OLED Display Touch Sensing via Integrated Electrode Patterns
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a growing demand for organic light emitting diode (OLED) displays that incorporate touch screen panel functionality to enhance user convenience, but existing OLED technologies lack the necessary integration of touch screen capabilities.
Innovation Solution
The integration of a driving unit and a sense unit within the OLED display, where the driving unit supplies scan and data signals to subpixels, and the sense unit detects changes in capacitance formed by electrode patterns to determine touch positions, allowing for multi-touch operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch screen functionality is added to OLED display, then user convenience is enhanced, but device complexity increases
Solution Approach 1:
The patent combines the OLED display structure with touch screen functionality by integrating electrode patterns directly into the OLED structure. The electrode patterns are formed on the same substrate as the OLED electrodes, creating a unified device that performs both display and touch sensing functions, thereby enhancing user convenience without proportionally increasing device complexity
Solution Approach 2:
The OLED display structure is designed to serve multiple functions: it acts as both a light-emitting display and a touch sensor. The electrode patterns serve dual purposes as part of the OLED structure and as sensing elements for touch input, allowing the device to perform multiple functions within a single integrated system
2Measurement precision
If electrode patterns are disposed on the second substrate facing the first substrate, then touch sensitivity is improved, but manufacturing complexity increases
Solution Approach 1:
The electrode patterns are integrated into the existing OLED manufacturing process by forming them on the second substrate during the same fabrication sequence. This approach allows touch-sensitive electrode patterns to be created using the same equipment and processes already in place for OLED manufacturing, improving touch sensitivity without significantly increasing manufacturing complexity
Solution Approach 2:
The electrode patterns are divided into multiple segments or regions that can be independently formed and controlled. This segmentation allows for optimized touch sensitivity in different areas of the display while maintaining compatibility with standard manufacturing processes through modular fabrication approaches
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 solution enables the OLED display to function as a touch screen panel with reduced manufacturing costs, providing an integrated and efficient touch screen capability while maintaining the display's performance.
Implementation Method 1
The sense unit is coupled to the electrode patterns and configured to detect a position based on a change in the capacitance formed in the electrode patterns when a user touches the panel
Implementation Method 2
An organic light emitting element used in an organic light emitting diode (OLED) is an emissive element in which an emission layer is formed between two electrodes disposed on a substrate
Data Source
AI summary
An embodiment of this document provides an organic light emitting diode (OLED) display is provided. The OLED display includes a panel, a driving unit, and a sense unit. The panel includes subpixels, disposed on a first substrate, and electrode patterns disposed on one side of a second substrate. The first substrate and the second substrate are attached to each other, and the electrode patterns are disposed on a side of the second substrate that is facing the first substrate. The driving unit is coupled to the subpixels and configured to supply a scan signal and a data signal to the subpixels. The sense unit is coupled to the electrode patterns and configured to detect a position based on a change in the capacitance formed in the electrode patterns when a user touches the panel.