DLPU066A March   2018  – April 2022 DLP3030-Q1

 

  1. 1Calibration Purpose
    1. 1.1 Calibration Purpose
    2. 1.2 Goal of Calibration
  2. 2Calibration Software and Tools
    1. 2.1 Calibration Software and Tools
  3. 3Calibration Setup
    1. 3.1 Calibration Setup
  4. 4Calibration Overview and Theory
    1. 4.1 Goal of Calibration
    2. 4.2 Calibration Background
      1. 4.2.1 Calibration File Parameters
      2. 4.2.2 Coarse Adjustment Parameter Combinations
    3. 4.3 Calibration Process
      1. 4.3.1 Calibration Pre-work: Coarse Combination Determination
      2. 4.3.2 Temperature Charaterization
      3. 4.3.3 Production PGU Calibration
  5. 5Calibration Pre-work
    1. 5.1 Pre-work Overview
    2. 5.2 Coarse Combination Determination
    3. 5.3 Strategically Adjusting Coarse Combination Parameters
      1. 5.3.1 LDC Index
      2. 5.3.2 Optical Sensor Feedback Gain
      3. 5.3.3 Current Limit
    4. 5.4 Coarse Combination Strategies
  6. 6Calibration Procedure
    1. 6.1 Calibration Procedure Overview
    2. 6.2 Calibration Sweep Setup and Coarse Combinations
    3. 6.3 Temperature Characterization
    4. 6.4 Production PGU Calibration
    5. 6.5 Generating a Calibration File
  7. 7Revision History

5.2 Coarse Combination Determination

The ultimate goal in determining proper coarse combinations is to allow the system to achieve a 5000:1 dimming ratio while maintaining a constant color point. Enough unique coarse combinations should be chosen so there are no brightness gaps in the system output, but should in practice be as few as possible to decrease calibration time. Three main problems arise when determining coarse combinations on a new DLP3030-Q1 based PGU.

  • Gaps in output brightness
  • Too much overlap between adjacent coarse combinations
  • Achieving minimum brightness targets
These issues can be addressed by strategically adjusting the coarse combinations.

GUID-EFDE9E40-D1E6-4019-9843-ED2AFC95348A-low.pngFigure 5-2 Closing brightness gaps between coarse combinations
GUID-38684C08-B290-4F05-B268-9FA63443D552-low.pngFigure 5-3 Removing heavily overlapping coarse combinations to decrease calibration time
GUID-2D74290E-EC23-4FF1-AA1D-6ED067AC0E32-low.pngFigure 5-4 Changing coarse combination parameters to change the maximum and minimum brightness ranges. Increase LDC Index, increase optical feeback gain, or decrease current limit to decrease the minimum brightness for a single coarse combination.