Reflector, liquid crystal display device having reflector, method of manufacturing reflector, and method of manufacturnig liquid crystal display device
A reflector for reflecting incident light from outside includes an insulating film being formed on a substrate and including multiple concavities and convexities, and a metal film formed on the insulating film. Respective convex portions constituting the multiple concavities and convexities are formed into shapes in which positions of peak portions relative to the entire convex portions are tilted in one direction when viewed from a direction of a normal line of the substrate.
1. A method of manufacturing a reflector for reflecting incident light from outside comprising the steps of:
coating photosensitive resin on a substrate;
exposing the photosensitive resin by use of a photomask, the photomask including a light-shielding region where a piece of a pattern is formed in a size equal to or larger than a resolution limit,
a first transmissive region where a piece of a pattern is formed in a size smaller than the resolution limit, and
a second transmissive region having higher optical transmittance than the first transmissive region, wherein a part of the first transmissive region is located between the light-shielding region and the second transmissive region;
performing development of the photosensitive resin after the exposure and then forming three regions having different film thicknesses;
subjecting the photosensitive resin to a heat treatment after the development; and
forming a reflective film on the photosensitive resin after the heat treatment.
2. The method of manufacturing a reflector according to claim 1 , wherein
the photomask comprises a pattern in which any of polygons, circles, and ellipses are arranged in a plane direction,
sides of any of the polygons, circles, and ellipses constitute the light-shielding region, and
the first transmissive region is located adjacent to the light-shielding region.
3. The method of manufacturing a reflector according to claim 1 , wherein
the photomask comprises a pattern in which any of wavy lines and winding lines are arranged in a plane direction,
any of each of the wavy lines and of the winding lines constitutes the light-shielding region, and
the first transmissive region is located adjacent to the light-shielding region.
4. The method of manufacturing a reflector according to claim 1 , wherein
the photomask comprises a pattern in which any of polygons, circles, and ellipses are arranged in a plane direction,
a side of any of each polygon, circle, and ellipse constitutes the second transmissive region, and
the first transmissive region and the light-shielding region are located adjacent to each other in areas surrounded by sides of any of the polygons, circles, and ellipses.
5. The method of manufacturing a reflector according to claim 1 , wherein
the photomask comprises a pattern in which any of wavy lines and winding lines are arranged in a plane direction,
any of each wavy line and winding line constitutes the second transmissive region, and
the first transmissive region and the light-shielding region are located adjacent to each other at portions other than any of the wavy lines and winding lines.
6. The method of manufacturing a reflector according to claim 1 , wherein a piece size of the pattern is smaller than the resolution limit, and the pattern is changed stepwise in the first transmissive region.
7. The method of manufacturing a reflector according to claim 1 , wherein a light-shielding pattern is not formed in the second transmissive region.