Polarization rotating device and projection device
A technology of a rotating device and a projection device, which is applied in projection devices, optics, instruments, etc., can solve the problems of uneven color, uneven brightness and darkness, and scattered and uneven laser polarization direction and intensity, so as to achieve uniform color or brightness and darkness Effect
Active Publication Date: 2022-03-08
CORETRONIC
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Problems solved by technology
[0004] However, in the known lighting system architecture, the polarization polarity of the exciting light beam entering the projection device will be destroyed by the optical elements inside the projection device, so that the polarization direction and intensity of the laser light become scattered and inconsistent, resulting in the display screen light The problem of uneven brightness
Therefore, if the projection device produces a three-dimensional image display screen in the polarized stereo mode (lens plus polarizer), the image screen projected from the lens and polarizer will have uneven color or uneven brightness and darkness.
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[0058] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only referring to the directions of the drawings. Accordingly, the directional terms are used to illustrate and not to limit the invention.
[0059] figure 1 It is a schematic diagram of a projection device according to an embodiment of the present invention. Please refer to figure 1 . In this embodiment, the projection device 10 is used to provide a projection light beam LP. Specifically, the projection device 10 includes an illumination system 100 , at least one light valve 50 and a projection lens 60 , and the illumination system 100 is used to provide an illumination beam LB. The light valve 50 is disposed on the trans...
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The invention provides a polarization rotating device, which includes a rotating shaft, a driving element and a polarizing element. The driving element is used to drive the rotating shaft to rotate. The polarizing element is connected to the rotating shaft and arranged on the transmission path of at least one light beam, wherein the driving element is used to drive the polarizing element to rotate sequentially with the rotating shaft as the central axis of rotation. And when the polarizing element rotates, at least one light beam passes through the polarizing element, and the at least one light beam passing through the polarizing element has different polarization states at different times. Therefore, when the projection device is in the polarized stereoscopic mode, the color or brightness of the display screen can be made uniform, allowing the user to observe a stereoscopic display screen with better uniformity.
Description
technical field [0001] The present invention relates to a rotating device and an optical device, and in particular to a polarization rotating device and a projection device. Background technique [0002] The projection device is a display device for producing large-scale images, and has been continuously improving with the evolution and innovation of technology. The imaging principle of the projection device is to convert the illumination beam generated by the lighting system into an image beam through a light valve, and then project the image beam to a projection target (such as a screen or a wall) through a projection lens to form a projection image. [0003] In addition, the lighting system has also changed from ultra-high-performance lamps (UHP lamps) to light-emitting diodes (Light- emitting diode (LED), has evolved to the most advanced laser diode (laser diode, LD) light source. However, in the lighting system, the more cost-effective way to generate red and green li...
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IPC IPC(8): G03B21/20
CPCG03B21/2073G03B21/208
Inventor 林姚顺谢启堂蔡志贤潘浩炜
Owner CORETRONIC