Black Matrix Projection for UV Curing Frame Sealant
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Solution Overview
Problem
In display devices with narrow bezels, the blockage of UV light by driver circuits and wirings on the array substrate prevents complete curing of the frame sealant, leading to decreased adhesiveness and potential liquid crystal leakage due to sealant breakage.
Innovation Solution
The black matrix is arranged on the second substrate in a way that its projection on the first substrate does not overlap with the frame sealant's projection, ensuring the frame sealant is fully exposed to UV light for curing, and optionally, a polarizing material or sheet with a perpendicular deflection angle is used to enhance curing efficiency and prevent light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the black matrix is coated on the second substrate to block light leakage, then light leakage is prevented, but UV light for curing the frame sealant is blocked by driver circuits and wirings on the first substrate
Solution Approach 1:
The patent changes the spatial arrangement by making the black matrix's projection on the first substrate non-overlapping with the frame sealant's projection. This dimensional repositioning allows UV light to reach the frame sealant without being blocked by the black matrix, while still maintaining light leakage prevention in the display area.
Solution Approach 2:
The black matrix is selectively positioned to have different spatial relationships with different components: it blocks light in the display area (where it overlaps with the display region) but does not block UV light to the frame sealant (where its projection does not overlap). This local differentiation resolves the contradiction between light blocking and UV curing.
2Object-affected harmful factors
If the black matrix projection overlaps with the frame sealant projection, then light leakage is prevented, but the frame sealant cannot be completely cured due to UV light blockage
Solution Approach 1:
The patent resolves this contradiction by changing the spatial projection relationship in the planar dimension. The black matrix is positioned such that its projection on the first substrate does not overlap with the frame sealant's projection, creating a UV light transmission path while maintaining light leakage prevention through the black matrix's presence in the display area.
Solution Approach 2:
The patent segments the functional roles: the black matrix handles light leakage prevention in the display area, while the frame sealant area remains clear for UV curing. This functional segmentation allows both light blocking and complete curing to occur without interference.
3Length of moving object
If driver circuits and wirings are placed densely to achieve narrow bezel, then bezel width is reduced, but UV light blockage to frame sealant is intensified
Solution Approach 1:
The patent extracts the light blocking function from the driver circuit area by positioning the black matrix specifically. The black matrix is placed to block light leakage without interfering with UV light transmission to the frame sealant, separating the light blocking function from the driver circuit region and allowing dense circuit placement for narrow bezel.
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 arrangement improves the curing efficiency of the frame sealant, increases its adhesiveness, and prevents liquid crystal leakage, allowing for denser placement of driver circuits and wirings, resulting in a narrower bezel and reduced light leakage.
Implementation Method 1
UV light 110 is irradiated from the first substrate 101 comprising thin film transistors to cure the frame sealant 102
Implementation Method 2
the frame sealant comprises a polarizing material, and a deflection angle of the polarizing material is perpendicular with a deflection angle of the polarizing sheet
Data Source
AI summary
A display panel and a method for fabricating the same are disclosed. The display panel includes a first substrate, a second substrate which is arranged oppositely to the first substrate, a frame sealant which is arranged between the first substrate and the second substrate, and a black matrix which is arranged on the second substrate. A projection of the black matrix on the first substrate does not overlap a projection of the frame sealant on the first substrate. This facilitates completely exposing the frame sealant to a curing UV light. This improves a curing efficiency of the frame sealant, increases the adhesiveness of the frame sealant, and avoids the problem of liquid crystal leakage due to breakage of the frame sealant.