Four-Subpixel Micro LED Architecture for Power Reduction
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Solution Overview
Problem
GaN-based micro-LED displays face inefficiencies in power consumption due to low efficiency of red LEDs, leading to higher power consumption when displaying white color, which is a significant issue in achieving low power consumption and improved color gamut in micro-LED displays.
Innovation Solution
Implementing a pixel architecture with four subpixels: red, orange, green, and blue, where orange LEDs are used to satisfy a significant portion of the red-emission requirement for white color, reducing power consumption by leveraging more energy-efficient orange GaN-based LEDs instead of conventional red LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional red LEDs are used in micro-LED displays, then the display can achieve white color emission, but power consumption increases significantly
Solution Approach 1:
The pixel is segmented into four subpixels (red, orange, green, blue) instead of conventional three subpixels. The orange subpixel is specifically added to share the burden of white color emission with the red subpixel, reducing the power consumption of each individual subpixel while maintaining overall display performance
Solution Approach 2:
The invention changes the spectral parameters by introducing orange LEDs with wavelengths between 580-620nm into the display system. This parameter change allows for more efficient power utilization since orange LEDs have higher external quantum efficiency compared to red LEDs in the GaN-based system
2Use of energy by moving object
If orange LEDs are added to satisfy red-emission requirement, then power consumption decreases, but device complexity increases
Solution Approach 1:
The pixel is segmented into four subpixels (red, orange, green, blue) instead of conventional three subpixels. The orange subpixel is specifically added to share the burden of white color emission with the red subpixel, reducing the power consumption of each individual subpixel while maintaining overall display performance
Solution Approach 2:
The orange subpixel serves multiple functions: it contributes to white color emission, provides redundancy for color accuracy, and reduces overall power consumption. This multi-functionality justifies the additional complexity by delivering multiple benefits from a single added component
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 approach results in lower power consumption and improved color gamut, achieving up to two-fold less power usage compared to organic LED displays, enhancing battery life and user experience in portable electronics.
Implementation Method 1
A plurality of micro light emitting diode devices in a second dielectric layer above the first dielectric layer, the plurality of micro light emitting diode devices including an orange micro light emitting diode device, a green micro light emitting diode device, and a blue micro light emitting diode device
Data Source
AI summary
Pixel architectures for low power micro light-emitting diode displays are described. In an example, a micro light emitting diode pixel structure includes a substrate having a plurality of conductive interconnect structures in a first dielectric layer thereon. A plurality of micro light emitting diode devices is in a second dielectric layer above the first dielectric layer, individual ones of the plurality of micro light emitting diode devices electrically coupled to a corresponding one of the plurality of conductive interconnect structures. The plurality of micro light emitting diode devices includes an orange micro light emitting diode device, a green micro light emitting diode device, and a blue micro light emitting diode device. A transparent conducting oxide layer is disposed on the plurality of micro light emitting diode devices and on the second dielectric layer.