Christie Digital Feedback Capacitor Design

Si Yu Feng and Yaxin Zheng
Case revision date: 
5 pages (Case Study)

Christie Digital Systems Inc. is a manufacturer of display technologies for cinema, business presentations, training facilities and other large audience environments. Christie is an international organization, with R&D and engineering teams located in Kitchener, Ontario. Christie’s Sirius team produces the next generation of high-performance, high brightness rear projection engines used in control rooms. Christie is currently developing the Christie® Entero™ HB, a next-generation rear projection engine for control rooms. Illustrated in Figure 1, the project uses ArraySync technology, which uses a colour matching algorithm to precisely, continuously and uniformly manage colour across large displays. Currently, the Christie® Entero™ HB is experiencing inconsistencies in measuring certain channels when different colour test patterns are applied. This is caused by conflicts that occur when different strobes of light are sent to the engine. The resistances in some channels are too high, causing errors. It has been determined that the capacitance must be adjusted to account for the differences.

Si Yu Feng, a third year electrical engineering coop student from the University of Waterloo, was given the responsibility of selection, analysis and recommendation of the ideal capacitance values for the colour sensor, with the goal of enhancing colour matching via improvement of settling time.
Christie Entero FB unit
Figure 1 - Christie® Entero™ FB unit with light engine and electronics module 
Learning objectives: 
This case study illustrates the engineering design process, and allows students to experience the development procedure that real-world engineering teams perform during development of new products. Additionally, this case study provides students with opportunity to make decisions based on their understanding of the reading material.
Key words: 
ArraySync; Analog-to-Digital Conversion (ADC); trans-impedance amplifiers
CEAB attributes: 
Investigation; A knowledge base for engineering; Use of engineering tools
Module 01 - Case Study
Module 02 - Needs Analysis and Risk Assessment
Module 03 - ArraySync
Module 04 - Testing and Analysis
Module TN - Teaching Note

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