Liquid crystal display device having a removable holding member for the light source

• US 5,654,779 A
• Filed: 12/29/1994
• Issued: 08/05/1997
• Est. Priority Date: 05/18/1994
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.), Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Tobita, Toshio, Takaki, Takanori, Takahashi, Seiki, Nakayama, Tatsuya
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Malinowski, Walter J.
• Application Number:
  US08/365,791
• Time in Patent Office: 950 Days
• Field of Search: 362/26, 362/27, 362/31, 362/32, 359/40, 359/41, 359/42, 359/48, 359/50, 359/49, 359/69, 359/70, 359/83, 385/146, 385/901, 345/905, 349/58, 349/61, 349/62, 349/64, 349/65, 349/70, 349/113
• US Class Current: 349/58
• CPC Class Codes: F21S 8/00 Lighting devices intended for fixed installation F21S9/00, F21S10/00 take precedence; using a string or strip of light sources F21S4/00
• CPC Class Codes: F21Y 2103/00 Elongate light sources, e.g. fluorescent tubes
• CPC Class Codes: G02B 6/0001 specially adapted for lighting devices or systems lighting or signalling on vehicles using light guides B60Q1/00; lighting devices for vehicle dashboards B60Q3/10; lighting devices for vehicle interior using light guides B60Q3/62; lighting devices mounted on the vehicle rear part using light guides F21S43/235; measuring arrangements having light conducting pointers G01D13/265; illumination of liquid crystal displays G02F1/1336; illuminated signs G09F13/00
• CPC Class Codes: G02F 1/1336 Illuminating devices
• CPC Class Codes: G02F 2203/68 Green display, e.g. recycling, reduction of harmful substances
• CPC Class Codes: Y10S 345/905 Display device with housing structure
• CPC Class Codes: Y10S 385/901 Illuminating or display apparatus

Abstract

A liquid crystal display device adaptable for various applications is provided which comprises a liquid crystal display panel, lamps, lamp holders respectively holding the lamps, a photoconductive board provided between the lamps, and a frame covering both the lamps and the lamp holders, wherein the photoconductive board comprises an outer photoconductive part fixed to the lamp holders, and an inner photoconductive part held on the rear side thereof by a holding member provided to the frame.

Claims

1. A liquid crystal display device comprising:

a liquid crystal display panel;

lamps;

lamp holders holding respective lamps;

a light guiding board positioned between the lamps; and

a frame supporting the lamp holders, wherein the light guiding board comprises an outer light guiding part fixed to the lamp holders, and an inner light guiding part removably fitting into and securable within the outer light guiding part with a holding member removably mounted to the frame.

2. The liquid crystal display device according to claim 1 comprising:

a diffusing plate disposed on a first side of the inner light guiding part for diffusing light passing through the inner light guiding part;

a light scattering part disposed on a second side of the inner light guiding part for directing light from the lamps toward the liquid crystal display panel; and

a reflector sheet disposed on the second side of the inner light guiding part for reflecting light from the lamps toward the liquid crystal display panel in a pattern.

3. The liquid crystal display device according to claim 1 wherein the holding member comprises a leaf spring.

4. The liquid crystal display device according to claim 1 wherein the holding member comprises a plate spring.

5. A liquid crystal display device comprising:

a liquid crystal display panel;

lamps;

lamp holders holding respective lamps;

a light guiding board positioned between the lamps; and

a frame supporting the lamps and the lamp holders, wherein the light guiding board comprises an outer light guiding part fixed to the lamp holders, and an inner light guiding part removably fitted into and securable within the outer light guiding part with a holding member removably mounted to the frame, the light guiding board having first and second surfaces and first and second edges, the first surface being convex or concave.

6. The liquid crystal display device according to claim 5 wherein the first surface is convex.

7. The liquid crystal display device according to claim 5 wherein the first surface is concave.

8. The liquid crystal display device according to claim 5 comprising:

a diffusing plate disposed on a first side of the inner light guiding part for diffusing light passing through the inner light guiding part;

a light scattering part disposed on a second side of the inner light guiding part for directing light from the lamps toward the liquid crystal display panel; and

a reflector sheet disposed on the second side of the inner light guiding part for reflecting light from the lamps toward the liquid crystal display panel in a pattern.

9. A liquid crystal display device comprising:

a liquid crystal display panel;

lamps;

lamp holders holding respective lamps;

a light guiding board positioned between the lamps, the light guiding board having first and second edges;

a frame holding the lamp holders, wherein the frame comprises a front frame part covering a front side of the lamps and lamp holders, and a rear frame part supporting a rear side of the lamp holders and the light guiding board with a removable holding member, the rear frame part being disposed outside the first and second edges of the light guiding board and having an end edge closest to the first and second edges of the light guiding board that is outwardly spaced apart from the light guiding board; and

a reinforcing frame positioned between the lamp holders.

10. The liquid crystal display device according to claim 9 comprising:

a diffusing plate disposed on a first side of the light guiding board for diffusing light passing through the light guiding board;

a light scattering part disposed on a second side of the light guiding board for directing light from the lamps toward the liquid crystal display panel; and

a reflector sheet disposed on the second side of the light guiding board for reflecting light from the lamps toward the liquid crystal display panel in a pattern.

11. A liquid crystal display device comprising:

a liquid crystal display panel;

a frame holding the liquid crystal display panel;

a light guiding board positioned in the frame with a removable holding member mounted to the frame for guiding light introduced into the light guiding board;

at least one lamp disposed within the light guiding board for producing light introduced into the light guiding board;

a diffusing plate disposed on a first side of the light guiding board for diffusing light passing through the light guiding board;

a light scattering part disposed on a second side of the light guiding board for directing light from the lamp toward the liquid crystal display panel; and

a reflector sheet disposed on the second side of the light guiding board for reflecting light from the lamp toward the liquid crystal display panel in a pattern.