Metal Ring and Insulating Filler for LCD Black Matrix
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Solution Overview
Problem
In liquid crystal display panels using In-Plane Switching (IPS) technology, high temperatures and potential on the thin film transistor array substrate can cause abnormal conductivity in the black matrix layer, leading to abnormal electric fields and liquid crystal alignment, resulting in bright lines on the display edges due to abnormal electric field interactions.
Innovation Solution
A metal ring is implemented around the display area on the thin film transistor array substrate, with a width greater than the gap in the black matrix, to prevent charge leakage and light leakage, and an insulating filler is used to fill the gap in the black matrix to maintain evenness of the planar layer and prevent charge transfer from non-display to display areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the black matrix layer is used in the liquid crystal display panel, then it provides light blocking and structural support, but it develops abnormal conductivity at high temperatures and high potentials, causing abnormal electric fields and bright lines on the display edges
Solution Approach 1:
The black matrix layer is segmented by introducing a gap that divides it into separate regions. This gap prevents the formation of continuous abnormal electric fields while maintaining the light blocking function in the display area. The black matrix is split into first and second black matrix layers separated by the gap, isolating abnormal charges.
Solution Approach 2:
An insulating filler is introduced as an intermediary substance to fill the gap in the black matrix layer. This insulating material prevents charge transfer between the first and second black matrix layers while maintaining structural integrity and planarity. The insulating filler acts as a mediator that blocks abnormal conductivity paths.
2Reliability
If a gap is introduced in the black matrix layer to prevent abnormal conductivity, then charge transfer is blocked, but light leakage may occur around the display area
Solution Approach 1:
A metal ring is introduced as a thin film structure that covers the gap in the black matrix layer. This metal ring is transparent or translucent to light, allowing light to pass through while providing electrical shielding to prevent light leakage and abnormal electric field formation. The metal ring acts as a flexible shielding layer that addresses both charge isolation and light leakage prevention.
3Stability of the object's composition
If the black matrix layer is made continuous to maintain structural integrity, then it provides uniform light blocking, but abnormal electric fields can form and cause liquid crystal alignment issues
Solution Approach 1:
The continuous black matrix layer is segmented by introducing a gap that divides it into separate first and second black matrix layers. This segmentation prevents the formation of continuous abnormal electric fields while maintaining structural integrity through the insulating filler and metal ring support structures.
Solution Approach 2:
The problematic continuous conductive path is extracted by removing a portion of the black matrix layer to create the gap. This extracted section eliminates the abnormal electric field formation while the surrounding structures maintain overall structural integrity and support.
4Object-affected harmful factors
If the metal ring width is increased to better prevent light leakage, then light blocking improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The metal ring is designed to perform multiple functions simultaneously: it prevents light leakage, provides electrical shielding, maintains planarity of the planar layer, and supports the insulating filler. This multi-functionality reduces the need for additional separate components, thereby simplifying the overall device structure despite the increased width of the metal ring.
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 effectively prevents abnormal electric field interference and light leakage, ensuring normal liquid crystal alignment and display quality by isolating abnormal charges and maintaining the sealing properties of the panel.
Implementation Method 1
An opaque metal ring 101 surrounding the display area 10A is provided on a side of the second substrate 102 facing the color filter substrate 20
Implementation Method 2
an insulating filler is used to fill the gap in the black matrix to maintain evenness of the planar layer and prevent charge transfer from non-display to display areas
Implementation Method 3
In-Plane Switching (IPS) technology utilizes a fringe electric field generated between the upper and lower electrodes on the thin film transistor array substrate to drive the liquid crystal molecules to rotate on a horizontal plane parallel to the thin film transistor array substrate
Data Source
AI summary
A liquid crystal display panel defines a display area and a non-display surrounding the display area. The panel includes a color filter substrate and a thin film transistor array substrate opposite to the color filter substrate. The color filter substrate includes a first substrate and a black matrix on the first substrate. The black matrix is in the display area and extending to the non-display area. A gap is defined in the black matrix and in the non-display area. The gap extends to be a circle around the display area and divides the black matrix into two independent parts. The color filter substrate includes a second substrate and a metal ring on a side of the second substrate facing the thin film transistor array substrate. The metal ring surrounds the display area and aligns with the gap.