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Liquid crystal display
| Details |
Inventors: Kano, Mitsuru; Miyagawa, Kenji; Yamaguchi, Masahiko; Imaizumi, Eiji;
Assignee: Alps Electric Co., Ltd. (Tokyo, JP)
Primary Examiner: Miller; Stanley D.
Assistant Examiner: Mai; Huy K.
Attorney, Agent or Firm: Shoup; Guy W., Winters; Paul J.
A liquid crystal display includes a pair of substrates and a liquid crystal composition sealed between the substrates. The liquid crystal composition has a twist angle set within a range of 180-300 degrees and a retardation set within a range of 0.45-0.7, wherein when an electric field is applied, the liquid crystal display is in a dark state, while when the electric field is not applied, the liquid crystal display is in a bright state. A filter is laminated on the outside of the substrates, and it has a hue complementary to that of an image color of the liquid crystal display in the bright state. |
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DETAILED DESCRIPTION Accordingly, it is a first object of the present invention to provide a liquid crystal display which may basically exhibit positive mode images and simultaneously realize clear black-white images and high density of the images.
It is a second object of the present invention to provide a liquid crystal display which may attain bright images and eliminate the possibility of the deposition of the coloring matter.
It is a third object of the present invention to provide a liquid crystal display which is improved in visual angle characteristics and may be manufactured at a low cost.
The liquid crystal display of the present invention is constituted basically of the OMI mode liquid crystal display, and a filter is laminated on the OMI mode liquid crystal display.
The filter has a hue complementary to that in a bright or off state of the liquid crystal display.
According to the present invention, in order to improve a .
gamma.
characteristic indicative of an index of high information density and a contrast, various parameters such as retardation, twist angle of liquid crystal molecules, configuration of polarizing plate, d/p and material constant are set to optimum values in the basic OMI mode.
The .
gamma.
characteristic is represented by .
gamma.
=V.
sub.
90 /V.
sub.
10 (where V.
sub.
90 and V.
sub.
10 stand for applied voltages when light transmittances are 90% and 10%, respectively).
In setting the parameters of the liquid crystal display primarily from the viewpoints of the .
gamma.
characteristic and the contrast, the twist angle of the liquid crystal molecules is set to a proper value within a range of 180-300 degrees, and the retardation is set to a proper value within a range of 0.
45-0.
7.
The OMI liquid crystal display obtained in this stage normally exhibits colored images of blue-green close to white in the region where no electric field is applied.
According to the present invention, a filter is laminated on the OMI liquid crystal display.
The filter to be used has a hue complementary to that of the image color in the off state of the OMI liquid crystal display, that is, in the region where no electric field is applied, in consideration of spectral characteristics of the image color in the off state
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Optical Systems 
