of the first embodiment. - Optical distances Lr, Lg and Lb in the
light emitting elements light emitting layer 5 r and the greenlight emitting element 5 g. - Even in the
display device 1 c having such a structure, the introduction of the resonator structures results in that it is possible to enhance the color purities of the red, green and blue lights extracted from thelight emitting elements - In particular, in the
display device 1 c of the third embodiment, the cavity orders m of the cavity structures of thelight emitting elements emission functioning layer 9 can be increased while the reduction of the view angle characteristics of the red, green and blue lights extracted from thelight emitting elements light emitting elements - Moreover, the layers constituting the light
emission functioning layer 9, other than the red light emitting layer 9-3 r, the green light emitting layer 9-3 g and the blue light emitting layer 9-3 b, and the film thickness adjusting layer 9-2′ are made the common layer in thelight emitting element - It is noted that in each of the first to third embodiments described above, the description has been given with respect to the structure in which the film thickness adjusting layer 9-2′ made of the hole transporting material is provided in a part of the light emitting elements. However, the film thickness adjusting layer is by no means limited to one made of the hole transporting material. Thus, the film thickness adjusting layer may be formed in any of the layers constituting the light
emission functioning layer 9. In this case, the film thickness adjusting layer has to be disposed adjacent to the same material layer as that previously used as the film thickness adjusting layer. In addition, when the film thickness of the lightemission functioning layer 9 becoming the cavity portion can be adjusted only based on the light emitting layers 9-3 r, 9-3 g and 9-3 b, it is unnecessary to provide the film thickness adjusting layer. - In addition, in each of the first to third embodiments, the description has been given with respect to the structure in which each of the
anodes 7 is used as the reflecting electrode (mirror), and thecathode 11 is used as the semitransmissive-semireflecting electrode (half mirror). However, the present invention is generally applied to the light emitting element having the structure in which the light emission functioning layer becoming the cavity portion is held between the reflecting electrode (mirror) and the semitransmissive-semireflecting electrode (half mirror). For this reason, for example, a structure may also be adopted such that each of theanodes 7 is used as the semitransmissive-semireflecting electrode (half mirror), and thecathode 11 is used as the reflecting electrode (mirror) as long as the lamination order of the layers constituting the light emission functioning layer between each of the anodes and the cathode is the same as that of each of the first to third embodiments. - <Circuit Configuration of Display Device>
-
FIG. 4 is a circuit diagram, partly in block, showing an example of a circuit configuration of the display device of the first, second or third embodiment of the present invention. As shown in the figure, adisplay region 3 a and aperipheral region 3 b thereof are provided in thesubstrate 3 constituting thedisplay device scanning lines 41 and a plurality ofsignal lines 43 are wired horizontally and vertically, respectively. Also, pixels are provided so as to correspond to intersection portions between the plurality ofscanning lines 41 and the plurality ofsignal lines 43, respectively, thereby structuring a pixel array portion. In addition, a scanningline drive circuit 45 and a signalline drive circuit 47 are disposed in theperipheral region 3 b. In this case, the scanningline drive circuit 45 scans and drives thescanning lines 41, and the signalline drive circuit 47 supplies a video signal (that is, an input signal) corresponding to luminance information to the signal lines 43. - A pixel circuit provided in each of the intersection portions between the
scanning lines 41 and the signal lines 43, for example, is composed of a thin film transistor Tr1 for switching, a thin film transistor Tr2 for driving, a hold capacitor Cs, and an organic electroluminescence (EL) element EL. In this case, thelight emitting element - In the
display device signal lines 43 to the pixel is held in the hold capacitor Cs through the thin film transistor Tr1 for switching in accordance with the driving operation by the scanningline drive circuit 45. A current corresponding to an amount of video signal held in the hold capacitor Cs is supplied from the thin film transistor Tr2 for driving to the organic EL element EL. Also, the organic EL element EL emits a light with a luminance corresponding to the current value. It is noted that the thin film transistor Tr2 for driving, and the hold capacitor Cs are connected to a common power source supply line (Vcc) 49. - It is noted that the configuration of the pixel circuit as described above is merely an example, and thus the pixel circuit may be configured by providing a capacitor within the pixel circuit when necessary, and moreover by providing a plurality of transistors. In addition, a necessary drive circuit is added to the peripheral region lb in correspondence to change of the pixel circuit.
