Liquid Crystal Displays With Optical Sensors and Noise-Reducing Wiring
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Solution Overview
Problem
Biometric information detected in liquid crystal display devices with optical sensors is affected by wiring lines, leading to insufficient detection accuracy due to noise interference.
Innovation Solution
A liquid crystal display device with an optical sensor is designed to include a collimating layer that blocks light inclined to the normal direction, ensuring incident light is parallel, and power feeding lines are positioned between signal lines to minimize noise interference, enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical sensors are integrated into liquid crystal display devices for biometric detection, then the functionality and versatility of the device are improved, but detection accuracy deteriorates due to noise interference from display wiring lines
Solution Approach 1:
The patent positions power feeding lines in the thickness direction (Z-axis) between signal lines, creating a three-dimensional spatial arrangement that separates optical sensor wiring from display signal wiring. This dimensional separation effectively reduces electromagnetic noise interference while maintaining integrated device functionality
2Reliability
If power feeding lines are positioned close to optical sensors to reduce line resistance, then electrical performance is improved, but noise interference from display signal lines increases
Solution Approach 1:
The patent utilizes the thickness direction of the substrate to position power feeding lines between signal lines and optical sensors, achieving both low line resistance through optimized routing and noise reduction through spatial separation in the Z-axis dimension
Solution Approach 2:
The power feeding lines serve as an intermediary structure that physically separates signal lines from optical sensors while providing necessary electrical power, thereby reducing direct noise coupling between signal lines and sensors
3Adaptability or versatility
If multiple wiring lines are installed for display and sensor functions, then device functionality is improved, but noise interference affecting biometric detection increases
Solution Approach 1:
The patent segments wiring functions by separating display signal lines from optical sensor power and data lines in the thickness direction, with power feeding lines positioned between signal lines to create distinct electrical zones that minimize mutual interference
Solution Approach 2:
The patent resolves wiring interference by utilizing the thickness direction for vertical separation of different wiring layers, allowing multiple functional wiring lines to coexist without significant noise coupling
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 improves the accuracy of biometric information detection by reducing noise interference from display device wiring, allowing for precise fingerprint and vein pattern recognition.
Implementation Method 1
a collimating layer that blocks light inclined to the normal direction, ensuring incident light is parallel
Implementation Method 2
an optical sensor including a photoelectric conversion element that outputs a detection signal in response to light incident from the liquid crystal layer side
Data Source
AI summary
According to one embodiment, a liquid crystal display device with an optical sensor includes a first substrate, a second substrate and a liquid crystal layer. The first substrate includes first to third signal lines, an optical sensor including a photoelectric conversion element, first to third power feeding lines supplying first to third voltages to operate the optical sensor, and a sensor signal line outputting the detection signal. The first to third power feeding lines are located between the first to third signal lines and the sensor signal line in a thickness direction.