Liquid crystal projector with ferroelectric liquid crystal controller

Abstract

The present invention is liquid crystal projector with ferroelectric liquid crystal modulator. When the ferroelectric liquid crystal modulator accepts the incident light beam along the incident light path, the light beam will be modulated by the ferroelectric liquid crystal modulator into image light beam and the image light beam is reflected along the reflecting light path. The incident light path and the reflecting light path constitute one non-zero angle to increase the contrast of the image.

Description

technical field [0001] The invention relates to a liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC), especially a liquid crystal projection device using a reflective ferroelectric liquid crystal modulator. Background technique [0002] Please refer to shown in Fig. 1, the liquid crystal display panel used in the existing liquid crystal projection device is a TN-type or STN-type liquid crystal display panel, but the theoretical rotation angle of the liquid crystal molecules 10a of the TN-type or STN-type liquid crystal display panel is 90 degrees (solid line), and the liquid crystal molecules 10a are used to rotate the incident light, which can be used as a light valve, but the theoretical rotation angle of the liquid crystal molecules 10a is often due to the variation factors of the liquid crystal display panel during manufacture or the operating temperature is too high The high or too low environment, and the reaction speed of the liquid ...

AI Technical Summary

Problems solved by technology

The biggest advantage of the ferroelectric liquid crystal modulator (FLC) over the TN type or STN type liquid crystal display panel is that the response time of the ferroelectric liquid crystal modulator (FLC) is shorter than that of the TN type or STN type liquid crystal display panel. It is about 10 to 100 times faster, so it can overcome the shortcomings of blurred images when watching animations. Therefore, the ferroelectric liquid crystal modulator (FLC) is suitable for liquid crystal projection devices. Please refer to Figure 2, the liquid crystal projection device It includes a light source 20a, an optical lens module 30a, a ferroelectric liquid crystal modulator (FLC) 40a, and a projection lens group 50a. The optical lens module 30a includes a light-transmitting color disk 31a, a front lens 32a, an integrating unit 33a, and a polarization conversion assembly 34a, rear lens group 35a and polarizing prism 36a, which are arranged in sequence, the light beam from the light source 20a penetrates the optical lens module 30a, and is projected to the ferroelectric liquid crystal modulator (FLC) 40a with the first optical path 60a , the ferroelectric liquid crystal modulator (FLC) 40a modulates the beam into an image beam and reflects it along the second optical path 70a, passes through the polarization conversion component 34a, and then projects to the projection lens group 50a, so that the projection The lens group 50a projects the image light beam, wherein the first optical path 60a and the second optical path 70a are parallel, and although the image projected by the liquid crystal projection device improves the blurred image phenomenon in the dynamic picture, the image The contrast ratio is worse than when using the TN type or STN type liquid crystal display panel

[0004] Therefore, the reason is that the rotation angle of the liquid crystal molecules of the ferroelectric liquid crystal modulator (FLC) is +22.5 degrees, and due to the influence of the non-ideal bookshelf structure, the rotation angle decreases (Please refer to Figure 3, the solid line is the theoretical position, and the rotation angle is θ 1 , the dotted line is the actual position, and the rotation angle is θ 2 , θ 2 1 ), so the contrast of the projected image is not good, so how to use the short response time of the ferroelectric liquid crystal modulator (FLC) to improve the contrast of the image and reduce the manufacturing cost of the projector has become an important issue

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