Transparent Heat-Conductive Layer for Display Planarization Stability
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Solution Overview
Problem
Resin-based planarization layers in display panels suffer from shrinkage during thermal processing, leading to decreased blue light transmittance, low color temperature, and yellowing of white light, affecting the intensity and quality of light emission.
Innovation Solution
A display device comprising a base substrate with an organic planarization layer and a transparent electric insulating heat conductive protective layer, which includes a nano silica thin film, positioned to overlap with the light-emitting element, providing heat conductivity, insulation, and transparency to mitigate the effects of thermal processing on the planarization layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin-based planarization layer is used in display panels, then the planarization function is achieved, but the layer shrinks during thermal processing causing decreased blue light transmittance and yellowing
Solution Approach 1:
The patent uses a composite structure consisting of an organic planarization layer combined with an inorganic transparent electric insulating heat conductive protective layer. This composite material approach allows the organic layer to provide planarization while the inorganic layer protects against thermal shrinkage and maintains blue light transmittance, resolving the contradiction between dimensional stability and light transmission quality
2Ease of manufacture
If thermal processing is applied to form subsequent layers, then the manufacturing process is completed, but the planarization layer deforms and shrinks due to heat
Solution Approach 1:
The transparent electric insulating heat conductive protective layer is formed beforehand on the organic planarization layer to serve as a protective barrier. This layer cushions the planarization layer against thermal deformation during subsequent thermal processing steps, enabling manufacturing while preserving the planarization layer's geometric integrity
3Productivity
If the planarization layer is exposed to high temperature during processing, then subsequent layers can be formed, but the color temperature decreases and white light yellows
Solution Approach 1:
The transparent electric insulating heat conductive protective layer acts as an intermediary between the heat source and the organic planarization layer. It conducts heat away from the planarization layer during thermal processing, preventing excessive temperature exposure that would cause yellowing, while still allowing the processing to proceed efficiently
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
The solution effectively reduces blue light loss, increases color temperature, and improves light emission quality by protecting the planarization layer from deformation and heat-induced shrinkage, ensuring better transmittance and color accuracy.
Implementation Method 1
transparent electric insulating heat conductive protective layer
Implementation Method 2
transparent electric insulating heat conductive protective layer comprises a nano silica thin film layer
Data Source
AI summary
A display apparatus (1) and a preparation method therefor. The display apparatus (1) is provided with: a base substrate (10); an organic planarizing layer (20) located on the base substrate (10); a transparent insulation heat-conduction protection layer (30) located at a side, away from the base substrate (10), of the organic planarizing layer (20); and a light-emitting element located at a side, away from the base substrate (10), of the transparent insulation-heat conduction-protection layer (30), wherein an orthographic projection, on the base substrate (10), of the light-emitting element at least partially overlaps with an orthographic projection, on the base substrate (10), of the transparent insulation heat-conduction protection layer (30).