Liquid crystal display device

• US 7,626,653 B2
• Filed: 02/07/2008
• Issued: 12/01/2009
• Est. Priority Date: 02/08/2007
• Status: Expired due to Fees

• Current Assignee: Funai Electric Co., Ltd.
• Original Assignee: Funai Electric Co., Ltd.
• Inventors: Zensai, Atsunori
• Primary Examiner(s): Doan; Jennifer
• Application Number:
  US12/068,551
• Publication Number:
  US 20090009680A1
• Time in Patent Office: 663 Days
• Field of Search: 349/1, 349/13, 349/14, 349/56, 349/58
• 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 1/133322 Mechanical guidance or alignment of LCD panel support components
• CPC Class Codes: G02F 1/133328 Segmented frames
• CPC Class Codes: G02F 1/133608 including particular frames or supporting means
• CPC Class Codes: G02F 2201/46 Fixing elements

Abstract

The liquid crystal display device has a rear frame, a reflection sheet, a backlight, a pair of light frames, a liquid crystal panel, a bezel. The device further includes a cell guide for fixing the liquid crystal panel. In the cell guide, engagement portions are formed, and engaged with corresponding locking portions formed in the pair of light frames.

Claims

1. A liquid crystal display device, comprising:

a rear frame formed by cutting and bending a metal plate, the rear frame including a rectangular bottom portion, a pair of connecting portions extending from two longer sides of the bottom portion slantwise upward with respect to the bottom portion, and a pair of support portions bent from the respective connecting portions outwardly in parallel with the bottom portion;

a pair of light frames for retaining a backlight on its lower side;

a rectangular diffusion plate for diffusing light disposed on the pair of light frames and the pair of support portions;

a rectangular diffusion sheet superposed on the diffusion plate;

a cell guide of a rectangular frame-like form for holding down outer peripheral portions of the diffusion plate and diffusion sheet;

a liquid crystal cell, disposed on an upper portion of the cell guide and having a pair of opposing glass substrates with liquid crystal filled in a space therebetween; and

a bezel of a rectangular frame-like form for holding down the cell guide and liquid crystal cell, characterized in that

the cell guide has longer side portions, shorter side portions, an engagement portion provided vertically downward extending from an outer edge of each shorter side portion on a lower face side of the cell guide, and having a pouch-like portion open to an inside of the cell guide, and a reentrant portion formed in each shorter side portion on the lower face side,

each of the paired light frames has bosses protruding from an upper face thereof, and locking portions each having a locking nail protruding to an outer face side when the pair of light frames is attached to the rear frame, and formed so as to be elastically deformable,

and

the cell guide is positioned by fitting the bosses of the pair of light frames in the reentrant portions, and engaging the engagement portions with the corresponding locking nails of the pair of light frames, and is fastened to the rear frame or the pair of light frames by bolts together with the bezel.

2. The liquid crystal display device of claim 1, characterized in that the cell guide is composed of four L-shaped members adjoined to one another, and

each L-shaped member has a long portion forming a part of the longer side portion, and a short portion forming a part of the shorter side portion, in which the long and short portions are formed so as to intersect at right angles.

3. The liquid crystal display device of claim 1, characterized in that at least one of the locking portions is formed for each of the paired light frames respectively arranged for two shorter sides of the rear frame, and

at least one of the engagement portions is formed for each of the shorter side portions of the cell guide.

4. The liquid crystal display device of claim 2, characterized in that at least two of the locking portions are formed for each of the paired light frames respectively arranged for two shorter sides of the rear frame, and

at least one of the engagement portions is formed for the short portion of each L-shaped member.

5. A liquid crystal display device, comprising:

a rear frame formed by cutting and bending a metal plate, the rear frame including a rectangular bottom portion, a pair of connecting portions extending from two longer sides of the bottom portion slantwise upward with respect to the bottom portion, and a pair of support portions bent from the respective connecting portions outwardly in parallel with the bottom portion;

a reflection sheet disposed in close contact with the bottom portion and the pair of connecting portions of the rear frame;

a backlight having a set of U-shaped cathode tubes disposed above the reflection sheet;

a pair of light frames disposed above the backlight for retaining the backlight;

a rectangular diffusion plate for diffusing light disposed on the pair of light frames and the pair of support portions;

a pair of rectangular diffusion sheets superposed on the diffusion plate, one of the paired rectangular diffusion sheets stacked on the other;

a cell guide of a rectangular frame-like form for holding down outer peripheral portions of the diffusion plate and the pair of diffusion sheets;

a liquid crystal cell, disposed on an upper portion of the cell guide and having a pair of opposing glass substrates with liquid crystal filled in a space therebetween; and

a bezel of a rectangular frame-like form for holding down the cell guide and liquid crystal cell, characterized in that

the cell guide is divided into four L-shaped members,

each of the L-shaped members has a long portion forming a longer side, a short portion adjoining the long portion at a right angle and forming a shorter side, an engagement portion provided vertically downward extending from an outer edge of the short portion on a lower face side of the cell guide, and having a pouch-like portion open to an inside of the cell guide, and a reentrant portion formed on a lower face side of the short portion,

each of the paired light frames has bosses protruding from an upper face thereof, reentrant grooves formed on an outer face side of the light frame and extending in an up-and-down direction of the light frame, and a locking portion formed inside each reentrant groove,

the locking portion has an adjoining piece integrally formed with and protruded from the light frame, an elastic locking piece provided upright on an upper face side of the adjoining piece, and a locking nail provided and protruded outwardly from an end portion of the elastic locking piece, and

the cell guide is positioned by fitting the bosses of the pair of light frames in the reentrant portions, and engaging the engagement portions with the corresponding locking nails of the pair of light frames, and is fastened to the rear frame or the pair of light frames by bolts together with the bezel.