Organic Light-Emitting Display Grounding for Touch Noise Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible organic light emitting display devices face issues with voltage fluctuations and electric fields causing touch noise and non-uniform luminance due to rising low potential voltage, especially in larger sizes and foldable designs.
Innovation Solution
Incorporating a ground structure with metal support members and additional flexible circuit films to stabilize low potential voltage and suppress electric fields, using conductive sheets and grounding to reduce voltage differences between the display panel and touch panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the display device is made thin and flexible using plastic films, then the device achieves light weight and flexibility, but voltage fluctuations occur causing touch noise
Solution Approach 1:
A ground structure including a ground electrode and ground line is introduced as an intermediary element between the thin film transistor substrate and the touch panel. This ground structure serves as a mediator to shield the touch panel from voltage fluctuations generated by the thin film transistor, thereby maintaining touch panel stability while preserving the device's thin and flexible characteristics
Solution Approach 2:
The ground structure is designed to maintain equipotential conditions across the display device by providing a reference potential through the ground electrode and ground line. This equipotential design counteracts voltage fluctuations in the thin film transistor, preventing touch noise while maintaining the lightweight flexible structure
2Area of stationary object
If the display device size is increased, then the display area is enlarged, but low potential voltage rises causing non-uniform luminance and touch noise
Solution Approach 1:
The ground structure is segmented into multiple components including a ground electrode, ground line, and ground connection structure distributed across the display device. This segmentation allows the ground potential to be maintained uniformly across large display areas by providing multiple reference points, thereby preventing voltage rise and ensuring uniform luminance and stable touch performance
Solution Approach 2:
The ground structure acts as an intermediary network that distributes reference potential throughout the enlarged display device. This intermediary ground system compensates for voltage drops and potential rises in different regions of the large display, maintaining stable low potential voltage across the entire display area
3Reliability
If a ground structure is added to stabilize voltage, then touch noise is reduced, but device complexity increases
Solution Approach 1:
The ground structure is merged with existing device components by integrating the ground electrode and ground line into the thin film transistor substrate structure. This merging approach allows the ground function to be implemented without adding separate complex subsystems, thereby reducing touch noise while minimizing increases in device complexity
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
Stabilizes low potential voltage, reduces touch noise, and improves touch performance by minimizing voltage fluctuations and electric fields, ensuring uniform luminance and enhanced functionality in foldable displays.
Implementation Method 1
a support member which is disposed below the organic light emitting display panel and is formed of a metal material; a first flexible circuit film which is disposed on one side of the organic light emitting display panel and is bent toward a bottom surface of the support member... The first flexible circuit film, the second flexible circuit film, and the third flexible circuit film are grounded to the support member
Data Source
AI summary
An organic light emitting display device can include an organic light emitting display panel including sub pixels; a support member below the organic light emitting display panel and formed of a metal material; a first flexible circuit film on one side of the organic light emitting display panel, and configured to be bent toward a bottom surface of the support member; a third flexible circuit film on one side of the organic light emitting display panel, and configured to be bent toward the bottom surface of the support member; and a low potential voltage line on the organic light emitting display panel to supply a low potential voltage to the sub pixels. The first and third flexible circuit films are electrically connected to the low potential voltage line, and the low potential voltage is applied to the low potential voltage line via the first and third flexible circuit films.