WO2016063846A1 - 表示装置 - Google Patents
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- WO2016063846A1 WO2016063846A1 PCT/JP2015/079502 JP2015079502W WO2016063846A1 WO 2016063846 A1 WO2016063846 A1 WO 2016063846A1 JP 2015079502 W JP2015079502 W JP 2015079502W WO 2016063846 A1 WO2016063846 A1 WO 2016063846A1
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- 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
- H10K50/131—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 with spacer layers between the electroluminescent layers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/0305—Constructional arrangements
- G02F1/0316—Electrodes
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133621—Illuminating devices providing coloured light
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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- 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
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- 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
- H10K59/32—Stacked devices having two or more layers, each emitting at different wavelengths
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133613—Direct backlight characterized by the sequence of light sources
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133621—Illuminating devices providing coloured light
- G02F1/133622—Colour sequential illumination
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133624—Illuminating devices characterised by their spectral emissions
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
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- 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
Definitions
- the present invention relates to a display device, and more particularly to a display device suitable for a field sequential method.
- a field sequential display device uses light emitting elements of multiple colors as a backlight of a liquid crystal display panel, and is configured to light up light emitting elements of each color sequentially in a time-sharing manner as the pixels of the liquid crystal display panel are driven. This has an advantage that the aperture ratio of the pixel is higher than that of the surface division.
- Patent Document 1 describes that “a field sequential liquid crystal display device includes a transmissive liquid crystal panel and a backlight disposed on the back side thereof”. “The backlight is composed of a light-emitting device including an organic EL element in which three light-emitting units of red, green, and blue are stacked on a substrate.”
- the organic electroluminescent element used for the backlight of the display device described in the cited document 1 has a configuration in which three color light emitting units are laminated. For this reason, the light extraction efficiency from the light emitting units arranged in the lower layer is not sufficient, and there is a concern about an increase in power consumption in order to obtain sufficient light emission efficiency for light emission of each color.
- an object of the present invention is to provide a field sequential display device capable of reducing power consumption while reducing the weight by using an organic electroluminescent element as a backlight.
- a display device for achieving such an object includes a light transmission type shutter element panel in which shutter elements for controlling the transmission of light are arranged in a matrix, and an organic electroluminescent element, and is superimposed on the shutter element panel.
- the organic electroluminescent element a stacked element in which each color light emitting unit is sandwiched between a plurality of electrodes, and white or each of the above colors between a pair of electrodes.
- the display device having such a configuration, it is possible to reduce the power consumption while reducing the weight by using the organic electroluminescent element for the backlight.
- FIGS. 1 to 4 are diagrams for explaining the configuration of a display device 1 according to a first embodiment to which the present invention is applied.
- the display device 1 shown in these drawings is of a so-called field sequential type, and has a configuration in which a transmissive shutter element panel 3 and a backlight panel 5 using an organic electroluminescent element are laminated.
- the configuration of the display device 1 will be described in the order of the planar configuration of the shutter element panel 3, the layer configuration of the shutter element panel 3, the planar configuration of the backlight panel 5, the layer configuration of the backlight panel 5, and the driving method of the display device 1. To do.
- FIG. 1 is a schematic plan view of a main part for explaining a planar configuration of the display device 1 according to the first embodiment.
- the shutter element panel 3 in the display device 1 shown in this figure is, for example, a liquid crystal display panel, and a liquid crystal layer is sandwiched between two substrates.
- substrate 11a) is shown as the shutter element panel 3.
- a plurality of scanning lines 13 are wired in the row direction (here horizontal direction), and a plurality of signal lines 15 are wired in the column direction (vertical direction).
- One shutter element 3a is provided for each intersection.
- a common wiring 17 is wired in parallel with the scanning line 13 on the first substrate 11a. Further, at the peripheral portion on the first substrate 11a, a scanning line driving circuit 13a that scans and drives the scanning lines 13, and a signal line driving circuit 15a that supplies a video signal (that is, an input signal) corresponding to luminance information to the signal line 15. And are arranged.
- Each shutter element 3a is provided with a shutter opening / closing circuit composed of, for example, a thin film transistor Tr and a holding capacitor Cs, and a pixel electrode 19 is connected to these opening / closing circuits.
- This open / close circuit is a so-called pixel circuit.
- the pixel electrode 19 is provided on an interlayer insulating film that covers the switching circuit, as will be described in detail later using a plan view and a cross-sectional view.
- Each thin film transistor Tr has a gate electrode connected to the scanning line 13, a source electrode connected to the signal line 15, and a drain electrode connected to the storage capacitor Cs and the pixel electrode 19.
- the thin film transistor Tr of each shutter element 3 a arranged along the scanning line 13 is connected to the gate electrode in a state where the single scanning line 13 is shared.
- the other electrode of the capacitive element Cs is connected to the common wiring 17.
- the common wiring 17 is connected to a common electrode on the second substrate side (not shown here).
- the video signal written from the signal line 15 via the thin film transistor Tr is held in the holding capacitor Cs, and a voltage corresponding to the held signal amount is supplied to each pixel electrode 19.
- the configuration of the switching circuit as described above is merely an example, and if necessary, a capacitance element may be provided in the switching circuit, or a plurality of transistors may be provided to configure the switching circuit. Further, a necessary drive circuit may be added to the peripheral region of the first substrate 11a according to the change of the switching circuit.
