Display device and method for manufacturing optical film

A display device comprising:

• a display panel that emits light from a plurality of pixels arrayed at predetermined pixel array pitches;
• and
• 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, that the first and second optical functional parts are arrayed at the functional part array pitches q in a direction identical to a direction in which the plurality of pixels are arrayed at the pixel array pitches p, 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.

A method for manufacturing an optical film that is placed over a display panel and a circularly polarizing plate,

• wherein the display panel emits light from a plurality of pixels arrayed at predetermined pixel array pitches smaller than or equal to 155 μm,
• wherein the circularly polarizing plate is located between the display panel and the optical film,
• wherein the display panel is an organic LED panel,
• wherein the optical film including 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,
• 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 the method comprises the steps of:
• determining the pixel array pitches p (μm);
• determining a distance d (μm) 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, the distance d (μm) being a distance at which the optical film is placed over the display panel;
• and
• determining the functional part array pitches as q (μm) so that q≤0.5p and tan (asin (0.7/q))<p/d hold,
• wherein the optical film is manufactured on the basis of the functional part array pitches q (μm) thus determined.