Display Pixel Opening Geometry for Quantum Dot Light Efficiency
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Solution Overview
Problem
Conventional display apparatuses with color conversion units suffer from low light efficiency, which hinders the display of high-quality images.
Innovation Solution
The display apparatus includes a specific design with a quantum dot layer or light-transmitting layer within bank openings and filter openings, where the distances and areas of these openings are optimized to enhance light conversion efficiency, with ratios and distances between edges carefully controlled to improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a color conversion unit is used to emit light of different colors, then color display capability is improved, but light efficiency deteriorates
Solution Approach 1:
The patent applies local quality by creating different optical path configurations for different regions. The bank opening area is specifically designed to be larger than the pixel opening area, and the filter opening area is specifically designed to be larger than the pixel opening area, allowing optimized light conversion in specific regions while maintaining overall color display performance
Solution Approach 2:
The patent introduces dimensional changes by defining specific area relationships between openings at different levels. The bank opening area, filter opening area, and pixel opening area are configured with specific dimensional relationships to optimize light efficiency while maintaining color conversion functionality
2Loss of energy
If the bank opening area is increased to improve light conversion, then light efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the bank and filter openings to serve multiple functions. The bank opening with area larger than pixel opening serves both as a structural element and as a light conversion optimization element. Similarly, the filter opening serves both filtering and light efficiency enhancement functions through its specific area configuration
3Adaptability or versatility
If the filter opening area is increased to enhance color conversion, then color accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by establishing specific area relationship parameters between different openings. The bank opening area is set to be larger than the pixel opening area, and the filter opening area is set to be larger than the pixel opening area, creating optimized parameter configurations that improve color conversion while providing clear manufacturing guidelines
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 design enhances light efficiency and enables the display of high-quality images by optimizing the distances and areas of the bank and filter openings, improving color conversion and overall image quality.
Implementation Method 1
a quantum dot layer or a light-transmitting layer disposed in the bank opening defined by the bank
Data Source
AI summary
A display apparatus includes a pixel-defining layer defining a pixel opening exposing a central portion of a pixel electrode; an opposite electrode disposed over the pixel-defining layer; a bank over the opposite electrode and defining a bank opening overlapping the pixel opening; and a filter-defining layer disposed over the bank and defining a filter opening overlapping the pixel opening. A distance between an upper surface of a portion of the opposite electrode overlapping the pixel opening and a lower surface of the quantum dot layer or the light-transmitting layer is defined as a first distance, a distance between an edge of the filter opening and an edge of the pixel opening in the plan view is defined as a second distance, and a ratio of the second distance to the first distance is greater than or equal to 0.625 and less than or equal to 1.