Flat Display Device Anti-Peeping Polarizing Plates
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Solution Overview
Problem
Current flat display devices with anti-peeping functions require additional polymer films that increase cost and thickness, which are not economically viable for restricting the viewing angle effectively.
Innovation Solution
Incorporating polarizing plates with wide view films at specific absorption axis angles to control the viewing angle, eliminating the need for additional polymer films by using polarizing plates on the light exit and entrance planes of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an additional polymer film with anti-peeping function is attached to the surface of the display device, then the viewing angle is restricted and anti-peeping function is achieved, but the cost and thickness of the display device increase
Solution Approach 1:
The patent combines the anti-peeping function with the existing polarizing plates that are already part of the display device structure. Instead of adding a separate polymer film, the invention integrates viewing angle control by configuring the absorption axes of the upper and lower polarizing plates at specific angles (15° and 105° respectively) relative to the horizontal view direction, thereby merging the anti-peeping function into the existing optical stack and avoiding additional thickness.
2Object-affected harmful factors
If an additional polymer film with anti-peeping function is attached to the surface of the display device, then the viewing angle is restricted and anti-peeping function is achieved, but the cost of the display device increases
Solution Approach 1:
The invention merges the anti-peeping function with the existing polarizing plates that are already mandatory components of the display device. By configuring the absorption axes of these existing polarizing plates at specific angles (15° for the upper plate and 105° for the lower plate), the anti-peeping function is achieved without requiring additional polymer films, thereby avoiding extra material costs and manufacturing complexity.
3Object-affected harmful factors
If the field of view is limited to provide anti-peeping function, then privacy and safety are improved, but the viewing angle for legitimate users is reduced
Solution Approach 1:
The invention applies local quality by creating different viewing characteristics in different directions. The polarizing plates are configured with specific absorption axis angles (15° and 105°) that allow users at specific viewing angles (within ±30° of the normal direction) to see the display clearly with high contrast, while effectively blocking viewers from other directions. This creates localized viewing zones that protect privacy while maintaining usability for legitimate users.
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 provides a higher contrast ratio and effectively limits the field of view, offering an anti-peeping function without the need for additional films, thus reducing cost and thickness, while maintaining user-friendly display quality.
Implementation Method 1
an upper polarizing plate disposed on a light exit plane of the flat display panel, and a lower polarizing plate disposed on a light entrance plane of the flat display panel
Data Source
AI summary
A flat display device includes a flat display panel, an upper polarizing plate disposed on a light exit plane of the flat display panel, and a lower polarizing plate disposed on a light entrance plane of the flat display panel. The upper polarizing plate includes a wide view film, and its absorption axis and a horizontal view direction of the flat display panel have an included angle of about 15 degrees. The absorption axis of the lower polarizing plate and the horizontal view direction of the flat display panel have an included angle of about 105 degrees.