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    • 7. 发明授权
    • Display device
    • 显示设备
    • US07947981B2
    • 2011-05-24
    • US12013796
    • 2008-01-14
    • Shunpei YamazakiIkuko KawamataYasuyuki Arai
    • Shunpei YamazakiIkuko KawamataYasuyuki Arai
    • H01L29/04
    • H01L27/12G02F1/1345G02F1/13454H01L27/1233H01L29/78621
    • It is an object to provide a display device including a thin film transistor which can operate at high speed and is driven at a low voltage in a drive circuit region, and a thin film transistor having high voltage-resistance and high reliability in a pixel region. Accordingly, it is an object to provide a high reliable display device which consumes less power. A display device including a pixel region and a drive circuit region over a substrate having an insulating surface is provided. A thin film transistor is provided in each of the pixel region and the drive circuit region. A channel formation region in a semiconductor layer of the thin film transistor provided in the drive circuit region is formed to be locally thin, and the thickness of the channel formation region is smaller than that in the pixel region.
    • 本发明的目的是提供一种显示装置,其包括可以在驱动电路区域中以高速操作并以低电压驱动的薄膜晶体管,以及在像素区域中具有高电压和高可靠性的薄膜晶体管 。 因此,本发明的目的是提供一种消耗较少功率的高可靠性显示装置。 提供一种显示装置,其包括具有绝缘表面的基板上的像素区域和驱动电路区域。 在像素区域和驱动电路区域的每一个中设置薄膜晶体管。 设置在驱动电路区域中的薄膜晶体管的半导体层中的沟道形成区域局部变薄,并且沟道形成区域的厚度小于像素区域中的沟道形成区域。