Image information displaying system and hologram display apparatus

Abstract

An image information displaying system comprises a transparent support, a hologram screen attached to the transparent support, a radiation unit for radiating image information on the hologram screen, a sensor for detecting the ambient condition within the viewing angle of the hologram screen, and a controller for controlling the radiation unit based on the signal from the sensor. The image information displaying system, which is inexpensive, long in service life, superior in eye-catching effect and low in running cost, consumes less energy and is controlled by a central control unit connected thereto through a communication line. The lower end of the hologram screen is 80 to 180 cm from the floor level.

What is claimed is:  
     
         1 . An image information displaying system comprising: 
 a transparent support;    a hologram screen attached to the transparent support;    a projector for projecting image information onto the hologram screen;    a sensor for sensing ambient conditions in a viewing angle of the hologram screen; and    a controller for controlling the projector according to signals from the sensor.    
     
     
         2 . The system of  claim 1 , wherein the viewing angle corresponds to an area whose brightness is K0/2 or over, where K0 is a brightness value at a front center point of the hologram screen).  
     
     
         3 . The system of any one of claims  1  and  2 , wherein the sensor is an illuminance sensor.  
     
     
         4 . The system of  claim 1 , further comprising: 
 a speaker for providing audio information, wherein the sensor is a volume sensor.    
     
     
         5 . The system of  claim 1 , wherein the sensor is designed to sense people who enter the viewing angle.  
     
     
         6 . The system of  claim 1 , wherein the system is installed in a mobile body.  
     
     
         7 . The system of  claim 6 , wherein the system is installed between two seats arranged in the mobile body.  
     
     
         8 . The system of any one of claims  6  and  7 , wherein the hologram screen is retractable when not used.  
     
     
         9 . The system of any one of claims  6  and  7 , wherein the sensor is a vibration sensor, and the controller corrects, according to signals from the vibration sensor, a blur of image information due to the vibration of the mobile body.  
     
     
         10 . The system of any one of claims  6  and  7 , wherein the sensor is a vibration sensor, and the controller suppresses, according to signals from the vibration sensor, the vibration of the projector due to the vibration of the mobile body.  
     
     
         11 . The system of  claim 1 , wherein the system is controlled by a central control unit that is connected to the system through a communication circuit.  
     
     
         12 . The system of  claim 11 , wherein the central control unit receives signals from the sensor through the communication circuit, and according to the signals, controls the projector.  
     
     
         13 . The system of  claim 1 , wherein the hologram screen has a diffuser recorded thereon.  
     
     
         14 . An image information displaying system comprising a transparent support, a hologram screen attached to said transparent support and a radiation unit for radiating image information on said hologram screen; 
 said image information displaying system being so configured as to be controlled by a central control unit connected through a communication line.    
     
     
         15 . An image information displaying system according to  claim 14 , comprising selected one of first and second configurations; 
 said first configuration being that said central control unit performs the process of correcting said image information;    said second configuration being that a relay is interposed between said central control unit and said image information displaying system, and a selected one of said central control unit and said relay performs the process of correcting said image information.    
     
     
         16 . An image information displaying system according to  claim 15 , wherein said process of correcting said image information is correcting a trapezoidal distortion.  
     
     
         17 . An image information displaying system according to  claim 15 , wherein said process of correcting said image information is at least a selected one of color adjustment, color correction, image position adjustment, image brightness adjustment and image contrast adjustment.  
     
     
         18 . An image information displaying system according to  claim 14 , further comprising means for supplying audio information, wherein a selected one of said central control unit and said relay is capable of correcting said audio information.  
     
     
         19 . An image information displaying system according to  claim 14 , further comprising a sensor for detecting the ambient condition in the viewing angle of said hologram screen and a radiation control unit for controlling said radiation unit based on the signal from said sensor.  
     
     
         20 . An image information displaying system according to  claim 19 , wherein said viewing angle is in a range not less than K0/4, where K0 is the brightness value at the center front of the hologram screen.  
     
     
         21 . An image information displaying system according to  claim 19 , wherein said sensor is an illuminance sensor.  
     
     
         22 . An image information displaying system according to  claim 19 , wherein said sensor is a sound volume sensor.  
     
     
         23 . An image information displaying system according to  claim 19 , wherein said sensor detects the entry of a viewer into said viewing angle.  
     
     
         24 . An image information displaying system according to  claim 19 , installed on a mobile body.  
     
     
         25 . An image information displaying system according to  claim 24 , installed between at least two seats in a mobile body.  
     
     
         26 . An image information displaying system according to  claim 24 , wherein said hologram screen is retractable when not in use.  
     
     
         27 . An image information displaying system according to  claim 24 , wherein said sensor is a vibration sensor, and said radiation control unit corrects the blur of said image information caused by the vibration of said mobile body, based on the signal from said vibration sensor.  
     
     
         28 . An image information displaying system according to  claim 24 , wherein said sensor is a vibration sensor, and said radiation control unit suppresses the blur of said radiation unit caused by the vibration of said mobile body, based on the signal from said vibration sensor.  
     
     
         29 . An image information displaying system according to  claim 19 , wherein selected one of said central control unit and said relay receives a signal from said sensor, through said communication line, and controls said radiation control unit based on said signal.  
     
