Source: https://patents.google.com/patent/US6590229B1/en
Timestamp: 2019-07-21 18:44:49
Document Index: 449941290

Matched Legal Cases: ['application No. 10', 'application No. 7', 'application No. 7', 'application No. 7', 'application No. 7', 'application No. 7', 'application No. 7', 'application No. 10', 'application No. 9', 'application No. 09', 'application No. 09', 'application No. 08', 'application No. 09', 'application No. 09']

US6590229B1 - Semiconductor device and process for production thereof - Google Patents
US6590229B1
US6590229B1 US09/487,432 US48743200A US6590229B1 US 6590229 B1 US6590229 B1 US 6590229B1 US 48743200 A US48743200 A US 48743200A US 6590229 B1 US6590229 B1 US 6590229B1
US09/487,432
1999-01-21 Priority to JP11-013275 priority Critical
1999-01-21 Priority to JP1327599 priority
2000-01-19 Application filed by Semiconductor Energy Laboratory Co Ltd filed Critical Semiconductor Energy Laboratory Co Ltd
2000-05-30 Assigned to SEMICONDUCTOR ENERGY LABORATORY CO., LTD. reassignment SEMICONDUCTOR ENERGY LABORATORY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUKUNAGA, TAKESHI, KOYAMA, JUN, SHIBATA, HIROSHI, YAMAZAKI, SHUNPEI
2003-07-08 Publication of US6590229B1 publication Critical patent/US6590229B1/en
Then, the mask film 209 (100 nm thick) of silicon oxide is formed on the crystalline silicon film 208, and on it is formed the resist mask 210. Using the resist mask 210 as a mask, the mask film 209 is etched so as to form the openings 211 a-211 c.
In this state, an element (phosphorus in this embodiment) belonging to Group 15 of the periodic table is added so as to form the phosphorus-doped regions 212 a-212 c. Incidentally, the concentration of phosphorus added should be 5×1018 to 1×1020 atoms/cm3 (preferably 1×1019 to 5×1019 atoms/cm3). However, the concentration of phosphorus added is not limited to this range. It varies depending on the temperature and time of the subsequent gettering step and on the area of the phosphorus doping region. See FIG. 2C.
FIG. 14B shows the structure of the pixel portion according to one embodiment. In the case of the structure shown in FIG. 14B, the LDD regions 43 a and 43 b are formed only at one side close to the source region or the drain region. In other words, the LDD region is not formed between the two channel forming regions 44 a and 44 b.
In the case of a pixel TFT, the source region and the drain region are interchanged frequently because charging and discharging are repeated. Therefore, the structure shown in FIG. 14B is equivalent to forming the LDD region at the drain region side of the channel forming region no matter which becomes the drain region. Conversely, since an electric field does not concentrate in the region between the channel forming regions 44 a and 44 b, eliminating the LDD region (which becomes the resistance component) is an effective way to increase the on-current (the current which flows when the TFT is ON).
FIG. 19 is a circuit diagram of an active matrix type EL display. There are shown the display region 81, the X-direction (gate) driving circuit 82, and the Y-direction (source) driving circuit 83. Each pixel in the display region 81 has the TFT 84 for switching, the capacitor 85, the TFT 86 for current control, and the organic EL element 87. The TFT 84 for switching is connected to the X-direction (gate) signal line 88 a (or 88 b) and to the Y-direction (source) signal line 89 a (or 89 b, 89 c). The TFT 86 for current control is connected to the source lines 90 a and 90 b.
