LCD Assembly Fingerprint Sensor Integration and Selective Activation
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Solution Overview
Problem
In liquid crystal display (LCD) assemblies, the existing method of evenly distributing fingerprint identification sensors across the entire screen leads to resource wastage as all sensors are activated for fingerprint identification, which is inefficient and can result in failed identifications if sensors are not positioned correctly under the user's finger.
Innovation Solution
The integration of fingerprint identification sensors and light sensors between the upper and lower polarizers, with selective activation by a control chip, allows for targeted fingerprint identification, reducing resource wastage and ensuring sensors are uniformly dispersed to enhance identification success.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If fingerprint identification sensors are evenly distributed across the entire LCD screen, then the coverage area for fingerprint identification is increased, but resource wastage occurs as all sensors are activated and the identification success rate decreases due to incorrect sensor positioning
Solution Approach 1:
The patent applies local quality by concentrating fingerprint identification sensors in a specific local region (e.g., center area) of the LCD screen rather than evenly distributing them across the entire screen. This ensures sensors are positioned where they are most likely to detect user fingers during normal operation, improving identification success rate while reducing the total number of sensors needed and energy consumed.
Solution Approach 2:
The patent implements partial action by activating only a subset of sensors rather than all sensors simultaneously. The control chip selectively activates sensors based on detected touch positions or predefined activation patterns, reducing energy consumption while maintaining effective fingerprint identification coverage.
2Reliability
If all fingerprint identification sensors are activated for identification, then comprehensive fingerprint scanning is achieved, but resource wastage increases and identification may fail if sensors are not positioned correctly
Solution Approach 1:
The patent applies preliminary action by pre-positioning fingerprint identification sensors in optimal locations on the LCD screen based on expected user interaction patterns. The control chip also performs preliminary detection to determine which sensors are likely to be under the user's finger before activating them for full fingerprint identification, ensuring reliable detection while minimizing energy consumption.
Solution Approach 2:
The patent implements dynamics by enabling the control chip to dynamically select and activate specific sensors based on real-time touch detection or user interaction patterns. This dynamic activation strategy adapts to different usage scenarios, maintaining high identification success rates while optimizing energy consumption by activating only the necessary sensors.
3Reliability
If fingerprint identification sensors are integrated between the upper and lower polarizers, then the sensors are always under the user's finger during operation, but the structural complexity of the LCD assembly increases
Solution Approach 1:
The patent applies merging by integrating the fingerprint identification sensors directly into the LCD assembly structure, specifically positioning them between the upper and lower polarizers. This consolidation ensures sensors are always in the correct position to detect user fingers during screen interaction, improving reliability while actually simplifying the overall device structure by combining two functions (display and fingerprint sensing) into one integrated assembly.
Data Source
AI summary
A liquid crystal display (LCD) assembly and an electronic device are provided. The LCD assembly includes: a touch screen, an upper substrate disposed parallel to the touch screen, a lower substrate disposed parallel to the upper substrate, a liquid crystal layer enclosed between the upper substrate and the lower substrate, an upper polarizer attached to a side of the upper substrate not adjacent to the liquid crystal layer, and a lower polarizer attached to a side of the lower substrate not adjacent to the liquid crystal layer. At least one fingerprint identification sensor is disposed between the upper polarizer and the lower polarizer, and each of the fingerprint identification sensors is electrically connected to the control chip. At least one light sensor is disposed between the upper polarizer and the lower polarizer, and each of the least one light sensor is electrically connected to the control chip.