Bottom lighting backlight module having uniform illumination and process for manufacturing the same
AssigneeNational Chiao Tung University
InventorsChih-Hua Feng, Mao-Hong Lu
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Abstract
The present invention provides a bottom lighting backlight module comprising: a light reflecting plate, a plurality of light sources such as lamp and LED; and a diffusion sheet; wherein said diffusion sheet has an excavated structure of parallel arranged tubular shape with polygon (particularly, a triangular) cross-section. Some of the light incident on the excavated structure inside the diffusion sheet can be totally reflected and redirected sideways, so that it is possible to reduce the local brightness for area around each light source but significantly improve the evenness of brightness for the whole module.
Claims5
A bottom lighting backlight module comprising a plurality of light sources and a wedge-shaped diffusion sheet;
- wherein said diffusion sheet has an excavated structure of parallel arranged tubular shape with polygon (particularly, a triangular) cross-section, some of the light emitted from light source that entering the excavated area inside the diffusion sheet can be totally reflected and redirected toward both sides by said excavated structure, so that it is possible to reduce the local brightness for area around each light source but significantly improve the evenness of brightness for the whole module.
Dependencies are inferred from the claim text.