Privacy Display Polarizer Layout for Uniform Viewing Brightness
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Solution Overview
Problem
Existing display technologies suffer from a significant discrepancy in brightness between privacy and share modes, which adversely affects the display performance.
Innovation Solution
A display apparatus with a switching mechanism that includes a display panel, a switching panel, a first polarizer, and a second polarizer, where the absorption axis of the first polarizer is perpendicular to the vertical direction and the absorption axis of the second polarizer is parallel to the vertical direction, and the solution is designed to minimize the brightness difference between the large vertical viewing angles and the front viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a collimated backlight module and switching panel are used to achieve privacy mode, then anti-peep performance is improved, but brightness uniformity between large vertical viewing angles and front viewing angle deteriorates
Solution Approach 1:
The patent changes the optical parameters by introducing a second polarizer with specific absorption axis orientation (parallel to vertical direction) and adjusting the liquid crystal layer characteristics. This modifies the polarization state transformation to achieve both anti-peep performance and brightness uniformity across different viewing angles.
Solution Approach 2:
The patent uses a composite optical system combining multiple polarizers with specific absorption axis orientations and liquid crystal materials. The first polarizer has absorption axis perpendicular to vertical direction, while the second polarizer has absorption axis parallel to vertical direction, creating a composite polarization control mechanism that resolves the brightness discrepancy.
2Adaptability or versatility
If switching panel is used to switch between privacy mode and share mode, then functionality is improved, but brightness discrepancy between different viewing angles worsens
Solution Approach 1:
The patent employs a dynamic switching mechanism using voltage-controlled liquid crystal orientation. By applying voltage between electrodes, the liquid crystal molecules rotate to change polarization state, enabling dynamic switching between privacy mode (high voltage, horizontal polarization) and share mode (low voltage, vertical polarization), while maintaining brightness uniformity.
Solution Approach 2:
The patent changes the polarization state parameter through voltage control of the liquid crystal layer. In privacy mode, high voltage orientes liquid crystal molecules horizontally; in share mode, low voltage allows vertical orientation. This parameter change enables functionality switching while the second polarizer compensates to maintain brightness uniformity.
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 brightness difference between the large vertical viewing angles and the front viewing angle is minimized by using a switching mechanism that includes a display panel, a switching panel, a first polarizer, and a second polarizer, where the absorption axis of the first polarizer is perpendicular to the vertical direction, and the absorption axis of the second polarizer is parallel to the vertical direction, and the absorption axis of the absorption axis of the second polarizer is parallel to the vertical direction, and the absorption axis of the second polarizer is parallel to the vertical direction.
Implementation Method 1
The switching panel includes a liquid crystal layer disposed between the first substrate and the second substrate. The liquid crystal layer is responsive to a potential difference between the first electrode and the second electrode.
Implementation Method 2
An absorption axis of the first polarizer is substantially perpendicular to the vertical direction. An absorption axis of the second polarizer is substantially parallel to the vertical direction.
Data Source
AI summary
A display apparatus includes a display panel, a switching panel, a first polarizer and a second polarizer. The switching panel includes a first substrate, a second substrate, a liquid crystal layer, a first electrode and a second electrode. At least one of the first electrode and the second electrode is disposed on the first substrate. The display panel, the first polarizer, the switching panel and the second polarizer are stacked sequentially in a vertical direction. An absorption axis of the first polarizer is substantially perpendicular to the vertical direction. An absorption axis of the second polarizer is substantially parallel to the vertical direction.