Image plane adjusting structure of back projection TV

Abstract

The invention relates to picture adjust structure for back projection TV, special to the incline, trapezoid, trapezoidal wave, pillow shape, bucket shape and other distortion phenomenon. Wherein, projecting light contained image signal to reflector to reflect light to screen for picture adjust; the reflector is fixed by other fixer on back cover; using other adjusting nut on outside of back cover to move the fixer forward and backward to adjust reflection angle of reflector for adjusting distortion. This invention reduces element quantity and workload, has well effect, and can fit to any image projection device with reflector.

Description

technical field [0001] The present invention relates to the screen adjustment structure of the rear projection TV, especially the image distortion phenomena such as inclination, trapezoid, trapezoidal wave, pincushion shape and barrel shape seen on the screen of the rear projection TV. By adjusting the reflector, the picture distortion Phenomenon to adjust the screen adjustment structure of the rear projection TV. Background technique [0002] Generally speaking, rear-projection TVs are divided into two categories according to their driving principles: CRT-cathode ray tube (picture tube) TVs and LCD-liquid crystal display TVs: CRT rear-projection TVs are composed of three separate (red, green, blue) color A cathode ray tube produces image signals, while an LCD rear projection TV relies on an optical engine (illumination system + color system + projection mirror) to generate image signals. [0003] figure 1 It is a schematic cross-sectional view showing the structure of the...

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Problems solved by technology

[0019] But, the adjusting device of the original optical engine 50 of such constitution must be provided with adjusting device between engine chassis 51 and base 53, therefore, not only its structure is complicated, also needs more parts, thus comes, and assembling workload The main reasons for the increase in operating efficiency and the increase in material costs are the main reasons for the increase in the manufacturing unit price.

[0020] In addition, in order to install the adjustment device of the optical engine 50 according to the prior art, a large assembly space is required, which can affect the product design and make its appearance also become bulky and heavy. The adjustment device and the engine chassis for supporting the adjustment device 51, the weight of the base 53 becomes very heavy, and thus, the overall weight of the LCD rear projection TV increases, and further, along with the increase in weight, it affects the casing 60 and the rear cover 10, causing the optical engine 50 Or the position of the reflector changes, which aggravates the problem of picture distortion

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