英文摘要
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With the rapid development of flat panel display industry, liquid
crystal display technology and display products; the pursuit of lighter,
thinner trends and superior performance is increasing in demand. The
light guide plate, one of the backlight components, is an important
component to control the brightness and homogeneity. Its main
technologies include micro-optical structure design and molding
capabilities. Observing the influence factors by an experiment in order to
achieve the optimum light design strategy for light guide plates will
efficiently reduce time and improve luminous efficacy, moreover,
promoting product quality and industrial competitiveness.
In this study, light guide plates are injection molded at length 80mm,
width 60mm with three various thicknesses; 0.6mm, 0.9mm and 1.2mm.
Comparisons are made from different process parameters in actual
injection molding effects on replication of micro-structure and are
examined by measuring the replication rate of micro-structure and the
residual stress of light guide plate. Next, this study uses a luminance
meter to measure the optical brightness distribution of the light guide
plate. Lastly, this study discusses the varying thickness and process
parameters affecting the replication rate of the light guide plate and
tendency of the microstructure optical quality.
This study showed that the replication rate of micro-thin light guide
plate structure increase with the in-mold temperature, melt temperature
and injection speed. In opposite, residual stress is decreased. Validation
results between replication rate and the optical brightness, under the same
process conditions (mold temperature 110oC, melt temperature 320oC),
increased injection speed from 300mm/s to 1200mm/s, as the light guide
plate of thickness 1.2 mm, the replication rate increase 1.62% and the
average luminance value increased 113 nits; at thickness 0.9 mm, the
replication rate increase 1.66% and the average luminance value
increased 113 nits; at thickness 0.6 mm, the replication rate increase
1.88% and the average luminance value increased 128 nits. As the result,
the optical brightness improved as the replication rate of micro-structure
increased. This study demonstrated that different micro-structure molding
properties cause different luminescent properties of the light guide plate.
This result can be a reference for related industrial research in design and
manufacturing.
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