Abstract
A high directional backlight system that combined a composite microstructure light guide plate (LGP) with a collimated light source was proposed for eco-displays. The collimated planar light was expanded from a point light source and guided towards the normal direction by utilizing the micro-prism array on LGP. High uniformity of spatial luminous, 91%, with a narrow viewing cone of ± 4° can be achieved without additional optical films. Moreover, compared to the conventional backlight, only 5% of power consumption was needed to keep the same luminance, hence, the optical efficiency increased by a factor of 1.47.
Highlights
Liquid crystal displays (LCDs) are currently dominating the display market due to their thin form factor and light weight
A typical edge-type backlight with several optical films such as brightness enhancement film (BEF)-dual brightness enhancement film (DBEF) -diffuser and reflector consumes more than 60% of the total power consumption in LCD modules, with its obvious drawback, such films increase costs and lower optical efficiencies
We demonstrate a backlight system of high optical efficiency and uniformity, narrow viewing cone in dual directions and compact form factor without using optical films
Summary
Liquid crystal displays (LCDs) are currently dominating the display market due to their thin form factor and light weight. A typical edge-type backlight with several optical films such as brightness enhancement film (BEF)-dual brightness enhancement film (DBEF) -diffuser and reflector consumes more than 60% of the total power consumption in LCD modules, with its obvious drawback, such films increase costs and lower optical efficiencies. Directional backlight system with fewer optical films added is of highly attractive. Several types of backlights with high optical efficiency were reported, to replace the conventional ones. Togaya et al have reported a backlight system using a highly scattering optical transmission (HSOT) polymer of high quality [11]. Okumura et al have reported a highly efficient HSOT backlight system without optical sheets which can control the light directly into the front direction, but the LGP based on micro-prism structures is made of a HSOT polymer, not a traditional acrylic material, polycarbonate (PC) material, or polymethyl methacrylate (PMMA) material [12]. Most of the technologies mentioned above have the same issue that only one direction of the rays can be compressed with the FWHM ± 10°~ ± 20°, but the light leakage still exists in the other direction
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