Touchscreen Panel Wing Pattern Electrode Design for Active Pen Sensing
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Solution Overview
Problem
Flexible organic light emitting display devices face challenges with parasitic capacitance and weak active pen touch performance due to the structural arrangement of touch electrodes, which affects the RC delay time and sensing force.
Innovation Solution
A touchscreen panel design featuring first and second touch electrodes with bar shapes that intersect, along with wing patterns on their longitudinal sides, to enhance active pen touch performance while maintaining finger touch sensitivity, by adjusting the distance between wing patterns and electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If metal mesh electrodes are used to reduce resistance and improve flexibility, then electrical conductivity and flexibility are improved, but reflectance increases causing visibility issues and brightness degradation
Solution Approach 1:
The patent applies local quality by making touch electrodes transparent in the emission area (where OLED pixels emit light) and using metal mesh electrodes in the non-emission area (banks). This allows the electrodes to have high conductivity where needed while maintaining transparency and brightness where light emission occurs. The transparent electrode material (such as ITO) is used specifically in regions where visibility and brightness are critical.
2Length of stationary object
If touch electrodes are positioned closer to reduce device thickness, then thinness is improved, but parasitic capacitance increases causing RC delay problems
Solution Approach 1:
The patent applies local quality by differentiating electrode transparency based on location: transparent electrodes are used in emission areas where thinness is critical and visibility must be maintained, while metal mesh electrodes are used in non-emission areas where parasitic capacitance can be managed. This spatial differentiation allows the device to achieve thinness without uniformly increasing parasitic capacitance across all electrode regions.
3Device complexity
If bar-shaped touch electrodes are arranged to reduce complexity, then device complexity is reduced, but active pen touch sensing force becomes weak
Solution Approach 1:
The patent applies local quality by using transparent electrodes with extended shapes (such as U-shapes or L-shapes) in emission areas to enhance active pen sensing force where needed, while using simpler bar-shaped metal mesh electrodes in non-emission areas. This allows the electrode structure to be optimized locally for sensing performance in critical areas without increasing overall device complexity uniformly across the entire touchscreen.
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
The design improves active pen touch performance and maintains desired finger touch performance by optimizing the capacitance and sensing signals, providing superior active pen sensing capabilities compared to traditional designs.
Implementation Method 1
the organic light emitting element includes an anode, a hole transporting layer, an organic light emitting layer, an electron transporting layer, and a cathode. In this case, when a high-level voltage is applied to the anode, and a low-level voltage is applied to the cathode, holes and electrons migrate to the organic light emitting layer via the hole transporting layer and the electron transporting layer, respectively, and are then coupled in the organic light emitting layer, and, as such, light emission is achieved.
Implementation Method 2
One of the first and second touch electrodes functions as a driving electrode Tx for applying a touch signal, and the other of the first and second touch electrodes functions as a sensing electrode Rx for sensing a variation in capacitance caused by touch, thereby sensing touch.
Implementation Method 3
Such a metal mesh electrode exhibits high reflectance, as compared to a transparent conductive material, and, as such, may have a high possibility to be externally visible.
Data Source
AI summary
Disclosed is a touchscreen panel capable of achieving an enhancement in active pen touch performance while securing a desired finger touch performance. A touchscreen integrated display device using the touchscreen panel is also disclosed. The touchscreen panel includes first touch electrodes each extending in a first direction while having a bar shape, second touch electrodes insulated from the first touch electrodes, each second touch electrode extending in a second direction while having a bar shape, to overlap with the first touch electrodes at predetermined portions thereof, first wing patterns formed at opposite longitudinal sides of each first touch electrode in regions where the first touch electrode does not overlap with the second touch electrodes, respectively, and second wing patterns formed at opposite longitudinal sides of each second touch electrode in regions where the second touch electrode does not overlap with the first touch electrodes, respectively.