Display Panel Light Filtering Structure Embedded in Insulating Layer
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Solution Overview
Problem
Display panels with a color resisting block formed on a passivation layer at the outermost side of a TFT for light emitting diodes suffer from a high height difference, leading to unnecessary color mixing and reduced color display effectiveness due to light leakage between pixel units.
Innovation Solution
The display panel incorporates a driving and light filtering structure with a color resisting block disposed in an accommodating hole penetrating through an insulating layer, allowing for a reduced height difference and the use of a thinner planarization layer, which minimizes light leakage and color mixing by positioning the light filtering part alongside the driving part rather than above it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the color resisting block is formed on the passivation layer at the outermost side of the TFT, then the color resisting block can be easily manufactured, but the height difference between pixel units increases causing light leakage and color mixing
Solution Approach 1:
The patent transitions the color resisting block from a surface-level structure to an embedded structure by creating an accommodating hole through the insulating layer and positioning the color resisting block within this hole. This dimensional change from surface-mounted to embedded positioning reduces the height difference between adjacent pixel units, thereby minimizing light leakage and color mixing while preserving manufacturing feasibility through standardized hole formation processes.
Solution Approach 2:
The color resisting block is nested within the accommodating hole formed in the insulating layer, creating a hierarchical structure where the color resisting block is contained within the insulating layer rather than sitting on its surface. This nesting approach reduces the overall height profile of the pixel unit structure, preventing light from leaking between adjacent pixels and improving color display precision.
2Manufacturing precision
If a thicker planarization layer is used to reduce height difference, then light leakage and color mixing are reduced, but the display panel becomes thicker and heavier
Solution Approach 1:
Instead of increasing the vertical thickness of the planarization layer to reduce height differences, the patent embeds the color resisting block within the insulating layer by creating an accommodating hole. This approach addresses the height difference problem in the vertical dimension by repositioning the color resisting block downward into the hole, thereby eliminating the need for additional planarization layer thickness while maintaining color display effectiveness.
Solution Approach 2:
By nesting the color resisting block within the accommodating hole of the insulating layer, the patent reduces the overall vertical profile of the pixel unit structure. This nesting eliminates the need for thick planarization layers that would otherwise be required to compensate for height differences, thus reducing panel thickness and weight while maintaining color accuracy.
3Ease of manufacture
If the color resisting block is positioned above the driving part, then the structure is simpler to manufacture, but light leakage occurs between pixel units reducing color accuracy
Solution Approach 1:
The patent repositions the color resisting block from a surface-level location above the driving part to an embedded location within the insulating layer by creating an accommodating hole. This dimensional repositioning maintains manufacturing simplicity through standardized hole formation processes while effectively preventing light leakage between pixel units, thereby improving color accuracy without significantly complicating the manufacturing process.
Solution Approach 2:
The color resisting block is nested within the accommodating hole of the insulating layer, creating a contained structure that prevents light from escaping between adjacent pixel units. This nesting approach maintains structural simplicity by using the existing insulating layer as the containing structure, while simultaneously improving color accuracy by eliminating light leakage paths.
Data Source
AI summary
Provided are a display panel and a manufacturing method thereof and a display device. The display panel includes a substrate and pixel units formed on the substrate, wherein, along a thickness direction of the display panel, at least one of the pixel units includes a driving and light filtering structure and a light emitting element formed at a side of the driving and light filtering structure facing away from the substrate, and wherein the driving and light filtering structure includes a driving part and a light filtering part, and the light filtering part is disposed in an accommodating hole penetrating through an insulating layer in the driving part along the thickness direction.