- the shutter element panel 3 is not limited to a liquid crystal display panel, and may be an element panel that can freely open and close an optical aperture for each pixel.
- a shutter element panel may be, for example, a MEMS shutter element panel in which a micro machine (Micro Electro Mechanical Systems: MEMS) shutter is incorporated for each pixel.
- MEMS Micro Electro Mechanical Systems
- FIG. 2 is a schematic cross-sectional view of an essential part for explaining the layer structure of the display device 1 according to the first embodiment, and corresponds to a cross section taken along the line AA ′ of FIG.
- the shutter element panel 3 has a liquid crystal layer LC sandwiched between a first substrate 11a and a second substrate 11b made of a transparent material such as a glass substrate or a plastic substrate.
- the circuit described with reference to FIG. 1 is formed on the first substrate 11a.
- a thin film transistor Tr and a capacitor element On the surface of the first substrate 11a facing the liquid crystal layer LC, a thin film transistor Tr and a capacitor element, a scanning line, a signal line, and a common wiring (not shown here) (not shown here) are provided. . These are covered with an interlayer insulating film 21.
- the pixel electrodes 19 are arrayed on the interlayer insulating film 21. Each pixel electrode 19 is made of a light-transmitting conductive material, and is connected to the drain electrode of the thin film transistor Tr through a connection hole 23 provided in the interlayer insulating film 21.
- the formation surface side of the pixel electrode 19 in the first substrate 11a on the driving side as described above is covered with an alignment film not shown here, and a liquid crystal layer LC is provided through the alignment film.
- a common electrode 25 is provided on the surface of the second substrate 11b facing the first substrate 11a via the liquid crystal layer LC toward the liquid crystal layer LC.
- the common electrode 25 is made of a light-transmitting conductive material, and is provided in the form of a solid film having a potential common to all the shutter elements 3a. Further, the surface of the second substrate 11b where the common electrode 25 is formed is covered with an alignment film not shown here, and a liquid crystal layer LC is provided through the alignment film.
- the liquid crystal layer LC provided between the alignment film on the first substrate 11 a and the alignment film on the second substrate 11 b as described above includes liquid crystal molecules that are driven by turning on / off the pixel electrodes 19.
- the layer thickness of the liquid crystal layer LC is maintained at a predetermined layer thickness (cell gap) by sandwiching a spacer (not shown) between the first substrate 11a and the second substrate 11b.
- a pair of deflecting plates (not shown) are disposed outside the first substrate 11a and the second substrate 11b, and the backlight panel 5 is disposed outside the deflecting plate on the first substrate 11a side.
- the display device 1 is configured by being arranged.
- the backlight panel 5 includes an organic electroluminescent element, and is disposed on the first substrate 11 a side in the shutter element panel 3.
- the backlight panel 5 includes a laminated element EL1 and a single-layer element EL2 on one main surface of a transparent substrate 51.
- the laminated element EL1 and the single-layer element EL2 are arranged on the surface of the transparent substrate 51 opposite to the shutter element panel 3.
- the multilayer element EL1 and the single-layer element EL2 are arranged in a stripe shape along the direction of arrangement of the shutter elements 3a in the shutter element panel 3, and, for example, are connected to the signal lines 15 provided on the shutter element panel 3. It extends in the row direction (vertical direction) along.
- the stacked element EL1 and the single layer element EL2 are alternately arranged in the row direction (vertical direction) along the scanning line 13.
- FIG. 1 shows a state in which the shutter element panel 3 and the backlight panel 5 are shifted, but a pair of stacked element EL1 and single layer element EL2 for each shutter element 3a. Are arranged in a stacked state.
- the transparent substrate 51 is connected with a light emission drive circuit 53 for driving the multilayer element EL1 and the single layer element EL2.
- the light emission driving circuit 53 includes a first electrode 55-1 to a fourth electrode 55-4 of the multilayer element EL1 and a first electrode 57-1 and a second electrode 57 of the single-layer element EL2, which will be described in detail later.
- For -2 supply the voltage to control the light emission of each light emitting unit individually.
- the backlight panel 5 includes a laminated element EL1 and a single-layer element EL2 on a surface opposite to the shutter element panel 3 in a transparent substrate 51 such as a glass substrate or a plastic substrate. And are arranged.
- the emitted light obtained by the multilayer element EL1 and the single layer element EL2 is extracted to the shutter element panel 3 side through the transparent substrate 51.
- the configuration of the multilayer element EL1 and the single layer element EL2 is as follows.
- FIG. 3 is a schematic cross-sectional configuration diagram of the multilayer element EL1.
- the multilayer element EL1 includes, for example, a first electrode 55-1, a second electrode 55-2, a third electrode 55-3, and a fourth electrode 55-4 in order from the transparent substrate 51 side. Have. Between these electrodes, light emitting units of different emission colors are sandwiched.
- a red light emitting unit 55r is sandwiched between the first electrode 55-1 and the second electrode 55-2.
- One of the first electrode 55-1 and the second electrode 55-2 functions as an anode and the other functions as a cathode with respect to the red light emitting unit 55r.
