Color Filter UV Shielding for Adhesive Curing Uniformity
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Solution Overview
Problem
The existing color display apparatuses suffer from decreased display quality due to uneven curing of the adhesive, leading to excessive shrinkage and lifting of the periphery area between the display layer and the driving substrate, caused by uneven UV light exposure during the manufacturing process.
Innovation Solution
The color display apparatus design includes a color filter that covers not only the display layer but also an outer area adjacent to it, ensuring even light illumination and curing of the adhesive, thereby preventing excessive shrinkage and maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the color filter is aligned with the driving substrate such that the orthographic projection of the display layer just covers the filter layer periphery boundary, then the manufacturing alignment is simplified, but the adhesive surrounding the periphery boundary receives excessive UV light intensity causing excessive shrinkage and display quality degradation
Solution Approach 1:
The filter layer is designed with different functional zones: a first area covering the display layer for color filtering, and a second area extending beyond the display layer periphery boundary for UV light shielding. This local differentiation allows the adhesive surrounding the display layer to receive reduced UV light intensity, preventing excessive shrinkage while maintaining alignment simplicity.
Solution Approach 2:
The second area of the filter layer acts as an intermediary UV light shielding layer between the UV light source and the adhesive surrounding the display layer periphery boundary. This intermediary structure distributes the UV light intensity more uniformly, preventing the excessive shrinkage caused by direct high-intensity UV exposure.
2Quantity of substance
If the filter layer covers only the display layer area, then the material usage is minimized, but the adhesive surrounding the display layer periphery boundary is exposed to excessive UV light causing periphery lifting and display quality decrease
Solution Approach 1:
The filter layer is designed with different functional zones: a first area covering the display layer for color filtering, and a second area extending beyond the display layer periphery boundary for UV light shielding. This local differentiation allows the filter layer to perform dual functions with minimal material addition.
Solution Approach 2:
The second area of the filter layer provides multi-functionality by serving as both a structural extension of the filter layer and a UV light shielding layer. This allows the same component to protect the adhesive from excessive UV exposure without requiring an additional separate shielding structure.
3Productivity
If UV light is used to cure the adhesive, then the curing process is efficient and fast, but the uneven UV light distribution causes non-uniform adhesive shrinkage and periphery lifting
Solution Approach 1:
The second area of the filter layer acts as an intermediary UV light shielding layer that distributes UV light intensity more uniformly across the adhesive area, particularly reducing intensity in regions surrounding the display layer periphery boundary. This maintains the efficiency of UV curing while achieving uniform shrinkage.
Solution Approach 2:
The filter layer design changes the UV light intensity parameter distribution by extending the filter layer beyond the display layer periphery boundary. This structural modification creates a more uniform UV light intensity distribution across the adhesive, preventing excessive shrinkage while maintaining curing efficiency.
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 design ensures even curing of the adhesive, preventing the periphery area from being lifted and resulting in improved display quality by maintaining uniformity in the adhesive curing process.
Implementation Method 1
the adhesive 130 is cured by ultraviolet (UV) light to fix the color filter 140 to the display layer 120
Data Source
AI summary
A color display apparatus includes a driving substrate, a color filter, a display layer and an adhesive. The color filter is faced to the driving substrate. The color filter includes a substrate and a filter layer, and the filter layer is disposed on the substrate and faced to the driving substrate. The display layer is disposed between the driving substrate and the color filter, and an orthographic projection of the display layer projecting on the filter layer is surrounded by a periphery boundary of the filter layer. An interval is existed between the orthographic projection of the display layer projecting on the filter layer and the periphery boundary of the filter layer. Besides, the adhesive is disposed between the display layer and the color filter, and a periphery boundary of the display layer and the periphery boundary of the filter layer are surrounded by the adhesive.