Cholesteric liquid crystal display device and method for driving the same

A cholesteric liquid crystal display device, comprising:

• a liquid crystal display panel, comprising:
• a first substrate on which a plurality of first electrodes extending in a first direction are formed;
• a second substrate on which a plurality of second electrodes extending in a second direction different from the first direction are formed;
• a cholesteric liquid crystal layer formed between the first substrate and the second substrate;
• and
• a driving circuit section, configured to apply a plurality of alternating-current (AC) voltage pulses to pixel circuits at intersections between the first electrodes and the second electrodes,
• wherein a pulse-width modulation (PWM) scanning procedure of the pixel circuits on an activated first electrode comprises a first stage and a second stage,
• wherein the first stage is configured to manipulate grayscale values of the pixel circuits on the activated first electrode to be written in the second stage.

A method for driving a cholesteric liquid crystal display device, the cholesteric liquid crystal display device comprising a display panel and a driving circuit section, wherein the display panel comprises a plurality of scanning electrodes and a plurality of data electrodes, the method comprising:

• utilizing the driving circuit section to sequentially activate each scanning electrode within the display panel;
• utilizing the driving circuit section to apply one or more first alternating-current (AC) voltage pulses to pixel circuits on an activated scanning electrode during a first stage within a pulse-width modulation (PWM) scanning procedure of an activated scanning electrode;
• and
• utilizing the driving circuit section to apply one or more second AC voltage pulses to the pixel circuits on the activated scanning electrode during a second stage of the PWM scanning procedure,
• wherein a first voltage amplitude and a first frequency of the one or more first AC voltage pulses are different from a second voltage amplitude and a second frequency of the one or more second AC voltage pulses, respectively.