WO2004074739A1 - 発光素子及びディスプレイ - Google Patents
発光素子及びディスプレイ Download PDFInfo
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- WO2004074739A1 WO2004074739A1 PCT/JP2004/001844 JP2004001844W WO2004074739A1 WO 2004074739 A1 WO2004074739 A1 WO 2004074739A1 JP 2004001844 W JP2004001844 W JP 2004001844W WO 2004074739 A1 WO2004074739 A1 WO 2004074739A1
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- light
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- emitting device
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/01—Recovery of luminescent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Definitions
- the present invention relates to a light emitting device and a display. Background art
- Liquid crystal display panels and plasma display panels have been known as panels for direct-view displays.
- the liquid crystal display panel controls the amount of light transmission for each pixel by controlling the voltage applied to the pixel electrode, and makes the R (red) pixel, G (green) pixel, and B (blue) pixel light amount different. Reproduce the desired color.
- the plasma display panel controls the amount of light emission by controlling the number of times of voltage application to the electrodes (the number of sustain discharges between the X and Y electrodes), and the amount of light emitted by the R, G, and B pixels. The desired color is reproduced by making it different.
- the R light wavelength of the R pixel, the G light wavelength of the G pixel, and the B light wavelength of the B pixel are single wavelengths, respectively, as shown in Fig. 6.
- the color reproduction range on the chromaticity diagram is triangular, and colors cannot be reproduced beyond this range. Disclosure of the invention
- the present invention has been made in view of the above circumstances, and has as its object to provide a light emitting element capable of changing a light emitting color and a display capable of expanding a color reproduction range. I do.
- a light-emitting element according to the present invention (hereinafter referred to as a first configuration in this section) includes: a light-emitting portion in which a plurality of photoluminescent bodies having different emission colors are separately arranged; and a light-emitting section that emits light for exciting the photoluminescent body. And a switching unit for selectively guiding light from the emission unit to the photoluminescent body of the light emission unit.
- one light emitting element can emit completely different colors (for example, red and green).
- the light emitting section may be configured as follows. That is, the light emitting unit may include a light emitting diode, and a unit that controls the amount of light emitted from the light emitting diode. Further, the emission section may include an electroluminescent body, and means for controlling the amount of emitted light from the electroluminescent body. In addition, the emission unit may include: a unit configured to irradiate the phosphor with an electron beam to emit light; and a unit configured to control the electron beam to control the amount of emitted light from the phosphor. Good (for example, a CRT and a cold cathode panel are examples of such an emission unit).
- Good for example, a CRT and a cold cathode panel are examples of such an emission unit).
- the emission unit may include a unit that emits light obtained by discharge, and a unit that controls the discharge to control the amount of emitted light.
- a plasma panel with or without a phosphor can be used.
- the emission unit may include a backlight, and a liquid crystal panel that controls a transmitted light amount of light emitted from the backlight.
- the switching unit may generate a state in which the light from the emission unit goes straight and a state in which the light does not go straight. May be configured.
- the switching unit includes a liquid crystal cell that controls rotation of a polarization direction of light having a predetermined polarization from the emission unit, a birefringent plate, and a control unit that controls energization of the liquid crystal cell.
- One or more devices may be provided.
- the switching unit includes: an acousto-optic effect element that selectively guides the light from the emission unit to a plurality of regions by an acousto-optic effect; and a control unit that controls energization to the acousto-optic effect element.
- the light emitting section has a photoluminescent body that emits light at a lower efficiency at a position where the light that travels straight ahead enters. Further, it is preferable that the light emitting section has a photoluminescent body that emits color light with lower visibility at a position where the light that goes straight ahead is incident. Further, in the first configuration and the configuration dependent on the first configuration, a filter that cuts a part of the light emitted from the photoluminescent body or the whole or a part of the excitation light is provided on the light emitting side of the light emitting unit. It may be provided. Examples of the filter include a UV cut filter that cuts ultraviolet light that is excitation light, a cutoff filter that limits a color range (improves color reproducibility), and a bandpass filter.
- the light-emitting device of the present invention (hereinafter referred to as a second configuration) includes a light-emitting portion in which a plurality of photoluminescent bodies having different emission colors are separately arranged, and an electron beam for exciting the above-described photoluminescent body.
- one light emitting element can emit completely different colors (for example, red and green).
- the emission unit may include an electron gun or a cold cathode unit (for example, a carbon nanotube).
