Electrode Dam Structure for Display Bezel Reduction
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Solution Overview
Problem
Display devices face challenges in reducing the non-active bezel area while maintaining moisture permeation prevention performance, as existing methods struggle to precisely control the thickness and process tolerance of dams, leading to increased bezel width and potential degradation of moisture barrier effectiveness.
Innovation Solution
The use of an electrode to form a dam in the non-active area between the substrate and encapsulation substrate, allowing for precise dam formation and scribing to reduce the bezel width by eliminating process tolerance, while maintaining moisture permeation prevention performance through careful material selection and configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-active bezel area is reduced to increase screen immersion and aesthetics, then the active area size increases, but moisture permeation prevention performance degrades
Solution Approach 1:
The dam structure is segmented into multiple sections with different heights along the perimeter of the active area. The first dam section has a first height and the second dam section has a second height, creating a stepped configuration that provides enhanced moisture barrier protection at critical locations while allowing the overall bezel area to be minimized.
Solution Approach 2:
Different regions of the dam structure are assigned different properties through varying heights and material compositions. The first and second dam sections have different heights tailored to local requirements, and the dam may have different materials in different regions to optimize both moisture protection and bezel reduction.
2Ease of manufacture
If conventional dam formation methods are used, then manufacturing is simpler, but dam thickness variation occurs and process tolerance increases bezel width
Solution Approach 1:
The dam formation process replaces conventional mechanical dispensing methods with a dispensing apparatus that uses controlled material extrusion through nozzles. This substitution enables precise control of dam thickness and position, eliminating the thickness variations and process tolerances inherent in traditional mechanical methods while maintaining manufacturing feasibility.
3Area of stationary object
If the bezel width is reduced to minimize non-active area, then screen immersion increases, but the reliability of moisture barrier protection decreases
Solution Approach 1:
The dam structure transitions from a conventional single-height configuration to a multi-dimensional stepped structure with different height levels. The first and second dam sections create vertical dimensionality that enhances moisture barrier effectiveness without increasing the horizontal bezel width, thus protecting against moisture while minimizing the non-active area.
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 effectively reduces the non-active bezel area without compromising moisture permeation prevention, enhancing the reliability and aesthetics of display devices by minimizing the bezel width and maintaining the necessary moisture barrier properties.
Implementation Method 1
by forming a dam using an electrode, it is possible to precisely form the dam without a thickness variation
Implementation Method 2
an adhesive film disposed between the substrate and the encapsulation substrate
Data Source
AI summary
A display device can include a substrate having an active area and a non-active area adjacent to the active area, an encapsulation substrate disposed over the substrate, a dam disposed in the non-active area between the substrate and the encapsulation substrate and an electrode disposed on a first surface of the encapsulation substrate or the substrate, and overlapping the dam. By forming the dam using the electrode, the dam can be more precisely disposed and the non-active area of the display device can be reduced.