Liquid-crystal display device and process for producing the same

Claim 2

A liquid-crystal display device according to claim 1 wherein said lead wires have input lead wires and output lead wires, further characterized in that the flexible film (3) having lead wires (3a) formed on the reverse side is such that the associated output lead wires are connected to the electrodes on whichever of the first and second panels (1b) that have those electrodes formed on the side facing said reverse side whereas the associated input lead wires are connected to said input circuit boards, and that the flexible film (8) having lead wires (8a) formed on the obverse side is such that the associated output lead wires are connected to the electrodes on whichever of the first and second panels (1a) that have those electrodes formed on the side opposite to said obverse side whereas the associated input lead wires are connected to said input circuit boards.

Claim 3

A liquid-crystal display device according to claim 2 wherein each of said flexible films (3, 8) has an opening (12, 13, 14, 15) in which part of said input lead wires are disposed.

Claim 4

In a liquid-crystal display device comprising a liquid-crystal display panel (1) that has a first panel (1b) having a plurality of electrodes arranged in a vertical direction and partly exposed at an end and a second panel (1a) having a plurality of electrodes arranged in a horizontal direction and partly exposed at an end, said panels (1a, 1b) being superposed in such a way that the sides where said electrodes are provided face inwardly, a first circuit board that is connected to said electrodes on the first panel (1b) and that receives a display signal from the outside, and a second circuit board that is connected to said electrodes on the second panel (1a) and that also receives a display signal from the outside, the improvement wherein each of said first and second circuit boards has an input circuit board (2, 7) for receiving external signals and a flexible film (3, 8) that is disposed on said input circuit board (2, 7) and that carries an IC (4, 9) for receiving signals from said input circuit board (2, 7), each of said flexible films (3, 8) having formed thereon a plurality of input and output lead wires connected to the terminals of said IC (4, 9), as well as an opening in which part of said input lead wires are disposed, whereas the plurality of lead wires on one of said flexible films are formed on the side which is opposite the side where the plurality of lead wires on the other flexible film are formed, being further characterized in that the sides of said flexible films (3, 8) where said ICs (4, 9) are mounted are the same as each other and said input lead wires are connected to said input circuit boards (2, 7) in said openings (12, 13, 14, 15).

Claim 5

A liquid-crystal display device according to claim 4, wherein each of said input circuit boards (2, 7) is provided with connection terminals (2a, 7a) for receiving external signals and output terminals on the obverse side, said output terminals being connected to the input lead wires on said flexible films (3,8) in said openings (12, 13, 14, 15) further characterized in that the flexible film (3) having lead wires (3a) formed on the reverse side is such that the associated output lead wires are connected to the electrodes on whichever of the first and second panels (1b) that have those electrodes formed on the side facing said reverse side whereas the flexible film (8) having lead wires (8a) formed on the obverse side is such that the associated output lead wires are connected to the electrodes on whichever of the first and second panels (1a) that have those electrodes formed on the side opposite to said obverse side.

Claim 6

A liquid-crystal display device according to claim 5, wherein one of said flexible films (3, 8) corresponds to the column electrodes on the liquid-crystal display panel (1) and the other flexible film corresponds to the row electrodes on said panel (1), said flexible films (3, 8) being two or more in number.

Claim 7

A liquid-crystal display device according to claim 6, wherein said flexible films (3, 8) are TABs.

Claim 8

In a process for producing a liquid-crystal display panel that comprises a liquid-crystal display panel that has a first panel (1b) having a plurality of electrodes arranged in a vertical direction and partly exposed at an end and a second panel (1a) having a plurality of electrodes arranged in a horizontal direction and partly exposed at an end, said panels (1a, 1b) being superposed in such a way that the sides where said electrodes are provided face inwardly, a first circuit board that is connected to said electrodes on the first panel (1b) and that receives a display signal from the outside, and a second circuit board that is connected to said electrodes on the second panel (1a) and that also receives a display signal from the outside, the improvement wherein each of said first and second circuit boards has an input circuit board (2, 7) for receiving external signals and a flexible film (3, 8) that carries on the obverse side an IC (4, 9) that is connected to said input circuit board (2, 7) for receiving a signal therefrom and outputting a drive signal for display, one of said flexible films (3) is such that the input and output terminals on said IC (4) are connected to a plurality of input and output lead wires (3a) that are provided on the reverse side of said film (3) whereas the other flexible film (8) is such that the input and output terminals on said IC (9) are connected to a plurality of input and output lead wires (8a) that are provided on the obverse side of said film (8), said process comprising: the step of connecting the output lead wires on one of said flexible films (3) to the electrodes on the first panel (1b) while connecting the output lead wires on the other flexible film (8) to the electrodes on the second panel (1a); the step of disposing said input circuit boards (2, 7) on the reverse side of said respective flexible films (3, 8); and the step of connecting, from said obverse side, the respective input lead wires on said flexible films (3, 8) to said output terminals on said input circuit boards (2, 7).

Claim 9

A process according to claim 8 wherein each of said flexible films (3, 8) has an opening (12, 14) in which part of said input lead wires are disposed, and the input lead wires on the respective flexible films (3, 8) are connected from the obverse side in positions corresponding to said openings.

Claim 10

A process according to claim 9 wherein said flexible films (3, 8) are TABs which are two or more in number, the output lead wires on one TAB being connected by means of an anisotropic conductive adhesive whereas the input lead wires on the other TAB being connected by soldering.

Claim 11

In a liquid-crystal display device comprising a liquid-crystal display panel (1) that has a first panel (1b) having a plurality of electrodes arranged in a vertical direction and partly exposed at an end and a second panel (1a) having a plurality of electrodes arranged in a horizontal direction and partly exposed at an end, said panels (1a, 1b) being superposed in such a way that the sides where said electrodes are provided face inwardly, a first circuit board (2) that is connected to said electrodes on the first panel (1b) and that receives a display signal from the outside, and a second circuit board (7) that is connected to said electrodes on the second panel (1a) and that also receives a display signal from the outside, the improvement wherein each of said first and second circuit boards has a flexible film (3, 8), wherein lead wires (8a) are formed on the obverse side of one flexible film (8) and lead wires (3a) are formed on the reverse side of said other flexible film (3), being further characterized in that at least part of said lead wires (3a, 8a) are connected to said liquid-crystal display panel (1) in such a way that said input circuit boards (2, 7) are located on the reverse side opposite to said mounting sides.