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 Liquid crystal display device with light shield of specific transmittance

Details
Inventors: Saito, Yuichi; Kadoo, Fumio;
Assignee: Asahi Glass Company Ltd. (Tokyo, JP)
Primary Examiner: Miller; Stanley D.
Assistant Examiner: Pellman; Anita E.
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland & Maier

A liquid crystal display device of negative display type, which comprises a liquid crystal cell comprising a nematic liquid crystal layer sandwiched between substrates provided with electrodes and a light shielding layer covering other than the area corresponding to a display pattern and adapted to apply a voltage sufficient to energize the nematic liquid crystal to the electrodes at a display pattern area other than a desired display pattern, and a pair of polarizing films provided on both sides of the liquid crystal cell with their polarization axes arranged to permit light from a no voltage-applied portion to pass therethrough, wherein the light shielding layer has a light transmittance of not higher than 1.0% and higher than the minimum light transmittance of the display pattern area during the application of the voltage.

DETAILED DESCRIPTION It is an object of the present invention to solve the above-mentioned problem.
The present invention provides a liquid crystal display device of negative display type, which comprises a liquid crystal cell comprising a nematic liquid crystal layer sandwiched between substrates provided with electrodes and a light shielding layer covering other than the area corresponding to a display pattern and adapted to apply a voltage sufficient to energize the nematic liquid crystal to the electrodes at a display pattern area other than a desired display pattern, and a pair of polarizing films provided on both sides of the liquid crystal cell with their polarization axes arranged to permit light from a no voltage-applied portion to pass therethrough, wherein the light shielding layer has a light transmittance of not higher than 1.
0% and higher than the minimum light transmittance of the display pattern area during the application of the voltage.
According to the present invention, a wide range of viewing angle will be ensured without leading to misreading while maintaining a relatively high contrast ratio by adjusting the light transmittance of the light shielding layer to a level of not higher than 1.
0%, particularly from 0.
1 to 1.
0%, and higher than the minimum light transmittance of the display pattern area during the application of the voltage and by operating the display pattern area in the same manner as in the case of a positive display type.



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