Touch Functional Layer Layout for Narrow-Bezel Display Panels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display panel designs face challenges in reducing bezel width due to the increased area occupied by bent peripheral lines in the fanout region, leading to higher resistance differences and non-uniform voltage drops in touch sensor signals, which affects touch control accuracy and bezel narrowing.
Innovation Solution
The display panel incorporates a design with varying resistance touch lines and compensation lines, including first and second touch lines with different resistances, and compensation lines that are bent and connected to balance resistance, along with a folding mechanism to reduce bezel width by routing lines on the non-display side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If peripheral lines are bent in the fanout region to reduce bezel width, then bezel width is reduced, but resistance difference between touch lines increases
Solution Approach 1:
The patent applies local quality by creating different touch line configurations in different regions. First touch lines are designed with longer paths through the fanout region while second touch lines have shorter paths, and compensation lines are strategically placed to balance the resistance differences locally across the display panel.
Solution Approach 2:
The patent changes physical parameters by introducing compensation lines with specific resistance values that counterbalance the resistance differences caused by the bent peripheral lines. The compensation lines are designed with varying lengths and configurations to adjust and equalize the total resistance across different touch lines.
2Length of moving object
If peripheral lines are bent in the fanout region to reduce bezel width, then bezel width is reduced, but voltage drop uniformity deteriorates
Solution Approach 1:
The patent addresses voltage drop uniformity by implementing local compensation through compensation lines that are positioned adjacent to specific touch lines. Each compensation line is designed to offset the voltage drop in its corresponding touch line, ensuring uniform voltage distribution across the display panel despite the bent peripheral lines.
Solution Approach 2:
The patent achieves equipotentiality by designing compensation lines that create equal potential conditions across different touch lines. The compensation lines are configured to ensure that all touch lines have equal resistance to their respective touch units, maintaining uniform voltage levels across the display panel.
3Reliability
If compensation lines are added to balance resistance, then touch control accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of touch lines and compensation lines into integrated line groups. The compensation lines are designed to work in conjunction with specific touch lines, combining their functions to achieve both signal transmission and resistance compensation without requiring separate independent compensation circuits.
Solution Approach 2:
The compensation lines serve multiple functions: they compensate for resistance differences, maintain voltage uniformity, and work together with touch lines to enable accurate touch control. This multi-functionality reduces the need for additional separate components and simplifies the overall device architecture.
Data Source
AI summary
A display panel has a display region, and a bending region and a bonding region. The display panel includes a display substrate and a touch functional layer disposed on the display substrate. The touch functional layer includes touch units disposed in the display region, at least portion of each of touch lines and compensation lines. Each touch unit is electrically connected to at least one touch line. The touch lines include at least one first touch line and at least one second touch line, and a resistance of the at least one first touch line is greater than a resistance of the at least one second touch line. At least part compensation lines of the compensation lines are disposed on the side of the bending region away from the display region. A second touch line is electrically connected to at least one compensation line.