| Summary: | 碩士 === 南台科技大學 === 光電工程系 === 100 === Power saving is one of the important topics of display technology , reflective liquid crystal displays use the ambient light without the backlight, so has the advantages of low power consumption. Bi-stable cholesteric liquid crystal display is a reflective image and memory characteristics, to keep the last picture on the display when the power off, so low power consumption, with the potential applied to the e-book.
Using Continuous Air-Extracting cell filling technique in our study, to injected R, G , B cholesteric liquid crystal on the same substrate, characteristic is by using a UV glue framed the R, G ,B independent cell, R, G, B three colors can be displayed simultaneously. The substrate with the ITO glass substrate and ITO / PET plastic substrate in experiments, observation bubble residues between the two cell, changing the cell pressure and temperature, to observe the injection speed for Ch-LCD, and use the different height of the spacer observed optical and electrical properties in the cell.
Results showed that using Continuous Air-Extracting cell filling technique to the R, G, B cholesteric liquid crystal is injected into the same substrate and independent of the cell within a cell pressure reduction and increase of cell temperature, able to increase the liquid crystal injection speed , in the ITO glass substrate, cell temperature is 70 ℃ than cell temperature is 25 ℃ ,the average injection speed is 25 ℃ 2.5 times, in ITO / PET substrate, cell temperature 90 ℃,than cell temperature is 25 ℃, the average injection speed is 6 times. At any temperature, the ITO glass substrate liquid crystal injection speed are good at PET plastic substrate, in the cell temperature of 70℃, the glass cell injection speed of 10 mm / s, and the PET cell is 1.31mm / s, the reason for the PET substrate is softer cell, internal and external pressure differential caused by the cell gap deformation, so that the cell flow impedance change, which will reduce the flow rate of the Ch-LC.
The optical and electrical properties of Ch-LC cell, the reflectivity of R, G, B Ch-LC, and the cell gap relationship ,when thecell gap of R, G, B Ch-LC increased from 3um to 5um, reflectivity will increase about 20%. And the greater the cell gap, but also requires larger drive voltage , in the cell gap is 5um, drive voltage is 44V, let the Ch-LC cell with a lower luminance, as the cell gap increase from 2um to 5um, contrast ratio can increase 1.7.
Results show we have achieved the desired objectives, In flexible cholesteric liquid crystal display technology, developed the use of single-layer structure and a simple cell filling technology can let the three color cholesteric liquid crystal fill into the same substrate, the cell gap is not reached in this study for best effect, in the future must improvement for the cell gap.
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