Display Panel Barrier Geometry for PI Flow Control
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Solution Overview
Problem
In current display panel designs, the thin and lightweight substrate can cause polyimide (PI) droplets in the dummy region near the display region to be unevenly distributed, leading to a small pretilt angle and increased likelihood of mura, stains, or smudges in the bezel, which is difficult to address efficiently with existing tuning methods.
Innovation Solution
The display panel incorporates a design with first and second non-display regions, featuring barriers with varying edge sizes and shapes, such as trapezoids or sawtooth patterns, to reduce the contact area and resistance of PI solution, facilitating its flow and increasing thickness in the second non-display region, thereby preventing mura and smudges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the substrate is made thin and lightweight, then the weight and thickness are reduced, but the polyimide distribution becomes uneven and PI thickness decreases in the dummy region
Solution Approach 1:
The patent applies local quality by creating barriers with different edge dimensions at different locations. The first barriers have a first edge dimension closer to the display region and a second edge dimension farther from the display region, where the second dimension is smaller than the first. This local variation in barrier geometry compensates for the substrate inclination effect, ensuring uniform PI distribution and thickness across the dummy region while maintaining the thin and lightweight substrate characteristics.
2Manufacturing precision
If traditional tuning methods are used to adjust PI distribution, then PI thickness can be improved, but the processing cycle becomes long and efficiency decreases
Solution Approach 1:
The patent implements preliminary action by pre-configuring the first barriers with specific edge dimensions before the PI coating process. The barriers are designed in advance with a first edge dimension closer to the display region and a smaller second edge dimension farther from the display region. This pre-arranged barrier structure proactively compensates for expected PI distribution issues due to substrate inclination, eliminating the need for time-consuming post-processing tuning and significantly improving manufacturing efficiency.
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 approach enhances the efficiency and speed of PI distribution, reducing the occurrence of mura and smudges in the second non-display region, while avoiding the long processing cycles and low efficiency associated with traditional tuning methods.
Implementation Method 1
a plurality of first barriers, disposed on the first substrate at intervals and located in the first non-display region, wherein an edge of at least one of the first barriers at a side away from the display region is smaller than an edge of the first barrier at a side close to the display region
Data Source
AI summary
The present invention relates to a display panel and a display apparatus. An edge of at least one of first barriers of the present invention at a side away from a display region is smaller than an edge of the first barrier at a side close to the display region, thereby reducing the resistance of a polyimide (PI) solution located in a first non-display region to a second non-display region, increasing the speed of the PI solution located in the first non-display region flowing toward the second non-display region, and eventually increasing the thickness of polyimide in the second non-display region such that stains or smudges appearing in the second non-display region are avoided.