Capacitive Touch Display Panel Parasitic Capacitance Reduction
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Solution Overview
Problem
Capacitive touch display panels face precision issues due to parasitic capacitance between the touch layer and metal wirings in built-in touch display panels, affecting touch accuracy.
Innovation Solution
The display panel design includes a touch layer with a hollow portion and overlapping portions that minimize direct contact with support posts, reducing parasitic capacitance while maintaining coverage and stability, and incorporates an insulating layer to prevent signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch layer is added to a display panel, then touch functionality is achieved, but parasitic capacitance is generated between the touch layer and metal wirings, affecting touch precision
Solution Approach 1:
An insulating layer is introduced as an intermediary between the first electrode (metal wiring) and the touch layer. This insulating layer acts as a mediator that electrically isolates the two conductive elements, preventing parasitic capacitance formation while allowing the touch layer to maintain its touch detection functionality. The insulating layer fills the space between these two components, blocking direct electrical interaction.
2Ease of manufacture
If the touch layer covers the first electrode completely, then manufacturing is simplified, but parasitic capacitance increases
Solution Approach 1:
The insulating layer serves as a mediator that allows the touch layer to be manufactured in a simplified manner (covering the first electrode area) without directly contacting it. The insulating layer enables this manufacturing approach while simultaneously preventing the harmful parasitic capacitance effect.
Solution Approach 2:
The harmful parasitic capacitance effect is extracted or removed from the system by introducing the insulating layer. This layer extracts the unwanted electrical interaction between the touch layer and first electrode, allowing the touch functionality to operate with improved precision.
3Strength
If support posts are added for mechanical stability, then structural strength is improved, but parasitic capacitance is generated between support posts and touch layer
Solution Approach 1:
The insulating layer acts as an intermediary between the support posts and the touch layer. It provides mechanical support through the support posts while electrically isolating them from the touch layer, preventing parasitic capacitance formation at this interface as well.
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 configuration enhances touch precision and mechanical stability by reducing parasitic capacitance and preventing short circuits, thereby improving the overall performance of the display panel.
Implementation Method 1
incorporates an insulating layer to prevent signal interference
Data Source
AI summary
A display panel includes a pixel defining layer, light-emitting unit, first support post, and touch layer. The light-emitting unit includes first electrode, light-emitting layer, and second electrode. The first support post is located between the pixel defining layer and the first electrode in direction perpendicular to display panel, and is located in non-aperture region of the pixel defining layer. The first electrode covers the light-emitting layer and the first support post. The touch layer is located at a side of the first electrode away from the pixel defining layer, and includes hollow portion, first portion and second portion that are mutually connected. In direction perpendicular to the display panel, both first portion and hollow portion overlap first support post, second portion does not overlap first support post. Overlapping portion of first portion and first supporting post has smaller area than first supporting post. A display device is also provided.