A Research of Modifying Moir? Effect to Design and Fabricate High Efficiency Backlight Diffuser
Date Issued
2010
Date
2010
Author(s)
Hsieh, Shu-Ming
Abstract
This dissertation aims to discuss the diffuse effect of the overlaid cylindrical lens array by applying moiré phenomena, geometry optic, and aberration theorem. The diffuser in back light module is to diffuse light source, providing a uniform surface light. Traditional diffuser, using chemical particle to scatter incident light, has some disadvantages, including lower light transmission efficiency, and insufficient diffuse ability occurred as the interval to light source is too low. So as to resolving these problems, and overlapped cylindrical lens arrays, that is moiré lens, will be provided.
Due to the moiré phenomena, short focal length of the micro-lens, and aberration, the moiré lens, the overlaid two half-cylindrical lens arrays have better diffuse effect. Using the moiré lens as a diffuser has many advantages. First, simple surface profile and one-dimension pattern simplify the fabrication process. Second, the absence of chemical particle avoids the light-absorbed problem; therefore, light transmission efficiency can be increased. Finally, the better diffuse effect of moiré lens can be achieved in short interval of film and light source.
This dissertation will initially discuss moiré lens in three points: moiré phenomena, geometric optics, and aberration theorem. Then the optimizing model will be developed. Finally, in comparison with moiré lens and traditional diffuser, the possibility of replacing or recombining traditional diffuser will be discussed.
Subjects
diffuser
moir?lens
view angle
lenticular lens
Type
thesis
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