Third Electrode Viewing Angle Switching Liquid Crystal Display
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Solution Overview
Problem
Existing liquid crystal display devices lack the ability to 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 third electrode on the first substrate that applies a periodic alternating voltage, allowing switching between wide and narrow viewing angles by controlling the electric field between substrates, without the need for a shielding film and with minimal thickness and cost increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a louver shielding film is attached to reduce viewing angle for privacy protection, then narrow viewing angle is achieved, but the device complexity increases and the viewing angle cannot be dynamically changed
Solution Approach 1:
The patent extracts the viewing angle control function from external shielding films and integrates it into the liquid crystal display system itself through a third electrode. This eliminates the need for separate louver shielding films while achieving the same privacy protection effect through electrical control of liquid crystal orientation.
Solution Approach 2:
The patent implements dynamic viewing angle control by applying different voltages to the third electrode. By varying the voltage, the liquid crystal molecules can be oriented to provide either wide or narrow viewing angles on demand, making the system adaptable rather than fixed.
2Adaptability or versatility
If a dual light source backlight system is used to switch viewing angles, then viewing angle adjustment is achieved, but the thickness and manufacturing cost increase
Solution Approach 1:
The patent makes the liquid crystal display system multi-functional by enabling it to perform both wide viewing angle display and narrow viewing angle privacy protection modes using the same liquid crystal layer and backlight system. The third electrode adds viewing angle control capability without requiring separate optical paths or additional light sources.
Solution Approach 2:
The patent changes the electrical parameters (voltage applied to the third electrode) to control the viewing angle. By adjusting the voltage level, the liquid crystal orientation changes, which dynamically adjusts the viewing angle without any mechanical or structural changes to the display device.
3Adaptability or versatility
If a dual light source backlight system is used to switch viewing angles, then viewing angle adjustment is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent merges the viewing angle control function with the existing liquid crystal display structure by adding a third electrode to the conventional common electrode and pixel electrode configuration. This integration approach allows viewing angle control to be achieved within the existing manufacturing framework without requiring separate dual backlight systems.
4Adaptability or versatility
If periodic alternating voltage with period equal to refresh period is applied, then viewing angle switching is achieved, but image sticking and split-screen mura occur
Solution Approach 1:
The patent uses periodic alternating voltage to switch between wide and narrow viewing angles. The voltage alternates between a first voltage (for wide viewing angle) and a second voltage (for narrow viewing angle) in a periodic manner, enabling dynamic viewing angle adjustment while maintaining image quality through proper timing.
Solution Approach 2:
The patent incorporates feedback control by monitoring the display frame timing and adjusting the voltage switching accordingly. The controller synchronizes the voltage transitions with the display refresh cycle, ensuring that viewing angle changes occur at appropriate moments to prevent image sticking and mura effects.
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 switching between wide and narrow viewing angles, improving image uniformity and convenience while maintaining a thin and cost-effective design, avoiding issues like split-screen mura and image sticking.
Implementation Method 1
a liquid crystal layer disposed between the first substrate and the second substrate
Implementation Method 2
A periodic alternating voltage is applied to the third electrode when the viewing angle of the liquid crystal display device is switched
Data Source
AI summary
A viewing angle switchable liquid crystal display device includes a display panel. The display panel includes a first substrate, a second substrate disposed opposite the first substrate, and a liquid crystal layer disposed between the first substrate and the second substrate. The second substrate is provided with a first electrode and a second electrode. The first electrode is a common electrode, and the second electrode is a pixel electrode. The first substrate is provided with a third electrode for controlling the switching of the viewing angle. A periodic alternating voltage is applied to the third electrode when the viewing angle of the liquid crystal display device is switched, and a period of the periodic alternating voltage is an even multiple of a refresh period of each frame of the display panel.