Lighting device
AssigneeJapan Display Inc.
InventorsMakoto Hasegawa, Nobuyuki Suzuki, Masafumi Okada
Life of this patent
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Abstract
The purpose of the present invention is to realize a lighting device of thin, low power consumption and small light distribution angle. The present invention takes the following structure to realize the above task: A lighting device comprising: a disc shaped light guide, having a main surface and a rear surface, including a first hole at a center, a disc shaped reflection sheet, disposed at the rear surface side of the light guide, including a second hole at a center, a prism sheet, disposed at the main surface side of the light guide, including a concentric first prism array, wherein a reflection mirror is set in the first hole of the light guide at the side near to the prism sheet, an LED is set opposing to the reflection mirror.
Claims7
A lighting device comprising:
- a light guide plate including a main surface and a rear surface;
- a reflection sheet disposed at the rear surface side of the light guide plate;
- and
- a prism sheet opposed to the main surface of the light guide plate;
- wherein
- the light guide plate is disk shaped, and includes a first hole at a center,
- the reflection sheet is disk shaped, and includes a second hole at a center,
- the prism sheet is disk shaped, and the prism sheet includes a first prism array opposing to the light guide plate,
- a reflection mirror is set in the first hole of the light guide,
- a light source is set in the second hole of the reflection sheet and facing to the reflection mirror,
- the light guide plate includes a second prism array on the main surface, and a third prism array on the rear surface,
- the first prism array is formed concentrically,
- the second prism array is formed radially, and
- the third prism array is formed concentrically.
Dependencies are inferred from the claim text.