Display Apparatus With Dual-Direction Privacy Viewing Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display apparatuses with wide viewing angles compromise privacy by allowing unauthorized viewing, and configurations like light control films and electrically-controlled diffusion sheets reduce brightness and increase power consumption, failing to meet privacy protection requirements in multiple directions.
Innovation Solution
A display apparatus with a self-luminous panel and stacked electrically-controlled viewing angle switching devices and polarizers, including alignment layers and liquid-crystal layers, allows for adjustable privacy protection modes without significant brightness loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a light control film and electrically-controlled diffusion sheet are installed to achieve privacy protection, then privacy protection effect is improved, but overall brightness is reduced and operating power consumption increases
Solution Approach 1:
The privacy protection function is segmented into two independent electrically-controlled viewing angle switching devices with different control directions. The first device controls viewing angle in a first direction, while the second device controls viewing angle in a second direction perpendicular to the first direction. This segmentation allows selective activation of only the necessary privacy protection mode, avoiding the need to always use both light control film and diffusion sheet together, thereby maintaining brightness when full privacy protection is not required.
Solution Approach 2:
The system dynamically switches between different privacy protection modes by electrically controlling the liquid crystal layers. The viewing angle control is dynamic and adjustable, allowing the display to transition between wide viewing angle mode and narrow viewing angle mode based on real-time needs. This dynamic control eliminates the need for fixed light control films that permanently reduce brightness.
2Loss of information
If light control film and electrically-controlled diffusion sheet are installed to achieve privacy protection, then privacy protection effect is improved, but operating power consumption increases
Solution Approach 1:
The electrically-controlled liquid crystal viewing angle switching devices consume power only when switching between modes or maintaining specific viewing angle states. When in wide viewing angle mode, the devices can be in a relaxed state with minimal power consumption. This dynamic power management is more efficient than continuously powered light control films that must maintain their privacy protection function at all times.
Solution Approach 2:
The system can discard the privacy protection function when not needed, allowing the liquid crystal layers to return to their initial state with minimal energy maintenance. This is more energy-efficient than light control films that require continuous power to maintain their optical properties.
3Loss of information
If conventional light control film is used to achieve privacy protection, then single-sided privacy protection is achieved, but dual-sided privacy protection requirement cannot be met
Solution Approach 1:
The privacy protection capability is segmented into two perpendicular control directions using two separate electrically-controlled viewing angle switching devices. The first device provides privacy protection in the first direction (e.g., horizontal), while the second device provides privacy protection in the second direction (e.g., vertical). This allows independent control of privacy protection in each direction, enabling both single-sided and dual-sided privacy protection modes as needed.
Solution Approach 2:
The dual-device configuration provides universal privacy protection capability that can adapt to various usage scenarios. The system can function as single-sided privacy protection by activating only one device, or as dual-sided privacy protection by activating both devices simultaneously. This multi-functional design meets diverse privacy protection requirements without needing different hardware configurations.
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 apparatus provides enhanced privacy protection in various scenarios by enabling single-sided or dual-sided viewing angle control, improving safety and reducing power consumption.
Implementation Method 1
The first liquid-crystal layer is disposed between the first alignment layer and the second alignment layer. The second liquid-crystal layer is disposed between the third alignment layer and the fourth alignment layer.
Implementation Method 2
The first polarizer is disposed at a side of the first electrically-controlled viewing angle switching device facing away from the second electrically-controlled viewing angle switching device, and has a first absorption axis. The second polarizer is disposed between the first electrically-controlled viewing angle switching device and the second electrically-controlled viewing angle switching device, and has a second absorption axis. The third polarizer is disposed between the self-luminous display panel and the second electrically-controlled viewing angle switching device and has a third absorption axis.
Data Source
AI summary
A display apparatus including a self-luminous display panel and a third polarizer, a second electrically-controlled viewing angle switching device, a second polarizer, a first electrically-controlled viewing angle switching device, and a first polarizer sequentially stacked on a display surface of the self-luminous display panel is provided. The first switching device includes a first liquid-crystal layer and first and second alignment layers. The first alignment layer is located between the first liquid-crystal layer and the first polarizer. A first absorption axis of the first polarizer is parallel or perpendicular to a first alignment direction of the first alignment layer. The second switching device includes a second liquid-crystal layer and third and fourth alignment layers. The fourth alignment layer is located between the second liquid-crystal layer and the third polarizer. A third absorption axis of the third polarizer is parallel or perpendicular to a fourth alignment direction of the fourth alignment layer.