Yoji Kawasaki

53.3: New Light-bar Emitting Phosphor-converted White Line Light Pumped by InGaN/GaN Laser Diode for Edge-lit Backlight Unit Applications

A new type of light bar using laser diode for LCD backlight applications is presented. It consists of six white line-emission units including a high-power InGaN/GaN laser diode (LD). The LD emits at around 400nm and pumps up phosphors coated on a glass light-guide stick in the line-emission unit. It is demonstrated that a prototype of new LD package is capable of more efficient thermal transfer than the conventional CAN-type ones. The LD light bar has the following advantages: 1) fewer light emitting elements, 2) longer continuous white line emission, 3) higher rate of heat transfer.

57.4: Thin Side‐Lit, Hollow‐Cavity Flat LED Lighting Panel for Ultra‐Uniform LCD Backlight Applications

A new and thin, FL2P(Flat LED Lighting Panel) with ultra-high-uniformity for LCD backlight is presented. It has a hollow-cavity structure consisting of a pair of LED/collimator units, a slightly curved bottom reflector and a top diffuser, without any planar light guide inside. It has a great advantage of making itself thinner, less weight and lower cost. The LED/collimator unit has a collimating cylindrical lens and a side-placed RGB LED array. The collimating lens is developed particularly for higher-coupling efficiency and narrower beam to achieve thinner structure and more excellent uniformity.