Display Panel Recess Sealant Design for Thin Layer Sealing
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Solution Overview
Problem
Designing display panels with thin display medium layers poses challenges in maintaining structural integrity and optical properties, as existing sealants may not provide sufficient sealing with low compressibility, especially when the thickness of the display medium layer is smaller than 2 μm.
Innovation Solution
Incorporating a recess in one or both substrates to house a sealant, which is thicker than the distance between the substrates in certain regions, allowing for the use of less compressible materials and ensuring effective sealing while accommodating thin display medium layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a thin display medium layer is used, then the optical properties are improved, but the sealing reliability deteriorates
Solution Approach 1:
The substrate surface is segmented into a recess region and a non-recess region. The sealant is specifically placed in the recess, separating the sealing function from the display medium layer region. This segmentation allows the sealant to have sufficient thickness for reliable sealing while the display medium layer remains thin for optimal optical properties.
Solution Approach 2:
The invention transitions from a planar sealant arrangement to a three-dimensional structure by creating a recess. The sealant is positioned at a lower elevation than the display medium layer, utilizing the vertical dimension. This dimensional change enables the sealant to achieve adequate thickness for sealing reliability without increasing the overall profile height in the display region.
2Reliability
If the sealant thickness is increased, then the sealing reliability is improved, but the overall device thickness increases
Solution Approach 1:
The recess is created only in the peripheral region where the sealant is located, not across the entire substrate. This localized modification allows the sealant to have increased thickness where needed for sealing reliability, while the central display region maintains its thin profile for optimal optical performance and overall device thinness.
Solution Approach 2:
The substrate surface is divided into functional zones: a recess region for the sealant and a non-recess region for the display medium layer. This segmentation enables differential thickness control, allowing the sealant to be thicker for reliability while keeping the overall device thickness minimal in the display area.
3Reliability
If a recess is created in the substrate, then the sealant thickness is increased, but the substrate structure becomes more complex
Solution Approach 1:
The recess is formed in the substrate before the sealant is applied. This preliminary structuring of the substrate simplifies the subsequent sealant application process, as the sealant simply needs to be placed in the pre-formed recess rather than requiring complex application techniques to achieve the desired thickness profile.
Solution Approach 2:
The recess is created only in the specific peripheral region where sealing is needed, rather than modifying the entire substrate. This localized structural modification minimizes the increase in device complexity while achieving the necessary sealant thickness for reliable sealing.
Data Source
AI summary
A display panel may have a first region and a second region encircled by the first region. The display panel may include first substrate, second substrate, sealant, conductive layer, and display medium layer. The first substrate may have a first recess in the first region. The second substrate may be disposed opposite to the first substrate. The sealant may be disposed between the first and second substrates, and may be received by the first recess. The conductive layer may be disposed on the first substrate, cover the first recess in a conformal manner, and be interposed between the first substrate and the sealant. The display medium layer may be disposed between the first and second substrates and may be encircled by the sealant. A thickness of the sealant may be larger than a distance between the first substrate and the second substrate in the second region.