Multi-passband Filters For The Application Of 3D Glasses Based On Wavelength Multiplexing Approach

Since the 20th century,3D display has been widely concerned,and up to now,it has occupied an important place in the film and television industry.With the improvement of living standards and the development of science and technology,people's requirements for 3D performance are getting higher and higher.According to the requirements of 3D glasses,a new type of wavelength division multiplexed three-band pass filter was developed,which is a high-magnitude narrow-three-band pass filter with complementary passbands in the visible range of left and right lenses.The difference in wavelength achieves separation of left and right eye images,resulting in binocular parallax.Through experiments,the physical,chemical and spectral properties of various thin film materials were analyzed.Finally,TiO₂ was selected as the high refractive index material,and SiO₂ was the low refractive index material.During the deposition process,due to the unstable nature of the TiO₂ material,it is easy to generate low-valent oxides and affect the structure of the film,resulting in changes in the properties of the film.Therefore,the TiO₂ film was tested and analyzed.The film was deposited using a microwave plasma assisted pulsed DC magnetron sputtering apparatus.In the experiment,the oxygen flow rate and the plasma microwave power were respectively changed to deposit a TiO₂ monolayer film.SEM,AFM,Raman spectroscopy,XRD and spectrophotometer were used to simulate and analyze the surface roughness and spectral properties of TiO₂ film,which having a low surface scattering and absorption coefficient was obtained after we combined the experimental results and further optimized the process.Considering the effects of light scattering and absorption,a new TiO₂ monolayer film structure was established:Substrate/deal TiO₂ layer/Rough surface layer.The stacked layer scattering model was established by combining OJL model,KK relational,scattering model and Bruggeman model.The spectral curve was fitted by Code software to calculate the optical constant of the more accurate film material.The optical constant of the material was introduced into the membrane design software,and combined with the Fabry-Posit?F-P?structure and the multi-bandpass structure,the membrane system design of the left and right lenses was further optimized.The designed physical film thickness was introduced into the Inficon IC/5 deposition controller of the MicroDyn magnetron sputtering equipment,and the obtained process parameters were optimized using the film material to complete the preparation of the left and right lenses three-pass filter film.The developed sample was subjected to spectral test,and the measurement curve was basically consistent with the design curve,and the thickness errors of the left and right lenses were all controlled within 0.5%.Based on the error of the sample transmittance,the scattering value was re-evaluated,and the additional parameter L was introduced to redefine the rough surface characteristic equation.Finally,the prepared optical film was tested for firmness,temperature resistance and moisture resistance.