3 results about "LCD projector" patented technology

The application discloses a kind of LCD projector lens shift device, including LCD light valve, bottom shell, cover plate, projection lens, vertical displacement component, horizontal displacement component and operating component;The LCD light valve, bottom shell and cover plate are sequentially arranged according to the direction of light travel;The LCD light valve is located on the incident side of the bottom shell and is assembled into an integral whole with the bottom shell;The optical axis of the projection lens and the plane where the display window of the LCD light valve is located are orthogonal;The middle of the cover plate and the bottom shell is hollow structure and is used to pass through the projection lens.The application realizes the mechanical shift of the projection lens, and does not produce loss and influence on the definition of image as electronic trapezoidal correction method, and the application has low manufacturing cost, high cost performance, and is especially suitable for large quantity and wide range, cost-sensitive projector products, and is suitable for single LCD, 2LCD and 3LCD projection technology.

Disclosed is a single LCD projector structure switchable between ultra-short distance projection and medium-long distance projection including a projection module. The projection module includes an LED light source, a condenser cup, a collimating Fresnel lens, an LCD light valve and a focusing Fresnel lens arranged in sequence. The single LCD projector structure further includes a first total reflection mirror and an objective lens module including an objective lens ring and a telescopic mechanism for stretching and retracting of the objective lens ring. A single LCD projector is also provided. The objective lens is shared by ultra-short distance projection and the medium-long distance projection without changing its optical characteristics, thus the objective lens group can move rapidly in a large range and fine focusing is performed in the far end ring or the near end ring, which improves the flexibility and practicability of projection and is suitable for various application scenes.

The present application provides a kind of phase difference sheet and liquid crystal projector, the phase difference sheet is equipped with substrate and as inclined film phase difference film, in the plane of the substrate and the film forming surface formed with the phase difference film parallel, the axis of the phase difference generated by the incident light for the incidence angle of +15 ° relative to the normal is +45 ° when the orientation of the slow axis when the substrate is rotated about the normal is azimuth of the substrate, the azimuth of the reference azimuth is 0 ° to 360 °, the phase difference generated by the incident light for the incidence angle of +15 ° relative to the normal is +45 ° when the orientation of the slow axis when the substrate is rotated about the normal is azimuth of the substrate, the absolute value of the difference between the first phase difference of the incident light when the azimuth is +45 ° relative to the reference azimuth and the second phase difference of the incident light when the azimuth is-45 ° relative to the reference azimuth is 6 nm or less.