Display device incorporating brightness control and a method of operating such a display
First Claim
1. A liquid crystal display device comprising:
- a lattice of liquid crystal display elements, each element selectively settable between two states, one state allowing the passage of light therethrough and the other state inhibiting the passage of light therethrough;
data input means arranged for supplying data to the lattice;
lattice setting means for setting all the elements in the lattice into either of the two states in dependence upon a significance-weighted portion of the supplied data;
lighting means for lighting the lattice subsequent to the setting of all the elements therein;
and control means for controlling the amount of light passing through the lattice for said setting in accordance with the binary significance of said portion of the supplied data.
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Accused Products
Abstract
A display device is formed by a matrix of surface-stabilized bi-stable ferroelectric liquid crystal elements each being separately settable by a matrix driver. To provide brightness control or color in the display, all the elements of the matrix are set in accordance with a portion of a signal for display and the amount of light passing through the matrix for that setting is controlled in accordance with the binary significance of the respective portion of the signal. This control is produced by varying one of the activation duration or intensity of a light source, such as sets of fluorescent tubes in accordance with the binary significance of the brightness information in the input signal. Half of the frame time (T) is used for the numerous setting operations on the matrix of elements and half is used for the backlighting operations of the various settings.
207 Citations
10 Claims
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1. A liquid crystal display device comprising:
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a lattice of liquid crystal display elements, each element selectively settable between two states, one state allowing the passage of light therethrough and the other state inhibiting the passage of light therethrough; data input means arranged for supplying data to the lattice; lattice setting means for setting all the elements in the lattice into either of the two states in dependence upon a significance-weighted portion of the supplied data; lighting means for lighting the lattice subsequent to the setting of all the elements therein; and control means for controlling the amount of light passing through the lattice for said setting in accordance with the binary significance of said portion of the supplied data. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a liquid crystal display device comprising a lattice of liquid crystal display elements, each element selectively settable between two states, one state allowing the passage of light therethrough and the other state inhibiting the passage of light therethrough, the method comprising:
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supplying data to the lattice; setting all the elements in the lattice into either of the two states in dependence upon significance-weighted portion of the supplied data; lighting the lattice subsequent to the setting of all the elements therein; and controlling the amount of light passing through the lattice for said setting in accordance with the binary significance of said portion of the supplied data. - View Dependent Claims (9, 10)
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Specification