LCD Sub-Pixel Electrode Segmentation for Viewing Angle Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid crystal display (LCD) devices with wide viewing angles complicate the fabrication process and increase power consumption when using filters to adjust the viewing angle, which is undesirable for applications requiring a narrow viewing angle, such as internet banking or automatic teller machines.
Innovation Solution
An LCD device with a specific configuration of sub-pixel regions and electrode structures that allow for adjustable viewing angles without the use of filters, utilizing a combination of horizontal and vertical electric fields to control liquid crystal alignment and restrict the viewing angle, thereby reducing power consumption and fabrication complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If filters are used to adjust the viewing angle of LCD devices, then the viewing angle can be controlled, but the fabrication process becomes complicated and power consumption increases
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode segment, second pixel electrode segment, third pixel electrode segment) arranged in different directions. Each segment generates electric fields in specific orientations, enabling multi-directional control of liquid crystal molecules without requiring additional filter layers, thus achieving viewing angle adjustment while simplifying fabrication
Solution Approach 2:
Different regions of the pixel electrode are designed with different orientations and shapes to create localized electric field patterns. The first, second, and third pixel electrode segments have distinct geometries that generate electric fields oriented at different angles, allowing spatially varying control of liquid crystal alignment to achieve wide viewing angles
2Adaptability or versatility
If filters are used to adjust the viewing angle of LCD devices, then the viewing angle can be controlled, but power consumption increases
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode segment, second pixel electrode segment, third pixel electrode segment) arranged in different directions. Each segment generates electric fields in specific orientations, enabling multi-directional control of liquid crystal molecules without requiring additional filter layers, thus achieving viewing angle adjustment while simplifying fabrication
Solution Approach 2:
Different regions of the pixel electrode are designed with different orientations and shapes to create localized electric field patterns. The first, second, and third pixel electrode segments have distinct geometries that generate electric fields oriented at different angles, allowing spatially varying control of liquid crystal alignment to achieve wide viewing angles
3Reliability
If a narrow viewing angle is used for applications like internet banking or ATMs, then security is improved, but the device loses adaptability for different viewing conditions
Solution Approach 1:
The liquid crystal display enables dynamic adjustment of viewing characteristics through voltage control. By applying different voltages to the segmented pixel electrodes, the liquid crystal molecules can be reoriented to provide either narrow viewing angles for security applications or wider angles for general use, making the viewing angle adaptable rather than fixed
Solution Approach 2:
The patent utilizes voltage as a controllable parameter to change the orientation of liquid crystal molecules. By varying the voltage applied to different pixel electrode segments, the display can dynamically adjust its effective viewing angle, transitioning between security-oriented narrow angles and usability-oriented wider angles
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 enables symmetrically adjustable viewing angles without filters, reducing flicker and improving image quality by using an additional sub-pixel region to display a white image along an oblique direction, enhancing color reproducibility and restricting the viewing angle effectively.
Implementation Method 1
a liquid crystal display (LCD) device relies on an optical anisotropy and a polarizability of liquid crystal molecules to produce an image. The optical anisotropy of liquid crystal molecules causes a refraction of light incident onto the liquid crystal molecules in accordance with an alignment direction of the liquid crystal molecules
Implementation Method 2
a liquid crystal display (LCD) device relies on an optical anisotropy and a polarizability of liquid crystal molecules to produce an image
Implementation Method 3
The alignment direction of the liquid crystal molecules can be controlled by applying an electric field thereto
Data Source
AI summary
A liquid crystal display device includes first and second substrates facing and spaced apart from each other, each of the first and second substrates having a first sub-pixel region, a second sub-pixel region, a third sub-pixel region, a fourth sub-pixel region and a fifth sub-pixel region for adjusting a viewing angle, the first, second, third and fourth sub-pixel regions surrounding the fifth sub-pixel region; a liquid crystal layer between the first and second substrates; a plurality of first pixel electrodes in each of the first, second, third and fourth sub-pixel regions on the first substrate; a plurality of first common electrodes in each of the first, second, third and fourth sub-pixel regions on the first substrate, the plurality of first common electrodes alternating with the plurality of first pixel electrodes; a second pixel electrode in the fifth sub-pixel region on the first substrate; and a second common electrode in the fifth sub-pixel region on the second substrate, the second common electrode facing the second pixel electrode.