Scanning drive method for smectic phase liquid crystal display

Abstract

The invention discloses a scanning drive method for a smectic phase liquid crystal display, to perform scanning drive for all lines. The scanning drive for each line comprises the following steps: applying 0V voltage to all lines and columns in a waiting period; in a scanning period, applying a line scanning period pulse on a line to be subjected to scanning drive, and applying 0V voltage to other lines not to be subjected to scanning drive, applying full-transparent state column scanning period pulse to a column corresponding to pixel points which are on the line to be subjected to scanning drive and need to be driven into a full-transparent state, and applying fog light shielding state column scanning period pulse to a column corresponding to pixel points which are on the line to be subjected to scanning drive and need to maintain a fog light shielding state; and in a DC balance period, applying positive voltage with amplitude value being Um to other lines not to be subjected to scanning drive and applying 0V voltage to the line to be subjected to scanning drive and all columns. According to the invention, the voltage waveform can be achieved simply, the problem that the drive voltage of a column electrode is slightly higher is solved, the influence of screen refreshing accumulative effect is reduced, the drive cost and the complexity are lowered, and the DC balance and normal image display are guaranteed.

Description

technical field [0001] The invention relates to a scanning driving method, in particular to a scanning driving method applied to a smectic liquid crystal display. Background technique [0002] At present, smectic liquid crystal displays (also called smectic liquid crystal displays) generally 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 waveform form realized by the positive and negative pulse pairs composed of the positive pulse and the negative pulse is shown. The positive and negative pulses in the high-frequency high-voltage positive and negative pulses are symmetrical to each other, and the voltage amplitudes are equal, both of which are Umx. [0003] In actual implementation, it can be found that since the smectic liquid crystal display has a threshold voltage, therefore, in order to drive...

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Problems solved by technology

[0004] However, since the values ​​of the voltage waveforms on the row and column electrodes of the current smectic liquid crystal display are fixed, that is, they are all high-frequency high-voltage positive and negative pulses with a voltage amplitude of Umx, therefore, the voltage amplitude Umx must be set to be The voltage energy required to drive the highest energy state (i.e. fully transparent state)

[0005] It can be seen that the current high-frequency high-voltage positive and negative pulses used by smectic liquid crystal display screens have caused the problems of overall high voltage amplitude and waste of voltage energy, and the overall high voltage amplitude will also lead to the cumulative effect of screen brushing. aggravate

[0006] In addition, the current high-frequency high-voltage positive and negative pulses used on the row and column electrodes of the smectic liquid crystal display are powered by positive and negative power supplies, which require two sets of high-voltage isolation devices to realize, the waveform is complex to realize, the drive is difficult, and the cost is high.

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