Top-Emission Display Panel IR Drop Reduction via Dual Emission
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Solution Overview
Problem
Large-sized top-emission display devices experience IR drop issues around the center of the display area, leading to display inconsistencies, and the manufacturing process is complex.
Innovation Solution
A display panel structure comprising a substrate with an active component, passivation layer, planar layer, first electrode, pixel defining layer, insulating layer, conductive layer, electroluminescence layer, and second electrode, where the electroluminescence layer is between the first and second electrodes, and the conductive layer covers the pixel defining layer, increasing the light-emitting area and addressing IR drop problems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large sized top-emission display device is designed to emit light, then the display area is increased, but IR drop problems occur around the center of the display area causing display inconformity
Solution Approach 1:
The patent transitions from a conventional top-emission structure to a dual-emission structure by adding a bottom-emission layer. This dimensional change allows light to be emitted from both the top and bottom of the display panel, effectively doubling the light-emitting area and reducing the current density in the center region, thereby eliminating IR drop problems while maintaining large display area.
Solution Approach 2:
The display panel is segmented into two independent emission systems: a top-emission layer and a bottom-emission layer. Each layer can be independently controlled and optimized. This segmentation allows the current to be distributed through multiple pathways, reducing the current concentration in the center region and preventing IR drop while maintaining large display area.
2Ease of manufacture
If a conventional top-emission display structure is used, then the manufacturing process is simplified, but the light-emitting area is limited and IR drop problems occur
Solution Approach 1:
The patent merges two emission structures (top-emission and bottom-emission) into a single integrated display panel. The manufacturing process combines the fabrication of both emission layers, electrodes, and functional materials in a unified structure, achieving increased light-emitting area while maintaining manufacturing efficiency through process integration.
Solution Approach 2:
The display panel is designed with multi-functionality, serving both as a top-emission and bottom-emission device simultaneously. The same substrate and active components support dual emission functions, allowing the device to achieve larger effective display area without requiring separate manufacturing lines or complex additional processing steps.
3Area of stationary object
If the electroluminescence layer thickness is increased to improve light emission, then the light-emitting area is enhanced, but the manufacturing complexity increases
Solution Approach 1:
Instead of increasing the thickness of a single electroluminescence layer, the patent adds a second emission layer in the vertical dimension (bottom-emission layer). This approach increases the effective light-emitting area by utilizing both top and bottom surfaces, while maintaining manageable thickness for each individual layer, thus avoiding excessive manufacturing 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 solution enhances the light-emitting area of top-emission display devices, effectively solving IR drop issues and simplifying the manufacturing process by optimizing the layer thickness and structure.
Implementation Method 1
an electroluminescence layer electrically connected to the first electrode, and a second electrode electrically connected the electroluminescence layer
Data Source
AI summary
A display panel is provided. The display panel includes a substrate, an active component disposed on the substrate, a passivation layer covering the active component, a planar layer covering the passivation layer, a first electrode disposed on the planar layer, a pixel defining layer covering the first electrode and the planar layer, an insulating layer disposed on the pixel defining layer, a conductive layer disposed on the insulating layer, an electroluminescence layer, and a second electrode. The first electrode is electrically connected to the active component by extending through an opening disposed in the passivation layer and the planar layer. The insulating layer covers a part of the pixel defining layer. The electroluminescence layer is disposed between the first electrode and the second electrode. A thickness of the electroluminescence layer is larger than or equal to a thickness of the insulating layer.