| 摘要 |
A guide light plate optical touch device comprises a guide light plate, an image capturing unit, an optical signal emitting unit, a microprocessor, and an optical signal processing unit; when the guide light plate is touched, at least two lights passing though the touch point carry newly generated low frequency vibration signals or further generate FTIR signals such that the optical signal processing unit obtains at least two unusual signal values; then the microprocessor detects the signal values sequentially output by the optical signal processing unit in a period and obtains the location information of the touch point based on the time points appearing in the period with respect to the two unusual signal values so as to output a corresponding touch signal. |
| 主权项 |
1. A guide light plate optical touch device, comprising:
a guide light plate having a peripheral surface, a lower surface and an upper surface with an operation zone; at least a strip-shaped retro-reflector; at least a strip-shaped reflection films; a microprocessor; an optical signal emitting unit disposed near a corner of the guide light plate; an image capturing unit disposed near said optical signal emitting unit, and including a photosensitive array and a lens, the photosensitive array providing a plurality of photosensitive units; an optical signal processing unit electrically connecting with said microprocessor and said image capturing unit, detecting signals output by the photosensitive units, processing the signals and obtaining a plurality of signal values corresponding to the signals of the photosensitive units, and transmitting the signal values to the microprocessor; wherein at least one of said retro-reflectors and one of said reflector films are disposed at the peripheral surface of the guide light plate to guide lights emitted by said optical signal emitting unit into the guide light plate, retro-reflect the lights toward the optical signal emitting unit, and further guide the light into the image capturing unit; when the operation zone on the upper surface of the guide light plate is touched, at least two of the photosensitive units of said photosensitive array sense at least two lights passing through a touch point and output an newly generated low frequency vibration signal respectively, or generating at least one of FTIR signals to allow the optical signal processing unit to obtain two unusual signal values; the microprocessor detects the signal values output by the optical signal processing unit sequentially in a period and obtains location information of the touch point based on time points corresponding to the two unusual signal values appearing in the period, and outputs a corresponding touch signal. |
