Abstract
Mini-light-emitting diodes (mini-LEDs) were combined with multiple three-dimensional (3D) diffuse reflection cavity arrays (DRCAs) to produce thin, large-area, high-brightness, flat light source modules. The curvature of the 3D free-form DRCA was optimized to control its light path; this increased the distance between light sources and reduced the number of light sources used. Experiments with a 12.3-inch prototype indicated that 216 mini-LEDs were required for a 6 mm optical mixing distance to achieve a thin, large-area surface with high brightness, uniformity, and color saturation of 23,044 cd/m2, 90.13%, and 119.2, respectively. This module can serve as the local dimming backlight in next generation automotive displays.
Highlights
Display technology has developed rapidly, starting in the second half of the 20th century, and various types of displays have become ubiquitous in daily life
Direct-type backlights have lower cost, higher optical efficiency, and straightforward design compared with side-type backlights, and they have become dominant in the large-sized liquid crystal displays (LCDs) backlight module market [9,10,11]
This study proposes mini-light-emitting diodes (LEDs) combined withused multiple three-dimensional planar light sources to reduce the number of LEDs requires further study. (3D) diffuse reflection cavity arrays (DRCAs) to achieve a thin, large-area, and high-luminance
Summary
Display technology has developed rapidly, starting in the second half of the 20th century, and various types of displays have become ubiquitous in daily life. Zhu et al proposed a free-form surface design method for LEDs to achieve diffusion and transmission This lighting system affords advantages such as high efficiency and high uniformity [37,38,39]. Zhu et al proposed diffuse reflective Off-Axis surface of 12 for noncircular LED arrays [46] These two designs can achieve large-area 3light sources, they cannot achieve a thin, high-luminance, flat light source. Fuse reflection cavity arrays (DRCAs) to achieve a thin, large-area, and high-luminance planar light source
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