针对特殊应用场合小视角液晶屏的背光模块研究

发布时间：2018-03-23 02:07

本文选题：背光模块　切入点：视角　出处：《安徽师范大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来很多液晶屏生产厂商盲目地追求广视角大屏显示,大屏显示虽然带给消费者不一样的视觉体验,但他们忽略了一些特定场合对液晶屏的特殊要求。例如飞机的驾驶舱或者航天器上的液晶面板,如果视角过大,液晶屏发射的光线被周围仪表面板向各个方向反射,会干扰飞行员的视线,特别是在夜晚驾驶时,液晶面板发出的光对飞行员视线造成的干扰是非常危险的。此外在一些如机场、银行等公开场合,用户信息都是不希望被泄露和偷窥的,用户只希望在自己的角度可以看到屏幕内容。在这些特殊情况下,就需要小视角液晶屏。可以通过3M公司的防窥膜达到减小液晶屏视角的效果,但其成本较高,其次会影响显示屏的亮度,而且达不到国军标的要求,所以亟须要研究特殊场合小视角液晶屏和相应的背光模块。本文提出了能减小出光角度的液晶屏背光模块的两种方法,一种是使用LED光源模块及导光板模块对角度控制;导光板模块对角度控制主要采用两块导光板,在导光板一外表面设三棱柱阵列,透镜阵列设于另一导光板的外表面,并在其内表面贴上增光片;LED光源模块包括:LED、扩散板、下扩散片等结构。另一种方法是运用菲涅尔透镜的光学原理来实现小视角液晶显示。通过软件模拟和实验相结合的方式验证了本文的方案可行,使得液晶屏出光角度控制在水平方向左右40度,垂直平面内上下45度内,设计的背光模块可以有效的减小液晶屏出光角度,可满足飞机驾驶舱及防窥显示器的要求。
[Abstract]:In recent years, many LCD manufacturers have blindly pursued wide-view, large-screen display, although it brings consumers a different visual experience. But they ignore the special requirements for LCD screens for certain occasions, such as the cockpit of an airplane or the LCD panel on a spacecraft, and if the view is too large, the light emitted by the LCD screen is reflected in all directions by the surrounding panel. It interferes with the pilot's sight, especially when driving at night, the light emitted by the LCD panel is very dangerous to the pilot's vision. In addition, in some public places such as airports, banks and so on, Users don't want to be leaked or peeped. They just want to see screen content from their own perspective. We need a small view LCD screen. We can reduce the viewing angle of LCD screen through 3M company's speculum film, but its cost is higher, then it will affect the brightness of the display screen, and it will not meet the requirements of the national army. Therefore, it is urgent to study the small angle LCD screen and the corresponding backlight module in special occasions. In this paper, two methods are proposed to reduce the angle of the LCD screen, one is to use the LED light source module and the other is the light guide board module to control the angle; The light guide plate module mainly adopts two light guide plates to control the angle. A triangular prism array is arranged on one outer surface of the light guide plate, and the lens array is arranged on the outer surface of another light guide plate. Another method is to use the optical principle of Fresnel lens to realize the small angle liquid crystal display. The feasibility of this scheme is verified by the combination of software simulation and experiment. The output angle of LCD screen is controlled about 40 degrees in horizontal direction and 45 degrees above and below vertical plane. The designed backlight module can effectively reduce the output angle of LCD screen and meet the requirements of aircraft cockpit and peep-proof display.
【学位授予单位】：安徽师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN873.93

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