- It is noted that the display device according to an embodiment of the present invention includes module shaped one having a sealed structure as shown in
FIG. 5 . For example, a display module which includes a sealingportion 51 provided so as to surround adisplay region 3 a as a pixel array portion, and which is formed by being stuck to a counter portion (a sealing substrate 52) made of a transparent glass or the like by using the sealingportion 51 as an adhesive agent. A color filter, a protective film, a light shielding film, and the like may be formed on thistransparent sealing substrate 52. It is noted that thesubstrate 3 as the display module having thedisplay region 3 a formed therein may be provided with a flexible printedboard 53 through which a signal or the like is inputted/outputted to/from the display region (pixel array portion) 3 a from/to the outside. - <Examples of Application>
- The display devices, described above, according to an embodiment of the present invention can applied to display devices, of electronic apparatuses in all the fields, in each of which a video signal inputted to the electronic apparatus, or a video signal generated in the electronic apparatus is displayed in the form of an image or a video image. These electronic apparatuses are typified by various electronic apparatuses, shown in
FIGS. 6 to 10G , such as a digital camera, a notebook-size personal computer, mobile terminal equipment such as a mobile phone, and a video camera. Hereinafter, examples of electronic apparatuses to each of which an embodiment of the present invention is applied will be described. -
FIG. 6 is a perspective view showing a television set to which an embodiment of the present invention is applied. The television set according to this example of application includes an imagedisplay screen portion 101 composed of afront panel 102, afilter glass 103, and the like. Also, the television set is manufactured by using the display device according to an embodiment of the present invention as the imagedisplay screen portion 101. -
FIGS. 7A and 7B are respectively perspective views showing a digital camera to which an embodiment of the present invention is applied.FIG. 7A is a perspective view when the digital camera is viewed from a front side, andFIG. 7B is a perspective view when the digital camera is viewed from a back side. The digital camera according to this example of application includes alight emitting portion 111 for flash, adisplay portion 112, amenu switch 113, ashutter button 114, and the like. The digital camera is manufactured by using the display device according to an embodiment of the present invention as thedisplay portion 112. -
FIG. 8 is a perspective view showing a notebook-size personal computer to which an embodiment of the present invention is applied. The notebook-size personal computer according to this example of application includes amain body 121, akeyboard 122 which is manipulated when characters or the like are inputted, adisplay portion 123 for displaying thereon an image, and the like. The notebook-size personal computer is manufactured by using the display device according to an embodiment of the present invention as thedisplay portion 123. -
FIG. 9 is a perspective view showing a video camera to which an embodiment of the present invention is applied. The video camera according to this example of application includes amain body portion 131, alens 132 which captures an image of a subject and which is provided on a side surface directed forward, a start/stop switch 133 which is manipulated when an image of a subject is captured, adisplay portion 134, and the like. The video camera is manufactured by using the display device according to an embodiment of the present invention as thedisplay portion 134. -
FIGS. 10A to 10G are respectively views showing mobile terminal equipment, for example, a mobile phone to which an embodiment of the present invention is applied.FIG. 10A is a front view in an open state of the mobile phone,FIG. 10B is a side view in the open state of the mobile phone,FIG. 10C is a front view in a close state of the mobile phone,FIG. 10D is a left side view of the mobile phone,FIG. 10E is a right side view of the mobile phone,FIG. 10F is a top plan view of the mobile phone, andFIG. 10G is a bottom view of the mobile phone. The mobile phone according to this example of application includes anupper chassis 141, alower chassis 142, a connection portion (a hinge portion in this case) 143, adisplay portion 144, asub-display portion 145, a picture light 146, acamera 147, and the like. The mobile phone is manufactured by using the display device according to an embodiment of the present invention as thedisplay portion 144 or thesub-display portion 145. - Structures of concrete examples of the present invention, and comparative examples, and evaluation results thereof will be described below.
