OLED Display Panel With Segmented Common Electrode and Mesh Touch Sensing
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Solution Overview
Problem
The integration of in-cell self-capacitance touch sensing technique into OLED display panels is hindered by noise interference and shielding effects from the common voltage layer, leading to reduced accuracy in touch position detection.
Innovation Solution
An OLED display panel design featuring a common electrode layer with through holes, a display pixel electrode and touch sensing electrode layer with a mesh pattern, an OLED layer, a thin film transistor layer, and an encapsulation layer, along with a first power circuit independent from the OLED display panel's power circuit, and a reflection shielding electrode layer to enhance touch sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-layer transparent electrode structure is used for self-capacitance touch sensing, then multi-touch detection can be realized, but obvious capacitance is produced between the electrode structure and the common voltage layer, causing noises that lower touch position detection accuracy
Solution Approach 1:
The patent divides the common voltage layer into multiple segments (first common voltage layer and second common voltage layer) that are spatially separated and electrically isolated. This segmentation reduces the overall capacitance coupling between the transparent electrode structure and the common voltage layer, thereby decreasing noise interference and improving touch position detection accuracy while preserving multi-touch detection capability.
2Ease of operation
If conductive wires are used to transmit electrical signals from transparent electrodes, then signal transmission is achieved, but the area of the conductive wires cannot be used to sense capacitance variation, resulting in dead areas for touch detection
Solution Approach 1:
The patent merges the function of signal transmission and touch sensing by making the transparent electrode structure itself serve dual purposes: it transmits electrical signals while its entire surface area participates in capacitance sensing. The segmented common voltage layer configuration allows the electrode areas to be fully utilized for touch detection without being obstructed by separate conductive wire structures, eliminating dead zones.
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 design significantly increases the yield rate of integrating in-cell self-capacitance touch sensing and accurately detects touch positions, reducing noise interference and shielding effects, making it more suitable for touch panel designs in OLED displays.
Implementation Method 1
a capacitive touch panel uses a capacitance change generated in an electrostatic combination of the arranged transparent electrodes with a human body to generate a current or voltage for detecting touch coordinates
Implementation Method 2
a capacitive touch panel uses a capacitance change generated in an electrostatic combination of the arranged transparent electrodes with a human body
Data Source
AI summary
An OLED display panel includes a common electrode layer, a display pixel electrode and touch sensing electrode layer, an OLED layer, a lower substrate, a thin film transistor layer, and an encapsulation layer. The common electrode layer has plural through holes defined therein. The display pixel electrode and touch sensing electrode layer includes plural display pixel electrodes and plural touch sensing electrodes, wherein each touch sensing electrode has a mesh type pattern. The OLED layer is configured between the common electrode layer and the display pixel electrode and touch sensing electrode layer. The thin film transistor layer is disposed at one side of the lower substrate facing the OLED layer. The encapsulation layer is disposed at the other side of the common electrode layer facing the OLED layer. A first power circuit for the touch sensing electrodes is independent to a second power circuit for the OLED display panel.