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Touch screen based on lattice structure distribution gratings

A technology of dot matrix structure and touch screen, applied in the field of touch screen, can solve the problems of limited size of touch screen, large transmission loss, complex algorithm, etc., and achieve the effect of reducing transmission loss and improving sensitivity

Active Publication Date: 2020-01-03
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Infrared touch screen currently dominates the large-size touch market, but it is still a traditional contact touch, so the size of the touch screen is limited
[0008] The above-mentioned touch screens all require contact interaction between the operator and the touch screen. This contact interaction must consider the physical limitations that the operator can interact with, which undoubtedly limits the size of the touch screen.
The current non-contact interaction in the market is mainly based on human-computer interaction of image processing, but this interaction method has disadvantages such as high cost, complex algorithm and large delay.
[0009] At present, there is a grating-based optical touch screen (patent application number: 201410203219.1). Although this touch screen does not need to provide an additional light source, the light intensity will decrease significantly after the display light is reflected by the grating multiple times. Light, the efficiency and touch accuracy of this touch screen are low
On the other hand, since there is a grating on the entire surface of the optical waveguide, it will cause a large transmission loss

Method used

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  • Touch screen based on lattice structure distribution gratings
  • Touch screen based on lattice structure distribution gratings
  • Touch screen based on lattice structure distribution gratings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Picture 8 It is a schematic structural cross-sectional view of Embodiment 1 of a touch screen based on a lattice structure grating of the present invention. In order to protect the grating 203, the grating 203 is embedded in the optical waveguide layer 202 in a lattice structure in an embedded manner. The photodetectors 204 are provided on the four side walls of the optical waveguide layer 202 or two adjacent side walls. When the grating 203 is a one-dimensional structure, the optical waveguide layer is divided into two upper and lower layers and the grating directions on the upper and lower optical waveguides are perpendicular to each other. Preferably, the grating structure and lattice on the upper and lower optical waveguides are arranged The two aspects meet the maximum conditions of claim 1 and claim 2 respectively; when the grating 203 is a two-dimensional structure, preferably, the grating structure and the lattice structure in the X direction and the Y direction...

Embodiment 2

[0072] Picture 9 It is a schematic structural cross-sectional view of Embodiment 2 of a touch screen based on a lattice structure grating of the present invention. Different from the first embodiment, this embodiment can protect the grating 203 and improve the coupling efficiency of the grating by plating a layer of high refractive index medium on the grating 203 structure. The photodetectors 204 are provided on the four side walls of the optical waveguide layer 202 or two adjacent side walls. When the grating 203 is a one-dimensional structure, the optical waveguide layer is divided into two upper and lower layers and the grating directions on the upper and lower optical waveguides are perpendicular to each other. Preferably, the grating structure and lattice on the upper and lower optical waveguides are arranged The structure meets the maximum conditions of claim 1 and claim 2 in two aspects; when the grating 203 is a two-dimensional structure, preferably, the grating struct...

Embodiment 3

[0075] Picture 10 It is a schematic cross-sectional structure diagram of Embodiment 3 of a touch screen based on a lattice structure grating of the present invention. This embodiment adopts a double-layer optical waveguide layer 202 and a grating 203 structure. The grating 203 is a two-dimensional structure. This structure can effectively improve the efficiency of the touch screen. Like the first embodiment, an embedded method The grating 203 is embedded in the optical waveguide layer 202 in a lattice structure. The photodetectors 204 are provided on the four side walls of the optical waveguide layer 202 or two adjacent side walls. In order to reduce ambient light interference, a filter is attached to the sidewall of the optical waveguide layer 202 adjacent to the photodetector 204. The optical waveguide layer 202 is a transparent material. Below the optical waveguide layer 202 are an isolation layer and a display screen, but the application scenarios are not limited to the ...

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Abstract

The invention discloses a grating touch screen based on lattice structure distribution. The optical grating touch screen comprises a laser light source, an optical waveguide layer, an optical gratingand photoelectric detectors, and the optical grating distributed in a lattice structure is reasonably arranged on the optical waveguide layer, so that the efficiency of detection light of the laser light source reaching the peripheral photoelectric detectors through the optical grating touch screen is maximum, and the sensitivity of the touch screen is effectively improved.

Description

Technical field [0001] The invention relates to information display, in particular to a touch screen based on a lattice structure distributed grating. Background technique [0002] According to the different technical principles of the touch screen, it can be divided into four basic types: resistive touch screen, capacitive touch screen, surface acoustic wave touch screen and infrared touch screen. [0003] The resistive touch screen uses two highly transparent conductive layers to form a touch screen. Usually an elastic material is used to separate the two conductive layers. When the pressure on the touch screen is large enough, contact occurs between the two layers. Read the contact voltage to determine the touch point coordinates. The resistive screen has the advantages of high precision and low cost, and the screen is not affected by dust, water vapor and oil, and can be touched with any object, but its light transmittance is low and it is not wear-resistant. [0004] The capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042
CPCG06F3/042G06F2203/04109
Inventor 叶志成王成亮
Owner SHANGHAI JIAOTONG UNIV