This study develops a highly-efficient light-guide plate for edge lighting backlight
module that has no optical films. The light guide plate is designed to control the angle of the
incident rays to the top surface from light source, to get the highest uniformity of intensity for thin
edge lighting backlight system applications. The micro-prisms of pyramidal shape on the top
surface can highly-efficient collimate with the light rays. Another micro-prism of v-cut shape on the
bottom surface can reflect the incident light into the front direction and mixing the rays in the lightguide
plate with the high uniformity. A novel design concept of the v-cut is the regular density
varies of the cut in the LGP. The modeling simulation program, employing a Monte Carlo method
based on TracePro software, has optimized the shape of the pyramidal micro-prisms on the top
surface and the density distribution condition of the v-cut micro-prisms on the bottom surface, also
the multiple scattering characteristics. The two types of the micro-prisms at the top and bottom
surface can be highly recommended for the uniformity of the brightness via the optimal design
process. Future work is warranted on improving the optical efficiency by using light-emitting
diodes as a light source. The backlight module will allow us to increase the optical efficiency and to
lower the total cost in portable LCD applications. The study confirms that a uniformity of
brightness can be achieved without using any optical films, resulting in a high uniformity of 84%.
Highly precise optical model for simulating light guide plate using LED light source
