Dark state light recycling film and display
A liquid crystal display, film technology, applied in static indicators, instruments, optics, etc., to achieve the effect of improving brightness and efficiency
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no. 1 example
[0058] Referring to Figures 3A and 3B, there is shown one embodiment of the present invention for a bright state and dark state LCD display 20, respectively, in which reflective polarizer 52a is disposed between LC assembly 54a / 54b and front polarizer 50a. Here, the transmission axis of the front polarizer 50a and the transmission axis of the rear polarizer 50b are orthogonal to each other within ±10 degrees. According to the protocol described with reference to FIGS. 1A-1D and FIGS. 2A-2D , the LC off state converts P-polarization to S-polarization, and S-polarization to P-polarization. The pass axis of reflective polarizer 52a is parallel to the pass axis of front polarizer 50a. The recycled light from reflective polarizer 52a has a perpendicular polarization relative to front polarizer 50a.
[0059] Figure 3A shows how the LC display 20 handles light in the bright state. Unpolarized light from backlight unit 56 is incident on rear polarizer 50b, which transmits light with...
no. 2 example
[0064] In the embodiment of FIG. 3G and FIG. 3H of the present invention, the transmission axis of the front polarizer 50a and the transmission axis of the rear polarizer 50b are parallel to each other within ±10 degrees. This arrangement is also possible when the on-state and off-state characteristics of the LC components 54c / 54d are opposite to those of the previous examples of FIGS. 1A-3F. Here, the off-state LC component 54c does not change the polarization of the incident light; the on-state LC component 54d rotates the polarization of the incident light. Using this alternative arrangement, the pass axis of reflective polarizer 52a must match that of front polarizer 50a and back polarizer 50b to recycle dark state light as shown in Figure 3H. As with the first embodiment of Figures 3A-3D, the embodiments of Figures 3G and 3H do not suffer from additional contrast degradation due to ambient light.
no. 3 example
[0066] 4A-4D illustrate an LCD display 30 in an alternative embodiment. Here, a pair of reflective polarizers 52a and 52b are used to increase brightness and efficiency. The processing of bright and dark state light combines the functionality of the traditional use of reflective polarizers shown in Figures 2A-2D with the embodiments of the present invention shown in Figures 3A-3D. Unpolarized light from backlight unit 56 is incident on rear reflective polarizer 52a, which transmits one polarization (S-polarization in Figures 4A-4D) and reflects the perpendicular polarization back to backlight unit 56 for recycling. Rear polarizer 50b transmits light with S-polarization, absorbing any remaining P-polarization components. The off-state LC component 54a rotates the polarization of the light to provide output light with P-polarization. This light is then transmitted through reflective polarizer 52a and front polarizer 50a.
[0067]Figure 4B shows how the LC display 20 handles l...
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Abstract
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