Method for manufacturing a liquid crystal display
First Claim
1. A method for manufacturing a liquid crystal display, comprising the steps of:
- forming a gate electrode and a gate pad by depositing a first metal film and a second metal film over a substrate in a TFT area and a gate-pad connecting area, respectively, by a first photolithography process;
forming an insulating film over the gate electrode and the gate pad;
forming a semiconductor film pattern over the insulating film in the TFT area by a second photolithography process;
forming a source electrode/drain electrode and pad electrode in the TFT portion and pad portion, respectively, using a third photolithography process, the source electrode/drain electrode and pad electrode all being comprised of a third metal film;
forming a passivation film pattern by a fourth photolithography process, the passivation film exposing a portion of the drain electrode, a portion of the gate pad, and a portion of the pad electrode;
exposing the first metal film by etching a portion of the second metal film that comprises the gate pad using the passivation film pattern as a mask; and
forming a pixel electrode connected to the drain electrode of the TFT area by a fifth photolithography process, the pixel electrode acting to connect the gate pad of the gate-pad connecting area to the pad electrode of the pad area.
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Abstract
A method for manufacturing a liquid crystal display which reduces the number of photolithography processes is provided. The method includes the steps of forming a gate electrode and a gate pad by depositing a first metal film and a second metal film on a substrate of a TFT area and a gate-pad connecting area, respectively, in the described order, by a first photolithography process, forming an insulation film on the entire surface of the substrate on which the gate electrode and the gate pad are formed, forming a semiconductor film pattern on the insulating film of the TFT area by a second photolithography process, forming a source electrode/drain electrode and pad electrode composed of a third metal film using a third photolithography process in the TFT portion and pad portion, respectively, forming a passivation film pattern which exposes a portion of the drain electrode, a portion of the gate pad, and a portion of the pad electrode by a fourth photolithography process, exposing the first metal film by etching the second metal film which constitutes the gate pad using the passivation film pattern as a mask, and forming a pixel electrode connected to the drain electrode of the TFT area for connecting the gate pad of the gate-pad connecting area to the pad electrode of the pad area using a fifth photolithography process. Therefore, it is possible to reduce the number of photolithography processes, to improve the manufacturing yield, and to suppress growth of a hillock of an Al film.
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Citations
37 Claims
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1. A method for manufacturing a liquid crystal display, comprising the steps of:
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forming a gate electrode and a gate pad by depositing a first metal film and a second metal film over a substrate in a TFT area and a gate-pad connecting area, respectively, by a first photolithography process;
forming an insulating film over the gate electrode and the gate pad;
forming a semiconductor film pattern over the insulating film in the TFT area by a second photolithography process;
forming a source electrode/drain electrode and pad electrode in the TFT portion and pad portion, respectively, using a third photolithography process, the source electrode/drain electrode and pad electrode all being comprised of a third metal film;
forming a passivation film pattern by a fourth photolithography process, the passivation film exposing a portion of the drain electrode, a portion of the gate pad, and a portion of the pad electrode;
exposing the first metal film by etching a portion of the second metal film that comprises the gate pad using the passivation film pattern as a mask; and
forming a pixel electrode connected to the drain electrode of the TFT area by a fifth photolithography process, the pixel electrode acting to connect the gate pad of the gate-pad connecting area to the pad electrode of the pad area. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for manufacturing a liquid crystal display, comprising the steps of:
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forming a gate electrode and a gate pad by depositing a first metal film and a second metal film over a substrate of a TFT area and a pad area, respectively, by a first photolithography process;
forming an insulating film over the gate electrode and the gate pad;
forming a semiconductor film pattern over the insulating film in the TFT area by a second photolithography process;
forming a source electrode and a drain electrode in the TFT area by a third photolithography process, the source electrode and the drain electrode comprising a third metal film;
forming a passivation film pattern that exposes a portion of the drain electrode of the TFT area and a portion of the gate pad of the pad area by forming a passivation film over the source electrode and the drain electrode and performing a fourth photolithography process on the passivation film and the insulating film;
exposing the first metal film of the pad area by etching the second metal film using the passivation film pattern as a mask; and
forming a pixel electrode that is connected to the drain electrode of the TFT area and contacts the first metal film of the pad area by a fifth photolithography process. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A TFT substrate, comprising:
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a gate electrode comprising a first metal film over a substrate and a second metal film over the first metal film;
a gate pad consisting the first metal film and a portion of a removed area of the second metal film;
an insulated film over the gate electrode and having an exposed area of the first metal film over the gate pad;
a semiconductor film pattern over the insulated film;
a source electrode formed over a first portion of the semiconductor film pattern;
a drain electrode formed over a second portion of the semiconductor film pattern;
a passivation film pattern formed over the source electrode, having a contact hole over the drain electrode and having an exposed area of the first metal film of the gate pad;
a first pixel electrode pattern electrically contacted to the drain electrode on the passivation film pattern; and
a second pixel electrode pattern electrically contacted to the exposed area of the first metal film of the gate pad. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A TFT substrate, comprising:
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a gate electrode comprising at least a refractory metal film formed over a first portion of a substrate;
a gate pad comprising the refractory metal film formed on a second portion of a substrate;
an insulated film formed over the gate electrode and having an exposed area corresponding to the refractory metal film of the gate pad;
a semiconductor film pattern formed over the insulated film;
a source electrode formed over a first portion of the semiconductor film pattern;
a drain electrode formed over a second portion of the semiconductor film pattern;
a passivation film pattern formed over the source electrode, having a contact hole over the drain electrode and having an exposed area corresponding to the refractory metal film of the gate pad;
a first pixel electrode pattern electrically contacted to the drain electrode on the passivation film pattern; and
a second pixel electrode electrically contacted to the exposed area of the refractory metal film of the gate pad. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification