A controllable viewing angle optical film using micro prisms filled with liquid crystal

P‐13.3: Design and preparation of an optical micro‐nano film with adjustable viewing angle effect

“…When the driving voltage is 15V, influenced by the pointing vectors of liquid crystal molecules，the effective refractive index at the boundary of the liquid crystal layer is close to ne, while the center part is approximately equal to no, the refractive index of the liquid crystal layer has a polygonal distribution. In order to further study the angle adjustment effect of optical micro-nano films, the finite-difference time-domain (FDTD) method is introduced to simulate the vertically incident light waves [9][10]. In this paper, the green light wave, which is more sensitive to human eyes, is selected and the wavelength is 550 nm.…”

A Light-Mixing Liquid Crystal Lens-Like Cell to Decrease Color Shift and Tune Brightness for Displays

“…Moreover, the ultra-high-definition display is the development trend of display areas nowadays [3][4][5][6], but the black matrix of highresolution displays aggravates the off-axis angle color shift and brightness loss to some extent. Some researchers have contributed to this issue; a multidomain pixel structure can decrease color shift at a large viewing angle [7][8][9][10][11][12], but the brightness loss is aggravated due to its lower aperture ratio. The phase compensation film [7,[13][14][15][16][17][18][19][20]] can increase contrast and reduce color shift at a large viewing angle, however, the contribution is not sufficient, and the brightness loss remains unresolved.…”

“…Some researchers have contributed to this issue; a multidomain pixel structure can decrease color shift at a large viewing angle [7][8][9][10][11][12], but the brightness loss is aggravated due to its lower aperture ratio. The phase compensation film [7,[13][14][15][16][17][18][19][20]] can increase contrast and reduce color shift at a large viewing angle, however, the contribution is not sufficient, and the brightness loss remains unresolved. Optical films with microstructures can reduce the color shift and color washout at large viewing angles [21][22][23], but the contrast is reduced severely.…”

“…When the luminous efficiency of OLED is constant, the light-mixing effect will produce negative influence at small viewing angles on account of a large amount of incident light is scattered to large viewing angles. The light control power can be electronically controlled by a liquid crystal lens [31], so the display performance of small and large viewing angles can be transformed for display devices, as the lens-like liquid crystal cell has been applied to LCDs or OLEDs [7].…”

“…The collimated LCD or OLED is introduced owing to its low color shift characteristic, as a result of suppressing phase difference of the LC layer or the blue shift of OLED. Therefore, the light-mixing power from different viewing angles can contribute to the decreases in the color shift [7,30], which can be electronically controlled in the LCLC. Besides, the brightness increasement at large viewing angles is also proved.…”