Display Pixel Compensation for Thermally Induced Brightness Drift

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Solution Overview

Problem

Thermally induced non-uniform light output variation in electronic displays leads to image distortion and ghosting due to non-uniform heating of light-emitting elements, exacerbated by higher intensity and resolution demands, necessitating improved heat dissipation methods.

Innovation Solution

Digitally compensate for thermally induced light output changes by dynamically adjusting pixel output based on expected temperature and heat generation, accounting for content-specific light output requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If light-emitting elements operate at higher intensity to meet resolution and brightness demands, then display brightness and resolution are improved, but heat generation increases causing non-uniform temperature distribution and light output variation

Engineering Contradiction:

Improvedisplay brightnessVSAvoidtemperature uniformity

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The system performs preliminary thermal modeling to predict future temperature distributions before they occur. By analyzing historical temperature data and current display content, the system pre-calculates compensation values that will counteract expected thermal effects, applying them proactively rather than reactively to maintain uniform light output.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements a feedback loop where actual temperature measurements from sensors are continuously compared against modeled temperature predictions. This feedback information is used to refine the thermal model and adjust compensation values in real-time, ensuring accurate compensation despite variations in display content and environmental conditions.

Inventive Principle:

Principle #23Feedback

2Temperature

If complex heat dissipation systems are implemented to manage thermal effects, then temperature uniformity is improved, but device complexity and cost increase

Engineering Contradiction:

Improvetemperature uniformityVSAvoidheat dissipation system complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The system replaces complex mechanical thermal management components (such as heat sinks, fans, and thermal conduction structures) with a digital compensation approach. By using computational algorithms to predict and compensate for thermal effects on light output, the system achieves temperature uniformity without requiring elaborate physical heat dissipation infrastructure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system changes the operational parameters of light-emitting elements dynamically based on predicted temperature effects. By adjusting drive currents, duty cycles, or emission timings of individual pixels or groups of pixels, the system compensates for thermal-induced light output variations without physically altering the thermal environment.

Inventive Principle:

Principle #35Parameter changes

3Duration of action of moving object

If static images are displayed for long periods to meet content requirements, then information display is improved, but thermal accumulation causes ghosting and image degradation

Engineering Contradiction:

Improvedisplay durationVSAvoidimage quality

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The system applies periodic refresh cycles even when displaying static content, subtly modulating the display update timing to allow thermal dissipation between frames. This periodic action prevents continuous thermal accumulation while maintaining the appearance of static imagery, thereby preventing ghosting and image degradation during long-duration displays.

Inventive Principle:

Principle #19Periodic action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Reduces image distortion, allows brighter display operation, and minimizes the need for complex heat dissipation systems, thereby reducing costs and complexity.

Implementation Method 1

The light-emitting elements used in the electronic displays generate heat, which increases the temperature of the light-emitting elements during operation of the electronic display

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

Increased temperature has been known to reduce the light intensity that the light-emitting elements are capable of emitting

Methodology Applied

Scientific EffectThermal reduction of light intensity:

Data Source

PatentUS12562104B2Dynamic compensation for thermally induced light output variation in electronic displays

Publication Date: 2026.02.24 DAKTRONICS INC

AI summary

A method comprises producing or receiving information regarding content to be displayed on an array of pixels as a function of time, wherein the information includes a specified light output for each pixel in the array as a function of time, determining an expected change in light output intensity for each of one or more of the pixels as a function of time, wherein the expected change in light output intensity for each of the one or more of the pixels is dependent, at least in part, on the specified light output for at least a portion of the pixels in the array, and modifying an output of each of the one or more of the pixels as a function of time to compensate for at least a portion of the expected change in the light output intensity.