Touch screen adopting capacitive touch detection and real-time image positioning

A capacitive touch and real-time image technology, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc. Light interference, cost reduction, and easy installation

Inactive Publication Date: 2013-03-27
NANJING FANGRUI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each of these technologies has its own inherent drawbacks and limitations
The capacitive touch screen adopts dense horizontal and vertical transparent conductive lines, and realizes positioning through the detection of capacitive effect. The effect is ideal, but because of the complexity and cost, it can only be used for small devices such as mobile phones; Adding a pressure-sensitive film to a solid whiteboard is costly and easy to damage, and because it needs to be triggered by pressure, the hand feel is poor; the infrared frame-type whiteboard is prone to light interference, and the cost increases, the resolution decreases, and the anti-interference becomes worse when the size is large; Lateral image tracking and cross-positioning whiteboards are prone to light interference, and because the two camera devices need to be installed at a long distance, it is more complicated, costly, and requires high flatness of the board surface

Method used

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  • Touch screen adopting capacitive touch detection and real-time image positioning
  • Touch screen adopting capacitive touch detection and real-time image positioning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] see figure 1 A touch screen that adopts capacitive touch detection and real-time image positioning, the touch screen includes a display screen 1, which is a flat panel display, such as a 52-inch liquid crystal display; a camera 2 that is arranged on the top of the front of the display 1 and shoots the display screen , the camera 2 can adopt a common USB camera, and its image can be directly transmitted to a computer through a USB interface for image analysis; an infrared emission tube 3 is arranged near the camera, and the infrared light emitting tube is set to an infrared LED of 850nm. The lens is provided with a corresponding band-pass filter for passing infrared light, thereby filtering out visible light. The above-mentioned infrared emission tube is installed near the camera, and near the center of the screen, so as to facilitate the formation of shadows and obvious boundary lines at the fingertips, which is convenient for tip detection; the touch detection circuit ...

Embodiment 2

[0025] see figure 1 with figure 2 , as an improvement of the present invention, a touch indication light emitter 7 is introduced, which is connected to the capacitive touch detection circuit and driven by it, and makes the touch indication light emitter 7 emit light when a touch signal is detected, otherwise it goes out, thereby passing The image output by the camera can obtain the touch state information. The touch indication light emitter 7 is installed at the midpoint of the upper edge of the display screen, so that the camera can photograph the light emitter without being easily blocked.

Embodiment 3

[0027] see figure 1 , a method for realizing a touch screen, characterized in that the method includes the following steps: (1) image capture, under the illumination of a light-emitting device, the image of the display screen is collected by a camera, and the collected image is transmitted to a computer or a processing circuit (2) analyze the above-mentioned output image to obtain the touch position; (3) detect the capacitance change of the conductive film on the display surface, if it is greater than a certain threshold, then output a specific level to indicate the touch state; (4) detect the capacitance The output result and the touch position data obtained by image analysis are input into the computer at the same time; (5) Determine the touch action according to the above data.

[0028] As an improvement, the touch state can be represented by the lighting and extinguishing of the luminous tube, and read by the camera.

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PUM

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Abstract

The invention relates to a touch screen adopting capacitive touch detection and real-time image positioning. The touch screen adopting capacitive touch detection and real-time image positioning comprises a displayer and is characterized by further comprising a camera arranged above the front portion of the displayer and shoots the surface of a display screen of the displayer, the display screen of the displayer is attached with a conductive thin film, a conductive layer of the conductive thin film is connected to a capacitance touch detecting circuit, the capacitance touch detecting circuit comprises a singlechip, and an output of the singlechip is connected to a computer interface circuit or drives a touch instruction light projector. Compared with the prior art, the touch screen adopting capacitive touch detection and real-time image positioning is provided with touch feel and sensitivity of existing capacitive touch screens, can simultaneously achieve large scale touch screen, front image collection is adopted, and accordingly the problem of lateral ray interference existing in the prior art such as infrared frame technology is solved. A single camera, especially a cheap universal serial bus (USB) camera can be adopted, circuit is simplified, mounting is simple, cost is low, evenness requirements on the display screen is low, and cost is further reduced.

Description

technical field [0001] The invention relates to a touch screen, in particular to a touch screen and a method thereof which adopt capacitance detection to realize touch detection and real-time image analysis to realize coordinate positioning. Background technique [0002] As an electronic device integrating display and interactive input, the touch screen has more and more applications. From small personal mobile devices to large electronic whiteboards, touch screen technology is used. In small devices, the current most mainstream technology is the capacitive touch screen represented by the iPhone. In large-scale electronic whiteboards, pressure-sensitive positioning, infrared emission and receiving tube array positioning, and lateral image tracking cross positioning are mainly used. Touch operation. Each of these techniques has its own inherent drawbacks and limitations. The capacitive touch screen adopts dense horizontal and vertical transparent conductive lines, and real...

Claims

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Application Information

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IPC IPC(8): G06F3/044G06F3/042
Inventor鲍炜
OwnerNANJING FANGRUI TECH