US 6,476,882 B1Granted

Liquid-crystal display panel and repair method thereof

AssigneeNEC Corporation

InventorHiroshi Sakurai

Life of this patent

Estimating the term…

Loading patent…

Abstract

An active-matrix addressing LCD panel is provided, in which a bypass can be readily formed for a broken one of the source/drain bus lines without degrading any display characteristic and without increasing the number of man-hour. A TFT-array substrate of the panel has gate bus lines and source/drain bus lines extending perpendicular to each other, pixel areas defined by the gate and source/drain bus lines, TFTs formed near respective intersections of the gate and source/drain bus lines in the corresponding pixel areas, pixel electrodes formed in the respective pixel areas, and light-shielding layers formed in the respective pixel areas. Each of the source/drain bus lines is overlapped with a corresponding one of the light-shielding layers at first and second locations. The first and second locations are defined in such a way that a bypass for each of the source/drain bus lines is formed by electrically connecting each of the source/drain bus lines to the corresponding one of the light-shielding layers at the associated first and second locations.

Claims6

Dependent claims

An LCD panel including a TFT-array substrate, said TFT-array substrate comprising:

a plate made of a substantially flat transparent dielectric material;
gate bus lines formed in a first conductive patterned layer on said plate to extend along a first direction;
source/drain bus lines formed in a second conductive patterned layer on said plate to extend along a second direction substantially perpendicular to said first direction;
a plurality of pixel areas formed on said plate;
a plurality of TFTs formed near respective intersections of said gate bus line and said source/drain bus lines, each TFT contacting the adjacent one of the plurality of pixel areas, the adjacent gate bus line and the adjacent source/drain bus line;
a plurality of pixel electrodes formed in a third conductive patterned layer disposed over the pixel areas;
light-shielding layers formed in said first conductive patterned layer in a region proximate to said pixel areas, the light-shielding layers not electrically connected to the pixel electrodes;
each of said TFTs having a gate electrode electrically connected to one of said gate bus lines, one of a pair of source/drain electrodes electrically connected to one of said source/drain bus lines and another one of the pair connected to one of said pixel electrodes, respectively;
each of said source/drain bus lines having at least one region which is disposed to overlap at least a part of one of said light-shielding layers at least at first and second locations;
said first and second locations being defined in such a way that a bypass for a portion of each of said source/drain bus lines is formed by electrically connecting each of said source/drain bus lines to corresponding ones of said light-shielding layers at said first and second locations.

7 more elements

A repair method of an LCD panel including a TFT-array substrate, comprising:

said TFT-array substrate having a plate made of a substantially flat transparent dielectric material, gate bus lines formed in a first conductive patterned layer on said plate to extend along a first direction, source/drain bus lines formed in a second conductive patterned layer on said plate to extend along a second direction substantially perpendicular to said first direction, pixel areas formed on said substantially flat transparent plate, TFTs formed near respective intersections of said gate bus line and said source/drain bus lines in said corresponding pixel areas, pixel electrodes formed in a third conductive patterned layer in said respective pixel areas, and light-shielding layers formed in said first conductive patterned layer in a region proximate to said respective pixel areas, the light-shielding layers not electrically connected to the pixel electrodes;
each of said TFTs having a gate electrode electrically connected to a corresponding one of said gate bus lines, a pair of source/drain electrodes electrically connected to a corresponding one of said source/drain bus lines and a corresponding one of said pixel electrodes, respectively;
each of said source/drain bus lines having an overlapped region with at least a part of a corresponding one of said light-shielding layers at first and second locations;
said first and second locations being defined in such a way that a bypass for a portion of each of said source/drain bus lines is formed by electrically connecting each of said source/drain bus lines to corresponding ones of said light-shielding layers at said overlapped first and second locations;
said repair method further comprising:
a step of irradiating a laser beam to said first and second locations of a broken one of said source/drain bus and a corresponding one of said light-shielding layers, thereby forming an electrical bypass for said broken one of said source/drain bus lines with the use of said corresponding one of said light-shielding layer.

3 more elements

Dependencies are inferred from the claim text.