Liquid crystal display device
First Claim
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1. A liquid crystal display device, comprising:
- a plurality of pixels each including reflective portion and transmissive portion;
the plurality of pixels each comprising;
a thin film transistor over a substrate;
a first common electrode in the transmissive portion;
a reflective electrode in the reflective portion;
a first insulating layer over the first common electrode and the reflective electrode;
a second insulating layer over the first insulating layer in the reflective portion;
a second common electrode and a pixel electrode over the second insulating layer in the reflective portion, the second common electrode and the pixel electrode being over the first insulating layer in the transmissive portion; and
a liquid crystal material over the pixel electrode and the second common electrode.
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Abstract
It is an object of the present invention to apply a sufficient electrical field to a liquid crystal material in a horizontal electrical field liquid crystal display device typified by an FFS type. In a horizontal electrical field liquid crystal display, an electrical field is applied to a liquid crystal material right above a common electrode and a pixel electrode using plural pairs of electrodes rather than one pair of electrodes. One pair of electrodes includes a comb-shaped common electrode and a comb-shaped pixel electrode. Another pair of electrodes includes a common electrode provided in a pixel portion and the comb-shaped pixel electrode.
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Citations
26 Claims
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1. A liquid crystal display device, comprising:
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a plurality of pixels each including reflective portion and transmissive portion; the plurality of pixels each comprising; a thin film transistor over a substrate; a first common electrode in the transmissive portion; a reflective electrode in the reflective portion; a first insulating layer over the first common electrode and the reflective electrode; a second insulating layer over the first insulating layer in the reflective portion; a second common electrode and a pixel electrode over the second insulating layer in the reflective portion, the second common electrode and the pixel electrode being over the first insulating layer in the transmissive portion; and a liquid crystal material over the pixel electrode and the second common electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A liquid crystal display device, comprising:
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a plurality of pixels each including reflective portion and transmissive portion; the plurality of pixels each comprising; a thin film transistor over a substrate; a first common electrode in the transmissive portion and the reflective portion; a reflective electrode in the reflective portion; a first insulating layer over the first common electrode and the reflective electrode; a second insulating layer over the first insulating layer in the reflective portion; a second common electrode and a pixel electrode over the second insulating layer in the reflective portion, the second common electrode and the pixel electrode being over the first insulating layer in the transmissive portion; a third insulating layer interposed between the first common electrode and the reflective electrode; and a liquid crystal material over the pixel electrode and the second common electrode. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A liquid crystal display device, comprising:
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a plurality of pixels each including reflective portion and transmissive portion; the plurality of pixels each comprising; a thin film transistor over a substrate; a first common electrode in the transmissive portion and the reflective portion; a reflective electrode in the reflective portion, the reflective electrode being stacked on the first common electrode; a first insulating layer over the first common electrode and the reflective electrode; a second insulating layer over the first insulating layer in the reflective portion; a second common electrode and a pixel electrode over the second insulating layer in the reflective portion, the second common electrode and the pixel electrode being over the first insulating layer in the transmissive portion; a third insulating layer interposed between the first common electrode and the reflective electrode; and a liquid crystal material over the pixel electrode and the second common electrode. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification