projection screen
A projection screen and screen technology, applied in the field of screens, can solve the problems of limited contrast improvement effect and unfixed projection light direction, and achieve the effect of improving image contrast.
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no. 1 example
[0044] Such as Figure 5 As shown, for a projection device such as a laser projector, the projected light is narrow spectrum light. And for ambient light such as sunlight and lights, they are all broad-spectrum light. Therefore, according to the above-mentioned generalized etendue, the difference in the characteristic of wavelength between the two can be used for selective modulation, thereby improving the contrast of the projection device.
[0045] Figure 6 A schematic diagram of a projection screen according to a first embodiment of the present invention is shown. The light incident surface of the projection screen is provided with a wavelength selective filter layer such as Figure 6 The grating microstructure shown. Such as Figure 6 As shown, the grating microstructure has a three-layer structure, wherein the layer (hereinafter, also referred to as the first optical layer) located on the inner side of the screen (that is, away from the light incident side) includes ...
no. 2 example
[0050] Figure 8 A schematic cross-sectional view of a projection screen according to a second embodiment of the present invention is illustrated. Compared with the first embodiment, the light-incident side surface of the projection screen in this embodiment adopts the zigzag structure of the black grid precision display screen mentioned above, and the side of the zigzag structure facing the projected light Part of the surface is provided with the above-mentioned grating microstructure.
[0051] Specifically, the projection screen includes a screen substrate 201 and a light reflection part 202 . The light reflection part 202 includes a first surface 203 and a second surface 204 facing different directions, wherein the first surface 203 faces the incident direction of the projection light 209 . Preferably, as Figure 8 As shown, the light reflection part 202 has a triangular prism structure, the first surface 203 faces the projection light 209 incident from obliquely below, ...
no. 3 example
[0054] According to the definition of generalized etendue, in addition to the above-mentioned two dimensions of wavelength and angle, the projection screen can also use more technical means to distinguish and modulate the projection light and ambient light to further improve the contrast of the projection image.
[0055] For example, many existing projection devices use LCDs and LCOSs for light processing. A characteristic of this type of processing is that the incoming light is polarized and the outgoing light is also polarized. Usually, the linearly polarized light of the projector is converted into elliptically polarized light by setting a 1 / 4 wave plate in front of the lens of the projector. Ambient light is usually natural light. Accordingly, projection light and ambient light can be distinguished in the dimension of polarization. As another example, the luminous flux of existing projection devices is usually several hundred to several thousand lumens. Compared with th...
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