Design Of Low Crosstalk Time-sharing Control Optical Fiber Directional Backlight System

Stereoscopic display technology is a new type of image display technology that allows viewers to obtain an unprecedented "high reality" visual experience without wearing 3D glasses.This subject research proposes a directional backlit free stereo display with side-emitting optical fiber,which projects the left and right parallax images played on the liquid crystal image display screen to the viewer's left and right eyes,respectively,to achieve free stereo display,the purpose is to provide a low manufacturing cost The side-emitting optical fiber directional backlight system with simple and reliable structure and no loss of image resolution and brightness can overcome the problem of resolution reduction of other types of naked-eye 3D displays,and can smoothly switch between 2D and 3D pictures during viewing Users adjust the playback needs of different video sources.Aiming at the problems of brightness uniformity and processing technology of the side-emitting plastic optical fiber backlight board,a processing method for equidistant V-groove scattering points of plastic optical fiber array was studied.A gravitation micro-cutting technique was proposed,and the relationship between the light scattering rate at the scattering point and the mass of the weight providing gravity was theoretically analyzed.By establishing a uniform light emission model of equidistant scattering points,the formula for calculating the mass of the weight required for processing each scattering point is theoretically deduced,and the relationship between the light scattering rate of the V-groove scattering points and the mass of the weight is verified,and their Relationship lines.Using the parameters obtained from the weight mass calculation formula,a large-size equidistant scattering point plastic optical fiber array backlight board with a brightness uniformity of 90.9% was produced.The feasibility of preparing the equidistant V-groove scattering points of plastic optical fiber array by gravity micro-cutting technique was proved.For the timing study of the drive control of the side-emitting fiber array backlight,a time-sharing drive control system was designed,and the working principle and unique advantages of the backlight control system were analyzed.The time-sharing drive circuit design for the side-emitting fiber array backlight is completed,including hardware circuit construction and software control algorithms.The hardware circuit part is composed of the main control chip and the backlight drive module circuit.The time-sharing control of the system requires the combination of each module and the drawing of its schematic diagram,and then the software program controls each part of the system.After that,all the modules were properly constructed,the production of the time-sharing drive circuit was completed,and the debugging and detection of its output signal were completed.Test and analyze the system after completing the system construction of the side-emitting fiber array time-sharing drive control.The crosstalk problem of the system was found by collecting the left and right parallax images displayed by the system,and the analysis showed that the light source signal of the side-emitting optical fiber backlight source was not field-synchronized with the display screen,and there was a delay between the refresh response of the liquid crystal display screen and the light source lighting.In order to eliminate crosstalk of left and right parallax images on the LCD screen,the experiment optimizes the parameters of the time-sharing drive circuit by two methods.By changing the phase of the light source signal corresponding to the side-emitting fiber and the output duty cycle(PWM)of the light source signal,the delayed crosstalk between the left and right parallax images is eliminated.It can be seen from the final optimization diagram that the crosstalk between the left and right parallax images is basically eliminated,so the research of the project is of great significance for the development of side-emitting fiber-oriented backlight free stereoscopic display devices with low crosstalk.