US 5,479,188 AGranted

Method for driving liquid crystal display panel, with reduced flicker and with no sticking

AssigneeNEC Corporation

InventorHiroaki Moriyama

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Abstract

In a liquid crystal display driving method, a first and positive voltage and a second and negative voltage are applied for displaying a first brightness level, respectively, and a third and positive voltage and a fourth and negative voltage are applied for displaying a second brightness level, respectively. In each unitary pixel block composed of two rows and two columns, a driving voltage is applied in such a manner that in each of four continuous frames, the first to fourth voltages are always applied to four pixels of the unitary pixel block, but in the four continuous frames, the four voltages are applied to each pixel in the order of the first to fourth voltages but in a phase different from the phase for each of the remaining three pixels. Thus, the four-frame thinning out system can be performed for displaying a halftone, with a minimized flicker.

Claims20

Dependent claims

A method for driving a liquid crystal display comprising a plurality of pixels arranged in a matrix having a plurality of rows and a plurality of columns, the method comprising steps of:

alternately applying, in two continuous frames of each four continuous frames, a first, positive voltage and a second, negative voltage to a pixel for displaying a first brightness;
and
alternately applying, in the remaining two continuous frames, a third, positive voltage and a fourth, negative voltage to the pixel for displaying a second brightness different from said first brightness, so that a halftone between said first brightness and said second brightness is displayed,
wherein, in each unitary pixel block comprising pixels arranged in two rows and in two columns, all of said first to fourth voltages are sequentially applied to each pixel in said four continuous frames such that one voltage is applied in one frame, and said first to fourth voltages are simultaneously applied to four pixels of the unitary pixel block in each frame of said four continuous flames.

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Dependencies are inferred from the claim text.