IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0553031
(2012-07-19)
|
등록번호 |
US-8610861
(2013-12-17)
|
우선권정보 |
JP-2000-073577 (2000-03-16) |
발명자
/ 주소 |
- Yamazaki, Shunpei
- Hirakata, Yoshiharu
|
출원인 / 주소 |
- Semiconductor Energy Laboratory Co., Ltd.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
254 |
초록
▼
In a liquid crystal display device of an IPS system, to realize reduction of manufacturing cost and improvement of yield by decreasing the number of steps for manufacturing a TFT. A channel etch type bottom gate TFT structure, where patterning of a source region and a drain region and patterning of
In a liquid crystal display device of an IPS system, to realize reduction of manufacturing cost and improvement of yield by decreasing the number of steps for manufacturing a TFT. A channel etch type bottom gate TFT structure, where patterning of a source region and a drain region and patterning of a source wiring and a pixel electrode are carried out by the same photomask.
대표청구항
▼
1. A liquid crystal display device comprising: a gate wiring over an insulating surface;a common wiring over the insulating surface;a first insulating film comprising silicon nitride over the gate wiring and the common wiring;a first amorphous semiconductor film over the first insulating film;a pair
1. A liquid crystal display device comprising: a gate wiring over an insulating surface;a common wiring over the insulating surface;a first insulating film comprising silicon nitride over the gate wiring and the common wiring;a first amorphous semiconductor film over the first insulating film;a pair of second amorphous semiconductor films over the first amorphous semiconductor film;a source wiring over one of the pair of second amorphous semiconductor films;a second insulating film comprising silicon nitride over the source wiring;a common electrode electrically connected to the common wiring;a transparent electrode over the common electrode, and electrically connected to the other of the pair of second amorphous semiconductor films; andan alignment film over the transparent electrode and the common electrode;wherein the source wiring overlaps with the first amorphous semiconductor film and one of the pair of second amorphous semiconductor films,wherein the first amorphous semiconductor film and one of the pair of second amorphous semiconductor films extend along the source wiring,wherein the second insulating film is in contact with the first amorphous semiconductor film and the pair of second amorphous semiconductor films in a region overlapping with the gate wiring,wherein the transparent electrode and the common electrode are disposed so that liquid crystal molecules are controlled by an electric field produced between the transparent electrode and the common electrode, andwherein the transparent electrode and the common wiring are overlapped with each other. 2. The liquid crystal display device according to claim 1, wherein the common electrode is formed in a same layer as the common wiring. 3. The liquid crystal display device according to claim 1, wherein the gate wiring and the common wiring are formed by patterning a conductive layer. 4. The liquid crystal display device according to claim 1, wherein the gate wiring comprises an element selected from the group consisting of Al, Cu, Ti, Mo, W, Ta, Nd, and Cr, and an alloy of the elements. 5. A liquid crystal display device comprising: a gate wiring over an insulating surface;a common wiring over the insulating surface;a first insulating film comprising silicon nitride over the gate wiring and the common wiring;a first amorphous semiconductor film over the first insulating film;a pair of second amorphous semiconductor films over the first amorphous semiconductor film;a source wiring over one of the pair of second amorphous semiconductor films;a second insulating film comprising silicon nitride over the source wiring;a common electrode electrically connected to the common wiring;a transparent electrode over the common electrode, and electrically connected to the other of the pair of second amorphous semiconductor films;an alignment film over the transparent electrode and the common electrode; anda terminal portion comprising a conductive layer formed of a same layer as the transparent electrode,wherein the source wiring overlaps with the first amorphous semiconductor film and one of the pair of second amorphous semiconductor films,wherein the first amorphous semiconductor film and one of the pair of second amorphous semiconductor films extend along the source wiring,wherein the second insulating film is in contact with the first amorphous semiconductor film and the pair of second amorphous semiconductor films in a region overlapping with the gate wiring,wherein the transparent electrode and the common electrode are disposed so that liquid crystal molecules are controlled by an electric field produced between the transparent electrode and the common electrode, andwherein the transparent electrode and the common wiring are overlapped with each other. 6. The liquid crystal display device according to claim 5, wherein the common electrode is formed in a same layer as the common wiring. 7. The liquid crystal display device according to claim 5, wherein the gate wiring and the common wiring are formed by patterning a second conductive layer. 8. The liquid crystal display device according to claim 5, wherein the gate wiring comprises an element selected from the group consisting of Al, Cu, Ti, Mo, W, Ta, Nd, and Cr, and an alloy of the elements. 9. A liquid crystal display device comprising: a gate wiring over an insulating surface;a common wiring over the insulating surface;a first insulating film over the gate wiring and the common wiring;a first amorphous semiconductor film over the first insulating film;a pair of second amorphous semiconductor films over the first amorphous semiconductor film;a source wiring over one of the pair of second amorphous semiconductor films;a second insulating film over the source wiring;a common electrode electrically connected to the common wiring;a transparent electrode over the common electrode, and electrically connected to the other of the pair of second amorphous semiconductor films;an alignment film over the transparent electrode and the common electrode; anda terminal portion comprising a conductive layer formed of a same layer as the transparent electrode,wherein the source wiring overlaps with the first amorphous semiconductor film and one of the pair of second amorphous semiconductor films,wherein the first amorphous semiconductor film and one of the pair of second amorphous semiconductor films extend along the source wiring,wherein the second insulating film is in contact with the first amorphous semiconductor film and the pair of second amorphous semiconductor films in a region overlapping with the gate wiring,wherein the transparent electrode and the common electrode are disposed so that liquid crystal molecules are controlled by an electric field produced between the transparent electrode and the common electrode, andwherein the transparent electrode and the common wiring are overlapped with each other. 10. The liquid crystal display device according to claim 9, wherein the common electrode is formed in a same layer as the common wiring. 11. The liquid crystal display device according to claim 9, wherein the gate wiring and the common wiring are formed by patterning a second conductive layer. 12. The liquid crystal display device according to claim 9, wherein the gate wiring comprises an element selected from the group consisting of Al, Cu, Ti, Mo, W, Ta, Nd, and Cr, and an alloy of the elements.
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