Display Power Line Layout Around Sealant for Narrow Bezels
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Solution Overview
Problem
Emissive display devices face challenges in reducing the non-display area while maintaining airtightness to prevent moisture and oxygen penetration, which affects the reliability and efficiency of power voltage transmission.
Innovation Solution
The design includes a power voltage transmitting line with specific protrusions and thickness variations to minimize overlap with the sealant, reducing the non-display area and increasing the screen-to-body ratio, thereby improving display quality and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the power voltage transmitting line is designed to overlap the sealant, then the non-display area is reduced and screen-to-body ratio is increased, but the resistance of the power wiring increases due to the overlap region
Solution Approach 1:
The power voltage transmitting line is divided into multiple segments: a first portion overlapping the sealant, a second portion not overlapping the sealant, and protrusions extending from the second portion. This segmentation allows different regions of the transmitting line to serve different functions - the non-overlapping portions maintain low resistance while the overlapping portion is compensated by the protrusions.
Solution Approach 2:
The transmitting line has non-uniform thickness with thicker regions (protrusions) positioned at specific locations where it does not overlap the sealant. This local quality variation compensates for the resistance increase in the overlapping region, ensuring uniform power transmission across the entire line while minimizing the overall non-display area.
2Reliability
If the power voltage transmitting line has non-uniform thickness to compensate for resistance, then power transmission uniformity is improved, but the manufacturing complexity increases
Solution Approach 1:
The non-uniform thickness pattern is pre-designed into the transmitting line structure during the fabrication process. The protrusions and varying thickness regions are formed in advance as part of the standard manufacturing sequence, allowing the resistance compensation to be achieved without adding complex post-processing steps or requiring precise manual adjustment.
3Loss of energy
If the transmitting line is designed with protrusions extending beyond the sealant, then the resistance is reduced and power efficiency is improved, but the device complexity increases
Solution Approach 1:
The protrusions of the power voltage transmitting line are merged with the sealant structure in the overlapping region. This integration allows the transmitting line to extend into regions that would otherwise be occupied by the sealant, effectively utilizing the available space and reducing resistance without requiring separate compensation structures or additional components.
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 configuration reduces the non-display area, decreases power wiring resistance, and enhances display quality by ensuring uniform power transmission, leading to improved power efficiency and reduced power consumption.
Implementation Method 1
the display device may have an encapsulation structure to prevent or substantially prevent moisture or oxygen from penetrating from the outside so that the light emitting elements are not damaged
Implementation Method 2
a laser is irradiated to the frit to combine the substrate and the encapsulating substrate by the melted and cured frit (a sealant)
Implementation Method 3
the power voltage transmitting line includes a first portion overlapping the sealant and extending in a first direction, and a second portion not overlapping the sealant, and the second portion includes a first protrusion protruded from the first portion in a second direction crossing the first direction
Data Source
AI summary
A display device includes a first substrate including a display area and a non-display area around the display area; a pad portion at an end part of the first substrate in the non-display area; a power voltage transmitting line electrically connected to the pad portion and surrounding at least part of the display area; a second substrate facing the first substrate; and a sealant between the first substrate and the second substrate and surrounding the display area. In the end part, the power voltage transmitting line includes a first portion overlapping the sealant and extending in a first direction and a second portion not overlapping the sealant, and the second portion includes a first protrusion protruded from the first portion in a second direction crossing the first direction, and a second protrusion protruded in a direction opposite to the second direction.