Stacked Pixel Circuit Layers for High-Resolution Display
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Solution Overview
Problem
The challenge in manufacturing high-resolution light emitting display panels is the difficulty in integrating a pixel driving circuit, including an internal compensation circuit, due to the reduced size of each pixel, which affects uniform image quality and current variation across pixels.
Innovation Solution
A light emitting display panel design featuring a double-layer pixel circuit structure, where each pixel includes a first pixel circuit layer with a first capacitor and a second pixel circuit layer with a second capacitor, both electrically connected to a driving transistor, allowing for internal compensation of threshold voltage variations without requiring additional area for capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the light emitting display panel is increased, then the image quality is improved, but the size of each pixel is reduced making it difficult to form a pixel driving circuit with internal compensation circuit
Solution Approach 1:
The patent applies dimensionality change by transitioning from a single-plane pixel circuit layout to a three-dimensional stacked architecture. The first pixel circuit layer and second pixel circuit layer are formed on different substrates that are bonded together, allowing the pixel driving circuit components to be distributed across multiple spatial dimensions. This vertical stacking enables high-resolution display with adequate circuit space without increasing the horizontal pixel area.
Solution Approach 2:
The pixel driving circuit is segmented into two separate layers: the first pixel circuit layer containing certain circuit components on a first substrate, and the second pixel circuit layer containing remaining components including the driving transistor on a second substrate. This segmentation allows each layer to be optimized independently for its specific function while maintaining compact overall pixel area suitable for high-resolution displays.
2Measurement precision
If the pixel size is reduced for high resolution, then the resolution is improved, but the area available for capacitors in the pixel driving circuit is insufficient
Solution Approach 1:
Capacitors are distributed across both the first pixel circuit layer and the second pixel circuit layer in the vertical dimension. First capacitors are formed on the first substrate while second capacitors are formed on the second substrate, effectively utilizing the third dimension (vertical space) to accommodate capacitor structures without increasing the horizontal pixel footprint.
Solution Approach 2:
The capacitor structures are nested within the multi-layer pixel circuit architecture. Capacitors in the first layer are positioned to overlap or align with circuit elements in the second layer, creating a compact nested arrangement that maximizes space utilization within the constrained pixel area while providing sufficient capacitor area for threshold voltage compensation.
Data Source
AI summary
A light emitting display panel having a high resolution is provided. The light emitting display panel includes a plurality of pixels. Each of the plurality of pixels includes a first pixel circuit layer, a second pixel circuit layer, and a light emitting device layer. The first pixel circuit layer includes a first pixel circuit that includes a first layer electrode. The second pixel circuit layer includes a second pixel circuit that includes a second layer electrode which configures a first capacitor along with the first layer electrode. The light emitting device layer includes a light emitting device electrically connected to a driving transistor provided in the second pixel circuit layer.