Simple liquid crystal display backlight unit comprising only a single-sheet micropatterned polydimethylsiloxane (PDMS) light-guide plate

Abstract

A simple liquid crystal display (LCD) backlight unit (BLU) comprising only a single-sheet polydimethylsiloxane (PDMS) light-guide plate (LGP) has been developed. The PDMS LGP, having micropatterns with an inverse-trapezoidal cross section, was fabricated by backside 3-D diffuser lithography followed by PDMS-to-PDMS replication. The fabricated BLU showed an average luminance of 2878 cd/m(2) with 73.3% uniformity when mounted in a 5.08 cm backlight module with four side view 0.85cd LEDs. The developed BLU can greatly reduce the cost and thickness of LCDs, and it can be applied to flexible displays as a flexible light source due to the flexible characteristic of the PDMS itself.

Optimization of Ultrathin Backlight Unit by Using a Tapered Light Guide Film Studied by Optical Simulation

“…Various micro-patterns have been applied to the upper and/or lower surface(s) of the light guide plate for adjusting the luminance distribution and increasing the overall efficiency of backlights [2,[11][12]. As a typical light-extraction component, diffusely reflecting dot patterns are formed on the bottom surface for redirecting the guided light toward the LCD panel.…”

“…Scattering patterns formed on the backside of LGPs direct the guided light toward the LCD panel. Many theoretical and experimental efforts have been made for the improvement of LGP technology since it plays the most important role in the edge-lit BLUs [1][2][3][4][5][6][7][8][9][10][11][12].…”

A High Performance Single-Domain LCD With Wide Luminance Distribution

“…A two-dimensional micropyramid film was also developed to replace two BEFs in backlight modules [37]. More compact backlight unit consists of only a single-layer light guide plate (LGP) which integrates conventional LGP, BEFs, and diffusers [38]. There are also multi-layer micro-structured backlight plates as described in [39], in which the main layer serves to guide the light through, and a reflective layer with micro-structures on the bottom serves to collimate the backlight.…”

Simulation and Fabrication of the Cone Sheet for LCD Backlight Application

“…The cone array textures were made by the diffuse lithographic method [9]. The photolithographic process to fabricate cone array sheet consists of 6 steps; spin coating, soft baking, exposure, post exposure baking (PEB), developing, and rinsing.…”