Through display ultrasonic touch-screen monitor

1. A method of detecting an object, comprising:

sending, with an ultrasonic sensor, ultrasonic waves through a display TFT pixel array to the object, which is in contact with a protective platen, wherein the display TFT pixel array resides between the protective platen and the ultrasonic sensor;

detecting, with the ultrasonic sensor, reflected ultrasonic energy sent through the display TFT pixel array for detection of the object;

producing, with the ultrasonic sensor, output signals corresponding to the detected reflected ultrasonic energy;

comparing, with a control system in communication with the ultrasonic sensor, the output signals from the ultrasonic sensor; and

determining differences between output signals produced at different times based on the compared output signals.

2. The method of claim 1 , wherein the ULTRASONIC SENSOR includes:

an ultrasonic wave generator;

a piezoelectric receiver; and

an ultrasonic TFT receiver array.

3. The method of claim 1 , further comprising interpreting, with the control system, the differences between the output signals as movement of the object.

4. The method of claim 1 , further comprising determining, with the control system, a location of the object.

5. The method of claim 1 , wherein the protective platen includes a polymeric material.

6. The method of claim 1 , wherein the protective platen includes a silane material.

7. The method of claim 1 , wherein the protective platen includes a ceramic material.

8. The method of claim 1 , wherein the protective platen includes glass.

9. The method of claim 1 , further comprising

modifying, with a signal processor, the output signals to compensate for variations in ultrasonic transmissivity.

10. A touch-screen monitor, comprising:

an ultrasonic sensor;

a protective platen;

a display TFT pixel array residing between the protective platen and the ultrasonic sensor; and

a control system in communication with the ultrasonic sensor, wherein:

the ultrasonic sensor is configured to generate ultrasonic waves that pass through the display TFT pixel array to an object in contact with the protective platen, and wherein the ultrasonic sensor is configured to detect reflected ultrasonic energy passed through the display TFT pixel array to the ultrasonic sensor for detection of the object on the platen and to produce output signals corresponding to the detected reflected ultrasonic energy, and

the control system is configured to compare the output signals from the ultrasonic sensor and determine differences between output signals produced at different times.

11. The touch-screen monitor of claim 10 , wherein the ultrasonic sensor includes:

an ultrasonic wave generator;

a piezoelectric receiver; and

an ultrasonic TFT receiver array.

12. The touch-screen monitor of claim 10 , wherein the control system is configured to interpret the differences between output signals as movement of the object.

13. The touch-screen monitor of claim 10 , wherein the control system is configured to determine a location of the object.

14. The touch-screen monitor of claim 10 , wherein the protective platen includes a polymeric material.

15. The touch-screen monitor of claim 10 , wherein the protective platen includes a silane material.

16. The touch-screen monitor of claim 10 , wherein the protective platen includes a ceramic material.

17. The touch-screen monitor of claim 10 , wherein the protective platen includes glass.

18. The touch-screen monitor of claim 11 , further comprising a signal processor configured to modify the output signals to compensate for variations in ultrasonic transmissivity.

19. A system for detecting an object, comprising:

means for sending ultrasonic waves through a display TFT pixel array to an object in contact with a protective platen, wherein the display TFT pixel array resides between the protective platen and the ultrasonic sensor;

means for detecting reflected ultrasonic energy sent through the display TFT pixel array for detection of the object in contact with the protective platen;

means for producing output signals corresponding to the detected reflected ultrasonic energy;

means for comparing the output signals from the ultrasonic sensor; and

means for determining differences between output signals produced at different times based on the compared output signals.

20. The system of claim 19 , further comprising:

means for modifying the output signals to compensate for attenuation differences imposed by variations in ultrasonic transmissivity.