Polarizing Plate with Wavelength-Selective Absorbance for Camera Integration
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Solution Overview
Problem
Conventional polarizing plates used in optical display devices with image sensors, such as cameras, face limitations in maintaining image quality and durability, especially when the image sensor is integrated into the display region, leading to visual observation issues and reduced image resolution.
Innovation Solution
A polarizing plate with distinct first and second regions, where the first region has a total transmittance of 45% to 85% and specific absorbance characteristics across different wavelength ranges, and the second region has lower absorbance in certain ranges, to minimize visual observation of the image sensor while enhancing image resolution and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If physical punching method is used to create space for image sensor, then space for image sensor is secured, but cracks occur in the punched region causing poor image quality
Solution Approach 1:
The patent replaces the mechanical punching method with a chemical etching process using a photoresist pattern and etching solution. This substitution eliminates mechanical stress and cracking while creating the necessary space for the image sensor, thereby maintaining image quality in the surrounding regions.
Solution Approach 2:
The patent introduces a photoresist layer as an intermediary material to define the pattern for the image sensor region. This photoresist acts as a mask during chemical etching, allowing precise formation of the sensor region without direct mechanical contact with the polarizing plate, thus preventing cracks.
2Adaptability or versatility
If image sensor is integrated into the display region, then image display function is maintained, but visual observation of image sensor becomes possible reducing privacy
Solution Approach 1:
The patent applies different optical properties to different regions of the polarizing plate. The image sensor region has specific transmittance characteristics that allow sensor operation, while the surrounding display region maintains normal polarizing properties. This local differentiation enables the display function to be preserved while controlling visual observation of the sensor.
Solution Approach 2:
The patent utilizes wavelength-dependent transmittance characteristics, where the polarizing plate exhibits different optical properties at different wavelengths. By controlling the transmittance in specific wavelength ranges, the plate allows the image sensor to function while making the sensor region visually imperceptible or appearing uniform with the display region.
3Ease of manufacture
If typical polarizing plate is used, then manufacturing is simple, but it cannot suppress visual observation of image sensor while maintaining image display function
Solution Approach 1:
The patent modifies the optical parameters of the polarizing plate by controlling the transmittance characteristics in specific wavelength ranges. By adjusting these parameters during the manufacturing process, the plate achieves dual functionality: maintaining image display performance while suppressing visual observation of the image sensor, all within an existing manufacturing framework.
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 effectively suppresses visual observation of the image sensor, increases image resolution, and provides improved durability under high temperature and humidity conditions, ensuring efficient image display and photographing functions.
Implementation Method 1
the first region has a maximum absorbance of 1.0 to 5.0 in the wavelength range of about 270 nm to about 325 nm, a maximum absorbance of 0.5 to 4.0 in the wavelength range of greater than about 325 nm to about 420 nm
Data Source
AI summary
Provided are a polarizing plate and an optical display device comprising same, the polarizing plate comprising a polarizer and a protective layer formed on at least one surface of the polarizer, wherein: the polarizing plate comprises a first area and a second area formed within an image display area; the first area and the second area have different single transmittances in the same wavelength; and the first area has a single transmittance of 45% to 85%, a maximum absorbance of 1.0 to 5.0 in a wavelength in a range from about 270 nm to about 325 nm, a maximum absorbance of 0.5 to 4.0 in a wavelength which exceeds about 325 nm and is lower than or equal to 420 nm, and a maximum absorbance of 0.5 or less in a wavelength in a range from about 500 nm to about 800 nm.