Integrated OLED Touch Sensor Layout Without Adhesive Lamination
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Solution Overview
Problem
The existing manufacturing process for organic light emitting displays with touchscreens is complicated and costly due to the separate production and attachment of a touchscreen to the display panel, which involves additional adhesion processes.
Innovation Solution
The touchscreen is directly integrated onto the encapsulation part of the organic light emitting display, with the display cover electrode and touch sensor conductive layers sharing the same material, eliminating the need for additional adhesion and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touchscreen is separately produced and attached to the display panel through adhesive agent, then the touchsensor can be independently manufactured and tested, but the overall manufacturing process becomes complicated and costs increase due to additional attachment processes
Solution Approach 1:
The patent merges the touchscreen and display panel into a single integrated structure where the touch sensor is formed directly on the display panel substrate. The touch sensor electrode, insulating layer, and display electrode are deposited and patterned in the same manufacturing sequence, eliminating the need for separate touchscreen production and adhesive attachment processes.
2Manufacturing precision
If the touchscreen is separately produced and attached to the display panel, then quality control can be performed on separate components, but manufacturing costs increase due to additional attachment processes
Solution Approach 1:
The patent combines multiple manufacturing operations into a single integrated process flow. The touch sensor and display electrode are formed simultaneously using the same deposition and patterning equipment, reducing the number of process steps, equipment requirements, and associated costs while maintaining quality control through in-line process monitoring.
Solution Approach 2:
The patent employs universal manufacturing processes that serve multiple functions. The same thin film deposition and patterning techniques used for display electrode fabrication are also used for touch sensor electrode creation, allowing a single manufacturing line to produce both functional components without requiring specialized equipment or processes.
3Reliability
If the display cover electrode is made of different material than the touch sensor conductive layer, then each component can be optimized for its specific function, but the manufacturing process becomes more complex and the display pad electrode may be damaged
Solution Approach 1:
The patent uses the same conductive material for both the touch sensor electrode and display electrode, creating a homogeneous structure. This single material layer is patterned to form both functional electrodes, eliminating the need for multiple material depositions and reducing the risk of damage to the display pad electrode that would occur with separate material layers and processing steps.
Data Source
AI summary
Disclosed is an organic light emitting display device with a touch sensor. The display device has a touch sensor that is directly disposed on a sealing part, thus removing the necessity of an additional adhesion process, simplifying a manufacturing process and reducing manufacture cost. In addition, the display device with the touch sensor includes a display cover electrode of a display pad that is made of a same material as a conductive layer included in the touch sensor, thus preventing damage to the display pad electrode.