- the red light emitting unit 55r has a configuration in which red (R) emitted light hr is obtained by recombination of holes injected from the anode and electrons injected from the cathode.
- a green light emitting unit 55g is sandwiched between the second electrode 55-2 and the third electrode 55-3.
- One of the second electrode 55-2 and the third electrode 55-3 functions as an anode and the other functions as a cathode with respect to the green light emitting unit 55g.
- the green light emitting unit 55g is configured to obtain green (G) emitted light hg by recombination of holes injected from the anode and electrons injected from the cathode.
- a blue light emitting unit 55b is sandwiched between the third electrode 55-3 and the fourth electrode 55-4.
- One of the third electrode 55-3 and the fourth electrode 55-4 functions as an anode and the other functions as a cathode with respect to the blue light emitting unit 55b.
- the blue light emitting unit 55b is configured to obtain blue (B) emitted light hb by recombination of holes injected from the anode and electrons injected from the cathode.
- the electrode 55-2 and the third electrode 55-3 are configured using a light-transmitting conductive material.
- a light-transmitting conductive material examples include ITO (indium tin oxide), ZnO (zinc oxide), TiO 2 (titanium oxide), SnO 2 (tin oxide), and IZO (registered trademark: indium zinc oxide).
- ITO indium tin oxide
- ZnO zinc oxide
- TiO 2 titanium oxide
- SnO 2 titanium oxide
- IZO registered trademark: indium zinc oxide
- An oxide semiconductor such as thin film silver (Ag) having a light-transmitting property is used.
- the first electrode 55-1, the second electrode 55-2, and the third electrode 55-3 are preferably composed of a silver thin film having a low resistance but sufficient light transmission.
- a silver thin film it is preferable to provide a layer that can ensure film formation uniformity of the silver thin film, such as a nitrogen-containing layer, as the film formation underlayer.
- a layer preferably serves also as, for example, a hole injection layer or an electron injection layer as a part of the light emitting unit.
- the silver thin film is preferably used as an anode.
- the fourth electrode 55-4 is formed using a conductive material having light reflectivity.
- a conductive material having such light reflectivity a metal material such as aluminum is used, and a material considering a work function is selected and used from these materials.
- the red light emitting unit 55r, the green light emitting unit 55g, and the blue light emitting unit 55b are not limited in overall layer structure as a light emitting unit of an organic electroluminescent element.
- a configuration in which [hole injection layer / hole transport layer / light emitting layer / electron transport layer / electron injection layer] is stacked in order from the anode side is exemplified, and among these, at least an organic material is used. It is essential to have a light emitting layer.
- the hole injection layer and the hole transport layer may be provided as a hole transport / injection layer.
- the electron transport layer and the electron injection layer may be provided as an electron transport / injection layer.
- the red light emitting unit 55r, the green light emitting unit 55g, and the blue light emitting unit 55b are not limited in the stacking order from the transparent substrate 51 side, and may be arranged in a stacking order suitable for each characteristic. Further, the light emitting units of each color constituting the multilayer element EL1 are not limited to the red light emitting unit 55r, the green light emitting unit 55g, and the blue light emitting unit 55. May be stacked, or a light emitting unit that emits complementary colors of RGB may be stacked.
- red (R) emitted light hr, green (G ) Emission light hg and blue (B) emission light hb can be freely emitted.
- FIG. 4 is a schematic cross-sectional configuration diagram of the single-layer element EL2.
- the single-layer element EL2 includes, for example, a first electrode 57-1 and a second electrode 57-2 that are sequentially stacked from the transparent substrate 51 side.
- a white light emitting unit 57w is sandwiched between these electrodes.
- the white light emitting unit 57w is configured to obtain white (W) emitted light hw by recombination of holes injected from the anode and electrons injected from the cathode.
- the first electrode 57-1 through which the emitted light obtained in the white light emitting unit 57w is transmitted is formed using a light-transmitting conductive material.
- a light-transmitting conductive material the same material as the first electrode 55-1 of the multilayer element EL1 is used in the same manner.
- the second electrode 57-2 is configured using a conductive material having light reflectivity.
- the conductive material having such light reflectivity the same material as the fourth electrode 55-4 of the multilayer element EL1 is used in the same manner.
- the white light emitting unit 57w may be configured to obtain white (W) emitted light hw.
- the color temperature of the emitted light hw takes a value in the range of 2000K to 12000K.
- Such a white light-emitting unit 57w may have a configuration in which light-emitting units that can obtain mutually complementary colors of light emission are stacked via an intermediate layer.
- the configuration of each light emitting unit is the same as that of the multilayer element EL1 without limiting the overall layer structure of the light emitting unit of the organic electroluminescent element.
- the single-layer element EL2 as described above can freely emit white (W) emitted light hw by controlling the voltage supplied to the first electrode 57-1 and the second electrode 57-2 by the light emission drive circuit 53. Can emit light.
- any electrode of the stacked EL 1 and any electrode of the stacked EL 2 may be provided as a common electrode.
- the first electrode 55-1 of the multilayer element EL1 and the first electrode 57-1 of the single layer element EL2 are provided as a common electrode, or the fourth electrode 55-4 of the multilayer element EL1
- the second electrode 57-2 of the single-layer element EL2 may be provided as a common electrode.
