Led backlight

• US 20020175632A1
• Filed: 05/22/2002
• Published: 11/28/2002
• Est. Priority Date: 05/22/2001
• Status: Abandoned Application

• Current Assignee: Yazaki Corporation
• Original Assignee: Yazaki Corporation
• Inventors: Takeguchi, Toshitaka
• Application Number:
  US10/152,331
• Publication Number:
  US 20020175632A1
• Time in Patent Office: Days
• US Class Current: 315/169.1
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 5/026 Control of mixing and/or overlay of colours in general G09G5/022 and G09G5/024 take precedence

Abstract

A flat rectangular light guide plate (3) is placed on the side of the rear face of a flat rectangular LCD (1), and four kinds of LEDs having different luminous colors (a red LED (5a), a blue LED (5b), a green LED (5c), and a white LED (5d) are placed on the four side faces of the light guide plate (3) in a one to one relationship between the four kinds of LEDs and the four side faces.

Claims

1. An LED backlight comprising:

a flat liquid crystal display element;

a flat light guide plate disposed on a rear face side of the liquid crystal display element; and

four kinds of LEDs having different luminous colors which are disposed on four side faces of the light guide plate, respectively.

2. The LED backlight according to claim 1, wherein the four kinds of LEDs are a red LED, a green LED, a blue LED, and a white LED.

3. The LED backlight according to claim 2 further comprising an LED controller which controls lighting times of the red LED, the green LED, the blue LED, and the white LED.

4. The LED backlight according to claim 1, wherein a plurality of grooves are formed in the side faces, respectively, the LEDs are fitted into the respective grooves, and the LEDs are attached to a wiring board to which the LEDs are electrically connected.

5. An LED backlight comprising:

a flat liquid crystal display element;

a flat light guide plate disposed on a rear face side of the flat liquid crystal display element; and

four kinds of LEDs having different luminous colors which are disposed on at least one of four side faces of the light guide plate.

6. The LED backlight according to claim 5, wherein the four kinds of LEDs are a red LED, a green LED, a blue LED, and a white LED.

7. The LED backlight according to claim 6 further comprising an LED controller which controls lighting times of the red LED, the green LED, the blue LED, and the white LED.

8. The LED backlight according to claim 5, wherein a plurality of grooves are formed in the side faces, respectively, the LEDs are fitted into the respective grooves, and the LEDs are attached to a wiring board to which the LEDs are electrically connected.

9. An LED backlight comprising:

a flat liquid crystal display element;

a flat light guide plate disposed on a rear face side of the liquid crystal display element; and

a plurality of LED packages mounted on at least one of four side faces of the light guide plate, wherein three kinds of LEDs having different luminous colors which are integrated with each other are installed in each LED package.

10. The LED backlight according to claim 9, wherein the three kinds of LEDs are a red LED, a green LED, and a blue LED, one of the plurality of LED package can emit white light, and another LED package emits light of a color other than white.

11. The LED backlight according to claim 10 further comprising an LED controller which controls lighting times of the red LED, the green LED, and the blue LED.

12. The LED backlight according to claim 9, wherein a plurality of grooves are formed in the side faces, the plurality of LED packages are fitted into the grooves, respectively, and the plurality of LED packages are attached to a wiring board to which the LEDs are electrically connected.