Thermal Insulation Layer for Display Device Heat Management
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Solution Overview
Problem
Display devices with heat dissipation layers fail to effectively prevent deterioration of light-emitting elements in hot environments, such as inside a car, due to inadequate heat management.
Innovation Solution
Incorporating a thermal insulation layer composed of a cellulosic resin and a metal oxide or metal carbonyl compound in the display device to insulate the light-emitting elements against heat, which is formed using a process that includes ink-jet printing and firing to achieve a suitable thickness and dispersion of the metal oxide or metal carbonyl compound within the cellulosic resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat dissipation layer is provided on the surface of the support substrate, then heat dissipation is improved, but the light-emitting element still deteriorates due to heat generated by itself
Solution Approach 1:
Instead of using a heat dissipation layer that conducts heat away from the light-emitting element, the patent applies thermal insulation layers that block heat from reaching the element from both the front surface (above the electrode) and the back surface (below the substrate). This inverted approach of blocking heat paths rather than dissipating them resolves the contradiction by preventing the element's self-generated heat from causing deterioration.
Solution Approach 2:
The patent applies different thermal insulation treatments to different locations: a first thermal insulation layer is applied to the front surface above the electrode, and a second thermal insulation layer is applied to the back surface below the substrate. This localized quality control addresses the specific heat paths affecting the light-emitting element at different positions, resolving the contradiction between heat dissipation and element protection.
2Reliability
If a thermal insulation layer containing cellulosic resin and metal oxide is applied, then light-emitting element deterioration is retarded, but manufacturing complexity increases
Solution Approach 1:
The patent uses the same base material (cellulosic resin) for both the first and second thermal insulation layers, applying it to different surfaces for different protective functions. This multi-functional use of a single material system reduces overall complexity while maintaining effective thermal insulation at both the front and back surfaces, protecting the light-emitting element comprehensively.
Solution Approach 2:
The patent specifies particular compositional parameters for the thermal insulation layers (cellulosic resin with specific metal oxides or carbonyl compounds in defined weight ratios) to optimize thermal insulation performance. By controlling these material parameters rather than structural complexity, the patent achieves reliable element protection without excessive device complexity.
3Temperature
If the thermal insulation layer is made thicker to improve insulation, then heat resistance is improved, but transmittance decreases
Solution Approach 1:
The patent optimizes the thickness and compositional parameters of the thermal insulation layers to achieve the right balance. By controlling the weight ratio of metal oxide to cellulosic resin (0.1-10 wt%) and the layer thickness appropriately, the patent maintains sufficient thermal insulation while preserving adequate light transmittance for display functionality.
Solution Approach 2:
The patent creates composite thermal insulation layers combining cellulosic resin with specific metal oxides or carbonyl compounds. This composite structure provides effective thermal insulation at optimized thicknesses while maintaining optical transparency, resolving the contradiction between heat resistance and transmittance through material composition rather than sheer thickness.
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 thermal insulation layer effectively retards the deterioration of light-emitting elements by maintaining their brightness and heat resistance, even under high temperatures, while maintaining display characteristics and transmittance.
Implementation Method 1
at least one thermal insulation layer. The thermal insulation layer containing: a cellulosic resin; and a metal oxide or a metal carbonyl compound
Data Source
AI summary
A display device includes: a substrate; a TFT layer provided on the substrate; a light-emitting element layer provided on the TFT layer and including a plurality of light-emitting elements; and at least one thermal insulation layer, the thermal insulation layer containing: a cellulosic resin; and a metal oxide or a metal carbonyl compound.