- the radiator include a CRT and a field emission panel that do not have a phosphor.
- the switching unit may be configured to generate a state in which the electron beam from the emission unit goes straight and a state in which the electron beam does not go straight.
- the switching means may comprise: a magnetic field generating means for changing the course of the electron beam; and a control means for controlling energization of the magnetic field generating means.
- a filter that cuts a part of the light emitted from the photoluminescent body may be provided on the light emitting side of the light emitting unit.
- the light-emitting device of the present invention (hereinafter, referred to as a third configuration) includes a first region having a photoluminescent body, a second region having no photoluminescent body, and an excitation of the photoluminescent body. And a switching unit that selectively guides the visible light from the emission unit to the first region and the second region.
- one light emitting element can emit completely different colors (for example, red and green).
- the emission section may be configured as follows. That is, the light emitting unit may include a light emitting diode that emits visible light, and a unit that controls the amount of light emitted from the light emitting diode.
- the emission unit may include an electroluminescent body that emits visible light, and a unit that controls the amount of emitted light from the electroluminescent body.
- the emission unit is configured to include: a unit configured to irradiate a phosphor with an electron beam to emit visible light; and a unit configured to control the amount of emitted light of the phosphor by controlling the electron beam. (For example, a CRT or a field emission Panel).
- the emission unit includes a unit configured to irradiate the phosphor with light obtained by the discharge to emit visible light, and a unit configured to control the discharge to control the amount of emitted visible light.
- a unit configured to irradiate the phosphor with light obtained by the discharge to emit visible light
- a unit configured to control the discharge to control the amount of emitted visible light.
- the emission unit may include a backlight that emits visible light, and a liquid crystal panel that controls a transmitted light amount of light emitted from the backlight.
- the switching unit may be configured to generate a state in which the light from the emission unit travels straight and a state in which the light does not travel straight.
- the switching means comprises: a liquid crystal cell that controls rotation of a polarization direction of light having a predetermined polarization from the emission unit; a birefringent plate; and control means that controls energization of the liquid crystal cell. More than one may be provided. Further, the switching means includes: an acousto-optic effect element for selectively guiding light from the emission unit to a plurality of regions by an acousto-optic effect; and a control means for controlling energization to the acousto-optic effect element. May be provided with one or more components.
- a part of the light emitted from the photoluminescent body, a part of the visible light from the emission part, or an undesired ultraviolet ray is provided on the light emission side of the region.
- the filter may be configured to include a filter that cuts the noise. Further, as the filter, a cutoff filter or a bandpass filter that limits a color range (improves color reproducibility) can be used.
- the photoluminescence body may be a quantum dot having a different emission color depending on the size.
- a display of the present invention is characterized by including a plurality of any of the above light emitting elements as pixels.
- the display device is configured to emit red light, blue light, and blue light as appropriate to display a full-color image.
- the light emitting unit is configured to receive blue light as excitation light, switch between red light and green light, and emit the same.
- the light emitting portion is formed on a liquid crystal panel having a backlight that emits blue light with a gap provided. With this configuration, red light and green light are emitted from the light emitting unit, and blue light is emitted from the gap. If the light-emitting portion and the gap are regarded as pixels, a display capable of performing full-color display with two pixels is obtained.
- the above-described configuration capable of displaying a full-color image it is preferable that at least one of red light, recording light, and blue light is emitted with different wavelengths.
- the color reproduction range on the chromaticity diagram is made to be a quadrangle or more polygonal shape. Thus, colors can be reproduced beyond the conventional color reproduction range of triangles.
- FIG. 1 is a cross-sectional view showing a structure of a light-emitting element (a pixel in a direct-view display) according to an embodiment of the present invention.
- 2 (a) and 2 (b) are explanatory diagrams of the operation of the light emitting device (pixel in a direct-view display) of FIG.
- FIG. 3 is an explanatory diagram showing a color reproduction range of the direct-view display of FIG.
- FIG. 4 is an explanatory diagram showing an acousto-optic effect element.
- FIG. 5 is an explanatory diagram showing an example of a planar light source.
- FIG. 6 is an explanatory diagram showing a color reproduction range in a conventional display.
- FIG. 1 is a cross-sectional view showing a structure of a pixel (a structure of a light emitting element) in a direct-view display of this embodiment.
- the plane light source (emission unit) 1 emits ultraviolet light as excitation light, and is configured to be able to change the amount of light guided to each pixel.
