Display Substrate Pattern Layer Alignment Liquid Accumulation
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with alignment layer accumulation, leading to bulk stains and adverse effects on display quality, particularly under certain gray scale conditions.
Innovation Solution
A display substrate design that includes a base substrate, an alignment layer, a first electrode, and a pattern layer, where the pattern layer and first electrode are arranged such that their orthographic projections do not overlap, and the contact angle ratio of the pattern layer to the first electrode is between 7/12 and 3/2, effectively reducing the 'pulling effect' on alignment liquid and preventing accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the alignment layer is coated uniformly across the substrate, then the alignment layer provides consistent alignment, but alignment layer accumulation occurs at the lap joint between the first electrode and pattern layer, causing bulk stains and display quality degradation
Solution Approach 1:
The patent extracts the harmful lap joint structure by making the orthographic projections of the first electrode and pattern layer non-overlapping. This removes the location where alignment layer accumulation occurs, eliminating the source of the problem while preserving the alignment layer's uniform coating across the substrate.
Solution Approach 2:
The patent applies local quality by controlling the contact angles of the first electrode and pattern layer to satisfy a specific ratio relationship. This creates different local wetting properties at the electrode and pattern layer surfaces, preventing alignment liquid from being pulled to the lap joint region and thus preventing accumulation.
2Device complexity
If the first electrode and pattern layer are arranged with overlapping projections, then the structure is simpler, but the alignment liquid experiences a pulling effect toward the lap joint, causing accumulation and bulk stains
Solution Approach 1:
The patent removes the overlapping projection configuration that causes the pulling effect. By arranging the first electrode and pattern layer such that their orthographic projections do not overlap, the lap joint location is eliminated, and with it the harmful pulling effect on alignment liquid that causes accumulation.
Solution Approach 2:
The patent changes the geometric parameter of the electrode and pattern layer arrangement from overlapping to non-overlapping projections. This parameter change fundamentally alters the alignment liquid flow behavior, preventing the pulling effect and subsequent accumulation while maintaining manufacturing feasibility.
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 proposed solution reduces the risk of alignment layer accumulation, thereby improving display quality and preventing bulk stains, even under challenging gray scale conditions.
Implementation Method 1
a ratio of a contact angle of the pattern layer to a contact angle of the first electrode is greater than or equal to 7/12 and less than 3/2
Data Source
AI summary
A display substrate includes a base substrate, first electrodes arranged in an array on the base substrate, a first signal line, a second signal line crosswise arranged with the first signal line, and a pattern layer arranged at a same layer and made of a same material as the first electrode. An orthographic projection of the pattern layer on the base substrate does not overlap an orthographic projection of the first signal lines on the base substrate. The first electrode comprises a first strip electrode. An extension direction of the first strip electrode is intersected with a row direction and a column direction.