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DLP Projector ※본자료는 사내용으로 TI 사의 발표장표에서 일부 발췌하였습니다.

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Presentation on theme: "DLP Projector ※본자료는 사내용으로 TI 사의 발표장표에서 일부 발췌하였습니다."— Presentation transcript:

1 DLP Projector ※본자료는 사내용으로 TI 사의 발표장표에서 일부 발췌하였습니다.

2 1.What is DMD? 2.DLP projector - Why should we choice DLP projector? - Optical configurations - Optical elements 3. How it works? - FSC - SCR Agenda

3 DMD: Digital Micromirror Device Beginning to be developed by sight change according to the movement of Rear View Mirror Number of moving parts (SVGA) to >1.3 (TBA) million Mechanical motion Makes discrete contacts or landings Lifetime up to 100,000 hrs Address voltage volt CMOS technology Mechanical elements Aluminum Process Low temperature, sputter deposition, plasma etch (standard SC processes) Package (Type A) Optical, hermetic, welded lid Mirror Address Electrode YokeBias/Reset Bus Metal Address Pads Tilting Angle: ±10˚ ±12˚ 1. What is DMD ?

4 Expressing light and shade by changes of selected light by path Mirror Tilting Expressing Gray level by times taken for path change 1. What is DMD ?

5 Why should we choice DLP projector? 2. DLP Projector – Why should we choice DLP projector? Image Quality Pixelization - Pixelization (fill factor) DLP= ‘Seamless’, Filmlike LCD= Grainy, Pixellated Contrast Ratio - Contrast Ratio DLP= simple optics: easier light management LCD= complex optics: more difficult light management Sharpness - Sharpness (color alignment) DLP= no misalignment LCD= misalignment likely over time Video Quality - Video Quality DLP= fast switching: minimal ‘lag’ (few μs) LCD= slow switching: significant ‘lag’ (tens of ms)  smearing for fast moving video DLP™ = large ‘active’ area LCD = smaller ‘active’ area DLP™LCD

6 Why should we choice DLP projector? 2. DLP Projector – Why should we choice DLP projector? Color Quality - Color Quality DLP= can match any LCD color gamut LCD= can’t match any DLP color gamut R,G,B Bandwidth is depend on each color because of non-sequential system - Smallest & Brightest DLP= simple optical system, good reflectivity LCD= complex optical system wavelength LCD wavelength DLP TM LCD

7 Why should we choice DLP projector? 2. DLP Projector – Why should we choice DLP projector? Repeatable Performance (digital accuracy) DLP= digital: precise control, constant performance over time LCD= analog: variable (affected by temperature, vibration, heat, humidity), deterioration over time Reliable - Superior thermal characteristics DLP= reflects heat LCD= absorbs heat, performance degrades - LCD panel degrades as a function of both time and use - DMDs have shown consistent robust performance over time with up to 100,000 hours lifetime StartLCDDLP

8 Number of DMD Optical configurations 2. DLP Projector – Optical configurations 1 Chip DLP3 Chip DLP

9 Optical Configurations 2. DLP Projector – Optical Configurations TIR prism Non TIR Prism DLP TIR Prism DLP

10 Optical Configurations 2. DLP Projector – Optical Configurations TIR prism Non TIR Prism DLPTIR Prism DLP

11 Reflector (Elliptical Surface) Lamp Front Glass (UV Cut Coating) Mirror Color Drum (R,G,B,W segment) ※ Color Wheel Condenser Lens C3 (Aspherical Surface) DMD Panel Projection Lens TIR Prism (Total Internal Reflection) Condenser Lens C2 Condenser Lens C1 Aperture Integrating Rod Optical elements 2. DLP Projector – Optical elements

12 (1) Lamp & Reflector a. Output Voltage - AC Type : PHILIPS, OSRAM, IWASAKI, THOSHIBA …. - DC Type : USHIO … b. Reflector - Elliptical Type : Almost of all DLP Projector Smallest size= Φ33mm, ‘Bami’ lamp made by Philips - Parabolic Type : Used with condensor lens. Some of AV Projector Elliptical ReflectorParabolic Reflector Optical elements 2. DLP Projector – Optical elements

13 (2) UV Cut Filter - UV causes heat for some parts. (Coating, Plastic, Bonding) - On UV Cut Coating, Try not to make the reflected light be concentrated on one point of UV Lamp Material: Borofloat + UV Coating Optical elements 2. DLP Projector – Optical elements Reflected UV light

14 (3) Rod Integrator - through internal reflects, it makes uninformative incident light distribution “rectangular uninformative light” Type: Solid Rod – Glass or Plastic Light Tunnel – Mirror Light Distribution from the input Light Distribution from the output Avd: good transmission. Strong against heat DisAvd: easy to broken, easy to get dust, long Avd: easy to install, dust free, Short DisAvd: less transmission, weak for heat inout Optical elements 2. DLP Projector – Optical elements