- Such a planar light source 1 can be constituted by a backlight composed of a lamp that emits ultraviolet light and a light guide plate, and a light transmissive liquid crystal panel provided on the light emission side of the back light. In other words, by changing the voltage applied to the pixel electrode in the liquid crystal panel, the amount of light guided to the light-emitting portion in each pixel can be varied (see FIG. 5).
- a plasma display panel having no phosphor can be used as the flat light source 1.
- a plasma display panel controls the X electrode, the Y electrode, and the address electrode to select a discharge pixel (light emitting pixel) and control the number of discharges (light emission amount).
- X-sus (sustain) data is input to the X electrode
- Y-sus (sustain) data is input to the Y electrode
- address data is input to the address electrode.
- the address data is data for controlling light emission and no light emission for each pixel of the plasma display panel.
- the luminance of the pixel depends on the number of discharges based on the X-sus data and the Y-sus data. Is controlled.
- the amount of light emitted from each color pixel in such a planar light source 1 is controlled by a luminance signal in a video signal.
- a polarization controlling liquid crystal panel 2 On the flat light source 1, a polarization controlling liquid crystal panel 2 is provided. On the light incident surface of the polarization control liquid crystal panel 2, a polarizing plate 2a for aligning the polarization direction of ultraviolet light emitted from the flat light source 1 is provided. In the polarization controlling liquid crystal panel 2, a liquid crystal cell 2b is formed corresponding to each pixel light emitting area on the flat light source 1. The liquid crystal cell 2b is driven by a TFT (thin film transistor) 2c. The liquid crystal cell 2b can rotate the polarization direction of the emitted light in accordance with the applied voltage. The driver for driving the TFT2c changes the voltage applied to the liquid crystal cell to continuously rotate the polarization direction, and continuously changes the ratio between the first polarized light and the second polarized light.
- TFT thin film transistor
- a birefringent plate 3 is provided on the polarization controlling liquid crystal panel 2. As shown in FIGS. 2 (a) and 2 (b), the birefringent plate 3 causes the light of the first polarized light to travel straight as ordinary light, while the light of the second polarized light is guided diagonally rightward in the figure as extraordinary light. It has become.
- Quantum dots are made of fine semiconductors, have the property of receiving excitation light (ultraviolet light) from a light source and emitting light (visible light) with a longer wavelength than that, and emit light with the size (particle size). (Emission light wavelengths).
- the quantum dot film 4 has a first quantum dot film (particle size A) 4 a and a second quantum dot film 4 b (particle size B: A ⁇ B) on the pixel light emitting region of the planar light source 1. ).
- the first quantum dot film 4a is located in the region receiving the ultraviolet light that is transmitted straight through the birefringent plate 3 and the second quantum dot film 4a is located in the region that receives the ultraviolet light that is refracted and transmitted through the birefringent plate 3.
- the quantum dot film 4b is located. These quantum dot films are formed, for example, by coating treatment with an ink jet. Formed.
- An ultraviolet cut filter 5 is provided on the quantum dot film 4.
- the quantum dot film 4 a quantum dot film for R (red), a quantum dot film for G (green), and a quantum dot film for B (blue) are formed.
- the quantum dot films are arranged and formed in a stripe arrangement or a delta arrangement.
- the quantum dots of the first quantum dot film 4 a and the second quantum dot film 4 b are so arranged that two types of red light having different wavelengths are emitted even in red.
- the quantum dot size of the first quantum dot film 4a is adjusted so that the G quantum dot film 4 emits two types of green light having different wavelengths even in green.
- the size of the quantum dot of the second quantum dot film 4b is adjusted, and the first quantum dot film 4 for B emits two types of blue light having different wavelengths even in blue.
- the size of the quantum dot of the quantum dot film 4a and the size of the quantum dot of the second quantum dot film 4b are adjusted.
- each color pixel can produce red light that is a mixture of red light of different wavelengths for red, for example.
- red can exist as an arbitrary point on the line connecting ⁇ and ⁇ instead of a single point.
- other colors can also exist on the chromaticity diagram as arbitrary points on the line instead of points.
- the color reproduction range has a triangular shape connecting certain points of each color (Fig. At other timings, the color reproduction range becomes a triangle of another shape (see the dotted line in the figure) that connects certain points of each color, and the color reproduction range is much greater than in the past. It will expand.
- the polarization control liquid crystal panel 2 and the birefringent plate 3 control the light to be guided to the first quantum dot film 4a or the second quantum dot film 4b, as shown in FIG.
