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22.2: Frequency Response of Cholesteric LCDs and Its Application in the Driving System *
Author(s) -
Lee DaWei,
Chen ChihJen,
Huang ChiehYi,
Wu ChunMing,
Tsai YiShou,
Lee HsinHung,
Chen KuanTing,
Tsai YuHsiang
Publication year - 2009
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3256768
Subject(s) - frequency response , materials science , voltage , layer (electronics) , volt , adhesion , optoelectronics , low frequency , colored , liquid crystal display , waveform , optics , acoustics , physics , electrical engineering , nanotechnology , composite material , engineering , astronomy
The frequency response of cholesteric liquid crystal display (ChLCD) and its application in the driving system of colored ChLCD were developed. The R‐V curves were shifted 4 volts by 10 Hz ∼ 500 Hz frequency modifications for a ChLCD with no adhesion layer. However, the R‐V curves were shifted 12 volts by 10 Hz ∼ 500 Hz frequency modifications for a ChLCD with the 1.5μm adhesion layer. The shift of the R‐V curves between different frequencies was dependent on the existence of an adhesion layer and the material of substrates. The root cause of such a frequency response was due to the ChLCD structure in which the induced charges were dependent on the frequency of applied voltages. The R‐V curves of different colored ChLCs could be overlapped with each other by utilizing the frequency response. Consequently the new driving waveforms were proposed for the colored ChLCD, and the cost of DC‐DC converters for the scan driver ICs could be reduced 66 % in this proposed driving system.