Projection display device with a projection module

Abstract

A front projection display device having a projection module and a docking station. The docking station has a base. Further, the docking station can include an extendable arm attached to the base. The projection module contains an optical engine. The optical engine includes an illumination system, an imaging system, and a wide-angle projection lens. The optical engine outputs an image at a half field angle of at least 45°. The projected image has substantially no distortion and requires substantially no keystone correction.

1 . A front projection display device comprising: 
 a projection module to provide an extreme off-axis image to a viewing surface; and    a docking station configured to receive the projection module.    
   
   
       2 . The device of  claim 1 , wherein the docking station comprises a base and an extendable arm attached to the base.  
   
   
       3 . The device of  claim 1 , wherein the projection module comprises an optical engine comprising: 
 an illumination system;    an imaging system; and    a wide angle projection lens,    wherein the optical engine outputs the image at a half field angle of at least 45° and wherein the image has substantially no distortion and requires substantially no keystone correction.    
   
   
       4 . The device of  claim 3 , wherein the wide angle projection lens comprises the following components in sequential order from a screen side: 
 a first lens group of negative refractive power, the first lens group having at least one aspheric surface;    a second lens group of substantially zero refractive power and wherein an aperture stop lies within or near the second lens group; and    a third lens group of positive refractive power,    wherein the following Conditions (1) to (3) are satisfied:        |F   1 /F|<4.0   Condition (1)    |F   2 /F|>50   Condition (2)    |F   3 /F|<3.5   Condition (3)    where    F is the focal length of the wide-angle projection lens;    F 1  is the focal length of the first lens group;    F 2  is the focal length of the second lens group; and    F 3  is the focal length of the third lens group.    
   
   
       5 . The device of  claim 2 , wherein the extendable arm comprises 
 power lines to provide power to the projection module; and    a communications line for communicating between the projection module and a computer.    
   
   
       6 . The device of  claim 5 , wherein the extendable arm further comprises a connection to provide at least one of a wired and a wireless network connection.  
   
   
       7 . The device of  claim 1 , wherein the projection module has a throw distance of less than about one meter.  
   
   
       8 . The device of  claim 1 , wherein the projection module further comprises a handle.  
   
   
       9 . The device of  claim 1 , wherein the projection module further comprises an expansion module.  
   
   
       10 . The device of  claim 2 , wherein the extendable arm comprises one of a telescopic arm and a flexible arm.  
   
   
       11 . The device of  claim 10 , wherein the extendable arm comprises a flexible arm having a hinged elbow located between a first arm portion and a second arm portion.  
   
   
       12 . The device of  claim 11 , wherein the second arm portion has a length that can be adjusted.  
   
   
       13 . The device of  claim 11 , wherein the second arm portion provides lateral movement.  
   
   
       14 . The device of  claim 2 , wherein the base of the docking station is mounted to one of a fixed wall, a moveable wall, and a board.  
   
   
       15 . The device of  claim 2 , wherein the docking station further comprises a dock located distal to the base.  
   
   
       16 . The device of  claim 15 , wherein the projection module is mateable to the dock by a twisting motion.  
   
   
       17 . A mobile media station comprising: 
 a cart;    a screen attachable to the cart; and    a projection display device disposed on the cart to provide an image to the screen, the device comprising: 
 a projection module to project the image; and  
 a docking station to receive the projection module.  
   
   
   
       18 . The mobile media station of  claim 17 , wherein the projection module comprises an optical engine comprising: 
 an illumination system;    an imaging system; and    a wide-angle projection lens,    wherein the optical engine outputs an image at a half field angle of at least 45° and wherein the image has substantially no distortion and requires substantially no keystone correction.    
   
   
       19 . The mobile media station of  claim 18 , wherein the wide-angle projection lens comprises the following components in sequential order from a screen side: 
 a first lens group of negative refractive power, the first lens group having at least one aspheric surface;    a second lens group of substantially zero refractive power and wherein an aperture stop lies within or near the second lens group; and    a third lens group of positive refractive power,    wherein the following Conditions (1) to (3) are satisfied:        |F   1 / F|< 4.0   Condition (1)    |F   2 / F|> 50   Condition (2)    |F   3 / F|< 3.5   Condition (3)    where    F is the focal length of the wide-angle projection lens;    F 1  is the focal length of the first lens group;    F 2  is the focal length of the second lens group; and    F 3  is the focal length of the third lens group.    
   
   
       20 . The mobile media station of  claim 17 , wherein the docking station comprises 
 a power supply to supply power to the projection module; and    a communications line to provide communication between the projection module and a computer.    
   
   
       21 . The mobile media station of  claim 20 , wherein the docking station further comprises a connection to provide at least one of a wired and a wireless network connection.  
   
   
       22 . The mobile media station of  claim 17 , wherein the projection module further comprises at least one of a handle and an expansion module.