LCD Holding Member Prevents Substrate Shift During Bending
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Solution Overview
Problem
In liquid crystal display (LCD) panels, the top and bottom substrates shift laterally when the cell is bent, leading to issues like light leakage, mura, yellowish tint, poor transmittance, and color mixing due to the lack of a robust mechanism to maintain substrate alignment during bending.
Innovation Solution
A holding member is formed in the light shielding region using a polymer created by exposing monomers mixed with liquid crystal molecules to ultraviolet (UV) light, which attaches the substrates together, preventing them from shifting during bending. This holding member can be elastic or rigid and is designed to cover a significant portion of the light shielding region, ensuring the substrates remain aligned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LCD panel uses conventional substrate assembly without holding members, then the manufacturing process is simpler, but the substrates shift laterally during bending causing display defects
Solution Approach 1:
The holding members are formed in advance within the liquid crystal layer before final assembly, creating a pre-positioned alignment mechanism that prevents substrate shift during bending operations
Solution Approach 2:
The holding members change their physical properties through UV light exposure, transitioning from a liquid monomer state to a solid polymer state, thereby transforming from a fluid that fills gaps to a rigid structure that maintains alignment
2Reliability
If holding members are formed using UV light polymerization, then substrate alignment is maintained during bending, but additional manufacturing steps are required
Solution Approach 1:
The alignment function of holding members is merged with the liquid crystal filling process, where the same material (monomer) serves both as a placeholder during assembly and as the final alignment-maintaining structure after polymerization
Solution Approach 2:
The monomer material itself performs the alignment function during assembly, then transforms into the holding member that maintains alignment, eliminating the need for separate alignment mechanisms or additional components
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 holding member effectively prevents substrate shift during bending, reducing light leakage and improving display characteristics by eliminating defects such as mura, yellowish tint, and color mixing, thereby enhancing the overall display quality.
Implementation Method 1
exposing the space to a first UV light causing the first monomers to be polymerized to form a holding member in the light shielding region to attach the first substrate and the second substrate
Implementation Method 2
The holding member can be elastic or rigid and is designed to cover a significant portion of the light shielding region, ensuring the substrates remain aligned
Data Source
AI summary
A pixel structure having a light transmitting region and a light shielding region usable in an liquid crystal display includes a first substrate having a counter electrode, a second substrate having a plurality of signal lines, a pixel electrode, a thin-film transistor (TFT) and a bottom black matrix, a liquid crystal layer having liquid crystal molecules and formed between the first substrate and the second substrate, and a holding member formed in the light shielding region and attached to the first substrate and the second substrate.