Display Substrate Step Compensation for Uniform Cell Gap
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Solution Overview
Problem
In liquid crystal displays (LCDs), the step difference between seal line patterns in non-display areas can lead to non-uniform cell gaps, affecting the display's performance and reliability.
Innovation Solution
A step compensation portion is introduced to equalize the step difference between the first and second seal line patterns in the non-display areas, ensuring a uniform cell gap between the display substrate and the common voltage substrate by overlapping data wiring patterns and active layers, which are electrically connected to prevent parasitic capacitors and ensure proper signal delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seal line patterns are formed in non-display areas to bond display substrate to common voltage substrate, then bonding function is achieved, but step difference between seal line patterns causes non-uniform cell gap
Solution Approach 1:
A step compensation portion is formed in advance in the non-display area before forming the seal line patterns. This preliminary structure compensates for the step difference that would otherwise be created by the seal lines, ensuring that the top surfaces of the seal line patterns are substantially coplanar with the display substrate surface, thereby achieving uniform cell gap from the outset
Solution Approach 2:
The step compensation portion is localized specifically in the non-display area where it is needed, without affecting the display area. This localized compensation allows the seal line patterns to maintain their bonding function while the compensated area ensures uniform cell gap, addressing the problem locally without altering the overall device structure
2Manufacturing precision
If data wiring patterns and active layers are overlapped to compensate step difference, then cell gap uniformity is improved, but parasitic capacitors may form
Solution Approach 1:
An insulating layer is introduced as an intermediary between the data wiring pattern and the active layer in the step compensation portion. This insulating layer electrically isolates the two conductive elements, preventing parasitic capacitor formation while still allowing the data wiring pattern to provide the necessary step compensation for achieving uniform cell gap
Data Source
AI summary
Provided are a display substrate and a method of fabricating the same. The display substrate includes: a substrate including a display area and a first non-display area and a second non-display area which are located around the display area; first signal transmission portions located in the first non-display area; second signal transmission portions located in the second non-display area; and a seal line including a first seal line pattern disposed on the first signal transmission portions and a second seal line pattern disposed on the second signal transmission portions, wherein each of the first signal transmission portions includes a gate wiring and a step compensation portion which is disposed on the gate wiring and under the first seal line pattern, and the first seal line pattern overlaps the step compensation portion.