Fingerprint Identification via Segmented Pixel Light Emission
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Solution Overview
Problem
Existing display devices face challenges in accurate fingerprint identification due to complex light reflection paths and high noise levels caused by multiple light sources, making it difficult to determine the source of reflected light and resulting in inaccurate fingerprint patterns.
Innovation Solution
A display device and fingerprint identification method where only part of the pixel units emit light during fingerprint identification, while others remain off, simplifying the light path and reducing noise by using a control unit to manage light emission and an analysis unit to process signals from light sensing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If all pixel units emit light simultaneously for fingerprint identification, then the light coverage is sufficient, but the light reflection path becomes complex and noise increases
Solution Approach 1:
The patent divides the pixel units into multiple groups that emit light sequentially rather than simultaneously. Each group covers a specific region, and by segmenting the light emission in time and space, the system maintains sufficient light coverage while simplifying the light reflection path for each sensing unit, thereby reducing noise and improving fingerprint identification accuracy.
Solution Approach 2:
The patent implements periodic light emission by controlling different groups of pixel units to emit light in alternating time intervals. This periodic action ensures that each light sensing unit receives light from a specific, time-limited source, making the light path traceable and reducing interference from other pixel units, thus improving measurement precision while maintaining overall illumination coverage.
2Power
If multiple pixel units emit light simultaneously, then the signal strength is sufficient, but it becomes difficult to determine the source of reflected light
Solution Approach 1:
The patent segments the pixel units into distinct groups that emit light sequentially. Each light sensing unit corresponds to specific pixel unit groups, and by activating only the relevant groups at each time interval, the system maintains sufficient signal strength for detection while making it easy to identify which pixel units are the light sources, thus resolving the difficulty of light source identification.
Solution Approach 2:
The patent introduces time intervals as an intermediary mechanism to separate the light emission from different pixel unit groups. By using time as a mediator, the system ensures that only one group emits light at a time, making it straightforward to trace the reflected light back to its source while maintaining adequate signal strength through sequential activation.
3Adaptability or versatility
If all pixel units emit light during fingerprint identification, then the display function is maintained, but the noise in sensed signal increases
Solution Approach 1:
The patent segments pixel units into multiple groups that can be controlled independently. During fingerprint identification, only specific groups are activated to emit light, reducing the overall noise in the sensed signal while maintaining the display function. The non-activating pixel units continue to display content, ensuring versatility is preserved.
Solution Approach 2:
The patent applies local quality control by activating only the pixel unit groups that are spatially relevant to the fingerprint sensing area. This localized light emission reduces noise from distant pixel units while maintaining adequate illumination for fingerprint identification, and the display function is preserved in both active and inactive regions through appropriate control strategies.
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 approach enhances the accuracy of fingerprint identification by reducing noise and simplifying the light path, resulting in higher signal-to-noise ratios and more precise fingerprint recognition.
Implementation Method 1
The valley 91 and the ridge 92 of the fingerprint reflect light differently, so the sensed signals (such as photocurrent) generated by the light sensing units 1 at positions corresponding to the valley 91 and the ridge 92 are also different.
Implementation Method 2
a plurality of light sensing units 1 arranged in the first substrate 51... generating sensed signals (such as photocurrent)
Data Source
AI summary
The present disclosure provides a display device and a fingerprint identification method thereof, which belong to the field of fingerprint identification technology and can solve the existing problems of complex reflective light path in the process of fingerprint identification, large noise in the sensed signal and low accuracy of fingerprint identification. The display device in which the fingerprint identification method of a display device of the present disclosure is applicable comprises a plurality of pixel units for display, and a plurality of light sensing units for generating a sensed signal based on intensity of received light; the fingerprint identification method comprises: enabling part of the pixel units to emit light and keeping other pixel units not to emit light, and performing fingerprint identification based on the sensed signal generated by the plurality of light sensing units.