Scanning and driving method of two phases of line and column of smectic state liquid crystal display

Abstract

The invention discloses a scanning and driving method of two phases of line and column of a smectic state liquid crystal display. The method comprises a line scanning step and a column scanning step. A high-frequency unidirectional pulse applied in the line scanning step and the column scanning step respectively should be a positive or negative pulse simultaneously and needs to satisfy a following formula: Dh*Th*Qh* (M-1)=Dv*Tv*Qv* (N-1), wherein the Dh, the Th, and the Qh are a period, a duty ratio and the number of the pulse of the high-frequency unidirectional pulse in the line scanning step respectively, the Dv, the Tv and the Qv are the period, the duty ratio and the number of the pulse of the high-frequency unidirectional pulse in the column scanning step respectively, the M and theN are line and column number of the display screen respectively. According to the invention, a two-phase line and column scanning and driving mode is adopted. On a basis of unidirectional voltage waveform driving, DC equilibrium of a whole display period can be guaranteed, and normal display of an image can be guaranteed. It is simple to realize the unidirectional voltage waveform and driving difficulty is low.

Description

technical field [0001] The invention relates to a scanning driving method of a smectic liquid crystal display, in particular to a row and column two-stage scanning driving method of a smectic liquid crystal display. Background technique [0002] Currently, smectic liquid crystal displays use high-frequency high-voltage positive and negative pulses as voltage waveforms for driving row and column electrodes. For example, the high-frequency high-voltage positive and negative pulses can be composed of figure 1 The shown waveform form is realized by the positive and negative pulse pairs composed of positive pulse and negative pulse. The waveform is powered by positive and negative power supplies, and the voltage amplitude is Um. Two sets of high-voltage isolation devices are needed to realize the waveform. The realization of the waveform is complicated and the driving is difficult. It costs a lot. If high-frequency high-voltage positive and negative pulses with different voltag...

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Problems solved by technology

For example, the high-frequency high-voltage positive and negative pulses can be composed of figure 1 The shown waveform form is realized by the positive and negative pulse pairs composed of positive pulse and negative pulse. The waveform is powered by positive and negative power supplies, and the voltage amplitude is Um. Two sets of high-voltage isolation devices are needed to realize the waveform. The realization of the waveform is complicated and the driving is difficult. cost more

If high-frequency high-voltage positive and negative pulses with different voltage amplitudes are applied to the row and column electrodes, four sets of high-voltage isolation devices are required to realize the realization, which increases the complexity of waveform realization, increases the difficulty of driving, and improves cost

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