OLED Border Width Reduction via Touch Sensing Wire Integration
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Solution Overview
Problem
Conventional organic light-emitting display devices have a wide border due to the limitations of glass frit sealing, which restricts the reduction of border width when a touch panel is integrated, as wiring must bypass the glass frit area, preventing complete curing and limiting the miniaturization of the display.
Innovation Solution
The organic light-emitting display device design includes a touch sensing device with sensing wires disposed overlapping the sealing adhesive layer, reducing the spacing between the touch sensing electrode array and the sealing adhesive layer, allowing for a narrower border width without compromising touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass frit sealing is used to encapsulate the organic light-emitting diode, then the anti-moisture properties are improved, but the border width increases due to wiring needing to bypass the glass frit area
Solution Approach 1:
The sensing wires of the touch panel are merged with the sealing adhesive layer, allowing the sensing wires to be disposed overlapping the sealing adhesive layer. This integration eliminates the need for separate wiring paths around the glass frit, reducing the border width while maintaining both sealing and touch sensing functions.
Solution Approach 2:
The sensing wires serve dual functions: as signal transmission lines for the touch panel and as reflective layers for curing the sealing adhesive layer. This multi-functionality allows the same structure to provide both electrical connectivity and optical reflection for adhesive curing, eliminating the need for additional metal layers and reducing overall border width.
2Manufacturing precision
If wiring bypasses the glass frit area to avoid blocking laser light, then the curing completeness is improved, but the border width cannot be further reduced
Solution Approach 1:
The sensing wires, which were originally potential obstacles to laser light curing, are converted into beneficial reflective layers that enhance the curing of the sealing adhesive layer. By positioning the sensing wires to overlap with the sealing adhesive layer, they reflect laser light back onto the adhesive, ensuring complete curing while allowing the wiring to pass through the border region.
3Length of stationary object
If the spacing between touch sensing electrode array and sealing adhesive layer is reduced, then the border width is reduced, but touch sensitivity may be compromised
Solution Approach 1:
The sensing wires act as an intermediary element between the touch sensing electrode array and the sealing adhesive layer. By disposing the sensing wires overlapping the sealing adhesive layer, they maintain electrical connectivity for touch sensing while the reduced spacing optimizes the capacitive coupling for touch detection, thereby maintaining or enhancing touch sensitivity despite the narrower border.
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 border width of the organic light-emitting display device while maintaining or enhancing touch sensitivity by allowing the sensing wires to serve as both signal transmission lines and reflective layers for curing the sealing adhesive, eliminating the need for additional metal layers and optimizing the curing process.
Implementation Method 1
the sensing wires are disposed overlapping the sealing adhesive layer... allowing the sensing wires to serve as both signal transmission lines and reflective layers for curing the sealing adhesive
Implementation Method 2
the organic light-emitting device is disposed on the second substrate in the display region
Data Source
AI summary
An organic light-emitting display device includes a first substrate, a second substrate, a sealing adhesive layer, an organic light-emitting device and a touch sensing device. The first substrate and the second substrate are disposed opposite to each other. The sealing adhesive layer is disposed between the first substrate and the second substrate in a peripheral region. The organic light-emitting device is disposed on the second substrate in a display region, and the sealing adhesive layer surrounds the organic light-emitting device. The touch sensing device is disposed on the first substrate and includes a touch sensing electrode array and a plurality of sensing wires electrically connected to the touch sensing electrode array, respectively, and the sensing wires are disposed along the peripheral region at at least one side of the display region and over the sealing adhesive layer.