Liquid crystal display device and method of making same

• US 20040046904A1
• Filed: 09/12/2003
• Published: 03/11/2004
• Est. Priority Date: 07/25/1995
• Status: Active Grant

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Ono, Kikuo, Suzuki, Nobuyuki, Tanaka, Masahiro, Nakayoshi, Yoshiaki
• Granted Patent: US 6,839,106 B2
• Time in Patent Office: Days
• US Class Current: 349/43
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels
• CPC Class Codes: G02F 1/13458 Terminal pads
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• CPC Class Codes: G02F 1/136218 Shield electrodes
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 29/41733 for thin film transistors with insulated gate
• CPC Class Codes: H01L 29/78618 characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure silicide contacts, electrodes in general H01L29/458
• CPC Class Codes: H01L 29/78669 with inverted-type structure, e.g. with bottom gate

Abstract

A display device comprises a substrate; a gate line formed over the substrate; a first insulating film formed over the substrate and the gate line; a semiconductor film formed over the first insulating film; a drain electrode formed over the semiconductor film; a source electrode formed over the semiconductor film; a data line connected to the drain electrode and formed over the first insulating film; a second insulating film formed over the source electrode and the data line; a pixel electrode electrically connected to the source electrode and formed over the second insulating film; and a transparent conductive film connected to the data line through a contact hole formed in the second insulating film, the transparent conductive film being adapted to be electrically connected to an external drive circuit, wherein the transparent conductive film has a portion a lower surface of which is nearer to a surface of the substrate than is a lower surface of the transparent conductive film in the contact hole.

Claims

1. A display device comprising

a substrate;

a gate line formed over the substrate;

a first insulating film formed over the substrate and the gate line;

a semiconductor film formed over the first insulating film;

a drain electrode formed over the semiconductor film;

a source electrode formed over the semiconductor film;

a data line connected to the drain electrode and formed over the first insulating film;

a second insulating film formed over the source electrode and the first insulating film; and

a pixel electrode electrically connected to the source electrode and formed over the second insulating film,

wherein a conductive film is disposed between the substrate and the semiconductor film under the data line.

2. A display device according to claim 1, wherein the conductive film is disposed between the substrate and the first insulating film.

3. A display device, according to claim 2, wherein a width of the conductive film is larger than that of the semiconductor layer under the data line.

4. A display device according to claim 2, wherein the conductive film is an opaque metal.

5. A display device according to claim 4, wherein a transparent conductive film connected to the data line through a contact hole formed in the second insulating film, and the transparent conductive film is electrically connected to an external drive circuit.

6. A display device according to claim 4, wherein the conductive film is a light-blocking member.

7. A display device comprising:

a substrate;

a gate line formed over the substrate;

a first insulating film formed over the substrate and the gate line;

a semiconductor film formed over the first insulating film;

a drain electrode formed over the semiconductor film;

a source electrode formed over the semiconductor film;

a data line connected to the drain electrode and formed over the first insulating film;

a second insulating film formed over the source electrode and the first insulating film; and

a pixel electrode electrically connected to the source electrode and formed over the second insulating film,

wherein a conductive film is disposed between said substrate and the first insulating film in such a manner as to cover spacing between the pixel electrode and the data line adjacent thereto; and

wherein the semiconductor film is interposed between the first insulating film and a portion of the data line overlying the conductive film for increasing spacing between the data line and the conductive film to reduce electro-static coupling between the data line and the conductive film.

8. A display device according to claim 7, wherein a width of the data line is larger than that of the semiconductor layer.

9. A display device according to claim 7, wherein the conductive film is disposed between the substrate and the first insulating film in such a manner as to cover spacing between the pixel electrode and the data line adjacent thereto.

10. A display device according to claim 7, wherein the conductive film is an opaque metal.

11. A display device according to claim 10, wherein a transparent conductive film connected to the data line through a contact hole formed in the second insulating film, and the transparent conductive film is electrically connected to an external drive circuit.

12. A display device according to claim 10, wherein the conductive film is a light-blocking member.