Micro LED Pixel Wiring Layout to Prevent Red 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 minimizing light reflection, thereby preventing color mixture and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the drive current for red LEDs is increased to improve luminous efficacy, then the emission intensity of red LEDs is improved, but power consumption increases
Solution Approach 1:
The patent applies different layer configurations for signal lines specifically in red LED pixels versus other pixels. Red LED pixels have signal lines in different layers from power supply lines to reduce reflection, while other pixels may use the same layer. This localized differentiation addresses the specific needs of red LEDs without affecting other pixels, allowing targeted improvement of red LED emission intensity while controlling overall power consumption.
Solution Approach 2:
The patent utilizes the vertical dimension by arranging signal lines and power supply lines in different layers for red LED pixels. This three-dimensional wiring approach separates the signal and power paths vertically, reducing electromagnetic interference and light reflection issues that would otherwise require increasing drive current, thereby addressing power consumption concerns.
2Illumination intensity
If the emission intensity of red LEDs is increased, then the luminous efficacy is improved, but red light is reflected by wiring on the array substrate causing color mixture
Solution Approach 1:
The patent moves signal lines to different layers from power supply lines in red LED pixels, creating vertical separation that prevents red light emitted from the LED from reflecting off the wiring. This three-dimensional arrangement eliminates the harmful reflection effect while maintaining high emission intensity, as the light path and wiring are separated in the vertical dimension.
Solution Approach 2:
The patent segments the wiring structure into distinct layers for signal lines and power supply lines specifically in red LED regions. This segmentation separates the optical path from the electrical wiring, preventing color mixture caused by reflection while allowing other pixels to use more compact same-layer configurations.
3Device complexity
If signal lines and power supply lines are arranged in the same layer, then the device complexity is reduced, but light reflection occurs causing color mixture
Solution Approach 1:
The patent applies different wiring configurations locally: red LED pixels use multi-layer arrangements with signal lines in different layers from power supply lines to prevent reflection, while other pixels can use simpler same-layer configurations. This localized approach reduces overall device complexity while eliminating harmful reflection effects where they would occur.
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.