Display Device Polarizer Configuration for Sensor Integration
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Solution Overview
Problem
Current liquid crystal display devices face challenges in achieving high contrast ratios across a wide wavelength band, particularly when integrating image sensors, as polarizers used for display regions are not suitable for infrared light transmission regions, leading to inadequate image quality.
Innovation Solution
The display device incorporates a configuration with separate polarizers for visible and infrared light regions, using metal wire grid polarizers to control light polarization effectively in both bands, ensuring high contrast ratios and allowing for the integration of image sensors within the display surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single polarizer is used for the entire display surface, then the display structure is simple, but the contrast ratio in infrared light transmission regions is insufficient
Solution Approach 1:
The patent applies local quality by providing different polarizer configurations in different regions of the display device. Specifically, the visible light region uses a first polarizer while the infrared light transmission region uses a second polarizer with different optical characteristics. This allows each region to have the optimal polarizer for its specific function, resolving the contradiction between structural simplicity and image quality.
2Reliability
If separate polarizers are used for visible and infrared regions, then the contrast ratio across wavelength bands is improved, but the device structure becomes more complex
Solution Approach 1:
The patent segments the display surface into distinct functional regions: a visible light region with its own polarizer configuration and an infrared light transmission region with a different polarizer configuration. This segmentation allows independent optimization of each region's optical properties, achieving high contrast ratios in both visible and infrared bands while managing overall device complexity through modular regional design.
3Reliability
If the display surface is fully utilized for imaging, then the imaging function is improved, but the display visibility is reduced due to larger frame and peripheral regions
Solution Approach 1:
The patent segments the display surface into a display region and an infrared light transmission region that overlaps with the display region. The infrared region serves dual purposes: it allows image sensor integration for imaging functions while the display region maintains full visibility. This spatial segmentation enables both imaging and display functions to operate simultaneously without compromising either 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
This configuration enables a display device with high display quality and high contrast ratios across a wide wavelength band, allowing for the effective integration of image sensors without compromising image quality.
Implementation Method 1
The first substrate includes a first polarizer provided on the second surface and a second polarizer being overlapped with the second region and being laminated with the first polarizer. The second substrate includes a third polarizer provided on the fourth surface and a fourth polarizer being overlapped with the second region and being laminated with the third polarizer.
Data Source
AI summary
A display device includes a first substrate including a first surface and a second surface on the opposite side with respect to the first surface, a second surface having a third surface opposite the first surface and a fourth surface on the opposite side with respect to the third surface, and a liquid crystal layer disposed between the first substrate and the second substrate, the display device includes a first region and a second region in a plan view, the first substrate includes a first polarizer provided on the second surface and a second polarizer being overlapped with the second region and being laminated with the first polarizer, and the second substrate includes a third polarizer provided on the fourth surface and a fourth polarizer being overlapped with the second region and being laminated with the third polarizer.