- the acousto-optic effect element 6 may be used.
- the acousto-optic effect element 6 has a vibrator 6a connected to a high-frequency power supply, and by turning on / off the high-frequency power supply, ON / OFF of the diffracted light can be controlled. That is, when the diffracted light is off, the ultraviolet light from the planar light source 1 is guided to the first quantum dot film 4a, and when the diffracted light is on, the ultraviolet light from the planar light source 1 is transmitted to the second quantum dot film 4a. With the configuration leading to 4b, the light emission amount of the first quantum dot film 4a and the light emission amount of the second quantum dot film 4b can be controlled.
- a light source including a light-emitting diode and a supply power control unit that controls the amount of light emitted from the light-emitting diode can be used as the light source (light-emitting unit).
- a light source including an electroluminescence (E L) body and a supply power control unit for controlling the amount of light emitted from the electroluminescence body can be used as the light source (emission unit).
- E L electroluminescence
- Either an organic or inorganic substance may be used as the electroluminescent substance.
- a CRT or a field emission panel can be used as the light source (emission unit).
- the phosphor of the CRT C field emission panel one that emits ultraviolet rays upon receiving an electron beam is used.
- the light is not limited to ultraviolet light, and may be any light that excites the photoluminescent body.
- the luminous efficiency of the first quantum dot film 4a and the second quantum dot film 4b may not be the same. Therefore, if the luminous efficiency of the first quantum dot film 4a is lower than that of the second quantum dot film 4b, the first quantum dot film 4a is located at the position where the straight traveling light (ordinary light) is incident. 4a, and the second quantum dot film 4b is preferably placed at a position where extraordinary light enters. Ordinary light has higher transmission efficiency than extraordinary light, and guides ordinary light to lower luminous efficiency. The degree of uniformity becomes easy.
- the visibility of light emitted from the first quantum dot film 4a is not the same as the visibility of light emitted from the second quantum dot film 4b.
- Green light has higher visibility than red light and blue light. Therefore, if the outgoing light of the first quantum dot film 4a has lower luminous efficiency than the outgoing light of the second quantum dot film 4b, the position where the straight traveling light (ordinary light) is incident is considered. It is better to dispose the first quantum dot film 4a and dispose the second quantum dot film 4b at the position where the extraordinary light enters. Thus, the difference in visibility can be compensated for by the difference in light amount.
- the ultraviolet cut filter 5 is provided on the quantum dot film 4 so as to cut out the ultraviolet rays (excitation light) that leaks.
- the present invention is not limited to this.
- a cut-off filter or a band-pass filter may be provided to limit the image quality (improve color reproduction).
- the color reproduction range is hexagonal (see FIG. 3), but the present invention is not limited to this.
- the first quantum dot film 4a emits red light (R) and the second quantum dot film 4b emits first green light (G1).
- the quantum dot film 4a emits blue light (B), and the second quantum dot film 4b emits second green light (G2).
- green light exists not as a single point but as an arbitrary point on a line connecting the two points, and the color reproduction range becomes a square.
- a configuration in which the color reproduction range is another polygon is also possible. From the viewpoint of the visibility described above, it is preferable that the ordinary light be guided to the quantum dot film that emits red light or blue light.
- a quantum dot film having a different particle size is shown as a plurality of photoluminescent bodies having different emission colors, but the present invention is not limited to this quantum dot film.
- a photoluminescence body that emits visible light when irradiated with ultraviolet light is shown, but a photoluminescence body that emits an electron beam is shown.
- a field emission display or a CRT cathode ray tube
- a minute coil is formed for each pixel, and the direction of the electron beam can be changed by energizing ONZOFF to the minute coil.
- two pixels having different emission colors are combined to form one pixel (light-emitting element).
- One pixel (light emitting element) may be combined with two regions.
- a light source that emits visible light is used as the light source (emission unit). If the light source light is blue light, and the photoluminescent body in the first region is excited by blue light and emits green light, blue light and green light can be generated. Furthermore, if the photoluminescent body in the first region is combined with a light emitting element that emits red light when excited by blue light, light of three primary colors can be emitted. Further, for example, by combining a light emitting element that emits red light slightly different from the above red light, the color reproduction range on the chromaticity diagram can be expanded.
- a light source including a light emitting diode that emits visible light and a supply power control unit that controls the amount of light emitted from the light emitting diode can be used as the light source (visible light emitting unit).
