OLED Light Emitting Blocks Patterned by Density for Gray-Scale Control
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Solution Overview
Problem
Current organic light emitting diodes (OLEDs) face challenges in generating full-color, gray-scale, three-dimensional, and dynamic images due to the complexity and cost of thin film transistor (TFT) driving control circuits, which complicate the process of controlling luminous intensity at each pixel.
Innovation Solution
A light emitting element comprising a first and second electrode layer with an organic light emitting layer patterned into blocks of different densities, allowing for gray-scale image generation by voltage control, and through color separation processes, enabling full-color and three-dimensional imaging by arranging monochromatic blocks with varying densities and voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thin film transistor (TFT) control circuits are used to control luminous intensity of each pixel, then full-color and gray-scale images can be generated, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The organic light emitting layer is divided into multiple sub-layers (first organic light emitting layer, second organic light emitting layer, third organic light emitting layer), each containing light emitting blocks of different densities. This segmentation allows different layers to emit different colors (red, green, blue) independently, enabling full-color image generation without complex TFT control circuits. The segmentation of the emitting layer into functional units with different properties simplifies the overall control mechanism.
Solution Approach 2:
Different regions of the organic light emitting layer are designed with different light emitting block densities to achieve different luminous intensities. By controlling the density distribution of light emitting blocks in each sub-layer rather than using uniform structures, the patent achieves gray-scale and color control through spatial variation in material density, eliminating the need for complex electronic control circuits.
2Device complexity
If light emitting blocks with different densities are used to generate gray-scale images, then TFT control circuits are eliminated, but the organic light emitting layer structure becomes more complex
Solution Approach 1:
The patent employs a nested structure where multiple organic light emitting layers are stacked sequentially between the first and second electrode layers. Each layer contains light emitting blocks and is nested within the overall device structure, with charge generating layers positioned between the organic layers. This nested arrangement allows systematic fabrication through sequential deposition processes, making the complex structure manageable and manufacturable.
Solution Approach 2:
Instead of controlling image properties through temporal modulation via TFT circuits, the patent transitions to spatial control by varying the density of light emitting blocks within the organic light emitting layers. This dimensional approach uses the physical structure and material distribution in space to encode image information, simplifying the control mechanism while adding structural complexity that can be addressed through fabrication processes.
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 solution simplifies the generation of gray-scale, full-color, and dynamic images without the need for TFT control, reducing costs and enhancing image complexity, while allowing for three-dimensional effects through strategic voltage application and block arrangement.
Implementation Method 1
an organic light emitting layer sandwiched between the first electrode layer and the second electrode layer, wherein the organic light emitting layer is patterned to include a plurality of light emitting blocks with different densities. When a voltage is applied between the first electrode layer and the second electrode layer, the light emitting element generates a gray-scale image
Data Source
AI summary
A light emitting element is provided, including a first electrode layer, a second electrode layer, and an organic light emitting layer sandwiched between the first electrode layer and the second electrode layer. The organic light emitting layer is patterned to include a plurality of light emitting blocks with different densities. In an embodiment, the light emitting blocks are divided into a plurality of light emitting block groups that are arranged in an alternate manner. In another embodiment, a light emitting element includes a first electrode layer, a first organic light emitting layer, a charge generating layer, a second organic light emitting layer, and a second electrode layer sequentially stacked on one another. The first and second organic light emitting layer are patterned to form a plurality of first and second light emitting blocks with different densities, respectively. Thus, the light emitting element generates full-color, gray-scale, three-dimensional, or dynamic images.