| 摘要 |
A window ( 1 ) comprising a window pane ( 3 ) is provided with a visual display panel ( 5 ) laminated to the window ( 1 ). The visual display panel ( 5 ) comprises a cholesteric liquid crystal medium ( 15 ) sandwiched between inner and outer substrates ( 11,12 ) which are patterned with row and column electrodes ( 18,19 ) for defining individual pixels ( 8 ) which are individually addressable for displaying information on the panel ( 5 ). Inner and outer protective panels ( 9,10 ) sandwich the inner and outer substrates ( 11,12 ) and the liquid crystal medium ( 15 ) therebetween. An ultraviolet film filter ( 16 ) is located between the outer protective panel ( 10 ) and the outer substrate ( 11 ). The outer panel ( 10 ) is bonded to the window pane ( 3 ). The protective panels ( 9,10 ), the substrates ( 11,12 ) and the film filter ( 16 ) are all of transparent material. The pixels ( 8 ) are operable in a light transmitting state when powered up, and in a light scattering state when powered down. Letters and numerals to display the information are formed by operating appropriate selected ones of the pixels ( 8 ) in the light scattering state. The remaining pixels ( 8 ) which form the background of the visual display panel ( 5 ) are operated in the light transmitting state. Accordingly, the panel facilitates the display of information on a shop window with minimum impairment to viewing of goods and other items in the shop window behind the panel ( 5 ) by the viewing public.
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