- each layer constituting the multilayer element EL1 and the single-layer element EL2 having the above configuration is not limited, and an appropriate method such as a vapor deposition method or a coating method is adopted.
- each light emitting unit of the multilayer element EL1 and the single layer element EL2 has a light emitting layer formed using at least an organic material. For this reason, it is assumed that sealing is performed by a sealing member not shown here, but the sealing structure is not limited, and it may be a hollow structure or a sealing agent filling structure. Good.
- FIG. 5 is a timing chart for explaining a driving method of the display device 1 and shows a period of one frame.
- a driving method of the display device 1 will be described with reference to FIGS. 1 to 4 together with FIG.
- the high period indicates that the gate of the thin film transistor Tr is on
- the high period indicates the light emitting period of each light emitting unit. ing.
- the scanning line driving circuit 13a in the shutter element panel 3 sequentially supplies row selection signals to the scanning lines 13 every first period t1 to fourth period t4 obtained by dividing one frame.
- the shutter elements 3a are sequentially selected for each row.
- the number of divisions of one frame corresponds to the number of light emission colors of the light emitting units provided in the backlight panel 5 (here, four colors of W, R, G, and B).
- Each of the first period t1 to the fourth period t4 is a period assigned to the light emission color of the light emitting unit provided in the backlight panel 5.
- the signal line driving circuit 15a sequentially supplies video signals corresponding to the luminance information to the signal lines 15 in accordance with the timing of supplying the row selection signals to the scanning lines 13.
- a voltage corresponding to the amount of signal supplied from each signal line 15 is applied to the pixel electrode 19 of each shutter element 3a connected to the selected scanning line 13, and each shutter according to the voltage.
- the shutter of the element 3a is opened.
- the liquid crystal molecules of the liquid crystal layer LC corresponding to each pixel electrode 19 have an inclination corresponding to the voltage applied to the pixel electrode 19, so that the opening corresponding to the amount of signal supplied from each signal line 15.
- the shutter element 3a opens at a rate.
- all the shutter elements 3a correspond to the signal amount supplied from each signal line 15. It becomes an open state.
- the backlight panel 5 is driven as follows within one frame period. That is, in the first period t1 to the fourth period t4 in which one frame is divided, the light emission drive circuit 53 is arranged in the order of the light emission colors assigned to the first period t1 to the fourth period t4 and the single layer element EL1. The light emitting units of the mold element EL2 are caused to emit light sequentially.
- each light emitting unit may be so-called local dimming, in which the luminance at the time of each light emission is controlled in accordance with the video signal corresponding to the luminance information supplied to the signal line driving circuit 15a of the shutter element panel 3.
- the respective emitted lights hw, hr, hg, hb generated in the first period t1 to the fourth period t4 are transmitted through the shutter element 3a according to the aperture ratio of the shutter element 3a in the first period t1 to the fourth period t4. To do.
- the white (W) emitted light hw, the red (R) emitted light hr, the green (G) emitted light hg, and the blue (B) emitted light hb are displayed in a time-division manner during one frame period.
- the feed sequential driving is performed.
- the light emission drive circuit 53 sets a blank period tb from the first line t1 to the fourth period t4 to the end of the selection of the first line scan line to the last line scan line. Stops the light emission in the light emitting unit. Thereby, the black period (Bk) is displayed in the blank period tb in all the shutter elements, and the transmission amount of each color is prevented from being different for each row of the shutter elements. In this driving, a portion corresponding to one shutter element 3a is one pixel.
- the display device 1 having the above-described configuration has a configuration in which the backlight panel 5 provided with the organic electroluminescent elements is provided on the shutter element panel 3, so that the frame can be reduced in size and thickness. It is.
- the display device 1 includes a single layer element EL2 including a white light emitting unit 57w as an organic electroluminescent element. Is provided. As a result, the luminance of the entire display screen is improved, as compared with the case where only the emission of red (R) emission light hr, green (G) emission light hg, and blue (B) emission light hb is used. Thus, power consumption can be reduced.
- the single-layer element EL2 including the white light emitting unit 57w, light emission of each color light from the red light emitting unit 55r, the green light emitting unit 55g, and the blue light emitting unit 55b is hindered. In this way, even lower power consumption can be achieved.
- FIG. 6 is a schematic plan view of a main part for explaining a modification of the first embodiment.
- the display device 1A shown in this figure is different from the display device 1 of the first embodiment in the configuration of the backlight panel 5A. That is, in the backlight panel 5A, the multilayer element EL1 is disposed as a common element and the single-layer element EL2 is disposed as a common element between the columns of the shutter elements 3a disposed adjacent to each other in the row direction. Is where you are. Other configurations are the same as those of the first embodiment including the driving method.
- Second Embodiment 7 and 8 are diagrams illustrating the configuration of a display device 1 'according to the second embodiment to which the present invention is applied.
- the display device 1 ′ shown in these drawings differs from the display device of the first embodiment described with reference to FIGS. 1 to 5 in that the planar configuration of the shutter element panel 3 ′ and the scanning lines by the scanning line driving circuit 13a. And the light emission control by the light emission drive circuit 53 ′.
