OLED Touch Electrode Stack for Higher Mutual Capacitance Variation
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Solution Overview
Problem
The thickness of films on touch electrodes in OLED display panels and the increased load on these electrodes result in very small mutual capacitance variations, making it difficult to detect touches accurately and leading to issues such as touch accuracy and touch jitter, which are not effectively addressed by existing technologies, and are not effectively solved. The touch sensitivity and accuracy of the display panel are improved by providing an additional electrode layer that increases the mutual capacitance variation and reduces overall resistance.
Innovation Solution
The display panel includes an additional electrode layer with first and second additional electrodes connected to the first and second electrodes through vias in an insulating layer, enhancing the electric field and capacitance variation at the edge regions, thereby improving touch sensitivity and reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If films on touch electrodes are made thicker to improve durability, then reliability is improved, but mutual capacitance variation becomes very small making touch detection difficult
Solution Approach 1:
The patent introduces a new spatial dimension by adding an additional electrode layer beneath the traditional touch electrode layer. This multi-layer vertical arrangement increases the overall capacitance variation without requiring thicker film materials, thereby maintaining touch detection sensitivity while ensuring film durability.
Solution Approach 2:
The patent merges multiple electrode layers (touch electrode layer and additional electrode layer) into a unified capacitive sensing system. By combining the capacitance contributions from both layers, the system achieves enhanced mutual capacitance variation that improves touch detection while allowing the use of durable thin films.
2Measurement precision
If additional electrode layer is added to increase mutual capacitance variation, then touch sensitivity is improved, but device complexity increases
Solution Approach 1:
The additional electrode layer serves multiple functions simultaneously: it acts as a sensing electrode for touch detection, provides structural support, and helps shield against external interference. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity despite adding an electrode layer.
Solution Approach 2:
The patent modifies the electrical parameters of the touch sensing system by introducing an additional electrode layer with specific capacitance characteristics. This parameter change increases the overall mutual capacitance variation, improving touch sensitivity without requiring complex structural modifications to the existing display panel architecture.
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 additional electrode layer increases mutual capacitance variation, enhances touch sensitivity, and improves touch accuracy, linearity, and reduces resistance, addressing the challenges of detecting touches in OLED display panels.
Implementation Method 1
mutual capacitance variation
Implementation Method 2
enhancing the electric field and capacitance variation
Data Source
AI summary
The present disclosure provides a display panel and a display apparatus. The display panel includes: a display substrate; a touch electrode layer on a light outgoing side of a display substrate and including at least one first electrode and at least one second electrode, which intersect with each other and are insulated from each other; an additional electrode layer in a layer different from the touch electrode layer and including at least one first additional electrode, wherein an orthographic projection of the at least one first additional electrode on the display substrate at least partially overlaps an orthographic projection of a corresponding first electrode on the display substrate; and an insulating layer between the additional electrode layer and the touch electrode layer; wherein the at least one first additional electrode is connected to the corresponding first electrode through at least one first via in the insulating layer.