Liquid Crystal Display Veil-View Privacy Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid crystal display devices fail to ensure sufficient privacy from both left-right and oblique directions, with previous solutions either not addressing privacy from oblique directions or inadequately securing it from left-right directions.
Innovation Solution
A liquid crystal display device with a control circuit that switches between alternating and constant voltage applied to electrodes, using a matrix pattern of sub-pixels with specific electrode configurations and alignment films to control light passage and create a veil-view function, enhancing privacy by making the panel less observable from these angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid crystal display device uses a conventional electrode structure with uniform voltage application, then the device structure is simple and easy to manufacture, but the privacy protection is insufficient from both left-right and oblique directions
Solution Approach 1:
The liquid crystal display device divides the electrode structure into multiple independent electrodes (first electrode, second electrode, third electrode) with different functions. The first and second electrodes are arranged in a matrix pattern for normal display, while the third electrode is specifically designed for privacy protection by applying alternating voltage to prevent observation from oblique directions. This segmentation allows each electrode to perform its specialized function without interfering with others.
Solution Approach 2:
The patent applies alternating voltage to the third electrode at a frequency that creates periodic changes in the liquid crystal orientation. This periodic action prevents stable image formation when viewed from oblique angles, as the liquid crystal molecules continuously change their alignment, making the display content unreadable from side directions while maintaining normal viewing from the front.
2Reliability
If alternating voltage is applied to the third electrode for privacy protection from oblique directions, then privacy from oblique directions is improved, but the device requires additional voltage control circuitry
Solution Approach 1:
The third electrode serves multiple functions: it can apply alternating voltage for privacy protection from oblique directions, and can also apply constant voltage for privacy protection from left-right directions. This multi-functionality reduces the need for separate dedicated electrodes for each privacy mode, thereby reducing overall device complexity despite the added voltage control requirements.
Solution Approach 2:
The patent implements dynamic voltage control where the third electrode can switch between alternating voltage and constant voltage modes based on the desired privacy level. The control circuitry dynamically adjusts the voltage type and parameters to match the observed viewing angle and privacy requirements, optimizing performance while managing complexity through adaptive control.
3Reliability
If constant voltage is applied to the third electrode for left-right direction privacy, then privacy from left-right directions is improved, but the viewing angle range becomes restricted
Solution Approach 1:
The patent implements dynamic voltage control where the third electrode can switch between alternating voltage and constant voltage modes based on the desired privacy level. The control circuitry dynamically adjusts the voltage type and parameters to match the observed viewing angle and privacy requirements, optimizing performance while managing complexity through adaptive control.
Solution Approach 2:
The patent changes the voltage parameter (from constant to alternating or vice versa) applied to the third electrode depending on the privacy requirements. By adjusting this parameter, the system can switch between different privacy modes while maintaining adaptability to various viewing conditions, thus resolving the contradiction between privacy enhancement and viewing angle flexibility.
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 privacy by making the liquid crystal panel less visible from both left-right and oblique directions, improving contrast ratios and visibility modes, while maintaining readability from normal directions.
Implementation Method 1
voltage is applied to a liquid crystal composition sealed between paired substrates such that the alignment of liquid crystal molecules in the liquid crystal composition is changed according to the applied voltage, whereby the amount of light passing through the paired substrates is controlled
Implementation Method 2
a third electrode for generating a vertical electric field with the first electrode and the second electrode is arranged on a second substrate facing the first substrate. Here, the liquid crystal display device is meant to control the vertical electric field for viewing angle control
Implementation Method 3
display units for displaying an image using a veil-view function
Data Source
AI summary
Provided is a liquid crystal display device including: a liquid crystal panel including display units for displaying an image using a veil-view function; and a control circuit. The display units each include a pair of sub-pixels including a first sub-pixel and a second sub-pixel. The liquid crystal panel sequentially includes an active matrix substrate, a first alignment film, a liquid crystal layer containing liquid crystal molecules, a second alignment film, and a counter substrate. The active matrix substrate includes first and second electrodes that are stacked via a first insulating layer or that face each other on the first substrate. At least one of the first or second electrode is disposed for each first sub-pixel and for each second sub-pixel. The counter substrate includes a third electrode. The control circuit is configured to switch between application of alternating voltage and application of constant voltage to the third electrode.