Switchable Viewing Angle Display Panel with Liquid Crystal Control
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Solution Overview
Problem
Existing display technologies face challenges in achieving a strong anti-peeping effect at large viewing angles when in the narrow viewing angle mode, due to grayscale reversal issues.
Innovation Solution
A display panel with switchable wide and narrow viewing angles is implemented, utilizing a light adjusting box with a first substrate, a second substrate, and a liquid crystal layer. The panel includes viewing angle electrodes on the substrates, and a driving method that applies specific electrical signals to these electrodes to control the liquid crystal's deflection, thereby switching between viewing angles and mitigating grayscale reversal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a louver shielding film is attached to the display screen to reduce viewing angle for privacy protection, then the anti-peeping effect is improved, but the brightness and display effect are reduced, and the viewing angle cannot be switched freely
Solution Approach 1:
The patent applies a dynamic liquid crystal layer instead of a static louver shielding film. The liquid crystal molecules can be controlled to change their orientation through applied voltage, dynamically switching between wide viewing angle mode (horizontal alignment) and narrow viewing angle mode (vertical alignment), providing adaptability while maintaining good display效果和亮度
Solution Approach 2:
The patent changes the physical state parameters of the liquid crystal layer by applying different voltages. In wide viewing angle mode, the voltage is set to allow horizontal molecular alignment for broad light transmission. In narrow viewing angle mode, a specific voltage range (1.2V-3.0V) is applied to induce vertical molecular alignment, reducing the viewing angle to ±30° while maintaining acceptable brightness and display quality
2Object-affected harmful factors
If voltage is applied to viewing angle control electrodes to achieve narrow viewing angle mode, then the anti-peeping effect is improved, but grayscale reversal occurs at large viewing angles, resulting in poor anti-peeping performance
Solution Approach 1:
The patent introduces separate first and second viewing angle control electrodes that can be independently controlled. This allows different voltage signals to be applied to different regions of the liquid crystal layer, creating local quality differences. By independently adjusting the voltage on each electrode, the system can optimize the liquid crystal orientation to prevent grayscale reversal at large viewing angles while maintaining narrow viewing angle anti-peeping effect
Solution Approach 2:
The patent implements a control mechanism that monitors the display quality and viewing angle, and adjusts the voltage signals accordingly. When grayscale reversal is detected at large viewing angles, the control system adjusts the voltage on the viewing angle control electrodes to re-optimize the liquid crystal orientation, ensuring reliable anti-peeping performance across different viewing conditions
3Object-affected harmful factors
If a louver shielding film is used to switch between wide and narrow viewing angles, then the viewing angle can be controlled, but additional preparation is required and the film can only achieve one viewing angle, making free switching impossible
Solution Approach 1:
The patent uses a dynamic liquid crystal system instead of a static louver shielding film. The liquid crystal molecules can be electrically controlled to switch between horizontal and vertical alignment states, enabling free switching between wide and narrow viewing angle modes without any physical preparation or attachment. The system can transition between modes instantly through voltage control
Solution Approach 2:
The patent integrates multiple functions into a single liquid crystal layer system. The same liquid crystal layer serves both as the display medium and as the viewing angle control mechanism. By applying different voltage patterns to the common electrode and viewing angle control electrodes, the system can achieve wide viewing angle mode, narrow viewing angle mode, and intermediate states, providing universal adaptability for different usage 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 effectively enhances the anti-peeping effect at large viewing angles by ensuring the displayed picture remains unreadable, even in cases of grayscale reversal, through the periodic change in brightness of the graphic regions.
Implementation Method 1
The viewing angle control electrodes provided on the first substrate and the second substrate generate a vertical electric field on the liquid crystal molecules, so that the liquid crystal molecules deflect in a vertical direction
Implementation Method 2
the liquid crystal molecules deflect in a vertical direction, thereby realizing the narrow viewing angle
Implementation Method 3
the amplitude of the third electrical signal periodically changes, such that the transmittance of the first graphic region from the same side viewing angle periodically changes
Data Source
AI summary
Disclosed are a display panel having switchable wide and narrow viewing angles and a driving method, and a display device. The display panel has a first graphic region and a second graphic region that are patterned; the display panel comprises a light adjusting box and a display box stacked on each other; the light adjusting box comprises a first substrate, a second substrate, and a first liquid crystal layer; the first substrate is provided with a common viewing angle electrode; the second substrate is provided with a first viewing angle electrode and a second viewing angle electrode working in conjunction with the common viewing angle electrode; the first viewing angle electrode corresponds to the first graphic region; the second viewing angle electrode corresponds to the second graphic region.