| With the development of naked-eye 3D display technology,naked-eye 3D display has become the mainstream of technology research and development.Naked-eye 3D can describe the real world more realistically and better depict real and synthetic scenes.The directional time-division backlight display technology is based on the cylindrical lens,which uses the directional backlight to present three-dimensional picture.It is currently the ideal naked-eye 3D display technology.Due to complex light source structure,heavy display panel and expensive manufacturing cost,it is difficult to popularize in the traditional directional backlight display technology.In this paper,a new method is designed and manufactured by using POF array as a new type of directional backlight.POF array is designed and manufactured by analyzing POF array and cylindrical lens directional imaging optical path,precision control and error detection of the directional backlight of side-emitting POF array are analyzed.Firstly,technical principles of parallax barriers and cylindrical lens are introduced.These two technical schemes have some problems such as low brightness,high crosstalk,and loss of resolution.The traditional directional backlight display technology is introduced,which uses LCD(liquid crystal display)panel column as uniform backlight,and transmitted light passes through the cylindrical lens for directional backlight.This technology has the problems of few viewpoints and complex backlight structure and so on.In the end,the technical scheme of directional backlight using side-glowing POF is proposed.The traditional scheme of directional backlight is improved by using side-glowing POF array to replace original linear light source of LCD light.Requirement of process accuracy of backlight on display screen is reduced and backlight module is simplified.Secondly,the imaging principle of lenticular lens grating unit used in naked-eye3 D display is analyzed.The grating parameters of lenticular lens affect the optical properties and affect display effect.Based on the imaging formula of single refraction sphere,the model of the double spherical lens is established,and the optical parameter relationship of the lens unit is deduced.By analyzing directional imaging optical path consisting of side-glowing POF array and cylindrical lens array,the arrangement formula of side-glowing POF array is obtained.A three-viewpoint system is designed by using side-glowing POF array and cylindrical lens array.Solid Works software is used for modeling,and Trace Pro software is imported for simulation to obtain illuminance distribution curve of directional light source with side-glowing POF array.The results show that in the transverse regions of-500 ~ 500 mm,there are five peaks in a single viewpoint,and the distance between peaks of adjacent viewpoints is 65 mm,which is equal to distance from human eye and consistent with the theoretical results.And deviation of POF array is estimated.Assuming that optical fiber at a single viewpoint is shifted,main maximum illumination curve is obtained.From the results,it can be seen that decrease of peak value and increase of curve width lead to change of view area,increase of image crosstalk and decrease of 3D image display effect.Finally,a design and fabrication method for a kind of side-glowing POF array backlight is researched.A new type of POF array winding device is proposed,and precision control and error detection are analyzed.Then,crosstalk calculation model of the directional backlight is established,and luminance curve and Crosstalk distribution curve of directional backlight are measured.The results show that at the optimal distance of 530 mm,the side-glowing POF array has obvious characteristics of pointing light source.the minimum crosstalk in the transverse regions of-200 ~ 200 mm is less than 1%.At last,the effects of cylindrical lens aberration,POF array optical fiber dislocation and increasement of viewing angle on crosstalk degree of POF array directional backlight are analyzed. |
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