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Optical touch screen systems using reflected light

A touch screen, screen technology, applied in the input/output process of data processing, instruments, calculations, etc., can solve the problem that accuracy depends on capacitance, surface capacitive touch screen RF interference EM interference, touch screen is not suitable for small mobile devices and Devices with large screens are commonly used and other issues to achieve low-cost effects

Inactive Publication Date: 2012-03-14
NEONODE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The downside of projected capacitive touch screens is that the screen is not completely transparent due to the overlay
Another downside is their high cost
Another disadvantage is the limited operating temperature range
Another downside is the limited capture speed due to the capacitive nature of the touchscreen
Another downside is the limited screen size, usually less than 5 inches
Another disadvantage is that surface capacitive touch screens are susceptible to RF interference and EM interference
Yet another disadvantage is that the accuracy of touch location determination depends on capacitance
[0014] It should thus be recognized that conventional touch screens are not suitable for the ubiquitous use of small mobile devices and devices with large screens

Method used

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  • Optical touch screen systems using reflected light
  • Optical touch screen systems using reflected light
  • Optical touch screen systems using reflected light

Examples

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Embodiment Construction

[0123] Various aspects of the invention relate to light-based touch screens and light-based touch surfaces. According to various embodiments of the present invention, a light-based touch screen includes one or more infrared or near-infrared light emitting diodes (LEDs) and a plurality of photodiodes (PDs) arranged along a perimeter around the touch screen or touch surface. The LEDs project light substantially parallel to the screen surface and this light is detected by the PD. A pointer such as a finger or a stylus placed over a part of the screen blocks some of the light beams and accordingly some PDs monitor lower light intensities. The geometry of the PD positions and the light intensity they detect are sufficient to determine the screen coordinates of the pointer. LEDs and PDs are controlled to be selectively activated and deactivated by the controller. Typically, each LED and PD has an I / O connector, and a signal is passed to indicate which LED and which PD is activated...

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PUM

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Abstract

A touch screen system, including a near-infrared transparent screen including a plurality of reflective elements embedded therein, a circuit board including circuitry for controlled selective activation of electronic components connected thereto, at least one light source connected to the circuit board, for emitting light, and at least one light detector connected to the circuit board, for detecting light emitted by the at least one light source and reflected by the reflective elements.

Description

technical field [0001] The field of the invention is light based touch screens. Background technique [0002] Many consumer electronic devices are now built with touch-sensitive screens that are touched by a finger or stylus for user input. These devices range from small screen devices such as mobile phones and car entertainment systems to medium sized screen devices such as notebook computers to large screen devices such as check-in stations at airports. [0003] Most traditional touch screen systems are based on resistive or capacitive layers. Such systems are not general enough to provide an all-inclusive solution because their specifications cannot be easily changed. [0004] Referring to FIG. 1, FIG. 1 is a prior art illustration of a conventional touch screen system. Such a system includes an LCD display surface, a resistive or capacitive overlay placed over the LCD display surface, and a controller integrated circuit (IC) connected to the overlay and receiving inp...

Claims

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Application Information

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IPC IPC(8): G06F3/042
CPCG06F3/0421G06F3/042G06F3/0425G06F3/0428G06F2203/04101G06F2203/04109
Inventor 芒努斯·格尔茨托马斯·埃里克松约瑟夫·沙因
Owner NEONODE
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