Liquid Crystal Module Fingerprint Identification Integration
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Solution Overview
Problem
Conventional liquid crystal displays with both touch and fingerprint identification functions face challenges in thinning due to layered electrode structures, and existing fingerprint identification methods like optical scanning are voluminous, power-intensive, and unreliable for handheld devices.
Innovation Solution
A liquid crystal module design incorporating an array glass substrate, colored light filtering glass substrate, liquid crystal material layer, pixel display layer, detection wire, and sensation electrode layer, with detection wires and sensation electrodes integrated between the light shade layer and liquid crystal material layer, allowing for both fingerprint identification and touch detection functions while reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fingerprint identification structures and touch structures are layer-by-layer disposed on the liquid crystal display in a laminated form, then both touch function and fingerprint identification function are provided, but the thickness of the liquid crystal display increases
Solution Approach 1:
The patent combines the fingerprint identification electrode layer and touch detection electrode layer into a single integrated structure. The detection wires and sensation electrodes are disposed on the same substrate (array glass substrate) rather than using separate laminated layers, thereby reducing overall thickness while maintaining both fingerprint identification and touch detection functionalities.
Solution Approach 2:
The electrode structure is designed to serve multiple functions simultaneously. The same detection wires and sensation electrodes are used for both fingerprint identification and touch detection operations, eliminating the need for separate dedicated layers for each function and thus reducing the overall device thickness.
2Ease of manufacture
If the fingerprint identification chip is spaced from the surface for detecting the fingerprint by a too large distance, then the structure is easier to manufacture, but the fingerprint identification chip is easy to mis-judge the fingerprint
Solution Approach 1:
The patent positions the sensation electrodes at specific locations within the display structure - disposed on the array glass substrate in parallel to the scanning wires, between the pixel display layer and the liquid crystal material layer. This strategic local positioning ensures the electrodes are close enough to the surface for accurate fingerprint detection while maintaining manufacturability through standard layer deposition processes.
3Adaptability or versatility
If optical scanning is used for fingerprint identification, then fingerprint identification function is provided, but the device has a larger volume and consumes much power
Solution Approach 1:
The patent replaces optical scanning mechanisms with an electrical field-based detection system. Instead of using optical components (lenses, light sources, scanners) that are bulky and power-intensive, the invention uses sensation electrodes that detect fingerprint patterns through capacitive coupling, thereby eliminating the need for mechanical/optical scanning systems and significantly reducing power consumption and device volume.
4Adaptability or versatility
If detection wires and sensation electrodes are integrated between the light shade layer and liquid crystal material layer, then thickness is reduced and functionality is enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent divides the electrode structure into distinct functional components: scanning wires for row selection, common signal wires for column selection, detection wires for fingerprint signal acquisition, and sensation electrodes for capacitive sensing. This segmentation allows each component to be optimized for its specific function while being manufactured using standard thin-film deposition and patterning processes, making the complex structure manufacturable through established techniques.
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 enhances the functionality of liquid crystal modules by integrating fingerprint identification and touch detection without increasing thickness, improving reliability and reducing manufacturing complexity, and enabling efficient use of common signal wires for both display and detection tasks.
Implementation Method 1
a liquid crystal material layer (13), disposed between the array glass substrate (11) and the colored light filtering glass substrate (12)
Implementation Method 2
the detection wire and sensation electrode layer (15) has multiple detection wires (151) and multiple sensation electrodes (152)... The detection wires (151) are electrically connected with the sensation electrodes (152)
Data Source
AI summary
A liquid crystal module with fingerprint identification function includes an array glass substrate, a colored light filtering glass substrate, a liquid crystal material layer, a pixel display layer and a detection wire and sensation electrode layer. The liquid crystal material layer, the pixel display layer and the detection wire and sensation electrode layer are disposed between the array glass substrate and the colored light filtering glass substrate. The pixel display layer cooperates with the internal wiring and electrode structures of the detection wire and sensation electrode layer to achieve complex functions of displaying, fingerprint detection/identification and touch control.