OLED Lighting Apparatus with Parallel Emission Units
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Solution Overview
Problem
Organic light emitting diode (OLED) lighting apparatuses face challenges in efficiently emitting light of various colors and controlling luminance, particularly due to complex structures and voltage drops when trying to adjust color temperature and luminance for different applications.
Innovation Solution
The OLED lighting apparatus features a substrate with alternating first and second line electrodes, connected by separate connection members, allowing for independent voltage control and emission layer colors to produce white light with adjustable color temperature, while minimizing voltage drops through a simplified structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple lines are used to control luminance and color for each portion of the OLED, then the ability to control luminance and color temperature is improved, but the device structure becomes complex and voltage drop increases
Solution Approach 1:
The OLED is divided into multiple emission units (first emission units with first organic emission layers and second emission units with second organic emission layers) that can be independently controlled. Each emission unit has its own organic emission layer with different emission characteristics, allowing independent control of different color components without requiring complex external control circuits for each pixel.
Solution Approach 2:
Different organic emission layers are used in different regions of the OLED to provide different emission colors (e.g., red, green, blue). This allows each region to have optimized emission characteristics for its specific function, enabling color control through spatial distribution of different materials rather than through complex electrical control of each pixel.
2Adaptability or versatility
If multiple lines are used to supply different power to each cell, then the ability to emit various colors is improved, but voltage drop occurs due to increased resistance
Solution Approach 1:
Multiple emission units are connected in parallel between the same pair of electrodes (anode and cathode). This merging approach allows all emission units to receive the same driving voltage, eliminating voltage drop issues that would occur with series connections or complex multi-line configurations. The parallel connection simplifies the electrical structure while maintaining the ability to control different color emissions through the inherent properties of different organic emission layers.
3Device complexity
If a single line controls overall current for monochromatic OLED, then the structure is simple, but the ability to control various colors and luminance is limited
Solution Approach 1:
Different organic emission layers are placed in different spatial regions of the OLED, each emitting different colors. By controlling the area or intensity of excitation in each region, or by using the natural emission characteristics of different materials, the device can produce various colors and luminance levels while maintaining a simple single-line electrical structure.
Solution Approach 2:
The OLED uses composite organic emission layers with different emission characteristics (e.g., red-emitting, green-emitting, blue-emitting materials) in different regions. This material-based differentiation allows the device to emit various colors without requiring complex electrical control circuits, achieving versatility through material composition rather than structural complexity.
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 enables effective emission of various colors, control of luminance, improved luminous efficiency, and adjustable color temperature, while preventing voltage drops, thus enhancing the OLED lighting apparatus's versatility and performance.
Implementation Method 1
The OLED emits light using energy generated when excitons produced by electron-hole combinations in the organic emission layer drop from an excited state to a ground state.
Data Source
AI summary
An organic light emitting diode lighting apparatus includes: a substrate main body including a sealing area and a sealing line surrounding the sealing area; a plurality of first line electrodes of which both ends are located within the sealing area; a plurality of second line electrodes, at least one end of which is located outside the sealing area; an encapsulating member disposed to face the substrate main body; a sealant disposed on the sealing line to bond the substrate main body and the encapsulating member and seal the sealing area; a first connection member coupled to the ends of the plurality of first line electrodes within the sealing area; and a second connection member coupled to the ends of the plurality of second line electrodes outside the sealing area.