Segmented Polarizing Plate for Display and Image Sensor Reliability
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Solution Overview
Problem
Existing polarizing plates in optical display apparatuses face issues with image quality degradation due to cracking from physical punching, difficulty in machining, and reliability loss at high temperatures, especially when used with image sensors.
Innovation Solution
A polarizing plate design with distinct first and second regions, each with different light transmittance and moisture content, ensuring reliable image display and external image-capturing functions, even at high temperatures, by using a protective layer and cover glass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If physical punching method is used to create a region for the image sensor, then a space for the image sensor is secured, but cracks occur in the region around the punched region causing poor image quality
Solution Approach 1:
The polarizing plate is divided into a first region (image display region) and a second region (non-image display region for image sensor placement). This segmentation allows the image sensor to be positioned in the second region without requiring physical punching through the entire plate, thereby avoiding cracks while still providing access to the sensor.
Solution Approach 2:
Different regions of the polarizing plate are given different optical properties. The first region maintains full polarizing function for image display, while the second region has modified properties to allow image sensor operation. This local differentiation enables the coexistence of display functionality and sensor access without compromising overall image quality.
2Ease of manufacture
If the polarizing plate is bonded to cover glass using pressure sensitive adhesive or optically clear adhesive, then the polarizing plate is secured in place, but reliability deteriorates when left at high temperature for a long period of time
Solution Approach 1:
The patent specifies precise control of moisture content (0.5-3.0 g/m²) and light transmittance parameters of the polarizing plate to optimize its thermal stability. By controlling these physical parameters, the plate maintains its bonding integrity and optical performance even after prolonged exposure to high temperatures, resolving the reliability issue with adhesive bonding.
3Adaptability or versatility
If a region of the polarizing plate is made transparent for image sensor operation, then external image photographing function is enabled, but the region cannot provide clear image during photographing
Solution Approach 1:
The polarizing plate is segmented into a first region for clear image display and a second region with different optical properties for image sensor access. This segmentation allows the system to simultaneously achieve both clear display functionality and external image photographing capability without compromising image clarity in either region.
Solution Approach 2:
The second region is given specific optical properties (different light transmittance and moisture content) that enable it to function as an optical path for the image sensor while maintaining sufficient image quality. This local optimization allows clear imaging during photographing while enabling the photographing function itself.
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 polarizing plate maintains image quality and functionality, including external image-capturing, with minimal transmittance variation, even after prolonged exposure to high temperatures, by employing a first region with 50-80% light transmittance and a second region with 40-50% transmittance, and a moisture content of 2.0 g/m2 or less.
Implementation Method 1
the polarizing plate includes a first region and a second region having a lower light transmittance than the first region
Implementation Method 2
the second region has a moisture content of 2.0 g/m2 or less
Data Source
AI summary
A polarizing plate and an optical display apparatus including the same are provided. A polarizing plate includes: a polarizer; and a protective layer on at least one surface of the polarizer, and the polarizing plate includes a first region and a second region having a lower light transmittance than the first region and has a moisture content of 2.0 g/m2 or less.