US 2023/0056516 A1Published application

Lighting device

AssigneeJapan Display Inc.

InventorsMakoto HASEGAWA, Masafumi OKADA

Life of this patent

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Abstract

A lighting device including: a light guide having a first side surface extending in a first direction and a second side surface opposing to the first side surface and extending in the first direction, a first LED being disposed at the first side surface, a second LED being disposed at the second side surface; in which a first area extends in the first direction and a second area extends in the second direction in the light guide; a prism sheet is disposed on the light guide; a prism extending in the first direction and arranged in the second direction is formed on the prism sheet; a first surface of the prism has a first angle with normal direction of the second prism sheet; a second surface of the prism has a second angle with normal direction of the second prism sheet; the first angle is larger than the second angle.

Claims4

Dependent claims

A lighting device comprising:

a light guide having a first side surface extending in a first direction and a second side surface opposing to the first side surface and extending in the first direction,
a first LED being disposed at the first side surface,
a second LED being disposed at the second side surface,
wherein an area in which the first LED is disposed and extends in the second direction is defined as a first area,
an area in which the second LED is disposed and extends in the second direction is defined as a second area,
a prism sheet is disposed on the light guide,
a prism extending in the first direction and arranged in the second direction is formed on the prism sheet,
the prism has a first plane extending along the first direction and a second plane extending along the first direction, and is triangular in cross sectional view along the second direction, and
a first angle between the first plane and the normal line to a base of the triangle is smaller than a second angle between the second plane and the normal line to the base of the triangle.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/979,788Filed 3 Nov 2022
Priority: JP 2021-04571419 Mar 2021
Published: 23 Feb 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G02B 6/0053
Provided by one optical element, or plurality thereof, placed on the light output side of the light guide: prismatic sheet or layer; Brightness…
G02B 6/0073
Characterised by the light source being coupled to the light guide: light emitting diode [LED]
G02B
Optical elements, systems or apparatus

Family

Application17/696,965Continuation · filed 17 Mar 2022
Application17/979,788Continuation
US 11,513,279 B2Related patent
US 11,789,193 B2Related patent
US 2022/0299697 A1Published application
US 2023/0056516 A1This patent

From the US filing history. Foreign family members aren’t listed.

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