Advancements in backlighting technologies for LCDs

Kevin J. Hathaway; Jeffrey A. Hawthorne; A. A. Fleisher

doi:10.1117/12.60353

1 July 1992 Advancements in backlighting technologies for LCDs

Kevin J. Hathaway, Jeffrey A. Hawthorne, A. A. Fleisher

Proceedings Volume 1664, High-Resolution Displays and Projection Systems; (1992) https://doi.org/10.1117/12.60353
Event: SPIE/IS&T 1992 Symposium on Electronic Imaging: Science and Technology, 1992, San Jose, CA, United States

Abstract

Developments in backlighting technologies for LCDs based upon fluorescent lamps have substantially reduced the display module thickness and power consumption over the last 4 years. The present state-of-the-art in fluorescent backlighting is reviewed. Currently, there are two major categories of backlighting system design used extensively in graphic type LCD modules. These are back-lamped backlights and edge-lit or light-pipe backlights. Much of the recent design effort has focused on edge-lit backlights because of their superior lighting uniformity and reduced thickness as compared to the back-lamped type of system. In the past, edge-lit backlights suffered reduced lighting efficiency when compared to the back-lamped type. Also, edge-lit backlights tended to produce a lower total luminous output than back- lamped designs. Therefore, back-lamped backlights are often found in LCD modules requiring high brightness such as avionics/military applications and especially in color LCD modules. Edge-lit backlights predominate in commercial monochrome applications such as present day laptop computers. However, recent improvements in the design of edge-lit backlights have opened the way for this approach to be used in commercial color applications as well.

Citation Download Citation

Kevin J. Hathaway, Jeffrey A. Hawthorne, and A. A. Fleisher "Advancements in backlighting technologies for LCDs", Proc. SPIE 1664, High-Resolution Displays and Projection Systems, (1 July 1992); https://doi.org/10.1117/12.60353

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