Method for fabricating a reflective plate of a reflective or transflective LCD with improved angular reflectivity
View Patent ↗Disclosed is a reflective plate of an LCD including a reflective surface, and a plurality of reflective bumps arranged the reflective surface, wherein each of the plurality of bumps forms a part of a sphere, wherein the bumps have a radius and a height, and wherein a ratio of the radius to the height for each of the bumps is a fixed value.
1. A method for fabricating a reflective plate of an LCD, the method comprising the steps of:
depositing a first photosensitive organic insulating layer on an entire surface of an insulating substrate on which a switching device including a source electrode, a drain electrode and a gate electrode is formed, at a predetermined thickness;
exposing and etching the first organic insulating layer by using a mask having a light transmitting region to form a plurality of first bumps each having a partial sphere shape;
coating a second organic insulating layer on the first organic insulating layer to form a plurality of second bumps, a second bump within the plurality having an infection point, wherein the second bump has a first height (Ha) from the inflection point to the top of the bump and a second height (Hb) from the inflection point to the bottom of the bump, and wherein the ratio (Ha+Hb) to Ha ranges from 2:1 to 1:1; and
depositing a reflective metal on the second organic insulating layer having the plurality of second bumps.
2. The method according to claim 1 , wherein the radius of the second bump ranges from 3 μm to 20 μm.
3. The method according to claim 1 , wherein a ratio of the radius to the height of the second bump ranges from 20:1 to 7:1.
4. The method according to claim 1 , wherein a ratio of the radius to the height of the second bump is about 10:1.
5. The method according to claim 1 , wherein the first photosensitive organic insulating layer includes one of BCB, Acryl, Aerogel, and microfoam.