Touch Sensor Lead-out Wiring Disconnection Prevention
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Solution Overview
Problem
The existing display devices with capacitive touch sensors face disconnection issues with lead-out wiring due to the step formed by the outer edge of the sealing film, which can lead to disconnection or short circuits.
Innovation Solution
Incorporating an interlayer insulating film that fills the step formed by the outer edge of the sealing film and the base insulating film, allowing the lead-out wiring to pass over this filled area, thereby preventing disconnection and improving the reliability and yield of the touch sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lead-out wiring passes over the outer edge of the sealing film, then the wiring can be drawn out to the peripheral area, but the step formed by the outer edge of the sealing film causes disconnection of the lead-out wiring
Solution Approach 1:
An interlayer insulating film is introduced as an intermediary element between the sealing film and the base insulating film. This interlayer insulating film fills the step formed by the outer edge of the sealing film, providing a smooth transition surface that allows the lead-out wiring to pass over without disconnection while maintaining electrical insulation properties.
Solution Approach 2:
The interlayer insulating film is formed in advance to fill the step structure before the lead-out wiring is deposited. This preliminary action creates a pre-flattened surface that prevents wiring disconnection issues before they can occur during the wiring formation process.
2Manufacturing precision
If the sealing film outer edge forms a step with the base insulating film, then the display device structure is defined, but the step causes disconnection or short circuits of the lead-out wiring
Solution Approach 1:
The interlayer insulating film serves as a mediator that reconciles the structural definition provided by the sealing film step with the wiring connection reliability. It fills the step while maintaining the overall structural integrity and providing a smooth surface for wiring deposition.
Solution Approach 2:
The interlayer insulating film is applied locally at the step region where the sealing film outer edge meets the base insulating film. This localized application provides the necessary flattening and insulation exactly where needed, without affecting other regions of the display device structure.
3Adaptability or versatility
If the lead-out wiring is drawn out to peripheral area outside display area, then external connection is enabled, but the wiring passes over the step formed by sealing film outer edge causing disconnection
Solution Approach 1:
The interlayer insulating film acts as an intermediary structure that enables the lead-out wiring to extend from the display area to the peripheral area while maintaining reliable connection. It provides a continuous, smooth surface that bridges the step formation caused by the sealing film edge.
Data Source
AI summary
A display device according to an embodiment of the invention includes: a base insulating film; a sealing film which covers the base insulating film; a plurality of first electrodes which are two-dimensionally arranged on the sealing film, the first electrodes adjacent in a first direction being connected via a first connection line; a plurality of second electrodes which are two-dimensionally arranged, the second electrodes adjacent in the second direction being connected via a second connection line intersecting the first connection line in plan view; an interlayer insulating film which is interposed between the first connection line and the second connection line and which fills a step formed by an outer edge of the sealing film and the base insulating film; and a lead-out wiring which is connected to the first electrode or the second electrode and which passes over a portion of the interlayer insulating film which fills the step.