Polarizer and Backplate Sensor Layout for Narrow-Bezel Displays
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Solution Overview
Problem
Conventional display devices face limitations in achieving narrow bezel designs due to the physical dimensions of sensors incorporated within peripheral regions.
Innovation Solution
A display device design that includes a display panel with overlapping first and second polarizing plates and a sensor positioned on a backplate, allowing for a narrow bezel configuration by minimizing the visibility of the sensor through controlled light transmission and alignment of polarizing plates and liquid crystal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are incorporated within peripheral regions of display devices, then image sensing function is achieved, but bezel width increases
Solution Approach 1:
The patent moves the sensor from the peripheral region (2D plane) to the backplate layer (3D depth dimension), allowing the sensor to be positioned behind the display panel rather than at the edges. This dimensional transition enables the sensor to overlap with the display region in the thickness direction, achieving image sensing without increasing bezel width.
Solution Approach 2:
The sensor is nested within the layered structure of the display device, specifically positioned on the backplate behind the display panel. This nesting arrangement allows the sensor to be integrated into the existing device structure without occupying additional peripheral space, thereby maintaining narrow bezel design while preserving sensing functionality.
2Length of stationary object
If sensor is positioned to overlap display region, then narrow bezel design is achieved, but sensor visibility increases
Solution Approach 1:
The patent applies different optical properties to different regions of the display panel. The display region maintains its normal optical characteristics for visual output, while the region overlapping the sensor is configured with specific polarizing plate arrangements and liquid crystal layer orientations that control light transmission to mask the sensor's presence, making it invisible or less visible to users.
Solution Approach 2:
The patent utilizes polarization and light transmission control to effectively 'change the optical appearance' of the sensor region. By adjusting the orientation of polarizing plates and liquid crystal layers, the sensor region can be made optically similar to the surrounding display area, reducing its visibility while maintaining its sensing function.
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
Enables a narrow bezel or bezel-less design while maintaining effective image sensing capabilities by reducing the visibility of the sensor and optimizing light transmission for both visible and non-visible light.
Implementation Method 1
The display panel includes a first polarizing plate and a second polarizing plate. The first polarizing plate is disposed in the display region. The second polarizing plate is disposed in the display region.
Implementation Method 2
controlled light transmission and alignment of polarizing plates and liquid crystal layers
Data Source
AI summary
A display device has a display region and a peripheral region. The display device includes a display panel, a backplate, and a sensor. The display panel includes a first polarizing plate and a second polarizing plate. The first polarizing plate is disposed in the display region. The second polarizing plate is disposed in the display region. The backplate overlaps the display panel. The sensor is disposed on the backplate and overlaps the first polarizing plate and the second polarizing plate that are located in the display region.