Research On Intelligent Adjustment Technology For Flicker In Directional-Backlight Autostereoscopic Display

Autostereoscopic displays,allowing viewers to experience three-dimensional(3D)videos by sending left and right images to the left and right eyes without assistant equipment,have greater research value and application prospects compared to the assistant stereoscopic display technology.Nevertheless,the existing autostereoscopic display technology such as barrier gratings and lenticular array cannot provide satisfying viewing experience since they suffer from the problems of reduced resolution,large crosstalk and small viewing volume.On the contrary,directional backlight autostereoscopic display with spatial and sequential hybrid control developed independently by our group provides full panel resolution for left and right eyes,small crosstalk and large viewing volume by separating the light source(backlight)from the image source(liquid crystal display panel,LCD).Based on the in-depth discussion and analysis of the mechanism of the flicker phenomenon during the display process of this system,a naked-eye 3D assistant system with environmental adaptability is designed.Additionally,an evaluation method for flicker and a parameter self-adaptive system based on it are also proposed in this thesis.This thesis mainly discusses the following points:1.A naked-eye 3D assistant system with environmental adaptability is designed.The effect of ambient brightness on static flicker is explored by controlling the luminance of infrared LED in the dark room.The effect of specular reflection at glasses on static flicker is also explored by controlling the angle of the luminance of infrared LED at the same ambient brightness.Based on the above experimental conclusions,a naked-eye 3D assistant system with environmental adaptability is designed,which highly improves the adaptability of directional backlight autostereoscopic displays.2.An evaluation method for flicker is proposed.A high-speed camera is applied to simulated the human visual system.With the help of a stepper motor,the human-eye felt brightness fluctuation of the screen of directional backlight autostereoscopic displays can be recorded by the high-speed camera.3.A method for flicker reduction is proposed.First and foremost,based on the in-depth analysis of the flicker of directional backlight autostereoscopic displays,the human eye pupil motion prediction algorithm is proposed to compensate for the hardware latency on the level of software.This algorithm is effective to achieve the synchronization between the backlight and the pupil position of the human eye,giving rise to the reduction of flicker.Secondly,an automation feedback system for flicker evaluation is designed.Self-adaptive optimization of the system is accomplished by adjusting the parameters of the displays automatically based on the value of the flicker index.Finally,a standard optimization strategy for flicker is proposed.This strategy reveals that the reduction of flicker should be based on two general directions,which is expected to inspire the subsequent optimization.