Optical lens type light guide device for led screen

Abstract

The invention relates to an optical lens type light guiding device of an LED screen. The optical lens type light guiding device is characterized in that the light guiding device is provided with a plurality of prism lens structures and a plurality of concave lens structures, the number of the prism lens structures being consistent with the number of LED lamps on the LED screen, the number of the concave lens structures being consistent with the number of LED lamps; the concave lens structures are used for covering the LED lamps on the LED screen; and the prism lens structures and the concave lens structures are located at two opposite sides of the light guiding device respectively. According to the optical lens type light guiding device of the LED screen, the concave lens structures are utilized to disperse the light of the LED lamps; the prism lens structures are utilized to perform refraction imaging on the dispersed light, so that a plurality of LED lamp image bright regions can be formed at two sides of the LED lamps, and therefore, the light spread of the LED lamps is more uniform, and non-luminous dark areas formed between pixels can be eliminated; since the plurality of LED lamp image bright regions are formed, the spatial frequency of original LED lamps can be changed, and the difference of the spatial frequency of LED lamp images and the spatial frequency of a CCD can be increased, and therefore, a moire phenomenon can be eliminated. The optical lens type light guiding device of the LED screen of the invention has the advantages of simple structure, easiness in processing, easiness in mass production and high practicability.

Description

【Technical field】 [0001] The invention relates to an optical device, in particular to an optical lens type light guide device for an LED screen that eliminates the phenomenon of moiré on the screen of the LED screen and the phenomenon of grid black lines in the non-luminous area. 【Background technique】 [0002] The LED lights and LED light gaps on the surface of the LED screen are usually arranged in an array, which has a certain periodicity. On an ordinary LED screen, since the light-emitting area of ​​the LED light is smaller than the physical surface area occupied by the pixels, there are obvious non-luminous black areas between the pixels, forming a grid-like periodic structure. Most of the image pickup devices of current photographic equipment are area array CCDs, which also have a periodic structure, and the spatial frequency of the CCD is relatively close to the spatial frequency of the distribution of LED lights on the LED screen, so when the camera equipment shoots ...

AI Technical Summary

Problems solved by technology

Although the existing technology can solve this problem to a certain extent, it reduces the amount of light emitted from the front and greatly reduces the brightness of the screen. It is realized by sacrificing the screen image, which is not the best solution.

Images