OLED Illuminating Device with Patterned Emissive Zones
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Solution Overview
Problem
Conventional OLED illuminating devices have a high production cost due to their large thickness, low production yield, and suffer from chromatic shift issues caused by the shorter lifespan of blue light emitting materials, which limits the adjustability of illuminated light chrominance.
Innovation Solution
The OLED illuminating device features a patterned organic light emitting layer with blue and yellow light emitting zones arranged on the same plane, electrically insulated from each other, with a larger projected area for blue zones to reduce thickness and current density, and separate control of input currents for each zone to adjust chromaticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple layers are stacked sequentially to generate white light by mixing blue and yellow light, then the chromaticity can be controlled, but the total thickness becomes large resulting in low production yield and high cost
Solution Approach 1:
The organic light emitting layer is segmented into multiple independently controlled emitting zones (blue, yellow, cyan, green, red zones) arranged in a matrix pattern on the same plane. Each zone is electrically insulated from others and can be controlled independently through separate electrode connections, allowing white light generation without stacking multiple thick layers
Solution Approach 2:
The patent transitions from a vertical stacking approach (multiple layers along the thickness direction) to a planar arrangement approach (multiple emitting zones arranged in a matrix on the same plane). This dimensional change from 3D stacking to 2D distribution reduces device thickness while maintaining the capability to generate white light through color mixing
2Duration of action of moving object
If blue light emitting material is used in the blue light emitting layer, then blue light can be generated, but the material has shorter lifespan causing chromatic shift after long use
Solution Approach 1:
Different emitting zones use different light emitting materials optimized for their specific function. The blue emitting zones use blue light emitting material, while yellow, cyan, green, and red zones use materials with longer lifespans suitable for their respective colors. This local optimization allows the overall device to maintain chromatic stability even if blue material degrades faster
Solution Approach 2:
The light emitting layer uses a composite structure with multiple types of light emitting materials distributed in different zones. Each material is selected for its specific properties (color emission characteristics and lifespan), and their combined operation produces white light with improved overall stability compared to relying solely on blue material
3Adaptability or versatility
If blue and yellow light emitting materials are chosen to determine chrominance, then white light can be generated, but the chrominance cannot be adjusted once materials are selected
Solution Approach 1:
The patent implements dynamic control of chrominance by allowing independent adjustment of input currents to different emitting zones through separate electrode connections. The chromaticity can be dynamically changed by varying the current ratios to different color zones (blue, yellow, cyan, green, red), enabling adaptation to different lighting requirements without changing the physical structure or materials
Solution Approach 2:
The light emitting layer serves multiple functions: it can generate different colors (blue, yellow, cyan, green, red) from different zones, mix these colors to produce white light, and dynamically adjust chromaticity by controlling current distribution. This multi-functionality is achieved through the matrix arrangement of independently controllable emitting zones with separate electrode connections
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 design reduces production costs, extends the lifespan of blue light emitting zones, and minimizes chromatic shift, while allowing for adjustable chromaticity of the illuminated light.
Implementation Method 1
an organic light emitting structure 13, and a cathode layer 14 formed on the organic light emitting structure 13. The organic light emitting structure 13 includes a hole injection layer 131, a first hole transfer layer 132, a blue light emitting layer 133 that is made of a blue light emitting material
Data Source
AI summary
An organic light emitting diode (OLED) illuminating device includes a substrate, first and second electrode units and a light emitting structure. The first electrode unit is disposed on the substrate, the light emitting structure is disposed on the first electrode unit, and the second electrode unit is disposed on the light emitting structure. The light emitting structure includes a patterned organic light emitting layer having blue light emitting zones and yellow light emitting zones that are spaced apart from each other, that are arranged on the same plane and that are electrically insulated from each other. An area of the blue light emitting zones is larger than that of the yellow light emitting zones.