Large-screen three-dimensional measuring touch screen

Abstract

The invention provides a big screen three-dimensional measurement touch screen, light sources are installed at a plurality of rims in the detecting area, a main lens is installed at a position opposite to the light sources, the focal point of the main lens is provided with an ostiole or a narrow slit as a light diaphragm, a lens is provided on the other side of the light diaphragm, the lens and the main lens constitute a confocal optical system, the optical system takes the image of the light source on the photoelectric sensor array, the part of the light source shaded by the shade object forms a shade area on the photoelectric sensor array, the three-dimensional position coordinates of the shade object are obtained after the single-chip system processes signals after photoelectricity conversion executed by the photoelectric sensor array executes, and the three-dimensional position coordinates are transmitted to the exterior applied system through communicating interfaces. The invention can be installed on the projection screen for teaching, for executing interdynamic teaching; can be used in conference projection screen for executing touch operations or calligraph on big screen; and also can be used in interdynamic entertainment equipments, thereby increasing in situ feeling and participation sense, and having a prodigious spreading applications value.

Description

technical field [0001] The invention relates to a three-dimensional measurement touch screen for 17-200-inch large screens, more specifically, it belongs to a large-screen three-dimensional measurement touch screen that can measure the XY position of an obstruction in the screen area and the approach distance to the screen. Background technique [0002] The existing touch screen adopts the following four schemes: [0003] 1. Resistive touch screen. The screen part of the resistive touch screen is a multi-layer composite film attached to the surface of the display. It consists of a layer of glass or plexiglass as the base layer, and the surface is coated with a transparent conductive layer (ITO, indium oxide), and then covered with an outer surface. The hardened, smooth, scratch-resistant plastic layer is also coated on the inside with a layer of ITO, and there are many small (less than one-thousandth of an inch) transparent isolation points between the two conductive layers...

AI Technical Summary

Problems solved by technology

[0007] Published patent applications 01140344.6, 99110572.9, and 99215973.3 do not use active light sources, and the surrounding light will have many restrictions on the operation of the equipment, and the equipment is more complicated; or additional handheld equipment is required for interaction, and it cannot be used as a three-dimensional measurement touch screen. Limited to the complexity of use or structure, which affects its promotion

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