Liquid crystal display device with reduced frame portion surrounding display area

• US 5,739,887 A
• Filed: 10/13/1995
• Issued: 04/14/1998
• Est. Priority Date: 10/21/1994
• Status: Expired due to Term

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation), Device Engineering Co., Ltd. (Torex Semiconductor Ltd.)
• Original Assignee: Hitachi Device Engineering Co., Ltd., Hitachi, Ltd.
• Inventors: Kumaoka, Shunichi, Kobayashi, Naoto, Ueda, Shiro, Igarashi, Yoichi, Sasuga, Masumi, Shibata, Katsuhiko
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Dudek, James A.
• Application Number:
  US08/542,962
• Time in Patent Office: 914 Days
• Field of Search: 349/149, 349/150, 349/151, 349/190, 349/152, 349/189, 349/154, 349/153, 345/204
• US Class Current: 349/149
• CPC Class Codes: G02F 1/133604 with lamps
• CPC Class Codes: G02F 1/133612 Electrical details
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels
• CPC Class Codes: H01L 2224/73204 the bump connector being embedded into the layer connector
• CPC Class Codes: H05K 1/141 One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters H05K1/142 and H05K1/147 take precedence
• CPC Class Codes: H05K 2201/056 Folded around rigid support or component
• CPC Class Codes: H05K 3/323 by applying an anisotropic conductive adhesive layer over an array of pads
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits
• CPC Class Codes: H05K 3/4691 Rigid-flexible multilayer circuits comprising rigid and flexible layers, e.g. having in the bending regions only flexible layers

Abstract

A liquid crystal display device. The liquid crystal display device has a peripheral circuit including a liquid crystal display having drive ICs COG-packaged on a transparent substrate, and a foldable multi-layered flexible substrate having two or more conductor layers, so that the compact packaging can be realized to reduce EMI noise and the number of parts. The liquid crystal display device may also include a display controller having two or more display control integrated circuit elements packaged therein, and drive ICs mounted by a chip-on-glass packaging on two sides of a liquid crystal display panel, usually, on the longer sides, so that the display controller excellent in the temperature resistance and advantageous in compact and a video signal line driving circuit board are uniformly arranged at the upper and lower sides of a screen. As a result, the vertical positioning of the screen can be made proper to take an advantage in the compact packaging. Further, the liquid crystal display device may have a peripheral circuit board positioned in an outer periphery of a seal port recessed to avoid the projection of the seal port and in which a fluorescent tube has its two lamp cables arranged around four sides of a liquid crystal display element, so that the substrate at the seal port side and the lamp cable of a side light type back light can be compactly packaged.

Claims

1. A liquid crystal display device comprising:

drive ICs mounted on one of two superposed insulating substrates, wherein at least one of the substrates is transparent; and

at least one multi-layered flexible substrate is arranged in an outer periphery of at least one side of the at least one of the substrates and having a pattern portion of three or more conductor layers;

wherein a pattern portion made of either one conductor layer or two conductor layers of the at least one multi-layered flexible substrate is electrically connected with an input terminal pattern of the drive ICs, which is formed on and in a direction substantially normal to the at least one side of the at least one of the substrates;

wherein an anisotropic conductive film is used both for mounting the drive ICs on the at least one of the substrates, and for connecting the pattern portion made of either one conductor layer or two conductor layers of the at least one multi-layered flexible substrate with the input terminal pattern; and

wherein the at least one multi-layered flexible substrate is folded by approximately 180 degrees at a foldable portion having one conductor layer or two conductor layers.

4. A liquid crystal display device according to claim 1, 2 or 3, wherein at least one of the multi-layered flexible substrates has its pattern portion made of a single conductor which is electrically connected with the input terminal pattern of said drive ICs through an anisotropic conductive film, and is folded by approximately 180 degrees.

5. A liquid crystal display device according to claim 1, 2 or 3, further comprising a multi-layered rigid printed board having wiring lines for a display control circuit and a power supply circuit.

6. A liquid crystal display device according to claim 1, 2 or 3, wherein the pattern portion of three or more conductor layers of said multi-layered flexible substrate is adhered to the back of one substrate.

7. A liquid crystal display device according to claim 1, 2 or 3, wherein electronic parts are mounted on one side of the portion of said multi-layered flexible substrate, which has three or more conductor layers.

8. A liquid crystal display device according to claim 7, wherein electronic parts mounted only one side at the portion of said multi-layered flexible substrate, which has two or more conductor layers, are positioned in an opening of a shield casing.

9. A liquid crystal display device according to claim 1, 2 or 3, wherein electronic parts are mounted only on a surface of an uppermost conductor layer side of the portion of three or more conductor layers of said folded multi-layered flexible substrate, and wherein a surface of a lowermost conductor layer is adhered to the back of the at least one of the substrates.

10. A liquid crystal display device according to claim 1, 2 or 3, wherein said portion of one conductor layer or two conductor layers is projected separately to the individual drive ICs.

