Boosted Ambient Contrast Ratio of Light-Emitting Diode Display Devices With High Light Output Using a Laminated Interlaced Microgroove Janus Structure

Abstract

A high ambient contrast ratio (ACR) and brightness are critical for realizing high dynamic range (HDR) in advanced display applications. However, improving the ACR while maintaining high light output for display devices is still challenging. To solve this issue, we proposed a laminated interlaced microgroove (LIM) Janus structure, consisting of intersecting microgrooves cutting through the extinction and scattering layers, leading to highly improved ACR with less optical loss for display devices. Optical simulation was performed to optimize the LIM Janus structure, revealing the antireflection and light extraction mechanism with low reflectance and high light output. According to the high-speed dicing technique, the optimized LIM Janus film was prepared and assembled on light-emitting diode (LED) display devices. Compared with commercial display devices with graphite coating, the LIM display devices achieved a high ACR boosted from 2209 to 25 188 with an improvement of 1040% (ambient light 500 lux) while maintaining the high light output. The LIM Janus structure is facile and can be easily integrated into display devices to obtain excellent ACR and light output to satisfy the broad application of advanced displays.