Partition Wall Segmentation for Light Extraction and Color Separation
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Solution Overview
Problem
Current display devices face challenges in achieving improved display efficiency and reliability due to limitations in light control patterns and manufacturing methods, particularly in effectively scattering light and preventing color mixing between pixel regions.
Innovation Solution
A display device with a color conversion member featuring partition walls and a light control layer that includes a scattering body and a liquid repellent, where the partition walls have distinct sub-layers with varying light transmittance and compositions to enhance light extraction efficiency and prevent color mixing, combined with a manufacturing method that involves precise coating and development processes to form these structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a partition wall with scattering body is used to prevent color mixing, then color quality improves, but light transmittance decreases
Solution Approach 1:
The partition wall is divided into two functional sub-layers: a first sub-partition wall containing scattering bodies and pigments for color separation, and a second sub-partition wall with high light transmittance for light extraction. This segmentation allows each layer to specialize in one function, resolving the contradiction between color quality and light transmittance.
Solution Approach 2:
Different regions of the partition wall structure are assigned different optical properties. The first sub-partition wall has scattering and absorbing properties for color control, while the second sub-partition wall has high transmittance for light extraction. This local differentiation of properties enables simultaneous achievement of color quality and light efficiency.
2Productivity
If a scattering body is added to the partition wall to improve light extraction, then light extraction efficiency improves, but manufacturing precision becomes more difficult
Solution Approach 1:
A preliminary first sub-partition wall pattern is formed first, then a second sub-partition wall material is coated over it. This preliminary action allows the scattering structure to be established before adding the liquid repellent layer, ensuring both light extraction functionality and manufacturing precision.
Solution Approach 2:
The partition wall uses composite material structures: the first sub-partition wall combines scattering bodies with base resin, and the second sub-partition wall combines liquid repellent with base resin. These composite materials provide both the desired optical functions and manufacturability through established coating processes.
3Reliability
If the partition wall height is increased to improve color separation, then color quality improves, but device complexity increases
Solution Approach 1:
Instead of increasing the height of a single partition wall, the structure segments the partition wall into two horizontal sub-layers with different functions. This segmentation achieves color separation through material composition rather than height, reducing structural complexity while maintaining color quality.
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 significantly improves light extraction efficiency and display reliability by optimizing light transmittance and preventing color mixing, leading to enhanced color quality and process accuracy in the display device.
Implementation Method 1
a first sub partition wall (BK1) including a scattering body (SP)
Implementation Method 2
a second sub partition wall (BK2) disposed on the first sub partition wall (BK1), including a liquid repellent (LRP)
Implementation Method 3
first quantum dots which convert the first color light to second color light having a longer wavelength range than the first color light
Data Source
AI summary
A display device includes a display panel, and a color conversion member disposed on the display panel. The color conversion member includes a plurality of partition walls disposed on the display panel and spaced apart from each other, and a color control part disposed between the plurality of partition walls. Each of the plurality of partition walls includes a first sub partition wall including a scattering body, and a second sub partition wall disposed on the first sub partition wall, and including a liquid repellent. The second sub partition wall has a higher light transmittance than the first sub partition wall.