- the shutter element 3a, the stacked element EL1, the single layer element EL2, and other configurations are the same as those in the first embodiment. For this reason, the same code
- FIG. 7 is a schematic plan view of a main part for explaining the planar configuration of the display device 1 ′ of the second embodiment.
- a first scanning line 13-1 and a second scanning line 13-2 are set as one set, and a plurality of sets of first scanning lines 13 are set.
- -1 and the second scanning line 13-2 are wired in the row direction (here, the horizontal direction).
- One set of the first scanning line 13-1 and the second scanning line 13-2 are wired close to each other.
- the first signal line 15-1 and the second signal line 15-1 are set as one set, and a plurality of sets of the first signal line 15-1 and the second signal line 15-2 are set.
- a pair of the first signal line 15-1 and the second signal line 15-2 are wired so as to be spaced apart from each other so that the shutter element 3a is disposed between them.
- the first signal line 15- 1 and the second signal line 15-2 are alternately wired.
- one shutter element 3a is provided at each intersection of the first scanning line 13-1, the second scanning line 13-2, and the first signal line 15-1.
- one shutter element 3a is provided at each intersection of the first scanning line 13-1, the second scanning line 13-2, and the second signal line 15-2.
- a common wiring 17 is wired on the first substrate 11a in parallel with the first scanning line 13-1 and the second scanning line 13-2.
- a first scanning line driving circuit 13a-1 for driving the first scanning line 13-1 and a second scanning line for driving the second scanning line 13-2.
- a two-signal line drive circuit 15a-2 is arranged.
- each shutter element 3a is the same as that of the first embodiment including the open / close circuit. However, the shutter element 3a is arranged in such a manner that one row of shutter elements 3a is overlaid on one multilayer element EL1 in the backlight panel 5 ′, and one row of shutter elements 3a is overlaid on one single layer type element EL2. Has been.
- the shutter element 3a disposed so as to overlap the stacked element EL1 is connected to the first scanning line 13-1 and the first signal line 15-1.
- the shutter element 3a disposed so as to overlap the single-layer element EL2 is connected to the second scanning line 13-2 and the second signal line 15-2.
- the shutter elements 3a arranged in the row direction parallel to the first scanning line 13-1 and the second scanning line 13-2 are:
- the first scanning line 13-1 and the second scanning line 13-2 are alternately connected, and the first signal line 15-1 and the second signal line 15-2 are alternately connected.
- FIG. 8 is a schematic cross-sectional view of a main part for explaining the layer structure of the display device 1 ′ of the second embodiment, and is a view corresponding to the cross section AA ′ of FIG.
- the layer configuration of the shutter element panel 3 ′ of the second embodiment is the same as the layer configuration of the shutter element panel of the first embodiment.
- one shutter element 3a is disposed so as to overlap only one stacked element EL1 or one single layer element EL2 in the backlight panel 5 ′.
- planar configuration and layer configuration of backlight panel 5 ′ are the same as those in the first embodiment.
- the configurations of the multilayer element EL1 and the single-layer element EL2 are the same as those described with reference to FIGS. 3 and 4 in the first embodiment.
- the multilayer element EL1 and the single-layer element EL2 are alternately arranged for each column of the shutter elements 3a.
- the driving procedure of the multilayer element EL1 and the single-layer element EL2 by the light emission driving circuit 53 ′ is different from the first embodiment as will be described later.
- FIG. 9 is a timing chart for explaining a driving method of the display device 1 ′, and shows a period of one frame.
- a driving method of the display device 1 ′ will be described with reference to FIGS. 3 to 4 and FIGS. 7 to 8 together with FIG.
- the timing chart for the driving of the first scanning line 13-1 and the driving of the second scanning line 13-2 is that the gate of the thin film transistor Tr is on during the high period, and the timing chart of the light emitting unit is The high period represents the light emission period of each light emitting unit.
- the first scanning line driving circuit 13a-1 in the shutter element panel 3 ′ sequentially selects rows for the first scanning line 13-1 every first to third periods t1 to t3 obtained by dividing one frame. Supply signal.
- the shutter elements 3a overlaid on the multilayer element EL1 are sequentially selected for each row.
- the number of divisions of one frame corresponds to the number of emission colors of the light emitting units provided in the multilayer element EL1 of the backlight panel 5 ′ (here, three colors of R, G, and B).
- Each of the first period t1 to the third period t3 is a period assigned to the light emission color of the light emitting unit provided in the multilayer element EL1.
- the second scanning line driving circuit 13a-2 sequentially supplies row selection signals to the second scanning line 13-2 for each frame. As a result, in one frame, the shutter elements 3a overlaid on the single-layer element EL2 are sequentially selected for each row.
- the first signal line driving circuit 15a-1 supplies a video signal corresponding to the luminance information to each first signal line 15-1 in accordance with the timing of supplying the row selection signal to the first scanning line 13-1. Are sequentially supplied. At this time, a video signal is supplied from the first signal line 15-1 every first period t1 to third period t3 obtained by dividing one frame.
- the second signal line driving circuit 15a-2 outputs a video signal corresponding to the luminance information to each second signal line 15-2 in accordance with the timing of supplying the row selection signal to the second scanning line 13-2. Supply sequentially. At this time, a video signal is supplied from the signal line 15 for each frame.
