Optical: systems and elements – Polarization without modulation – Polarizarion by dichroism
Reexamination Certificate
1998-05-27
2001-09-18
Schuberg, Darren (Department: 2872)
Optical: systems and elements
Polarization without modulation
Polarizarion by dichroism
C359S352000, C359S488010, C349S124000
Reexamination Certificate
active
06292296
ABSTRACT:
BACKGROUND OF THE INVENTION
A. Field of the Invention
The present invention relates to a polarizer and a polarizer system, and more particularly, to a large scale polarizer and a polarizer system employing the large scale polarizer.
B. Description of the Related Art
Generally, a liquid crystal display device (LCD) comprises upper and lower substrates placed to face each other with a specific interval farmed by a spacer, and a liquid crystal (LC) layer formed between the upper and lower substrates. The upper and lower substrates respectively have electrodes with specific patterns on their faced sides. And an alignment layer is formed over the electrodes to impart a pretilt angle on the LC.
For aligning the alignment layer, methods such as a rubbing method and a photo-alignment method have been proposed.
The rubbing method comprises depositing an alignment material, such as polyimide (PI), on a substrate and imparting the pretilt on the LC by rubbing the substrate with a rubbing cloth. Using this method, it is possible to make a large scale LCD and to align the alignment layer relatively quickly.
In the above described rubbing process, however, defects are generated by the microgrooves of the alignment layer which cause a light scattering and a random phase distortion. Moreover, dust particles and electrostatic discharge are produced in the alignment layer, so that a thin film transistor of the substrate is damaged and the yield is decreased.
On the other hand, the photo-alignment method imparts the pretilt on the LC by irradiating an ultraviolet light over a substrate having a photo-alignment layer. Compared with the rubbing method, there is no electrostatic discharge or dust particles, and thus the low yield problem is obviated. Moreover, it could control simultaneously the pretilt throughout the alignment layer, and this uniformly arranges the LC molecules. Therefore, there are several advantages, including preventing the random phase distortion or the light scattering from defects generated by the microgrooves.
At this time, to obtain a linearly or a partially polarized ultraviolet light, a polarizer polarizing an incident light from a light source is used. Particularly, the polarizer used in the photo-alignment process require that it be possible to apply in large scale, to use in the ultraviolet light range, and to have high endurance, heat resistance and light-transmittance.
In the conventional polarizer, however, because it is small, it is difficult to apply the polarizer to the photo-alignment process of a large scale LCD. In the case of the polarizer having an absorption mode on which polymers are deposited, the endurance and heat resistance properties are poor, and the wavelength of incident light is limited.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a large scale polarizer with uniformity of the illuminance thereof, for use in a photo-alignment process during fabrication of a large scale LCD.
It is another object of the present invention to provide a polarizer system employing the large scale polarizer having a simplified process and driving system of the polarizer.
Additional objects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims.
To achieve the objects and in accordance with the purpose of the invention, as embodied and broadly described herein, the large scale polarizer of the present invention comprises: a plurality of quartz substrate parts, each quartz substrate part including one or more quartz substrates; and a polarizer holder supporting said plurality of quartz substrate parts.
In another aspect of the invention, the polarizer system employing the large scale polarizer of the present invention comprises: a light source for generating a light; a plurality of quartz substrate parts, each quartz substrate part including one or more quartz substrates; a polarizer holder supporting said plurality of quartz substrate parts; and means for directing said light onto said plurality of quartz substrate parts.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
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Choi Jae Beom
Song Byung Duck
Yoon Ki Hyuk
LG. Philips LCD Co. Ltd.
Long Aldridge & Norman LLP
Schuberg Darren
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