Reflective color filter

A color filter and reflective technology, applied in the direction of diffraction grating, optics, optical elements, etc., can solve the problems of unfavorable energy saving and environmental protection, low light energy utilization rate, etc., achieve simple structure, facilitate production, and improve light energy utilization rate Effect

Active Publication Date: 2012-02-08
SUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because this kind of filter absorbs light waves of most colors, its light energy utilization rate is relatively low, only about 30%, which is not conducive to energy saving and environmental protection.

Method used

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  • Reflective color filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In this embodiment, the formation of a magenta grating structure is taken as an example for illustration.

[0040] Please continue to see figure 2 , in this embodiment, the substrate 110 is a flexible material, specifically PET or PC. The dielectric grating 120 is a one-dimensional grating, and the material is PMMA. Metal layer 130 is aluminum. Further, the period p of the dielectric grating 120 is 200 nm, the duty ratio is F=0.5, and the thickness h1 is 280 nm. Metal layer thickness h2=30nm.

[0041] The reflection characteristics and angle tolerance of the filter were analyzed by rigorous coupled wave theory (RCWA). Due to the surface plasmon resonance phenomenon of the metal layer and the coupling effect of light and the surface periodic structure, part of the light is reflected, and the other part of the light is absorbed, and the transmittance is almost zero. TM polarized light is incident from the top of the structure at an angle ranging from 0° to 45°.

[...

Embodiment 2

[0045] This embodiment is to study the filter structures of different colors corresponding to different dielectric grating thicknesses. Except for the thickness of the dielectric grating, other parameters are consistent with those in Embodiment 1.

[0046] See Figure 5 , Figure 5 It is the relationship diagram between the reflection efficiency of TM light and the incident wavelength and the height h1 of the dielectric grating. When h1 changes between 0.23um and 0.33um, the position of the reflection valley changes. That is to say, by controlling the height of different dielectric gratings, the human eye will observe different colors under the incident condition of TM light. According to this characteristic, as long as dielectric grating structures with different thicknesses are designed on different pixels of the filter, the production of color filters can be realized. For example, for the grating structure corresponding to the magenta pixel, the thickness of the dielect...

Embodiment 3

[0048] Considering the errors in the process of fabricating the optical filter in the experiment, the effects of the occupation ratio of the dielectric grating and the thickness of the metal film on the reflection efficiency were observed.

[0049] First, observe the effect of the duty ratio of the dielectric grating on the reflection efficiency.

[0050] In the case that other parameters are consistent with those in the first embodiment, the duty ratio F of the dielectric grating is changed. Image 6 It is the relationship diagram of the reflection efficiency of TM light with the incident wavelength and the duty ratio of the dielectric grating.

[0051] When F changes between 0.45um and 0.55um, the position of the reflection valley changes, but the range of change is not large, basically still in the green light band (510nm-560nm). That is to say, under the error of 20% in the width ratio of the dielectric grating, the filtering effect of the color filter of the present inve...

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Abstract

The invention relates to a reflection color filter, which comprises a three-color pixel array, wherein each color of pixel is an optical grating structure; and the optical grating structure comprises a substrate, a dielectric optical grating and a metal layer, wherein the metal layer completely covers the dielectric optical grating, the thickness of the metal layer is smaller than the half of the groove width of the dielectric optical grating, and the thickness of the dielectric optical grating corresponds to complementary color light of filtering color of the optical grating structure. The reflective color filter is used for carrying out color filtering on the basis of a substrative theorem, not only ahs higher optical energy utilization rate but also has the characteristics of low angle sensitiveness, benefit for manufacturing and the like.

Description

technical field [0001] The invention relates to an optical filter element, in particular to a wide-angle reflective filter with a grating structure. Background technique [0002] Inspired by the light selection effect of the biological skin structure in nature, people found that the nanostructure can realize the three primary colors, and has a certain spectral width and viewing angle latitude. If it is possible to artificially design and prepare specific nanostructures to realize colors, energy saving and environmental protection will be achieved in the printing and display industries. [0003] The necessity of carrying out exploration and research lies in: 1) The traditional color filters used in liquid crystal flat panel displays are composed of organic substances such as anthraquinone and phthalocyanine, and realize red, green and blue color display by absorbing different spectra. However, the transmission efficiency of this absorbing color filter is extremely low, only ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/26G02B1/10G02B5/18
Inventor 周云陈林森申溯叶燕浦东林
Owner SUZHOU UNIV
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