Method of determining the pretilt angle of liquid crystal...

Details Method of determining the pretilt angle of liquid crystal... Method of determining the pretilt angle of liquid crystal...

G - Physics

01

N

73/54

G01N 21/84 (2006.01) G01M 11/02 (2006.01) G01N 21/59 (2006.01) G02F 1/13 (2006.01) G02F 1/1337 (2006.01)

Patent

CA 2039788

The invention concerns a method of determining the angle of attack (pretilt angle) of liquid crystal molecules in a liquid crystal display (LCD) provided with top and bottom cover plates. The following steps are proposed for a simple and cheap determination: addition of a dichroic dye (17) to the liquid crystal in order to cause the dye molecules to become aligned by the crystal molecules, which are present in a twist-free state, determination by measurement of a maximum absorption value, the said measurement being carried out by causing a polarized ray of light (measuring ray) to pass through the liquid crystal display and varying its angle of inclination (.alpha.) with respect to the plane of the cover plates and then using the angle of inclination (.alpha.) associated with the maximum absorption for determining the angle of attack (?).

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