Common Electrode Opening for Display Panel Bubble Prevention
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Solution Overview
Problem
Bubbles form in the liquid crystal layer of display panels due to gas and water vapor accumulation from the decomposition of the color filter layer during high-temperature annealing of the common electrode layer, leading to abnormal display effects.
Innovation Solution
The common electrode layer is formed with an opening opposite to the color filter layer, allowing immediate release of gases and water vapor, preventing their accumulation and reducing bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature annealing is performed on the common electrode layer, then the electrode layer is properly formed, but gas and water vapor accumulate causing bubbles in the liquid crystal layer
Solution Approach 1:
The common electrode layer is segmented by creating openings (through-holes) in specific regions. This segmentation allows the electrode layer to maintain its continuous structure for electrical function while creating localized release paths for gas and water vapor, preventing bubble formation in the liquid crystal layer.
Solution Approach 2:
The harmful gas and water vapor are extracted from the sealed space between the color filter layer and common electrode layer by providing release paths through the openings in the common electrode layer. This extraction prevents the accumulation of harmful substances that would otherwise form bubbles.
2Reliability
If the common electrode layer is made continuous, then electrical conductivity is maintained, but gas and water vapor cannot escape causing display defects
Solution Approach 1:
The common electrode layer exhibits different local properties: in most regions it remains continuous for electrical conductivity, while in specific localized regions (where openings are formed) it provides gas release paths. This local differentiation resolves the contradiction between maintaining conductivity and allowing vapor escape.
3Object-generated harmful factors
If openings are added to the common electrode layer, then gas release is enabled, but the structural integrity may be compromised
Solution Approach 1:
Instead of creating numerous small openings or a fully perforated layer, the invention uses a limited number of strategically positioned openings. This partial action provides sufficient gas release capability while maintaining the overall structural integrity and visual appearance of the common electrode layer.
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 solution effectively reduces bubble formation in the liquid crystal layer, improving the display panel's performance and maintaining the electric field integrity, thus enhancing the display effect.
Implementation Method 1
the gas and water vapor produced by the color filter layer may pass through the opening
Implementation Method 2
the gas and water vapor produced by the color filter layer may pass through the opening and be released immediately
Implementation Method 3
the gas and water vapor produced by the color filter layer may pass through the opening and be released immediately
Data Source
AI summary
A display panel, a manufacturing method of the display panel, and a display device are disclosed. The display panel includes a first substrate and a second substrate. The first substrate includes a first base, a light-shielding layer disposed on the first base, and a color filter layer disposed on the first base, and a common electrode layer disposed on the light-shielding layer and the color filter layer. The common electrode layer is provided with an opening at a position opposite to the color filter layer.