Indium tin Oxide (ITO) is widely used in touch panel as a conductive material. However, it is fragile and has low transparency in low resistance. In this paper, a ITO-free transparent conductive film (TCF) has been proposed. Micronano structured patterns are designed to induce the silver paste composed by nano silver particles and organic solvents, which form the circuit of touch panel sensor conveniently. Mesh patterns are fabricated by UV nanoimprinting technology to form microgrooves on flexible polymer films coated by UV adhesive such as PET (polyethylene terephthalate). And then nano silver ink is filled into the grooves which constitute the conductive area of the TCF. The optical performance including the transmittance and haze of the TCF is tested. Finally, the TCF with the transmittance 87% and the square resistance less than 50 Ω/sq will be obtained, which can satisfy the applications in touch panel devices.
Composed by thousands of microsphere-like structures on the surface, the plastic surface relief diffuser film with
different transmittance and haze will be designed by optical simulation software. By using laser etching process, the
molding will be fabricated on the self-developed equipment with nanosecond diode pumped solid state laser. Finally, the roll to roll UV curing process will be used for fabricating the diffuser film based on polycarbonate material. The
relationship between the optical performance and the structure parameter and its distribution will be investigated. The optical performance of diffuser films will be tested by surface profiler, and spectrophotometer. These results will
contribute to the design and production of customized diffuser films.
Micron-sized grating structures (MGS) and sub-micron sized dot arrays (DA) were generated
on silicon target by multiple shots of interfering nanosecond laser beams. The mechanism to form
MGS and DA were analyzed and it is found that the obtained structures have a negative shape of
the interference pattern. The most major size of the periodic structure is 500 nm. The optical
properties of these nanostructures are also investigated. The silicon DAs function as both absorber
and antireflection layers, which offer a promising approach to enhance the solar cell energy
conversion efficiency.
Multilayer light guide films(MLGF) with LED lighting for multifunctional display has been proposed. Based on the
MLGF technology, keys can be illuminated separately on different mode. The fabrication process similar to LIGA
technology including laser etching, electroforming and hot nanoimprinting is developed. The depth of the light guide
dots can be controlled by laser pulse numbers and the influence of dots depth to the luminance uniformity is simulated.
The MLGF sample composed of 2 layers is designed and fabricated, the total thickness the module is about 0.4mm and
the depth of light guide dots ranges from 0.5 um to 10um.The optical performances testing results are given. MLGF
provides an ultrathin solution for multifunctional keypad and the fabrication process is high throughput, low cost for
large area light guide films.
A polarizing color filter, combining the function of polarizer and color filter, is proposed and
theoretically investigated. The proposed color filter comprises of a metal grating and a dielectric layer
on a glass substrate. The influence of the geometrical parameters of dielectric layer on the transmission
efficiency are discussed in detail by rigorous coupled-wave analysis (RCWA). The result shows that a
dielectric layer of high equivalent refractive index can enhance its performance effectively. A optimum
tricolor filter with more than 74.1% broadband transmission and a polarization extinction ratio of
8.39dB is obtained.For TE-polarized light, it is reflected and can be recycled in the backlight units to
increase the total energy utility. The numerical result shows that the peak transmission efficiency can
increase 21.5% by using the proposed devices.
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