OLED Pixel Circuit Stacking for Higher Density Without Shrink Limits
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Solution Overview
Problem
Existing display technologies face challenges in achieving high pixel density due to limitations in reducing the size of pixel circuits while maintaining electrical performance.
Innovation Solution
The display substrate design includes an array of pixel circuits with first and second pixel circuits arranged in overlapping patterns, allowing for increased density without significant size reduction by optimizing the layout and connectivity of conductive structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of pixel circuit is reduced to increase pixel density, then pixel density is improved, but electrical performance of transistor and capacitor deteriorates
Solution Approach 1:
The patent transitions from two-dimensional planar arrangement to three-dimensional stacked arrangement by placing first and second pixel circuits at different heights on the substrate. This vertical stacking enables increased pixel density without reducing the horizontal footprint of individual pixel circuits, thereby maintaining electrical performance while achieving higher pixel density.
Solution Approach 2:
The patent implements nesting by positioning the orthographic projection of the second pixel circuit to partially overlap with the orthographic projection of the first pixel circuit. This allows the second pixel circuit to be effectively 'nested' within the spatial envelope of the first pixel circuit's projection, maximizing space utilization and increasing pixel density without compromising the electrical performance of either circuit.
2Quantity of substance
If the size of pixel circuit is reduced to increase pixel density, then pixel density is improved, but pixel circuit size can only be reduced to a certain extent
Solution Approach 1:
The patent resolves the size limitation by adding the vertical dimension to the pixel circuit arrangement. Instead of continuing to reduce already-minimal horizontal dimensions, the patent stacks pixel circuits vertically, effectively removing the constraint on further size reduction and enabling continuous increase in pixel density.
Solution Approach 2:
The patent segments the pixel circuit system into multiple independent layers (first pixel circuit and second pixel circuit at different heights). This segmentation allows each layer to be optimized independently and enables the system to achieve higher density by combining multiple segments in the vertical dimension rather than compressing a single layer.
Data Source
AI summary
A display substrate includes a plurality of pixel circuits arranged in an array and a plurality of light emitting devices provided on a substrate, and at least one pixel circuit is connected to a corresponding light emitting device through a conductive structure. At least some of the pixel circuits in at least one column include a first pixel circuit and a second pixel circuit arranged on a side of the first pixel circuit away from the substrate, orthographic projections of the second pixel circuit and the first pixel circuit on the substrate partially overlap to form an overlapping portion defining a first pattern, and an orthographic projection of a conductive structure of the first pixel circuit on the substrate, the first pattern, and an orthographic projection of a conductive structure of the second pixel circuit on the substrate are sequentially arranged in a first direction.