Light Emitting Device Sub-Electrode Segmentation for Reduced Current Sources
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Solution Overview
Problem
Conventional light emitting devices have a complex structure and increased size due to the need for multiple current sources when only one or several colors of light are required, making them inefficient for applications that do not necessitate various color emission.
Innovation Solution
The light emitting device is simplified by using sub-electrode layers and sub-electrode lines to reduce the number of current sources needed, allowing for efficient operation with fewer current sources, specifically three for red, green, and blue sub-pixels, and optionally four for red, green, blue, and white sub-pixels, thereby decreasing size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple current sources are used to drive each data line for full-color emission, then color versatility is improved, but device complexity and size increase
Solution Approach 1:
The device segments the electrode structure into sub-electrode layers (first sub-electrode layer and second sub-electrode layer) that can be independently controlled. This segmentation allows different regions to emit different colors by applying voltages to specific sub-electrode combinations, enabling full-color display with fewer current sources than traditional approaches where each data line requires its own current source.
Solution Approach 2:
The patent implements multi-functionality by designing sub-pixels that can emit multiple colors (red, green, blue, white) through different voltage combinations applied to the sub-electrode layers. A single pixel structure can produce various colors by controlling which sub-electrodes are activated, making the device capable of full-color emission without requiring separate current sources for each color channel.
2Adaptability or versatility
If multiple current sources are used to drive each data line for full-color emission, then color versatility is improved, but device size increases
Solution Approach 1:
The device segments the electrode structure into sub-electrode layers (first sub-electrode layer and second sub-electrode layer) that can be independently controlled. This segmentation allows different regions to emit different colors by applying voltages to specific sub-electrode combinations, enabling full-color display with fewer current sources than traditional approaches where each data line requires its own current source.
Solution Approach 2:
The patent merges the functionality of multiple current sources into a single current source by using the sub-electrode layer configuration. The first and second sub-electrode layers work together to produce different colors through voltage combinations, effectively combining what would traditionally require separate current sources into one shared resource, thereby reducing device area.
3Ease of manufacture
If conventional electrode structure is used, then manufacturing is simpler, but device functionality is limited
Solution Approach 1:
The device segments the electrode structure into sub-electrode layers (first sub-electrode layer and second sub-electrode layer) that can be independently controlled. This segmentation allows different regions to emit different colors by applying voltages to specific sub-electrode combinations, enabling full-color display with fewer current sources than traditional approaches where each data line requires its own current source.
Solution Approach 2:
The patent adds a dimensional aspect to the electrode structure by introducing sub-electrode layers stacked in different orientations (first sub-electrode layer with first direction, second sub-electrode layer with second direction). This dimensional organization enables color control through spatial arrangement of electrodes rather than requiring separate current sources for each color, maintaining manufacturing simplicity while enhancing functionality.
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 simplifies the device structure, reduces power consumption, and minimizes size, making it suitable for applications requiring specific color emission such as illuminating apparatus, backlight, and neon signs.
Implementation Method 1
A light emitting device generates a light having a certain wavelength when certain voltage and current are applied thereto. Especially, an organic electroluminescent device is self light-emitting device.
Data Source
AI summary
A light emitting device comprises an anode electrode layer disposed in a first direction, a cathode electrode layer disposed in a second direction different from the first direction, an emitting area with a pixel forming on an area crossed by the anode electrode layer and the cathode electrode layer and a sub-electrode layer disposed outside of the emitting area and electrically connected with at least two the anode electrode layers.