DLPU066A March   2018  – April 2022

 

  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

4.1 Goal of Calibration

The end goal of the PGU calibration process is to generate a unique calibration file to be paired with each production PGU manufactured. This calibration file stores a series of look-up tables, each mapped to a different temperature, that are used by the Piccolo software to map input backlight values to system parameters. This calibration file will maintain an accurate color point for all brightness levels across temperature.

The calibration process for a DLP3030-Q1 based PGU has 3 main steps that make up the process from prototype through production.

Pre-production steps:

  • Calibration Pre-work: Coarse combination determination
  • Temperature characterization

Production steps:

  • Production PGU calibration

See Section 4.3 for more information, but it is helpful to understand background information on calibration file parameters before looking at the calibration procedure in more detail.