Display apparatus

Abstract

A display apparatus includes: (i) a glasses-type frame that is mounted on the head of an observer; and (ii) an image display device that is attached to the frame, wherein the image display device includes (A) an image forming device, and (B) an optical device on which light emitted from the image forming device is incident, in which the light is guided, and from which the light is emitted, a light control device that adjusts an amount of external light incident from the outside is provided in a region of the optical device from which light is emitted, and the light control device includes two opposite transparent substrates, electrodes that are provided on the substrates, and an electrophoretic dispersion liquid that is sealed between the two substrates.

1 . A display apparatus comprising:
 (i) a glasses-type frame that is mounted on the head of an observer; and   (ii) an image display device that is attached to the frame,   wherein the image display device includes
 (A) an image forming device, and 
 (B) an optical device on which light emitted from the image forming device is incident, in which the light is guided, and from which the light is emitted, 
 a light control device that adjusts an amount of external light incident from the outside is provided in a region of the optical device from which light is emitted, and 
   the light control device includes
 two opposite transparent substrates, 
 electrodes that are provided on the substrates, and 
 an electrophoretic dispersion liquid that is sealed between the two substrates. 
   
     
     
         2 . The display apparatus according to  claim 1 , further comprising:
 an illuminance sensor that measures the illuminance of an environment in which the display apparatus is located,   wherein the transmittance of the light control device is controlled on the basis of the measurement result of the illuminance sensor.   
     
     
         3 . The display apparatus according to  claim 1 , further comprising:
 an illuminance sensor that measures the illuminance of an environment in which the display apparatus is located,   wherein the brightness of an image formed by the image forming device is controlled on the basis of the measurement result of the illuminance sensor.   
     
     
         4 . The display apparatus according to  claim 1 , further comprising:
 a second illuminance sensor that measures illuminance on the basis of light which passes through the light control device from an external environment,   wherein the transmittance of the light control device is controlled on the basis of the measurement result of the second illuminance sensor.   
     
     
         5 . The display apparatus according to  claim 1 , further comprising:
 a second illuminance sensor that measures illuminance on the basis of light which passes through the light control device from an external environment,   wherein the brightness of an image formed by the image forming device is controlled on the basis of the measurement result of the second illuminance sensor.   
     
     
         6 . The display apparatus according to  claim 4 ,
 wherein the second illuminance sensor is arranged closer to the observer than the optical device.   
     
     
         7 . A display apparatus comprising:
 (i) a glasses-type frame that is mounted on the head of an observer;   (ii) an image display device that is attached to the frame; and   an illuminance sensor that measures the illuminance of an environment in which the display apparatus is located,   wherein the image display device includes
 (A) an image forming device, and 
 (B) an optical device on which light emitted from the image forming device is incident, in which the light is guided, and from which the light is emitted, 
 a light control device that adjusts the amount of external light incident from the outside is provided in a region of the optical device from which light is emitted, and 
 the transmittance of the light control device is controlled on the basis of the measurement result of the illuminance sensor. 
   
     
     
         8 . A display apparatus comprising:
 (i) a glasses-type frame that is mounted on the head of an observer;   (ii) an image display device that is attached to the frame; and   an illuminance sensor that measures the illuminance of an environment in which the display apparatus is located,   wherein the image display device includes
 (A) an image forming device, and 
 (B) an optical device on which light emitted from the image forming device is incident, in which the light is guided, and from which the light is emitted, 
 a light control device that adjusts the amount of external light incident from the outside is provided in a region of the optical device from which light is emitted, and 
 the brightness of an image formed by the image forming device is controlled on the basis of the measurement result of the illuminance sensor. 
   
     
     
         9 . A display apparatus comprising:
 (i) a glasses-type frame that is mounted on the head of an observer;   (ii) an image display device that is attached to the frame; and   an illuminance sensor,   wherein the image display device includes
 (A) an image forming device, and 
 (B) an optical device on which light emitted from the image forming device is incident, in which the light is guided, and from which the light is emitted, 
 a light control device that adjusts the amount of external light incident from the outside is provided in a region of the optical device from which light is emitted, 
 the illuminance sensor measures illuminance on the basis of light which passes through the light control device from an external environment, and 
 the transmittance of the light control device is controlled on the basis of the measurement result of the illuminance sensor. 
   
     
     
         10 . A display apparatus comprising:
 (i) a glasses-type frame that is mounted on the head of an observer;   (ii) an image display device that is attached to the frame; and   an illuminance sensor,   wherein the image display device includes
 (A) an image forming device, and 
 (B) an optical device on which light emitted from the image forming device is incident, in which the light is guided, and from which the light is emitted, 
 a light control device that adjusts the amount of external light incident from the outside is provided in a region of the optical device from which light is emitted, the illuminance sensor measures illuminance on the basis of light which passes through the light control device from an external environment, and 
 the brightness of an image formed by the image forming device is controlled on the basis of the measurement result of the illuminance sensor. 
   
     
     
         11 . The display apparatus according to  claim 1 ,
 wherein the maximum transmittance of the light control device is equal to or greater than 50% and the minimum transmittance of the light control device is equal to or less than 30%.   
     
     
         12 . The display apparatus according to  claim 2 ,
 wherein, when the measurement result of the illuminance sensor is equal to or greater than a predetermined value, the transmittance of the light control device is equal to or less than a predetermined value.   
     
     
         13 . The display apparatus according to  claim 2 ,
 wherein, when the measurement result of the illuminance sensor is equal to or less than a predetermined value, the transmittance of the light control device is equal to or greater than a predetermined value.   
     
     
         14 . The display apparatus according to  claim 1 ,
 wherein the light control device imparts a desired color to light passing through the light control device.   
     
     
         15 . The display apparatus according to  claim 14 ,
 wherein the color imparted by the light control device is variable.   
     
     
         16 . The display apparatus according to  claim 14 ,
 wherein the color imparted by the light control device is fixed.   
     
     
         17 . The display apparatus according to  claim 1 ,
 wherein the light control device is removably provided in the region of the optical device from which light is emitted.   
     
     
         18 . The display apparatus according to  claim 1 ,
 wherein the optical device includes:   (a) a light guide plate in which incident light propagates while being totally reflected and from which the light is emitted;   (b) a first deflection unit that deflects light incident on the light guide plate so as to be totally reflected in the light guide plate; and   (c) a second deflection unit that deflects the light, which propagates in the light guide plate while being totally reflected, a plurality of times so as to be emitted from the light guide plate.   
     
     
         19 . The display apparatus according to  claim 18 ,
 wherein the second deflection unit is disposed in a projection image of the light control device.   
     
     
         20 . The display apparatus according to  claim 19 ,
 wherein the second deflection unit is covered with one of the two substrates forming the light control device.