Touch device and touch projection system using the same
First Claim
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1. A touch device, comprising:
- a light guide unit having at least one light incident surface and a first surface connected to the light incident surface;
a light emitting unit disposed beside the light incident surface and capable of emitting an invisible light beam, wherein the invisible light beam enters the light guide unit from the light incident surface and is transmitted in the light guide unit;
an invisible light filter contacted tightly with the first surface, corresponding to a size of the first surface, and capable of blocking an ambient light beam from entering the touch device, wherein the ambient light beam has a wavelength distribution which substantially corresponds to a wavelength distribution of the invisible light beam;
an invisible light detector capable of detecting the invisible light beam, and the light guide unit disposed between the invisible light filter and the invisible light detector; and
at least one shading unit located above and at an edge of the first surface without contacting physically the light emitting unit, and the invisible light filter is disposed between the shading unit and the first surface, wherein the shading unit is directly contacted with the invisible light filter.
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Abstract
A touch device including a light guide unit, a light emitting unit, an invisible light filter and an invisible light detector is provided. The light guide unit has at least one light incident surface and a first surface connected to the light incident surface. The light emitting unit is disposed beside the light incident surface and is capable of emitting an invisible light beam. The invisible light filter is contacted tightly with the first surface. The light guide unit is disposed between the invisible light filter and the invisible light detector. Moreover, a touch projection system including the touch device is also provided.
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Citations
15 Claims
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1. A touch device, comprising:
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a light guide unit having at least one light incident surface and a first surface connected to the light incident surface; a light emitting unit disposed beside the light incident surface and capable of emitting an invisible light beam, wherein the invisible light beam enters the light guide unit from the light incident surface and is transmitted in the light guide unit; an invisible light filter contacted tightly with the first surface, corresponding to a size of the first surface, and capable of blocking an ambient light beam from entering the touch device, wherein the ambient light beam has a wavelength distribution which substantially corresponds to a wavelength distribution of the invisible light beam; an invisible light detector capable of detecting the invisible light beam, and the light guide unit disposed between the invisible light filter and the invisible light detector; and at least one shading unit located above and at an edge of the first surface without contacting physically the light emitting unit, and the invisible light filter is disposed between the shading unit and the first surface, wherein the shading unit is directly contacted with the invisible light filter. - View Dependent Claims (2, 3, 4, 5)
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6. A touch projection system, comprising:
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a projection unit capable of providing an image light beam to a screen and; a touch device disposed on a transmitting path of the image light beam, comprising; a light guide unit having at least one light incident surface and a first surface connected to the light incident surface; a light emitting unit disposed beside the light incident surface and capable of emitting an infrared light beam, wherein the infrared light beam enters the light guide unit from the light incident surface and is transmitted in the light guide unit; an invisible light filter contacted tightly with the first surface, corresponding to a size of the first surface, and capable of blocking an ambient light beam from entering the touch device, wherein a plurality of optical films are laminated to form the invisible light filter, wherein the ambient light beam has a wavelength distribution, which substantially corresponds to a wavelength distribution of the infrared light beam, a transmission rate of the infrared light beam detected on a surface at the opposite side of the first surface of the light guide unit ranges between substantially 30% and 50% when a user touches the invisible light filter; and an invisible light detector capable of detecting the infrared light beam, the light guide unit disposed between the invisible light filter and the invisible light detector. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification