LIQUID CRYSTAL DISPLAY APPARATUS

• US 20070279728A1
• Filed: 01/18/2007
• Published: 12/06/2007
• Est. Priority Date: 06/02/2006
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: MURAKATA, Masato
• Granted Patent: US 7,626,747 B2
• Time in Patent Office: Days
• US Class Current: 359/245
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• 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 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 2201/503 Arrangements improving the resistance to shock
• CPC Class Codes: G02F 2201/54 Arrangements for reducing warping-twist

Abstract

A liquid crystal display apparatus includes an optical sheet for uniformly diffusing light toward a light-emitting face, and a resin frame onto which the optical sheet is attached. The optical sheet has the first fixing portion or the second fixing portion. The optical sheet is attached to the resin frame by fitting the first fixing portion or the second fixing portion to a concavity created at the resin frame at a part corresponding to the first fixing portion or the second fixing portion. At least one notch is created at a boundary area between a display area of the optical sheet and the first fixing portion or the second portion so that deformation in the optical sheet caused by a significant mechanical stress, such as drop impact, does not extend to the display area.

Claims

1. A liquid crystal display apparatus, comprising:

a light guide plate for leading light from a light source;

an optical sheet for uniformly diffusing the light from the light source led by the light guide plate toward a light-emitting face; and

a resin frame onto which the optical sheet is attached;

wherein

a first fixing portion, provided at one side of the optical sheet, is fitted into a concavity created at the resin frame to be secured at the resin frame;

a second fixing portion, provided at a side opposite the side at which the first fixing portion is provided, is fitted into a concavity created at the resin frame at a part corresponding to the second fixing portion so that the optical sheet is attached to the resin frame; and

at least one notch is created at a longer direction of one of the first fixing portion and the second fixing portion at a boundary area between a display area of the optical sheet and at least one of the first fixing portion and the second fixing portion.

2. The liquid crystal display apparatus of claim 1, wherein another notch is created at one of the first fixing portion and the second fixing portion at a side opposite the side of one of the first fixing portion and the second fixing portion where the notch is created.

3. The liquid crystal display apparatus of claim 1, wherein one of the first fixing portion and the second fixing portion without notch is secured at the resin frame with a double-sided tape.

4. The liquid crystal display apparatus of claim 1, wherein the notch is a rectangular notch.

5. The liquid crystal display apparatus of claim 1, wherein the notch is one of semi-circular notch and triangular notch.

6. The liquid crystal display apparatus of claim 1, further comprising:

a reflection sheet at an opposite side of a light-emitting face relative to the light guide plate,

wherein

a third fixing portion is provided at one side of at least one of the light guide plate and the reflection sheet, the third fixing portion being fitted to the concavity created at the resin frame to be secured at the resin frame,

a fourth fixing portion is provided at a side opposite the side at which the third fixing portion is provided, the fourth fixing portion being fitted into the concavity created at the resin frame at a part corresponding to the fourth fixing portion so that the light guide plate and the reflection sheet are attached to the resin frame, and

at least one notch is created at a longer direction of one of the third fixing portion and the fourth fixing portion at a boundary area between a display area of one of the light guide plate and the reflection sheet and one of the third fixing portion and the fourth fixing portion.

7. The liquid crystal display apparatus of claim 1, wherein a positioning area of one of the first fixing portion and the second fixing portion where the notch is created has a protrusion, the protrusion being formed in a way such that to contact the concavity.

8. The liquid crystal display apparatus of claim 7, wherein the protrusion of the positioning area is a substantially semi-circular protrusion.

9. The liquid crystal display apparatus of claim 7, wherein the protrusion of the positioning area is divided into a plurality of rectangular protrusions.

10. The liquid crystal display apparatus of claim 7, wherein the protrusion of the positioning area is a trapezoidal protrusion protruding toward the concavity, and a curved portion is formed at the concavity so as to contact the protrusion.

11. The liquid crystal display apparatus of claim 7, wherein the protrusion of the positioning area is a substantially semi-circular protrusion protruding toward the concavity, and a curved portion is formed at the concavity so as to contact the protrusion.

12. The liquid crystal display apparatus of claim 1, wherein one of the first fixing portion and the second fixing portion further comprises a plurality of protrusions contacting a wall of the concavity, the wall being parallel to the boundary area.

13. A liquid crystal display apparatus, comprising:

a light guide plate for leading light from a light source

an optical sheet for uniformly diffusing the light of the light source led by the light guide plate toward a light-emitting face; and

a resin frame onto which the optical sheet is attached,

wherein

a first fixing portion, provided at one side of the optical sheet, is fitted into a concavity created at the resin frame to be secured at the resin frame,

a second fixing portion, provided at a side opposite the side at which the first fixing portion is provided, is fitted into a concavity created at the resin frame at a part corresponding to the second fixing portion so that the optical sheet is attached to the resin frame,

a positioning area of at least one of the first fixing portion and the second fixing portion has a protrusion protruding toward the concavity at the resin frame,

the resin frame has a curved portion at the concavity, the curved portion being formed corresponding to the protrusion, and

the protrusion and the curved portion are engaged.

14. The liquid crystal display apparatus of claim 13, wherein one of the first fixing portion and the second fixing portion without the protrusion at the positioning area is secured at the resin frame with a double-sided tape.

15. The liquid crystal display apparatus of claim 13, wherein the protrusion of the positioning area is an L-shaped protrusion protruding toward the concavity.

16. The liquid crystal display apparatus of claim 13, wherein the protrusion at the positioning area is a T-shaped protrusion protruding toward the concavity, and the curved portion at the concavity is a T-curved portion formed so as to correspond to the protrusion and surround the T-shaped protrusion.

17. The liquid crystal display apparatus of claim 13, further comprising:

a reflection sheet on an opposite side of the light-emitting face relative to the light guide plate,

wherein

a third fixing portion is provided at one side of one of the light guide plate and the reflection sheet, the third fixing portion being fitted into the concavity created at the resin frame to be secured at the resin frame,

a fourth fixing portion is provided at a side opposite the side at which the third fixing portion is provided, the fourth fixing portion being fitted into the concavity created at the resin frame at a part corresponding to the fourth fixing portion so that the light guide plate and the reflection sheet are attached to the resin frame,

a positioning area of at least one of the third fixing portion and the fourth fixing portion has a protrusion protruding toward the concavity at the resin frame,

the resin frame has a curved portion at the concavity, the curved portion being formed corresponding to the protrusion, and

the protrusion and the curved portion are engaged.