Liquid crystal display apparatus

• US 8,810,521 B2
• Filed: 07/25/2006
• Issued: 08/19/2014
• Est. Priority Date: 08/02/2005
• Status: Active Grant

• Current Assignee: NLT Technologies, Ltd. (Tianma Microelectronics Company Limited)
• Original Assignee: NLT Technologies, Ltd. (Tianma Microelectronics Company Limited)
• Inventors: Ito, Yukihiro
• Primary Examiner(s): Boddie, William
• Assistant Examiner(s): Shapiro, Leonid
• Application Number:
  US11/492,049
• Publication Number:
  US 20070030242A1
• Time in Patent Office: 2,947 Days
• Field of Search: 345/173, 345/102, 345/55, 345/87
• US Class Current: 345/173
• 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 backlight light guide plate;

an electromagnetic noise shield plate disposed behind said electromagnetic-induction touch panel; and

a plurality of backlight light sources which is fixed to said electromagnetic-induction touch panel along side edges of said backlight light guide plate and is used to feed light to said backlight light guide plate,

wherein light emitted from said plurality of backlight light sources enters said backlight light guide plate from a side surface of said backlight light guide plate that faces said plurality of backlight light sources.

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

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

a light-source wiring cable for feeding power to said plurality of backlight light sources.

3. The liquid crystal display apparatus according to claim 2, wherein said touch-panel wiring cable is a flexible printed substrate.

4. The liquid crystal display apparatus according to claim 1, wherein said plurality of backlight light sources is connected to the wiring substrate of said electromagnetic-induction touch panel, and a wiring cable for feeding power and signals to said electromagnetic-induction touch panel and feeding power to said plurality of backlight light sources is connected to said wiring substrate.

5. The liquid crystal display apparatus according to claim 4, wherein said wiring cable is a flexible printed substrate.

6. 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.