GaN Micro LED Functional Panel with Nested Driver Circuit
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Solution Overview
Problem
Existing display technologies using micro light-emitting diodes face challenges in efficiently managing current density, which affects chromaticity, and require complex pixel circuits, leading to increased area occupation and potential operational malfunctions due to impurity diffusion.
Innovation Solution
A functional panel design incorporating a light-emitting region with gallium nitride material, a first functional layer with insulating films, and a second functional layer with driver circuits, allowing for passive driving of pixels without a pixel circuit, reducing area occupation and inhibiting impurity diffusion, while enabling efficient color conversion and high-density pixel arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex pixel circuits are used to manage current density, then chromaticity control is improved, but area occupation increases and reliability decreases due to impurity diffusion
Solution Approach 1:
The patent extracts the pixel circuit from the pixel structure itself, placing the driver circuit in a separate functional layer below the light-emitting region. This separation eliminates impurity diffusion between pixels while maintaining chromaticity control through the external driver circuit that manages current density to each micro LED.
Solution Approach 2:
The patent implements a multi-layer structure where the driver circuit is nested in a functional layer beneath the light-emitting region, with insulating films and openings creating a hierarchical arrangement. This nested configuration allows electrical connection while preventing harmful interactions between layers.
2Measurement precision
If pixel circuits are included in each pixel, then current density management is improved, but area occupation increases
Solution Approach 1:
The pixel circuit is extracted from the pixel area and relocated to a separate functional layer. The driver circuit occupies space below the light-emitting region rather than within the pixel footprint, thereby reducing the area occupied by each pixel while maintaining current density management capabilities.
Solution Approach 2:
The patent moves the driver circuit from the horizontal plane (within pixel area) to a vertical dimension (separate functional layer below). This dimensional transition allows current density management without increasing the lateral footprint of each pixel, enabling higher pixel density.
3Reliability
If insulating films with openings are used to connect driver circuit to light-emitting region, then electrical connection is achieved, but impurity diffusion is inhibited
Solution Approach 1:
The insulating film with openings acts as an intermediary between the driver circuit and light-emitting region. It provides electrical connection pathways through the openings while the insulating material itself blocks impurity diffusion, serving dual functions of connection and protection.
Solution Approach 2:
The insulating film structure features localized openings only where electrical connection is needed, while maintaining insulating properties in all other areas. This local differentiation allows electrical connectivity at specific points while preventing impurity diffusion across the entire interface.
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 provides a compact, reliable, and efficient display device with improved chromaticity management, reduced operational malfunctions, and increased pixel area, enabling high-definition image display with reduced screen-door effect.
Implementation Method 1
The light-emitting region includes a first element. The first element includes a first electrode, a second electrode, and a layer containing a light-emitting material
Implementation Method 2
a layer containing a light-emitting material includes a region positioned between the first electrode and the second electrode, and contains gallium nitride
Data Source
AI summary
A novel functional panel that is highly convenient or reliable is provided. The functional panel includes a light-emitting region including a first element, a first functional layer, and a second functional layer. The first element includes a first electrode, a second electrode, and a layer containing a light-emitting material. The layer containing a light-emitting material contains gallium nitride. The first functional layer includes a region positioned between the light-emitting region and the second functional layer, and includes a first insulating film. The first insulating film includes a first opening and a second opening on the outside of the light-emitting region. The second functional layer includes a driver circuit. The driver circuit includes a first transistor and a second transistor. The first transistor is electrically connected to the first electrode through the first opening, and the second transistor is electrically connected to the second electrode through the second opening.