08DLP投影机基本原理.ppt

投影机基本原理 概要 DLP光学原理及故障判断 电路原理及维修判断 以PB8为例分析 BENQ Confidential (2004/12/15) ?2004, BENQ Corporation DLP系统 DLP光学架构 DLP? One Chip Compact, Lightweight Auto Convergence Lower Cost DLP? Three Chip High ImageQuality High Efficiency Higher Cost Projection Lens（镜头） DMD Concave Mirror（凹面镜） Fold Mirror（反射镜） A/Spherical Lens（球面镜） Light Pipe（光管） Color Wheel（色轮） Lamp（灯泡） 光学组件 Lamp: Illumination Source光源 UV/AR(IR): Reduce UV(IR) Light吸收紫红外光 CW: Color Generation提供颜色 LP: Enhance Light Uniformity将光线均匀化 SL, AL, CM: Illumination (Re-lay) DMD: Heart of DLP System Projection Lens: Imaging System投射画面 各组件功能 DMD ? Chip Pixel DMD? Pixel结构 转轴 电极 金属垫 Incident light Stray light Light contain image Lens DMD Action Theory 灯泡（光源） Light Intensity by O-scope 分色轮 CW and Lamp High quality dichromic coating Match with lamp spectrum Match with lamp incident angle Withstanding Heat accumulated on color wheel (by focus) Color Wheel Points of the triangle represent the set of all colors reproducible by the projector Many video sources use SMPTE 240 color standard to record their media To accurately display the image as it was recorded the projector should replicate this color gamut 色谱图 How DLP? Work What Light Pipe do DLP?光学系统 光学部分故障判断 1. 亮度 (B) 亮度 = 光源亮度 * 光机效率 光源: Lamp 光机效率: Lamp 与LP 的层靠面 LP 层靠面, Lamp层靠面, OPT Eng.层靠面 涂层 – CW 传送率; 零件反光涂层效率 Over-fill Size LP Dimension, Illumination Lens … etc 其它零件的相对位置 M.E Alignment (Component Tilt/Shift) 2.亮度均匀度 (BU) 灯芯偏离度 LP位置 其它零件的相对位置 LP Lens DMD Screen Lamp N.F Intensity Distribution Light Intensity Distribution after LP 3. 颜色 (1) Lamp 色温 (2) CW 涂层 (3) 灰尘 5. Focus (1) 放映镜头 (2) DMD 层靠面 (3) Projection Lens 层靠面 4.对比度 (C/R) FOFO C/R: (Full-on/Full-off) ANSI C/R 使用标准画面测试 检查DMD Chip PL上的灰尘 （零件本生的问题） 1.Power Supply Module , Ballast Lamp 2.Main Board 3.DMD Board 4.DMD CHIP Board 5.FPC BD 6.DC-DC BD 7.Fan Control Board 8.Keypad Board 9.Thermal Sensor Board Electrical Feature Hardware Structure PB8整机架构 Power Supply Module,Ballast Lamp Main Board Block Di