Display Panel Agglomerates Around Spacers Reduce Light Leakage
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Solution Overview
Problem
Conventional display panels experience light leakage in the dark state due to liquid crystal molecules tilting along the surfaces of spacers, leading to regions of light leakage around the spacers.
Innovation Solution
Incorporating agglomerates between the alignment films surrounding the spacers, which alter the pre-tilted angles of liquid crystal molecules, thereby reducing light leakage by providing a resistive force against the spacer profiles and promoting more vertical alignment of liquid crystals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spacers are used to maintain uniform cell gap, then uniform gap between substrates is achieved, but light leakage occurs around the spacers due to liquid crystal molecules tilting along the spacer surfaces
Solution Approach 1:
An orientation patterned polymer layer is introduced as an intermediary between the spacers and the liquid crystal molecules. This layer includes agglomeration regions with higher surface roughness positioned between the spacers and orientation regions, which mediate the interaction by providing a controlled interface that prevents liquid crystal molecules from tilting along the spacer surfaces, thereby eliminating light leakage while preserving the uniform cell gap maintenance function of the spacers
Solution Approach 2:
The polymer layer is patterned with different local properties: agglomeration regions with higher surface roughness are positioned between the spacers to control liquid crystal orientation locally, while orientation regions provide different characteristics. This local differentiation allows the spacer regions to maintain uniform gap without causing the light leakage problem that would occur with a uniform structure
2Ease of manufacture
If liquid crystal molecules align along spacer surfaces, then easy alignment is achieved, but pre-tilted angles are altered causing light leakage in dark state
Solution Approach 1:
The orientation patterned polymer layer serves as an intermediary that controls liquid crystal alignment. The agglomeration regions with higher surface roughness positioned between the spacers provide a controlled interface that guides liquid crystal molecules to achieve the desired pre-tilted angles without aligning along the spacer surfaces, thus preventing light leakage while maintaining ease of alignment through the polymer layer's orientation guidance
Solution Approach 2:
The polymer layer is prepared in advance with specific agglomeration regions having controlled surface roughness positioned between the spacers. This preliminary structuring of the polymer layer before liquid crystal alignment ensures that the liquid crystal molecules will achieve the correct pre-tilted angles during the alignment process, preventing light leakage from occurring
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 use of agglomerates effectively minimizes light leakage regions near the spacers, enhancing the display panel's performance in the dark state by adjusting the liquid crystal molecule angles and maintaining a uniform cell gap.
Implementation Method 1
alter the pre-tilted angles of liquid crystal molecules, thereby reducing light leakage by providing a resistive force against the spacer profiles
Data Source
AI summary
A display panel includes a first substrate having a first alignment film, a second substrate having a second alignment film and plural spacers, a liquid crystal layer disposed between the first and second substrates, and a plurality of agglomerates positioned between the first and second alignment films and further surrounding at least one of the spacers. The spacers maintain a uniform gap between the first and second substrates. The second alignment film is disposed oppositely to the first alignment film and covers the spacers. In one embodiment, sizes of the agglomerates are distributed in a range of 0.1 μm˜2 μm.