Switchable Viewing Angle Liquid Crystal Display via Voltage Control
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Solution Overview
Problem
Existing liquid crystal display devices lack the ability to easily switch between wide and narrow viewing angles without using a shielding film, which is inconvenient, and dual light source backlight systems increase thickness and cost, contradicting the trend of thin and light displays.
Innovation Solution
A liquid crystal display device with a display control module and a viewing angle control module that applies a periodic alternating voltage to the first electrode, allowing users to switch between wide and narrow viewing angles through a synchronization signal, without the need for a shielding film and without increasing product thickness or manufacturing cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a louver shielding film is attached on the screen to reduce the viewing angle for privacy protection, then the viewing angle is restricted to a narrow range, but the viewing angle cannot be changed according to user needs and the user convenience is reduced
Solution Approach 1:
The patent applies the dynamics principle by making the viewing angle adjustable rather than fixed. Through voltage control of the liquid crystal molecules, the display can dynamically switch between wide viewing angle mode (for entertainment) and narrow viewing angle mode (for privacy protection), allowing the viewing angle to adapt to different user needs rather than being static like a louver shielding film
Solution Approach 2:
The patent changes the physical state parameter of the liquid crystal molecules by applying different voltages. By controlling the voltage applied to the liquid crystal layer, the molecules can be oriented in different directions, thereby changing the viewing angle characteristic of the display from wide to narrow without any mechanical components or additional films
2Adaptability or versatility
If a dual light source backlight system is used to adjust the viewing angle, then the viewing angle can be switched between wide and narrow modes, but the thickness and manufacturing cost of the display device increase
Solution Approach 1:
The patent replaces the mechanical/optical system of a dual light source backlight system with an electrical control system. Instead of using two separate light guide plates and anti-prism sheets to achieve viewing angle switching, the invention uses voltage control to manipulate liquid crystal molecules, thereby achieving the same functionality with a simpler, thinner structure that reduces both thickness and manufacturing complexity
Solution Approach 2:
The patent extracts the viewing angle control function from the backlight system and integrates it into the liquid crystal layer control. By removing the need for separate light guide plates and anti-prism sheets, the design simplifies the overall structure and eliminates the thickness penalty associated with dual light source systems
3Adaptability or versatility
If a dual light source backlight system is used to adjust the viewing angle, then the viewing angle can be switched between wide and narrow modes, but the manufacturing cost of the display device increases
Solution Approach 1:
The patent replaces the complex mechanical assembly of a dual light source backlight system with a simple electrical control approach. By using voltage control of liquid crystal molecules instead of physical light guide components, the manufacturing process is simplified, reducing both material costs and assembly complexity while maintaining viewing angle switching capability
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
Enables flexible and convenient switching between wide and narrow viewing angles, eliminating issues like flicker and mura, while maintaining the advantages of entertainment use and privacy protection without additional components or cost.
Implementation Method 1
the liquid crystal display device further includes a viewing angle control module, and the display control module is further used to provide a synchronization signal to the viewing angle control module. According to the synchronization signal, when a next frame following a current frame on which a viewing angle switching signal is received starts to display, the viewing angle control module outputs a periodic alternating voltage for switching viewing angle to the first electrode
Data Source
AI summary
A liquid crystal display device having switchable viewing angles includes a display panel and a display control module. The display panel includes a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrate. The display control module is used for controlling the display panel to display images. The first substrate is provided with a first electrode. The second substrate is provided with a second electrode and a third electrode. The liquid crystal display device further includes a viewing angle control module. The display control module is further used to provide a synchronization signal to the viewing angle control module. According to the synchronization signal, when a next frame following a current frame on which a viewing angle switching signal is received starts to display, the viewing angle control module outputs a periodic alternating voltage for switching viewing angle to the first electrode.