Off-axis viewing angle control technology applied to displays

With the development of display technology and the expansion of application fields, such as vehicle/airborne displays, medical imaging displays, industrial control displays, etc., spatial constraints of these displays often result in viewers observing them at specific off-axis viewing angles. Therefore, the frequently using demands of off-axis viewing angles lead to increasing requirements for the viewing angle performance of displays. A method to enhance the off-axis viewing angle effect is proposed in this paper by attaching a designed liquid crystal cell on the surface of the display to control the emission direction. When an appropriate driving voltage is applied to the liquid crystal cell, the liquid crystal molecules align in a specific periodic arrangement, creating an optical effect similar to micro/nano structured light control devices. Different driving voltages induce distinct modulations of light within the liquid crystal layer. When no driving voltage is applied, the frontal viewing angle effect of the display is optimal, suitable for vertical viewing by a single individual, as an on-axis viewing mode. When a driving voltage is applied, certain off-axis viewing angle properties such as brightness is increased and colour shift is reduced, making it suitable as an off-axis viewing mode. In practical use, individuals can freely switch between these two display modes based on their actual needs. [GRAPHICS]