Liquid crystal display device, method for fabricating the same, and portable telephone using the same
A liquid crystal display device comprises a liquid crystal display panel and a semiconductor integrated circuit for driving and controlling the liquid crystal display panel. The number of input/output wires connected to I/O terminals (bonding pads) of the semiconductor integrated circuit is reduced so as to simplify wiring patterns of the I/O wires, whereby degrees of freedom in arranging the I/O wiring patterns are enhanced. The panel has a pair of insulating substrate, and the semiconductor integrated circuit is mounted on one of the paired substrates. The semiconductor integrated circuit has a mode terminal which is fixed to a power supply potential or to a reference potential during operation of the integrated circuit, and power supply dummy terminals connected to the power supply potential or reference potential inside the semiconductor integrated circuit. The wiring patterns formed on the paired insulating substrates connect the mode terminal to the power supply dummy terminals.
1. A method of manufacturing a liquid crystal display device, comprising steps of:
(a) preparing a liquid crystal display panel having a plurality of conductive patterns;
(b) preparing a semiconductor integrated circuit device for controlling and driving the liquid crystal display panel, and the semiconductor integrated circuit device has long sides and short sides; and
(c) mounting the semiconductor integrated circuit device on the liquid crystal display panel,
wherein the semiconductor integrated circuit device comprises:
a plurality of first terminals for outputting a liquid crystal driving voltage;
a second terminal for receiving a power supply potential or a reference potential from outside of the semiconductor integrated circuit device;
a third terminal connected to the second terminal by a wiring formed inside of the semiconductor integrated circuit device; and
a fourth terminal fixed to the power supply potential or the reference potential via the third terminal during operation of the semiconductor integrated circuit device,
wherein the distance between the third terminal and the fourth terminal is shorter than the distance between the second terminal and the fourth terminal,
wherein the fourth terminal is a terminal to select different operational modes based on whether to receive the power supply potential or to receive the reference potential,
wherein the first terminals are arranged along one of the long sides,
wherein the second, third and fourth terminals are arranged along another of the long sides,
wherein each of the first, second, third and fourth terminals includes a bump,
wherein the second terminal is connected with one of the conductive patterns, and
wherein the third terminal is connected with the fourth terminal by another of the conductive patterns.
2. A method of manufacturing a liquid crystal display device according to claim 1 ,
wherein the one of the conductive patterns is not connected to any other terminals of the semiconductor integrated circuit device except the third and fourth terminals.
3. A method of manufacturing a liquid crystal display device according to claim 1 ,
wherein the liquid crystal display panel includes a glass substrate, and
wherein the conductive patterns are formed on the glass substrate.
4. A method of manufacturing a liquid crystal display device according to claim 1 ,
wherein each of the conductive patterns is made of a transparent conductive film.
5. A method of manufacturing a liquid crystal display device according to claim 1 ,
wherein the different operational modes are an I2C bus interface mode and a serial interface mode.
6. A method of manufacturing a liquid crystal display device according to claim 1 ,
wherein the bump is formed of a material including Au.