WO2023199807A1 - 表示装置 - Google Patents
表示装置 Download PDFInfo
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- WO2023199807A1 WO2023199807A1 PCT/JP2023/014028 JP2023014028W WO2023199807A1 WO 2023199807 A1 WO2023199807 A1 WO 2023199807A1 JP 2023014028 W JP2023014028 W JP 2023014028W WO 2023199807 A1 WO2023199807 A1 WO 2023199807A1
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- refractive index
- display device
- microlenses
- color filter
- microlens
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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
- H10K59/80—Constructional details
- H10K59/875—Arrangements for extracting light from the devices
- H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
-
- 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
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
Definitions
- the present invention relates to a display device.
- This application claims priority based on Japanese Patent Application No. 2022-065160 filed in Japan on April 11, 2022, the contents of which are incorporated herein.
- micro-displays that use micro-LEDs, organic EL elements, etc. as light sources, there is a need to improve the efficiency of using the emitted light in order to increase brightness and reduce power consumption. ing.
- Patent Document 1 describes that the light utilization efficiency is increased by arranging a hemispherical microlens on a light emitting element. Further, Patent Document 2 describes that viewing angle characteristics are improved by providing a light-transmitting layer on a microlens.
- micro LEDs and organic EL elements do not have very high directivity of emitted light, so they enter the micro lens at various angles. Since light incident on the interface between the transparent layer and the microlens at an angle equal to or greater than the critical angle is totally reflected, it cannot be extracted to the outside as an effective emitted light component, causing a decrease in brightness.
- the inventor conducted various studies on the relationship between the aspect of the microlens and the light-transmitting layer, and completed the present invention based on the obtained knowledge.
- An object of the present invention is to provide a display device that can suppress loss of emitted light from micro LEDs and organic EL elements and improve usage efficiency.
- a first aspect of the present invention includes an element substrate on which a plurality of light sources are arranged, a protective layer provided on the element substrate and covering the plurality of light sources, and a protective layer provided on the protective layer and compatible with the plurality of light sources.
- a color filter having a plurality of monochromatic filters arranged as a color filter; a lens array provided on the color filter and having a plurality of microlenses arranged corresponding to the plurality of monochromatic filters; and a flattening layer that is provided to cover the plurality of microlenses and has a refractive index lower than the refractive index of the plurality of microlenses.
- the refractive index n m of the plurality of microlenses, the refractive index n t of the flattening layer, and r/H which is the ratio of the radius of curvature r and the height H of the lens surface of the plurality of microlenses. satisfies Equation 1 below. 0.3 ⁇ (n m -nt )-0.1(r/H)2+0.2(r/H) ⁇ 0.6...(1)
- the present invention it is possible to provide a display device that can suppress loss of emitted light from micro LEDs and organic EL elements and improve usage efficiency.
- FIG. 1 is a schematic cross-sectional view showing a part of a display device according to an embodiment of the present invention.
- FIG. 3 is a diagram showing the positional relationship among an organic EL element, a color filter, and a microlens in a plan view of the display device. It is a figure which shows the result of the ray tracing simulation in one shape of a microlens. It is a figure which shows the result of the ray tracing simulation in one shape of a microlens. It is a figure which shows the result of the ray tracing simulation in one shape of a microlens. It is a schematic sectional view showing a part of a display device concerning a modification of one embodiment of the present invention.
- the display device 1 uses the organic EL element 11 as a light source and has a configuration in which a large number of pixels are arranged in a front view.
- FIG. 1 shows a schematic cross-sectional view of one pixel of the display device 1.
- the display device 1 includes an element substrate 10 on which an organic EL element (light source) 11 is arranged, a protective layer 20 formed on the element substrate 10, a color filter 30, a lens array 40, and a planarization layer 50.
- a transparent substrate 70 is bonded onto the flattening layer 50 by an adhesive layer 60, and the user can view images displayed on the display device 1 from the side of the transparent substrate 70.
- the organic EL element 11 has a known configuration including a pixel electrode, a common electrode, and a functional layer, is connected to wiring (not shown) provided on the element substrate 10, and is driven to emit light independently.
- the protective layer 20 has transparency, protects the organic EL element 11, and is flattened to facilitate installation of the color filter 30.
- the protective layer 20 may be composed of a plurality of layers and may have gas barrier properties.
- a partition wall may be formed in the protective layer 20 to partition subpixels. By forming the partition wall, stray light to adjacent sub-pixels can be suppressed.
- the color filter 30 is provided on each organic EL element 11.
