| 摘要 |
A liquid crystal display device provides two substrates, a display medium, a plurality of light waveguides, a plurality of signal wires, and a plurality of light switching elements, being provided at crosspoints between said plurality of light waveguides and said plurality of signal wires. On the clad layer of the light waveguide, the p-type and the i-type of the a-Si:H are laminated. On one end of the top of the i-type, the n-type is overlapped with part of the signal wire. On the other end of the top of the i-type, the n-type is overlapped with the drain electrode. On the drain electrode, a pixel electrode is formed. That is, the light switching element has an element structure in which nipin type back-to-back diodes composed of two pin type diodes series-connected in reverse are ranged in parallel toward light transmission. Hence, the same light signal is transmitted to these two back-to-back diodes. This structure of light switching element makes it possible to offer a completely symmetric switching characteristic against voltage and realize a more simply-designed switching element and high display performance and reliability.
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