Display Panel with Additional Electrode Layer for Touch Sensitivity
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Solution Overview
Problem
The mutual capacitance variation in OLED display panels is very small due to thicker films or increased load on touch electrodes, making it difficult to detect touches accurately and leading to issues such as reduced touch accuracy and sensitivity.
Innovation Solution
Incorporating an additional electrode layer with additional electrodes connected via vias in an insulating layer to increase mutual capacitance variation, enhancing the electric field and reducing overall resistance, thereby improving touch sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an additional electrode layer is added to increase mutual capacitance variation, then touch sensitivity and accuracy are improved, but device complexity increases
Solution Approach 1:
The patent adds an additional electrode layer in a different dimensional plane (layer) from the existing touch electrode layer. This vertical stacking approach increases mutual capacitance variation by creating additional capacitive coupling paths without significantly increasing lateral footprint, thereby improving touch sensitivity while managing structural complexity through spatial optimization.
2Strength
If the film thickness is increased, then manufacturing robustness is improved, but mutual capacitance variation decreases making touch detection difficult
Solution Approach 1:
By introducing an additional electrode layer in a vertical stack configuration, the patent compensates for the reduced capacitance variation caused by thicker films. The multiple-layer structure creates additional capacitive interfaces that collectively maintain sufficient signal variation for accurate touch detection, even when individual film layers are thicker for manufacturing robustness.
Solution Approach 2:
The patent combines multiple electrode layers (touch electrode layer and additional electrode layer) to create a composite capacitive structure. This merging of layers produces cumulative capacitance effects that maintain adequate mutual capacitance variation despite the presence of thicker individual film layers, thereby preserving both manufacturing robustness and touch detection capability.
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 thicker films and increased load on touch electrodes.
Implementation Method 1
The mutual capacitance variation in OLED display panels is very small due to thicker films or increased load on touch electrodes
Implementation Method 2
enhancing the electric field and reducing overall resistance, thereby improving touch sensitivity and accuracy
Implementation Method 3
the at least one first additional electrode is connected to the at least one first electrode through at least one first via in the insulating layer
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.