- the color filter 30 includes a plurality of monochromatic filters 30R, 30G, and 30B that transmit light in a wavelength band of any of the three primary colors of light, red (R), green (G), and blue (B).
- the number of monochromatic filters and the color to be transmitted can be determined depending on the display characteristics of the display device, and may include yellow or the like.
- a plurality of monochromatic filters 30R, 30G, and 30B are arranged so as to overlap the plurality of organic EL elements 11 in plan view. This may be expressed as a plurality of monochromatic filters 30R, 30G, 30B arranged corresponding to a plurality of organic EL elements 11.
- the lens array 40 is formed on the color filter 30 and has a plurality of microlenses 41 arranged in alignment corresponding to the monochromatic filters 30R, 30G, and 30B of the color filter 30.
- the plurality of microlenses 41 arranged corresponding to the monochromatic filters 30R, 30G, and 30B of the color filter 30 refer to the plurality of microlenses 41 that are aligned and arranged corresponding to the monochromatic filters 30R, 30G, and 30B of the color filter 30 so as to overlap with the monochromatic filters 30R, 30G, and 30B in a plan view. This means that the microlenses 41 are arranged in an aligned manner.
- the microlens 41 according to this embodiment is a so-called plano-convex lens, and has a refractive index higher than at least the refractive index of air or the flattening layer 50.
- each of the plurality of microlenses 41 may be considered to have the same refractive index.
- FIG. 2 shows the positional relationship among the organic EL element 11, color filter 30, and microlens 41 in a plan view of the range shown in FIG.
- a pixel of the display device 1 is composed of three sub-pixels 101, 102, and 103 corresponding to red (R), green (G), and blue (B), respectively.
- a red monochromatic filter 30R, a green monochromatic filter 30G, and a blue monochromatic filter 30B, which constitute the color filter 30, are arranged in each sub-pixel 101, 102, and 103, respectively.
- One organic EL element 11 and three microlenses 41 are arranged for each sub-pixel 101, 102, 103.
- the above is an example, and the shape of the sub-pixel in plan view, the number of organic EL elements 11 and microlenses 41, etc. to be arranged can be determined according to display characteristics and the like.
- the flattening layer 50 absorbs the unevenness of the microlens 41 and flattens it, making it easier to bond the transparent substrate 70. Therefore, the maximum thickness of the planarization layer 50 is set to be equal to or greater than the height of the microlens 41.
- the planarization layer 50 has a refractive index lower than at least the refractive index of the microlens 41. The closer the refractive index of the flattening layer 50 is to the refractive index of air, the larger the difference in refractive index between the flattening layer 50 and the microlens 41 can be.
- the planarization layer 50 contains a hollow filler and a medium.
- the hollow filler and the medium have transparency at visible wavelengths, for example, have a total light transmittance of 90% or more for light at visible wavelengths.
- the hollow filler contributes to lowering the refractive index of the planarization layer 50.
- the medium is interposed between the particles of the hollow filler, binds the hollow fillers together, and stabilizes the flattening layer 50.
- hollow filler is silicon dioxide (silica, SiO 2 ).
- Hollow fillers made of silica are inexpensive, have high transparency to visible wavelengths, and physical stability. Since the hollow filler is located in the low refractive index layer, air regions are scattered inside the flattening layer 50, and as a result, the refractive index of the flattening layer 50 decreases, and as the content of the hollow filler increases, the refraction decreases. The rate approaches that of air.
- light emitted from the driven organic EL element 11 passes through the protective layer 20 and the color filter 30 and enters the microlens 41, and further passes through the flattening layer 50, the adhesive layer 60, and the transparent substrate. 70 and taken out to the outside.
- Shape of microlens 41 Pitch PD between hemispherical pixels (gap): 2.8 ⁇ m Film thickness of planarization layer 50: 1.2 ⁇ m Distance DH between organic EL element 11 and microlens 41: 2.6 ⁇ m (variable parameter) Shape of microlens 41 Shape 1 Height H: 1.1 ⁇ m, radius of curvature r of lens surface: 1.4 ⁇ m (r/H 1.27) Shape 2 Height H: 0.8 ⁇ m, radius of curvature r of lens surface: 1.6 ⁇ m (r/H 2.0) Shape 3 Height H: 0.6 ⁇ m, radius of curvature r of lens surface: 1.9 ⁇ m (r/H 3.17) Refractive index of microlens 41: 1.3 to 1.8 in 0.1 increments, refractive index of flattening layer 50: 1.1 to 1.5 in 0.1 increments, and no flattening layer 50 (lens array There is an adhesive layer 60 (
- FIGS. 3 to 5 The simulation results for shapes 1 to 3 are shown in FIGS. 3 to 5, respectively.
