Flexible members for moving screens in display systems

Abstract

For reducing artificial effects, especially the speckle effects, in display systems employing light valves, a movable screen is provided in the display system. The screen motion is enabled by attaching the screen to flexible elements that are connected to non-movable member of the display system.

1 . A screen for use in a display system, wherein the screen is attached to a flexible element that holds the screen and a screen driver that moves the screen. 
   
   
       2 . The screen of  claim 1 , wherein the flexible element is connected to the screen and a fixed member of the display system. 
   
   
       3 . The screen of  claim 2 , wherein the fixed member is a cabinet of the display system. 
   
   
       4 . The screen of  claim 1 , wherein the flexible element comprises at least one spring rod. 
   
   
       5 . The screen of  claim 4 , wherein the screen driver is capable of moving the screen at a frequency determined based upon a resonant frequency of the spring rod and screen. 
   
   
       6 . The screen of  claim 4 , wherein the screen driver is capable of moving the screen at a frequency lower than 7 Hz or higher than 30 Hz. 
   
   
       7 . The screen of  claim 1 , further comprising an actuator attached to the screen for moving the screen. 
   
   
       8 . The screen of  claim 1 , further comprising first and second actuators; wherein the first and second actuators are disposed such that first and second forces generated by the first and second actuators are applied to the screen along first and second directions that are perpendicular and pass through a mass center of the screen. 
   
   
       9 . The screen of  claim 4 , wherein the screen is held by a screen frame that is connected to one end of the spring rod; and wherein the other end of the spring rod is securely anchored at a fixed member of the display system. 
   
   
       10 . The screen of  claim 1 , wherein the flexible element is a co-axial spring rod. 
   
   
       11 . The screen of  claim 1 , wherein the screen is held by a set spring rods that are deployed around the parameter of a screen frame that holds the screen. 
   
   
       12 . The screen of  claim 1 , wherein the flexible elements are connected to the screen such that a motion of the screen along the normal direction of the screen is absent. 
   
   
       13 . The screen of  claim 4 , wherein the spring rod is substantially rigid along the length of the spring rod. 
   
   
       14 . A method of displaying an image, comprising:
 producing an image on a screen; and   moving the screen relative to a viewer of the image using a flexible element and a screen driver, further comprising:
 holding the screen by the flexible element; and 
 moving the screen relative to the viewer by the screen driver. 
   
   
   
       15 . The method of  claim 14 , wherein the step of moving the screen further comprises:
 moving the screen such that a mass center of the screen moved relative to the viewer; while the screen substantially does not tilt or rotate around the mass center.   
   
   
       16 . The method of  claim 14 , wherein the screen is substantially not moved along a normal direction of the screen. 
   
   
       17 . The method of  claim 14 , wherein the screen moves circularly at a frequency lower than 7 Hz or higher than 30 Hz. 
   
   
       18 . The method of  claim 14 , wherein the maximum displacement of the screen during moving is equal to or less than 5 mm. 
   
   
       19 . The method of  claim 15 , further comprising:
 applying first and second forces to the screen, wherein the first and second forces are applied along first and second directions that are perpendicular and pass through a mass center of the screen.   
   
   
       20 . The method of  claim 19 , wherein the first and second forces are substantially in a plane of the screen. 
   
   
       21 . The method of  claim 20 , wherein the first and second forces are applied by first and second actuators; and wherein the screen is held by a plurality of spring rods that are attached to a fixed member of the display system. 
   
   
       21 . A display system, comprising:
 a light valve comprising an array of individually addressable pixels;   a screen attached to and held by a flexible element;   a moving mechanism attached to the screen for moving the screen; and   a set of optical elements for directing light from the light valve onto the screen.   
   
   
       22 . The display system of  claim 21 , wherein the flexible element is an elongated element; wherein the flexible element is rigid along the length; and is flexible in at least a direction perpendicular to the length. 
   
   
       23 . The display system of  claim 22 , wherein the flexible element is an elongated spring rod. 
   
   
       24 . The display system of  claim 21 , wherein the moving mechanism comprises a voice coil comprising a movable member connected to a screen frame that holds the screen. 
   
   
       25 . The display system of  claim 21 , wherein the flexible element has an intrinsic resonant frequency of lower than 7 Hz or higher than 30 Hz.