In-Cell Touch Panel Planarization Layer Design
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Solution Overview
Problem
In-cell touch panels face issues with uneven peripheral surfaces due to fan-out lines, leading to assembly problems and moisture-related defects from organic overcoat layers, which affect reliability and manufacturing costs.
Innovation Solution
A touch panel design incorporating a planarization layer made of color-resist material with a dielectric coefficient ranging from 3 to 5, providing water resistance, gas resistance, and insulation, covering sensing lines in the peripheral region to address surface unevenness and moisture absorption issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If an overcoat layer made of organic material is formed to smooth the peripheral surface, then the surface evenness is improved, but moisture absorption increases leading to reliability deterioration
Solution Approach 1:
The patent changes the material parameter of the planarization layer from organic material to inorganic material (such as silicon nitride or silicon oxide), which fundamentally alters the moisture absorption characteristic while maintaining the surface smoothing function
Solution Approach 2:
The patent employs a composite structure where the planarization layer is formed by stacking multiple inorganic material layers with different dielectric coefficients, creating a material composite that provides both surface evenness and moisture resistance
2Ease of manufacture
If fan-out lines are extended from sensing region to peripheral region, then electrical connection is improved, but surface unevenness increases causing assembly problems
Solution Approach 1:
The patent performs preliminary planarization by forming the inorganic planarization layer before assembling other components, thereby preparing an even surface in advance that prevents subsequent assembly problems
Solution Approach 2:
The inorganic planarization layer acts as an intermediary between the uneven fan-out lines and the subsequent assembly processes, absorbing the surface irregularities while maintaining electrical connectivity
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 reliability and longevity of touch panels and display panels by preventing moisture absorption, ensuring even surfaces for assembly and reducing manufacturing costs through simplified production processes.
Implementation Method 1
the planarization layer includes a color-resist material that has a dielectric coefficient ranging from about 3 to about 5
Implementation Method 2
the planarization layer may be characterized by water resistance, gas resistance, and insulation
Implementation Method 3
the planarization layer may be characterized by water resistance, gas resistance, and insulation
Data Source
AI summary
A touch panel includes a substrate, a touch device layer, a sensing circuit structure, and a planarization layer. The substrate includes a sensing region and a peripheral region that surrounds the sensing region. The touch device layer is disposed on the sensing region of the substrate. The sensing circuit structure is disposed on the peripheral region of the substrate, and the sensing circuit structure includes a plurality of sensing lines. The sensing lines are electrically connected to the touch device layer. The planarization layer is located on the substrate. Here, the planarization layer includes a color-resist material that has a dielectric coefficient ranging from about 3 to about 5, and the planarization layer covers the sensing lines located in the peripheral region.