Display Apparatus Pixel Electrode Segmentation for Light Efficiency
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Solution Overview
Problem
Display apparatuses have low light efficiency due to limitations in color conversion and emission layer configurations, leading to suboptimal full-color image display.
Innovation Solution
The display apparatus incorporates a configuration with multiple pixel electrodes, emission layers, quantum dot layers, and color filter layers, where the first emission layer emits light in a first wavelength band, the second emission layer emits light in a second wavelength band, and the quantum dot layer converts light from the second wavelength band to a third wavelength band, with a bank isolating openings to prevent material mixing and enhance light conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a color converting unit is used to convert light from one color to another, then full-color display is achieved, but light efficiency deteriorates
Solution Approach 1:
The display device divides the pixel structure into multiple separate pixel electrodes (first, second, third pixel electrodes) with distinct openings, allowing independent control and optimization of each sub-pixel region. This segmentation enables precise placement of emission layers and quantum dot layers in specific openings while leaving other openings clear for direct light transmission, thereby maintaining high light efficiency while achieving full-color display capability.
Solution Approach 2:
Different regions of the pixel structure are assigned different functions: the first opening contains emission layers for light emission, the second opening contains quantum dot layers for wavelength conversion, and the third opening remains open for direct light transmission. This local differentiation optimizes light efficiency in each region while collectively achieving full-color display performance.
2Manufacturing precision
If multiple emission layers and quantum dot layers are added to improve color conversion, then full-color image quality improves, but device complexity increases
Solution Approach 1:
The complex multi-layer structure is segmented and distributed across three separate pixel electrodes with distinct openings. Each opening contains only the necessary layers for its specific function, avoiding the need to stack all layers in every pixel region. This segmentation simplifies the local structure while maintaining the overall full-color capability through coordinated operation of the three pixel electrodes.
Solution Approach 2:
Instead of stacking all emission and quantum dot layers vertically in a single pixel region, the invention distributes them horizontally across three separate openings in the pixel defining layer. This spatial distribution in the planar dimension reduces vertical stacking complexity while achieving the same full-color conversion function through parallel processing in different spatial locations.
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 significantly improves light efficiency by allowing for high-quality full-color image display, preventing degradation in light conversion efficiency and ensuring effective wavelength conversion, particularly from the second to the third wavelength band, while maintaining efficient emission of the first wavelength band.
Implementation Method 1
a first quantum dot layer disposed on a lower surface of the upper substrate toward the lower substrate, and overlapping the third pixel electrode in view of a direction perpendicular to the upper substrate, the first quantum dot layer converting light having a wavelength belonging to the second wavelength band, into light of a wavelength belonging to a third wavelength band
Data Source
AI summary
A display apparatus includes a lower substrate, a first pixel electrode, a second pixel electrode, and a third pixel electrode that are disposed apart from each other on the lower substrate, a pixel defining layer overlapping an edge of each of the first pixel electrode, the second pixel electrode, and the third pixel electrode, the pixel defining layer including a first opening exposing a center portion of the first pixel electrode, a second opening exposing a center portion of the second pixel electrode, and a third opening exposing a center portion of the third pixel electrode, and a bank disposed on the pixel defining layer and isolating the first opening from the second opening and the third opening.