- a light source including: an electroluminescent body that emits visible light; and a supply power control unit that controls the amount of light emitted from the electroluminescent body can be used.
- a light source for example, a CRT or a field emission panel can be used.
- a phosphor that emits visible light (eg, blue light) upon receiving an electron beam is used as a phosphor for a CRT or a field emission panel.
- a plasma panel having a phosphor can be used as a light source.
- the phosphor visible light (blue light, etc.)
- a device that emits light is used.
- a liquid crystal panel having a backlight that emits visible light can be used as a light source.
- a UV cut filter may be provided on the light emitting side of the light emitting unit. Further, a cut-off filter or a band-pass filter may be provided to limit the color range of the emission color (improve color reproduction).
- the optical path switching means composed of the polarization controlling liquid crystal panel 2 and the birefringent plate 3 or the optical path switching means composed of the acousto-optic effect element 6 are arranged in multiple stages. By doing so, light can be selectively guided to three or more regions, and a plurality of photoluminescent bodies having different emission colors may be arranged in these regions.
- the light-emitting element of the present invention can emit, for example, two types of red light having different wavelengths even in red. Also, one light-emitting element can emit completely different colors (for example, red and green).
- the color pixels can be continuously changed to, for example, two kinds of red light having different wavelengths even in red, so that the color reproduction range can be expanded.
- other color lights for example, cyan light, yellow light, and magenta light
- the range can be expanded.
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/546,327 US20060214903A1 (en) | 2003-02-21 | 2004-02-18 | Light-emitting device and display |
JP2005502747A JPWO2004074739A1 (ja) | 2003-02-21 | 2004-02-18 | 発光素子及びディスプレイ |
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Application Number | Priority Date | Filing Date | Title |
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JP2003044682 | 2003-02-21 | ||
JP2003-044682 | 2003-02-21 |
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WO2004074739A1 true WO2004074739A1 (ja) | 2004-09-02 |
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JP (1) | JPWO2004074739A1 (ja) |
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JP2001166739A (ja) * | 1994-10-25 | 2001-06-22 | James L Fergason | 光ディスプレイシステム及び方法、複屈折を使用する能動及び受動ディザリング、カラーイメージ重ね合わせ、及び位相統合偏光スイッチを用いるディスプレイ強調 |
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US6891583B1 (en) * | 1997-07-03 | 2005-05-10 | Eidgenössische Technische Hochschule Zurich | Photoluminescent display devices having a photoluminescent layer with a high degree of polarization in its absorption, and methods for making the same |
US6972809B2 (en) * | 2001-12-20 | 2005-12-06 | Sharp Kabushiki Kaisha | Path shifting optical device having polarization correcting section and optical display system including same |
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- 2004-02-18 JP JP2005502747A patent/JPWO2004074739A1/ja not_active Withdrawn
- 2004-02-18 US US10/546,327 patent/US20060214903A1/en not_active Abandoned
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JP2006269217A (ja) * | 2005-03-23 | 2006-10-05 | Rohm Co Ltd | 電子装置、ならびにそれを利用した表示装置およびセンサ |
JP2009175664A (ja) * | 2008-01-22 | 2009-08-06 | Ind Technol Res Inst | カラーフィルタモジュールおよびそれを備えた装置 |
WO2011036994A1 (en) * | 2009-09-28 | 2011-03-31 | Sharp Kabushiki Kaisha | Full color gamut display device using multicolor pixel elements and method thereof |
JP2012169646A (ja) * | 2010-10-15 | 2012-09-06 | Mitsubishi Chemicals Corp | 白色発光装置及び照明器具 |
JP2012178574A (ja) * | 2010-10-15 | 2012-09-13 | Mitsubishi Chemicals Corp | 白色発光装置及び照明器具 |
JP2017506355A (ja) * | 2013-12-10 | 2017-03-02 | ドルビー ラボラトリーズ ライセンシング コーポレイション | レーザ・ダイオード駆動lcd量子ドット・ハイブリッド表示装置 |
KR20200060430A (ko) | 2017-09-22 | 2020-05-29 | 디아이씨 가부시끼가이샤 | 광변환 필름 및 그것을 이용한 화상 표시 소자 |
WO2022079818A1 (ja) * | 2020-10-14 | 2022-04-21 | シャープ株式会社 | 表示装置 |
Also Published As
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US20060214903A1 (en) | 2006-09-28 |
JPWO2004074739A1 (ja) | 2006-06-01 |
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