Optimized Design of Variable Viewing Angle Display Using Design of Experiment

실험계획법을 이용한 시야각 변환 디스플레이의 최적 설계

  • Park, Ki-Jong (Department of Electronic Engineering, Inha University) ;
  • Kim, Tae-Hyeon (Department of Electronic Engineering, Inha University) ;
  • Park, Woo-Sang (Department of Electronic Engineering, Inha University)
  • 박기종 (인하대학교 전자공학과) ;
  • 김태현 (인하대학교 전자공학과) ;
  • 박우상 (인하대학교 전자공학과)
  • Received : 2018.12.11
  • Accepted : 2018.12.28
  • Published : 2019.03.01


Non-emissive LCDs need a backlight, and have difficulty implementing wide viewing angles due to differences in phase retardation depending on the behavior of the liquid crystals. Although wide viewing angles are good characteristics for devices such as TVs, they are not good for mobile devices. In this paper, we propose ways to design diffusers with ELC lenses to achieve wide and narrow viewing angles depending on the circumstances. A study was conducted on optimizing the design of a liquid lens diffuser with the same light as that for an OLED, by extracting design factors that affect the performance of the diffuser and applying the Taguchi method to them.

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Fig. 1. Schematic diagram for narrow viewing angle and wide viewing angle.

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Fig. 2. The structure of ELC lens.

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Fig. 3. Main effects plot of S/N ratio.

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Fig. 4. Phase retardation distribution of ELC diffuser and ideal diffuser.

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Fig. 5. Normalized luminance for viewing angle (a) OLED, (b) wide viewing angle mode, (c) conventional LCD, and (d) narrow viewing angle mode.

Table 1. Factor and factor level.

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Table 2. Orthogonal array table of L18(21 × 35) .

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Table 3. Condition of experiment and measurement data.

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Table 4. Optimum conditions of experiments.

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