Controllable Liquid Crystal Parallax Barrier And Its Applications In Stereoscopic Displays

Recently,with the rapid development of flat panel displays and projection displays,stereoscopic display technology has also made considerable progress,and is entering gradually into people's daily lives.The existing autostereoscopic displays based on parallax barrier have still a number of problems,including the compatibility of viewpoints,the contradiction between multi-view and high resolution,and so on.Based on the above-described problems,a controllable liquid crystal parallax barrier with double layers of electrodes was proposed to avoid the electrode intervals which were caused by fabrication.capacity.Stereoscopic display systems based on controllable number of viewpoints and full resolution were implemented by controlling the liquid crystal cell.Specific studies include:(1)The geometry model of stereoscopic display with controllable parallax barrier was established,the relations of the stereoscopic display system parameters were derived,the periodicity of the area of stereoscopic display had been studied and proven.The simulation system of three-dimensional display had been built using TracePro,stereoscopic display systems based on controllable number of viewpoints and full resolution were simulated by changing the ratio between dark area and transparent area.Simulation results show that:parallax barrier based on controllable liquid crystal cell can work in a variety of modes and the crosstalk of stereoscopic display was reasonable.(2)The drive electrodes with double staggered structure were fabricated using ITO-SiO2-AZO on glass substrate by photolithography and thin film process.The substrates with driving electrodes and common electrode were prepared respectively,and then were assembled to form controllable liquid crystal cell.Measurements using optical microscopy show that:on the substrate with driving electrodes,ITO electrodes and AZO electrodes were alternately arranged on the glass with Si02 dielectric layer between them for isolation,the width of both electrodes were 275.8nm.Electrical testing results show that:the liquid crystal cell was transparent when there was no applied voltage;when a pulse signal with frequency of 100Hz,and intensity of ±5 V was applied between the driving electrode and common electrode,the liquid crystal cell was opaque.Selectively driving the liquid crystal cell electrode can effectively control the opaque area and transparent area which was the foundation to realize controllable liquid crystal parallax barrier.(3)The drive circuit of liquid crystal cell was designed and studied,and it was used to drive liquid crystal cell in different models with different transmittance-shading ratios.The test results show that,the ratio of shading areas and transparent areas of the liquid crystal cell can be controlled to achieve 3D display with controllable number of viewpoints and full resolution.In summary,this thesis presents a controllable liquid crystal parallax barrier,a drive circuit was also developed to control and modulate the grating state to solve the compatibility problems between viewpoints compatible stereoscopic display and full-resolution stereoscopic display,which possesses considerable potential applications in the field of stereoscopic displays.