G - Physics – 02 – F
Patent
G - Physics
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F
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G02F 1/33 (2006.01) G02F 1/139 (2006.01) G09G 3/36 (2006.01)
Patent
CA 1243101
18 ABSTRACT: A liquid crystal display device comprises two supporting plates which are kept spaced apart and the facing surfaces of which comprise a pattern of line elec- trodes and column electrodes, respectively, which form a matrix of display cells. A mixture of a nematic liquid crystal with a cholesteric addition is present between the supporting plates. The mixture has a positive dielectric anisotropy and a natural pitch p such that the ratio d/p has a value between 0.6 and 0.9. The surfaces comprise an orientation layer to provide a progressive molecular twist ? the liquid crystal molecules (director) across the layer thickness a of greater than 1.2 .pi. and less than 1.7.pi. radians, the director assuming an angle of tilt between 0° and 7° at one surface and an angle of tilt between 5° and 70° at the other surface. Below a field strength E1 the display cells are in a first stable state and above a field strength E2 they are in a second state differing optically therefrom. At a field strength EH between E1 and E2 both states may co-exist. Starting from the first state and a field strength EH across the display cells, the liquid crystal material shows a small energy threshold in such manner that a cell can be switched from the first stable state to the second by means of a pulsatory field having an energy content above the energy threshold. With a pulsatory field having an energy content below the energy threshold, the cell returns to the initial state viaa metastable state having a certain relaxation period. When the recurrence frequency with which a picture cell is driven does not exceed the reciprocal value of the relax- ation period, more than 2,000 lines can be successively written in this manner within one second.
474827
de Vaan Adrianus J.s.m.
Van Sprang Hendrik A.
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
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