一种采用直下式背光技术的智能电视的硬件设计

发布时间：2018-04-16 08:18

本文选题：液晶电视 + 直下式背光　；参考：《东南大学》2017年硕士论文

【摘要】：液晶电视产业目前已经基本完成了从CCFL背光技术的液晶电视时代向LED背光技术的液晶电视时代的转型。现在市场上最引人注目的两个发展方向,一个是由侧入式LED背光技术向直下式背光技术的转型,因为直下式LED背光技术中的灯珠个数大概仅为侧入式LED背光技术的四分之一,且不需要导光板,所以可以显著提高经济效益,另外灯珠个数的减少也代表整机功耗的下降,能效指数的提升;另一个发展方向是由普通功能电视机向智能电视机的转型,近年来安卓智能操作系统已经从手机屏幕慢慢向电视屏幕普及,消费者再也不用被动地接受电视节目了,他们可以在智能电视上看自己想看的影视节目,也可以在智能电视上玩游戏,浏览网页。本文的目的就是设计研发一款集以上两点先进技术为一身的32寸液晶电视产品。首先在设计直下式LED背光方案时,本文的目标是将整机能效指数提升到1级水平。为此,可以从降低功耗和增加屏幕平均亮度两个方面入手。为了降低功耗,本文选用了双曲面式透镜使灯珠发散脚扩大,从而减少灯珠个数,减少了整机功耗;选取了合适的灯珠工作电流,使LED灯的效能达到最佳。为了提高屏幕平均亮度,本文优化了灯珠的排布方式;选用了合适的增光膜片,并设计了软件自动调整被背光功率的算法。其次本文选用了 SN51DP芯片作为背光恒流源控制芯片,他可以解读接收到的不同占空比的PWM波,再输出不同的电流值,从而实现了软件控制背光电流的功能,有效降低了硬件板卡的种类,为生产提供了便利。最后本文选用了晨星半导体的MSD6M608安卓芯片为主芯片,设计电路原理图,搭建高效的安卓操作系统硬件平台。
[Abstract]:At present, the LCD TV industry has basically completed the transition from the era of CCFL backlight technology to the era of LED backlight technology.The two most striking development directions in the market now are the transition from side-in LED backlight technology to direct-down backlight technology, because the number of lamp beads in the direct-down LED backlight technology is only about 1/4 of the side-in LED backlight technology.There is no need for a light guide, so the economic benefits can be significantly improved. In addition, the decrease in the number of light beads also represents a decrease in the power consumption of the whole machine and an improvement in the energy efficiency index. Another direction of development is the transition from a common functional television to a smart television.In recent years, the Android smart operating system has become more and more popular from mobile screens to TV screens. Consumers no longer have to passively accept TV programs. They can watch the shows they want to watch on smart TV.You can also play games on smart TV and browse the web.The purpose of this paper is to design and develop a 32-inch LCD TV product which integrates the above two advanced technologies.Firstly, when designing the straight down LED backlight scheme, the goal of this paper is to raise the energy efficiency index of the whole machine to 1 level.To this end, we can reduce power consumption and increase the average brightness of the screen two aspects.In order to reduce the power consumption, the hyperboloid lens is used to enlarge the light bead divergence foot, thus reducing the number of lamp beads and reducing the power consumption of the whole machine, and the optimal efficiency of the LED lamp is achieved by selecting the appropriate working current of the lamp bead.In order to improve the average brightness of the screen, this paper optimizes the arrangement of the lamp beads, selects the appropriate light-increasing diaphragm, and designs an algorithm for automatically adjusting the backlight power of the software.Secondly, the SN51DP chip is chosen as the backlight constant current source control chip. It can interpret the received PWM wave with different duty cycle, and then output different current values, thus realizing the function of software controlling backlight current.Reduce the type of hardware card effectively, and provide convenience for production.At last, this paper uses Morningstar semiconductor MSD6M608 Android chip as the main chip, designs the circuit schematic diagram, builds the high efficiency Android operating system hardware platform.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN949.2

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