OLED Display Panel Touch-Line Shielding for Narrow-Bezel Accuracy
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Solution Overview
Problem
Existing OLED touch display screens face issues with touch signal deviation and reduced touch detection performance due to capacitive coupling interference between touch lines, particularly in narrow frame designs, which complicates manufacturing and affects structural simplicity.
Innovation Solution
The display panel design includes a driving array layer with a first metal layer that integrates touch signal lines and fixed potential signal lines, with no additional metal layers between, allowing for increased spacing and reducing capacitive coupling by using fixed potential signal lines as shields, thus improving touch detection accuracy and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a narrow frame design is adopted with COF bending method, then the screen-to-body ratio is increased, but capacitive coupling interference between touch lines occurs causing touch signal deviation
Solution Approach 1:
The patent introduces fixed potential signal lines as intermediary shielding structures between adjacent touch signal lines. These shielding lines act as mediators that block capacitive coupling interference between touch lines, resolving the touch signal deviation problem caused by narrow frame design while maintaining the high screen-to-body ratio achieved through COF bending.
Solution Approach 2:
The patent utilizes the vertical dimension by stacking multiple metal layers in the driving array layer. Touch signal lines are disposed on different metal layers at different heights, creating vertical separation that reduces capacitive coupling interference in the horizontal plane. This multi-layer stacking approach enables narrow frame design without compromising touch detection accuracy.
2Manufacturing precision
If multiple metal layers are added for shielding between touch lines, then touch detection accuracy is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent makes the driving array layer's metal layers serve dual functions: both for driving the OLED display and for shielding touch signal lines. The existing metal layers in the driving array layer are utilized for both purposes, eliminating the need for separate dedicated shielding layers and reducing overall device complexity.
Solution Approach 2:
The patent merges the shielding function with the driving array layer structure. Fixed potential signal lines for shielding are integrated into the same metal layers that carry driving signals, combining multiple functions into a single structural system rather than adding separate shielding components.
3Length of stationary object
If touch signal lines are closely spaced to reduce frame width, then narrow frame design is achieved, but capacitive coupling interference increases causing touch signal deviation
Solution Approach 1:
Fixed potential signal lines are introduced as intermediary shielding structures between closely spaced touch signal lines. These shielding lines block capacitive coupling interference between adjacent touch lines, enabling narrow frame design with closely spaced lines without compromising touch signal accuracy.
Solution Approach 2:
The patent uses fixed potential signal lines maintained at constant potentials (such as power supply or ground potentials) to create equipotential regions between touch signal lines. This equipotential shielding prevents voltage differences from causing capacitive coupling interference, allowing closer line spacing while maintaining signal integrity.
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 touch detection performance and manufacturing efficiency by minimizing capacitive coupling interference and maintaining structural simplicity, while achieving a narrow frame design without additional shielding structures.
Implementation Method 1
coupling interference between touch lines of the touch function layer... may cause coupling interference between touch lines
Data Source
AI summary
Display panel and display device are provided. The display panel includes a display area and a non-display area. The non-display area includes a bending area and a first area. The first area is located on a side of the bending area away from the display area. The display panel comprises a substrate, a driving array layer disposed on a side of the substrate, and a touch function layer disposed on a side of the driving array layer away from the substrate. The driving array layer includes a first metal layer. In the first area, the first metal layer includes a plurality of first touch signal lines and a plurality of first fixed potential signal lines. At least one first fixed potential signal line of the plurality of first fixed potential signal lines is disposed between two adjacent first touch signal lines of the plurality of first touch signal lines.