Switchable Viewing Angle Panel for Privacy and Share Displays
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Solution Overview
Problem
Existing display devices face challenges in providing a switchable viewing angle that can seamlessly transition between privacy and wide-viewing-angle modes without degrading image quality or increasing power consumption.
Innovation Solution
A display device with a viewing angle control panel comprising polarizing plates and a liquid crystal layer that adjusts the polarized light transmission based on electrode voltage, allowing for a switchable viewing angle mode without additional power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device implements both wide-viewing-angle mode and narrow-viewing-angle mode in different areas, then the viewing angle flexibility is improved, but the display quality is degraded due to heterogeneity in the boundary area
Solution Approach 1:
The patent applies local quality by configuring different viewing angle control characteristics in different areas of the display panel. The boundary area has a different viewing angle control panel configuration compared to the central area, allowing each region to be optimized for its specific function while reducing visible heterogeneity. This enables the display to provide both wide viewing angle capability and privacy protection without significant quality degradation at boundaries.
2Reliability
If the viewing angle control panel blocks polarized light completely in privacy mode, then the privacy protection is improved, but the luminance decreases
Solution Approach 1:
The patent applies parameter changes by controlling the degree of polarized light blocking dynamically. Instead of complete blocking, the viewing angle control panel adjusts the blocking level based on the operating mode and viewing angle. In privacy mode, the panel blocks a portion of polarized light to achieve privacy protection while maintaining acceptable luminance. The control panel can adjust the blocking parameter to balance privacy and brightness requirements.
3Device complexity
If the display device uses a fixed viewing angle control configuration, then the device complexity is reduced, but the adaptability to different viewing scenarios is limited
Solution Approach 1:
The patent applies dynamics by making the viewing angle control panel configuration adjustable rather than fixed. The display device can switch between different viewing angle control modes (privacy mode and wide-viewing-angle mode) based on the operational requirements. The viewing angle control panel can dynamically adjust its characteristics to match the desired viewing scenario, providing adaptability without requiring completely separate physical systems.
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 device achieves improved luminance and efficient switching between privacy and share modes by controlling polarized light transmission, enhancing image quality and process performance.
Implementation Method 1
the viewing angle control panel comprises: a first polarizing plate; a viewing angle control layer disposed on the first polarizing plate; and a second polarizing plate disposed on the viewing angle control layer and having a transmission axis perpendicular to a transmission axis of the first polarizing plate
Implementation Method 2
controlling the polarized light transmitting into the display area
Data Source
AI summary
A display device having a switchable viewing angle in one example includes a display panel having a display area and a non-display area around the display area. The display area can include a viewing angle control area in which the display device is operated to be switched between a viewing angle control mode and a share mode, a share area in which the display device is operated in the share mode, and a boundary area disposed between the viewing angle control area and the share area and in which the display device is operated to be switched between the viewing angle control mode and the share mode. The display device can further include a viewing angle control panel disposed below the display panel and configured to selectively control the operating mode of the display device by controlling a polarized light transmitting into the display area.