Display device and method for driving a cholesteric liquid-crystal display device

The PWM scanning program with additional voltage pulses in ChLC displays accelerates pixel transitions and improves contrast, addressing the need for efficient state transitions and high contrast in ChLC displays.

TW202630101APending Publication Date: 2026-07-16IRIS OPTRONICS INC
0 Cites 0 Cited by

Patent Information

Application Number
TW114140648
Authority / Receiving Office
TW · TW
Patent Type
Applications
Current Assignee / Owner
Priority Date
2025-09-29
Filing Date
2025-10-21
Publication Date
2026-07-16

AI Technical Summary

Technical Problem

Cholesteric liquid crystal displays (ChLC) require efficient driving methods to rapidly transition between stable states for quick image updates while maintaining high contrast and reduced power consumption.

Method used

A pulse width modulation (PWM) scanning program with additional voltage pulses applied to the negative and positive half-cycles of the common AC voltage pulse to accelerate pixel writing and improve contrast in ChLC displays.

Benefits of technology

The proposed method enhances pixel writing speed and achieves a higher bright pixel value with improved contrast, increasing the overall contrast ratio by approximately 5% to 10% compared to conventional PWM scanning programs.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

A method for driving a cholesteric liquid-crystal display device is provided. The cholesteric liquid-crystal display device includes a cholesteric liquid-crystal display panel and a driving circuit section. The cholesteric liquid-crystal display panel includes a plurality of scanning electrodes and a plurality of data electrodes. The method includes the following steps: utilizing the driving circuit section to sequentially activate each of the scanning electrodes using a pulse-width modulation (PWM) scanning procedure, which comprises a selection stage and a non-selection stage; and during the selection stage of each pixel circuit on an activated scanning electrode among the plurality of scanning electrodes, utilizing the driving circuit section to add one or more first additional voltage pulses and one or more second additional voltage pulses to a negative half cycle and a positive half cycle of a common AC voltage pulse applied to each pixel circuit on the activated scanning electrode, respectively.
Need to check novelty before this filing date? Find Prior Art