Enhancement of surface anchoring energy in low power consumption transflective liquid crystal displays with three display modes

Liu, Cheng-Kai; Cheng, Kuo-Hsing

doi:10.1016/j.optcom.2018.06.053

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…Regarding the response time of the optimized [7:3]-PDLCs NBA107 , its rise (decay) time was measured to be about 1.5 (193) ms. Compared with other PDLCs, the cause of such low V th and relatively long decay time can be understood because the [7:3]-PDLCs NBA107 possesses relatively weak surface-anchoring [1,20,31,32,33]. A method to shorten the decay time in [7:3]-PDLCs NBA107 will be proposed in Section 4.2.…”

Section: Resultsmentioning

confidence: 99%

Low-Threshold-Voltage and Electrically Switchable Polarization-Selective Scattering Mode Liquid Crystal Light Shutters

Liang

Yang

et al. 2018

Polymers

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Low-threshold-voltage (Vth) and electrically switchable, polarization-selective scattering mode light shutters (PSMLSs) using polymer-dispersed liquid crystals (PDLCs) are demonstrated in this work. The optimized weight ratio of the nematic liquid crystals (LCs) to the adopted monomer (NBA107, Norland Optics) in the low-Vth PDLCs based on NBA107 is 7:3, [7:3]-PDLCsNBA107. The properties of the low-Vth PDLCsNBA107, such as light-scattering performance, initial transmission, Vth, and droplet size were investigated. Experiment results show that the surface anchoring (threshold-voltage) of NBA107 is weaker (lower) than or equal to that of the common NOA65. The cost is that the response time of the proposed PDLCsNBA107 is relatively long. A method to reduce the decay time, which can be applied to all other PDLC devices, will be elucidated. In addition to the low Vth of the proposed PDLCsNBA107, the operation voltage (~6 Vrms) to approach the maximum transmission is relatively low in a 7 μm-thick PDLCsNBA107 cell. Moreover, the polarization-selective light-scattering performances of the proposed PSMLSs based on the [7:3]-PDLCsNBA107, mainly driven by in-plane and vertical fields, are also demonstrated.

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Section: Resultsmentioning

confidence: 99%

Low-Threshold-Voltage and Electrically Switchable Polarization-Selective Scattering Mode Liquid Crystal Light Shutters

Liang

Yang

et al. 2018

Polymers

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“…A commonly introduced TR‐LCD consists of transmittance (T) and reflectance (R) subpixels, and in the T mode the light is produced by a backlight while R mode uses ambient light to readout the displayed images . A major technical challenge of the TR‐LCDs is to compensate the optical path length between the T and R regions, because the light passes only once through the LC layer in the T subpixel but twice through the LC layer in the R subpixel . To achieve the same optical path‐length disparity for the T and R regions, various dual‐cell‐gap approaches have been developed, and these methods exhibit well‐matched VT and VR curves .…”

Section: Introductionmentioning

confidence: 99%

“…2 A major technical challenge of the TR-LCDs is to compensate the optical path length between the T and R regions, because the light passes only once through the LC layer in the T subpixel but twice through the LC layer in the R subpixel. [11][12][13][14][15][16][17][18] To achieve the same optical path-length disparity for the T and R regions, various dual-cell-gap approaches have been developed, and these methods exhibit well-matched VT and VR curves. 19,20 However, technical challenges for fabricating the dualcell-gap devices remain to be overcome.…”

Section: Introductionmentioning

confidence: 99%

Simulation study of single‐cell‐gap transflective liquid crystal display with nonuniform potential

et al. 2019

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A single‐cell‐gap transflective liquid crystal display with a nonuniform electric potential is demonstrated. The top substrate has a top planar common electrode, a transparent dielectric layer with a general dielectric constant is coated on the bottom substrate, and two planar pixel electrodes with the same size are coated on the dielectric layer and the bottom substrate, respectively. With the different gaps between the two planar pixel electrodes and top planar pixel electrode, the nonuniform electric potential from the transmissive region (T region) to the reflective region (R region) is generated, while a bumpy reflector is coated under the bottom substrate. In this device, with the dielectric layer, the pixel and common electrodes generate a strong electric potential in the T region and a relatively weak electric potential in the R region. Consequently, the T and R regions accumulate the same optical phase retardation. The simulation results show that the display exhibits reasonably low operating voltage, high optical efficiency, and well‐matched voltage‐dependent transmittance and reflectance curves. Besides, the fabrication process and the driving mode of the transflective liquid crystal display are relatively simple, and it is suitable for mobile applications.

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A simple transflective liquid crystal display with composite dielectric layer

et al. 2019

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Enhancement of surface anchoring energy in low power consumption transflective liquid crystal displays with three display modes

Cited by 5 publications

References 20 publications

Low-Threshold-Voltage and Electrically Switchable Polarization-Selective Scattering Mode Liquid Crystal Light Shutters

Low-Threshold-Voltage and Electrically Switchable Polarization-Selective Scattering Mode Liquid Crystal Light Shutters

Simulation study of single‐cell‐gap transflective liquid crystal display with nonuniform potential

A simple transflective liquid crystal display with composite dielectric layer

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