LCD Optical Sensor Wiring for Narrow-Frame Biometric Sensing
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Solution Overview
Problem
There is a demand for liquid crystal display devices with built-in optical sensors to have a narrow frame while maintaining effective biometric information detection capabilities.
Innovation Solution
The integration of a collimating layer and optical sensors within the display device to parallelize incident light, combined with a driver IC for signal processing, allows for accurate biometric detection without increasing the frame size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical sensors and collimating layers are integrated into the display device, then biometric detection capability is improved, but frame size increases
Solution Approach 1:
The patent combines the optical sensor and collimating layer functions within the existing display device structure, merging multiple functions (display and biometric detection) into a single integrated system. This allows biometric detection capability to be added without significantly increasing overall frame size, as the components share the same physical space and structural framework.
Solution Approach 2:
The display device is designed to perform multiple functions: traditional display operation and biometric information detection. The optical sensor system is integrated into the display structure, enabling the device to serve both as a display medium and a biometric authentication tool, thereby improving adaptability without proportionally increasing frame size.
2Length of stationary object
If a narrow frame design is implemented, then design aesthetics and compactness are improved, but space for optical sensors is reduced
Solution Approach 1:
The patent utilizes the vertical dimension and layered structure of the display device to accommodate optical sensors. By arranging components in multiple layers (with the collimating layer positioned between the light source and liquid crystal layer), the design maintains a narrow frame while providing sufficient space for sensor integration through three-dimensional spatial arrangement.
Solution Approach 2:
The optical sensor components are nested within the existing display device structure. The collimating layer is positioned between the light source and liquid crystal layer, effectively nesting the sensing function within the display's internal architecture. This nested arrangement allows both functions to coexist in a compact form factor.
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 enables accurate detection of biometric information such as fingerprints and vein patterns with a narrow frame, enhancing the functionality of liquid crystal displays without compromising their design aesthetics.
Implementation Method 1
Optical sensors using, for example, photoelectric conversion elements are used as this type of sensor. Optical sensors detect biometric information of an object by detecting light emitted from a light source such as a backlight and reflected by the object.
Implementation Method 2
The integration of a collimating layer and optical sensors within the display device to parallelize incident light
Data Source
AI summary
According to one embodiment, a liquid crystal display device with an optical sensor includes a display panel and a driver IC. The display panel includes first to third signal lines, an optical sensor including a photoelectric conversion element, and a sensor signal line that is connected to the optical sensor and transmits a detection signal to the driver IC. One first wiring line drawn from one terminal of the driver IC is connected to four switching elements. Three of the four switching elements are electrically connected to one of the first to third signal lines, respectively. One of the four switching elements, different from the three switching elements, is electrically connected to the sensor signal line.