Integrated OLED Touch Sensor Layout for Thin High-Quality Panels
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Solution Overview
Problem
The integration of a touch screen panel with an organic light emitting device increases costs, reduces yield, deteriorates luminance and viewing angle, and thickens the product due to additional processes and structural complications.
Innovation Solution
A touch sensible organic light emitting device is designed with a substrate, thin film transistor, encapsulation thin films, a planarization layer, and a touch sensor integrated on the same panel, utilizing transparent conductive layers and capacitors to detect touch inputs without increasing thickness, while maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch screen panel is attached to the organic light emitting device, then touch functionality is added, but the overall thickness increases and manufacturing yield decreases
Solution Approach 1:
The patent merges the touch sensor layer with the organic light emitting device structure by integrating the touch sensor between the encapsulation layer and the organic light emitting layer, eliminating the need for a separate attached touch screen panel and thereby reducing overall thickness while maintaining touch functionality
Solution Approach 2:
The patent creates a multi-functional device that combines both display and touch sensing capabilities in a single integrated structure, where the same panel serves both as the light emitting display and as the touch-sensitive interface
2Adaptability or versatility
If a touch screen panel is attached to the organic light emitting device, then touch functionality is added, but manufacturing yield decreases due to additional processes
Solution Approach 1:
The patent combines the manufacturing processes for the organic light emitting device and touch sensor into a single integrated fabrication sequence, eliminating the need for separate attachment processes and thereby improving manufacturing yield while adding touch functionality
3Adaptability or versatility
If a touch screen panel is attached to the organic light emitting device, then touch functionality is added, but display quality deteriorates
Solution Approach 1:
The patent positions the touch sensor in a different spatial dimension (between the encapsulation layer and organic light emitting layer) rather than attaching it externally, which maintains the optical pathways and viewing angles while still providing touch sensing capability
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 integration reduces the overall thickness of the device, improves display characteristics like transmittance and viewing angles, and lowers costs by embedding touch sensing capabilities within the organic light emitting device structure without compromising performance.
Implementation Method 1
A touch sensor disposed on the planarization layer
Implementation Method 2
The injected electrons and holes combine to form excitons and the excitons emit light as discharging energy
Data Source
AI summary
An organic light emitting device includes: a substrate; a thin film transistor disposed on the substrate; an organic light emitting element connected to the thin film transistor and receiving a data voltage; a plurality of encapsulation thin films disposed on the organic light emitting element, and encapsulating the thin film transistor and the organic light emitting element; a planarization layer disposed on the encapsulation thin film; and a touch sensor disposed on the planarization layer.