Reflective dual-mode liquid crystal display possessing low power consumption and high contrast ratio under ambient light

Kim, Tae-Hyung; Lee, Joong Ha; Yoon, Tae–Hoon; Choi, Suk–Won

doi:10.1364/oe.20.015522

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…Healthy eye-care display is becoming more and more important as individuals strive to live healthier lifestyles. More and more research is being done on RLCDs that eliminate backlight and use ambient light as the source of light because the blue band in LCD backlights is bad for human eyes [1][2][3][4][5][6][7][8][9] . The reflective metal in conventional RLCD cell serves as the reflective surface for RLCD, which typically modulates the light using 1/2λ and 1/4λ plate [1, 2 and 11] .…”

Section: Introductionmentioning

confidence: 99%

87‐2: Study on Optical Performances of New Structure Reflective Liquid Crystal Display with Advanced Polarizer Film^†

Wang,

Wu,

Chen

et al. 2023

Symp Digest of Tech Papers

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Reflective liquid crystal displays (RLCDs), which use ambient light as their light source, have been extensively explored as people pay more attention to eye care displays. In this work, a novel variety of normal white mode RLCD with improved high contrast ratio (CR) performance is studied. The reflection function is achieved by cleverly designing the angle of the advanced polarizer film (APF). The CR of the RLCD is enhanced by over 90% when compared to the conventional metal RLCD, significantly enhancing its performance. The study demonstrates that by adjusting the angle of polarizer PVA, Chroma can be optimized and adjusted. The new RLCD's customizable Chroma on bright state makes it suited for a variety of application scenarios. The results show that the new RLCD has a high CR, a flexible Chroma design, and a wide range of application scenarios.

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Section: Introductionmentioning

confidence: 99%

87‐2: Study on Optical Performances of New Structure Reflective Liquid Crystal Display with Advanced Polarizer Film^†

Wang,

Wu,

Chen

et al. 2023

Symp Digest of Tech Papers

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“…With the widespread use of liquid crystal display (LCD) in mobile phones, computers, and televisions, this technology is continuously undergoing improvement to achieve low power consumption, fast response, wide viewing angle, and high contrast [ 1 , 2 , 3 , 4 , 5 ]. Consequently, high image quality in thin film transistor-liquid crystal display (TFT-LCD) has several requirements.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Image Quality in LCD by Doping γ-Fe2O3 Nanoparticles and Reducing Friction Torque Difference

Gao

Dai

et al. 2018

Nanomaterials

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Improving image sticking in liquid crystal display (LCD) has attracted tremendous interest because of its potential to enhance the quality of the display image. Here, we proposed a method to evaluate the residual direct current (DC) voltage by varying liquid crystal (LC) cell capacitance under the combined action of alternating current (AC) and DC signals. This method was then used to study the improvement of image sticking by doping γ-Fe2O3 nanoparticles into LC materials and adjusting the friction torque difference of the upper and lower substrates. Detailed analysis and comparison of residual characteristics for LC materials with different doping concentrations revealed that the LC material, added with 0.02 wt% γ-Fe2O3 nanoparticles, can absorb the majority of free ions stably, thereby reducing the residual DC voltage and extending the time to reach the saturated state. The physical properties of the LC materials were enhanced by the addition of a small amount of nanoparticles and the response time of doping 0.02 wt% γ-Fe2O3 nanoparticles was about 10% faster than that of pure LC. Furthermore, the lower absolute value of the friction torque difference between the upper and lower substrates contributed to the reduction of the residual DC voltage induced by ion adsorption in the LC cell under the same conditions. To promote the image quality of different display frames in the switching process, we added small amounts of the nanoparticles to the LC materials and controlled friction technology accurately to ensure the same torque. Both approaches were proven to be highly feasible.

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“…Liquid crystal display (LCD) devices are one of the most popular flat panel displays, which have many excellent characteristics, such as high resolution, small size, light weight, and low power consumption [1] . They are widely used in mobile phones, computers, televisions [2] , public information display [3] , and holographic projection display technology [4,5] .…”

mentioning

confidence: 99%

Influence of γ-Fe2O3 nanoparticles doping on the image sticking in VAN-LCD

et al. 2020

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Image sticking in liquid crystal display (LCD) is related to the residual direct current (DC) voltage (RDCV) on the cell and the dynamic response of the liquid crystal materials. According to the capacitance change of the liquid crystal cell under the DC bias, the saturated RDCV (SRDCV) can be obtained. The response time can be obtained by testing the optical dynamic response of the liquid crystal cell, thereby evaluating the image sticking problem. Based on this, the image sticking of vertical aligned nematic (VAN) LCD (VAN-LCD) with different cell thicknesses (3.8 μm and 11.5 μm) and different concentrations of γ-Fe 2 O 3 nanoparticles (0.017 wt.%, 0.034 wt.%, 0.051 wt.%, 0.068 wt.%, 0.136 wt.%, 0.204 wt.%, and 0.272 wt.%) was evaluated, and the effect of nano-doping was analyzed. It is found that the SRDCV and response time decrease firstly and then increase with the increase of the doping concentration of γ-Fe 2 O 3 nanoparticles in the VAN cell. When the doping concentration is 0.034 wt.%, the γ-Fe 2 O 3 nanoparticles can adsorb most of the free impurity ions in liquid crystal materials, resulting in 70% reduction in the SRDCV, 8.11% decrease in the decay time, and 15.49% reduction in the rise time. The results show that the doping of γ-Fe 2 O 3 nanoparticles can effectively improve the image sticking of VAN-LCD and provide useful guidance for improving the display quality.

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Reflective dual-mode liquid crystal display possessing low power consumption and high contrast ratio under ambient light

Cited by 9 publications

References 18 publications

87‐2: Study on Optical Performances of New Structure Reflective Liquid Crystal Display with Advanced Polarizer Film^†

87‐2: Study on Optical Performances of New Structure Reflective Liquid Crystal Display with Advanced Polarizer Film^†

Enhancement of Image Quality in LCD by Doping γ-Fe2O3 Nanoparticles and Reducing Friction Torque Difference

Influence of γ-Fe2O3 nanoparticles doping on the image sticking in VAN-LCD

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Reflective dual-mode liquid crystal display possessing low power consumption and high contrast ratio under ambient light

Cited by 9 publications

References 18 publications

87‐2: Study on Optical Performances of New Structure Reflective Liquid Crystal Display with Advanced Polarizer Film†

87‐2: Study on Optical Performances of New Structure Reflective Liquid Crystal Display with Advanced Polarizer Film†

Enhancement of Image Quality in LCD by Doping γ-Fe2O3 Nanoparticles and Reducing Friction Torque Difference

Influence of γ-Fe2O3 nanoparticles doping on the image sticking in VAN-LCD

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87‐2: Study on Optical Performances of New Structure Reflective Liquid Crystal Display with Advanced Polarizer Film^†

87‐2: Study on Optical Performances of New Structure Reflective Liquid Crystal Display with Advanced Polarizer Film^†