Plane light source and LCD backlight unit having the same

Details Plane light source and LCD backlight unit having the same Plane light source and LCD backlight unit having the same

2011-05-10

2011-05-10

Nelms, David (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

Reexamination Certificate

active

07940350

ABSTRACT:
There are provided a plane light source and an LCD backlight unit having the same. A plane light source having a plurality of light emitting devices arranged in a light emitting device matrix having rows and columns at a substrate according to an aspect of the invention includes a first matrix having a plurality of light emitting devices arranged in rows and columns; and a second matrix having a plurality of light emitting devices arranged in rows and columns, each of the light emitting devices located within a quadrangle formed by four neighboring light emitting devices included in the first matrix, wherein a pitch S between one light emitting device included in the light emitting device matrix and another light emitting device most adjacent to the one light emitting device satisfies the following equation to obtain uniform luminance distribution at a position distant from a light emitting surface of the light emitting device by an optical length l,S≤l2×tan⁡(θ2+α),Equationwhere −π/18≦α≦π/18 is satisfied, and θ is an orientation angle of the light emitting device.

REFERENCES:
patent: 7002546 (2006-02-01), Stuppi et al.
patent: 7671936 (2010-03-01), Chang
patent: 2002/0047903 (2002-04-01), Shibuya et al.
patent: 2006/0279671 (2006-12-01), Han et al.
patent: 2007-42511 (2007-02-01), None
patent: 20-0361394 (2004-08-01), None
patent: 10-2004-0086604 (2004-10-01), None
patent: 10-2006-0051465 (2006-05-01), None
Korean Office Action, with English translation issued in Korean Patent Application No. KR 10-2007-0046845 dated on May 27, 2008.
Communication dated Jan. 4, 2011, issued in counterpart Japanese Application No. 2008-127401.

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