We propose a new display, named as scanning waveguide display, that achieves a large eye box and FOV simultaneously. The display uses an off-axis lens array with extremely low f/# as the out-coupler. The lens array is fabricated by cholesteric liquid crystal polarization holography. We demonstrate a diagonal FOV of 100°, which far exceeds the theoretical limit of waveguide displays.
Micro-scale light emitting diode (micro-LED) with a chip size less than 100 μm has improved light extraction efficiency due to increased sidewall emission. However, it causes mismatched angular distributions between AlGaInP-based red micro-LED and InGaN-based blue/green counterparts because of the epitaxial material difference. As a result, color shift of RGB micro-LED displays may become visually noticeable. To address this issue, the angular distributions of RGB micro-LEDs are analyzed theoretically and experimentally. In addition, a device structure with top black matrix and taper angle in micro-LEDs is proposed, which greatly suppresses the color shift while keeping a reasonably high light extraction efficiency.
We introduce mini-LED as a promising solution for high dynamic range displays. For mini-LED backlit local dimming LCD, we build a model to simulate the displayed image quality. Through modeling and subjective experiments, we demonstrate that the annoying halo effect could be suppressed to an unnoticeable level by appropriately choosing local dimming zone number and LCD contrast ratio. For mini/micro-LED emissive displays, we discuss the ambient excitation/reflection issues for the two typical full-color solutions and the corresponding size effect. The high luminance and excellent dark state, low power consumption and thin profile, long lifetime and free form factors will make mini- LED displays the next-generation high dynamic range solutions.
We report a polarization-multiplexed additive light field display for near-eye applications. A polarization-sensitive Pancharatnam-Berry phase lens is implemented to generate two focal depths simultaneously. Then, a spatial polarization modulator is utilized to control the polarization state of each pixel and direct the two images to designated focal planes. Based on this design, an additive light field display system is constructed. The vergence-accommodation conflict is suppressed successfully without increasing space and time complexities.
We report a polarization-multiplexed additive light field display for near-eye applications. A polarization-sensitive Pancharatnam-Berry phase lens is implemented to generate two focal depths simultaneously. Then, a spatial polarization modulator is utilized to control the polarization state of each pixel and direct the two images to designated focal planes. Based on this design, an additive light field display system is constructed. The vergence-accommodation conflict is suppressed successfully without increasing space and time complexities.
Ambient contrast ratio (A-CR) is a critically important characteristic for mobile displays. For transmissive and emissive displays (such as liquid crystal display, light-emitting diode, and organic light-emitting diode), A-CR decreases dramatically as the ambient light increases, which degrades the image quality, especially for outdoor applications. Moth-eye-like structure greatly reduces the surface reflection and improves A-CR. For a touch panel display, the surface should be robust enough to resist possible mechanical scratches and to self-clean possible contaminations from fingerprints and dusts.
In this paper, we demonstrate the moth-eye-like structure fabricated on a hard-coating layer with additional surface treatment for self-cleaning property upon the flexible film. By laminating the film unto a display device, the luminous reflectance is reduced to ~0.23%, which improves the A-CR by ~4X under the sun. Note that although the surface reflection is reduced, the haze remains negligible, implying that the image quality is not blurred. The nanostructure was fabricated on the hard-coating layer which is typically used as the protective film of the mobile display and hence it is anti-scratched. Typically, nanostructure exhibits hydrophobic and olephobic properties. With suitable surface treatment by amphiphilic molecules, such characteristics are further improved with excellent self-cleaning properties. Besides, our nanostructured hard-coating film can be fabricated on different flexible films, such as TAC and PET, which means this broadband antireflection film can be used for flexible displays.
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