LED Light System Edge Color Uniformity Control
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Solution Overview
Problem
Linear light systems with diffusers often exhibit color variations near the edges compared to the middle, leading to non-uniform color emission when multiple systems are arranged side by side, as the mixing effects of light sources differ due to geometry and overlapping light patterns.
Innovation Solution
A light system with a color control unit that adjusts the light source control signals for modules near the edge differently than those in the middle, compensating for the unique mixing effects by varying the intensity of individual LEDs to ensure a uniform color output across the entire system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a diffuser is placed above LED pixels to blend light, then light mixing is improved, but color uniformity deteriorates at the edges compared to the middle
Solution Approach 1:
The patent applies local quality by differentiating the control of LED pixels based on their spatial location. Edge pixels are controlled with different intensity values compared to middle pixels to compensate for the reduced light mixing at edges. This is implemented through a control system that identifies pixel position and applies location-specific correction factors to maintain color uniformity across the entire display surface.
2Device complexity
If light source modules are arranged in a fixed linear configuration, then device simplicity is improved, but color consistency at boundaries deteriorates
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the intensity parameters of individual LED pixels based on their position. The control system modifies the drive current or PWM duty cycle for edge pixels versus middle pixels, changing the operational parameters to compensate for geometric light mixing differences. This allows the fixed linear configuration to maintain color consistency through intelligent parameter adjustment rather than physical reconfiguration.
3Area of stationary object
If multiple light systems are arranged side by side, then coverage area is improved, but color matching between adjacent systems deteriorates due to edge effects
Solution Approach 1:
The patent achieves equipotentiality by ensuring that all pixels, regardless of their location in the overall multi-system arrangement, contribute equally to the desired color output. The control system calculates and applies compensation values that make the effective light output per pixel position consistent across all adjacent systems. This creates a uniform color field across the entire expanded coverage area, eliminating visible boundaries or color mismatches between individually arranged light systems.
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
The solution enables the generation of a consistent desired color over the entire length of the light system, even when multiple systems are arranged together, by accounting for the distinct light mixing patterns at the edges and center.
Implementation Method 1
The light system can be provided with a diffuser above the different LED pixels light source module which serves to blend the light
Implementation Method 2
Each light source module comprises at least one light source emitting light of a predefined color
Data Source
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AI summary
The invention relates to a light system, which comprises a plurality of light source modules (110, 120) arranged in at least a row in a system housing (150) having an outer boundary (151, 152) and diffuser to which the light from the plurality of light source modules is emitted. Each light source module comprises at least one light source (111-113, 121-123) emitting light of a predefined color. The light emitted by each light source module is defined by the light emitted by the at least one light source of the corresponding light source module. Furthermore, the plurality of light source modules comprise at least one first light source module (120) which is located closer to the outer boundary (151, 152) of the system housing than second light source modules (110) of the plurality of light source modules which are located further away from the outer boundary (151, 152) than the at least one first light source module (120). The system furthermore comprises a color control unit (300) configured to control, for each of the light source modules of the light system, the at least one light source individually using a light source control signal. The color control unit (300) is configured such that, when a desired color is to be generated at the diffuser, it selects a first light source control signal for the at least one light source of the at least one first light source module (120) that is different from a second light source control signal selected for the at least one light source of the second light source modules (110).