Display Panel Shielding Layer for Under-Display Camera Mura
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The scanning signal line switch at the boundary of the normal display area and the under-screen camera area in AMOLED display panels causes uneven brightness (Mura) due to differences in potential crosstalk generated by high-low transitions of scanning signals, leading to a complicated wiring environment and parasitic capacitance.
Innovation Solution
A display panel design with a shielding layer between the first switch line and the semiconductor layer, partially covering the connecting portions near the switch line, to reduce parasitic capacitance and uniformity issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If scanning signal lines are switched at the boundary between normal display area and under-screen camera area to improve light transmittance, then light transmittance is improved, but parasitic capacitance difference causes uneven brightness (Mura)
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the scanning signal lines and the semiconductor layer. This shielding layer acts as a mediator to block parasitic capacitance coupling, preventing the harmful electrical interference that causes brightness non-uniformity while allowing the scanning signal lines to be switched at the boundary for improved light transmittance.
Solution Approach 2:
The patent converts the harmful parasitic capacitance effect into a beneficial shielding mechanism. By intentionally placing a shielding layer, the design acknowledges the parasitic capacitance issue and transforms it into a controlled shielding arrangement that protects the semiconductor layer from unwanted coupling, thereby solving the Mura effect while maintaining the switched signal line configuration.
2Illumination intensity
If pixel drive circuit density is reduced in under-screen camera area to improve light transmittance, then light transmittance is improved, but wiring environment becomes complicated at boundary
Solution Approach 1:
The patent resolves wiring complexity by transitioning from a planar two-dimensional layout to a three-dimensional multi-layer structure. Signal lines are arranged in different layers with vertical connections, allowing the first and second sub-signal lines to be positioned at different horizontal locations while maintaining electrical connectivity through the shielding layer and interlayer connections, thereby simplifying the boundary wiring environment.
Solution Approach 2:
The scanning signal lines are segmented into first and second sub-signal lines that are electrically connected through the shielding layer. This segmentation allows each sub-signal line to be positioned in optimal locations for their respective display areas, with the shielding layer serving as a connection point, thereby reducing wiring complexity at the boundary while maintaining signal integrity.
3Manufacturing precision
If shielding layer is added to reduce parasitic capacitance, then brightness uniformity is improved, but device structure becomes more complex
Solution Approach 1:
The shielding layer is designed to serve multiple functions simultaneously: it acts as an electrical shield to block parasitic capacitance, provides a connection pathway between different signal line layers, and serves as a structural support element. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall device complexity while achieving improved brightness uniformity.
Solution Approach 2:
The patent merges the shielding function with the signal line connection function by integrating the shielding layer into the multi-layer signal line structure. The shielding layer is electrically connected to ground and simultaneously serves as a connection element between the first and second sub-signal lines, combining multiple protective and functional roles into a single structural element to minimize added complexity.
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 shielding layer effectively minimizes parasitic capacitance and potential crosstalk, improving brightness uniformity and reducing Mura phenomena in the display panel.
Implementation Method 1
The switch line at the boundary will form a parasitic capacitance between the adjacent active layer film. The scanning signal is an AC signal, and the transition between the high level and the low level will affect a brightness of the pixel display due to capacitive coupling.
Implementation Method 2
The transition between the high level and the low level will affect a brightness of the pixel display due to capacitive coupling.
Data Source
AI summary
A display panel includes a first pixel drive circuit located in a second display area, a second pixel drive circuit located in the first display area, a plurality of scanning signal lines, and a semiconductor layer. The semiconductor layer includes an active portion and a connection portion. The scanning signal line includes a first sub-signal line, a second sub-signal line, and a first switching line connecting the first sub-signal line and the second sub-signal line. A shielding layer is provided between the first switching line and the semiconductor layer, and the shielding layer covers a connecting portion of the first switching line.