Optical Fingerprint Module Electrode Layout to Reduce Image Residue
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Solution Overview
Problem
Optical fingerprint sensors suffer from image blurring and low quality due to residual image collection, especially in strong light and low temperature environments, affecting recognition accuracy and increasing false accept rates.
Innovation Solution
A print recognition module with a driving circuit layer, insulating layers, connecting electrodes, and photoelectric conversion portions, where the connecting electrodes directly contact the photoelectric conversion portions, enhancing the electric field range and carrier movement to reduce image residue and improve recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If optical fingerprint sensor collects image continuously, then screen display area is maximized, but image residue accumulates causing blurring and low quality
Solution Approach 1:
The patent applies preliminary action by introducing a light-shading layer before image collection to prevent residual image accumulation. The light-shading layer is positioned to block stray light from entering the photosensitive pixel array during non-collection periods, proactively preventing image residue before it affects recognition quality while allowing full-screen display integration
2Reliability
If light-shading layer is added to reduce image residue, then recognition accuracy improves, but device structure becomes more complex
Solution Approach 1:
The patent merges the light-shading layer with existing structural elements of the optical sensor module, integrating it into the housing or frame structure rather than adding a completely separate component. This combining approach reduces the number of discrete parts and simplifies assembly while still achieving the light-blocking function to improve recognition accuracy
3Manufacturing precision
If light-shading layer blocks stray light, then image quality improves, but light transmission to photoelectric conversion portions may be reduced
Solution Approach 1:
The light-shading layer is designed with local quality by implementing selective light blocking - it blocks stray light from specific angles and regions that would cause image residue, while maintaining transparency or openness in directions where useful light from the fingerprint needs to reach the photoelectric conversion portions. This localized approach ensures both image quality and sufficient light transmission
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 solution reduces the probability of carriers being captured by defect states, thereby improving fingerprint recognition accuracy and image quality by increasing the electric field range and carrier movement speed, minimizing image residue.
Implementation Method 1
a plurality of photoelectric conversion portions on a side, facing away from the first insulating layer, of the connecting electrode layer; where the plurality of photoelectric conversion portions are in correspondence with the plurality of connecting electrodes
Data Source
AI summary
Provided in the present disclosure are a print recognition module and a display apparatus. The print recognition module includes: a base substrate; a driving circuit layer located on one side of the base substrate and including a plurality of driving transistors arranged in an array; a first insulating layer located on the side of the driving circuit layer that is away from the base substrate and including a plurality of first via holes running through the thickness thereof; a connecting electrode layer located on the side of the first insulating layer that is away from the driving circuit layer and including a plurality of connecting electrodes which are in one-to-one correspondence with first electrodes of the driving transistors; and a plurality of photoelectric conversion portions located on the side of the connecting electrode layer that is away from the first insulating layer.