Integrated Touch Sensor on OLED Encapsulation Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The manufacturing process of organic light emitting display devices with integrated touch sensors is complex and costly due to the need for additional attachment processes, such as adhesion, to integrate touchscreens with display panels.
Innovation Solution
The solution involves directly disposing touch sensing and driving electrodes, along with a color filter, on an encapsulation layer covering the light emitting device, eliminating the need for an additional adhesion process and simplifying the manufacturing process by forming these components on a single substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touchscreen is separately produced and attached to the front surface of the display panel through an adhesive agent, then the touch panel can be integrated with the display panel, but the overall manufacturing process becomes complicated and costs increase
Solution Approach 1:
The patent merges the touch panel and display panel into a single integrated structure by forming the touch sensor electrodes and color filter directly on the encapsulation layer of the display panel. This eliminates the need for separate production and attachment processes, thereby reducing manufacturing complexity while achieving integration.
Solution Approach 2:
The encapsulation layer of the display panel serves multiple functions: it protects the light emitting device and simultaneously acts as the substrate for forming the touch sensor electrodes and color filter. This multi-functionality eliminates the need for separate substrates and reduces the number of manufacturing steps.
2Adaptability or versatility
If a touchscreen is separately produced and attached to the front surface of the display panel through an adhesive agent, then the touch panel can be integrated with the display panel, but manufacturing costs increase
Solution Approach 1:
The patent combines the manufacturing of the display panel and touch panel into a single process by forming all touch sensor components directly on the display panel's encapsulation layer. This eliminates the need for separate production lines, adhesive materials, and attachment equipment, thereby reducing manufacturing costs.
Solution Approach 2:
The encapsulation layer serves as both the protective barrier for the light emitting device and the substrate for the touch sensor components. This eliminates the need for separate substrates and reduces material costs while simplifying the manufacturing process.
3Device complexity
If touch sensor electrodes and color filter are formed directly on the encapsulation layer, then the manufacturing process is simplified and costs are reduced, but the routing line must contact the side surface of the encapsulation layer
Solution Approach 1:
The routing line transitions from a planar configuration to a three-dimensional path by contacting the side surface of the encapsulation layer. This dimensional change allows the routing line to reach the touch sensor electrodes formed on the top surface while maintaining the simplified integrated structure.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed are an organic light emitting display device and a method of manufacturing the same to reduce thickness and weight. The organic light emitting display device with a touch sensor removes the necessity of an additional adhesion process by directly forming a touch sensing electrode (152) and a touch driving electrode (154) arranged in parallel and a color filter (192) on an encapsulation layer (140) covering a light emitting device (120), thereby simplifying a manufacturing process and reducing manufacturing costs.