Patent ID: 9064445
Filing Date: 2015-06-23
Classification: G02B,G09G,H04N

Abstract:
1. A transmission type display device comprising: an image formation unit that forms an image of image light being output to an image extraction area; a display unit that transmits ambient light to an image extraction area, so as to output image light from the image formation unit to the image extraction area, and changes a light level of the ambient light with a transmittance that is set by a shade in which a transmittance of light is a variable so as to pass the light to the image extraction area; an ambient light sensor that detects a level of the ambient light; a transmission light sensor that detects a level of the transmitted light passing through the shade; and a control unit that determines a first mode in which a light intensity determination value that is a value for determining a light intensity of an image formed by the image formation unit is fixed, and a second mode in which the light intensity determination value is variably set, wherein in the first mode, the control unit fixes the light intensity determination value, and controls the transmittance of the shade based on a detection result by the ambient light sensor and the transmission light sensor, and wherein in the second mode, the control unit variably sets the light intensity determination value, and controls the transmittance of the shade and the light intensity determination value based on a detection result by the ambient light sensor and the transmission light sensor.