- FIG. 3 when the refractive index of the flattening layer 50 is 1.1 and the refractive index of the microlens 41 is 1.3, this indicates that the brightness is improved by 11% over the reference brightness. .
- FIG. 3 when the refractive index of the flattening layer 50 is 1.5 and the refractive index of the microlens 41 is 1.3, this indicates that the brightness has decreased by 35% from the reference brightness. .
- the optimal refractive index difference for shape 1 is 0.3
- the optimal refractive index difference for shapes 2 and 3 is 0.4 and 0.5, respectively, which are parallel to the value of r/H. It had changed to It has also been found that for any shape, if the refractive index difference is within the range of ⁇ 0.1 with respect to the above-mentioned optimum refractive index difference, a generally good brightness improvement effect can be obtained.
- nm means the refractive index of the microlens 41
- nt means the refractive index of the flattening layer 50, respectively.
- the preferable range of the refractive index difference is 0.2 or more and 0.5 or less, more preferably 0.2 or more and 0.5 or less. It was 4 or less.
- the preferred range of the refractive index difference is 0.3 or more and 0.6 or less, more preferably 0.3 or more and 0.5 or less.
- the suitable range of the refractive index difference is 0.3 or more, preferably 0.6 or more and 0.8 or less.
- the refractive index of the microlens 41 and the flattening layer 50, and the shape of the microlens 41 are set so as to satisfy the above formula (1). Even if the light source is not highly directional, such as the organic EL element 11, loss of emitted light can be suppressed and utilization efficiency can be improved. As a result, the light generated from the organic EL element 11 can be efficiently guided to the front of the device without being affected by the dimensions of the pixels, etc., and display quality such as brightness can be significantly improved.
- the present invention is not limited to a specific embodiment, and includes modifications and combinations of configurations within a range that does not depart from the gist of the present invention. Some changes are illustrated below, but these are not all, and other changes are also possible. Two or more of these changes may be combined as appropriate.
- the light source is not limited to the organic EL element 11 described above, and may be the micro LED 12 shown in FIG. 6 or another light source element.
- FIG. 6 shows a display device 1' according to a modification of one embodiment of the present invention.
- the same reference numerals are given to the same members as in the display device 1 according to an embodiment of the present invention, and the organic EL element 11 of the display device 1 according to the embodiment is a micro LED 12.
- the only difference from FIG. 1 is that Even in the case of such a display device 1', the same effects as the display device 1 can be obtained.
- the planar view shape of the microlens 41 is not limited to the circular shape shown in the above embodiment.
