Touch Display Device Using Shared Anode and Touch Electrode Material
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Solution Overview
Problem
Touch display devices with separate touch panels increase thickness, reduce light transmittance, and elevate manufacturing costs due to additional touch electrodes and lines, complicating the manufacturing process.
Innovation Solution
The touch electrode is formed using the same material as the anode electrode of the light emitting element, with an anti-deposition film preventing cathode electrode deposition and an undercut structure between the touch and anode electrodes for effective touch sensing, simplifying the manufacturing process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate touch panel is stacked on the display device, then touch sensing function is achieved, but the thickness of the display device increases
Solution Approach 1:
The patent merges the touch electrode formation process with the anode electrode formation process by forming both electrodes simultaneously from the same material layer. This integration eliminates the need for a separate touch panel stacking, thereby achieving touch sensing functionality while maintaining reduced thickness.
Solution Approach 2:
The same electrode material layer serves dual functions: forming both the anode electrode for light emission and the touch electrode for touch sensing. This multi-functional approach eliminates the need for separate dedicated touch panel components, reducing overall device thickness.
2Reliability
If additional touch electrodes and touch lines are added for sensing touch, then touch sensing capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines the formation of touch electrodes and anode electrodes into a single manufacturing step using the same material deposition process. This merging of processes reduces the number of manufacturing steps, material costs, and production complexity, thereby lowering overall manufacturing costs while maintaining touch sensing capability.
Solution Approach 2:
The same material layer is used to create both functional electrodes, eliminating the need for separate touch electrode materials and reducing material costs. The unified approach simplifies the manufacturing bill of materials and reduces production expenses.
3Reliability
If additional touch electrodes and touch lines are added, then touch sensing function is achieved, but the manufacturing process becomes complicated
Solution Approach 1:
The patent merges multiple electrode formation operations into a single integrated process step. By forming both the anode and touch electrodes simultaneously from the same material layer, the manufacturing process complexity is significantly reduced compared to separate formation processes.
Solution Approach 2:
The patent uses the same material and formation process for both anode and touch electrodes, creating homogeneous manufacturing conditions. This approach simplifies process control, reduces variability, and eliminates the need for managing multiple different electrode formation processes.
4Ease of manufacture
If the touch electrode is formed with the same material as the anode electrode, then manufacturing cost is reduced, but cathode electrode deposition on the touch electrode occurs
Solution Approach 1:
The patent applies an anti-deposition film to the touch electrode before cathode electrode deposition. This preliminary protective action prevents cathode material from adhering to the touch electrode, eliminating the harmful deposition effect while maintaining the cost benefits of using the same material for both electrodes.
Solution Approach 2:
The anti-deposition film acts as an intermediary layer between the touch electrode and the cathode electrode. This intermediate barrier prevents direct contact and material transfer, stopping cathode deposition on the touch electrode while allowing the underlying electrode structure to remain intact.
Data Source
AI summary
A display panel including a substrate; a driving transistor on the substrate; a first passivation layer covering the driving transistor; a touch line formed on the first passivation layer; a second passivation layer covering the touch line; an anode electrode formed on the second passivation layer and electrically connected to the driving transistor through a contact hole in the first passivation layer and the second passivation layer; a touch electrode formed on the second passivation layer at a position spaced apart from the anode electrode and electrically connected to the touch line through a touch contact hole of the second passivation layer; a bank covering the anode electrode and the touch electrode and having an opening corresponding to an emission area; and a light emitting layer and a cathode electrode sequentially formed on the anode electrode in the emission area.