GaN Functional Panel Layout for Low-Leakage Micro-LED Pixels
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Solution Overview
Problem
Current display technologies using micro light-emitting diodes face challenges in achieving high luminance at low current density and reliability, particularly with organic compounds, which suffer from current leakage and uneven display characteristics.
Innovation Solution
A functional panel design incorporating a light-emitting element with gallium nitride, a color conversion layer, and a pixel circuit with an oxide semiconductor transistor, where the transistor is electrically connected through an opening in the insulating film, allowing for overlapping pixel circuits and reduced current leakage, and using additional insulating films to inhibit impurity diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If organic compounds are used for the light-emitting layer, then flexibility in material selection is improved, but current leakage increases and reliability deteriorates
Solution Approach 1:
The patent changes the material parameter from organic compounds to inorganic gallium nitride, fundamentally altering the material class to eliminate current leakage issues while maintaining light-emitting functionality. This parameter change resolves the reliability problem while preserving adaptability through the ability to choose different gallium nitride compositions and structures.
2Illumination intensity
If conventional light-emitting diodes are used, then light emission is achieved, but high current density is required which reduces efficiency
Solution Approach 1:
The patent changes the material composition parameter to gallium nitride, which enables high luminance output at lower current densities compared to conventional materials. This parameter change directly addresses the energy efficiency problem by reducing the current density requirement while maintaining or improving light emission intensity.
3Ease of manufacture
If pixel circuits are placed adjacent to light-emitting elements, then manufacturing is simplified, but display unevenness increases due to operation characteristics distribution
Solution Approach 1:
The patent moves the pixel circuit from a planar adjacent arrangement to a three-dimensional overlapping arrangement where the circuit is positioned above the light-emitting element. This dimensional change allows the circuit to be electrically connected through an opening in the insulating film while being spatially separated, reducing the impact of circuit operation variations on display uniformity while maintaining manufacturing simplicity.
4Reliability
If insulating films are added to separate pixel circuits from light-emitting elements, then impurity diffusion is prevented and reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces an insulating film as an intermediary layer between the pixel circuit and the light-emitting element. This intermediary serves multiple functions: providing electrical isolation, preventing impurity diffusion, and enabling the overlapping three-dimensional arrangement. The insulating film is a standard component in semiconductor manufacturing, so while it adds a layer, it does not significantly increase overall device complexity.
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 achieves high luminance at low current density, improves reliability, and reduces display unevenness by stabilizing pixel circuit operation and preventing impurity diffusion, resulting in a more convenient, useful, and reliable display device.
Implementation Method 1
The first element has a function of emitting light and contains gallium nitride
Implementation Method 2
The color conversion layer has a function of converting the color of light emitted from the first element into a different color
Data Source
AI summary
A novel functional panel that is highly convenient or highly reliable is provided. The functional panel includes a first pixel. The first pixel includes a first element, a color conversion layer, and a first functional layer. The first functional layer is positioned between the first element and the color conversion layer. The first element has a function of emitting light and contains gallium nitride. The color conversion layer has a function of converting the color of light emitted from the first element into a different color. The first functional layer includes a first insulating film and a pixel circuit. The first insulating film includes a region positioned between the pixel circuit and the first element, and has an opening. The pixel circuit includes a first transistor. The first transistor includes a first oxide semiconductor film and is electrically connected to the first element through the opening.