- the micro-lens 41 may have the same shape in plan view as the sub-pixel, such as a rectangle.
- the present invention it is possible to provide a display device that can suppress loss of emitted light from micro LEDs and organic EL elements and improve usage efficiency.
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- Electroluminescent Light Sources (AREA)
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Abstract
Description
本願は、2022年4月11日に、日本に出願された特願2022-065160号に基づき優先権を主張し、その内容をここに援用する。
また、特許文献2には、マイクロレンズ上に透光層を設けることで視野角特性を向上させることが記載されている。
この表示装置において、前記複数のマイクロレンズの屈折率nm、平坦化層の屈折率nt、および前記複数のマイクロレンズのレンズ面の曲率半径rと高さHとの比であるr/Hは、下記式1を満たす。
0.3<(nm-nt)-0.1(r/H)2+0.2(r/H)<0.6…(1)
平坦化層50上には、接着層60により透光性基板70が接合されており、使用者は、透光性基板70側から表示装置1に表示される画像を見ることができる。
保護層20は透明性を有し、有機EL素子11を保護するとともに、平坦化してカラーフィルタ30を設置しやすくする。保護層20は、複数の層で構成されてもよく、ガスバリア性を有してもよい。
保護層20内にサブ画素を区画する隔壁が形成されていてもよい。隔壁が形成されていることで、隣接するサブ画素への迷光を抑制できる。
本実施形態に係るマイクロレンズ41は、いわゆる平凸レンズであり、少なくとも空気や平坦化層50の屈折率よりも高い屈折率を有する。ここで、複数のマイクロレンズ41のそれぞれは、同一の屈折率を有すると見なして良い。
表示装置1の画素は、赤(R)・緑(G)・青(B)にそれぞれ対応する3つのサブ画素101、102、103で構成されている。各サブ画素101、102、103には、それぞれカラーフィルタ30を構成する赤の単色フィルタ30R、緑の単色フィルタ30G、および青の単色フィルタ30Bが配置されている。各サブ画素101、102、103に対して一つの有機EL素子11と3つのマイクロレンズ41が配置されている。
上記は一例であり、サブ画素の平面視形状や配置される有機EL素子11およびマイクロレンズ41の数等は、表示特性等に応じて決定できる。
(固定パラメータ)
マイクロレンズ41の形状:半球状
画素(ギャップ)間のピッチPD:2.8μm
平坦化層50の膜厚:1.2μm
有機EL素子11とマイクロレンズ41との距離DH:2.6μm
(変動パラメータ)
マイクロレンズ41の形状
形状1
高さH:1.1μm、レンズ面の曲率半径r:1.4μm(r/H 1.27)
形状2
高さH:0.8μm、レンズ面の曲率半径r:1.6μm(r/H 2.0)
形状3
高さH:0.6μm、レンズ面の曲率半径r:1.9μm(r/H 3.17)
マイクロレンズ41の屈折率:1.3から1.8まで0.1刻み、平坦化層50の屈折率:1.1から1.5まで0.1刻み、および平坦化層50なし(レンズアレイ40上に接着層60(屈折率1.7)が存在)
上記条件下において、マイクロレンズ41の屈折率を0.1ずつ変更して画素の正面方向における輝度を算出した。さらに、マイクロレンズ41の各形状1~3において、「マイクロレンズ41の屈折率1.6、平坦化層50なし」の条件における輝度を基準として輝度の向上率または低下率を算出した。
いずれの形状においても、平坦化層50の屈折率をマイクロレンズ41の屈折率よりも低くすることで、基準に対して輝度が向上する傾向が認められたが、平坦化層の屈折率が低すぎたりマイクロレンズ41の屈折率が高すぎたりすると輝度の向上効果が低下することや、両者の屈折率差の最適な範囲が形状により変化することなどが、全く予想外の知見として得られた。
0.3<(nm-nt)-0.1(r/H)2+0.2(r/H)<0.6…(1)
なお、式(1)において、nmはマイクロレンズ41の屈折率を、ntは平坦化層50の屈折率を、それぞれ意味する。
11 有機EL素子(光源)
20 保護層
30 カラーフィルタ
30R 単色フィルタ(赤の単色フィルタ)
30G 単色フィルタ(緑の単色フィルタ)
30B 単色フィルタ(青の単色フィルタ)
41 マイクロレンズ
50 平坦化層
60 接着層
70 透光性基板
Claims (6)
- 複数の光源が配置された素子基板と、
前記素子基板上に設けられ、前記複数の光源を覆う保護層と、
前記保護層上に設けられ、前記複数の光源に対応して配置された複数の単色フィルタを有するカラーフィルタと、
前記カラーフィルタ上に設けられ、前記複数の単色フィルタに対応して配置された複数のマイクロレンズを有するレンズアレイと、
前記レンズアレイ上に設けられて前記複数のマイクロレンズを覆っており、前記複数のマイクロレンズの屈折率よりも低い屈折率を有する平坦化層と、
を備え、
nmで表される前記複数のマイクロレンズの前記屈折率、ntで表される前記平坦化層の前記屈折率、および前記複数のマイクロレンズのレンズ面の曲率半径rと高さHとの比であるr/Hが下記式(1)を満たす、
表示装置。
0.3<(nm-nt)-0.1(r/H)2+0.2(r/H)<0.6…(1) - 前記r/Hが1以上2未満であり、
前記nmと前記ntとの差が0.2以上0.5以下である、
請求項1に記載の表示装置。 - 前記r/Hが2以上3未満であり、
前記nmと前記ntとの差が0.3以上0.6以下である、
請求項1に記載の表示装置。 - 前記r/Hが3以上であり、
前記nmと前記ntとの差が0.6以上0.8以下である、
請求項1に記載の表示装置。 - 複数の光源が配置された素子基板と、
前記素子基板上に設けられ、前記複数の光源を覆う保護層と、
前記保護層上に設けられ、前記複数の光源に対応して配置された複数の単色フィルタを有するカラーフィルタと、
前記カラーフィルタ上に設けられ、前記複数の単色フィルタに対応して配置された複数のマイクロレンズを有するレンズアレイと、
前記レンズアレイ上に設けられて前記複数のマイクロレンズを覆っており、前記複数のマイクロレンズの屈折率よりも低い屈折率を有する平坦化層と、
を備え、
前記複数のマイクロレンズのレンズ面の曲率半径rと高さHとの比であるr/Hが3以上であり、
