Design and Implementation of a Novel Tunable LC Lens in Compact Camera Modeules of Mobile Phones(I)
CHAO CHANG-PO, PAUL
|關鍵字:||液晶透鏡;可變焦透鏡;自動對焦鏡頭;模組化液晶鏡頭;Liquid crystal lens;tunable focal length lens;auto focusing lens module;compact carema mudule (CCM)|
This proposal is to design a novel tunable lens module using the birefringence property of liquid crystals (LC). The tunability of the designed LC lens in the foucs length is made possible by adjusting applied filed to turn the LCs inside the len to desired postures, acting as an gradient index lens (GRIN). This LC lens is best suitable for replacing moving objective lens in the compact cameras modeule (CCM) for mobile phones to implement the functions of auto-focusing and zooming. It is advantageous to replace conventional lens with lightweight and compact in some applications, include micro-lens module, cell phone component, fixed focal length web camera, blu-ray disk, three-dimension (3D) display, and optical tweezer. One can design positive and negative LC lenses to be combined with CCDs with conventional lens components for the LC lens module in order to performiong auto-focusing and zooming. In recent years, the on-line tunability in the focal length of a common variable focus lens is achieved by the mechanical motion of the individual lenses in CCM. The control mechanism for lens motion is generally complicated, and the movements of the lenses usually need a large space. To remedy the problem, the LC tunable lens is rpoposed and used in the CCM herein to save space in mobile phones. In the first year ofproject execution, it is planned to establish the optical model of the LCs and predictthe resulted index change distribution and the focus length. The theoretical predictions are also validated by commercial software. With the LC lens well designed, the lC lenses are optimized to lead to best focusing capability with a measure defined. Finally, in this year, an inspection machine for measuring the capability of the designed LC lens. In the second year, based on the experience gained in the first year, new LC materials leading to low voltage drives and fast reposnse offered by sub-projects 5 and 6 are adopted for a better tunable LC lens. Also conducted in this year are combining the developed LC lens with the color compensation chip developed by sub-project 3 to achieve high color gamma. Int eh last year, the maturally-developed LC CMM is integrated with the image stabilizer developed by sub-project 1 to form the novel CCM for camera phones, as proposed by the net-proposal.
|Appears in Collections:||Research Plans|