Dye-less color filter fabricated by roll-to-roll imprinting for liquid crystal display applications

Hui-Hsiung Lin,Chi-Hung Lee,Mao-Hong Lu

doi:10.1364/oe.17.012397

Abstract

A diffractive grating is promising for color separation to effectively replace conventional absorptive dye color filter in liquid crystal displays. In this paper, we demonstrated a color separation module consisting of an aspheric-lenticular lens array and a blazed grating to substitute for the dye color filter. Each component was designed to match the recent fabrication ability of our roll-to-roll imprinting. The measurement results of a prototype module showed a gain factor of transmission efficiency three times more than that of conventional color filters.

Highlights

Liquid crystal display (LCD) is the most widely used terminal component in computer, communication, and consumer electronics due to its thinner size and lighter
Conventional color filters using dye-gelatin cannot perform high color purity and high efficiency simultaneously; that is because high color purity depends on high coherence light source, whereas high efficiency requires low-absorption and high-transmittance materials
We propose a roll-to-roll imprinted optical setup consisting of an asphericlenticular-lens array and a blazed grating, which is an advanced design for previous study [10] and termed blazed color separation grating (BCSG)

Summary

Introduction

Liquid crystal display (LCD) is the most widely used terminal component in computer, communication, and consumer electronics due to its thinner size and lighter. It requires cost effectiveness, low power consumption and high image quality. Conventional color filters used in LCD system consist of dyed material, which generates visible colors by transmitting the desired bandwidth of light and absorbing the undesired spectra. In the case of portable display products such as notebook personal computers, low transmissivity directly impacts the power consumption and corresponding battery life. Conventional color filters using dye-gelatin cannot perform high color purity and high efficiency simultaneously; that is because high color purity depends on high coherence light source, whereas high efficiency requires low-absorption and high-transmittance materials.

Methods

Results

Conclusion