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] see figure 1 As shown, 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 (the solid line part ), 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 or too low environment, and the reaction speed of the liquid crystal ...

AI Technical Summary

Problems solved by technology

The biggest advantage of the ferroelectric liquid crystal display panel (FLC) over the TN type or STN type liquid crystal display panel is that the response time of the ferroelectric liquid crystal display panel (FLC) is faster than that of the TN type or STN type liquid crystal display panel. 10 to 100 times more, so it can overcome the shortcomings of blurred images when watching animations. Therefore, the ferroelectric liquid crystal display panel (FLC) is suitable for liquid crystal projection devices. Please refer to figure 2 As shown, the liquid crystal projection device includes a light source 20a, an optical lens module 30a, a ferroelectric liquid crystal display panel (FLC) 40a, and a projection lens group 50a. 33a, polarization conversion component 34a, rear lens group 35a and polarizing prism 36a, which are arranged in sequence, the light beam from the light source 20a passes through the optical lens module 30a, and is projected to the ferroelectric liquid crystal display with the first optical path 60a panel (FLC) 40a, the light beam is modulated into an image beam by the ferroelectric liquid crystal display panel (FLC) 40a, reflected along the second optical path 70a, passed through the polarization conversion component 34a, and then projected to the projection lens group 50a, In order to project the image light beam from the projection lens group 50a, wherein the first optical path 60a and the second optical path 70a are parallel, and the image projected by the liquid crystal projection device can improve the blurred image phenomenon in the dynamic picture , but the contrast of the image 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 display panel (FLC) is +22.5 degrees, and due to the influence of the non-ideal bookshelf structure, the rotation angle decreases (please refer to image 3 As shown, 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 utilize the short response time characteristics of the ferroelectric liquid crystal display (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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