Light guide plate, method of manufacturing the same, and liquid crystal display device including the same
View Patent ↗A light guide plate includes a light incident surface to which light is incident as incident light, an opposite surface formed opposite to the light incident surface, a light emitting surface through which the incident light is emitted, a rear surface formed opposite to the light emitting surface and including a prism pattern which reflects the incident light to the light emitting surface, and lateral surfaces, wherein a diffuse reflection pattern is formed on at least any one of the light emitting surface and the lateral surfaces to diffuse-reflect light incident to the lateral surfaces, thus rendering a brightness at both the opposite surface and the light incident surface substantially uniform.
1. A light guide plate comprising:
a light incident surface to which light is incident as incident light;
an opposite surface formed opposite to the light incident surface;
a light emitting surface through which the incident light is emitted;
a rear surface formed opposite to the light emitting surface and including a prism pattern to reflect the incident light to the light emitting surface; and
lateral surfaces,
wherein a diffuse reflection pattern is formed on at least any one of the light emitting surface and the lateral surfaces to diffuse-reflect light incident to the lateral surfaces, thus rendering a brightness adjacent both the opposite surface and the light incident surface substantially uniform,
wherein the rear surface further comprises at least one reflection pattern formed in a prism shape spaced apart from and interposed between prism lines defining the prism pattern to reflect light to the light emitting surface,
wherein the reflection pattern has a height from the rear surface different from a height of the prism lines defining the prism pattern from the rear surface.
2. The light guide plate of claim 1 , wherein the reflection pattern is formed within a region of the rear surface occupying about 10% of a length between the lateral surfaces, and the region is disposed adjacent at least one of the lateral surfaces.
3. The light guide plate of claim 2 , wherein the reflection pattern is formed in any one of relief and intaglio patterns.
4. The light guide plate of claim 3 , wherein the reflection pattern has a vertex angle in a range of about 130° to about 140°.
5. The light guide plate of claim 4 , wherein the reflection pattern has a height in a range of about 1 μm to about 10 μm from the rear surface and a width in a range of several tens to several hundreds of micrometers.
6. The light guide plate of claim 5 , wherein a number of reflection patterns increases as a distance increases from the light incident surface toward the opposite surface.
7. The light guide plate of claim 5 , wherein at least any one of the height and the width of the reflection pattern gradually increases as a distance increases from the light incident surface toward the opposite surface.
8. The light guide plate of claim 1 , wherein the reflection pattern is formed as a projection extending from the rear surface and formed spaced apart from and interposed between intaglio prism lines defining the prism pattern.