Solid State Lighting Panel Thermal Protection

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Solution Overview

Problem

Solid state lighting panels, particularly used in LCD displays, face issues with power dissipation and temperature exceeding design specifications, leading to potential component degradation due to inadequate control over luminance settings, resulting in inefficient lighting with low color rendering index and potential damage from excessive power or heat.

Innovation Solution

A lighting panel system that includes a protection mechanism to adjust luminance settings based on real-time power dissipation and temperature calculations, incrementally reducing power or setting to minimum values when limits are exceeded, utilizing a microcontroller and pre-computed power values to manage PWM duty cycles and maintain optimal operating conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If solid state lighting panels use high power dissipation to achieve desired luminance, then illumination intensity is improved, but temperature increases causing component degradation

Engineering Contradiction:

ImproveluminanceVSAvoidpanel temperature

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The patent implements dynamic luminance adjustment by continuously monitoring panel temperature and power dissipation, then iteratively modifying luminance settings in real-time. The control system dynamically adapts the lighting output based on current operating conditions, transitioning from static to dynamic operation to prevent thermal damage while maintaining optimal illumination.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system employs feedback control by measuring actual panel temperature and power dissipation, comparing these values against safe operating limits, and adjusting luminance settings accordingly. This closed-loop feedback mechanism ensures the lighting panel operates within safe thermal boundaries while maximizing illumination output.

Inventive Principle:

Principle #23Feedback

2Illumination intensity

If solid state lighting panels operate at high power dissipation, then luminance output is improved, but reliability decreases due to component degradation

Engineering Contradiction:

ImproveluminanceVSAvoidcomponent reliability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent establishes predetermined safe operating limits for power dissipation and temperature before damage occurs. By setting these protective thresholds in advance and monitoring against them continuously, the system cushions components from adverse operating conditions, preventing degradation before it happens rather than reacting after damage occurs.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

Through continuous monitoring of power dissipation and temperature with feedback control, the system detects approaching dangerous conditions and adjusts luminance settings proactively. This feedback mechanism maintains reliable operation by preventing operation beyond safe boundaries that would cause component degradation.

Inventive Principle:

Principle #23Feedback

3Ease of manufacture

If phosphor-based solid state light sources are used to reduce cost, then manufacturing cost is improved, but color rendering index deteriorates

Engineering Contradiction:

Improvemanufacturing costVSAvoidcolor rendering index

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent dynamically changes the luminance parameters of different color channels (red, green, blue) to compensate for the limited spectrum of phosphor-based LEDs. By adjusting the intensity ratios and spectral composition in real-time based on measured color rendering performance, the system improves color accuracy while maintaining the cost advantages of phosphor-based technology.

Inventive Principle:

Principle #35Parameter changes

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

This solution effectively reduces the risk of component degradation by dynamically managing luminance to stay within safe power and temperature limits, improving color rendering and extending the lifespan of display components while maintaining adequate lighting performance.

Implementation Method 1

a solid state light emitting device generates light through the recombination of electronic carriers, i.e. electrons and holes, in a light emitting layer or region

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

white LED lamps that include a blue-emitting LED coated with a wavelength conversion phosphor that converts some of the blue light emitted by the LED into yellow light

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 3

PWM schemes pulse the solid state lamps alternately to a full current 'ON' state followed by a zero current 'OFF' state

Methodology Applied

Scientific EffectPulse Width Modulation:

Data Source

PatentUS8829820B2Systems and methods for protecting display components from adverse operating conditions

Publication Date: 2014.09.09 BRIGHTPLUS VENTURES LLC

AI summary

Provided are systems and methods for protecting display components from adverse operating conditions. A lighting panel system according to some embodiments includes a lighting panel including a plurality of strings of solid state lighting devices arranged across the panel and a protection system configured to determine an adverse operating condition and adjust a lighting panel luminance setting responsive to the adverse operating condition.