Substrate for liquid crystal display, liquid crystal display having the same, and method of manufacturing the same

• US 20030137628A1
• Filed: 01/17/2003
• Published: 07/24/2003
• Est. Priority Date: 01/18/2002
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Fujitsu Display Technologies Corporation (Fujitsu Limited)
• Inventors: Nagaoka, Kenichi
• Granted Patent: US 6,839,118 B2
• Time in Patent Office: Days
• US Class Current: 349/141
• CPC Class Codes: G02F 1/1309 Repairing; Testing
• CPC Class Codes: G02F 1/133388 with constructional differences between the display region and the peripheral region
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/136254 Checking; Testing
• CPC Class Codes: G02F 1/136263 Line defects
• CPC Class Codes: G02F 1/136272 Auxiliary lines
• CPC Class Codes: G02F 2201/122 having a particular pattern

Abstract

The invention relates to a substrate for a liquid crystal display used as a display of an information apparatus, a liquid crystal display having the same, and a method of manufacturing the same and provides a substrate for a liquid crystal display on which the position of a defect can be easily detected to achieve high display quality, a liquid crystal display having the same, and a method of manufacturing the same. A configuration is employed which includes a glass substrate, gate bus lines and drain bus lines formed on the glass substrate such that they intersect each other through an insulating film, pixel regions provided in the form of a matrix on the substrate, a TFT formed at each of the pixel regions, a storage capacitor electrode formed at each of the pixel regions, a connection wiring which is formed of the same material as that of a source electrode of the TFT and the storage capacitor electrode and which electrically connects the source electrode and the storage capacitor electrode, CF resin layers formed at the pixel regions, and a pixel electrode formed at each of the pixel regions on the CF resin layers.

Claims

1. A substrate for a liquid crystal display, comprising:

a base substrate that sandwiches a liquid crystal in combination with an opposite substrate provided opposite thereto;

a plurality of bus lines formed on the base substrate such that they intersect each other with an insulation film interposed therebetween;

pixel regions provided in the form of a matrix on the base substrate;

a thin film transistor formed at each of the pixel regions;

a storage capacitor electrode formed at each of the pixel regions; and

a connection wiring which is formed of the same material as that of a source electrode of the thin film transistor and the storage capacitor electrode and which electrically connects the source electrode and the storage capacitor electrode.

2. A substrate for a liquid crystal display according to claim 1, wherein the connection wiring is formed in the pixel regions.

3. A substrate for a liquid crystal display according to claim 1, further comprising:

color filter layers formed at the pixel regions; and

a pixel electrode formed at each of the pixel regions on the color filter layers.

4. A substrate for a liquid crystal display according to claim 3, wherein the pixel electrode has a stripe-like electrode having a trunk section extending in parallel with or perpendicularly to the bus lines and a plurality of branch sections branching from the trunk section and extending at an angle to the bus lines and spaces in the stripe-like electrode and wherein the connection wiring is formed in an overlapping relationship with the strike-like electrode when viewed in a direction perpendicular to the substrate surface.

5. A substrate for a liquid crystal display according to claim 4, wherein the connection wiring is formed in an overlapping relationship with the trunk section when viewed in a direction perpendicular to the substrate surface.

6. A substrate for a liquid crystal display according to claim 3, further comprising repair wirings formed for repairing the bus lines and intersecting portions where the bus lines and the repair wirings intersect with an insulation film interposed therebetween, wherein at least two of the color filter layers are formed by laminating each other on the intersecting portions.

7. A substrate for a liquid crystal display according to claim 3, further comprising a short-ring formed around the base substrate and a thin film transistor for preventing electrostatic discharge damage that connects the short-ring and the plurality of bus lines, wherein a gate electrode and a drain electrode of the thin film transistor for preventing electrostatic discharge damage are electrically connected through a contact hole formed in a gate insulation film.

8. A liquid crystal display having a pair of substrates and a liquid crystal sealed between the pair of substrates, wherein a substrate for a liquid crystal display according to claim 1 is used as one of the substrates.

9. A method of manufacturing a substrate for a liquid crystal display comprising the steps of:

forming a source electrode and a storage capacitor electrode of a thin film transistor and forming a connection wiring for electrically connecting the source electrode and the storage capacitor electrode simultaneously; and

performing an array inspection before forming color filter layers on the source electrode and the storage capacitor electrode.

10. A method of detecting a defect of a liquid crystal display in which an array inspection is performed on a thin film transistor substrate having color filter layers formed on a bus line layer to inspect a defect on a bus line, the method comprising the step of performing a visual inspection on a defect using an infrared microscope that detects and visualizes the intensity of infrared rays after the defect is detected at the array inspection.