OLED Array Substrate Segmented Light Emitting Units
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Solution Overview
Problem
The resolution of OLED display devices is limited by the size precision of the metal mask pattern used in their production, restricting their manufacturing capabilities.
Innovation Solution
An array substrate with multiple light emitting units, each comprising specific electrode and organic material layers, where the layers are configured to allow only one light emitting layer to emit light in each unit, enabling higher resolution without the need for Fine Metal Mask replacement, through controlled carrier transmission characteristics and energy level relationships, and the use of a common barrier layer to prevent electron or hole injection between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Fine Metal Mask (FMM) is used to manufacture light emitting layer of RGB sub-pixel by evaporation deposition, then the manufacturing process is established, but the resolution is limited to the size precision of metal mask pattern
Solution Approach 1:
The pixel structure is segmented into multiple light emitting units (first, second, third, fourth light emitting units), where each unit contains multiple light emitting layers. This segmentation allows different light emitting layers to be formed with relaxed precision requirements while achieving high overall resolution through the segmented arrangement and selective light emission control.
Solution Approach 2:
The patent transitions from a single-layer light emitting structure to a multi-layer vertical structure. By stacking multiple light emitting layers (first, second, and third light emitting layers) in the vertical dimension and controlling their selective emission, the system achieves high resolution without requiring high-precision metal masks for each pixel.
2Manufacturing precision
If multiple light emitting layers are provided in each light emitting unit, then the structure complexity increases, but the resolution and color emission capability improve
Solution Approach 1:
Different light emitting layers are assigned to different light emitting units based on local quality requirements. The first light emitting layer is provided in the second and third light emitting units, the second light emitting layer is provided in the first and second light emitting units, and the third light emitting layer is provided in the third and fourth light emitting units. This local quality differentiation enables selective light emission from specific layers in specific units, achieving high resolution and color capability.
Solution Approach 2:
Each light emitting unit is designed to potentially emit multiple colors through different light emitting layers, but only one layer emits light at a time in each unit. This multi-functionality is achieved by controlling carrier transmission characteristics and energy level relationships, allowing the same structural unit to produce different colors while maintaining high resolution.
3Adaptability or versatility
If carrier transmission characteristics and energy level relationships are controlled to enable selective light emission, then the color emission capability improves, but the control complexity increases
Solution Approach 1:
The patent controls carrier transmission characteristics by adjusting energy level parameters of different light emitting layers. By setting specific energy level relationships between the first, second, and third light emitting layers, the system enables selective light emission from different layers in different light emitting units. This parameter-based control achieves multi-color emission capability while avoiding complex control mechanisms.
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 allows for the production of OLED display devices with higher resolution and the ability to emit light with multiple colors, enhancing the display's precision and color capabilities without the limitations of traditional metal mask precision.
Implementation Method 1
each of the first light emitting unit, the second light emitting unit, the third light emitting unit and the fourth light emitting unit comprises a first electrode, a second electrode and an organic material function layer, the organic material function layer comprising a light emitting portion
Data Source
AI summary
Embodiments of the present disclosure provide an array substrate, a method for producing the same and a display apparatus. The array substrate includes a base substrate; and first to fourth light emitting units provided on the base substrate and arranged periodically thereon. Each light emitting unit of the first to fourth light emitting units includes a first electrode, a second electrode and an organic material function layer, and the organic material function layer comprises a light emitting portion. The light emitting portion includes a first light emitting layer within the second and third light emitting units, a second light emitting layer within the first and second light emitting units, and a third light emitting layer within the third and fourth light emitting units. The first light emitting layer is configured to emit light within at least one of the second and third light emitting units.