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Mpt presentation by manish abraham


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various test benches for a projector

various test benches for a projector

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  • 1. MEASURING & TESTINGBEAMER / PROJECTOR. Manish Abraham & Reinhard Pollhamer
  • 2. Table of Contents Product Description. Technical Aspects. LCD Memory Effect. Humidity and Temperature. Cooling Fan Defect. Lamp Durability.
  • 3. Product Description Video projector  Receives a video signal from TV-receiver, PC, BluRay- Player, gaming console etc.  Projects the pictures on a projection screen.  Uses a lens system.
  • 4. Product Description Lens system of a LCD-Projector.
  • 5. Technical Aspects Light output  measured in lumens.  from 1500 lm for small rooms with low ambient light up to over 4000 lm for big screens and/or no lighting control. Resolution  common resolutions are 800x600, 1024x768, 1280x720 and 1920x1080 pixels.  other formats have to be scaled.
  • 6. Technical Aspects Picture deformation  when projector has a horizontal or vertical offset to the projection screen.  digital or analog correction. Temperature and noise  heat is produced by the lamp.  fans are needed to protect from overheating.
  • 7. What could be tested? LCD Memory Effect. Button durability. Remote control (distance, obstacles). Lamp durability (3000-6000h; On/Off). Humidity and temperature differences. Defect of cooling fan. Light output (decreasing over lifespan).
  • 8. What is to be tested? LCD Memory Effect: places on the lense can get darker if they are exposed to bright pictures. Lamp durability: lamp is designed for 5000 operating hours. Humidity and Temperature: the projector should be resistant to inside as well as outside conditions. Defect of cooling fan: overheating of critical components should be prevented.
  • 9. LCD Memory Effect Test To give an idea of different test parameters, I would like to show a presentation on different parameters and then show our test.
  • 10. LCD Memory Effect 2 test pictures Testing durations: 15 / 30 / 45 / 60 / 70 / 80 / 90 / 100 / 120 / 150 / 180 minutes
  • 11. LCD Memory Effect Results  Check image quality of a pure black respectively pure white image after each time period.  Protocol at which time and place/color the effect occured.
  • 12. LAMP DURABILITY The Lamp inside a Projector.
  • 13. Lamp Durability Lamp should endure 5000 hours of usage (>200 days). Long time usage and many Power-On/Off procedures have a bad influence on durability. To shorten the test time the projector is switched On/Off frequently.  Randomized On/Off-signals or fixed values.
  • 14. Humidity and Temperature Intended temperature range for use  between -5° C and +40° C Intended humidity range for use  between 20 and 90 % Protocol sheet with intervals  shorter intervals at critical temp. or humidity levels Test environment  climate chamber
  • 15. Humidity and Temperature Humidity [%] Temperature [°C] Status 20 20 OK 40 20 OK 60 20 OK 70 20 OK 75 20 … 80 20 … 85 20 … 90 20 … 92 20 … 94 20 …
  • 16. Cooling Fan Defect System must shut down before overheating Temperature sensors in the projector case
  • 17. Cooling Fan Defect 1st task: find the critical temperature. 2nd task: configure the built-in temperature sensor. 3rd task: test if the system shuts down when the critical temperature is reached.
  • 18. Questions ?????