Parallel Driving Circuit for Planar Organic Electroluminescent Devices
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Solution Overview
Problem
Conventional organic electroluminescent devices connected in series suffer from reduced light emitting efficiency due to malfunctioning elements, require high driving voltage, and are not cuttable, leading to increased costs and manufacturing time for custom sizes.
Innovation Solution
A driving system and method for a planar organic electroluminescent device that connects light emitting elements in parallel, using a driving module to provide constant current, allowing for pre-manufacturing of large-sized devices that can be cut to desired shapes and sizes while adjusting driving current automatically through sheet resistance design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If organic electroluminescent elements are connected in series, then the device can be driven with simpler circuitry, but the light emitting efficiency deteriorates when one element malfunctions and the device requires high driving voltage
Solution Approach 1:
The patent segments the light emitting elements into parallel groups rather than connecting them in a single series chain. Each parallel group can operate independently, so when one element malfunctions, the others continue to emit light. This segmentation resolves the contradiction by maintaining circuit simplicity while improving reliability through parallel architecture.
2Device complexity
If organic electroluminescent elements are connected in series, then the circuit configuration is simpler, but the driving voltage increases which increases electric shock risk
Solution Approach 1:
By segmenting the circuit into parallel connections rather than a single series chain, the patent reduces the total driving voltage required while maintaining circuit configuration simplicity. Each parallel branch operates at lower voltage, thereby reducing electric shock risk while keeping the overall circuit design straightforward.
3Adaptability or versatility
If the device is manufactured in custom sizes, then it meets specific application requirements, but the cost and manufacturing time increase when ordering from manufacturers
Solution Approach 1:
The patent enables preliminary manufacturing of large-sized light emitting devices that can later be cut into various custom shapes and sizes. This preliminary action of creating a master device allows subsequent customization without requiring new manufacturing processes, thereby maintaining high productivity while achieving adaptability to different application requirements.
4Adaptability or versatility
If the device is cut to desired shapes and sizes, then custom applications are satisfied, but the electrical connection may be damaged reducing light emitting efficiency
Solution Approach 1:
The patent incorporates preliminary design features including protective coatings and reinforced connection structures that are applied before cutting. These preliminary actions protect the electrical connections during the cutting process, ensuring that custom shaping does not compromise connection integrity or light emitting efficiency.
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
Ensures continued light emitting efficiency after cutting, reduces voltage requirements to prevent electric shock, and allows for cost-effective, timely production of custom-sized devices with automatic current adjustment.
Implementation Method 1
planar organic electroluminescent device that connects a plurality of light emitting elements to one another and drives the light emitting elements with a constant current output by a driving module
Data Source
AI summary
A driving system and a driving method for a planar organic electroluminescent device are provided. The light emitting device has multiple light emitting elements, each having a first electrode and a second electrode. The driving system includes a first circuit, a second circuit, a driving module, and a ground circuit. The first circuit is connected to and provides a constant voltage to the first electrode of each light emitting element. The second circuit is connected to the second electrode of each light emitting element. The driving module is respectively connected to the second electrode of each light emitting element through the second circuit. The ground circuit is connected to the driving module and connects each light emitting element to the ground. The first electrodes of the light emitting elements are connected to one another, and the light emitting elements are driven by a constant current output by the driving module.