15 (3) Color Drum & Wheel Optical instrument filtering color by Color Filter assembled with Motor \ Optical elements 2. DLP Projector – Optical elements

16 (4) Illumination Lenses It guides lights from Rod Integrator into valid dimensions of DMD f1f1 f1f1 f2f2 f2f2 h h’ θ θ’ t L1L1 L2L2 L1 L2 R1R4 R5R6 R2R3 (m)= h’ / h = f 2 / f 1 (t)= 2*(f 1 +f 2 ) f1 = 9.53, f2 = ※ m = 2.39 배 Optical elements 2. DLP Projector – Optical elements

17 (5) Mirror It changes light path or controls light position on DMD Optical elements 2. DLP Projector – Optical elements

18 (5) (TIR Prism) Using air gaps between two prism, it makes selective reflect of transmission in out in out air gap DMD Panel TIR Prism DMD Panel Optical elements 2. DLP Projector – Optical elements

19 (5) Projection Lens It transmit Active Area of DMD on Screen Fixed Focus Lens – Cannot control the zoom in Fixed distance Variable Focus Lens (Zoom Lens) – Can control the screen size with zoom in Fixed distance Used in DLP Engine with TRI PrismUsed DLP Engine with Non-TIR Prism DMD Screen DMD Screen Optical elements 2. DLP Projector – Optical elements

20 FSC 3. How it works? – FSC Color Filtering by Rotating of Color Wheel Color Wheel 에 광이 입사하는 경우에는 일정한 형태의 크기를 가지고 있기 때문에 그 부분에 아래 그림과 같이 Color Filter 들의 경계부위가 위치하는 경우 혼합 색이 되어 사용할 수 없다. ( 단 DLP 에서 White Peaking Mode=0 인 경우 ) 그러므로 순색을 표현할 수 있는 시간이 길면 길 수록 Gray Ramp 의 표현이 부드러워지고 순색의 밝기 또한 증가한다. time for one field Pure G timePure W timePure R timePure B time Mixed Color time

21 FSC 3. How it works? – FSC Operation In case of transmitting Red Filter, Green and Blue is reflected and is useless Blue and Green light turned into heat Color Wheel Red light transmitted 33% efficiency ※ FSC=Field Sequential Color Lighting on DMD in timely sequence

22 FSC 3. How it works? – FSC Brief Brightness Estimation 1) RGB Segment ( W=1, R:G:B Intensity= 1/3, R:G:B segment size= 1:1:1) R = 1/3 G = B = 1/3 RGB size = 1/3 : Wo = R/3 + G/3 + B/3 = ) RGB Segment ( W=1, R:G:B Intensity= 1/3, R:G:B:W segment size= 1:1:1:1) R = 1/3 G = B = 1/3 W = 1 RGB size = 1/4 Wo = R/4 + G/4 + B/4 + W/4 = 0.500

23 SCR 3. How it works? – SCR Operation Integrating Rod 의 출사측에 Color Filter 가 위치하며, 출사면의 Size 안에 RGB Segment 를 모두 포함한다 Integrating Rod 에 입사된 백색광은 RGB Segment Filter 에 의해 해당 RGB 색은 투과된다.RGB 색이 투과하고 CMY 색은 반사되어 Integrating Rod 의 입사측으로 되돌아간다. 반사된 CMY 색은 Integrating Rod 의 입사측의 Mirror 면에 의해 다시 RGB Filter 에 입사하게 된다.RGB Filter 에 의해 CMY 색은 해당 RGB 색을 투과되고 나머지 RGB 색은 다시 반사된다. ※ SCR= Sequential Color Recapture Scroll Lighting Whole RGB on DMD in timely sequence Reflected RGB is re-reflected by Integrating Rod IN and transmitted by RGB Filter

24 SCR 3. How it works? – SCR Brief Brightness Estimation Integrating Rod : Total size vs Hole Size ratio = 0.5 Total size Input vs Hole Input Intensity Ratio = )RGB Segment ( Wi=1, R:G:B Intensity= 1/3, R:G:B segment size= 1:1:1) R = first transmission R(0.85*1/3) + G,B reflected MY of re-reflected R(0.85*0.5*2/3*1/3*2) = G,B is same as above G=B= RGB size = 1/3 Wo = R/3 + G/3 + B/3 = ) RGB Segment ( W=1, R:G:B Intensity= 1/3, R:G:B:W segment size= 1:1:1:1) R = first transmission R(0.85*1/3) + G,B reflected MY of re-reflected R(0.85*0.5*2/4*1/3*2) = G,B is same as above G = B = W = 1 RGB size = 1/4 Wo = R/4 + G/4 + B/4 + W/4 = 0.569


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