Liquid crystal display module having different numbers of securing points to secure optical sheet to support

• US 7,248,307 B2
• Filed: 12/29/2003
• Issued: 07/24/2007
• Est. Priority Date: 03/17/2003
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Han, Sang Yub
• Primary Examiner(s): SCHECHTER, ANDREW M
• Application Number:
  US10/748,386
• Publication Number:
  US 20040183957A1
• Time in Patent Office: 1,303 Days
• Field of Search: 349 58- 60
• US Class Current: 349/58
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133317 Intermediate frames, e.g. between backlight housing and front frame
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G02F 2201/54 Arrangements for reducing warping-twist

Abstract

A liquid crystal display module is disclosed that has an optical sheet supported by a main support. In the module, the optical sheet is secured to a main support through a first securing point close to one corner at one side and secured to the main support through a second securing point close to each corner at the opposing side. In this liquid crystal display module, deformations in the optical sheet caused by applied heat from the light source is reduced or eliminated.

Claims

1. A liquid crystal display module, comprising:

a main support; and

an optical sheet secured to the main support through a first securing point close to one corner of a first diagonal line having a high thermal expansion coefficient of the optical sheet and secured to the main support through a second and third securing points close to corners of a second diagonal line having a low thermal expansion coefficient of the optical sheet,

wherein a number of securing points disposed so as to engage the first diagonal line is different from a number of securing points disposed so as to engage the second diagonal line.

2. The liquid crystal display module according to claim 1, wherein the main support includes a plurality of protrusions, the protrusions disposed at the first, second and third securing points.

3. The liquid crystal display module according to claim 2, wherein the optical sheet includes a plurality of holes into which the protrusions are inserted.

4. The liquid crystal display module according to claim 3, wherein the optical sheet includes a plurality of ears, the ears provided with the holes and protruding toward an outside of the optical sheet.

5. The liquid crystal display module according to claim 2, further comprising a guide panel for securing the optical sheets at an upper portion thereof.

6. The liquid crystal display module according to claim 5, wherein the guide panel includes a plurality of holes into which the protrusions are inserted.

7. The liquid crystal display module according to claim 1, further comprising:

a liquid crystal display panel supported by the main support; and

a light guide plate and a reflective sheet supported by the main support at a lower portion of the optical sheet.

8. The liquid crystal display module according to claim 1, wherein the optical sheet includes a dual brightness enhancement film (DBEF).

9. The liquid crystal display module according to claim 1, wherein the first securing point is disposed at a region less than 1/10 of an entire length of the optical sheet from the corners of the optical sheet.

10. The liquid crystal display module according to claim 1, wherein each of the first, second, and third securing points are disposed at a region less than 1/10 of an entire length of the optical sheet from the corners of the optical sheet.