Nested Bank Structure for Frame Narrowing in Display Devices
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Solution Overview
Problem
Current display devices face challenges in frame narrowing, which affects their design and functionality.
Innovation Solution
The display device incorporates specific layer configurations, including an inorganic insulating film, metal layers, flattening films, electrodes, edge covers, and banks with varying inclination angles to achieve frame narrowing, ensuring protection and preventing short circuits while maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the frame width is reduced to achieve frame narrowing, then the display area is increased, but the structural integrity and protection of internal components may be compromised
Solution Approach 1:
The patent implements a nested bank structure where a first bank and second bank are arranged in layers, with the first bank positioned at a first depth and the second bank at a second depth greater than the first depth. This nested arrangement allows the banks to provide structural support and protection while occupying minimal horizontal space, thereby enabling frame narrowing without compromising structural integrity.
Solution Approach 2:
The patent transitions from a conventional single-layer bank structure to a multi-depth layered structure. By arranging banks at different depths (first depth and second depth), the design utilizes the vertical dimension to provide structural support and protection, allowing the horizontal frame width to be reduced while maintaining reliability.
2Ease of manufacture
If the bank structure is simplified to reduce manufacturing complexity, then the manufacturing process is easier, but the protection against leaks and short circuits may be insufficient
Solution Approach 1:
The patent divides the bank structure into multiple segments: a first bank with a first bank upper portion and first bank lower portion, and a second bank with a second bank upper portion and second bank lower portion. Each segment serves specific protective functions, with the first bank providing initial protection and the second bank providing additional protection at a different depth, thereby enhancing reliability while maintaining manufacturability through modular construction.
Solution Approach 2:
The nested arrangement of the first bank and second bank at different depths creates a multi-layered protection system. The first bank upper portion covers the first bank lower portion, and the second bank upper portion covers the second bank lower portion, with the second bank positioned at a greater depth. This nested structure provides redundant protection against leaks and short circuits while following a systematic manufacturing approach.
3Reliability
If the inclination angle of the bank upper portion is increased to improve coverage, then the protection of the bank lower portion is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies that the inclination angle of the side surface of the bank upper portion should be greater than the inclination angle of the side surface of the bank lower portion. This local quality differentiation optimizes the coverage and protection at the upper portion where it is most needed, while maintaining a more gradual angle at the lower portion that is easier to manufacture with standard precision.
Data Source
AI summary
In the display device according to the disclosure, a first bank includes a first bank lower portion in the same layer as a flattening film and a first bank upper portion in the same layer as an edge cover. A second bank includes a second bank lower portion in the same layer as the flattening film and a second bank upper portion in the same layer as the edge cover. The first bank upper portion covers an upper surface and a side surface of the first bank lower portion, the side surface being on a side close to a display region. An inclination angle of a side surface of the first bank upper portion on a side close to the display region is larger than an inclination angle of the side surface of the first bank lower portion on the side close to the display region.