Source: http://www.google.com/patents/US5793460?dq=5,987,610
Timestamp: 2018-01-18 16:18:43
Document Index: 57807550

Matched Legal Cases: ['art,\n20', 'art 12', 'art 12', 'art 12', 'art 12', 'art 12', 'art 12']

Patent US5793460 - Liquid crystal display device and method for manufacturing the same - Google Patents
A liquid crystal display device includes a plurality of scanning lines, having a first scanning line part and a second scanning line part, over a substrate and a plurality of signal lines formed over the substrate and crossing the scanning line at the first scanning line part. The first scanning line...http://www.google.com/patents/US5793460?utm_source=gb-gplus-sharePatent US5793460 - Liquid crystal display device and method for manufacturing the same
Publication number US5793460 A
Application number US 08/697,344
Publication number 08697344, 697344, US 5793460 A, US 5793460A, US-A-5793460, US5793460 A, US5793460A
Patent Citations (5), Referenced by (128), Classifications (10), Legal Events (8)
US 5793460 A
A liquid crystal display device includes a plurality of scanning lines, having a first scanning line part and a second scanning line part, over a substrate and a plurality of signal lines formed over the substrate and crossing the scanning line at the first scanning line part. The first scanning line part is formed of a material that is different from a low resistance metal. The second scanning line part and the signal line are formed of the low resistance metal. The first scanning line part is connected to the second part of the scanning line through a contact hole.
1. A liquid crystal display device having a transistor comprising:
an insulating layer over the substrate, the insulating layer having a contact hole;
at least one scanning line, the one scanning line including a first scanning line part and a second scanning line part, the first scanning line part contacting the second scanning line part through the contact hole; and
at least one signal line over the insulating layer and crossing the at least one scanning line at the first scanning line part,
wherein the first scanning line part includes a first conductive material having a first resistance, and the second scanning line part and the at least one signal line include a second conductive material having a second resistance, the second resistance being lower than the first resistance.
2. The liquid crystal display device according to claim 1, wherein the first scanning line part includes a high refractory metal.
8. The liquid crystal display device according to claim 1, wherein the contact hole has a size in a range of approximately 1 μm×1 μm to 10 μm×10 μm.
an insulating layer over the substrate, the insulating layer having first and second contact holes;
at least one scanning line, the one scanning line having a first scanning line part and a second scanning line part;
at least one signal line crossing the at least one scanning line at the first scanning line part;
a thin film transistor having a gate electrode, a source electrode, and a drain electrode over the substrate; and
a pixel electrode connected to one of the source and drain electrodes, wherein
the first scanning line part and the gate electrode include a first conductive material having a first resistance;
the at least one signal line, the source and drain electrodes of the thin film transistor, and the second scanning line part include a second conductive material having a second resistance, the second resistance being lower than the first resistance; and
the second scanning line part contacts the first scanning line part through the first contact hole and the gate electrode through the second contact hole.
11. The liquid crystal display device according to claim 10, wherein the first conductive material includes a high refractory metal.
17. The liquid crystal display device according to claim 10, wherein the contact holes have a size in a range of approximately 1 μm×1 μm to 10 μm×10 μm.
19. A method for manufacturing a liquid crystal display device having a transistor, the method comprising the steps of:
forming an insulating film over the substrate, the insulating film having a contact hole;
forming at least one scanning line having a first scanning line part and a second scanning line part, the second scanning line part contacting the first scanning line part through the contact hole; and
forming at least one signal line over the insulating film, the at least one signal line crossing the first scanning line part,
20. The method of manufacturing a liquid crystal display device according to claim 19, wherein the first scanning line part includes a high refractory metal.
26. The method of manufacturing a liquid crystal display device according to claim 19, wherein the contact hole is formed to a size in a range of approximately 1 μm×1 μm to 10 μm×10 μm.
28. A method for manufacturing a liquid crystal display device having a thin film transistor, the method comprising the steps of:
forming an insulating film over the substrate, the insulating film having first and second contact holes;
forming at least one scanning line, the one scanning line having a first scanning line part and a second scanning line;
forming at least one signal line crossing the scanning line at the first scanning line part;
forming a thin film transistor having a gate electrode, a source electrode, and a drain electrode over the substrate; and
forming a pixel electrode connected to one of the source electrode and the drain electrode, wherein
the second scanning line part contacts the first scanning line part through the first contact hole and contacts the gate electrode through the, second contact hole.
29. The method of manufacturing a liquid crystal display device according to claim 28, wherein the first conductive material includes a high refractory metal.
35. The method of manufacturing a liquid crystal display device according to claim 28, wherein the contact holes are formed to a size in a range of approximately 1 μm×1 μm to 10 μm×10 μm.
In the liquid crystal display device according to the second embodiment of the present invention, a scanning line includes a first scanning line part 12' and a second scanning line part 12". The first scanning line part 12' crosses a signal line 16". A gate electrode 12 is formed of a high refractory metal or a polysilicon doped with high concentration impurity (n+ polysilicon). The signal line 16" a source electrode 16, a drain electrode 16' and the second scanning line 12" part are formed of a low resistance metal. The second scanning line 12" is connected to the first scanning line part 12' through a scanning line contact hole 18. A gate electrode 12 is connected to the second scanning line 12" through a gate electrode contact hole 19. A source electrode 16 and a drain electrode 16' are connected to the source and drain regions of an active layer 23 through source and drain contact holes 21. Here, the size of the source and drain contact holes 21 is, for example, 1×1 μm to 10×10 μm. The number of the contact holes 21 can be more than one as shown in FIG. 4A so as to lower the contact resistance. Further, any contact hole in the first and second embodiments may be replaced with multiple contact holes to lower the contact resistance.
A method for manufacturing the liquid crystal display device according to the second embodiment of the present invention will be described below with reference to FIGS. 5A to 5E. As shown in FIG. 5A, a buffer layer 22, such as an oxide film or a nitride film, is formed on an insulating substrate 11. A semiconductor layer, such as polysilicon or amorphous silicon, is formed thereon and patterned to form an active layer 23 of a thin film transistor. Then, a gate insulating film 24 is formed on the entire resultant surface. On the gate insulating film 24, a high refractory metal layer including a metal silicide or any one of Cr, Ta, W and Ti, or a polysilicon doped with a high concentration of impurity (n+ polysilicon) is deposited and patterned to form a first scanning line part 12' and a gate electrode 12. Here, the first scanning line part 12' is formed such that it crosses a signal line to be formed in a later process.
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U.S. Classification 349/148, 349/147, 349/138
International Classification G02F1/1362, G02F1/136
Cooperative Classification H01L27/124, G02F1/136286
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:YANG, MYOUNG-SU;REEL/FRAME:008534/0730