- The display device la of the first embodiment previously described with reference to
FIG. 1 was manufactured. As shown in TABLE 1, the film thicknesses of the layers constituting the lightemission functioning layer 9 are set so that the cavity orders m of thelight emitting elements -
TABLE 1 Example 1 Film thickness (nm) Film Hole Hole thickness Light Electron Total Cavity injecting transporting adjusting emitting transporting film order layer layer layer layer layer thickness m 9-1 9-2 9-2′ 9-3 9-4 (nm) Red 0 20 25 — 50 25 120 (R) Green 0 — 30 100 (G) Blue 1 100 26 196 (B) - The hole injecting layer 9-1, the hole transporting layer 9-2, the film thickness adjusting layer 9-2′, the light emitting layer 9-3, and the electron transporting layer 9-4 shown in TABLE 1 are deposited by utilizing a vacuum evaporation method. The film thickness adjusting layer 9-2′ of the blue
light emitting element 5 b, and the light emitting layers 9-3 r, 9-3 g and 9-3 b are deposited in a pattern by using an evaporation mask. The hole injecting layer 9-1, the hole transporting layer 9-2, and the electron transporting layer 9-4 are collectively deposited as the common layer. - Similarly to the case of Example 1, as shown in TABLE 2, the film thicknesses of the layers constituting the light
emission functioning layer 9 are set so that the cavity orders m of thelight emitting elements -
TABLE 2 Comparative Example 1 Film thickness (nm) Total Cavity Hole Hole Light Electron film order injecting transporting emitting transporting thickness m layer layer layer layer (nm) Red 0 20 25 50 25 120 (R) Green 0 20 25 30 25 100 (G) Blue 1 20 125 26 25 196 (B) - All the layers constituting the light
emission functioning layer 9 are individually deposited every light emitting element by utilizing the vacuum evaporation method using an evaporation mask. It is noted that the film thickness adjusting layer 9-2′ provided only in the bluelight emitting element 5 b in Example 1 is deposited in a pattern together with the hole transporting layer. - The display device lb of the second embodiment previously described with reference to
FIG. 2 is manufactured. As shown in TABLE 3, the film thicknesses of the layers constituting the lightemission functioning layer 9 are set so that the cavity orders m of thelight emitting elements -
TABLE 3 Example 2 Film thickness (nm) Film Hole Hole thickness Light Electron Total Cavity injecting transporting adjusting emitting transporting film order layer layer layer layer layer thickness m 9-1 9-2 9-2′ 9-3 9-4 (nm) Red 0 20 25 — 50 25 120 (R) Green 1 100 80 250 (G) Blue 1 26 196 (B) - The layers shown in TABLE 3 are deposited by utilizing the vacuum evaporation method. Also, the film thickness adjusting layers 9-2′ of the green
light emitting element 5 g and the bluelight emitting element 5 b are deposited in a pattern as the common layer by using the evaporation mask. Moreover, the light emitting layers 9-3 r, 9-3 g and 9-3 b are deposited in a pattern by using the evaporation mask. Also, other layers are collectively deposited as the common layer. - Similarly to the case of Example 2, as shown in TABLE 4, the film thicknesses of the layers constituting the light
emission functioning layer 9 are set so that the cavity orders m of thelight emitting element -
TABLE 4 Comparative Example 2 Film thickness (nm) Total Cavity Hole Hole Light Electron film order injecting transporting emitting transporting thickness m layer layer layer layer (nm) Red 0 20 25 50 25 120 (R) Green 1 20 175 30 25 250 (G) Blue 1 20 125 26 25 196 (B) - All the layers constituting the light
emission functioning layer 9 are individually deposited every light emitting element by utilizing the vacuum evaporation method using an evaporation mask. It is noted that the film thickness adjusting layer provided only in each of the greenlight emitting element 5 g and the bluelight emitting element 5 b in Example 2 is deposited in a pattern together as the hole transporting layer in each of the element portions. - The
display device 1 c of the third embodiment previously described with reference toFIG. 3 is manufactured. As shown in TABLE 3, the film thicknesses of the layers constituting the lightemission functioning layer 9 are set so that the cavity orders m of thelight emitting elements -
TABLE 5 Example 3 Film thickness (nm) Film Hole Hole thickness Light Electron Total Cavity injecting transporting adjusting emitting transporting film order layer layer layer layer layer thickness m 9-1 9-2 9-2′ 9-3 9-4 (nm) Red 1 20 125 50 80 25 300 (R) Green 1 30 250 (G) Blue 1 — 26 196 (B) - The layers shown in TABLE 5 are deposited by utilizing the vacuum evaporation method. Also, the film thickness adjusting layers 9-2′ of the red
light emitting element 5 r and the greenlight emitting element 5 g are deposited in a pattern as the common layer by using the evaporation mask. Moreover, the light emitting layers 9-3 r, 9-3 g and 9-3 b are deposited in a pattern by using the evaporation mask. Also, other layers are collectively deposited as the common layer. - Similarly to the case of Example 3, as shown in TABLE 6, the film thicknesses of the layers constituting the light
emission functioning layer 9 are set so that the cavity orders m of thelight emitting elements -
TABLE 6 Comparative Example 3 Film thickness (nm) Hole Electron Total Hole trans- Light trans- film Cavity injecting porting emitting porting thickness order m layer layer layer layer (nm) Red 1 20 205 50 25 300 (R) Green 1 20 175 30 25 250 (G) Blue 1 20 125 26 25 196 (B) - All the layers constituting the light
emission functioning layer 9 are individually deposited every light emitting element by utilizing the vacuum evaporation method using an evaporation mask. It is noted that the film thickness adjusting layer provided only in each of the redlight emitting element 5 r and the greenlight emitting element 5 g in Example 3 is deposited in a pattern together as the hole transporting layer in each of the element portions. - <Evaluation Results>
- In the display devices of Examples 1 to 3, and Comparative Examples 1 to 3 manufactured in the manner described above, there is no occurrence of the vanishing point in any of the light emitting elements constituting these display devices.
- In addition, a chromaticity shift, Δu′v′, of the view angle of white between the view angle of 0° and the view angle of 45° is measured with respect to each of the display devices. TABLE 7 shows the measurement result. The chromaticity shift Au′v′ is a maximum value when a film thickness dispersion in the totals of the film thicknesses of the light
emission functioning layers 9 of thelight emitting elements -
TABLE 7 Chromaticity shift ( view angle 45°)Cavity order m Presence of Absence of Red (R) Green(G) Blue (B) common layer common layer 0 0 1 0.017 0.034 (Example 1) (Comparative Example 1) 0 1 1 0.018 0.035 (Example 2) (Comparative Example 2) 1 1 1 0.030 0.063 (Example 3) (Comparative Example 3) - As shown in TABLE 7, the following respect is understood from the measurement results with respect to Example 1 and Comparative Example 1, Example 2 and Comparative Example 2, and Example 3 and Comparative Example 3 in each set of which the light emission functioning layers formed so as to have the cavity structures are identical in optical design to each other. That is to say, it is understood that as long as the light emission functioning layers are identical in optical design to each other, the chromaticity shifts of the view angle of white in Examples 1 to 3 in each of which as many as possible of the common layers are provided in the light emission functioning layer by applying thereto an embodiment of the present invention are each reduced to about ½ of that of Comparative Examples 1 to 3 in each of which all the layers are individually patterned without providing the common layer in the light emission functioning layer.
- From the above, it is confirmed that it is possible to reduce the pixel defects of the light emitting elements, and to enhance the view angle characteristics of white which is readily visualized in terms of the visual features of a human being in the color display device in which the organic electroluminescence elements each having the cavity structure are disposed.
- It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and alterations may occur depending on design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. A display device comprising a plurality of organo-electroluminescent light emitting devices, each light emitting device have a resonance structure in which a light emission layer between upper and lower electrodes within which light can resonate, at least one of the light emitting devices has a adjusting layer to adjust the resonant structure.
2. The display device of claim 1 , wherein the light emitting devices emit light of different wavelengths.
3. The display device of claim 1 , wherein at least one light emitting device emits red light, at least one light emitting device emits blue light, and at least one light emitting device emits green light.
