Display Substrate Detection Line Layout for Crack Sensing Shielding
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Solution Overview
Problem
The challenge in flexible OLED and AMOLED display technology is to reduce manufacturing costs and improve yield by effectively detecting cracks in the display panel's backplane circuit, particularly due to signal interference and poor antistatic capability of PCD wiring for detecting touch metal layers, which reduces product yield and makes PCD undetectable.
Innovation Solution
A display substrate design with a first and second detection signal line layout that avoids overlap with signal lines by using a first power line to shield the second detection signal line, reducing signal interference and enhancing antistatic capability, particularly at the bending area and display area junction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PCD detection signals are introduced into the display panel to detect circuit cracks, then crack detection capability is improved, but signal interference and poor antistatic capability occur in the PCD wiring
Solution Approach 1:
The patent introduces a shielding structure as an intermediary element between the PCD detection signal lines and other signal lines. This shielding structure acts as a mediator that blocks electromagnetic interference from affecting the PCD detection signals, thereby resolving the signal interference problem while maintaining crack detection capability. The shielding structure includes shielding electrodes and shielding insulation layers that physically separate and protect the detection signals.
Solution Approach 2:
The patent converts the potentially harmful electromagnetic interference into a beneficial shielding effect by strategically placing conductive shielding structures. The shielding electrodes, which could otherwise be sources of interference or consume additional materials, are utilized to create electromagnetic shields that protect the PCD detection lines. This transforms the presence of additional conductive elements from a potential harm into a protective benefit.
2Device complexity
If the PCD wiring is placed close to signal lines for compact design, then device complexity is reduced, but signal interference increases and antistatic capability deteriorates
Solution Approach 1:
The patent introduces shielding insulation layers and shielding electrodes as intermediary structures between the PCD wiring and adjacent signal lines. These intermediaries maintain the compact layout by allowing close proximity of wiring while simultaneously providing electromagnetic isolation. The shielding insulation layers physically separate the conductors, preventing direct interference while maintaining overall device compactness.
Solution Approach 2:
The patent applies local quality enhancement by providing shielding structures specifically at critical locations where PCD detection lines intersect or run parallel to other signal lines. Rather than uniformly increasing spacing throughout the entire display panel, the shielding is applied locally at problem areas, maintaining compact overall design while providing targeted protection against interference and electrostatic damage.
3Reliability
If the detection signal lines are routed through the bending area to improve yield, then crack detection reliability is improved, but the wiring becomes more vulnerable to electrostatic injury
Solution Approach 1:
The patent introduces a power line as a shielding intermediary that runs through the bending area alongside the detection signal lines. This power line acts as a Faraday shield, creating an electromagnetic barrier that protects the detection signals from electrostatic charges that may accumulate during the bending and flexing of the display panel. The shielding structure is specifically positioned to cover the vulnerable bending region.
Solution Approach 2:
The patent implements beforehand cushioning by pre-establishing shielding structures in the bending area before the display panel undergoes flexing or encounters electrostatic conditions. The shielding electrodes and insulation layers are integrated into the panel structure in advance, creating a protective environment that cushions the detection signals against future electrostatic injury during bending operations or normal use.
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
The design improves antistatic capability and product yield by effectively shielding signal interference, ensuring reliable crack detection and reducing the risk of electrostatic injury.
Implementation Method 1
A display substrate design with a first and second detection signal line layout that avoids overlap with signal lines by using a first power line to shield the second detection signal line, reducing signal interference and enhancing antistatic capability
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a base substrate, a plurality of signal lines, a first power line, at least one first detection signal line and at least one second detection signal line. At a side close to a bending area and outside an area where an orthographic projection of the first power line on a substrate surface of the base substrate, orthographic projections of the at least one first detection signal line and the at least one second detection signal line on the substrate surface of the base substrate have no overlap with orthographic projections of the plurality of signal lines on the substrate surface of the base substrate.