US 12,490,637 B2
Display device and method for manufacturing optical film
Tsuyoshi Kashiwagi, Tokyo (JP); Shinsuke Nakazawa, Tokyo (JP); and Takahiro Takeshima, Tokyo (JP)
Assigned to Dai Nippon Printing Co., Ltd., Tokyo (JP)
Appl. No. 17/905,263
Filed by Dai Nippon Printing Co., Ltd., Tokyo (JP)
PCT Filed Mar. 12, 2021, PCT No. PCT/JP2021/010146
§ 371(c)(1), (2) Date Aug. 30, 2022,
PCT Pub. No. WO2021/182620, PCT Pub. Date Sep. 16, 2021.
Claims priority of application No. 2020-044520 (JP), filed on Mar. 13, 2020; and application No. 2021-021092 (JP), filed on Feb. 12, 2021.
Prior Publication US 2023/0093069 A1, Mar. 23, 2023
Int. Cl. H10K 59/80 (2023.01); G02F 1/1335 (2006.01)
CPC H10K 59/879 (2023.02) [G02F 1/133507 (2021.01)] 4 Claims
OG exemplary drawing
 
1. A display device comprising:
a display panel that emits light from a plurality of pixels arrayed at predetermined pixel array pitches;
an optical film, placed over the display panel so as to allow passage of light from the plurality of pixels, that includes first and second optical functional parts differing in refractive index from each other, the first and second optical functional parts being arrayed at a certain functional part array pitch; and
a circularly polarizing plate between the display panel and the optical film,
wherein the display panel is an organic LED panel,
wherein the pixel array pitches are smaller than or equal to 155 μm,
wherein the second optical functional part has a flat top-end surface and a side surface between the top-end surface and a base end thereof, the side surface having an arc shape that is convex toward the first optical functional part, and
wherein assuming that p (μm) denotes the pixel array pitches, that q (μm) denotes the functional part array pitches, and that d (μm) denotes a distance in a face-to-face direction between surfaces of the pixels that face the optical film and a surface of the optical film that faces the pixels, q≤0.5p and tan (asin (0.7/q))<p/d hold.