Micro LED Pixel Wiring Layout to Prevent Color Mixture
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Solution Overview
Problem
Displays using micro light emitting diodes (micro LEDs) face challenges with red LEDs having lower luminous efficacy, requiring increased drive current, which can lead to power consumption issues and color mixture due to light reflection from the array substrate, affecting image quality.
Innovation Solution
A display device configuration where signal lines and power supply lines are arranged in different layers for certain pixels, reducing metal wiring occupancy and preventing light reflection, thereby enhancing image quality by minimizing color mixture and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If drive current for red LEDs is increased to improve luminous efficacy, then emission intensity is improved, but power consumption increases
Solution Approach 1:
The patent applies dimensionality change by separating signal lines and power supply lines into different layers. This vertical separation in the Z-dimension allows both lines to coexist without spatial conflict, enabling optimized current paths that reduce power consumption while maintaining emission intensity
2Illumination intensity
If emission intensity of red LEDs is increased, then luminous output is improved, but light reflection from wiring causes color mixture
Solution Approach 1:
By moving signal lines to a different layer than power supply lines, the patent eliminates planar overlap that causes light reflection and color mixture. The vertical separation prevents red light from reflecting off adjacent wiring, thereby preventing color mixture while maintaining high emission intensity
Solution Approach 2:
The patent introduces an intermediary structural arrangement where signal lines are positioned in a different layer, acting as a spatial mediator that prevents direct optical interaction between power supply lines and signal lines, thereby eliminating the harmful reflection effect
3Device complexity
If signal lines and power supply lines are in the same layer, then device complexity is reduced, but light reflection and color mixture occur
Solution Approach 1:
The patent resolves the contradiction by transitioning from a two-dimensional planar arrangement to a three-dimensional layered structure. This allows signal lines and power supply lines to be separated in the vertical dimension, preventing color mixture while adding only minimal structural complexity through layer stacking
Data Source
AI summary
A display device includes a substrate, a plurality of first pixels and a plurality of second pixels provided to the substrate, a plurality of inorganic light emitting elements provided to the respective first pixels and the respective second pixels, a plurality of signal lines configured to supply a signal to the first pixels and the second pixels, and a plurality of power supply lines configured to supply a power supply potential to the first pixels and the second pixels. At least one or more of the signal lines are provided in a layer different from a layer of the power supply lines in the first pixels, and the signal lines and the power supply lines are provided in the same layer in the second pixels.