Liquid Crystal Display Recessed Groove Alignment Film Control
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Solution Overview
Problem
Existing liquid crystal display devices face issues with the spreading of orientation film material towards the sealing region, leading to potential liquid crystal leakage due to adhesiveness deterioration between the substrate and sealing material, and previous solutions are limited by the arrangement of conductive wiring layers.
Innovation Solution
The implementation of recessed grooves in the third insulating layer, positioned between the display region and the annular seal, which are designed to trap the alignment layer material and prevent wetting, allowing for the suppression of orientation film spreading without being constrained by the arrangement of scanning and video signal lines, with the bottom area of the grooves positioned on or above the second insulating layer covering the conductive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If recessed grooves are formed in previous insulating layers to suppress orientation film spreading, then the spreading prevention effect is achieved, but the wiring arrangement is constrained and design flexibility is reduced
Solution Approach 1:
The patent forms recessed grooves in the third insulating layer (a higher layer in the vertical dimension) rather than in lower insulating layers. This dimensional change allows the grooves to be positioned independently of the wiring patterns in lower layers, achieving both spreading prevention and wiring design flexibility. The grooves extend in the vertical dimension to intercept the orientation film while leaving horizontal wiring arrangements unconstrained.
2Reliability
If the alignment layer material spreads towards the sealing region, then the adhesiveness between substrate and sealing material deteriorates, but forming recessed grooves in lower insulating layers is limited by wiring arrangement
Solution Approach 1:
The patent applies recessed grooves locally in the third insulating layer at specific positions between the display region and sealing region. This localized structure provides spreading prevention exactly where needed without affecting the wiring arrangements in lower layers. The grooves are positioned to intercept orientation film material before it reaches the sealing region, maintaining adhesiveness while avoiding constraints from underlying wiring patterns.
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 configuration effectively prevents the spreading of the alignment layer material towards the sealing region, enabling a reduced bezel size and maintaining even thickness within the display region for improved image quality, while allowing for flexible design of the recessed grooves independent of the conductive wiring layout.
Implementation Method 1
the at least one recessed groove is formed in the third insulating layer and is located at a region between the display region and the annular seal
Data Source
AI summary
A liquid crystal display device includes an annular seal located between a first substrate and a second substrate, and a liquid crystal layer sealed in a space surrounded by the first substrate, the second substrate, and the annular seal. The first substrate includes a first metal layer, a first insulating layer covering the first metal layer, a second metal layer formed on the first insulating layer, a second insulating layer covering the second metal layer, a third metal layer formed on the second insulating layer, a third insulating layer covering the third metal layer, an alignment layer arranged on the third insulating layer, and a display region where a plurality of pixels are formed. At least one recessed groove is formed in the third insulating layer and is located at a region between the display region and the annular seal.