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Image-splitting techniques for a dual-layer high dynamic range LCD display

[+] Author Affiliations
Gabriele Guarnieri

University of Trieste, Dipartimento di Elettrotecnica, Elettronica e Informatica, Via Valerio 10, 34127 Trieste, Italy

Luigi Albani

FIMI-Philips, Via Saul Banfi 1, 21047 Saronno (VA), Italy

Giovanni Ramponi

University of Trieste, Dipartimento di Elettrotecnica, Elettronica e Informatica, Via Valerio 10, 34127 Trieste, Italy

J. Electron. Imaging. 17(4), 043009 (November 06, 2008). doi:10.1117/1.3010884
History: Received December 17, 2007; Revised July 24, 2008; Accepted August 31, 2008; Published November 06, 2008
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Liquid crystal displays (LCDs) are replacing analog film in radiology and reducing diagnosis times. Their typical dynamic range, however, can be too low for some applications, and their poor ability to reproduce low-luminance areas represents a critical drawback. The black level of an LCD can be drastically improved by stacking two liquid crystal panels in series. In this way the global transmittance is the pointwise product of the transmittances of the two panels and the theoretical dynamic range is squared. Such a high dynamic range (HDR) display also permits the reproduction of a larger number of gray levels, increasing the bit depth of the device. The two panels, however, are placed at a small distance from each other due to mechanical constraints, and this introduces a parallax error when the display is observed off-axis. A complex, spatially adaptive algorithm is therefore necessary to generate the images used to drive the two panels. We describe the characteristics of a prototype dual-layer HDR display and discuss the issues involved in the image-splitting algorithms. We propose some solutions and analyze their performance, giving a measure of the capabilities and limitations of the device.

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© 2008 SPIE and IS&T

Citation

Gabriele Guarnieri ; Luigi Albani and Giovanni Ramponi
"Image-splitting techniques for a dual-layer high dynamic range LCD display", J. Electron. Imaging. 17(4), 043009 (November 06, 2008). ; http://dx.doi.org/10.1117/1.3010884


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