Shizuki Sasaki

Display-optimized random depolarization films: mitigating haze limitations to preserve image clarity

Shizuki Sasaki, Yasuhiro Koike

Random depolarization films (RDFs) randomize the polarization states of light emitted from displays via birefringent dopant particles, thereby resolving blackout and color degradation problems when viewed through polarized eyewear. However, these particles inherently introduce haze through light scattering. Herein, we present an …

P‐122: Random Depolarization Film for Reducing Birefringence‐Induced Color Degradation in Displays

Shizuki Sasaki, Yasuhiro Koike

We demonstrate that a random depolarization film (RDF) effectively mitigates color degradation caused by interference colors in biaxially stretched poly(ethylene terephthalate) (PET) films. The RDF layered on the PET film spatially randomizes polarization across visible wavelengths, enabling real‐color reproduction across different light‐source …

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High color-reproducibility of random depolarization films for wide color gamut displays

Shizuki Sasaki, Yasuhiro Koike

Design of Random Depolarization Films for High Image Quality of Outdoor Displays

Shizuki Sasaki, Yasuhiro Koike

Compensation for color mura on displays by reducing degree of polarization

Shizuki Sasaki, Yasuhiro Koike

In displays that use low-cost polymer films such as poly(ethylene terephthalate) (PET) as polarizer protective films, a color mura is caused by a slight amount of birefringence of the polymer film. To address the color mura, this study utilizes a random depolarization …

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Randomizing polarization of displays for fundamental improvement of color mura caused by birefringence

Shizuki Sasaki, Yasuhiro Koike

Most existing displays utilize polarization technologies to produce images and improve image quality. However, polarized light from displays causes color mura because of the birefringence of the polymer films used. Thus, eliminating color degradation remains a challenge despite the incorporation of complex …

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33‐2: Proposal of Novel Random Depolarization Film for Real‐Color Displays with Sharp Images

Shizuki Sasaki, Yasuhiro Koike

The random depolarization film (RDF), a polymer film doped with birefringent particles, converts linearly polarized light to randomly polarized light. This paper shows that a novel RDF with controlled birefringence resolves polarization problems of the display such as blackout, color change, and …

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Random depolarization film design based on modulation transfer function measurements of displays with different pixel pitches

Shizuki Sasaki, Kenichiro Masaoka, Yasuhiro Koike

Polarized light emitted from most displays causes blackout and color change problems when viewed through polarized sunglasses. These problems are addressed by random depolarization films (RDFs) doped with birefringent particles. These dopant particles, however, scatter light and degrade the sharpness of the …

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Design of random depolarization film using various birefringent particles for real-color displays

Shizuki Sasaki, Yasuhiro Koike

Liquid-crystal and organic light-emitting diode displays emit linearly polarized light, which causes blackout and color change problems when the displays are viewed through polarized sunglasses. To address both the blackout and color change problems, we proposed a random depolarization film (RDF), a …

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Color Mura Compensation by Random Depolarization Film

Shizuki Sasaki, Yasuhiro Koike

38‐3: Design of Random Depolarization Films Based on Modulation Transfer Function Measurements

Shizuki Sasaki, Kenichiro Masaoka, Yasuhiro Koike

The random depolarization film (RDF), a polymer film doped with birefringent microparticles, solves polarization problems of displays. To design the RDF that realizes sharper images, the optimal dopant particle size and suitable display's pixel size were investigated based on modulation transfer function …

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Analysis of depolarization effects of random depolarization film for real-color displays

Shizuki Sasaki, Yasuhiro Koike

A Random Depolarization Film (RDF), a polymer film doped with birefringent microparticles, randomizes polarization of the light. This study analyzed depolarization effects of the RDF that contribute to realizing real-color displays. The first effect is to decrease a degree of polarization, which …

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