Color Correction Matrix for Display Manufacturing Variance

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Solution Overview

Problem

Manufacturing variances in display systems lead to visually noticeable differences in image color casts compared to the golden projector, making it challenging to achieve consistent image quality across multiple display units.

Innovation Solution

A method and system for computing color correction coefficients by measuring output color values, receiving desired color values, and creating a color correction matrix to modify light engine commands, ensuring that the displayed colors match the golden projector's standards, using an array of light modulators, a controller, and an optoelectric sensor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If manufacturing processes are used to create display systems, then production volume increases, but manufacturing variances cause color inconsistency between display systems

Engineering Contradiction:

Improveproduction volumeVSAvoidcolor consistency

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by pre-computing color correction coefficients during the manufacturing process and storing them in lookup tables within the display system. This allows color correction to be automatically applied during operation without requiring manual adjustment, thereby maintaining color consistency across mass-produced units while enabling high production volume.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the parameter of color output by computing correction coefficients that adjust the color values based on measured manufacturing variances. These coefficients modify the relationship between input signals and output colors, allowing each display system to compensate for its specific manufacturing differences and achieve consistent color performance across production batches.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If manual tweaking is performed on each display system to match golden projector standards, then color accuracy improves, but production time and complexity increase

Engineering Contradiction:

Improvecolor accuracyVSAvoidproduction time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent implements self-service by enabling display systems to automatically perform color correction using pre-computed coefficients stored in their internal memory. Each system measures its own color output and applies corrections without requiring external manual intervention, thereby achieving golden projector standards efficiently during mass production without increasing production time.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces manual mechanical tweaking with an automated computational system. Instead of physically adjusting components, the system uses software-based color correction algorithms that automatically compute and apply correction coefficients, eliminating time-consuming manual processes while maintaining or improving color accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Speed

If color correction coefficients are pre-computed and stored in lookup tables, then color correction speed improves, but memory requirements increase

Engineering Contradiction:

Improvecolor correction speedVSAvoidmemory storage capacity

Core Design Contradiction:

SpeedVSQuantity of substance

Solution Approach 1:

The patent applies segmentation by dividing the color correction data into separate lookup tables for different color channels (red, green, blue) and potentially different operating conditions. This allows the system to store correction coefficients in a structured manner, enabling fast retrieval through indexing while optimizing memory usage by only storing necessary correction data for each segment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses fixed lookup tables with predetermined size and structure that can be easily stored in standard memory components. Rather than implementing complex adaptive algorithms requiring large memory, the system uses simplified correction data structures that occupy minimal memory space while providing sufficient correction accuracy for practical applications.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS7737989B2System and method for computing color correction coefficients

Publication Date: 2010.06.15 TEXAS INSTRUMENTS INC

AI summary

System and method for computing coefficients for color correcting rendered colors used in displaying images. A preferred embodiment comprises measuring color values of light output for a display system, receiving color values of desired colors, and computing a color correction matrix based on the measured color values and the input color values. The color correction matrix may be used to modify color commands to a light engine of the display system. The modifications to the color commands permit the storage and use of a set of color commands designed for a reference display system, simplifying display system design and manufacture.