Display Panel Electrode Layout for Higher Input Sensor Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display devices face challenges in achieving high sensitivity for input sensors due to parasitic capacitances that cause noise and voltage drops, affecting the performance of input sensors.
Innovation Solution
The display device incorporates a design with a first and second sensing electrode, voltage lines with reduced sheet resistance, and a connection to the second electrode via voltage lines to bypass parasitic capacitances, reducing noise and increasing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional input sensor design is used, then device structure is simple, but sensitivity is low due to parasitic capacitances causing noise and voltage drops
Solution Approach 1:
The second electrode is divided into first electrode portion and second electrode portion that are spaced apart, allowing separate voltage line connections. This segmentation enables bypassing parasitic capacitances by providing dedicated voltage supply paths to each electrode portion, thereby reducing noise and improving input sensor sensitivity without significantly complicating the overall structure
Solution Approach 2:
Voltage lines are introduced as intermediary elements to supply voltage directly to the first and second electrode portions. These voltage lines act as mediators that bypass the parasitic capacitance paths, providing stable voltage supply and reducing the harmful effects of parasitic capacitances on sensor performance
2Reliability
If voltage lines are added to bypass parasitic capacitances, then noise is reduced and sensitivity increases, but device complexity increases
Solution Approach 1:
The voltage lines serve multiple functions: they supply voltage to the electrode portions, bypass parasitic capacitances, and provide stable reference potentials for the input sensor. This multi-functionality reduces the need for additional dedicated components, thereby improving reliability without proportionally increasing device complexity
Solution Approach 2:
The voltage supply function is merged with the existing electrode structure by integrating voltage lines with the first and second electrode portions. This combination approach allows the voltage lines to work in conjunction with the existing sensor architecture, reducing the need for separate complex voltage supply circuits
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 enhances the sensitivity of input sensors by minimizing noise and voltage drops, improving the overall performance of the input sensor in display devices.
Implementation Method 1
an input sensor disposed directly on the display panel and that includes a first sensing electrode and a second sensing electrode capacitively coupled to the first sensing electrode
Data Source
AI summary
A display device includes a first electrode portion that overlaps a first sensing electrode of an input sensor, a second electrode portion spaced apart from the first electrode portion and that overlaps a second sensing electrode of the input sensor, a voltage line of a first group that is connected to the first electrode portion, and a voltage line of a second group that is connected to the second electrode portion. The first electrode portion and the second electrode portion correspond to an electrode of a light emitting element.