前記複数のマイクロレンズの屈折率nmと前記平坦化層の屈折率ntとの差が0.3以上である、
表示装置。 - 前記光源が、有機EL素子またはマイクロLEDである、
請求項1から5のいずれか一項に記載の表示装置。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020247030331A KR20240170908A (ko) | 2022-04-11 | 2023-04-05 | 표시 장치 |
| EP23788226.1A EP4510114A4 (en) | 2022-04-11 | 2023-04-05 | DISPLAY DEVICE |
| CN202380026726.XA CN118871966A (zh) | 2022-04-11 | 2023-04-05 | 显示装置 |
| US18/910,480 US20250031547A1 (en) | 2022-04-11 | 2024-10-09 | Display unit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022-065160 | 2022-04-11 | ||
| JP2022065160A JP7806598B2 (ja) | 2022-04-11 | 2022-04-11 | 表示装置 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US18/910,480 Continuation US20250031547A1 (en) | 2022-04-11 | 2024-10-09 | Display unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2023199807A1 true WO2023199807A1 (ja) | 2023-10-19 |
Family
ID=88329646
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2023/014028 Ceased WO2023199807A1 (ja) | 2022-04-11 | 2023-04-05 | 表示装置 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20250031547A1 (ja) |
| EP (1) | EP4510114A4 (ja) |
| JP (1) | JP7806598B2 (ja) |
| KR (1) | KR20240170908A (ja) |
| CN (1) | CN118871966A (ja) |
| WO (1) | WO2023199807A1 (ja) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20250064955A (ko) * | 2023-11-03 | 2025-05-12 | 엘지디스플레이 주식회사 | 표시 장치 |
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| JP2022065160A (ja) | 2020-05-27 | 2022-04-26 | ニチハ株式会社 | 壁材の取付具 |
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| WO2011045904A1 (ja) * | 2009-10-15 | 2011-04-21 | パナソニック株式会社 | 表示パネル装置、表示装置および表示パネル装置の製造方法 |
| JP7486980B2 (ja) | 2020-02-28 | 2024-05-20 | キヤノン株式会社 | 発光装置、表示装置、露光システム、及び表示撮像装置 |
| CN110875369A (zh) * | 2019-11-27 | 2020-03-10 | 京东方科技集团股份有限公司 | 显示背板、显示面板及其制作方法和显示装置 |
| CN111864119B (zh) * | 2020-07-31 | 2024-01-19 | 京东方科技集团股份有限公司 | 显示器件和近眼显示设备 |
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| WO2011121668A1 (ja) * | 2010-03-31 | 2011-10-06 | パナソニック株式会社 | 表示パネル装置及び表示パネル装置の製造方法 |
| KR20120126562A (ko) * | 2011-05-12 | 2012-11-21 | 엘지디스플레이 주식회사 | 영상 표시장치 |
| JP2020184481A (ja) * | 2019-05-09 | 2020-11-12 | セイコーエプソン株式会社 | 表示装置、および電子機器 |
| JP2021015732A (ja) * | 2019-07-12 | 2021-02-12 | キヤノン株式会社 | 表示装置および表示システム |
| CN110928017A (zh) * | 2019-12-13 | 2020-03-27 | 武汉华星光电技术有限公司 | 显示面板 |
| US20210202917A1 (en) * | 2019-12-30 | 2021-07-01 | Lg Display Co., Ltd. | Display device and touch display device |
| WO2021171857A1 (ja) * | 2020-02-26 | 2021-09-02 | ソニーセミコンダクタソリューションズ株式会社 | 発光素子及び表示装置、並びに、表示装置の製造方法 |
| JP2022065160A (ja) | 2020-05-27 | 2022-04-26 | ニチハ株式会社 | 壁材の取付具 |
| WO2021261262A1 (ja) * | 2020-06-25 | 2021-12-30 | ソニーセミコンダクタソリューションズ株式会社 | 表示装置 |
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| EP4510114A1 (en) | 2025-02-19 |
| JP2023155685A (ja) | 2023-10-23 |
| JP7806598B2 (ja) | 2026-01-27 |
| CN118871966A (zh) | 2024-10-29 |
| EP4510114A4 (en) | 2025-08-27 |
| US20250031547A1 (en) | 2025-01-23 |
| KR20240170908A (ko) | 2024-12-05 |
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