Display Panel Adhesive Dam Structure for Edge Light Transmission
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Solution Overview
Problem
Existing electronic devices with display panels face challenges in providing normal light emission near the periphery due to the coverage of the display area by light blocking parts, resulting in a reduced display area size.
Innovation Solution
The implementation of an adhesive group comprising a first and second adhesive dam and an adhesive layer with varying heights and degrees of cure, along with a window member, to minimize light blocking and maximize the display area by optimizing the structure and curing process of the adhesive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single adhesive layer is used to attach the window member to the display panel, then the manufacturing process is simple, but light distortion occurs at the periphery and the display area is reduced
Solution Approach 1:
The adhesive layer is divided into multiple adhesive layers with different heights (first adhesive layer with height H1, second adhesive layer with height H2 where H2 > H1). This segmentation allows different regions to serve different functions: the first adhesive layer provides base adhesion while the second adhesive layer compensates for surface irregularities and reduces light distortion at the periphery, thereby improving light transmission quality without complicating the manufacturing process excessively
Solution Approach 2:
Different regions of the adhesive structure are given different properties - the second adhesive layer is positioned to have greater height specifically at regions where light distortion occurs (near the periphery), while the first adhesive layer provides uniform base coverage. This local variation in adhesive height optimizes light transmission at critical areas without requiring complete redesign of the entire adhesive structure
2Strength
If light blocking parts are used to attach the window member, then the attachment is secure, but the display area size is reduced
Solution Approach 1:
The adhesive material properties are optimized to achieve sufficient attachment strength without requiring extensive coverage area. By adjusting adhesive parameters (viscosity, curing characteristics, bonding strength), the adhesive can provide secure attachment with minimal coverage, thereby maximizing the display area while maintaining attachment strength
Solution Approach 2:
The use of optically clear adhesive materials with specific optical properties (refractive index matching, transparency) allows the adhesive to serve dual functions: providing mechanical attachment strength while simultaneously maintaining optical clarity to prevent light distortion and maximize the effective display area
3Ease of manufacture
If the adhesive layer height is uniform across the display panel, then the manufacturing process is simple, but light distortion occurs at the edges
Solution Approach 1:
The adhesive structure is segmented into multiple layers with different heights - the first adhesive layer provides uniform base coverage while the second adhesive layer is applied selectively to regions requiring additional height compensation. This segmentation approach balances manufacturing simplicity with optical performance, as the multi-layer structure can be applied using standard coating techniques
Solution Approach 2:
The solution moves from a two-dimensional uniform adhesive layer to a three-dimensional multi-layer adhesive structure with varying heights. By adding the height dimension, the adhesive can compensate for surface irregularities and optical path differences at the edges, improving light transmission without significantly complicating the manufacturing process
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 allows for reduced light distortion at the edges of the display panel, enabling a larger display area with improved light transmission and reduced light blocking, enhancing the overall display performance.
Implementation Method 1
Optically clear adhesives and optically clear resins are examples of adhesives allowing transmission of visible light
Implementation Method 2
configured to provide light emitted near a periphery of a display panel more normally
Implementation Method 3
each of the first adhesive dam, the second adhesive dam and the adhesive layer may include a photocurable material
Data Source
AI summary
An electronic device according to an embodiment of the present disclosure includes a display panel, an adhesive group and a window member. The adhesive group is disposed on the display panel defined with a display area and a non-display area surrounding at least a portion of the display area. The window member is disposed on the adhesive group. The adhesive group includes a first adhesive dam, a second adhesive dam and an adhesive layer. The first adhesive dam has at least a portion overlapping with the non-display area. The second adhesive dam covers a portion of the first adhesive dam and has at least a portion overlapping with the non-display area. The adhesive layer covers a portion of the first adhesive dam and a portion of the second adhesive dam and overlaps with the display area. The display area and the window member are attached by the adhesive group.