Texture Image Acquisition Circuit for Residual Charge Neutralization
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Solution Overview
Problem
Existing texture recognition technologies in mobile devices suffer from afterimage phenomena due to residual charges in photosensitive components, leading to unclear and inaccurate texture images, which affect the accuracy and efficiency of fingerprint recognition.
Innovation Solution
A texture image acquisition circuit incorporating a charge neutralization circuit that reverses current direction to neutralize residual charges in photosensitive components between frames, combined with a reference acquisition circuit to reduce noise, ensuring accurate and efficient texture image acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate sensor module is added to capture display defects, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the defect detection sensor with the display pixel structure by integrating a first sensor unit within the first pixel and a second sensor unit within the second pixel. This merging approach allows the sensor module to share the display substrate and control circuits, thereby improving defect detection precision while avoiding the need for a completely separate sensor system that would increase overall device complexity.
Solution Approach 2:
The sensor units are designed to perform multiple functions: they can detect display defects during operation, serve as part of the pixel structure for light emission, and enable pattern image acquisition for quality inspection. This multi-functionality allows the same structural elements to serve both display and sensing purposes, resolving the contradiction between measurement precision and device complexity.
2Measurement precision
If the display panel is divided into multiple regions with different sensor configurations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The display panel is segmented into multiple regions (first region and second region) with different sensor configurations. The first region contains pixels with both first and second sensor units, while the second region contains pixels with only second sensor units. This segmentation allows optimized defect detection in different areas without requiring complete complexity across the entire panel, as each region can be configured according to its specific detection needs.
Data Source
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Figure 2A~2B
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AI summary
A texture image acquisition circuit, a display panel and a texture image acquisition method. The texture image acquisition circuit includes a charge neutralization circuit and a first acquisition circuit, the charge neutralization circuit is electrically connected to the first acquisition circuit, the charge neutralization circuit is configured to receive a first control signal to cause a current flowing through the first acquisition circuit to be a first current, and the charge neutralization circuit is configured to receive a second control signal to cause a current flowing through the first acquisition circuit to be a second current, a direction of the second current and a direction of the first current are opposite to each other; the first acquisition circuit is configured to receive light from a texture and accumulate a first signal amount that is acquired after the light from the texture is converted, so as to acquire a first acquisition value. The texture image acquisition circuit can improve or avoid the afterimage phenomenon caused by residual charge, thereby improving the effectiveness and accuracy of texture recognition.