Display Panel Encapsulation Structure for Uniform Touch Wires
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Solution Overview
Problem
In the manufacturing of display panels with integrated touch and display technologies, the non-uniform thickness of photoresist layers due to gravity-induced fluidity in slope regions leads to critical dimension biases and potential short circuits in touch wires, while ink overflow prevention methods result in incomplete encapsulation and film residue.
Innovation Solution
The display panel design includes a first barrier wall surrounding the display area, a blocking portion between the barrier wall and the display area, and a first encapsulation layer with a transition surface adapted to the slope of the blocking portion, ensuring the touch wires are positioned on a flatter surface of the encapsulation layer, thereby controlling critical dimension biases and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the touch wires are formed directly on a slope region of the encapsulation layer to prevent ink overflow, then ink overflow is prevented, but the photoresist layer thickness becomes non-uniform due to gravity-induced fluidity, causing critical dimension biases and potential short circuits
Solution Approach 1:
The patent introduces a blocking portion that creates a stepped structure, changing the spatial arrangement from a single slope region to multiple levels. The touch wires are positioned on a second surface that is substantially coplanar with the first surface, effectively moving the wire formation to a different dimensional plane (a flatter region) while maintaining the slope region's ink containment function.
Solution Approach 2:
The blocking portion acts as an intermediary element between the slope region and the touch wire formation region. It provides a transition structure with multiple surfaces, where the first surface prevents ink overflow and the second coplanar surface enables uniform photoresist coating and precise touch wire formation, mediating between the conflicting requirements.
2Object-affected harmful factors
If a slope region is created to prevent ink overflow, then ink containment is improved, but the encapsulation layer thickness becomes non-uniform, leading to film residue and incomplete encapsulation
Solution Approach 1:
The encapsulation layer is segmented into multiple distinct surfaces: a first surface on the slope region for ink containment, and a second coplanar surface for uniform film formation. This segmentation allows each region to fulfill its specific function without compromising the other, resolving the contradiction between ink prevention and film uniformity.
Solution Approach 2:
Different regions of the encapsulation layer are given different functional qualities: the slope region with its first surface provides ink overflow prevention, while the coplanar region with its second surface provides uniform photoresist coating and film formation. Each local region is optimized for its specific purpose.
Data Source
AI summary
A display panel includes: a display substrate, a first barrier wall surrounding a display area, a blocking portion between the first barrier wall and the display area, a first encapsulation layer covering at least the display area, and touch wires. The blocking portion at least partially surrounds the display area. The first encapsulation layer includes a first surface, a second surface and a transition surface located therebetween. On the display substrate, orthographic projections of the touch wires at least partially overlap with an orthographic projection of the second surface; and at least a portion of an orthographic projection of the transition surface is located in a region between a border, away from the display area, of an orthographic projection of the blocking portion and the display substrate and an orthographic projection of an edge of the first surface on the display substrate farthest away from the display area.