Switchable Viewing Angle Display With LC Privacy and Share Modes
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Solution Overview
Problem
Existing display devices lack a switchable viewing angle feature that can seamlessly transition between a privacy mode and a share mode without increasing power consumption, and there is a need for improved switching speed and efficiency in image quality.
Innovation Solution
The implementation of a display device with a first polarizer, a viewing angle control panel containing a lower and upper electrode, and liquid crystal layers to selectively change light polarization, along with additional polarizers and substrates to control light paths, utilizing twisted nematic liquid crystals for fast response and incorporating a pixel lens for enhanced efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a viewing angle control panel with liquid crystal layer is used to switch between privacy mode and share mode, then the viewing angle can be controlled, but the luminance decreases and power consumption increases
Solution Approach 1:
The viewing angle control panel is divided into multiple independent pixel regions, each with its own liquid crystal layer and electrode structure. This segmentation allows selective activation of specific pixel groups for different viewing angle modes, reducing overall power consumption while maintaining luminance in active regions.
Solution Approach 2:
The liquid crystal layer is configured to dynamically change its molecular orientation in response to applied voltage, enabling real-time switching between privacy mode (narrow viewing angle) and share mode (wide viewing angle). This dynamic response allows rapid mode transitions without residual effects, maintaining image quality and luminance stability.
2Adaptability or versatility
If a viewing angle control panel with liquid crystal layer is used to switch between privacy mode and share mode, then the viewing angle can be controlled, but the switching speed between modes is slow
Solution Approach 1:
The liquid crystal material parameters are optimized by selecting specific compounds with faster response characteristics. The molecular structure and viscosity parameters are adjusted to reduce relaxation time, enabling the liquid crystal layer to switch states more rapidly between privacy and share modes, thereby improving overall switching speed.
3Adaptability or versatility
If a viewing angle control panel with liquid crystal layer is used to switch between privacy mode and share mode, then the viewing angle can be controlled, but the efficiency and fairness are reduced
Solution Approach 1:
The pixel array is segmented into multiple independently controllable groups, allowing selective activation based on viewing angle requirements. This segmentation improves efficiency by activating only the necessary pixel regions rather than the entire panel, reducing unnecessary power consumption and enhancing operational fairness across different viewing scenarios.
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 solution provides a display device with improved luminance and switching speed between privacy and share modes without increased power consumption, and enhances efficiency and fairness through the use of a pixel lens.
Implementation Method 1
a liquid crystal layer disposed between the lower electrode and the upper electrode to selectively change the light of P-wave or S-wave to an S-wave or P-wave
Implementation Method 2
a first polarizer which transmits light of a P-wave or S-wave
Data Source
AI summary
A display device having a switchable viewing angle includes a first polarizer which transmits light of a P-wave or S-wave, a viewing angle control panel which is disposed above the first polarizer, includes a lower electrode and an upper electrode, and a liquid crystal layer disposed between the lower electrode and the upper electrode to selectively change the light of P-wave or S-wave to an S-wave or P-wave, and a second polarizer which is disposed above the viewing angle control panel and has a transmission axis perpendicular to a transmission axis of the first polarizer. Therefore, the mode may be switchable to the privacy mode and the share mode and in the share mode, the luminance may be improved without increasing the power consumption.