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Optical waveguide touch screen based on grating structure

An optical waveguide and touch screen technology, which is applied in the field of optical waveguide touch screens, can solve the problems of affecting touch accuracy, affecting touch screen positioning performance, and low resolution, so as to save costs, protect eyes, and improve color purity.

Active Publication Date: 2017-03-22
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In practical applications, if there is a problem with one or more infrared emitting tubes, it will affect the positioning performance of the touch screen
At the same time, the infrared emitting tube has an emitting angle, and the receiving tube has a wide range of receiving angles. If the surrounding reflection is to a certain extent, it will affect the touch accuracy and the resolution is low.

Method used

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  • Optical waveguide touch screen based on grating structure
  • Optical waveguide touch screen based on grating structure
  • Optical waveguide touch screen based on grating structure

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0026] The coupling formula of the grating waveguide +1 level and -1 level is shown in formula (1). Among them, k 0 is the wave number in vacuum, n 0 is the refractive index of the incident medium, θ is the incident angle in the waveguide, T is the grating period, n 1 is the waveguide refractive index, n eff is the effective refractive index of the waveguide. In the absolute value part of the formula (1), the positive sign is taken for the +1 order diffracted light, and the negative sign is taken for the -1 order diffracted light. and have

[0027]

[0028] According to the simplification of the formula (1), it can be obtained that the +1 order diffracted light becomes the waveguide mode in the waveguide, the following conditions should be met:

[0029]

[0...

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Abstract

The invention discloses a grating structure-based optical waveguide touch screen, which comprises a transparent protective layer, a substrate, an optical waveguide layer, an optical grating and an optical receiver. The diffraction of the optical grating is utilized, so that light with specific short wavelength in display light becomes a waveguide mode capable of being transmitted in waveguide, the waveguide mode serves as detection light for touch, a light source is not required to be provided additionally, the cost is saved and the color purity of the display light is effectively improved. Meanwhile, the optical waveguide can effectively overcome the interference of interior light, and the touch accuracy is improved through a waveguide matrix.

Description

technical field [0001] The invention relates to an interactive touch technology in the field of information display technology, in particular to an optical waveguide touch screen based on a grating and a display backlight. Background technique [0002] According to different technical principles, touch technology mainly has four variables: sound (surface acoustic wave technology), light (infrared technology, optical technology, holographic touch), electricity (resistive and capacitive), and pressure (vector pressure sensing technology). way of perception. According to the four variable sensing technologies of sound, light and voltage, the mainstream touch screen products commercialized in the current market are: (1) resistive touch screen; (2) capacitive touch screen; (3) surface acoustic wave touch screen; (4) infrared touch screen. [0003] The resistive touch screen is to paste a conductive film on the outside of the glass panel, and change the conductivity of the piezoe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/042G02B6/122
Inventor 崔杰叶志成
Owner SHANGHAI JIAOTONG UNIV
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