使用查找表执行伽玛校正上的LED

摘要：Gamma校正用于纠正亮度和亮度之间的非线性关系。本应用笔记介绍MAXQ2000微控制器（μC）的固定频率PWM信号线性增加和减少LED的亮度，使用伽玛校正书面汇编程序。PWM占空比，位于实用ROM的内存在一个查找表（LUT）的存储，伽玛纠正，以产生线性亮度变化。使用免费的MAX-IDE开发工具软件编译和MAXQ2000评估板上运行。

Maxim>AppNotes>DISPLAYDRIVERSKeywords:microcontrollers,assembler,LUT,look-uptable,gammacorrectionNov16,2005APPLICATIONNOTE3667UsingLookupTablestoPerformGammaCorrectiononLEDsAbstract:Gammacorrectionisusedtocorrectforthenonlinearrelationshipbetweenluminanceandbrightness.ThisapplicationnotepresentsanassemblyprogramwrittenfortheMAXQ2000microcontroller(C)thatusesgammacorrectionwithafixed-frequencyPWMsignaltolinearlyincreaseanddecreasethebrightnessofanLED.ThePWMdutycycles,storedinaLookupTable(LUT)locatedinUtilityROMmemory,aregammacorrectedtoproducelinearbrightnesschanges.ThesoftwarecompilesusingthefreeMAX-IDEdevelopmenttoolandrunsontheMAXQ2000evaluationkit.