Optical plate, display apparatus having the same, and method of manufacturing the optical plate

A display apparatus, comprising:

• a display panel having a top and a bottom surface;
• a light source for radiating light;
• a light guide plate a top surface and a bottom surface and being disposed between the display panel and the light source, and capable of guiding the light;
• and
• an optical plate disposed between the light guide plate and the display panel capable of focusing the light,
• wherein the optical plate comprises:
• a supporting sheet having a top and a bottom surface;
• a first optical layer having a first refractive index and contacting the bottom surface of the supporting sheet, the first optical layer having a plurality of first protruding portions, having an indented region disposed between each adjacent pair of first protruding portions, the first protruding portions contacting the bottom surface of the first optical layer, wherein each of the first protruding portions has a first cross section perpendicular to the bottom surface of the first optical layer, the first cross section being a first portion of a triangular prism;
• a second optical layer having a top and a bottom surface and filling indented regions formed between adjacent first protruding portions wherein no space remains between the first and second optical layers the second optical layer having a second refractive index, wherein the second refractive index is higher than the first refractive index;
• and
• a third optical layer having a top and a bottom surface, the third optical layer contacting the top surface of the supporting sheet and having a plurality of second protruding portions on the top surface and having a third refractive index;
• wherein the third refractive index is lower than the second refractive index, and the third refractive index is the same as the first refractive index,
• wherein each of the second protruding portions has a second cross section perpendicular to the bottom surface of the third optical layer, the second cross section being a portion of a triangular prism;
• and
• wherein the first protruding portion of the triangular prism has a first vertex angle, the first vertex angle being in a range from about 75 degrees to about 80 degrees.

An optical plate, comprising:

• a supporting sheet having a top surface and a bottom surface;
• a first optical layer comprising a transparent polymer resin disposed on the bottom surface of the supporting sheet, the first optical layer having a top and a bottom surface, the bottom surface having a plurality of first protruding portions, wherein each of the first protruding portions has a first cross section perpendicular to the bottom surface of the first optical layer, the first cross section being a first portion of a triangular prism;
• the first optical layer having a first refractive index in a range from about 1.43 to about 1.54;
• a second optical layer contacting the bottom surface of the first optical layer and covering the first protruding portions having and filling indented regions formed between adjacent first protruding portions wherein no space remains between the first and second optical layers, the second optical layer having a second refractive index, wherein the second refractive index is higher than the first refractive index and in a range from about 1.58 to about 1.62;
• and
• a third optical layer having a top and a bottom surface, the bottom surface contacting and covering the top surface of the supporting sheet, the third optical layer having a plurality of second protruding portions on its top surface and having a third refractive index, wherein the third refractive index is lower than the second refractive index and the third refractive index is the same as the first refractive index,
• wherein each of the second protruding portions has a second cross section perpendicular to the bottom surface of the third optical layer, the second cross section being a portion of a triangular prism,
• wherein each of the top surface of the first optical layer and the bottom surface of the second optical layer has an unevenness having a surface roughness in a range of about 0.1 micrometers to about 50 micrometers;
• and
• wherein the first protruding portion of the triangular prism has a first vertex angle, the first vertex angle being in a range from about 75 degrees to about 80 degrees.

A display apparatus, comprising:

• a display panel having a top surface and a bottom surface;
• a light source for radiating light;
• a light guide plate having a top surface and a bottom surface and being disposed between the display panel and the light source, and capable of guiding the light;
• and
• an optical plate disposed between the light guide plate and the display panel capable of focusing the light,
• wherein the optical plate comprises:
• a supporting sheet having a top surface and a bottom surface;
• a first optical layer comprising a transparent polymer resin disposed on the bottom surface of the supporting sheet, the first optical layer having a top and a bottom surface, the bottom surface having a plurality of first protruding portions, wherein each of the first protruding portions has a first cross section perpendicular to the bottom surface of the first optical layer, the first cross section being a first portion of a triangular prism;
• the first optical layer having a first refractive index in a range from about 1.43 to about 1.54;
• a second optical layer contacting the bottom surface of the first optical layer, covering the first protruding portions having and filling indented regions formed between adjacent first protruding portions wherein no space remains between the first and second optical layers, the second optical layer having a second refractive index, wherein the second refractive index is higher than the first refractive index and in a range from about 1.58 to about 1.62;
• and
• a third optical layer having a top and a bottom surface, the bottom surface contacting and covering the top surface of the supporting sheet, the third optical layer having a plurality of second protruding portions on its top surface and having a third refractive index, wherein the third refractive index is lower than the second refractive index and the third refractive index is the same as the first refractive index,
• wherein each of the second protruding portions has a second cross section perpendicular to the bottom surface of the third optical layer, the second cross section being a portion of a triangular prism, and
• wherein the first protruding portion of the triangular prism has a first vertex angle, the first vertex angle being in a range from about 75 degrees to about 80 degrees.

An optical plate, comprising:

• a supporting sheet having a top surface and a bottom surface;
• a first optical layer disposed on a bottom surface of the supporting sheet, the first optical layer having a first refractive index and a top and a bottom surface, the bottom surface having a plurality of first protruding portions, wherein each of the first protruding portions has a first cross section perpendicular to the bottom surface of the first optical layer, the first cross section being a first portion of a triangular prism;
• a second optical layer contacting the bottom surface of the first optical layer, covering the first protruding portions having and filling indented regions formed between adjacent first protruding portions wherein no space remains between the first and second optical layers, the second optical layer having a second refractive index, wherein the second refractive index is higher than the first refractive index;
• a third optical layer having a top and a bottom surface, the bottom surface contacting and covering the top surface of the supporting sheet, the third optical layer having a plurality of second protruding portions on its top surface and having a third refractive index, wherein the third refractive index is lower than the second refractive index and the third refractive index is the same as the first refractive index;
• and
• wherein the second protruding portion of the triangular prism has a second vertex angle, the second vertex angle being in a range from about 75 degrees to about 90 degrees.