Liquid crystal module with tab assemblies connected through a flexible circuit board

• US 5,341,233 A
• Filed: 01/13/1993
• Issued: 08/23/1994
• Est. Priority Date: 05/15/1991
• Status: Expired due to Fees

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Idemitsu Kosan Company Limited
• Inventors: Kurosawa, Moriyoshi, Tomoike, Kazuhiro
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Parker, Kenneth
• Application Number:
  US07/972,478
• Time in Patent Office: 587 Days
• Field of Search: 359/84, 359/87, 359/88, 359/83, 359/70, 361/767, 361/749, 361/776, 361/398, 361/403, 361/418, 361/412
• US Class Current: 349/150
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels
• CPC Class Codes: H01L 23/4985 Flexible insulating substrates H01L23/49572 and H01L23/49855 take precedence
• CPC Class Codes: H01L 23/5387 Flexible insulating substrates H01L23/5388 takes precedence
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits

Abstract

A matrix liquid crystal unit having a liquid crystal panel composed of two flexible plastic substrates and a liquid crystal material sandwiched between the flexible plastic substrates, and a flexible circuit sheet with a plurality of liquid crystal driver TAB·LSI assemblies mounted thereon are electrically connected to each other, making up a liquid crystal unit. Each of the flexible plastic substrates has a group of liquid crystal driver electrodes. Each of the liquid crystal driver TAB·LSI assemblies has a group of output terminals connected respectively to the liquid crystal driver electrodes through connection lines on the flexible circuit sheet. A connector connected to electrode terminals on the flexible circuit sheet, an interface connector to be connected to electrode terminals of an external control device, and printed wires for electrically connecting the connectors to each other, jointly make up a thin board. A liquid crystal module is composed of the liquid crystal unit and the thin board which are superimposed one on the other.

Claims

1. A liquid crystal module comprising:

a matrix liquid crystal unit including a liquid crystal panel composed of two flexible plastic substrates and a liquid crystal material sandwiched between the flexible plastic substrates, said liquid crystal panel having liquid crystal drive electrodes and first terminals for the liquid crystal drive electrodes at a side portion thereof, and a flexible circuit sheet having a plurality of liquid crystal drive TAB·

LSI assemblies mounted thereon and second and third terminals for the liquid crystal drive TAB·

LSI assemblies at side portions thereof, said liquid crystal panel and said flexible circuit sheet being piled and lightly connected together, and the first and second terminals being electrically connected to each other at the side portions; and

a thin board having a circuit thereon and a lock connector at a side portion, said thin board being disposed over the flexible circuit sheet and lightly connected thereto, said lock connector being fixed to the third terminals for electrically connecting said circuit of the thin board to the liquid crystal drive TAB·

LSI of the flexible circuit sheet so that the liquid crystal module is made flexible.

2. A liquid crystal module according to claim 1, wherein said thin board doubles as a reinforcing plate for said matrix liquid crystal unit.

3. A liquid crystal module according to claim 1, wherein said liquid crystal material consists of a composition that comprises a ferroelectric liquid crystalline polymer.

4. A liquid crystal module according to claim 1, wherein said flexible circuit sheet with the liquid crystal driver TAB·

LSI assemblies mounted thereon is disposed on a back side of said liquid crystal panel.

5. A liquid crystal module according to claim 1, further comprising resilient adhesive materials situated between said liquid crystal panel and said flexible circuit sheet, and between said flexible circuit sheet and said thin board to connect these members together.

6. A liquid crystal module comprising at least a liquid crystal panel having two flexible plastic substrates and a liquid crystal material sandwiched between the flexible plastic substrates, at least one of said flexible plastic substrates having a group of liquid crystal driver electrodes thereon and first terminals for the liquid crystal driver electrodes at a side portion thereof,

a plurality of liquid crystal driver TAB·

LSI assemblies, each having output terminals, and

a flexible circuit sheet piled over the liquid crystal panel and lightly connected thereto, said flexible circuit sheet having printed wires formed thereon to which said liquid crystal driver TAB·

LSI assemblies are fixed, and second terminals located at ends of the printed wires at a side portion of the flexible circuit sheet, said first and second terminals being directly connected together at the side portions to connect said liquid crystal driver TAB·

LSI assemblies to said liquid crystal driver electrodes through said connection lines on said flexible circuit sheet so that the liquid crystal module is made flexible.

7. A liquid crystal module according to claim 6, further including a polarizing filter disposed on at least one of said two flexible plastic substrates, and a reflector disposed on a non-display side of said liquid crystal panel, wherein each of said flexible plastic substrates have a thickness of 0.3 mm or less, said polarizing filter has a thickness of 0.2 mm or less, said reflector has a thickness of 0.2 mm or less, and said flexible circuit sheet has a thickness of 0.1 mm or less.

8. A liquid crystal module according to claim 6, wherein each of said liquid crystal drive TAB·

LSI assemblies has a group of input terminals to be connected to a control circuit for controlling the liquid crystal driver TAB·

LSI assemblies.

9. A liquid crystal module according to claim 6, wherein said liquid crystal driver TAB·

LSI assemblies are disposed on a back side of said liquid crystal panel.

10. A liquid crystal module according to claim 6, further comprising a resilient adhesive material situated between said liquid crystal panel and said flexible circuit sheet to connect these members together.