Polarizing beam splitters incorporating reflective and absorptive polarizers and image display systems thereof
A polarizing beam splitter and image display technology, which is applied in polarizing components, image communication, instruments, etc., can solve the problems of increasing the manufacturing complexity of image display systems, sensitivity to alignment, etc.
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Examples
example 1 and comparative example A and B
[0045] Image display systems of Example 1 and Comparative Examples A and B were prepared, each of which included a PBS disposed between an illumination source, a prepolarizer, an imager, and a display screen. The components of each system are in accordance with the figure 1 Arranged in the same manner as shown, the prepolarizer is placed between the illumination source and the PBS. The imager consists of a mirror and a 1 / 4 wave plate whose fast or slow axis is aligned with the polarization direction of s-polarized light, thereby simulating the dark state of the ferroelectric LCoS imager. The bright state of the imager is simulated by rotating the 1 / 4 wave plate to a 45° angle to the polarization direction of s-polarized light.
[0046] The PBS of example 1 and PBS 14 (as figure 1 shown and as described above) where the reflective polarizer is a multi-layered polyamide under the trade designation "VIKUITI" T-35 advanced polarizing films ("VIKUITI" T-35 advanced polarizing fil...
example 2 to 4 and comparative example C to E
[0056] The image display systems of Examples 2 to 4 were arranged in the same manner as the system of Example 1 discussed above, except that the polarizing films were oriented at 35°, 45°, and 60°, respectively, with respect to the central ray forming the cone of light forming the incident beam. ° angle of incidence (eg, in Example 2, the angle of incidence between the central ray of the light cone forming the beam and the normal to the reflective and absorbing polarizers is 35°). Similarly, Comparative Examples C through E were arranged in the same manner as the system of Comparative Example B (without the absorbing polarizer) discussed above, except that the orientation of the polarizing films was respectively relative to the central ray of the light cone forming the incident beam At 35°, 45° and 60° incident angles.
[0057] Figure 4 and 5 are graphs showing the measured contrast ratio versus polarizer incidence angle and light wavelength spectrum for the systems of Exam...
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Abstract
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