US 10,295,730 B2Granted

Light bar for back light unit containing resistance modulated LED strings

AssigneeGlo AB

InventorsMiljenko Modric, Kazunori Okui, Clinton Carlisle

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Abstract

A light bar includes a plurality of first color light emitting LEDs including a first subset of first color light emitting LEDs and a second subset of first color light emitting LEDs, a plurality of second color light emitting LEDs, where the second color is different from the first color, and a plurality of third color light emitting LEDs, where the third color is different from the first and the second colors. The second subset of first color light emitting LEDs are electrically connected in series with a larger electrical load than the first subset of first color light emitting LEDs. This light bar electrical configuration allows compensation and correction for locations on the light guide plate used in back light units where imperfect mixing of the 3 primary colors provided by the individual LED emitters on the light bar occurs.

Claims20

Dependent claims

A device, comprising:

a plurality of first color light emitting LEDs comprising a first subset of first color light emitting LEDs and a second subset of first color light emitting LEDs;
a plurality of second color light emitting LEDs, wherein the second color is different from the first color;
and
a plurality of third color light emitting LEDs, wherein the third color is different from the first and the second colors;
wherein the second subset of first color light emitting LEDs is electrically connected in series with a larger electrical load between a first electrical connector and a second electrical connector than the first subset of first color light emitting LEDs between the first electrical connector and the second electrical connector to provide a lesser electrical current through each string of first color light emitting LEDs within the second subset of first color light emitting LEDs than electrical current provided through each string of first color light emitting LEDs within the first subset of first color light emitting LEDs.

2 more elements

A method of operating a device, comprising:

emitting a first color light from a plurality of first color light emitting LEDs comprising a first subset of first color light emitting LEDs and a second subset of first color light emitting LEDs;
emitting a second color light from a plurality of second color light emitting LEDs, wherein the second color is different from the first color;
and
emitting a third color light from a plurality of third color light emitting LEDs, wherein the third color is different from the first and the second colors;
wherein the second subset of first color light emitting LEDs is electrically connected in series with a larger electrical load between a first electrical connector and a second electrical connector than the first subset of first color light emitting LEDs between the first electrical connector and the second electrical connector to provide a lesser electrical current provided through each string of first color light emitting LEDs within the second subset of first color light emitting LEDs than electrical current through each string of first color light emitting LEDs within the first subset of first color light emitting LEDs.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/236,760Filed 15 Aug 2016 · us provisional application
Priority: 18 Aug 2015
Published: US 2017/0052313 A123 Feb 2017
Granted: 21 May 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G02B 6/0073
Characterised by the light source being coupled to the light guide: light emitting diode [LED]
G02B 6/0068
Characterised by the light source being coupled to the light guide: arrangements of plural sources, e.g. multi-colour light sources
G02B 6/0083
Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides,…:…
G02F 1/1335
Constructional arrangements; Manufacturing methods: structural association of cells with optical devices, e.g. polarisers or reflectors