# US 9,435,927 B2 · Guide plate and backlight assembly including the same

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- Number: US 9,435,927 B2
- Document ID: US9435927B2
- Status: Granted
- Kind: B2
- Application number: 14/187,078
- Filed: 2014-02-21
- Published: 2015-04-09
- Granted: 2016-09-06
- Earliest claimed: 2013-10-08
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Min Young Song; Dong Yeon Kang; Rae Young Kim; Joo Young Kim; Hyoung Joo Kim; Sung Kyu Shim
- Web page: https://patentgrep.com/patent/US9435927B2

## CPC

- G02B 6/002: {by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces}
- G02B 6/0028: {Light guide, e.g. taper}
- G02B 6/0031: {Reflecting element, sheet or layer}
- G02B 6/0073: {Light emitting diode [LED]}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

Disclosed is a light guide plate including a base sheet and a first light transmissive adhesive layer disposed on a surface of the base sheet. The first light transmissive adhesive layer together with the base sheet define a light entrance portion. The thickness of the first light transmissive adhesive layer becomes gradually smaller from the light entrance portion toward a center portion of the base sheet. A backlight assembly includes the light guide plate.

## Claims

### Claim 1

A backlight assembly comprising:
a light guide plate having a light entrance portion; and
a light source disposed to face the light entrance portion of the light guide plate and configured to irradiate light to the light entrance portion, wherein the light source comprises:
a printed circuit board; and
a plurality of light emitting diodes electrically connected to the printed circuit board and spaced apart from each other,
wherein the light guide plate comprises:
a base sheet;
a first light transmissive adhesive layer disposed on one surface of the base sheet, the first light transmissive adhesive layer together with the base sheet defining the light entrance portion, wherein the first light transmissive adhesive layer comprises silicone-based adhesive, and the thickness of the first light transmissive adhesive layer becomes gradually smaller from the light entrance portion toward a center portion of the base sheet, wherein the light source includes a light exit surface facing the light entrance portion of the light guide plate, a thickness of the light entrance portion is greater than a height of the light exit surface, and a thickness of the base sheet is smaller than the height of the light exit surface;
a reflective sheet on the first light transmissive adhesive layer; and
a second adhesive layer on the reflective sheet, the second adhesive layer being bonded to the printed circuit board.

### Claim 2 (depends on 1)

The backlight assembly of claim 1, wherein a difference in refractive index between the base sheet and the first light transmissive adhesive layer is less than about 0.05.

### Claim 3 (depends on 1)

The backlight assembly of claim 1, wherein the base sheet has a refractive index in a range of about 1.45 to about 1.65, and the first light transmissive adhesive layer has a refractive index in a range of about 1.4 to about 1.65.

### Claim 4 (depends on 1)

The backlight assembly of claim 1, wherein the base sheet has a thickness of about 0.2 mm to about 0.5 mm.

### Claim 5 (depends on 1)

The backlight assembly of claim 1, wherein the light entrance portion has a thickness of about 0.3 mm to about 0.8 mm.

### Claim 6 (depends on 1)

The backlight assembly of claim 1, wherein the base sheet comprises at least one of polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene (PS), and polyethylene terephthalate (PET).