| 摘要 |
In a TFT array substrate 10 of an electrooptical device, a scanning line 3a, a drain electrode 11, a first light shield layer 13, and a data line 3a are laminated over a channel region 1a' of a TFT 30 and a second light shield layer 14 is laminated beneath the channel region 1a'. A side wall formation trench 16 is formed beside the channel region 1a' of the TFT 30, and in the side wall formation trench a conductive layer having a light shield property is concurrently formed with the first light shield layer 13 thereby a light shield side wall 131 is formed. By three-dimensionally blocking light's entry towards the channel region 1a', obliquely or laterally incident light is prevented from entering the channel region of a pixel switching TFT, and the TFT 30 is free from erratic operations and reliability degradation.
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