Semi-transmissive liquid crystal display device
First Claim
Patent Images
1. A semi-transmissive liquid crystal display device comprising:
- a pair of substrates disposed facing each other through a liquid crystal layer and defined as a lower substrate and an opposing substrate;
a plurality of pixel areas provided in one of said pair of substrates, each of said plurality of pixel areas having a reflective region and a transmissive region therein and further having an electrode configuration allowing electrodes to drive liquid crystal molecules with a horizontal electric field generated between said electrodes in said transmissive region; and
a one-half wavelength plate provided on an area corresponding to said transmissive region;
wherein said reflective region has an electrode configuration allowing electrodes to drive liquid crystal molecules with a horizontal electric field generated between said electrodes in said reflective region; and
wherein said electrodes used to generate a horizontal electric field and drive liquid crystal molecules with the horizontal electric field in said reflective region are transparent electrodes and formed in said reflective region.
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Abstract
In a semi-transmissive liquid crystal display device having a reflective region 5 and a transmissive region therein, a one-half wavelength plate 29 is disposed between a lower substrate 11 and a polarizer 21a provided on a side of the lower substrate. This makes liquid crystal molecules in at least the transmissive region 6 driven by a horizontal electric field and allows the device to operate in a normally-black mode in both the reflective region 5 and the transmissive region 6, realizing a semi-transmissive liquid crystal display device having wide viewing angle characteristics.
191 Citations
16 Claims
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1. A semi-transmissive liquid crystal display device comprising:
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a pair of substrates disposed facing each other through a liquid crystal layer and defined as a lower substrate and an opposing substrate;
a plurality of pixel areas provided in one of said pair of substrates, each of said plurality of pixel areas having a reflective region and a transmissive region therein and further having an electrode configuration allowing electrodes to drive liquid crystal molecules with a horizontal electric field generated between said electrodes in said transmissive region; and
a one-half wavelength plate provided on an area corresponding to said transmissive region;
wherein said reflective region has an electrode configuration allowing electrodes to drive liquid crystal molecules with a horizontal electric field generated between said electrodes in said reflective region; and
wherein said electrodes used to generate a horizontal electric field and drive liquid crystal molecules with the horizontal electric field in said reflective region are transparent electrodes and formed in said reflective region. - View Dependent Claims (2, 3, 4, 6, 8, 11, 14, 15, 16)
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5. A semi-transmissive liquid crystal display device comprising:
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a pair of substrates disposed facing each other through a liquid crystal layer and defined as a lower substrate and an opposing substrate;
a plurality of pixel areas provided in one of said pair of substrates, each of said plurality of pixel areas having a reflective region and a transmissive region therein and further having an electrode configuration allowing electrodes to drive liquid crystal molecules with a horizontal electric field generated between said electrodes in said transmissive region; and
a one-half wavelength plate provided on an area corresponding to said transmissive region;
wherein said reflective region has an electrode configuration allowing electrodes to drive liquid crystal molecules with a horizontal electric field generated between said electrodes in said reflective region and wherein said reflective region and said transmissive region have said electrode configuration allowing a common electrode and a pixel electrode to be formed in said reflective region and said transmissive region, respectively.
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7. A semi-transmissive liquid crystal display device comprising:
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a pair of substrates disposed facing each other through a liquid crystal layer and defined as a lower substrate and an opposing substrate;
a plurality of pixel areas provided in one of said pair of substrates, each of said plurality of pixel areas having a reflective region and a transmissive region therein and further having an electrode configuration allowing electrodes to drive liquid crystal molecules with a horizontal electric field generated between said electrodes in said transmissive region; and
a one-half wavelength plate provided on an area corresponding to said transmissive region;
wherein said reflective region has an electrode configuration allowing electrodes to drive liquid crystal molecules with a horizontal electric field generated between said electrodes in said reflective region and further has at least one of a common electrode used to supply a reference potential and a pixel electrode corresponding to a pixel to be displayed, and wherein at least one of a common electrode and a pixel electrode, both formed in said reflective region, is a reflecting electrode, and wherein said common electrode is a reflecting electrode and formed in a level positioned nearer a liquid crystal layer than a data line and wherein said data line is covered through an insulation film with said common electrode formed wider than said data line.
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9. A semi-transmissive liquid crystal display device comprising:
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a pair of substrates disposed facing each other through a liquid crystal layer and defined as a lower substrate and an opposing substrate;
a plurality of pixel areas provided in one of said pair of substrates, each of said plurality of pixel areas having a reflective region and a transmissive region therein and further having an electrode configuration allowing electrodes to drive liquid crystal molecules with a horizontal electric field generated between said electrodes in said transmissive region; and
a one-half wavelength plate provided on an area corresponding to said transmissive region;
wherein said reflective region has an electrode configuration allowing electrodes to drive liquid crystal molecules with a horizontal electric field generated between said electrodes in said reflective region and further has at least one of a common electrode used to supply a reference potential and a pixel electrode corresponding to a pixel to be displayed, and wherein at least one of a common electrode and a pixel electrode, both formed in said reflective region, is a reflecting electrode, and wherein said common electrode is a reflecting electrode and formed in a level positioned nearer a liquid crystal layer than a channel region of a thin film transistor and wherein said channel region is completely covered through an insulation film with said common electrode.
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10. A semi-transmissive liquid crystal display device comprising:
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a pair of substrates disposed facing each other through a liquid crystal layer and defined as a lower substrate and an opposing substrate;
a plurality of pixel areas provided in one of said pair of substrates, each of said plurality of pixel areas having a reflective region and a transmissive region therein and further having an electrode configuration allowing electrodes to drive liquid crystal molecules with a horizontal electric field generated between said electrodes in said transmissive region; and
a one-half wavelength plate provided on an area corresponding to said transmissive region;
wherein said reflective region has an electrode configuration allowing electrodes to drive liquid crystal molecules with a horizontal electric field generated between said electrodes in said reflective region and further has at least one of a common electrode used to supply a reference potential and a pixel electrode corresponding to a pixel to be displayed, and wherein said common electrode is connected to common electrode interconnect line made of an opaque metal through a contact hole in each pixel and wherein said pixel electrode is connected to an auxiliary pixel electrode made of an opaque metal through a contact hole in each pixel. - View Dependent Claims (12, 13)
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Specification