Wide-view and sunlight readable transflective liquid-crystal display for mobile applications

Area of Science:

• Materials Science
• Optoelectronics
• Display Technology

Background:

• Transflective Liquid-Crystal Displays (TR-LCDs) are crucial for mobile devices, offering both transmissive and reflective modes.
• Achieving wide viewing angles and high optical efficiency in TR-LCDs remains a challenge.
• Existing designs often require additional components like phase compensation films.

Purpose of the Study:

• To propose a novel wide-view single cell gap TR-LCD.
• To enhance optical efficiency and viewing angles in TR-LCDs.
• To eliminate the need for phase compensation films.

Main Methods:

• Incorporation of a quarter-wave in-cell-retarder in the reflective part of the TR-LCD.
• Optimization of the angle between electrode stripes and LC rubbing direction.
• Utilizing the fringe field switching effect.

Main Results:

• The proposed TR-LCD exhibits high optical efficiency.
• Achieved a good match between voltage-dependent transmittance and reflectance curves.
• Demonstrated a wide viewing cone (60° transmissive, 40° reflective at 10:1 contrast ratio) without phase compensation films.

Conclusions:

• The developed TR-LCD offers superior wide-view performance suitable for mobile displays.
• The in-cell-retarder and optimized electrode design effectively improve display characteristics.
• This approach provides a cost-effective solution by omitting phase compensation films.