Liquid crystal display device having light guiding plate disposed between circuit board and display panel

• US 5,694,190 A
• Filed: 11/28/1995
• Issued: 12/02/1997
• Est. Priority Date: 12/13/1994
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Matsumoto, Takumi, Ukai, Kenichi
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Duong, Tai V.
• Application Number:
  US08/563,791
• Time in Patent Office: 735 Days
• Field of Search: 359/87, 359/88, 359/83, 359/48, 359/50, 361/681, 361/785, 439/59, 439/62, 439/64, 439/69, 439/74, 439/79, 174/59, 174/260, 362/26, 362/31, 349/65, 349/149, 349/151, 349/152, 349/58
• US Class Current: 349/151
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels

Abstract

A signal input electrode portion formed on a liquid crystal display panel which has driver LSIs outputting signals for driving picture elements is detachably inserted from a side direction thereof into and is connected to a connector mounted on a circuit board for supplying electric power and input signals to the liquid crystal display panel. The liquid crystal display panel is electrically connected with the circuit board through the connector.

Claims

1. A liquid crystal display device, comprising:

a liquid crystal display panel having a circuit outputting signals for driving picture elements;

a circuit board for supplying electric power and input signals to said liquid crystal display panel;

a signal input electrode portion formed on said liquid crystal display panel, said signal input electrode portion receiving the electric power and the input signals supplied from said circuit board;

a connector mounted on said circuit board, wherein said signal input electrode portion is detachably inserted into and connected to said connector so as to electrically connect said circuit board with said liquid crystal display panel;

a back-light guiding plate disposed between said circuit board and said liquid crystal display panel for emitting light from the whole surface thereof, said liquid crystal display panel being connected to said circuit board through said connector, said back-light guiding panel having a taper gradually reducing in thickness toward said connector;

said connector comprising a conductive contact coming into pressure contact with said signal input electrode portion when said liquid crystal display panel is connected with said circuit board; and

a supporting member formed of a mold material for supporting said conductive contact.

2. A liquid crystal display device, comprising:

a liquid crystal display panel having a circuit outputting signals for driving picture elements;

a circuit board for supplying electric power and input signals to said liquid crystal display panel;

a signal input electrode portion formed on said liquid crystal display panel, said signal input electrode portion receiving the electric power and the input signals supplied from said circuit board;

a connector mounted on said circuit board, wherein said signal input electrode portion and said connector are detachably inserted and slidably connected to one another so as to electrically connect said circuit board with said liquid crystal display panel; and

a back-light guiding plate disposed between said circuit board and said liquid crystal display panel for emitting light from the whole surface thereof, said liquid crystal display panel being connected to said circuit board through said connector, said back-light guiding plate having a taper gradually reducing in thickness toward said connector, said liquid crystal display panel, said circuit board and said back-light guiding plate being disposed in generally parallel relation relative to one another, with at least portions lying in generally parallel overlapping relation to one another.

3. A liquid crystal display device according to claim 2 wherein said liquid crystal display panel and said circuit board are in spaced overlying relation to one another when the signal input electrode portion is inserted into and connected to said connector, said tapered back-light guiding plate having an end of reduced thickness disposed between said liquid crystal display panel and said circuit board.

4. A liquid crystal display device, comprising:

a liquid crystal display panel having a circuit outputting signals for driving picture elements;

a circuit board for supplying electric power and input signals to said liquid crystal display panel;

a signal input electrode portion formed on said liquid crystal display panel, said signal input electrode portion receiving the electric power and the input signals supplied from said circuit board;

a connector mounted on said circuit board, wherein said signal input electrode portion is detachably inserted into and connected to said connector so as to electrically connect said circuit board with said liquid crystal display panel;

a back-light guiding plate disposed between said circuit board and said liquid crystal display panel for emitting light from the whole surface thereof, said liquid crystal display panel being connected to said circuit board through said connector, said back-light guiding panel having a taper gradually reducing in thickness toward said connector;

a backside casing having board inserting grooves enabling insertion of said circuit board therein and placement of said back-light guiding plate therein; and

a front-side casing attached to said backside casing so as to cover both said liquid crystal display panel and said circuit board, wherein said liquid crystal display panel is placed on said back-light guiding plate and said circuit board is connected to said liquid crystal display panel through said connector by inserting said circuit board into said backside casing along said board inserting grooves formed on said backside casing.

5. A liquid crystal display device according to claim 4, wherein said connector comprises:

a conductive contact coming into pressure contact with said signal input electrode portion when said liquid crystal display panel is connected with said circuit board; and

a supporting member made of a mold material for supporting said conductive contact.

6. A liquid crystal display device according to claim 4, wherein said backside casing facing the back-light guiding plate comprises a light-reflective material.