Liquid crystal display apparatus

• US 20070030242A1
• Filed: 07/25/2006
• Published: 02/08/2007
• Est. Priority Date: 08/02/2005
• Status: Active Grant

• Current Assignee: Ned Lcd Technologies, Ltd.
• Original Assignee: NEC LCD Technologies Limited (Tianma Microelectronics Company Limited)
• Inventors: Ito, Yukihiro
• Granted Patent: US 8,810,521 B2
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0081 Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/046 by electromagnetic means

Abstract

A plurality of LEDS used for a light source are mounted on the surface of an electromagnetic-induction touch panel in which coiled wiring is formed on a glass epoxy substrate. A dual-use touch-panel/backlight I/F FPC substrate is connected to the touch panel in order to feed power to the LEDs and to feed power and signals to the touch panel. A shield plate 7 is disposed on the reverse side of the touch panel, and a backlight light guide plate and a liquid crystal panel are disposed in the stated order on the side on which the LEDs are mounted. A liquid crystal panel I/F FPC substrate for feeding power to the liquid crystal panel is connected to the liquid crystal panel.

Claims

1. A liquid crystal display apparatus, comprising:

a liquid crystal panel,

a backlight light guide plate which is disposed behind said liquid crystal panel and which supplies light to the liquid crystal panel,

an electromagnetic-induction touch panel disposed behind said light guide plate, and

one or a plurality of backlight light sources fixed to said touch panel and used to feed light to said light guide plate.

2. The liquid crystal display apparatus according to claim 1, wherein

a plurality of said light sources are disposed on said touch panel along the side edges of said light guide plate;

and

light emitted from said light source enters said light guide plate from the side surface of the light source that faces said light guide plate.

3. The liquid crystal display apparatus according to claim 1, wherein an electromagnetic noise shield plate is disposed behind said touch panel.

4. The liquid crystal display apparatus according to claim 2, wherein an electromagnetic noise shield plate is disposed behind said touch panel.

5. The liquid crystal display apparatus according to claim 1, wherein said light source is a light-emitting diode.

6. The liquid crystal display apparatus according to claim 2, wherein said light source is a light-emitting diode.

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

a touch-panel wiring cable for feeding power and signals to said touch panel; and

a light-source wiring cable for feeding power to said light source.

8. The liquid crystal display apparatus according to claim 2, further comprising:

a touch-panel wiring cable for feeding power and signals to said touch panel; and

a light-source wiring cable for feeding power to said light source.

9. The liquid crystal display apparatus according to claim 1, wherein

said light source is connected to the wiring substrate of said touch panel, and

a wiring cable for feeding power and signals to said touch panel and feeding power to said light source is connected to said wiring substrate.

10. The liquid crystal display apparatus according to claim 2, wherein

said light source is connected to the wiring substrate of said touch panel, and

a wiring cable for feeding power and signals to said touch panel and feeding power to said light source is connected to said wiring substrate.

11. The liquid crystal display apparatus according to claim 7, wherein said wiring cable is a flexible printed substrate.

12. The liquid crystal display apparatus according to claim 8, wherein said wiring cable is a flexible printed substrate.

13. The liquid crystal display apparatus according to claim 9, wherein said wiring cable is a flexible printed substrate.

14. The liquid crystal display apparatus according to claim 10, wherein said wiring cable is a flexible printed substrate.

15. The liquid crystal display apparatus according to claim 1, wherein the apparatus is mounted in a mobile information terminal apparatus or a tablet personal computer.

16. The liquid crystal display apparatus according to claim 2, wherein the apparatus is mounted in a mobile information terminal apparatus or a tablet personal computer.