OLED Display Panel Conductive Shielding Layer Groove
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Solution Overview
Problem
Existing OLED display panels face challenges in achieving high pixel density due to limitations in fine mask manufacturing processes, leading to leakage issues between light-emitting units, which result in cross-color and reduced color gamut.
Innovation Solution
The display panel incorporates a driving backplane with a planarization layer, a conductive shielding layer disposed in a groove, and a light-emitting layer recessed at a separation groove, ensuring that carriers are absorbed by the shielding layer to prevent leakage between light-emitting units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fine mask manufacturing process is used to increase pixel density, then manufacturing precision is improved, but leakage between light-emitting units occurs causing cross-color
Solution Approach 1:
The patent introduces a separation groove that divides the planarization layer into distinct regions, physically segmenting the light-emitting units. This segmentation prevents carrier leakage between adjacent pixels while maintaining high pixel density, directly resolving the contradiction between fine mask manufacturing precision and leakage prevention.
Solution Approach 2:
The conductive shielding layer acts as an intermediary element positioned at the separation groove. It absorbs and blocks carriers that might otherwise leak between light-emitting units, serving as a mediator that prevents cross-color while allowing the fine mask process to achieve high pixel density.
2Device complexity
If conventional OLED structure is used, then manufacturing process is simple, but color gamut is reduced due to cross-color
Solution Approach 1:
By segmenting the planarization layer with a separation groove, the patent prevents cross-color between adjacent pixels. This segmentation approach maintains manufacturing simplicity while eliminating the harmful cross-color effect, thereby preserving color gamut without significantly increasing device complexity.
Solution Approach 2:
The conductive shielding layer serves as an intermediary that blocks carrier leakage paths. This addition prevents cross-color and maintains color gamut while keeping the manufacturing process relatively simple, as the shielding layer can be integrated into existing OLED fabrication steps.
3Ease of manufacture
If light-emitting layer is continuous, then manufacturing is easier, but carrier leakage occurs between adjacent pixels
Solution Approach 1:
The separation groove segments the continuous light-emitting layer into discrete regions over each pixel. This segmentation prevents carrier leakage between pixels while maintaining ease of manufacture, as the groove can be formed through standard planarization processes before light-emitting layer deposition.
Solution Approach 2:
The conductive shielding layer at the separation groove acts as an intermediary barrier that blocks carrier leakage. This maintains luminescence purity and reliability while allowing the light-emitting layer to be formed as a continuous film, preserving manufacturing ease.
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
This configuration effectively prevents leakage between light-emitting units, enhancing the color gamut and improving the display panel's ability to maintain luminescence purity, with a measured color gamut index reaching 80%.
Implementation Method 1
carriers are absorbed by the shielding layer to prevent leakage between light-emitting units
Data Source
AI summary
The present disclosure relates to a display device, including: a driving backplane, including a substrate, at least one wiring layer and a planarization layer, wherein the planarization layer is provided with a groove; a first electrode layer, disposed on a surface of the planarization layer away from the substrate, and including a plurality of first electrodes distributed at intervals; a pixel definition layer, disposed on the surface of the planarization layer away from the substrate, wherein a separation groove is formed by the pixel definition layer at the groove; a conductive shielding layer, at least partially disposed in the groove; a light-emitting layer, by which the pixel definition layer, the first electrodes and the conductive shielding layer are covered, wherein the light-emitting layer is recessed at the separation groove and is in direct contact with at least a partial area of the conductive shielding layer.