LCD Panel Retaining Walls for Fingerprint Signal Noise Reduction
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Solution Overview
Problem
Liquid crystal display panels face challenges in achieving high signal-to-noise ratio and fingerprint recognition accuracy due to interference signals from large-angle reflected light, which affects the accuracy of optical fingerprint recognition technology.
Innovation Solution
The implementation of a liquid crystal display panel design featuring retaining wall structures with black light-absorbing materials and transparent fillings, aligned with light path openings and photosensitive sensor units, along with light-shielding layers and optical micro-lenses to filter and collimate optical signals, thereby improving the signal-to-noise ratio and fingerprint recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a backlight plate is used to provide light source in LCD panel, then display function is enabled, but large-angle reflected light causes interference signals that reduce fingerprint recognition accuracy
Solution Approach 1:
The patent extracts and removes the harmful large-angle reflected light from the optical path by introducing a light-shielding layer with light-shielding openings that selectively block oblique light while allowing perpendicular light to pass through, thereby eliminating interference signals without affecting display function
Solution Approach 2:
The light-shielding layer is designed with localized light-shielding openings at specific positions corresponding to the fingerprint recognition module, creating different optical properties in different regions: the opening areas allow light transmission for fingerprint recognition, while the surrounding light-shielding regions block large-angle reflected light, achieving local optimization of light control
2Ease of manufacture
If light path structure is simplified for manufacturing ease, then manufacturing precision may be compromised, but complex light path structures increase device complexity
Solution Approach 1:
The patent combines multiple functions into the light-shielding layer: it serves as both a light-shielding component for the display and a light-path control structure for fingerprint recognition. The light-shielding openings are directly formed on the light-shielding layer, integrating light path definition with light shielding function, thereby simplifying the overall structure while maintaining manufacturing precision through a single-layer fabrication process
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 design effectively absorbs and collimates large-angle interference signals, enhancing the signal-to-noise ratio and fingerprint recognition accuracy by ensuring that only small-angle light signals are received by the photosensitive sensor units, leading to improved fingerprint recognition performance.
Implementation Method 1
a material of the retaining wall structures is a black light-absorbing material
Implementation Method 2
hollow portions of the retaining wall structures are filled with a transparent material
Data Source
AI summary
The application discloses a liquid crystal display panel, including: a color filter substrate defined with a plurality of light path openings, a driving substrate arranged opposite to the color filter substrate, a liquid crystal layer located between the color filter substrate and the driving substrate, and a plurality of photosensitive sensor units, wherein a plurality of retaining wall structures are provided in the liquid crystal layer, the retaining wall structures are hollow, a top and a bottom of each of the retaining wall structures are both open, a top opening of each of the retaining wall structures is aligned with at least one of the light path openings, and a bottom opening of each of the retaining wall structures is aligned with one of the photosensitive sensor units. The present application can improve signal-to-noise ratios of fingerprint signals through the retaining wall structures.