LCD Black Matrix Rough Structures Capillary Force
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Solution Overview
Problem
Conventional LCD panels face issues with air bubbles forming when liquid crystal molecules are introduced between substrates using the one drop fill method, leading to reduced yield due to insufficient capillary force, which makes it difficult to fully fill vias and results in vacuum bubbles that are hard to detect and resolve.
Innovation Solution
The implementation of an LCD panel design that includes a black matrix with protrusions or rough structures in the peripheral area, which increases the capillary force and reduces air bubbles by altering the contact area between the liquid crystal molecules and the substrates, thereby improving the filling of vias and reducing bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid crystal molecules are introduced between substrates by one drop fill method, then the liquid crystal molecules can be efficiently introduced into the display area, but the liquid crystal molecules are diffused to the periphery of the sealant due to capillary action, resulting in insufficient filling of vias and formation of vacuum bubbles
Solution Approach 1:
The black matrix is designed with different surface properties in different regions: the first region (central area) has a first surface energy and the second region (peripheral area) has a second surface energy that is lower than the first. This local differentiation controls capillary action to prevent liquid crystal diffusion to the sealant periphery while ensuring via filling in the display area, thus resolving the contradiction between efficient liquid crystal introduction and complete via filling.
2Quantity of substance
If the liquid crystal molecules are diffused to the periphery of the sealant, then the liquid crystal accommodation space is filled, but the vias between pixel electrodes and drain electrodes cannot be fully filled, leading to vacuum bubble formation
Solution Approach 1:
The invention changes the surface energy parameter of the black matrix by treating different regions differently. The first region maintains higher surface energy to allow liquid crystal diffusion for filling the accommodation space, while the second region has reduced surface energy to prevent excessive diffusion and ensure proper via filling, thereby eliminating vacuum bubbles and improving reliability.
3Productivity
If vacuum bubbles are formed in the vias, then the yield of the LCD panel is reduced, but the bubbles are located corresponding to drain electrodes and vias making them difficult to detect by naked eyes or image recognition systems
Solution Approach 1:
The invention uses a test ball that knocks edge regions of the LCD to detect bubbles. Additionally, the black matrix surface energy modification creates detectable differences in liquid crystal distribution patterns that can indicate bubble formation, making previously undetectable bubbles observable through visual or automated inspection methods.
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 enhances the capillary force in the peripheral area, reducing air bubble formation and improving the display quality by ensuring better filling of liquid crystal molecules in the vias, thus increasing the yield and detectability of any remaining bubbles.
Implementation Method 1
the liquid crystal molecules are diffused to the periphery of the sealant in a capillary manner
Implementation Method 2
the first region of the black matrix has a first surface energy and the second region of the black matrix has a second surface energy that is lower than the first surface energy
Data Source
AI summary
A liquid crystal display (LCD) panel includes an active device array substrate, an opposite substrate, a sealant, a liquid crystal layer, a black matrix, and a plurality of rough structures. The active device array substrate has a display area and a peripheral area surrounding the display area, and the liquid crystal layer and the peripheral area are surrounded by the sealant. The black matrix is disposed between the active device array substrate and the opposite substrate and distributed corresponding to the display area and the peripheral area. The rough structures are disposed on a portion of the black matrix and distributed corresponding to the peripheral area. Surface roughness of the rough structures is greater than surface roughness of the black matrix distributed corresponding to the display area.