High Dynamic Range (HDR) Imaging

We developed an effective approach for high dynamic range (HDR) imaging initially as a component of our overall lighting research program. The HDR display uses two or more electronic light modulator positioned in series, and controlled by a single computer, to substantially increase the dynamic brightness range of the resulting image. With this technology, it is possible to display an extended dynamic range of luminance values, so that a single image can simultaneously display very bright regions and very dark regions. In this device, an array of high brightness light emitting diodes (LEDs) are used to illuminate the LCD panel. The LEDs can be individually controlled to form a low resolution, high brightness image and this blurry monochrome image is used backlight the transmissive LCD panel. The combination of these two panels achieves the high dynamic range. As a result, the HDR display produces images that look far more realistic than those shown on a conventional television or computer monitor.