Liquid crystal display device with improved viewing angle property and portable electronic apparatus using the same
AssigneeAlps Electric Co., Ltd.
InventorsKatsumasa Yoshii, Tatsuya Moriike, Mitsuru Kano
Life of this patent
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Abstract
A liquid crystal display device includes a reflector disposed at an outside surface side of one substrate of a liquid crystal cell or between the first substrate and an electrode disposed on an inside surface side of the first substrate. When an angle between a direction of a normal line with respect to a display surface of the liquid crystal display device and a main viewing direction is from about 0 degrees to about 20 degrees, a reflection ratio peak value of light incident upon the liquid crystal display device and reflected by the reflector is set so as to occur within a range of about 20 degrees from the normal line direction.
Claims29
A liquid crystal display device comprising:
- a liquid crystal cell including a first transparent substrate, a second transparent substrate, a first electrode disposed on an inside surface side of the first substrate, and a first alignment film disposed on an opposite side of the first electrode as a side opposing the first transparent substrate, a second electrode disposed on an inside surface side of the second substrate, and a second alignment film disposed on an opposite side of the second electrode as a side opposing the second substrate, and a liquid crystal layer sandwiched between the first substrate and the second substrate;
- a reflector disposed one of at an outside surface side of the first transparent substrate and between the first transparent substrate and the first electrode;
- and
- a retardation plate and a polarizing plate disposed in that order from an outside surface side of the second substrate,
- wherein, when an angle between a direction of a normal line with respect to a display surface of the liquid crystal display device and a main viewing direction is from about 0 degrees to about 20 degrees, a reflection ratio peak value of light incident upon the liquid crystal display device and reflected by the reflector is set so as to occur within a range of about 30 degrees from the normal line direction.
A liquid crystal display device comprising:
- a liquid crystal cell including a first transparent substrate, a second transparent substrate, a first electrode disposed on an inside surface side of the first substrate, and a first alignment film disposed on an opposite side of the first electrode as a side opposing the first transparent substrate, a second electrode disposed on an inside surface side of the second substrate, and a second alignment film disposed on an opposite side of the second electrode as a side opposing the second substrate, and a liquid crystal layer sandwiched between the first substrate and the second substrate;
- a reflector disposed one of at an outside surface side of the first substrate and between the first substrate and the first electrode;
- and
- a retardation plate and a polarizing plate disposed in that order from at an outside surface side of the second substrate, wherein, when an angle between a direction of a normal line with respect to a display surface of the liquid crystal display device and a main viewing direction is from about 0 degrees to about 20 degrees, a reflection ratio peak value of light incident upon the liquid crystal display device and reflected by the reflector is set so as to occur within a range of angles less than about 30 degrees from the normal line direction.
A method of improving viewing of a liquid crystal display device having a reflector and a display surface, the method comprising setting a reflection ratio peak value of light incident upon the liquid crystal display device and reflected by the reflector to occur within a range of less than about 20 degrees from a direction of a normal line with respect to the display surface when an angle between the normal line direction and a main viewing direction of the display surface is about 0 degrees to about 20 degrees;
- and broadening the reflection ratio peak value to be substantially constant over a range of not less than about 10 degrees.
Dependencies are inferred from the claim text.