Quantum Dot Display Uniformity via Segmented Bank and Bonding
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Solution Overview
Problem
Display apparatuses often fail to emit light with uniform color coordinates and luminance across different pixel positions, leading to suboptimal image quality.
Innovation Solution
The display apparatus incorporates a first and second quantum dot layer, a dummy quantum dot layer, and a bonding member, with specific opening configurations in the bank to ensure uniform light emission and improved image quality, along with an overcoat layer and filler to enhance light conversion and shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If quantum dot layers are added to convert light wavelengths, then color quality and uniformity are improved, but device complexity increases
Solution Approach 1:
The patent divides the quantum dot layer into multiple segments with different wavelength conversion properties. The first quantum dot layer converts to a first wavelength band, the second quantum dot layer converts to a second wavelength band, and the third quantum dot layer converts to a third wavelength band. This segmentation allows precise control over color coordinates across different pixel positions, resolving the contradiction between color uniformity and structural complexity by organizing complexity into functional segments.
Solution Approach 2:
The patent applies local quality by positioning different quantum dot layers at specific locations: the first quantum dot layer is positioned to overlap the first pixel electrode, the second quantum dot layer overlaps the second pixel electrode, and the third quantum dot layer is positioned in the peripheral area. Each location receives tailored wavelength conversion to achieve uniform color coordinates across the display area, while the peripheral area quantum dot layer specifically addresses edge uniformity issues.
2Use of energy by moving object
If additional openings are defined in the bank for quantum dot layers, then light conversion efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The bank structure is designed with multiple openings that serve multiple functions: the first opening allows light from the first pixel electrode to reach the first quantum dot layer, the second opening allows light from the second pixel electrode to reach the second quantum dot layer, and the third opening allows light from the peripheral area to reach the third quantum dot layer. This multi-functional bank design improves light conversion efficiency across different regions while maintaining a single unified structure that reduces manufacturing complexity.
Solution Approach 2:
The patent resolves alignment precision issues by transitioning from a two-dimensional planar alignment problem to a three-dimensional spatial arrangement. The quantum dot layers are positioned at different heights and locations, with the first and second quantum dot layers overlapping respective pixel electrodes, and the third quantum dot layer positioned in the peripheral area. This dimensional arrangement allows each opening to be optimized for its specific function while reducing the overall alignment precision requirements.
3Strength
If bonding members are positioned to overlap additional openings, then substrate bonding strength is improved, but light emission uniformity may be affected
Solution Approach 1:
The patent extracts the bonding function from the main display area by positioning bonding members in the peripheral area where the third quantum dot layer is located. The bonding members overlap the third additional opening defined in the bank, separating the bonding function from the light emission function. This extraction allows strong substrate bonding without interfering with the uniformity of light emission from the first and second quantum dot layers in the display area.
Solution Approach 2:
The third quantum dot layer in the peripheral area acts as an intermediary element between the bonding members and the display area. It allows the bonding members to be positioned in the peripheral area while maintaining light conversion functionality, serving as a mediator that enables both strong bonding and uniform light emission without direct conflict between these two requirements.
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 ensures consistent color coordinates and luminance across pixels, resulting in high-quality images by optimizing light conversion and shielding external interference.
Implementation Method 1
the first quantum dot layer may convert light having a wavelength in the first wavelength band and passing through the first quantum dot layer into light having a wavelength in a second wavelength band
Implementation Method 2
the second quantum dot layer may convert light having a wavelength in the first wavelength band and passing through the second quantum dot layer into light having a wavelength in a third wavelength band
Data Source
AI summary
A display apparatus includes: a first pixel electrode in a display area; a pixel defining layer with a first pixel opening defined in the pixel defining layer exposing a center of the first pixel electrode; an emission layer over the first pixel electrode and configured to emit light in a first wavelength band; an opposite electrode over the emission layer; a second substrate over the first substrate such that the opposite electrode is between the first substrate and the second substrate; a bank over a bottom surface of the second substrate in a direction to the first substrate, a first opening defined in the bank overlapping with the first pixel opening and a first additional opening defined in the bank overlapping with the peripheral area, a first quantum dot layer in the first opening; and a bonding member bonding the first substrate and the second substrate to each other.