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Sub-wavelength grating optical film

A sub-wavelength grating and optical film technology, applied in the field of filter film and light filter, can solve the problems of damage, inability to effectively filter blue-violet light, etc., and achieve the effect of low cost

Active Publication Date: 2020-09-18
XIAMEN JUANWEN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a sub-wavelength grating optical film, which can solve the problem of damage to human eyes that cannot effectively filter or prevent the transmission of blue-violet light

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0031] Example 1, the filtering effect of a sub-wavelength grating optical film on TE polarized light, the grating structure only includes two kinds of media: the first medium 1 and the second medium 2 .

[0032] Schematic diagram of the structure of the optical film, see figure 2 middle figure 2a, The sub-wavelength grating optical film includes a plurality of one-dimensional periodic grating units arranged side by side repeatedly, and each grating unit with a grating period of p includes a first medium 1, a second medium 2, a sixth medium 6 and a seventh medium 7. The thickness or height of the first medium 1 arranged side by side at equal intervals is h and the width is w, and the second medium 2 is filled between two adjacent first mediums 1. The bottom of each grating unit is set as the sixth medium 6 of the substrate, and the top is set as the seventh medium 7 of the cover layer; the refractive index of the first medium 1 and the second medium 2 are different; the set...

Embodiment 2

[0034] Example 2, the filtering effect of the sub-wavelength grating optical film on TM polarized light.

[0035] see image 3 , On the basis of Example 1, the incident light wave is changed to TM polarized light, the simulation result of the finite element software. The simulation results show that the transmission efficiency of TM polarized light with a wavelength less than 450 nm is 65%. While the transmission of long-wavelength light is mostly greater than 96%. The light transmission efficiency of the wavelength between 450nm-518nm is almost 100% due to the waveguide resonance transmission enhancement, and the transmission efficiency of 518nm light is low due to the waveguide resonance reflection, but for the display, it will not affect the display effect, because the red color of the LED The light intensity of green and blue tricolor light is very small near 500nm. This structure can improve the blue light transmission efficiency of 450nm-500nm to ensure the blue light...

Embodiment 3

[0036] Example 3: Effect of grating duty cycle on optical film.

[0037] see Figure 4 , On the basis of Example 1, take the incident light wavelength as 420 nanometers, change the duty cycle of the grating, and the simulation results of the finite element software. The simulation results show that the duty cycle of the grating, that is, the ratio of the width of the first medium in the grating to the period of the grating, is in the range of 0.3 to 0.5, and the light wave transmission, reflection, and diffraction efficiencies do not change much, and it is always a good blue-violet light filter. light film.

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Abstract

The invention discloses a sub-wavelength grating optical film. The sub-wavelength grating optical film comprises a plurality of one-dimensional periodic grating units which are repeatedly arranged side by side. Each grating unit with the period of p comprises a first medium, a second medium, a third material, a fourth material, a fifth material, a sixth medium and a seventh medium, the sixth medium serving as a substrate is arranged at the bottoms of the grating units which are periodically arranged side by side, and the seventh medium serving as a covering layer is arranged at the tops of thegrating units which are periodically arranged side by side. By controlling the grating period and the refractive index, the incident blue-violet light meets the condition that the diffraction angle in the layer with the highest refractive index is smaller than 90 degrees; by adjusting the duty ratio of the grating and the thickness of each layer of material, the transmitted light energy of the blue-violet light wave band is the lowest, so that harmful blue-violet light can be isolated, and the method is lower in cost compared with a traditional coating mode.

Description

technical field [0001] The invention relates to light filtering technology, in particular to a light filter film, which is suitable for the display screens of TVs, computers, mobile phones and the like and the light filter film for preventing the transmission of blue-violet light in LED lighting. Background technique [0002] In white LED lighting, people use a blue light source with a wavelength of about 400-505 nanometers to generate white light by pumping yellow phosphor powder. Long-term blue-violet light exposure is very harmful to human eyes, especially blue-violet light with a wavelength below 450 nanometers has little contribution to human visual function, but it is the culprit of human eye diseases. Blue-violet light has short wavelength, high frequency, and high energy, which can penetrate the lens of the human eye and reach the retina, causing damage to it. Long-term overexposure of the human eye can cause dry eyes, eye pain, vision loss, macular degeneration, ca...

Claims

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Application Information

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IPC IPC(8): G02B5/20G02B5/18
CPCG02B5/201G02B5/203G02B5/208G02B5/18G02B5/1809G02B1/02G02B2207/101
Inventor 郑君
Owner XIAMEN JUANWEN TECH CO LTD