Fingerprint Detection Anti-Interference Structure
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Solution Overview
Problem
Current fingerprint identification technologies integrated into display apparatuses face challenges in accurately determining which portions of the current signal generated by the fingerprint detector are due to reflection by the fingerprint, leading to interference from light sources and reduced accuracy.
Innovation Solution
A display apparatus is designed with a fingerprint identification anti-interference structure, including a guest-host effect cell and photonic crystal structures, which are integrated into the display panel to prevent mutual interference of fingerprint-reflected light from adjacent sub-pixels, allowing the photosensitive element to receive only light reflected directly above the sub-pixel, thereby enhancing identification accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the fingerprint detector receives light from adjacent sub-pixels, then the detection area is increased, but the measurement precision deteriorates due to interference from non-fingerprint light
Solution Approach 1:
A light blocking structure is introduced as an intermediary element between adjacent sub-pixels to selectively block stray light while allowing fingerprint-reflected light to reach the detector. This mediator structure enables the detector to receive light from a broader area while maintaining measurement precision by filtering out interfering light from non-fingerprint regions
Solution Approach 2:
The harmful interfering light from adjacent sub-pixels is extracted and removed from the detection path using light blocking structures. By taking out only the unwanted light components while preserving the useful fingerprint-reflected light, the system achieves both extended detection area and maintained measurement precision
2Measurement precision
If light from adjacent sub-pixels is blocked, then the measurement precision is improved, but the device complexity increases due to additional anti-interference structures
Solution Approach 1:
The light blocking structures are merged with existing display apparatus components such as the fingerprint detector housing or adjacent pixel structures. By combining the anti-interference function with existing structural elements, the measurement precision is improved without proportionally increasing device complexity
Solution Approach 2:
Thin light blocking films or shells are used to achieve light blocking functionality with minimal added complexity. These thin film structures can be integrated into existing layers of the display apparatus, providing precise light control while maintaining a compact and simple overall device structure
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 effectively prevents interference from adjacent sub-pixels, allowing for improved accuracy in fingerprint identification by ensuring the photosensitive element receives only the light reflected by the fingerprint directly above, enhancing the uniqueness and accuracy of fingerprint recognition.
Implementation Method 1
liquid crystal molecules between the first substrate and the second substrate
Implementation Method 2
the fingerprint identification anti-interference structure includes a guest-host effect cell
Implementation Method 3
a first photonic crystal structure, the first photonic crystal structure having a periodic structure in which photonic band gaps are generated in both a first direction and a second direction
Implementation Method 4
optical signals reflected by a fingerprint of a user are detected and current signals are generated according to the optical signals by means of a fingerprint detector
Data Source
AI summary
A display apparatus includes a display panel including a first sub-pixel and a second sub-pixel adjacent to the first sub-pixel; a first fingerprint identification device including a first photosensitive element, an orthographic projection of the first photosensitive element on the display panel being located within the first sub-pixel; and a fingerprint identification anti-interference structure on a light exiting side of the display panel. The fingerprint identification anti-interference structure is configured to shield the first photosensitive element from light emitted from the second sub-pixel and reflected by a fingerprint.