Display Device Planarization Layer Flatness via Transmissive Intermediary
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Solution Overview
Problem
Display devices with irregularities in the planarization layer surface height affect optical characteristics and performance, leading to poor image quality due to component separation and misalignment.
Innovation Solution
A display device with a planarization layer having reduced surface height variations, achieved by forming a transmissive layer with a sub-transmissive layer between wavelength conversion layers and a polarizing layer, which improves adherence and flatness, thereby enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional multi-layer structure is used without additional transmissive layers, then the device construction is simpler, but the planarization layer surface exhibits height irregularities affecting optical characteristics
Solution Approach 1:
A transmissive layer is introduced as an intermediary between the color conversion layer and the planarization layer. This intermediate layer fills in surface irregularities and provides a flat upper surface, thereby improving planarization layer flatness without requiring changes to the underlying color conversion layer structure.
Solution Approach 2:
The solution addresses the surface height problem by adding a layer in the vertical dimension rather than attempting to flatten the existing layers. The transmissive layer compensates for height variations in the color conversion layer by providing additional material thickness, achieving overall flatness through dimensional addition.
2Reliability
If layers are adhered together in a conventional manner, then the manufacturing process is simpler, but component separation occurs leading to poor image quality
Solution Approach 1:
The transmissive layer is constructed with multiple sub-layers having different material properties. The first sub-transmissive layer and second sub-transmissive layer are made of different materials, creating a composite structure that provides both adhesion to underlying layers and flatness on the upper surface, thereby improving component adherence.
Solution Approach 2:
Different regions of the transmissive layer have different material compositions tailored to specific functions. The first sub-transmissive layer near the color conversion layer uses materials optimized for adhesion, while the second sub-transmissive layer uses materials optimized for providing a flat surface, with each region having locally optimized properties.
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 results in improved image quality by reducing component separation and enhancing the flatness of the planarization layer, leading to better adherence and optical characteristics.
Implementation Method 1
the first wavelength conversion layer may be configured to receive a light of a first wavelength range and to convert the light of the first wavelength range into a light of a second wavelength range different from the first wavelength range
Implementation Method 2
the second wavelength conversion layer may be configured to receive the light of the first wavelength range and to convert the light of the first wavelength range into a light of a third wavelength range different from the second wavelength range
Implementation Method 3
The transmissive layer may be configured to transmit the light of the first wavelength range
Implementation Method 4
a first filter configured to block the light of the first wavelength range and to transmit the light of the second wavelength range and the light of the third wavelength range
Implementation Method 5
a second filter configured to block the light of the first wavelength range and to reflect the light of the second wavelength range and the light of the third wavelength range
Data Source
AI summary
A display device including a first substrate, a pixel disposed on the first substrate and including first, second and third sub-pixel electrodes adjacent to each other, a second substrate spaced from the first substrate, a color conversion layer disposed on the second substrate and with a first wavelength conversion layer overlapping with the first sub pixel electrode and a second wavelength conversion layer overlapping with the second sub pixel electrode, a transmissive layer including a first sub-transmissive layer overlapping with the third sub-pixel electrode and a second sub-transmissive layer disposed between the first wavelength conversion layer and the second wavelength conversion layer, and a planarization layer disposed on the color conversion layer and the transmissive layer. A method of manufacturing a display device having a flatter planarization layer with reduced variations in thickness is also disclosed.