Active solid-state devices (e.g. – transistors – solid-state diode – Non-single crystal – or recrystallized – semiconductor... – Field effect device in non-single crystal – or...
Reexamination Certificate
2005-06-21
2005-06-21
Zarabian, Amir (Department: 2822)
Active solid-state devices (e.g., transistors, solid-state diode
Non-single crystal, or recrystallized, semiconductor...
Field effect device in non-single crystal, or...
C257S069000, C257S204000, C257S257000, C257S291000, C257S359000
Reexamination Certificate
active
06909117
ABSTRACT:
A semiconductor display device which includes the polycrystalline silicon TFTs is constructed by a pixel region and a peripheral circuit and TFT characteristics required for each circuit are different. For example, an LDD structure TFT having a large off-current suppressing effect is suitable for the pixel region. Also, a GOLD structure TFT having a large hot carrier resistance is suitable for the peripheral circuit. When the performance of the semiconductor display device is improved, it is suitable that difference TFT structures are used for each circuit. In the case where the GOLD structure TFT having both Lov regions and Loff regions is formed, ion implantation into the Lov regions is independently performed using a negative resist pattern formed in a self alignment by a rear surface exposure method as a mask, and thus impurity concentrations of the Lov regions and the Loff regions can be independently controlled. Therefore, the GOLD structure TFT having both the hot carrier resistance and the off-current suppressing effect can be formed and the simplification of a manufacturing process of the semiconductor display device and the improvement of performance thereof are compatible with each other.
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Cook Alex McFarron Manzo Cummings & Mehler, Ltd.
Semiconductor Energy Laboratory Co,. Ltd.
Soward Ida M.
Zarabian Amir
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