3. The display device of claim 1 , comprising:
a substrate; and
an insulating layer on the substrate, the insulating layer having concavities therein;
wherein,
each light emitting device corresponds to a respective concavity,
each the light emitting device has a respective portion of a light emission layer within its respective concavity,
each lower electrode is a reflecting electrode,
each upper electrode is a semi-transmitting electrode,
each respective light emission layer portion includes a respective light emitting layer, and
the light emission layer, except for the respective light emitting layers and the light adjusting layer, is common to all of the light emitting elements.
4. The display device of claim 3 , comprising red, blue and green light emission layers.
5. The display device of claim 1 , comprising:
a substrate;
an insulating layer on the substrate, the insulating layer having concavities therein, each concavity corresponding to a respective light emitting device; and
at least first, second and third light emitting elements carried on the substrate, the first, second and third light emitting elements emitting light having first, second and third wavelengths, respectively, the first wavelength being shorter than the second wavelength, the second wavelength being shorter than the third wavelength, the first, second and third light emitting elements being associated with a respective concavity in the insulating layer,
wherein,
each of the light emitting devices has a cavity structure in which a respective portion of a light emission layer is held within its respective concavity, each respective light emission layer portion being held between the upper electrode and lower electrode electrode,
each upper electrode is a semi-transmitting electrode,
each lower electrode is a reflective electrode, each respective light emission layer portion includes a respective light emitting layer,
at least the first light emitting device has an adjusting layer in its respective light layer portion, and
the light emission layer, except for the respective light emitting layers and the light adjusting layer, is common to the first, second and third light emitting devices.
6. The display device of claim 5 , wherein at least two of the first, second and third light emitting devices have adjusting layers.
7. The display device of claim 5 , wherein the light adjusting layers are a common layer between the at least two of the first, second and third light emitting devices.
8. The display device of claim 1 , wherein at least two of the light emitting devices have a an adjustment layer.
Priority Applications (1)
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US13/533,396 US20120261685A1 (en) | 2007-11-13 | 2012-06-26 | Display device |
Applications Claiming Priority (4)
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JP2007293814A JP4450051B2 (en) | 2007-11-13 | 2007-11-13 | Display device |
JP2007-293814 | 2007-11-13 | ||
US12/268,501 US8227796B2 (en) | 2007-11-13 | 2008-11-11 | Display device |
US13/533,396 US20120261685A1 (en) | 2007-11-13 | 2012-06-26 | Display device |
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US12/268,501 Continuation US8227796B2 (en) | 2007-11-13 | 2008-11-11 | Display device |
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US20120261685A1 true US20120261685A1 (en) | 2012-10-18 |
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Family Applications (3)
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US12/268,501 Expired - Fee Related US8227796B2 (en) | 2007-11-13 | 2008-11-11 | Display device |
US13/491,066 Abandoned US20120241782A1 (en) | 2007-11-13 | 2012-06-07 | Display device |
US13/533,396 Abandoned US20120261685A1 (en) | 2007-11-13 | 2012-06-26 | Display device |
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US12/268,501 Expired - Fee Related US8227796B2 (en) | 2007-11-13 | 2008-11-11 | Display device |
US13/491,066 Abandoned US20120241782A1 (en) | 2007-11-13 | 2012-06-07 | Display device |
Country Status (4)
Country | Link |
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US (3) | US8227796B2 (en) |
JP (1) | JP4450051B2 (en) |
KR (1) | KR20090049538A (en) |
CN (1) | CN101436609B (en) |
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Also Published As
Publication number | Publication date |
---|---|
US20120241782A1 (en) | 2012-09-27 |
US8227796B2 (en) | 2012-07-24 |
US20090121239A1 (en) | 2009-05-14 |
KR20090049538A (en) | 2009-05-18 |
JP4450051B2 (en) | 2010-04-14 |
CN101436609B (en) | 2013-08-14 |
CN101436609A (en) | 2009-05-20 |
JP2009123404A (en) | 2009-06-04 |
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