Apparatus for providing light shielding in a liquid crystal display
AssigneeSeiko Epson Corporation
InventorMasao Murade
Life of this patent
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Abstract
A leak current due to the effect of light reflected by a polarizing plate or the like is suppressed in pixel switching TFTs in a liquid crystal device and a projection type display device comprising the liquid crystal device, and the characteristics of pixel switching TFT are stabilized. In a liquid crystal device substrate of a liquid crystal device, a first light shielding film is provided below at least the channel region of pixel switching TFTs, extending along scanning lines and connected to constant potential wiring for supplying a constant potential on an outside of the pixel region to fix the potential of the first light shielding film.
Claims29
A liquid crystal device comprising:
- a liquid crystal device substrate including a display region in which pixels are formed in a matrix by a plurality of data lines and a plurality of scanning lines;
- a peripheral driving circuit connected to at least one of the data lines and the scanning lines on an outer peripheral side of the display region;
- a plurality of thin film transistors connected to the data lines and the scanning lines, the thin film transistors each having a channel region;
- a liquid crystal held between the liquid crystal device substrate and an opposite substrate;
- and
- a conductive first light shielding film formed below at least the channel region of each of the thin film transistors so as to overlap with the channel region through an insulation film so that a constant voltage is applied to the first light shielding film.
A method of manufacturing a liquid crystal device, comprising:
- forming a liquid crystal device substrate including a display region in which pixels are formed in a matrix by a plurality of data lines and a plurality of scanning lines;
- forming a peripheral driving circuit connected to at least one of the data lines and the scanning lines on an outer peripheral side of the display region;
- forming a plurality of thin film transistors connected to the data lines and the scanning lines, the thin film transistors each having a channel region;
- disposing a liquid crystal between the liquid crystal device substrate and an opposite substrate;
- and
- forming a conductive first light shielding film below at least the channel region of each of the thin film transistors so as to overlap with the channel region through an insulation film so that a constant voltage is applied to the first light shielding film.
Dependencies are inferred from the claim text.