Liquid Crystal Display Veil-View Mode via Segmented Counter Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display devices face challenges in achieving sufficient transmittance and contrast ratio, as well as ensuring privacy from oblique directions, particularly in wide viewing angle ranges.
Innovation Solution
A liquid crystal display device that switches display modes by adjusting voltages applied to electrodes on the counter substrate, incorporating a veil-view function to control viewing angles and ensure privacy, with a configuration including sub-pixels, active matrix substrates, alignment films, and counter substrates with specific electrode arrangements and voltage control circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liquid crystal display device uses a conventional electrode structure to achieve wide viewing angle, then the viewing angle range is improved, but the transmittance and contrast ratio deteriorate
Solution Approach 1:
The counter substrate electrode is segmented into multiple independent electrode portions (first electrode portion, second electrode portion, third electrode portion, fourth electrode portion) arranged in a specific pattern. This segmentation allows independent voltage control of each electrode portion, enabling selective application of voltages to different regions to achieve both wide viewing angle and high transmittance/contrast ratio simultaneously
Solution Approach 2:
The display device dynamically switches between different display modes (first display mode, second display mode, third display mode) by applying different voltage patterns to the segmented electrodes. In the first display mode, voltages are applied to achieve wide viewing angle; in the second display mode, voltages are adjusted to optimize transmittance and contrast ratio. This dynamic voltage control resolves the contradiction between viewing angle and optical performance
2Adaptability or versatility
If a liquid crystal display device allows observation in wide viewing angle range, then the adaptability is improved, but the privacy protection deteriorates
Solution Approach 1:
The display device dynamically switches between a first display mode (wide viewing angle) and a second display mode (narrow viewing angle for privacy). The control circuit applies different voltage patterns to the segmented electrodes to switch modes. In the first display mode, the entire electrode structure is activated for wide viewing. In the second display mode, specific electrode portions are activated to create a narrower viewing angle, preventing observation from oblique directions and ensuring privacy
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 device effectively switches between narrow and wide viewing angle modes, ensuring privacy from oblique directions by adjusting electrode voltages and utilizing the veil-view function, enhancing privacy and image visibility as needed.
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
generates a horizontal electric field between a first electrode and a second electrode disposed on a first substrate
Implementation Method 3
a third electrode for generating a vertical electric field with the first electrode and the second electrode
Data Source
AI summary
Provided is a liquid crystal display device including: an active matrix substrate including a first substrate, and a first electrode and a second electrode that are stacked via a first insulating layer or that face each other on the first substrate, the second electrode being disposed for each sub-pixel; and a counter substrate sequentially including a second substrate, a third electrode including linear electrode portions, a second insulating layer, and a fourth electrode including linear electrode portions, an extending direction of the linear electrode portions of the third electrode intersecting an extending direction of the linear electrode portions of the fourth electrode in a plan view; and a control circuit being configured to switch between application of an alternating voltage and application of a constant voltage to the third electrode and/or the fourth electrode.