Methods and systems of vibrating a screen
View Patent ↗Screen vibration systems are provided that can vibrate theater screens using acoustical, electromagnetic, or another type of energy while reducing the presence of image artifacts that may otherwise be visible as result of vibrating the screen. In one example of a screen vibration system, the system includes a screen, a permanent magnet mounted to the screen, and a magnetic source positioned with respect to the permanent magnet and uncoupled from the screen. The screen is moveable in response to a changing magnetic field from the magnetic source.
1. A screen vibration system, comprising:
a plurality of vibrator assemblies positionable proximate to a surface area of a screen on which images are displayed, the plurality of vibrator assemblies being configured to displace the screen,
wherein a position of at least one vibrator assembly of the plurality of vibrator assemblies is adjustable based on a change in screen location from screen sag.
2. The screen vibration system of claim 1 , wherein the at least one vibrator assembly is moveable by a pantograph mechanism to change the position of the at least one vibrator assembly.
3. The screen vibration system of claim 1 , wherein the position of each vibrator assembly of the plurality of vibrator assemblies with respect to the screen is adjustable independent of other vibrator assemblies of the plurality of vibrator assemblies.
4. The screen vibration system of claim 1 , wherein the plurality of vibrator assemblies is configured to vibrate the screen such that an average displacement of the screen during vibration is the same location of the screen in a natural rest state.
5. The screen vibration system of claim 1 , wherein the plurality of vibrator assemblies comprise a plurality of electromagnetic actuator assemblies configured for displacing at least some portions of the screen by vibrating and causing the portions of the screen to move.
6. The screen vibration system of claim 5 , wherein the plurality of vibrator assemblies is configured to cause a direction of displacement to the screen such that at least some portions of the screen are repelled from the plurality of vibrator assemblies or attracted to the plurality of vibrator assemblies.
7. The screen vibration system of claim 5 , wherein each electromagnetic actuator assembly of the plurality of electromagnetic actuator assemblies includes a coil through which an electrical current is transmittable for creating a magnetic field to repel or attract an element that is influenced by the magnetic field to cause the screen to be displaced.
8. The screen vibration system of claim 5 , wherein each electromagnetic actuator assembly of the plurality of electromagnetic actuator assemblies includes an electromechanical transducer with a diaphragm that is movable electromechanically to cause the screen to be displaced.
9. The screen vibration system of claim 5 , wherein each electromagnetic actuator assembly includes a magnetic source positionable with respect to the screen for providing a magnetic force to which an element is responsive by being repelled or attracted to cause the screen to be displaced.
10. The screen vibration system of claim 1 , further comprising:
a platform with a moveable portion on which the at least one vibrator assembly of the plurality of vibrator assemblies is coupled; and
a controller assembly configured for causing the movable portion of the platform to move and change the position of the at least one vibrator assembly of the plurality of vibrator assemblies.
11. The screen vibration system of claim 10 , wherein the platform includes a stationary portion that is mountable to a screen support structure.
12. The screen vibration system of claim 11 , wherein the position of the at least one vibrator assembly of the plurality of vibrator assemblies is automatically adjustable based on a change over time in screen location from screen sag.
13. The screen vibration system of claim 12 , further comprising:
a distance sensor coupled on the at least one vibrator assembly and configured for providing distance information that comprises a distance between the at least one vibrator assembly and the screen,
wherein the controller assembly is configured to receive the distance information and cause the position of the at least one vibrator assembly of the plurality of vibrator assemblies to change to maintain the distance within a distance range automatically.
14. The screen vibration system of claim 13 , wherein the controller assembly includes a motor driver that is configured to control a platform actuator for causing the movable portion of the platform to move.
15. A method for vibrating a screen, the method comprising:
driving a vibrator assembly, located behind the screen, using an electric signal to vibrate the screen;
automatically changing a position of the vibrator assembly behind the screen to a new position, based on a change in a screen location of at least a portion of the screen from screen sag; and
driving the vibrator assembly located at the new position to vibrate the screen.
16. The method of claim 15 , further comprising:
automatically changing positions with respect to the screen of each vibrator assembly of a plurality of vibrator assemblies independent of other vibrator assemblies of the plurality of vibrator assemblies.
17. The method of claim 16 , further comprising:
vibrating the screen by the plurality of vibrator assemblies such that an average displacement of the screen during vibration is the same location of the screen in a natural rest state.
18. The method of claim 17 , wherein vibrating the screen by the plurality of vibrator assemblies includes causing a direction of displacement to the screen such that at least some portions of the screen are repelled from the plurality of vibrator assemblies or attracted to the plurality of vibrator assemblies.
19. The method of claim 15 , further comprising:
providing, by a distance sensor coupled to the vibrator assembly, distance information that comprises a distance between the vibrator assembly and the screen; and
causing the position of the vibrator assembly to change to maintain the distance within a distance range automatically.
20. The method of claim 19 , further comprising:
controlling a platform actuator for causing a movable portion of a platform coupled to the vibrator assembly to move to change the position of the vibrator assembly.
21. A system, comprising:
a screen having a surface on which images are displayable, the screen being susceptible to screen sag that changes a location of a least part of the screen; and
a vibrator assembly positioned with respect to a side of the screen that is opposite to the surface on which images are displayable, the vibrator assembly comprising an actuator for vibrating at least a portion of the screen, the vibrator assembly being moveable to change a position of the vibrator assembly with respect to the screen in response to the portion of the screen changing location as a result of screen sag.
22. The system of claim 21 , wherein the vibrator assembly is a plurality of vibrator assemblies, wherein the position of each vibrator assembly of the plurality of vibrator assemblies with respect to the screen is adjustable independent of other vibrator assemblies of the plurality of vibrator assemblies.
23. The system of claim 22 , wherein the plurality of vibrator assemblies is configured to vibrate the screen such that an average displacement of the screen during vibration is the same location of the screen in a natural rest state.
24. The system of claim 22 , wherein the plurality of vibrator assemblies comprise a plurality of electromagnetic actuator assemblies configured for displacing at least some portions of the screen by vibrating and causing the portions of the screen to move.
25. The system of claim 24 , wherein each electromagnetic actuator assembly of the plurality of electromagnetic actuator assemblies includes a coil through which an electrical current is transmittable for creating a magnetic field to repel or attract an element that is influenced by the magnetic field to cause the screen to be displaced.
26. The system of claim 24 , wherein each electromagnetic actuator assembly of the plurality of electromagnetic actuator assemblies includes an electromechanical transducer with a diaphragm that is movable electromechanically to cause the screen to be displaced.
27. The system of claim 24 , wherein each electromagnetic actuator assembly includes a magnetic source positionable with respect to the screen for providing a magnetic force to which an element is responsive by being repelled and attracted to cause the screen to be displaced.
28. The system of claim 21 , further comprising:
a platform with a moveable portion on the vibrator assembly is coupled; and
a controller assembly configured for causing the movable portion of the platform to move and change the position of the vibrator assembly.
29. The system of claim 28 , further comprising:
a distance sensor coupled on the vibrator assembly that includes the actuator, the distance sensor being configured for providing distance information that comprises a distance between the vibrator assembly and the screen,
wherein the controller assembly is configured to receive the distance information and cause the position of the vibrator assembly to change to maintain the distance within a distance range automatically.
30. The system of claim 21 , further comprising a laser projector configured for projecting the images for display on the surface of the screen,
wherein the vibrator assembly is configured to reduce speckle in the images displayed on the surface of the screen by vibrating at least part of the screen.