Method for manufacturing a lower substrate of a liquid crystal display device
First Claim
1. A method for manufacturing a lower substrate of a liquid crystal display device, comprising:
- (A) providing a substrate;
(B) forming plural transistors individually comprising a gate, a source, and a drain, wherein the gate is disposed on the substrate, at least one semiconductor layer and at least one gate insulating layer are sandwiched in between the gate and the source/drain, and the drain does not electrically connect to the source;
(C) forming on the substrate in sequence a first photosensitive insulating layer and a black matrix, wherein the first insulating layer and the black matrix are the same type of photoresist;
(D) patterning the first photosensitive insulating layer and the black matrix to cover the transistor regions, wherein the pattern of the first photosensitive insulating layer is the same as that of the black matrix;
(E) forming on the substrate in sequence a second insulating layer and a color filter layer, wherein the second insulating layer and the color filter layer are the same type of photoresist;
(F) patterning the second insulating layer and the color filter layer, and simultaneously forming a first contact hole corresponding to the drain, wherein the first contact layer extends through the second insulating layer and the color filter layer so as to expose the part drain;
(G) selectively repeating the steps (E) and (F); and
(H) forming a patterned transparent electrode layer on the substrate, which electrically connects to the drain.
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Abstract
A method for manufacturing a lower substrate of a liquid crystal display device is disclosed and more particularly, a method for manufacturing a color filter layer on a lower substrate is disclosed. This method is achieved by using a photosensitive insulating layer as a passivation layer or an overcoat of a thin film transistor to reduce the number of masks, or of photographic steps. The photosensitive insulating layer used in the method has the characteristics of both photoresist and passivation layers so as to protect a thin film transistor from moisture and oxygen. In addition, the number of masks, or of photographic steps used in this method can be further reduced by ink-jet printing a color filter layer or by half-tone mask technique.
17 Citations
20 Claims
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1. A method for manufacturing a lower substrate of a liquid crystal display device, comprising:
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(A) providing a substrate; (B) forming plural transistors individually comprising a gate, a source, and a drain, wherein the gate is disposed on the substrate, at least one semiconductor layer and at least one gate insulating layer are sandwiched in between the gate and the source/drain, and the drain does not electrically connect to the source; (C) forming on the substrate in sequence a first photosensitive insulating layer and a black matrix, wherein the first insulating layer and the black matrix are the same type of photoresist; (D) patterning the first photosensitive insulating layer and the black matrix to cover the transistor regions, wherein the pattern of the first photosensitive insulating layer is the same as that of the black matrix; (E) forming on the substrate in sequence a second insulating layer and a color filter layer, wherein the second insulating layer and the color filter layer are the same type of photoresist; (F) patterning the second insulating layer and the color filter layer, and simultaneously forming a first contact hole corresponding to the drain, wherein the first contact layer extends through the second insulating layer and the color filter layer so as to expose the part drain; (G) selectively repeating the steps (E) and (F); and (H) forming a patterned transparent electrode layer on the substrate, which electrically connects to the drain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for manufacturing a lower substrate of a liquid crystal display device, comprising:
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(A) providing a substrate; (B) forming plural transistor regions individually having a gate, a source, and a drain, wherein the gate is disposed on the substrate, at least one semiconductor layer and at least one gate insulating layer are sandwiched in between the gate and the source/drain, and the drain does not electrically connect to the source; (C) forming on the substrate in sequence a passivation layer, a black matrix, and a first photosensitive insulating layer; (D) patterning the first photosensitive insulating layer and the black matrix to cover the transistor regions, wherein the pattern of the first photosensitive insulating layer is the same as that of the black matrix; (E) forming on the substrate in sequence a second insulating layer and a color filter layer; (F) patterning the second insulating layer and the color filter layer, and simultaneously forming a first contact hole in the second insulating layer and the color filter layer on the drain, wherein the first contact hole extends through the second insulating layer and the color filter layer so as to expose part of the passivation layer; (G) selectively repeating steps (E) and (F); (H) dryly etching the passivation layer in the first contact hole to expose part of the drain; and (I) forming a patterned transparent electrode layer on the substrate, which electrically connects to the drain. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification