Display Panel Cathode Opening Structure for Higher Transmittance
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Solution Overview
Problem
Existing display technologies face challenges in improving light transmittance and preventing edge upturning of electrodes during laser etching, which affects subsequent encapsulation processes and the integration of photosensitive components.
Innovation Solution
A display panel design featuring a first blocking layer with a through hole, a first electrode layer, and a second electrode layer with a body and edge portion, where the edge portion contacts the array substrate, and a method involving laser etching through the blocking layer to form an opening in the second electrode layer, reducing its distribution area and enhancing adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If laser etching method is used to pattern the cathode, then light transmittance of the screen is improved, but cathode material peels in the etching region affecting subsequent packaging
Solution Approach 1:
The cathode is divided into two distinct parts: a body portion and an edge portion extending from the body toward the opening. This segmentation allows different regions to have different functions - the body portion maintains adhesion while the edge portion provides structural support without peeling during laser etching
Solution Approach 2:
Different portions of the cathode are given different geometric characteristics. The edge portion has a specific shape extending toward the opening that prevents peeling during laser etching, while the body portion maintains contact with the pixel definition layer for electrical function. This local differentiation resolves the contradiction between transmittance improvement and material stability
2Illumination intensity
If the second electrode layer is patterned to improve transmittance, then light transmittance increases, but edge upturning occurs during encapsulation
Solution Approach 1:
The edge portion of the second electrode is pre-formed with a specific geometry extending toward the opening before the encapsulation process. This preliminary shaping prevents edge upturning during subsequent encapsulation by providing a structural configuration that resists deformation
Solution Approach 2:
Instead of trying to prevent edge upturning after it occurs, the invention inverts the approach by pre-shaping the edge portion to have a configuration that inherently resists upturning. The edge portion extends toward the opening in a controlled manner that prevents the typical upturning behavior during encapsulation
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 design increases light transmittance and facilitates under-screen integration of photosensitive components while minimizing edge upturning issues during encapsulation, ensuring reliable encapsulation and improved display performance.
Implementation Method 1
laser-etching the second conductive material layer from a side of the array substrate away from the pixel definition layer, wherein laser light passes through the first through hole and etches the second conductive material layer to obtain an opening
Data Source
AI summary
A display panel, a display device, and a preparing method of a display panel. The display panel includes an array substrate; a first electrode layer located on a side of the array substrate, the first electrode layer includes a pixel electrode. A pixel definition layer located on a side of the first electrode layer away from the array substrate, the pixel definition layer includes an isolation portion and a pixel opening surrounded by the isolation portion. A second electrode layer located on a side of the pixel definition layer away from the array substrate, the second electrode layer includes a second electrode and an opening, the second electrode includes a body portion and an edge portion arranged as extending from the body portion and toward the opening.