Stacked Light-Emitting Substrate Layout for Higher Display Resolution
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Solution Overview
Problem
The existing light-emitting substrates face issues with large spacing between light-emitting devices of different colors, leading to low resolution in display apparatus due to position errors during mass transfer, resulting in overlapping and light-emitting failures.
Innovation Solution
A light-emitting substrate with multiple light-emitting layers, each comprising devices of different colors, where the layers are stacked and connected to a driving circuit layer with specific conductive and reflective structures to optimize spacing and reduce overlapping, improving resolution and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light-emitting devices of different colors are arranged in a single layer with mass transfer, then manufacturing is simplified, but position errors cause overlapping and light-emitting failures reducing reliability
Solution Approach 1:
The patent divides the light-emitting devices into multiple layers (first light-emitting layer, second light-emitting layer, third light-emitting layer) with different colors arranged in different layers. This segmentation allows each layer to be positioned independently, eliminating the overlapping issues that occur with single-layer mass transfer while maintaining manufacturing feasibility through layer-by-layer assembly.
Solution Approach 2:
The patent transitions from a two-dimensional single-layer arrangement to a three-dimensional multi-layer structure. By stacking light-emitting devices of different colors in vertical layers rather than arranging them horizontally in a single plane, the patent eliminates position errors causing overlapping while maintaining the benefits of mass transfer manufacturing.
2Reliability
If light-emitting devices are arranged with larger spacing to avoid overlapping, then light-emitting failures are reduced, but display resolution decreases
Solution Approach 1:
By arranging light-emitting devices in multiple vertical layers rather than spreading them out in a single horizontal plane, the patent maintains small spacing between devices in the horizontal direction (preserving resolution) while using the vertical dimension to separate different color devices and prevent overlapping.
Solution Approach 2:
The patent applies different spatial arrangements to different color devices by placing them in specific layers. Each layer contains light-emitting devices of a specific color, allowing precise local positioning without requiring large overall spacing, thus maintaining high resolution while preventing overlapping.
3Manufacturing precision
If multiple light-emitting layers are stacked, then resolution is improved by reducing spacing, but device complexity increases
Solution Approach 1:
The patent segments the light-emitting devices into distinct layers based on color, with each layer containing devices of a specific color. This segmentation simplifies the overall structure by organizing complexity into manageable, color-specific modules rather than creating a complex mixed arrangement.
Solution Approach 2:
Each light-emitting layer serves multiple functions: it provides a specific color output, acts as a positioning platform for that color's devices, and enables independent optimization of spacing and connection structures for that color, thereby managing complexity through functional specialization.
Data Source
AI summary
A light-emitting substrate includes a driving circuit layer, a first light-emitting layer located on a side of the driving circuit layer, a second light-emitting layer located on a side of the first light-emitting layer away from the driving circuit layer, and a third light-emitting layer located on a side of the second light-emitting layer away from the driving circuit layer. The pixel circuit layer includes pixel circuits. The first light-emitting layer includes first light-emitting devices respectively coupled to the pixel circuits. The second light-emitting layer includes second light-emitting devices respectively coupled to the pixel circuits. The third light-emitting layer includes third light-emitting devices respectively coupled to the pixel circuits. Orthographic projections of a first light-emitting device, a second light-emitting device and a third light-emitting device on the driving circuit layer do not necessarily coincide with each other.