11. A liquid crystal display device according to claim 10, wherein said projected portion is formed therein with marks for alignment with said input terminal pattern.

12. A liquid crystal display device according to claim 1, 2 or 3, wherein said at least one multi-layered flexible substrate includes a conductor layer having a solid or mesh-shaped pattern portion fixed at a DC power supply voltage or at the ground in the portion of three or more conductor layers of said folded at least one multi-layered flexible substrate.

13. A liquid crystal display device according to claim 12, wherein said solid or mesh-shaped portion of said at least one multi-layered flexible substrate, and a solid or mesh-shaped pattern portion of a multi-layered wiring substrate for a display data controller and a power supply unit are fixed at the ground connected electrically with the ground pads of a common metallic shield casing.

15. A liquid crystal display device according to claim 5, wherein the multi-layered flexible substrate of a peripheral driver and the multi-layered for the display controller and the power supply unit are electrically connected through an anisotropic conductive film.

2. A liquid crystal display device comprising:

drive ICs mounted on one of two superposed insulating substrates, wherein at least one of the substrates is transparent; and

multi-layered flexible substrates are arranged in an outer periphery of two adjacent sides of four sides of the at least one of the substrates and at least one of the multi-layered flexible substrates has a pattern portion of three or more conductor layers;

wherein a pattern portion made of either one conductor layer or two conductor layers of each of the multi-layered flexible substrates is electrically connected with an input terminal pattern of the drive ICs, which is formed on and in a direction substantially normal to at least one side of the at least one of the substrates;

wherein an anisotropic conductive film is used both for mounting the drive ICs on the at least one of the substrates, and for connecting the pattern portion made of either one conductor layer or two conductor layers of the at the at least one of the multi-layered flexible substrates with the input terminal pattern; and

wherein at least one of the multi-layered flexible substrates is folded by approximately 180 degrees at a foldable portion having one conductor layer or two conductor layers.

14. A liquid crystal display device according to claim 2 or 3, wherein a plurality of multi-layered flexible substrates or peripheral drivers have their wiring lines electrically connected with each other through a metallic wiring pattern on said substrate.

3. A liquid crystal display device comprising:

drive ICs mounted on one of two superposed transparent insulating substrates, wherein at least one of the substrates is transparent; and

multi-layered flexible substrates arranged in an outer periphery of two opposed longer sides and one shorter side of four sides of the at least one of the substrates and at least one of the multi-layered flexible substrates having a pattern portion of three or more conductor layers,

wherein a pattern portion made of either one conductor layer or two conductor layers of each of the multi-layered flexible substrates is electrically connected with an input terminal pattern of the drive ICs, which is formed on and in a direction substantially normal to aside of the at least one of the substrates;

wherein an anisotropic conductive film is used both for mounting the drive ICs on the at least one of the substrates, and for connecting the pattern portion made of either one conductor layer or two conductor layers of each of the multi-layered flexible substrates with the input terminal pattern; and

wherein at least one of the multi-layered flexible substrates is folded by approximately 180 degrees at a foldable portion having one conductor layer or two conductor layers.

16. A liquid crystal display device comprising:

drive ICs mounted on one of two superposed insulating substrates, wherein at least one of the substrates is transparent, and at least one multi-layered flexible substrate is arranged in an outer periphery of at least one side of the at least one of the substrates and having a pattern portion of three or more conductor layers,

wherein a pattern portion made of either one conductor layer or two conductor layers of the at least one multi-layered flexible substrate is electrically connected with an input terminal pattern of the drive ICs, which is formed on and in a direction substantially normal to the at least one side of the at least one substrate,

wherein an anisotropic conductive film is used for connecting the pattern portion made of either one or two conductor layers of the at least one multi-layered flexible substrate with the input terminal pattern, and

wherein the at least one multi-layered flexible substrate is folded at a foldable portion having one conductor layer or two conductor layers.

17. A liquid crystal display device comprising:

drive ICs mounted on one of two superposed insulating substrates, wherein at least one of the substrates is transparent, and at least one multi-layered flexible substrate is arranged in an outer periphery of at least one side of the at least one of the substrates and having a pattern portion of three or more conductor layers,

wherein a pattern portion made of either one conductor layer or two conductor layers of the at least one multi-layered flexible substrate is electrically connected with an input terminal pattern of the drive ICs, which is formed on and in a direction substantially normal to the at least one side of the at least one substrate,

wherein an anisotropic conductive film is used both for mounting the drive ICs on the at least one side of the substrate, and for connecting the pattern portion made of either one or two conductor layers of the at least one multi-layered flexible substrate with the input terminal pattern, and

wherein the at least one multi-layered flexible substrate is folded at a foldable portion having one conductor layer or two conductor layers in the form that the edge of the pattern portion of three or more conductor layers is positioned inside the at least one of the substrates in a plane view.