Display Electrode Recess Structure for Higher LED Pixel Density
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Solution Overview
Problem
Current display devices face limitations in increasing the number of light emitting elements per unit area, which affects luminance and efficiency.
Innovation Solution
The display device incorporates a unique electrode structure with recesses and protrusions on electrodes, allowing for additional light emitting elements to be arranged between them, thereby increasing the density of light emitting elements per unit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional flat electrode structures are used, then the device structure is simple and easy to manufacture, but the number of light emitting elements per unit area is limited
Solution Approach 1:
The patent transitions from a two-dimensional flat electrode surface to a three-dimensional structure by forming recesses and protrusions on the electrode surfaces. This dimensional change creates additional spatial layers that allow light emitting elements to be arranged not only on the surface but also within the recesses, thereby increasing the density of light emitting elements per unit area without simply expanding the footprint.
Solution Approach 2:
The patent implements nesting by placing light emitting elements both on the outer surface of the electrode and within the recesses formed on the electrode surface. The protrusions from one electrode fit into the recesses of the opposing electrode, creating a nested arrangement where multiple light emitting elements are positioned at different depth levels, effectively multiplying the capacity for light emitting elements within the same planar footprint.
2Illumination intensity
If more light emitting elements are arranged per unit area, then luminance per unit area increases, but the available space for each element decreases
Solution Approach 1:
By utilizing the third dimension through recesses and protrusions, the patent effectively increases the total volume available for light emitting elements without increasing the planar area. This allows more elements to be packed into the same footprint by distributing them across multiple vertical levels, thus maintaining adequate space for each element while increasing overall density.
Solution Approach 2:
The electrode surface is segmented into multiple regions including flat areas and recessed areas, each capable of hosting light emitting elements. This segmentation divides the limited planar space into multiple functional zones, allowing light emitting elements to be distributed across these segmented regions, thereby increasing the total number of elements that can be accommodated per unit area.
3Quantity of substance
If recesses and protrusions are added to electrodes, then the number of light emitting elements increases, but the manufacturing process becomes more complex
Solution Approach 1:
The manufacturing process is segmented into distinct steps: forming recesses on one electrode, forming protrusions on the opposing electrode, and then assembling them. This segmentation of the fabrication process allows each step to be optimized independently, making the overall complex structure achievable through standardized, repeatable manufacturing operations rather than requiring a single complex monolithic process.
Data Source
AI summary
A display device includes: a first electrode extending in a first direction, a second electrode extending in the first direction and spaced apart from the first electrode in a second direction intersecting the first direction, and a plurality of light emitting elements disposed on the first electrode and the second electrode. The first electrode includes a recess formed by partially recessing a side of the first electrode facing the second electrode, the second electrode comprises a protrusion disposed on a side of the second electrode facing the first electrode and inserted into the recess, and the plurality of light emitting elements include a first light emitting element disposed on portions of the first electrode and the second electrode extending in the first direction, and a second light emitting element disposed on the recess of the first electrode and disposed on the protrusion of the second electrode.