The active matrix type EL display in this embodiment is characterized in that the gate insulating film of the TFT used for the X-direction driving circuit 82 and the Y-direction driving circuit 83 is thinner than that of the TFT 84 for switching and the TFT 86 for current control. The capacitor 85 is the storage capacitance of the same structure as shown in Embodiments 1, 4, 7, 8, and 9.
a pixel portion including a plurality of pixels, each of the pixels including a pixel TFT and a storage capacitance;
said pixel TFT comprising:
a light blocking film;
an insulating film including at least a first insulating layer and a second insulating layer;
an active film being formed over the light blocking film with the insulating film interposed therebetween;
said storage capacitance comprising:
an electrode being formed in a same layer as the light blocking film;
an dielectric material;
a semiconductor film having a same material as a drain region of the pixel TFT,
wherein the dielectric material is formed of a portion of the insulating film.
a pixel portion having a plurality of pixels, each of the pixels including a pixel TFT and a storage capacitance;
wherein the dielectric material is formed of a portion of the insulating film while the other portion of the insulating film is removed.
a pixel portion having a plurality of pixels, each of the plurality of pixels including a pixel TFT and a storage capacitance;
a first insulating film being in contact with the light blocking film;
a second insulating film;
an active film being formed over the light blocking film with the second insulating film interposed therebetween;
wherein the second insulating film is in contact with the active layer;
the second insulating film;
a semiconductor film having a same material as a drain region of the pixel TFT.
wherein the second insulating film has a thickness smaller than ⅕ of a total thickness of the first insulating film and the second insulating film.
wherein the semiconductor device includes a driving circuit portion and the pixel portion over a same substrate,
wherein the driving circuit portion includes a driving TFT, and
wherein the driving TFT has a gate insulating film thinner than the pixel TFT.
wherein a gate insulating film of the pixel TFT has a thickness in a range of 50-200 nm while the gate insulating film of the driving TFT has a thickness in a range of 5-50 nm.
wherein the semiconductor device is an EL display device,
wherein an EL element is electrically connected to the pixel TFT.
wherein the semiconductor device is an electric appliance selected from the group consisting of a video camera, a digital camera, a projector, a projection TV, a goggle type display (a head mount display), a navigation system, an audio playback device, a note-type personal computer, a game machine, a portable information terminal (a mobile computer, a portable telephone, a portable game machine, and an electronic book), and a video reproducing device with a recording medium.
9. A device according to claim 2,
10. A device according to claim 9,
11. A device according to claim 2,
12. A device according to claim 2,
13. A device according to claim 3,
15. A device according to claim 3,
16. A device according to claim 3,
US09/487,432 1999-01-21 2000-01-19 Semiconductor device and process for production thereof Active US6590229B1 (en)
JP11-013275 1999-01-21
JP1327599 1999-01-21
US10/453,034 US6890784B2 (en) 1999-01-21 2003-06-03 Semiconductor device and process for production thereof
US11/120,175 US7208766B2 (en) 1999-01-21 2005-05-02 Semiconductor device and process for production thereof
US11/738,599 US7414267B2 (en) 1999-01-21 2007-04-23 Semiconductor device and process for production thereof
US12/193,900 US7727836B2 (en) 1999-01-21 2008-08-19 Semiconductor device and process for production thereof
US10/453,034 Division US6890784B2 (en) 1999-01-21 2003-06-03 Semiconductor device and process for production thereof
US6590229B1 true US6590229B1 (en) 2003-07-08
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US09/487,432 Active US6590229B1 (en) 1999-01-21 2000-01-19 Semiconductor device and process for production thereof
US10/453,034 Active 2020-01-20 US6890784B2 (en) 1999-01-21 2003-06-03 Semiconductor device and process for production thereof
US11/120,175 Active US7208766B2 (en) 1999-01-21 2005-05-02 Semiconductor device and process for production thereof
US11/738,599 Active US7414267B2 (en) 1999-01-21 2007-04-23 Semiconductor device and process for production thereof
US12/193,900 Expired - Fee Related US7727836B2 (en) 1999-01-21 2008-08-19 Semiconductor device and process for production thereof
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KR (2) KR100652817B1 (en)
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAMAZAKI, SHUNPEI;KOYAMA, JUN;SHIBATA, HIROSHI;AND OTHERS;REEL/FRAME:010818/0853;SIGNING DATES FROM 20000512 TO 20000515