| During the long process of history,human beings have never stopped exploring and pursuing the display technology.From the black-and-white display technology to color display technology,from CRT display technology to liquid crystal display technology and OLED display technology,the need for a better display is constantly increasing.Nowadays,the three-dimensional information of objects need to be acquired to determine and analyze accurately in work,production,and research.However,the mainstream display methods currently are the two-dimensional display,which lacks the depth information of real-world objects and brings great inconvenience to people's work and production.Therefore,the glasses-free 3D display technology is considered as the main development direction of the next-generation display technology.In order to achieve this goal,scientists have proposed various schemes to reconstruct 3D images.However,these existing glasses-free 3D display systems still have many problems that need to be overcome and resolved,in terms of the definition,the viewing angle,the display depth and the crosstalk between viewpoints,etc.In order to achieve a high-quality 3D images and solve the above problems,the key technologies for improving the display performance of the glass-free 3D display system are studied in this paper.The research contents and innovational points of this paper are as follow:(1)The analysis and optimization design of optical system based on the front projection display systemKey point 1:For the front projection display system,due to the aberrations of the lenticular sheet,the crosstalk between viewpoints is serious and the 3D image is unclear.In this paper,based on the Seidel primary aberrations theory,a method is proposed to solve above problems:increase the radius of curvature of the lenticular sheet or reduce the aperture of that.Through the related simulations and experiments,we confirmed that the maximum crosstalk is reduced from 90%to less than 10%within the viewing range of 48°.Although the crosstalk between viewpoints can be improved by the above method,the viewing zone of the display system is reduced.In this paper,based on the aberration balancing algorithm,the aspherical meniscus lenticular sheet is proposed.The simulation and experimental data demonstrate that the maximum crosstalk is reduced from 90%to less than 10%within the viewing range of 48°without decreasing the viewing zone.(2)The analysis and optimization design of optical system based on the light-field display systemKey point 2:The 3D image with the non-uniformity and blurry is the problem of the conventional light-field display systems based on LCD and directional diffusion screens.In this paper,the light radiation theory is used to analyze the light energy utilization.The Fresnel-lens-array with eccentric pupils is proposed to improve the light energy utilization and the viewing angle is increased from 41.9° to 59.7°.In additional,the quality of 3D image can be improved based on the aspheric substrate and optical surface.(3)The analysis and optimization design of optical system based on the integrated imaging display systemKey point 3:The less viewpoint information and narrow viewing angle are problems of the traditional integrated imaging display system.Although these problems can be improved by increasing the size of the lens-unit,the gap and graininess of lens-unit can seriously affect the 3D images.At the same time,the aberrations is more serious especially the large outside-screen depth and viewing angle.In order to solve these problems,the floating display system based on the tessar-array and the holographic function screen is proposed.The high image quality and full parallax floating 3D image with the display size of 23.6 inches,the viewing angle of 45°,the display depth of more than 20cm and the viewpoint number of 7744 can be realized.(4)The analysis and optimization design of optical system based on the 360° glasses-free 3D display systemKey point 4:In order to realize a 360° glasses-free 3D display system based on the LCD with the high image quality.In this paper,the triple compound lens array and the holographic function screen are proposed.In the discussion,we firstly analyze the aberration characteristics of the display system and the relation between display effect and the aberration based on the single lens array.Secondly,according to the Ring-shaped viewing area,a novel compound lens-array is proposed,whose MTF values within the viewing zone are greater than 0.6.Finally,based on the proposed lens-array and the holographic function screen,a high image quality 3D display effect with the maximum unilateral radial viewing angle 30° and the viewpoint number of 7744 can be achieved. |
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