Display Sensing Electrode Mesh Layout for Smaller Non-Display Areas
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Solution Overview
Problem
Existing display devices face challenges in optimizing the arrangement of sensing electrodes and wirings to reduce the surrounding area while improving display quality and sensor sensitivity, particularly as display shapes diversify.
Innovation Solution
A display device design featuring a conductive layer with first and second sensing electrodes, where the second electrodes have a portion overlapping with the non-display area, and trace lines connected to both, along with a specific mesh line arrangement to enhance sensitivity and reduce the non-sensing area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensing electrodes are arranged to cover the entire display area, then the sensor sensitivity is improved, but the non-display area increases
Solution Approach 1:
The sensing electrode is divided into multiple discrete sensing areas distributed across the display panel. Each sensing area is a separate conductive region that can independently detect inputs. This segmentation allows the sensing function to be distributed without requiring a continuous electrode covering the entire display area, thereby reducing the non-display area while maintaining sensor sensitivity through multiple detection points.
Solution Approach 2:
The patent transitions from a traditional single-layer electrode arrangement to a multi-layer capacitive sensing structure. By adding a second conductive layer and utilizing the vertical dimension for capacitance formation, the system achieves enhanced sensor sensitivity without requiring proportional increases in the horizontal footprint, thus reducing the non-display area.
2Area of stationary object
If the sensing electrode area is reduced, then the non-display area is minimized, but the sensor sensitivity deteriorates
Solution Approach 1:
The patent employs composite capacitive sensing structures combining multiple conductive layers with dielectric materials between them. This composite approach creates multiple capacitive elements that work together to provide enhanced sensitivity. The layered composite structure allows for higher capacitance values and better signal detection within a smaller area, maintaining sensor sensitivity while minimizing the non-display area.
Solution Approach 2:
The system changes the electrical parameters of the sensing electrode by creating multiple capacitive elements with different capacitance values through varied geometric configurations and dielectric layer thicknesses. This parameter optimization allows the reduced electrode area to maintain sufficient sensitivity by adjusting the electrical characteristics rather than relying solely on increasing the physical area.
3Shape
If the display area shape is diversified, then the display quality is improved, but the arrangement of sensing electrodes becomes more complex
Solution Approach 1:
The patent applies different sensing electrode configurations to different regions of the display panel based on local requirements. Each sensing area is independently designed and positioned to match the local display characteristics and input detection needs. This local quality approach allows the sensing electrode arrangement to adapt to diverse display area shapes without requiring a complex unified design, as each region can be optimized independently.
Data Source
AI summary
A display device includes: a display panel including: a base layer including a display area, and a non-display area adjacent to the display area; and a display element layer on the base layer; and an input sensing layer on the display element layer, and including: a first sensing insulating layer; a conductive layer on the first sensing insulating layer, and including a sensing area overlapping with the display area, and a non-sensing area overlapping with the non-display area; and a second sensing insulating layer on the conductive layer. The conductive layer includes: first sensing electrodes overlapping with the sensing area; second sensing electrodes, each including a first portion overlapping with the sensing area, and a second portion connected to the first portion and overlapping with the non-sensing area; and trace lines connected to the first sensing electrodes and the second sensing electrodes.