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1、本科生毕业设计英文文献及翻译题 目家用多功能仪器的设计姓 名 李元学 号 2 专 业 电子信息工程 指导教师 李亚梅英文文献及翻译班级：姓名：李元学号：212864LCDMonitorAtpresent,themarketmainstreamLCD(liquidcrystaldisplay)aredividedintothefollowingcategories:TN(twistedarraytype),STN(supertwistedarraytype),DSTN(DoubleSuperTwistedarray),
2、HPA(high-performancerapidaddressingorDSTN),TFT(thin-filmfield-effecttransistor)andsoon.ThemajorityofsmallhouseholdelectricalappliancesareusedinTN-typemonochromeliquidcrystaldisplays,Itsprincipleistohavealiquidcrystalfilledwithtwooutoftheplanebetweenthesmalltrough.Thet
3、woslotsontheplaneperpendiculartoeachother(intersectionintoa90°).Asthelightalongthedirectionofthespreadofthearrangementofelements,sowhenthelightthroughtheLCDreversed90°.Whentheliquidcrystalwhenavoltageincrease,theverticalelementswillbere-arrangedsothatlightcanbedirecte
4、dout,withoutanyreverse.ThisLCDisbytwoverticalpolarizationfilterconstitutes,therefore,undernormalcircumstancesshouldbetoblockallattemptstopenetratethelight.IftheDC-drivenLCD,displayunitswillcausepermanentdamage.Inordertopreventirreversibledamagetotheelectrochemicalreac
5、tionLCD,plusallthecharactersintheparagraphonthevoltagepolaritymustbereversedperiodicallysothattheparagraphbeaddedtothecharacteroftheaveragevoltageis0.Inordertosavesingle-chipI/Oportline,usingthemethodofmultiplexingdriveLCD.ST7920LCDcontroller/driverICcandisplayalphabe
6、ts,numbers,Chinesefontsandself-definedcharacters.Itsupports3kindsofbusinterface,namely8bit/4bitandserial.Allfunctions,includingdisplayRAM,charactergeneratorROM,LCDdisplaydriversandcontrolcircuitsareallinaone-chipsolution.Withaminimumsystemconfiguration,aChinesecharact
7、erdisplaysystemcaneasilyachieved.ST7920includescharacterROMwith819216X16dotsChinesefontsand12616X8dotshalfheightalphanumericalfonts.Alsoforgraphicdisplayitsupports64x256dotsgraphicdisplayarea（GDRAM）and240dotsICONRAM.ST7920hasbuiltin4setsCGRAMprovidingsoftwareprogramma
8、ble16X16font.ST7920haswideoperatingvoltage(2.7Vto5.5V)andlowpowerconsumptionsuitableforbatterypowerportabledevice.Itiseasyto
