Display Apparatus Color Filter and Quantum Dot Layer Optimization
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Solution Overview
Problem
Conventional display apparatuses have low optical efficiency due to the design of their color conversion units, which affects the emission and extraction of light for full-color displays.
Innovation Solution
The display apparatus includes a lower substrate with light-emitting devices, an upper substrate with color filter layers, and quantum dot layers, where the color filter layers and quantum dot layers are strategically positioned and shaped to optimize light extraction, with specific openings and bank structures that enhance light conversion and emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional color conversion units are used in display apparatus, then full-color display is achieved, but optical efficiency is low
Solution Approach 1:
The patent divides the color filter layer into multiple segments (first color filter layer and second color filter layer) with different opening patterns. The first color filter layer has first openings while the second color filter layer has second openings that are positioned differently, allowing light to pass through at least one layer. This segmentation enables selective light transmission to improve optical efficiency while maintaining full-color display capability.
Solution Approach 2:
The patent applies different opening patterns to different regions of the color filter layers. Specifically, the first color filter layer and second color filter layer have openings positioned at different locations, creating local variations in light transmission properties. This allows each region to optimize light passage according to its specific function, thereby improving overall optical efficiency without compromising display quality.
2Illumination intensity
If color filter layers with openings are used to improve light extraction, then optical efficiency increases, but external light reflection increases
Solution Approach 1:
The patent introduces an intermediate solution where the color filter layers with strategically positioned openings serve as mediators. The openings are designed to allow internally generated light to pass through while the surrounding filter material blocks externally reflected light. This intermediary structure selectively transmits desired light while filtering out harmful reflections, resolving the contradiction between light extraction and reflection control.
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 increases optical efficiency by minimizing the length of light extraction region edges while maintaining consistent area, resulting in improved light emission and reduced external light reflection, thereby enhancing the display's overall performance.
Implementation Method 1
a first-color quantum dot layer filling the second opening
Implementation Method 2
a second-color color filter layer on a lower surface of the upper substrate
Data Source
AI summary
A display apparatus includes an upper substrate including a first area corresponding to a first light-emitting device; a second-color color filter layer on a lower surface of the upper substrate and including a first opening exposing the first area; a first-color color filter layer including a portion filling the first opening and a portion on a lower surface of the second-color color filter layer; a bank between the first-color and second-color color filter layers and a lower substrate, the bank including a second opening corresponding to the first area; and a first-color quantum dot layer filling the second opening, wherein the second opening includes a portion overlapping the first opening and a portion outside the first opening in a plan view.