Display Panel Shielding Lines for Signal Crosstalk Reduction
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Solution Overview
Problem
The increasing number of display and touch segments in capacitive touch panels leads to a higher number of signal shielding lines, increasing production costs and reducing process yield due to the need for more pads connected to the touch-control chip.
Innovation Solution
A display panel design with first-type signal shielding lines arranged between touch and display signal lines, connected to a fixed voltage signal and electrically connected to first power lines on both sides of the bending sub-area, eliminating the need for additional pads and reducing signal interference by maintaining constant capacitance and voltage difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of display and touch segments increases, then the display resolution and touch precision are improved, but the number of signal shielding lines increases, resulting in increased production cost and reduced process yield
Solution Approach 1:
The patent merges the signal shielding function with existing power line structures. The first power lines, which are already present in the display panel for power supply, are configured to serve dual purposes: maintaining electrical connections and providing signal shielding between touch signal lines and display signal lines. This eliminates the need for separate dedicated shielding lines, thereby reducing device complexity while maintaining shielding effectiveness.
Solution Approach 2:
The power lines are designed to perform multiple functions simultaneously. Besides their primary function of supplying power to various components, the first power lines act as signal shielding lines by being positioned between touch signal lines and display signal lines in the non-display area. This multi-functionality reduces the overall number of conductive elements needed, lowering production cost and improving process yield.
2Object-affected harmful factors
If the number of signal shielding lines increases, then the signal interference between touch and display lines is reduced, but the number of pads connected to touch-control chip increases, resulting in increased production cost
Solution Approach 1:
The patent combines the shielding function with existing power line infrastructure. Instead of adding separate shielding lines that would require additional pads for connection, the design utilizes the already-present first power lines for shielding purposes. The power lines are routed to pass through the non-display area and are positioned to shield both touch and display signal lines, thereby providing interference protection without increasing pad count.
Solution Approach 2:
The power lines serve themselves dual purposes. By designing the power line routing to pass through the non-display area and position them between signal lines, the power distribution network automatically provides signal shielding as a byproduct of its primary function. This self-service approach eliminates the need for separate dedicated shielding structures and their associated connection pads.
3Object-affected harmful factors
If additional signal shielding lines are added in the non-display area, then the signal crosstalk is reduced, but the manufacturing complexity and production cost increase
Solution Approach 1:
The patent integrates the shielding function into the existing power line layout. The first power lines are configured to extend through the non-display area and are positioned to provide shielding between touch signal lines and display signal lines. This merging of functions allows the manufacturing process to produce both power distribution and signal shielding in the same structural elements, without requiring additional manufacturing steps or complex multi-layer routing.
Solution Approach 2:
The shielding structure uses the same material and fabrication process as the existing power lines. Since the first power lines are already part of the standard display panel manufacturing process, utilizing them for shielding maintains material and process homogeneity. This approach avoids introducing new materials or complex multi-step fabrication processes, thereby keeping manufacturing simple and cost-effective.
Data Source
AI summary
A display panel and electronic device are provided. The display panel comprises a plurality of touch signal lines, a plurality of display signal lines, a plurality of first-type signal shielding lines, and a plurality of first power lines. The first-type signal shielding line is arranged in the non-display area, and the first-type signal shielding line is located between the touch signal line and the display signal line. The first power line is connected to a fixed voltage signal, and the first-type signal shielding line is electrically connected to the first power lines respectively on both sides of the bending sub-area.