Array Substrate Protruding Pattern for LCD Cell Gap Control
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Solution Overview
Problem
Current liquid-crystal display (LCD) devices face challenges in achieving improved display quality and reliability, particularly in maintaining consistent cell gaps and preventing short circuits due to changes in the cell gap and potential defects from the opposing substrate's dented structure.
Innovation Solution
An array substrate design featuring a base substrate with a display area and peripheral area, including thin-film transistors, insulation layers, and protruding patterns made of the same material, where the insulation layers have different exposure levels to light, creating varying hardness and a protruding pattern that aids in maintaining cell gap consistency and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opposing substrate has a dented structure to compensate for cell gap changes, then display quality can be maintained under certain conditions, but short circuits may occur due to the dented structure contacting the array substrate
Solution Approach 1:
The protruding pattern is formed in advance during the array substrate fabrication process, before the opposing substrate is assembled. This protruding pattern pre-establishes a physical barrier that prevents the dented structure of the opposing substrate from contacting the array substrate, thereby preventing short circuits before they can occur.
Solution Approach 2:
The protruding pattern acts as an intermediary element between the array substrate and the dented structure of the opposing substrate. It provides a protective barrier that mediates the interaction between these two components, preventing direct contact that would cause short circuits while allowing the dented structure to continue functioning for cell gap compensation.
2Reliability
If additional masks are used to form protective structures for preventing short circuits, then reliability can be improved, but the fabrication process becomes more complex
Solution Approach 1:
The protruding pattern is formed by merging the protective structure formation with the existing insulation layer fabrication process. The same insulating material is used, and the patterning is integrated into the existing photolithography steps, eliminating the need for separate protective structure fabrication processes and additional masks.
Solution Approach 2:
The protruding pattern serves multiple functions: it provides electrical insulation to prevent short circuits, maintains the cell gap between substrates, and acts as a structural support element. By making this single structure multi-functional, the patent avoids the need for separate dedicated protective structures that would require additional fabrication steps.
3Reliability
If the cell gap is increased to prevent contact between substrates, then short circuits are prevented, but display quality deteriorates due to inconsistent light transmission
Solution Approach 1:
The protruding pattern provides localized protection at specific critical areas where short circuits are most likely to occur, rather than uniformly increasing the cell gap across the entire display area. This localized approach prevents short circuits while maintaining consistent light transmission and display quality across the full viewing area.
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 display quality and reliability by maintaining consistent cell gaps and preventing short circuits, while also simplifying the fabrication process by eliminating the need for additional masks, thus improving the overall performance of the LCD device.
Implementation Method 1
the insulation layers have different exposure levels to light, creating varying hardness
Data Source
AI summary
Disclosed herein are an array substrate and a display device including the same. The array substrate includes a base substrate comprising a display area and a peripheral area; a thin-film transistor disposed in the display area of the base substrate; an insulation layer disposed in the display area of the base substrate, the insulation layer comprising a first portion covering the thin-film transistor and a second portion located on the first portion; and a first protruding pattern disposed in the peripheral area of the base substrate, wherein the first portion, the second portion and the first protruding pattern comprise the same material.