While the liquid crystal displays (LCDs) have become the leading technology in the information display industry, they are facing a number of tough challenges for next generation displays. Most of them have been almost solved through persistent efforts of LCD industry. However, fast response time is ...
While the liquid crystal displays (LCDs) have become the leading technology in the information display industry, they are facing a number of tough challenges for next generation displays. Most of them have been almost solved through persistent efforts of LCD industry. However, fast response time is still remained as an important issue. Recently, the polymer-stabilized blue phase liquid crystals (BPLCs) have been deserved as one of candidate for fulfilling this requirement because of its fast response time under sub-millisecond. However, although the polymer-stabilized BPLCs offer several advantages for LCD applications, high operating voltage and low optical efficiency are still remained as challenges to be overcome. It is required to develop new composite of BPLC with higher Kerr constant so that it enables lower operating voltage. However, it has trade-off relation between higher Kerr constant and other stability parameters. Therefore, design approaches should be researched to achieve lower operating voltage with the given BPLCs. In this paper, we propose the optimal solution by a design approach for the improved electro-optical characteristics by using numerical method. Firstly, before we propose new structure, we simulate the voltage-dependent transmittance characteristics of the conventional IPS and FFS type cells. The result shows that the transmittance efficiency of BPLC cell is determined by the balance of local phase retardation and the IPS type cell which has the better balanced phase retardation is more favorable than the FFS type cell. Thereafter, in order to reduce high operating voltage and overcome low transmittance efficiency of the conventional IPS type cell, we propose new structure driven by new driving scheme using 2 transistors, which has the patterned electrode on the protrusion. As a result, the proposed cell structure exhibits the improved aperture ratio over 95% with the reduction of the operating voltage of less than 25 % as compared to conventional structure. Finally, the proposed electrode shape is fabricated by the patterning of the deposited indium-tin oxide (ITO) film on the protrusion etched by isotropic etching process and compared with the conventional IPS type cell in voltage-dependent transmittance characteristics. The proposed cell shows the lower operation voltage and the higher transmittance efficiency than that of the conventional IPS type cell, however, it exhibits the higher light leakage at the dark state. Therefore, we report the reason of the light leakage by using numerical method and it can be suppressed by the proper combination of the refractive indices of BPLC, ITO, and the protrusion.
While the liquid crystal displays (LCDs) have become the leading technology in the information display industry, they are facing a number of tough challenges for next generation displays. Most of them have been almost solved through persistent efforts of LCD industry. However, fast response time is still remained as an important issue. Recently, the polymer-stabilized blue phase liquid crystals (BPLCs) have been deserved as one of candidate for fulfilling this requirement because of its fast response time under sub-millisecond. However, although the polymer-stabilized BPLCs offer several advantages for LCD applications, high operating voltage and low optical efficiency are still remained as challenges to be overcome. It is required to develop new composite of BPLC with higher Kerr constant so that it enables lower operating voltage. However, it has trade-off relation between higher Kerr constant and other stability parameters. Therefore, design approaches should be researched to achieve lower operating voltage with the given BPLCs. In this paper, we propose the optimal solution by a design approach for the improved electro-optical characteristics by using numerical method. Firstly, before we propose new structure, we simulate the voltage-dependent transmittance characteristics of the conventional IPS and FFS type cells. The result shows that the transmittance efficiency of BPLC cell is determined by the balance of local phase retardation and the IPS type cell which has the better balanced phase retardation is more favorable than the FFS type cell. Thereafter, in order to reduce high operating voltage and overcome low transmittance efficiency of the conventional IPS type cell, we propose new structure driven by new driving scheme using 2 transistors, which has the patterned electrode on the protrusion. As a result, the proposed cell structure exhibits the improved aperture ratio over 95% with the reduction of the operating voltage of less than 25 % as compared to conventional structure. Finally, the proposed electrode shape is fabricated by the patterning of the deposited indium-tin oxide (ITO) film on the protrusion etched by isotropic etching process and compared with the conventional IPS type cell in voltage-dependent transmittance characteristics. The proposed cell shows the lower operation voltage and the higher transmittance efficiency than that of the conventional IPS type cell, however, it exhibits the higher light leakage at the dark state. Therefore, we report the reason of the light leakage by using numerical method and it can be suppressed by the proper combination of the refractive indices of BPLC, ITO, and the protrusion.
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