OLED Light Emitting Device with Regulating Resistors
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Solution Overview
Problem
Existing OLED light emitting devices face challenges in achieving uniform light emission due to unequal areas of luminescent layers, leading to non-uniform electric-current densities and potential short circuits, especially in abnormally shaped devices like car lamps, which require complex backplane electric circuits to regulate current densities.
Innovation Solution
Incorporating a plurality of regulating resistors with specific resistance values connected to organic light emitting diodes, ensuring equal electric-current densities by matching resistance values to luminescent layer areas, eliminating the need for a complex backplane electric circuit and allowing for uniform light emission in abnormally shaped devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a complex backplane electric circuit is used to regulate current densities in OLED devices with unequal luminescent layer areas, then current density uniformity is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the current regulation function from the complex backplane circuit and implements it through simple series-connected regulating resistors. Each OLED is regulated by its own resistor placed in series, eliminating the need for complex backplane circuitry while achieving uniform current density distribution.
Solution Approach 2:
The patent replaces expensive and complex backplane circuits with inexpensive regulating resistors. These resistors are simple passive components that can be easily fabricated using standard OLED manufacturing processes, significantly reducing device complexity and cost while maintaining current density uniformity.
2Manufacturing precision
If regulating resistors with specific resistance values are connected to OLEDs to achieve equal current densities, then light emission uniformity is improved, but fabrication process complexity increases
Solution Approach 1:
The patent merges the regulation function into the existing OLED structure by placing resistors in series with each OLED during the same fabrication process. This integration approach allows uniform current density control without adding separate complex regulation systems, maintaining fabrication simplicity.
Solution Approach 2:
The patent achieves light emission uniformity by adjusting the resistance values of the regulating resistors to match the areas of the luminescent layers. By changing the resistance parameter according to the luminescent layer area, the patent compensates for area differences and achieves equal current densities, improving light emission uniformity.
3Device complexity
If series-connected regulating resistors are used instead of backplane circuits, then device structure is simplified, but resistance value precision requirements increase
Solution Approach 1:
The patent addresses the resistance precision requirement by establishing a direct proportional relationship between resistance values and luminescent layer areas. By setting the resistance value according to the area parameter, the patent simplifies the design while maintaining current density uniformity, as the resistance ratio directly compensates for the area ratio.
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
The solution ensures uniform light emission across OLED devices with varying luminescent layer areas without the need for a complex backplane circuit, improving light-emission uniformity and reducing production costs by simplifying the structure and fabrication process.
Implementation Method 1
resistance values of the regulating resistors are configured so that electric-current densities of the plurality of organic light emitting diodes under an equal voltage are equal
Data Source
AI summary
An OLED light emitting device, a method for fabricating an OLED light emitting device and a lamp device. The OLED light emitting device includes: a substrate; a plurality of organic light emitting diodes, wherein the plurality of organic light emitting diodes are located on a same one side of the substrate; and a plurality of regulating resistors, wherein the regulating resistors are connected to the organic light emitting diodes; wherein areas of luminescent layers of the plurality of organic light emitting diodes are not completely equal.