Shield Electrode Isolates Scanning Line From Metal Anode
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Solution Overview
Problem
The compatibility of optical fingerprint recognition technology with display technology leads to capacitive coupling issues between scanning lines and metal anodes, causing display panels to fail in maintaining a dark state and resulting in poorly lit sub-pixels, which affects the overall display effect.
Innovation Solution
Incorporating a shield electrode between the film layers containing the scanning line and the drain electrode of the light-emitting reset transistor, which is insulated from the drain electrode and overlaps with the overlapping area of the scanning line and metal anode, reduces capacitive coupling and potential changes, ensuring the display panel remains dark in non-light-emitting stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical fingerprint recognition technology is combined with display technology, then the display panel can perform both display and fingerprint recognition functions, but capacitive coupling between scanning lines and metal anodes causes the display panel to fail in maintaining a dark state and sub-pixels to light unintentionally
Solution Approach 1:
An insulation layer is introduced as an intermediary component between the scanning line and the metal anode. This insulation layer acts as a mediator that blocks the capacitive coupling effect, preventing charge transfer between the scanning line and anode while maintaining the structural integration needed for both display and fingerprint recognition functions.
Solution Approach 2:
The harmful capacitive coupling effect is extracted and isolated by removing the direct electrical connection path between the scanning line and metal anode through the insulation layer. This separates the problematic interaction while preserving the functional integration of the display and fingerprint recognition systems.
2Measurement precision
If the scanning line and metal anode have overlapping areas to enable fingerprint recognition, then fingerprint detection is improved, but capacitive coupling increases causing unintended sub-pixel lighting
Solution Approach 1:
The insulation layer serves as a mediator positioned in the overlapping region between the scanning line and metal anode. It allows the structural overlap necessary for fingerprint recognition to be maintained while blocking the harmful capacitive coupling effect that would otherwise cause unintended sub-pixel lighting.
Solution Approach 2:
The insulation layer is specifically positioned in the overlapping region where the scanning line and metal anode intersect. This localized application addresses the capacitive coupling problem only where it occurs, preserving fingerprint recognition accuracy in the overlapping area while preventing harmful effects.
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 solution effectively minimizes capacitive coupling, preventing unintended lighting of sub-pixels and enhancing the image display effect by maintaining a dark state, thereby improving the overall performance of the display panel.
Implementation Method 1
decrease a capacitive coupling between a scanning line and a metal anode
Implementation Method 2
a shield electrode disposed between a film layer in which the first scanning line is disposed and a film layer in which the drain electrode is disposed
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes a display assembly and a fingerprint recognition assembly. The display assembly includes a base substrate, a plurality of pixel units disposed on one side of the base substrate and a first scanning line extending along a first direction, each of the plurality of pixel units includes a pixel driving unit and a light-emitting unit disposed on one side of the pixel driving unit facing away from the base substrate, and the light-emitting unit includes a metal anode. The fingerprint recognition assembly is configured to perform fingerprint recognition according to light reflected by a touch object to a fingerprint recognition unit. A vertical projection of the first scanning line on the base substrate and a vertical projection of the metal anode on the base substrate have an overlapping area.