     
         30 . An image information displaying system according to  claim 14 , wherein a diffuser is recorded in said hologram screen.  
     
     
         31 . A hologram displaying system comprising a hologram screen and a projector for projecting an image beam on said hologram screen, 
 wherein the lower end of said hologram screen is at the distance of 80 to 180 cm from the floor surface.    
     
     
         32 . A hologram displaying system according to  claim 31 , further comprising a mechanism for correcting a trapezoidal distortion.  
     
     
         33 . A hologram displaying system according to  claim 31 , wherein the diagonal length of said hologram screen is not less than 30 inches and the projection distance of the image beam is not less than 90 cm.  
     
     
         34 . A hologram displaying system according to  claim 31 , wherein the diagonal length of said hologram screen and said projection distance have a relation defined as y=ax+b, where x is the diagonal length in inches, y is the projection distance in cm and a and b are coefficients determined by the projector.  
     
     
         35 . A hologram displaying system according to  claim 31 , wherein said hologram screen is installed in an environment where the contrast is not less than 1.5, said contrast being defined as (image white screen brightness+background brightness+external light brightness)/(image black screen brightness+background brightness+external light brightness).  
     
     
         36 . A hologram displaying system according to  claim 31 , wherein said hologram screen has a selected one of first and second configurations; 
 said first configuration being that at least a corner of said hologram screen is chamfered;    said second configuration being that said hologram screen has a tapered section.    
     
     
         37 . A hologram displaying system according to  claim 31 , wherein adhesive is previously formed on the surface of said hologram screen, said hologram screen being adhered to glass by spraying water on the surface of the hologram screen before it is applied to the glass.  
     
     
         38 . A hologram displaying system according to  claim 31 , wherein said projector is is fixed at an inclination angle of 20 to 50 degrees to the horizontal ceiling surface by a fixing jig.  
     
     
         39 . A hologram displaying system comprising a hologram screen and a projector for projecting an image beam on said hologram screen, 
 wherein the center height of said hologram screen is 110 to 210 cm from the floor surface.    
     
     
         40 . A hologram displaying system according to  claim 39 , further comprising a mechanism for correcting a trapezoidal distortion.  
     
     
         41 . A hologram displaying system according to  claim 39 , wherein the diagonal length of said hologram screen is not less than 30 inches and the projection distance of the image beam is not less than 90 cm.  
     
     
         42 . A hologram displaying system according to  claim 39 , wherein the diagonal length of said hologram screen and said projection distance have a relation defined as y=ax+b, where x is the diagonal length in inches, y is the projection distance in cm and a and b are coefficients determined by the projector.  
     
     
         43 . A hologram displaying system according to  claim 39 , wherein said hologram screen is installed in an environment where the contrast is not less than 1.5, said contrast being defined as (image white screen brightness+background brightness+external light brightness)/(image black screen brightness+background brightness+external light brightness).  
     
     
         44 . A hologram displaying system according to  claim 39 , wherein said hologram screen has selected one of first and second configurations; 
 said first configuration being that at least a corner of said hologram screen is chamfered;    said second configuration being that said hologram screen has a tapered section.    
     
     
         45 . A hologram displaying system according to  claim 39 , wherein adhesive is previously formed on the surface of said hologram screen, said hologram screen being adhered to glass by spraying water on the surface of the hologram screen before it is applied to the glass.  
     
     
         46 . A hologram displaying system according to  claim 39 , wherein said projector is fixed at an inclination angle of 20 to 50 degrees to the horizontal ceiling surface by a fixing jig.  
     
     
         47 . A hologram displaying system comprising a hologram screen and a projector for projecting an image beam on said hologram screen, 
 wherein the projection angle of said projector to said hologram screen is 20 to 50 degrees.    
     
     
         48 . A hologram displaying system according to  claim 47 , further comprising a mechanism for correcting a trapezoidal distortion.  
     
     
         49 . A hologram displaying system according to  claim 47 , wherein the diagonal length of said hologram screen is not less than 30 inches and the projection distance of the image beam is not less than 90 cm.  
     
     
         50 . A hologram displaying system according to  claim 47 , wherein the diagonal length of said hologram screen and said projection distance have a relation defined as y=ax+b, where x is the diagonal length in inches, y is the projection distance in cm and a and b are coefficients determined by the projector.  
     
     
         51 . A hologram displaying system according to  claim 47 , wherein said hologram screen is installed in an environment where the contrast is not less than 1.5, said contrast being defined as (image white screen brightness+background brightness+external light brightness)/(image black screen brightness+background brightness+external light brightness).  
     
     
         52 . A hologram displaying system according to  claim 47 , wherein said hologram screen has a selected one of first and second configurations; 
 said first configuration being that at least a corner of said hologram screen is chamfered;    said second configuration being that said hologram screen has a tapered section.    
     
     
         53 . A hologram displaying system according to  claim 47 , wherein adhesive is previously formed on the surface of said hologram screen, said hologram screen being adhered to glass by spraying water on the surface of the hologram screen before it is applied to the glass.  
     
     
         54 . A hologram displaying system according to  claim 47 , wherein said projector is fixed at an inclination angle of 20 to 50 degrees to the horizontal ceiling surface by a fixing jig.