Liquid crystal display
AssigneeKabushiki Kaisha Toshiba
InventorMasahiko Akiyama
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Abstract
A liquid crystal display apparatus includes systems of voltage applying devices for applying voltages to a liquid crystal and a controlling device for switching among these systems. The systems of voltage applying devices each have at least one non-linear switching element, and the controlling device has a memory portion for storing the switched state. With such a construction, electric power loss caused by one signal line having a relatively high frequency can be avoided by using another signal line having a relatively low frequency, thereby allowing a white, black, or gradation display with reduced power consumption.
Claims24
A liquid crystal display apparatus, comprising:
- first voltage applying means for applying a first voltage at a first frequency to a liquid crystal, the first voltage applying means having at least one non-linear switching element and intersecting a scanning line so as to form a matrix,
- second voltage applying means for applying a second voltage at a second frequency to the liquid crystal, the second voltage applying means having at least one non-linear switching element and the second frequency being lower than the first frequency, and
- controlling means for switching the voltage applying means alternately, said controlling means having a memory portion for storing a switched state for switching between a sampling state and a selected state, wherein
- the sampling state samples the first voltage at a sampling timing and consequently applies a sampling voltage corresponding to the first voltage to the liquid crystal, and
- the selected state selects the second voltage.
A liquid crystal display apparatus, comprising:
- a plurality of pixel electrodes disposed in a plurality of pixels arranged in a matrix form, each pixel having a first circuit, a second circuit and a memory portion,
- a plurality of first signal lines to apply a voltage to the pixel electrodes,
- a plurality of second signal lines to apply a voltage to the pixel electrodes, and
- a plurality of scanning lines intersecting the first signal lines, wherein
- the first circuit samples a voltage applied to the first signal line corresponding to a voltage applied to the scanning line and applies the sampled voltage to the pixel electrode,
- the second circuit is connected to the second signal line and the memory portion, selects a voltage applied to the second signal line and applies the selected voltage to the pixel electrode, and
- the memory portion stores a switched state by a signal supplied from the first circuit and switches alternately between a sampling state and a selected state.
Dependencies are inferred from the claim text.