| As a new type of electrically adjusted control-light lens,the liquid-crystal microlens arrays(LCMLAs)demonstrate a tunable focusing character without any mechanical motion,which is different from traditional lenses,and thus arouse a wide attention.So far,the driving-controlling operation of LCMLAs are still mainly focused on the integrated electrical adjustment,while the research on the zoned or even addressable controlling of a large area LCMLA is still rare.In general,a large area LCMLA with an independently addressable control function can not only achieve a more precise spatial beam transformation,but also demonstrate a stronger capability of acquiring full-element image information of targets.As known,the current electrical driving-controlling means of LCMLAs can only perform the point-to-point control and thus the number of the driving-controlling signal output independently is till very limited.So,it is difficult to satisfy the demands in the number of the independent signal for large area LCMLAs based on addressable driving-controlling of a single microlens.Although the purpose of simultaneous outputting a large number of control signal outputs can be achieved by expanding the scale of the current driving-controlling system,there exists several problems such as being relatively bulky,complex adjusting operation,and being difficult to miniaturizing the driving-controlling system because too many wires should be connected between the driving-controlling system and the LCMLAs.In this thesis,an addressable electrical scanning driving-controlling(ESDC)scheme for large area LCMLAs based on the careful study of the key factors of LCMLAs including structural characters,optical characteristics and driving-controlling behaviors,is proposed.The main work of this thesis is as follows:Firstly,an ESDC approach of LCMLAs is proposed for performing addressable driving-controlling operation of a 16×16 LCMLA to implement wavefront detection and correction.Through control the multiple analog switches,the processes of simultaneous conducting output channel shifting and sending the output voltage signal of each DAC into each storage capacitor is achieved for regulating and holding the signal voltage applied over every LC microlens,so as to drive and further adjust large area LCMLA in an addressable ESDC mode.Based on the theoretical analysis and quantification discussion of the main parameters of the ESDC scheme,an overall architecture and parameter system of the addressable ESDC for LCMLAs are established,and also their feasibility is verified through carrying out the simulations and testaments and evaluation.Secondly,based on the proposed ESDC scheme,the main works including key hardware circuit design and fabrication,control algorithm design,flexible circuit design,and the chassis design of the ESDC system for large area LCMLAs,are achieved.Through designing the standard electric pin arrangement of the patterned electrode in a large area LCMLA and the flexible interface of the ESDC system,a highly efficient coupling between the LCMLAs and the ESDC system is achieved.Finally,the simulation and analysis of the electrical response characteristics of the LCMLAs based on the ESDC is completed.The simulation results show that the LC microlenses can perform independent focusing corresponding to any unit lens,and then zoned or collaborative focusing of multi microlens,and thus full array focusing based on the ESDC technology.The ESDC system designed in this thesis has demonstrated several typical features such as multi-mode hardware switching,multi-function algorithm control,multi-size and multi-channel flexible interface output features,so as to satisfy the addressably electrical driving-controlling requirements of LCMLAs according to arbitrary channel quantity from 1 to 256.To the future development of large area LCMLAs,the scale of output channels of the ESDC system can be further expanded through expanding and upgrading software and hardware. |
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