Projection Display Device
First Claim
Patent Images
1. A display device comprising:
- an illumination system (5) for providing an illumination beam (10);
a modulation panel (18) for modulating the illumination beam with image information;
diffusing means (16), for diffusing a first portion of the illumination beam having a first polarization direction and transmitting a confined second portion of the illumination beam having a second polarization direction; and
polarizing means (17), functionally arranged between said diffusing means (16) and said modulation panel (18), for transmitting said first portion of the illumination beam to said modulation panel (18), and preventing said second portion of the illumination beam from reaching said modulation panel (18).
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Abstract
The image homogeneity as well as the light effectiveness of a display device is improved by the introduction of a polarization dependent diffuser and a reflective polarizer between the light source and the LCD panel in the display device system. The image quality is improved since the diffuser broadens light incident on the LCD panel. The light effectiveness is improved as the polarizer reflects non-diffused light, confined, such that it can be recycled by light guiding means, in the display device, for re-illumination of the image display panel.
18 Citations
12 Claims
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1. A display device comprising:
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an illumination system (5) for providing an illumination beam (10); a modulation panel (18) for modulating the illumination beam with image information; diffusing means (16), for diffusing a first portion of the illumination beam having a first polarization direction and transmitting a confined second portion of the illumination beam having a second polarization direction; and polarizing means (17), functionally arranged between said diffusing means (16) and said modulation panel (18), for transmitting said first portion of the illumination beam to said modulation panel (18), and preventing said second portion of the illumination beam from reaching said modulation panel (18). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. Use of a polarization dependent diffuser (16) in a image projection system for improving homogeneity of an illumination beam incident on a modulation panel (18), arranged for modulating an illumination beam with image information, wherein said diffuser (16) diffuses a first polarization direction of said illumination beam and transmits a second polarization direction of said illumination beam.
Specification