Transmissive display apparatus and light control shade for transmissive display apparatus

Abstract

A transmissive display apparatus allows see-through observation in which video light and outside light are superimposed on each other for visual recognition of the superimposed light and further allows a light control shade to control the outside light by changing the outside light transmittance of the light control shade in accordance with a change in quantity of the outside light. In this case, in particular, when a decrease in the outside light quantity is detected with an outside light sensor, which is the outside light detection section, a light quantity control section of a primary control section performs quick response control in which the transmittance of the light control shade is quickly adjusted (outside light quantity is controlled).

What is claimed is: 
     
         1 . A transmissive display apparatus that superimposes video light and outside light on each other and allows visual recognition of the superimposed light, the apparatus comprising:
 a display section that displays the video light;   a light control shade that is so provided as to face the display section and controls the outside light;   an outside light detection section that detects the outside light; and   a light quantity control section that controls transmittance of the light control shade based on a result of the detection performed by the outside light detection section,   wherein the light quantity control section performs quick response control in which response speed of light quantity control in a case where the outside light detection section detects a decrease in quantity of the outside light is made faster than the response speed of the light quantity control in a case where the outside light detection section detects an increase in quantity of the outside light.   
     
     
         2 . The transmissive display apparatus according to  claim 1 , wherein the light control shade changes outside light transmittance by using electrical drive. 
     
     
         3 . The transmissive display apparatus according to  claim 2 , wherein the light control shade is formed of an SPD, an electrochromic device, or a guest-host liquid crystal or polymer dispersed liquid crystal device. 
     
     
         4 . The transmissive display apparatus according to  claim 1 , wherein the light quantity control section performs the quick response control in such a way that a rising period from time when the transmittance of the light control shade is caused to start increasing to time when the increase is completed in the case where the outside light detection section detects a decrease in quantity of the outside light is made shorter than a falling period from time when the transmittance of the light control shade is caused to start decreasing to time when the decrease is completed in the case where the outside light detection section detects an increase in quantity of the outside light. 
     
     
         5 . A transmissive display apparatus that superimposes video light and outside light on each other and allows visual recognition of the superimposed light, the apparatus comprising:
 a display section that displays the video light;   an outside light detection section that detects the outside light; and   a light quantity control section that controls luminance of the display section based on a result of the detection performed by the outside light detection section,   wherein the light quantity control section performs quick response control in which response speed of light quantity control in a case where the outside light detection section detects a decrease in quantity of the outside light is made faster than the response speed of the light quantity control in a case where the outside light detection section detects an increase in quantity of the outside light.   
     
     
         6 . The transmissive display apparatus according to  claim 5 , wherein the light quantity control section performs the quick response control in such away that a period for which the luminance of the display section is decreased in the case where the outside light detection section detects a decrease in quantity of the outside light is made shorter than a period for which the luminance of the display section is increased in the case where the outside light detection section detects an increase in quantity of the outside light. 
     
     
         7 . The transmissive display apparatus according to  claim 1 , wherein the light quantity control section performs the quick response control in such a way that response speed in the light quantity control in a case where the outside light detection section detects a decrease in quantity of the outside light that exceeds a threshold in a predetermined period is made faster than the response speed in typical light quantity control based on moving average of changes in quantity of the outside light. 
     
     
         8 . The transmissive display apparatus according to  claim 5 , wherein the light quantity control section performs the quick response control in such a way that response speed in the light quantity control in a case where the outside light detection section detects a decrease in quantity of the outside light that exceeds a threshold in a predetermined period is made faster than the response speed in typical light quantity control based on moving average of changes in quantity of the outside light. 
     
     
         9 . The transmissive display apparatus according to  claim 7 , wherein the light quantity control section performs the typical light quantity control when the outside light detection section detects no change in the outside light quantity that exceeds the threshold in the predetermined period. 
     
     
         10 . The transmissive display apparatus according to  claim 7 , wherein the light quantity control section performs delay control in which response speed in the light quantity control in a case where the outside light detection section detects an increase in quantity of the outside light that exceeds the threshold in the predetermined period is made slower or equal to the response speed in the typical light quantity control. 
     
     
         11 . The transmissive display apparatus according to  claim 1 , wherein the outside light detection section has an ambient sensor that senses brightness of the outside light in a direction of a viewer's sight line. 
     
     
         12 . The transmissive display apparatus according to  claim 5 , wherein the outside light detection section has an ambient sensor that senses brightness of the outside light in a direction of a viewer's sight line. 
     
     
         13 . The transmissive display apparatus according to  claim 11 , wherein the outside light detection section has a plurality of ambient sensors and senses the brightness in an upward direction with respect to the viewer as well as in the direction of the viewer's sight line. 
     
     
         14 . The transmissive display apparatus according to  claim 11 ,
 wherein the outside light detection section has a camera that performs imaging over a detection range of the ambient sensor and/or a vicinity of the detection range to acquire image information, and   the light quantity control section determines an amount of control of light quantity based on the image information acquired in the imaging performed by the camera.   
     
     
         15 . The transmissive display apparatus according to  claim 1 , wherein the light quantity control section performs the light quantity control over an area wider than a range of a viewer's discrimination visual field. 
     
     
         16 . The transmissive display apparatus according to  claim 5 , wherein the light quantity control section performs the light quantity control over an area wider than a range of a viewer's discrimination visual field. 
     
     
         17 . The transmissive display apparatus according to  claim 1 , wherein the light quantity control section is capable of switching the light quantity control in accordance with an outside light priority mode in which priority is given to visual recognition of the outside light and a video light priority mode in which priority is given to visual recognition of the video light and performs the quick response control when the apparatus operates in the outside light priority mode. 
     
     
         18 . The transmissive display apparatus according to  claim 5 , wherein the light quantity control section is capable of switching the light quantity control in accordance with an outside light priority mode in which priority is given to visual recognition of the outside light and a video light priority mode in which priority is given to visual recognition of the video light and performs the quick response control when the apparatus operates in the outside light priority mode. 
     
     
         19 . A light control shade that is so provided as to be attachable and detachable to and from a transmissive display apparatus that includes a display section that displays video light and superimposes the video light and outside light on each other to allow visual recognition of the superimposed light, the light control shade so attached as to face the display section and controlling the outside light incident on the transmissive display apparatus,
 wherein the light control shade controls the outside light in such away that increase in outside light transmittance is faster than decrease in the transmittance.