Wireless display systems and stylii
First Claim
1. A stylus comprising:
- a stylus tip;
a first ultrasonic transmitter controllable by application of pressure to the stylus tip;
a second ultrasonic transmitter;
a first switch to control the second ultrasonic transmitter; and
a higher frequency transmitter to provide a time reference for the first and second ultrasonic transmitters;
wherein the stylus is to use with a wireless display system having a projection plane and at least three ultrasonic receivers, wherein the first ultrasonic transmitter is to transmit ultrasonic energy to at least two of the ultrasonic receivers in determining a position of the stylus relative to the projection plane in two dimensions, and wherein the second ultrasonic transmitter is to transmit ultrasonic energy to at least three ultrasonic receivers in determining a position of the stylus relative to the projection plane in three dimensions.
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Accused Products
Abstract
A wireless coordinate input system for a display system includes a stylus that transmits ultrasonic energy to a plurality of ultrasonic receiving stations in a projection plane. In an embodiment, the stylus may include one ultrasonic transmitter used for determination of three-dimensional coordinates of the stylus relative to the projection plane. The stylus may also include a second ultrasonic transmitter controlled by a pressure-activated switch. When the stylus is pressed against the projection plane, the second transmitter turns on and is used for determination of two-dimensional coordinates of the stylus in the projection plane. The stylus may also include a higher frequency burst transmitter used to generate a time reference. One or more of the ultrasonic receiving stations may also include an ultrasonic transmitter for calibration.
30 Citations
23 Claims
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1. A stylus comprising:
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a stylus tip; a first ultrasonic transmitter controllable by application of pressure to the stylus tip; a second ultrasonic transmitter; a first switch to control the second ultrasonic transmitter; and a higher frequency transmitter to provide a time reference for the first and second ultrasonic transmitters; wherein the stylus is to use with a wireless display system having a projection plane and at least three ultrasonic receivers, wherein the first ultrasonic transmitter is to transmit ultrasonic energy to at least two of the ultrasonic receivers in determining a position of the stylus relative to the projection plane in two dimensions, and wherein the second ultrasonic transmitter is to transmit ultrasonic energy to at least three ultrasonic receivers in determining a position of the stylus relative to the projection plane in three dimensions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A wireless display system comprising:
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at least three ultrasonic receivers mountable at different locations on a projection surface; a stylus comprising a first ultrasonic transmitter to transmit ultrasonic energy to the ultrasonic receivers, a second ultrasonic transmitter to transmit ultrasonic energy to the receivers, wherein the first and second ultrasonic transmitters are to transmit ultrasonic energy at different frequencies, wherein two-dimensional position coordinates of the stylus are to be determined when ultrasonic energy is received by the receivers at a first frequency, and wherein three-dimensional position coordinates of the stylus are to be determined when ultrasonic energy is received by the receivers at a second frequency; and a computer coupled to the ultrasonic receivers, wherein the computer is to determine the two-dimensional and three-dimensional position coordinates of the stylus relative to the projection surface. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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Specification