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Optical position input system and method

An input system and optical technology, applied in the field of optical position input systems and methods, can solve problems such as errors, position accuracy changes, and inability to guarantee multiple touch resolutions.

Active Publication Date: 2016-03-02
OMNIVISION TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such systems cannot guarantee resolution for multiple touches (i.e., more than one pointer), and their positional accuracy is touch-dependent relative to a triangulated baseline.
Such systems are also affected by motion outside the touch area and may report false positions

Method used

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  • Optical position input system and method
  • Optical position input system and method
  • Optical position input system and method

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Experimental program
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Embodiment Construction

[0021] Figure 1A An exemplary optical position input system 100 is shown with three imaging modules 102(A)-102(C) forming a triangle. Although an equilateral triangle is shown in the drawing, the shape of the triangle is not limited to an equilateral triangle. Each imaging module 102(A)-102(C) includes an optical sensor array 104(A)-104(C), each optical sensor array 104(A)-104(C) has a Fields of view 106(A)-106(C) of points 107(A)-107(C). The imaging module 102 is disposed around the active touch area 108 to acquire images of multiple pointers (eg, pointers M and N) in the active touch area 108 . The active touch area 108 has a coordinate system 109 that has a defined direction relative to the operation of the active touch area 108, and the coordinates (i.e., X and Y coordinates) of the reference points 107(A)-107(C) are relative to the coordinate system 109 determined. Although two indicators are shown, the system 100 may operate with fewer or more indicators.

[0022] A...

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Abstract

The present invention provides an optical position input system for determining at least one pointer within an active touch area. The optical position input system includes at least three imaging modules and a processor; wherein, the at least three imaging modules form an image of at least one pointer located in the effective touch area; and the processor, according to the images formed by the at least three imaging modules, A position of each of the at least one indicator is calculated.

Description

Background technique [0001] Currently, touch screens are used in automated teller machines (ATMs) and other interactive devices. The user generally interacts with the screen of the input device of the ATM through a pen or a finger. At present, other input devices of a computer, such as a handwriting pad or an input pad, can also be used. For example, handwriting tablets are widely used for writing characters such as language words. Some input devices may require special pointing objects such as special pens, which may not be as convenient as fingers. [0002] Input devices may also be required on large touchscreens, which are often set up as whiteboards that are often used in conference rooms or classrooms. In order to record the written content on the whiteboard, a linear sensor can be used to scan the whiteboard to record the written content. After a while, the motion of the sensor relative to the board may be erratic and unreliable. Other methods of reading and writing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/042
CPCG06F3/0428
Inventor 李进刘冠松吴东辉单继章
Owner OMNIVISION TECH INC