OLED Display Device with Stacked Non-Overlapping Light-Emitting Layers
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Solution Overview
Problem
The challenge is to enhance the resolution of organic light-emitting diode (OLED) displays to achieve visually closer natural images, as current technologies face limitations in achieving high resolution while maintaining other desirable features like power efficiency and wide viewing angles.
Innovation Solution
A display device architecture is introduced, comprising multiple substrates and light-emitting layers with non-overlapping light-emitting elements, including blue, green, and red layers, which are strategically positioned to optimize light transmittance and extend the device's lifetime through a time division driving technique.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light-emitting layers are stacked in the same pixel area, then color gamut is improved, but light transmittance decreases due to overlapping layers
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of light-emitting layers to a three-dimensional stacked arrangement across multiple substrates. By distributing light-emitting layers of different colors (blue, green, red) on separate substrates stacked in the vertical direction, the patent enables full-color display while maintaining light transmittance, as the light-emitting layers no longer overlap in the horizontal plane but are separated in the vertical dimension.
2Adaptability or versatility
If certain light-emitting layers are used to achieve full-color display, then color quality is improved, but device lifetime is reduced due to limited stability of organic light-emitting materials
Solution Approach 1:
The patent implements time-division multiplexing where different subsets of light-emitting elements are activated in alternating time periods. Specifically, during first time periods, blue and green light-emitting elements are driven while red elements are off; during second time periods, red and green light-emitting elements are driven while blue elements are off. This periodic activation pattern reduces cumulative degradation of individual light-emitting layers, thereby extending overall device lifetime while maintaining perceived full-color display through temporal integration.
3Measurement precision
If resolution is increased by reducing pixel size, then image quality is improved, but manufacturing precision requirements increase significantly
Solution Approach 1:
The patent divides the display device into multiple independent substrate layers, each containing a subset of light-emitting elements. This segmentation allows each substrate to be manufactured and tested independently before assembly, reducing the overall manufacturing precision requirements. The separation of blue, green, and red light-emitting layers onto different substrates enables modular fabrication processes and simplifies alignment requirements compared to manufacturing all color layers simultaneously in a single pixel structure.
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 the resolution and light transmittance of OLED displays while extending their lifespan by utilizing a time division driving method that mitigates the limited lifetime of certain light-emitting layers.
Implementation Method 1
the first light-emitting element layer includes a first light-emitting element electrically connected to the first active element and including a first light-emitting layer
Data Source
AI summary
A display device is provided. The display device includes a first substrate, a first element layer, a first light-emitting element layer, a second substrate, a second element layer, and a second light-emitting element layer. The first element layer is disposed on the first substrate and includes a first active element. The first light-emitting element layer is disposed on the first element layer and includes a first light-emitting element, the first light-emitting element is electrically connected to the first active element and includes a first light-emitting layer. The second substrate is disposed on the first light-emitting element. The second element layer is disposed on the second substrate and includes a second active element. The second light-emitting element layer is disposed on the second element layer and includes a second light-emitting element, the second light-emitting element is electrically connected to the second active element and includes a second light-emitting layer. The first light-emitting layer and the second light-emitting layer do not overlap with each other in the normal direction of the first substrate.