Nitrogen-Free Barrier Layer for Display Touch Sensor
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Solution Overview
Problem
The deterioration of polarizing plates in display devices due to water penetration and chemical reactions with nitrogen-containing materials, leading to the formation of NH3+ ions that damage the iodine complex, is a significant issue affecting the quality and longevity of these devices.
Innovation Solution
A display device configuration that includes a sealing film covering the display region, a touch sensor layer with a nitrogen-containing first insulating layer and a nitrogen-free second insulating layer positioned between the first insulating layer and the overcoat, preventing direct contact and reaction between nitrogen and water, thereby inhibiting the formation of NH3+ ions and protecting the polarizing plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nitrogen-containing insulating layer is used in the touch sensor layer, then the electrical insulation performance is improved, but water penetration and chemical reaction with nitrogen cause NH3+ ion formation that damages the polarizing plate
Solution Approach 1:
A nitrogen-free insulating layer is introduced as an intermediary barrier between the nitrogen-containing insulating layer and the overcoat containing water. This intermediate layer prevents direct contact between nitrogen and water, blocking the chemical reaction that produces NH3+ ions, while maintaining the electrical insulation function of the touch sensor layer.
Solution Approach 2:
The insulating layer structure is segmented into multiple layers with different chemical compositions. The nitrogen-containing layer provides electrical insulation for the touch sensor, while the adjacent nitrogen-free layer provides chemical barrier functionality. This segmentation allows each layer to specialize in one function without compromising the other.
2Volume of moving object
If the display device is made thinner to improve portability, then the device size is reduced, but impurity penetration such as water becomes more severe
Solution Approach 1:
The sealing structure uses a composite multilayer film comprising alternating inorganic and organic insulating layers. This composite structure provides superior water barrier properties compared to single-material films, enabling effective impurity prevention in thin display devices. The inorganic layers provide chemical stability and barrier function, while organic layers provide flexibility and adhesion.
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 reduces the formation of NH3+ ions, thereby preventing the deterioration of the polarizing plate and maintaining the display device's quality and visibility, as demonstrated by reduced ion detection levels in experimental results.
Implementation Method 1
a second insulating layer configured to inhibit a reaction between nitrogen included in the first insulating layer and water included in the overcoat
Implementation Method 2
a sealing film covering a display region where an image is configured to be displayed
Data Source
AI summary
A display device includes a sealing film covering a display region where an image is displayed, a touch sensor layer configured to detect a touched position of the display region, the touch sensor layer including a first electrode layer that is arranged on the sealing film, a first insulating layer that is formed on the first electrode layer using a material including nitrogen, and a second electrode layer that is arranged over the first insulating layer, an overcoat covering the touch sensor layer, and a polarizing plate being arranged on the overcoat. The touch sensor layer further includes a second insulating layer configured to inhibit a reaction between nitrogen included in the first insulating layer and water included in the overcoat, the second insulating layer being formed between the first insulating layer and the overcoat using a material not including nitrogen.