- the first signal line 15-1 or the second signal line 15 is applied to the pixel electrode 19 of each shutter element 3a connected to the selected first scanning line 13-1 and second scanning line 13-2.
- a voltage corresponding to the amount of signal supplied from -2 is applied, and the shutter of each shutter element 3a opens according to the voltage.
- the liquid crystal molecules of the liquid crystal layer LC corresponding to each pixel electrode 19 have an inclination corresponding to the voltage applied to the pixel electrode 19, so that an opening is formed according to the amount of signal supplied from each signal line 15. It will be in the state.
- the shutter element 3a to which the first scanning line 13-1 is connected and connected to the multilayer element EL1 is in an open state in accordance with the signal amount every first period t1 to third period t3 obtained by dividing one frame. Changes.
- the opening state of the shutter element 3a connected to the single-layer element EL2 to which the second scanning line 13-2 is connected changes according to the signal amount for each frame.
- the backlight panel 5 ' is driven as follows within a period of one frame.
- the light emission drive circuit 53 ′ includes the light emitting units of the stacked element EL1 in the order of the light emission colors assigned to the first period t1 to the third period t3 in the first period t1 to the third period t3 of one frame. In sequence.
- each light emitting unit emits light according to a video signal corresponding to luminance information supplied to the first signal line drive circuit 15a-1 and the second signal line drive circuit 15a-2 of the shutter element panel 3 ′. It is good also as what corresponds to what is called local dimming which controls the brightness
- the respective emitted light hr, hg, hb generated from the multilayer element EL1 corresponds to the shutter according to the aperture ratio of the shutter element 3a in the first period t1 to the third period t3. It passes through the element 3a.
- the light emission drive circuit 53 causes each light emitting unit of the multilayer element EL1 to sequentially emit light and emits the white light emitting unit 57w of the single layer element EL2 during one frame period.
- the emitted light hw generated from the single-layer element EL2 passes through the shutter element 3a according to the aperture ratio of the shutter element 3a in the period of one frame.
- feed sequential driving is performed in which the red (R) emission light hr, the green (G) emission light hg, and the blue (B) emission light hb are displayed in a time-division manner during one frame period. .
- white (W) emitted light hw is displayed in a period of one frame.
- the light emission drive circuit 53 ′ continues from the first scanning line 13-1 in the first row until the first scanning line 13-1 in the last row has been selected in the first period t 1 to the third period t 3.
- the interval is a blank period tb.
- a period from the second scanning line 13-2 in the first row to the end of selection of the second scanning line 13-2 in the last row is set as a blank period tb.
- the blank period tb light emission in the light emitting unit is stopped.
- the blank period tb is displayed in black (Bk), and the transmission amount of each color is prevented from being different for each row of the shutter elements 3a.
- the portions corresponding to the two shutter elements 3a overlapping the multilayer element EL1 and the single layer element EL2 constitute subpixels, respectively, and these two shutter elements 3a constitute one pixel.
- the display device 1 ′ having the above-described configuration has a configuration in which a backlight panel 5 ′ provided with an organic electroluminescent element is provided on the shutter element panel 3 ′, and thus is similar to the display device of the first embodiment. It is possible to achieve a smaller and thinner frame.
- a white light emitting unit 57w is provided as an organic electroluminescent element in addition to the stacked element EL1 including the red light emitting unit 55r, the green light emitting unit 55g, and the blue light emitting unit 55b. Further, since the single-layer element EL2 is provided, low power consumption can be achieved as in the display device of the first embodiment.
- FIG. 10 is a schematic plan view of a main part for explaining a modification of the second embodiment.
- the display device 1A ′ shown in this figure is different from the display device 1 ′ of the second embodiment in the configuration of the backlight panel 5A ′. That is, in the backlight panel 5A ′, the stacked element EL1 is disposed as a common element and the single-layer element EL2 is disposed as a common element between the columns of the shutter elements 3a disposed adjacent to each other in the row direction. There is. In this case, the pair of the first signal line 15-1 and the second signal line 15-2 are wired with the arrangement being alternately changed, and the first column is the second signal line 15-2, the first signal.
- next column is arranged in the order of the first signal line 15-1 and the second signal line 15-2, and in the next column, the order is changed and wired.
- Other configurations are the same as those of the second embodiment including the connection state with the shutter element 3a and the driving method.
- the configuration using an organic electroluminescent element including the white light emitting unit 57w as the single-layer element EL2 is exemplified.
- the single-layer element EL2 is not limited to such a configuration, and includes, for example, a light-emitting unit that can obtain complementary light emission with respect to the single-color light emission obtained in the multilayer element EL1. Also good. Even with such a configuration, since the luminance of the entire display screen is improved, the same effect can be obtained.
