Light-emitting Module Wiring Patterns for Uniform Luminance
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Solution Overview
Problem
Surface-emitting light sources with two-dimensionally arranged light-emitting elements often experience luminance unevenness due to variances in the brightness of individual LEDs, affecting image quality and illumination consistency.
Innovation Solution
A light-emitting module is designed with a wiring layer that includes specific wiring patterns and terminals, where the resistance of certain wiring patterns is adjusted to equalize electric currents flowing through light-emitting elements, ensuring uniform luminance by connecting them in parallel and series configurations, and using a light-guiding plate to direct light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple light-emitting elements are arranged in a plane to create a surface-emitting light source, then the light output coverage is improved, but luminance unevenness occurs due to variances in individual LED brightness
Solution Approach 1:
The patent applies local quality by creating different wiring patterns with different resistance values at different locations on the substrate. Specifically, wiring patterns closer to the center of the array have lower resistance than those at the periphery, compensating for the natural luminance drop-off and achieving uniform overall luminance across the surface-emitting light source.
Solution Approach 2:
The patent changes the resistance parameter of wiring patterns based on their position in the light-emitting element array. By adjusting the resistance values of different wiring patterns, the patent compensates for variations in individual LED brightness and achieves uniform luminance distribution across the entire array.
2Illumination intensity
If wiring patterns are added to equalize electric currents, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies equipotentiality by designing wiring patterns that create equal current flow conditions across all light-emitting elements. Through careful selection of resistance values and wiring configurations, the patent ensures that each light-emitting element receives an appropriate current to achieve uniform luminance, effectively creating an equipotential current distribution across the array.
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 effectively reduces luminance variances across the light-emitting module, resulting in a surface-emitting light source with uniform luminance and improved image quality, allowing for denser arrangement of light-emitting elements while maintaining consistent illumination.
Implementation Method 1
The wiring layer comprises a first terminal, a second terminal capable of receiving a lower voltage than a voltage applied to the first terminal, and a plurality of wiring patterns. The wiring patterns include: a first wiring pattern connecting the first terminal and the second terminal; a second wiring pattern connecting the first terminal and the second terminal; a third wiring pattern disposed between the first wiring pattern and the second wiring pattern to connect the first terminal and the second terminal
Implementation Method 2
a light-guiding plate, and a wiring layer. The light-guiding plate has a light-exiting surface and provided for the plurality of light-emitting elements
Data Source
AI summary
A light-emitting module according to an embodiment includes a plurality of light-emitting elements, light-guiding plates each having a light-exiting surface, and a wiring layer connected to electrodes of the plurality of light-emitting elements on a surface opposite to the light-exiting surface. The wiring layer includes a first terminal, a second terminal, a first wiring pattern connecting the first terminal and the second terminal, a second wiring pattern connecting the first terminal and the second terminal, a third wiring pattern disposed between the first wiring pattern and the second wiring pattern to connect the first terminal and the second terminal, a fourth wiring pattern connecting the first to third wiring patterns in parallel, the fourth wiring pattern being connected to the first terminal, and a fifth wiring pattern connecting the first to third wiring patterns in parallel, the fifth wiring pattern being connected to the second terminal.