Claims
- 1. A method for generating coordinate signals in conjunction with the surface of a member comprising the steps of:
- providing a first ultrasonic wave packet to said member;
- receiving with a stylus positioned proximate to said member said first ultrasonic wave packet;
- transmitting to said member with said stylus a second ultrasonic wave packet responsive to said first ultrasonic wave packet;
- receiving from said member, with a plurality of piezoelectric point elements coupled to said member said second ultrasonic wave packet; and determining an x-position and y-position of said stylus responsive to said received second ultrasonic wave packet;
- wherein said first ultrasonic wave packet is received by piezoelectric material contained in said stylus; said stylus piezoelectric material converting said first ultrasonic wave packet into an electrical charge and thereafter converting said electrical charge into said second ultrasonic wave packet.
- 2. The method in accordance with claim 1 wherein said first ultrasonic wave packet is provided by a piezoelectric point element.
- 3. A method for generating coordinate signals in conjunction with a surface of a field emission device having a cathode plate coupled to an anode plate, comprising the steps of:
- providing a first ultrasonic wave packet to said anode plate;
- receiving with a stylus positioned proximate to said anode plate said first ultrasonic wave packet;
- transmitting to said anode plate with said stylus a second ultrasonic wave packet responsive to said first ultrasonic wave packet;
- receiving from said anode plate, with a plurality of piezoelectric point elements, said second ultrasonic wave packet; and
- determining an x-position and y-position of said stylus responsive to said received second ultrasonic wave packet;
- wherein said first ultrasonic wave packet is received by piezoelectric material contained in said stylus; said stylus piezoelectric material converting said first ultrasonic wave packet into an electrical charge and thereafter converting said electrical charge into said second ultrasonic wave packet.
- 4. The method in accordance with claim 3 wherein said first ultrasonic wave packet is provided by piezoelectric material.
- 5. The method in accordance with claim 3 further including the step of sending said position data to a host processor.
- 6. The method in accordance with claim 5 further including the step of displaying a video image on said field emission display in response to said determination.
RELATED APPLICATION
This application includes subject matter which is related to U.S. patent application Ser. No. 08/429,373, "Integration of Pen-based Capability Into a Field Emission Device System Using Piezoelectric Stripes," (Texas Instruments, Inc.), filed Apr. 26, 1995. In addition, this application includes subject matter which is related to U.S. patent application Ser. No. 08/429,371, "Method For Integrating Pen-Based Capability Into a Field Emission Device System Using Piezoelectric Stripes," (Texas Instruments, Inc.), filed Apr. 26, 1995. Furthermore, this application includes subject matter which is related to U.S. patent application Ser. No. 08/429,369, "Determination of Pen Location on Display Apparatus Using Piezoelectric Elements,"(Texas Instruments), filed Apr. 26, 1995.
US Referenced Citations (16)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0107922 |
May 1984 |
EPX |
0083126 |
May 1985 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Pen Expo "93, Boston, MA, Masahiko Yamada, "Optimum Pen Design and Phase Switch Technology for High Speed Data Capture," pp. 1-6, Aug. 30, 1993-Sep. 3, 1993. |