Curved LCD Panel Misalignment Texture via Pixel Electrode Angles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in liquid crystal displays is the texture generated by misalignment of the upper and lower panels when a flat LCD is bent to form a curved display, which affects the viewing angle and immersion experience.
Innovation Solution
A liquid crystal display design featuring a flexible substrate with a pixel electrode having specific angled minute branches and sub-regions, along with a common electrode, to maintain alignment and prevent misalignment between the upper and lower panels, utilizing a reactive mesogen in the liquid crystal layer for precise pretilt direction control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flat liquid crystal display is bent to form a curved display, then the immersion experience and viewing angle are improved, but misalignment between the upper and lower panels occurs causing texture
Solution Approach 1:
The pixel electrode is divided into multiple sub-regions (first, second, third, and fourth sub-regions) with different angle characteristics. The third sub-region has a smaller angle between minute branches and transverse stem compared to other sub-regions, creating local variations in pretilt direction to compensate for misalignment during bending and maintain uniform brightness across the curved display
Solution Approach 2:
The pixel electrode structure is designed in advance with specific angle configurations in different sub-regions before the bending process. This preliminary geometric arrangement ensures that when the display is bent, the pretilt directions of liquid crystal molecules are already optimized to compensate for the expected misalignment, preventing texture formation
2Device complexity
If the pixel electrode has uniform minute branch angles across all sub-regions, then the structure is simple, but texture is generated due to misalignment in curved displays
Solution Approach 1:
Different angle values are assigned to different sub-regions of the pixel electrode. Specifically, the third sub-region has a smaller angle (10-40 degrees) between minute branches and transverse stem compared to other sub-regions (45-80 degrees), creating localized pretilt direction variations that compensate for bending-induced misalignment and eliminate texture
Solution Approach 2:
The pixel electrode structure introduces asymmetric angle configurations across different sub-regions rather than using uniform symmetric geometry. This asymmetric design allows the third sub-region to have different pretilt characteristics that specifically address the misalignment problem in curved displays
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
This design effectively reduces the texture caused by panel misalignment, enhancing the viewing angle and immersion by maintaining consistent brightness and preventing dark regions, thereby improving the transmittance and visual experience of the curved display.
Implementation Method 1
in an alignment method in which prepolymers polymerized by light such as ultraviolet rays are used to pretilt the liquid crystal molecules, the field generating electrodes are respectively applied with desired voltages and are then exposed to the light
Implementation Method 2
a voltage is applied to the field generating electrodes to generate an electric field in the liquid crystal layer, which determines the direction of liquid crystal molecules of the liquid crystal layer
Data Source
AI summary
A liquid crystal display includes: a flexible first substrate; a pixel electrode positioned on the first substrate and including an outer stem with a quadrangular shape, a crossed-shape stem including a transverse stem positioned inside the outer stem and a longitudinal stem crossing the transverse stem, and a plurality of minute branches extending from the outer stem and the crossed-shape stem; a flexible second substrate facing the first substrate; a common electrode positioned on the second substrate; and a liquid crystal layer including liquid crystal molecules interposed between the first substrate and the second substrate. An angle formed by minute branches of one sub-region of the pixel electrode positioned at second, third and fourth zones and the transverse stem is smaller than an angle formed by minute branches of three other sub-regions of the pixel electrode positioned at the second, third, and fourth zones and the transverse stem.