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A multi-touch screen based on frustrated total internal reflection technology and its method for identifying multi-touch

A suppressed total internal reflection, multi-touch screen technology, applied in the input/output process of data processing, instruments, electrical digital data processing, etc. Touch screen system weight and other issues, to achieve the effect of reducing after-sales maintenance costs, easy production and maintenance, and good anti-light interference ability

Active Publication Date: 2018-03-23
TSD ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a design increases the thickness of the touch screen, which is not conducive to the design and installation of the system.
[0004] In order to ensure that the optical signal is introduced into the touch screen substrate to form total internal reflection, the optical prism usually needs to be coupled to the touch screen substrate and has a close refractive index to the touch screen substrate. When the touch screen substrate is made of glass, glass is usually selected as the material of the prism, which means This leads to an increase in the weight of the optical prism, which also increases the weight of the entire touch screen system; at the same time, the optical prism is coupled with the touch screen substrate through glue. Affects the performance of the touch screen

Method used

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  • A multi-touch screen based on frustrated total internal reflection technology and its method for identifying multi-touch
  • A multi-touch screen based on frustrated total internal reflection technology and its method for identifying multi-touch
  • A multi-touch screen based on frustrated total internal reflection technology and its method for identifying multi-touch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, the infrared emitting tube is used as the light source 2, and the infrared receiving tube is used as the light receiver 5. Optical glass (refractive index about 1.52) is used as the touch screen substrate 1, according to the formula n 1 sinθ 1 =n 2 Calculate the minimum incident angle, select the slope 4 with an angle greater than 45°, and perform polishing. The infrared emitting tube emits infrared light which is reflected by the mirror 6 and then perpendicular to the non-touch surface 102 of the touch screen substrate 1 and enters the touch screen substrate 1 to form total internal reflection. The horizontal angle between the mirror 6 and the touch screen substrate 1 is about 112° to ensure that the infrared light can be projected perpendicular to the non-touch surface 1023 of the touch screen substrate 1 . Infrared light is transmitted in the touch screen substrate 1 by total reflection, forms an infrared light network on the touch surf...

example 2

[0038] Such as figure 2 As shown, the present embodiment is further coupled based on Embodiment 1, and the infrared emitting tube and the reflector 6 are coupled together to form the light source 2, and the infrared receiving tube and the reflector 6 are coupled together to form the light receiver 5; the light source 2 The emitted infrared light is perpendicular to the non-touch surface 102 of the touch screen substrate 1 and enters the touch screen substrate 1 to form total internal reflection transmission. The non-touch surface 102 of the touch screen substrate 1 forms an angle of 45° with the horizontal plane and is polished. Infrared light is transmitted in the touch screen substrate 1 by total reflection, forms an infrared light network on the touch surface 101 of the touch screen substrate 1, and is transmitted to the light receiver 5 through the non-touch surface 102 of the touch screen substrate 1 at the corresponding end of the touch screen substrate 1, Thus forming...

example 3

[0040] In this embodiment, the mirror 6 is used as a light guide component to transmit the optical signal 8 into the substrate to form total internal reflection. Such as image 3As shown, the non-touch surface 102 of the touch screen substrate 1 forms an angle greater than 113° with the horizontal plane and is mirror-coated to form a reflective mirror 6. The infrared reflection tube emits infrared light perpendicular to the touch screen substrate 1 and passes through the non-touch surface 102 of the touch screen substrate 1. After reflection, it enters the touch screen substrate 1 to form total internal reflection. Infrared light is transmitted in the touch screen substrate 1 by total reflection, forms an infrared light network on the touch surface 101 of the touch screen substrate 1, and is transmitted to the The optical receiver 5 forms a complete transmitting and receiving system.

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Abstract

The invention discloses a multi-touch screen based on a frustrated total internal reflection technology. The multi-touch screen comprises a touch screen substrate, a light source, a light guide assembly, a light receiver and a supporting assembly, wherein the touch screen substrate forms total internal reflection; the light source is near a non-touch surface of the touch screen substrate; the light guide assembly guides the light of the light source into the touch screen substrate to form the total internal reflection; the light receiver receives the light subjected to the total internal reflection; and the light source, the light guide assembly and the light receiver are arranged below the non-touch surface by the supporting assembly in a semi-closed way. The invention provides the multi-touch screen which can effectively reduce the integral thickness and weight of a touch screen system based on the total internal reflection technology, lowers the cost of the class of products, and puts the light source, the light guide assembly and the light receiver into the supporting assembly in the semi-closed way, and effectively improves a light interference resistance capability.

Description

technical field [0001] A touch screen, in particular a multi-point touch screen based on frustrated total internal reflection technology. Background technique [0002] Existing touch screens based on the frustrated total internal reflection technology usually use infrared light to guide the touch screen substrate through optical edges and corners for total internal reflection. This type of structure has the following problems: [0003] The processing size of optical prism is larger. In order to ensure that the optical signal is introduced into the touch screen substrate to form total internal reflection, and to ensure that the optical signal transmitted in the substrate has sufficient intensity to be received by the optical receiver, the optical prism is usually designed to be the same size as the light source. In order to ensure that the optical signal is guided into the touch screen The minimum angle of incidence of the panel, such optical prisms usually have a high proj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/042
CPCG06F3/0421G06F2203/04808
Inventor 王志旭伏强徐响林徐勇
Owner TSD ELECTRONICS TECH
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