- Red light emitting unit 55g ... Green light emitting unit, 55b ... Blue light emitting unit, 57-1 ... First electrode (single layer type element), 57-2 ... Second electrode (single layer type element), 57w ... White Light emitting unit, EL1 ... stacked element (organic electroluminescent element), EL2 ... single layer element (organic electroluminescent element)
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Abstract
Description
図1~図4は、本発明を適用した第1実施形態の表示装置1の構成を説明する図面である。これらの図に示す表示装置1は、いわゆるフィールドシーケンシャル方式のものであり、透過型のシャッタ素子パネル3と、有機電界発光素子を用いたバックライトパネル5とを積層させた構成である。以下、表示装置1の構成を、シャッタ素子パネル3の平面構成、シャッタ素子パネル3の層構成、バックライトパネル5の平面構成、バックライトパネル5の層構成、表示装置1の駆動方法の順に説明する。
図1は、第1実施形態の表示装置1の平面構成を説明する要部の概略平面図である。この図に示す表示装置1におけるシャッタ素子パネル3は、例えば液晶表示パネルであり、2枚の基板間に液晶層が挟持されたものである。尚、図1においては、シャッタ素子パネル3として、一方の基板(第1基板11a)の平面図を示している。
図2は、第1実施形態の表示装置1の層構成を説明する要部概略断面図であり、図1のA-A’断面に相当する図である。この図に示すように、シャッタ素子パネル3は、ガラス基板やプラスチック基板のような透明材料からなる第1基板11aと第2基板11bとの間に液晶層LCを挟持している。このうち第1基板11a上には、図1を用いて説明した回路が形成されている。
図1に示すように、バックライトパネル5は、有機電界発光素子を備えたものであり、シャッタ素子パネル3における第1基板11a側に配置されている。このバックライトパネル5は、透明基板51の一主面上に、積層型素子EL1と単層型素子EL2とを備えたものである。ここでは一例として、透明基板51におけるシャッタ素子パネル3とは逆側の面上に積層型素子EL1と単層型素子EL2とが配置された構成となっている。
図1および図2に示すように、バックライトパネル5は、ガラス基板やプラスチック基板のような透明基板51におけるシャッタ素子パネル3とは逆側の面上に積層型素子EL1と単層型素子EL2とが配置された構成である。積層型素子EL1および単層型素子EL2で得られた発光光は、透明基板51を介してシャッタ素子パネル3側に取り出される。積層型素子EL1および単層型素子EL2の構成は、次のようである。
図3は、積層型素子EL1の概略断面構成図である。この図に示すように、積層型素子EL1は、透明基板51側から順に、例えば第1電極55-1、第2電極55-2、第3電極55-3、および第4電極55-4を有している。これらの電極の間には、異なる発光色の発光ユニットが挟持されている。
図4は、単層型素子EL2の概略断面構成図である。この図に示すように、単層型素子EL2は、例えば透明基板51側から順に積層された第1電極57-1および第2電極57-2を有している。これらの電極の間には、白色発光ユニット57wが挟持されている。
図5は、表示装置1の駆動方法を説明するためのタイミングチャート図であり、1フレームの期間を示している。以下に、図5とともに先の図1~図4を参照しつつ、表示装置1の駆動方法を説明する。尚、図5において、走査線13の駆動についてのタイミングチャートは、ハイ期間が薄膜トランジスタTrのゲートのオン状態とし、発光ユニットの駆動についてのタイミングチャートは、ハイ期間が各発光ユニットの発光期間を表している。
以上のような構成の表示装置1は、シャッタ素子パネル3に重ねて有機電界発光素子を設けたバックライトパネル5を設けた構成であるため、額縁の小型化と薄型化を達成することが可能である。
図6は、第1実施形態の変形例を説明する要部の概略平面図である。この図に示す表示装置1Aが、第1実施形態の表示装置1と異なるところは、バックライトパネル5Aの構成にある。すなわちバックライトパネル5Aは、行方向に隣接して配置されたシャッタ素子3aの列間において、積層型素子EL1が共通素子として配置されると共に、単層型素子EL2が共通素子して配置されているところにある。他の構成は、駆動方法も含めて第1実施形態と同様である。
図7および図8は、本発明を適用した第2実施形態の表示装置1’の構成を説明する図面である。これらの図に示す表示装置1’が、図1~図5を用いて説明した第1実施形態の表示装置と異なるところは、シャッタ素子パネル3’の平面構成、走査線駆動回路13aによる走査線の選択手順、および発光駆動回路53’による発光制御にある。シャッタ素子3a、積層型素子EL1、単層型素子EL2、およびその他の構成は、第1実施形態と同様である。このため以下において第1実施形態と同様の構成要素には同一の符号を付し、重複する説明は省略する。
図7は、第2実施形態の表示装置1’の平面構成を説明する要部の概略平面図である。この図に示すように、シャッタ素子パネル3’の第1基板11a上には、第1走査線13-1と第2走査線13-2とを1組とし、複数組の第1走査線13-1と第2走査線13-2とが行方向(ここでは水平方向)に配線されている。1組の第1走査線13-1と第2走査線13-2とは、近接して配線される。
