Two-Layer Pixel Circuit for High-Resolution Display Uniformity
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Solution Overview
Problem
High-resolution light emitting display apparatuses face challenges in implementing uniform pixel quality due to threshold voltage deviations in driving transistors, making it difficult to form and arrange pixel circuits, especially as pixel size decreases with increasing resolution.
Innovation Solution
A light emitting display apparatus with a two-layered pixel circuit structure, where a first circuit layer includes a driving transistor and a light emitting diode, and a second circuit layer includes a data supply transistor, connected through a circuit insulating layer, allowing for efficient data current supply and voltage management, enabling high-resolution display despite reduced pixel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resolution is increased, then display quality is improved, but pixel size decreases making it difficult to arrange pixel circuits
Solution Approach 1:
The patent transitions from a planar single-layer circuit arrangement to a three-dimensional multi-layer circuit structure. The pixel circuit is divided into multiple layers stacked vertically, allowing circuits to be arranged in the depth dimension rather than only in the planar area, thereby enabling high-resolution displays with sufficient circuit space in each pixel.
Solution Approach 2:
The pixel circuit is segmented into multiple functional blocks distributed across different layers: the first circuit layer contains the driving transistor and light emitting diode, while the second circuit layer contains the data supply transistor. This segmentation allows each layer to be optimized independently and facilitates compact arrangement in the vertical direction.
2Measurement precision
If pixel size decreases, then high resolution is achieved, but it becomes difficult to form and arrange pixel circuits including internal compensation circuits
Solution Approach 1:
By utilizing the vertical dimension through multi-layer stacking, the patent provides sufficient space for complex pixel circuits including compensation circuits without increasing the planar pixel area. This enables high-resolution displays while maintaining manufacturability of complete pixel circuits.
Solution Approach 2:
The patent employs a nested arrangement where circuit elements are organized hierarchically across layers. The first circuit layer is positioned at a lower level with the second circuit layer stacked above it, creating a compact nested structure that fits within the reduced pixel footprint while maintaining all necessary circuit functions.
3Device complexity
If a single-layer pixel circuit is used, then structure is simple, but uniform picture quality cannot be achieved due to threshold voltage deviation
Solution Approach 1:
The pixel circuit is segmented into multiple functional blocks distributed across different layers: the first circuit layer contains the driving transistor and light emitting diode, while the second circuit layer contains the data supply transistor. This segmentation allows each layer to be optimized independently and facilitates compact arrangement in the vertical direction.
Solution Approach 2:
The patent introduces a circuit insulating layer as an intermediary between the first and second circuit layers. This insulating layer enables electrical isolation while maintaining mechanical support and structural integrity, allowing the multi-layer configuration to achieve uniform picture quality without excessive 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 two-layered structure ensures sufficient arrangement of pixel circuits in high-resolution displays, achieving uniform picture quality and high resolution by effectively managing data current and voltage, even with smaller pixel sizes.
Implementation Method 1
a light emitting diode layer including a light emitting diode electrically connected with the first pixel circuit
Data Source
AI summary
A light emitting display apparatus is disclosed. The light emitting display apparatus includes: a substrate; and a plurality of pixels disposed on a pixel area on the substrate. Each of the plurality of pixels includes: a first circuit layer including a first pixel circuit including a driving transistor; a second circuit layer overlapping the first circuit layer, wherein the second circuit layer includes a second pixel circuit including a data supply transistor configured to supply a data signal to the first pixel circuit; a circuit insulating layer between the first circuit layer and the second circuit layer; and a light emitting diode layer including a light emitting diode electrically connected with the first pixel circuit.