Patent ID: 9214111
Filing Date: 2015-12-15
Classification: G02F,G09G

Abstract:
1. An image display apparatus comprising: an image acquisition device acquiring an image for display; a transparent display panel that displays the image acquired by the image acquisition device; a backlight unit that is installed in a back of the transparent display panel and can perform brightness control of a backlight with respect to the transparent display panel for each of divided segments; a representative brightness value calculation device calculating a representative brightness value of multiple pixels corresponding to each segment of the backlight unit, with respect to the image acquired by the image acquisition device; an illumination detection device measuring illumination of light irradiated to a surface of the transparent display panel; a backlight brightness characteristic acquisition device acquiring a backlight brightness characteristic showing a relationship between a representative brightness value and backlight brightness set according to the representative brightness value, acquiring a second backlight brightness characteristic in which display brightness corresponding to an image data value of the image for display is close to be linear when the illumination detected by the illumination detection device is greater than a first threshold and equal to or less than a second threshold that is larger than the first threshold, acquiring a first backlight brightness characteristic in which backlight brightness of a low brightness part of the image for display is set lower than the second backlight brightness characteristic when the detected illumination is equal to or less than the first threshold, and acquiring a third backlight brightness characteristic in which backlight brightness of a medium brightness part of the image for display is set higher than the second backlight brightness characteristic when the detected illumination is greater than the second threshold; and a control device controlling brightness of each segment of the backlight unit based on the backlight brightness characteristic acquired by the backlight brightness characteristic acquisition device and a representative brightness value corresponding to each segment calculated by the representative brightness value calculation device.