図8は、第2実施形態の表示装置1’の層構成を説明する要部の概略断面図であり、図7のA-A’断面に相当する図である。この図に示すように、第2実施形態のシャッタ素子パネル3’の層構成は、第1実施形態のシャッタ素子パネルの層構成と同様である。ただし、1つのシャッタ素子3aは、バックライトパネル5’における1つの積層型素子EL1または1つの単層型素子EL2のみに重ねて配置されている。
図7および図8に示すように、バックライトパネル5’の平面構成および層構成は、第1実施形態と同様である。また、積層型素子EL1および単層型素子EL2の構成は、第1実施形態において図3および図4を用いて説明した構成と同様である。ただし、積層型素子EL1と単層型素子EL2とは、シャッタ素子3aの列毎に交互に配置されている。ただし、発光駆動回路53’による積層型素子EL1と単層型素子EL2の駆動手順は、以降に説明するように、第1実施形態とは異なる手順となっている。
図9は、表示装置1’の駆動方法を説明するためのタイミングチャート図であり、1フレームの期間を示している。以下に、図9とともに先の図3~図4および図7~図8を参照しつつ、表示装置1’の駆動方法を説明する。尚、図9において、第1走査線13-1の駆動および第2走査線13-2の駆動についてのタイミングチャートは、ハイ期間が薄膜トランジスタTrのゲートのオン状態とし、発光ユニットのタイミングチャートは、ハイ期間が各発光ユニットの発光期間を表している。
以上のような構成の表示装置1’は、シャッタ素子パネル3’に重ねて有機電界発光素子を設けたバックライトパネル5’を設けた構成であるため、第1実施形態の表示装置と同様に、額縁の小型化と薄型化を達成することが可能である。
図10は、第2実施形態の変形例を説明する要部の概略平面図である。この図に示す表示装置1A’が、第2実施形態の表示装置1’と異なるところは、バックライトパネル5A’の構成にある。すなわちバックライトパネル5A’は、行方向に隣接して配置されたシャッタ素子3aの列間において、積層型素子EL1が共通素子として配置されると共に、単層型素子EL2が共通素子して配置されているところにある。またこの場合、1組の
第1信号線15-1と第2信号線15-2とは、交互に配置を入れ替えて配線されて、1列目が第2信号線15-2、第1信号線15-1の順であれば、次の列は第1信号線15-1、第2信号線15-2の順で配置され、さらに次の列では順番を入れ替えて配線されることになる。他の構成は、シャッタ素子3aとの接続状態および駆動方法も含めて第2実施形態と同様である。
Claims (7)
- 光の透過を制御するシャッタ素子が行列状に配置された光透過型のシャッタ素子パネルと、
有機電界発光素子を有し前記シャッタ素子パネルに重ねて配置されたバックライトパネルとを備え、
前記有機電界発光素子として、複数の電極間に各色の発光ユニットをそれぞれ挟持させた積層型素子と、一対の電極間に白色または前記各色のうちの何れかに対する補色となる発光ユニットを挟持した単層型素子とが用いられ、
前記積層型素子と前記単層型素子とは、前記シャッタ素子に重なる状態で当該シャッタ素子の配列方向に沿ったストライプ状に配置された
表示装置。 - 前記シャッタ素子の列毎に、一対の前記積層型素子と前記単層型素子とが配置された
請求項1記載の表示装置。 - 行方向に隣接して配置された前記シャッタ素子の列間において、前記積層型素子が共通素子として配置されると共に前記単層型素子が共通素子して配置された
請求項2記載の表示装置。 - 前記シャッタ素子パネルは、複数の走査線および当該走査線と異なる方向に延設された複数の信号線を有し、
前記走査線と前記信号線との各交差部に、これらの走査線および信号線に接続された状態で前記各シャッタ素子が配置され、
前記バックライトパネルは、前記積層型素子の各電極および単層型素子の各電極に接続された発光駆動回路を有し、
前記発光駆動回路は、前記走査線の駆動による前記シャッタ素子の選択に合わせて、前記積層型素子を構成する前記各色の発光ユニットおよび前記単層型素子を構成する発光ユニットを順次発光させる
請求項2または3に記載の表示装置。 - 前記シャッタ素子の2列を1組とし、当該2列のシャッタ素子列毎に、前記積層型素子と単層型素子とが配置された
請求項1記載の表示装置。 - 行方向に隣接して配置された前記シャッタ素子の列間において、前記積層型素子が共通素子として配置されると共に前記単層型素子が共通素子して配置された
請求項5記載の表示装置。 - 前記シャッタ素子パネルは、複数組の第1走査線および第2走査線と、当該第1走査線および第2走査線と異なる方向に延設された複数組の第1信号線および第2信号線とを有し、
前記各組の第1走査線および前記第2走査線と前記各第1信号線との交差部に、前記積層型素子に重ねて配置された前記シャッタ素子が、当該第1走査線および当該第1信号線に接続された状態で配置され、
前記各組の第1走査線および前記第2走査線と前記各第2信号線との交差部に、前記単層型素子に重ねて配置された前記シャッタ素子が、当該第2走査線および当該第2信号線に接続された状態で配置され、
前記バックライトパネルは、前記積層型素子の各電極および単層型素子の各電極に接続された発光駆動回路を有し、
前記発光駆動回路は、前記第1走査線の駆動による前記シャッタ素子の選択に合わせて、前記積層型素子を構成する前記各色の発光ユニットを順次発光させ、前記第2走査線の駆動による前記シャッタ素子の選択に合わせて、前記単層型素子を構成する発光ユニットを発光させる
請求項5または6記載の表示装置。
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JP2006024648A (ja) * | 2004-07-06 | 2006-01-26 | Toyota Industries Corp | 照明装置 |
WO2006013667A1 (ja) * | 2004-08-05 | 2006-02-09 | Kabushiki Kaisha Toyota Jidoshokki | 液晶表示装置 |
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