Dual-view angle backlight module design

Bo Tsuen Chen, Jui-Wen Pan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


We propose a bilayer light guide plate (BLGP) with specially designed microstructures and two light source modules to achieve an adjustable viewing angle backlight for ecofriendly displays. The dual viewing angle backlight module has a thin, simple structure and a high optical efficiency. Comparison with the conventional edge-lit backlight module shows an improvement in the on-axis luminance of the narrow viewing angle mode of 4.3 times and a decrease in the half-luminance angle of 7° in the horizontal direction. When using the wide viewing angle mode, there is an improvement in the on-axis luminance of 1.8 times and an improvement in the half-luminance angle of 54° in the horizontal direction. The uniformity of illuminance can reach 80% in each mode. The backlight optical sheet number is reduced from 5 to 1.

Original languageEnglish
Pages (from-to)E80-E87
JournalApplied Optics
Issue number28
StatePublished - 1 Oct 2015


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