Fingerprint Display Panel Layout With 3D Induction Electrode Surface
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Solution Overview
Problem
Capacitive fingerprint sensors face a challenge in maintaining high induction accuracy and pixels per inch due to limited electrode area and fixed distance from the finger, leading to decreased capacitance and induction accuracy.
Innovation Solution
A display panel design featuring a concave-convex structure on the planarization layer with an induction electrode covering its surface, enhancing capacitance and induction accuracy without increasing the electrode's area, integrated with thin film transistors for driving the pixel and induction units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electrode area is increased to improve capacitance, then the induction accuracy is improved, but the pixels per inch decreases and the layout area increases
Solution Approach 1:
The patent transforms the flat two-dimensional electrode structure into a three-dimensional concave-convex structure by adding vertical dimension. The concave portions extend downward into the substrate, increasing the effective electrode surface area and capacitance without increasing the horizontal footprint, thus resolving the contradiction between induction accuracy and pixels per inch
Solution Approach 2:
The induction electrode is nested within the display structure by forming concave portions that extend into the substrate layers. This nesting approach allows the electrode to utilize the vertical space within the existing display panel structure, increasing capacitance without occupying additional lateral space that would reduce pixels per inch
2Measurement precision
If the electrode area is increased to improve capacitance, then the induction accuracy is improved, but the aperture ratio decreases
Solution Approach 1:
By extending the electrode vertically into concave portions rather than expanding horizontally, the patent increases capacitance while minimizing the impact on the visible display area, thus maintaining a higher aperture ratio compared to horizontal expansion approaches
3Measurement precision
If the distance from the finger to the electrode is decreased to improve capacitance, then the induction accuracy is improved, but the device complexity increases
Solution Approach 1:
The concave-convex structure is pre-formed in the substrate during the manufacturing process before the electrode is deposited. This preliminary structuring allows the electrode to achieve optimal capacitance values without requiring post-manufacturing adjustments or complex multi-layer stacking, thereby reducing overall device complexity while maintaining high induction accuracy
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
Improves fingerprint identification accuracy and reduces the layout area demand for the induction electrode, enhancing pixels per inch and aperture ratio while maintaining induction accuracy.
Implementation Method 1
Capacitive fingerprint sensors face a challenge in maintaining high induction accuracy and pixels per inch due to limited electrode area and fixed distance from the finger, leading to decreased capacitance and induction accuracy
Data Source
AI summary
The disclosure provides a display panel, a manufacturing method thereof and a displaying device. The display panel comprises a plurality of display units, and each display unit has an active area for display and an induction area for identifying fingerprints. The display unit comprises a substrate, a planarization layer, a pixel unit and an induction electrode, wherein the planarization layer is arranged on the substrate and comprises a first area and a second area, the first area is opposite to the active area, and the second area is opposite to the induction area and is provided with a concave-convex structure; the pixel unit is arranged on the planarization layer and located in the first area; and the induction electrode is arranged on the planarization layer and covers a concave-convex surface of the concave-convex structure.