Display Device Light Selective Filter for Blue Light Reflection
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Solution Overview
Problem
Existing display devices face challenges in enhancing light output efficiency and visibility due to issues with light reflection and color filtering, particularly in managing blue light emission and external light interference.
Innovation Solution
A display device incorporating a light emitting element layer with a light control layer and a light selective filter, where the light control layer includes quantum dots for absorbing and emitting red and green light, and a liquid crystal filter that transmits red and green light while blocking blue light, along with a color filter that absorbs red and green light to enhance blue light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional color filter is used to manage blue light emission, then blue light transmission is improved, but blue light reflection increases causing reduced visibility
Solution Approach 1:
The light selective filter is divided into two distinct functional components: a liquid crystal filter portion that selectively blocks blue light while transmitting red and green light, and a color filter portion that absorbs red and green light while transmitting blue light. This segmentation allows each portion to address specific aspects of light management independently, resolving the contradiction between transmission and reflection.
Solution Approach 2:
Different regions of the filter structure are assigned different optical properties: the liquid crystal filter portion is positioned to handle blue light blocking where reflection occurs, while the color filter portion is positioned to handle blue light transmission where direct emission occurs. This local differentiation of optical quality optimizes both transmission and visibility.
2Manufacturing precision
If multiple separate filters are used to manage different wavelengths, then light control precision is improved, but device complexity increases
Solution Approach 1:
The liquid crystal filter portion and color filter portion are combined into a single integrated light selective filter assembly that is disposed on the light control layer. This merging maintains the precision of wavelength-selective control while reducing the number of separate components and simplifying the overall device structure compared to using multiple independent filters.
Solution Approach 2:
The integrated light selective filter performs multiple functions simultaneously: it controls blue light emission, blocks external blue light, manages red and green light transmission, and prevents color crosstalk. This multi-functionality eliminates the need for separate specialized filters for each wavelength, reducing device complexity while maintaining precision.
3Manufacturing precision
If quantum dots are used for light conversion, then color accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The quantum dots in the light control layer automatically convert blue light from the light emitting elements into red and green light without requiring additional active control mechanisms. This self-conversion property maintains high color accuracy while simplifying the manufacturing process, as the quantum dots passively perform the light conversion function based on their inherent optical 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
This configuration improves light output efficiency and visibility by effectively blocking blue light reflection, reducing external light interference, and allowing for a single coating process, thereby increasing process efficiency and cost-effectiveness.
Implementation Method 1
the first light control part absorbs the blue light and emits a red light, the second light control part absorbs the blue light and emits a green light
Implementation Method 2
the liquid crystal filter transmits the red light and the green light and blocks the blue light
Implementation Method 3
the color filter absorbs the red light and the green light and transmits the blue light
Data Source
AI summary
A display device includes a plurality of light emitting elements which emits a blue light; a light control layer disposed on the light emitting elements and including: a first light control part which absorb the blue light and emits a red light; a second light control part which absorbs the blue light and emits a green light; and a third light control part which transmits the blue light; and a light selective filter disposed on the light control layer. The light selective filter includes a liquid crystal filter and a color filter. The liquid crystal filter transmits red light and green light and blocks blue light. The color filter is absorbs the red light and the green light and transmits the blue light.