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| One of the performance indices of a projector is the contrast ratio (the brightness ratio between white and black in an image). An application where a user wishes to enjoy a large-display television program, such as a Super Hi-Vision (SHV) program, in a darkened room like a home theater requires a method for reproducing black with a high contrast ratio. Although conventional projectors have contrast ratios in the range of several thousand to one, we are developing display devices that will have dramatically higher contrast ratios. |
- The display system projects the optical output from an ordinary RGB projector onto a panel for luminance, followed by luminous modulation. This attenuates the incident light in two stages to create the black areas in an image, reproducing a darker black.
- A contrast ratio of approximately 1 million to one is attained. Tone reproduction especially in dark areas has been improved.
- Since the human visual system has a lower color resolution in comparison to luminance, a high resolution image can be displayed by increasing just the resolution of the second modulator panel for luminance and keeping the RGB projector display device for the first modulator at low resolution.
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We will pursue research on signal processing methods to convert an ordinary video signal into an RGB modulated signal and a luminance modulated signal for this system. We will enhance the resolution of the panel for luminance with the goal of creating a projector for an SHV system.
This research is being conducted with Victor Company of Japan, Limited.
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High dynamic range projector configuration |
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