We developed the viewing angle controllable TFT-LCD which has the same thickness and weight as conventional TFT-LCD, because it is made of only one LC cell without additional other components. Furthermore, to control more effectively narrow viewing angle, we applied two new methods which are luminance compensation and background character insertion. The viewing angle of this display can be changed from 80° to 170°.
An image processing method is proposed to realize polarizer-free imaging of liquid crystal lens. Images I(l) and I(nl) are captured sequentially in the lens and non-lens states of the LC lens, respectively, and are used to generate a final high contrast image. The proposal is tested by experiments. Clear and well focused images are obtained, even though no polarizer is employed in the imaging system.
A method of improving the image quality of an optical system using liquid crystal lens is proposed and demonstrated by experiments. Because image magnification is invariant with liquid crystal lens imaging, an image processing using focused and defocused images can be done to enhance the contrast of the focused image.
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