Array Substrate High Level Portion Alignment Film Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing liquid crystal display devices face issues with film thickness unevenness of the alignment film, leading to display defects due to material accumulation on the black layer in contact holes, which affects the alignment of liquid crystals and results in visual display defects.
Innovation Solution
The array substrate design includes a high level portion in the insulating portion of the alignment film, which is higher than the opening edge of the first insulating film, and light blocking portions to prevent material accumulation and ensure uniform film thickness, thereby maintaining proper liquid crystal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the black layer is formed flush with the insulating layer in the contact hole, then the light blocking function is improved, but the alignment film material accumulates on the black layer causing film thickness unevenness
Solution Approach 1:
The patent applies preliminary action by forming the light blocking layer to protrude above the insulating layer surface before the alignment film is deposited. This pre-positioning of the light blocking layer creates a controlled geometry that prevents material accumulation during subsequent alignment film formation, thereby resolving the contradiction between light blocking effectiveness and film thickness uniformity.
2Object-affected harmful factors
If the alignment film material accumulates on the black layer, then the light blocking function is enhanced, but the film thickness of the alignment film becomes locally thin or not formed
Solution Approach 1:
The patent applies local quality by creating a protruding light blocking layer with specific geometric characteristics that differ from the surrounding insulating layer. This localized structural modification changes the deposition dynamics only in the contact hole region, allowing the alignment film to be deposited uniformly across the entire surface while maintaining effective light blocking in the contact hole area.
3Ease of manufacture
If the alignment film is locally thin or not formed, then the manufacturing process is simplified, but the liquid crystal alignment is disturbed causing display defects
Solution Approach 1:
The patent uses preliminary action by pre-forming the protruding light blocking layer structure before alignment film deposition. This pre-configured geometry guides the alignment film material to deposit uniformly without accumulation, ensuring complete and even coverage that maintains proper liquid crystal alignment while keeping the deposition process simple and straightforward.
Data Source
AI summary
An array substrate includes a first electrode, a first insulating film disposed on an upper layer side of the first electrode, the first insulating film being provided with an opening at a position overlapping at least the first electrode, a second electrode disposed on an upper layer side of the first insulating film, the second electrode overlapping the first electrode at least in the opening, and being connected to the first electrode, a second insulating film disposed on an upper layer side of the second electrode, and an alignment film disposed on an upper layer side than the second insulating film. The second insulating film includes an insulating portion provided in the opening, and the insulating portion includes a high level portion higher than an opening edge of the opening of the first insulating film.