Planar Light Emitting Device Driver With Integrated Passive Filtering
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Solution Overview
Problem
Existing light emitting devices with integrated drivers face challenges in achieving a reduced thickness, as they require significant space for passive filters, which is particularly problematic for ultra-thin applications like thin displays, and often necessitate additional components and complexity.
Innovation Solution
The integration of a planar light emitting element with internal capacitance serves as a passive output filter, reducing or eliminating the need for external passive filters, allowing for a thinner, more flexible driver design with a multilayer structure and soft-magnetic core, enabling a high power density and cost-effective, reliable device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If passive filters (capacitors and inductors) are integrated into the driver, then voltage conversion efficiency is improved, but device thickness increases
Solution Approach 1:
The patent merges the driver circuit and passive filters into a single integrated structure. The driver and filters are fabricated together on the same substrate using the same manufacturing process, eliminating the need for separate components and reducing overall device thickness while maintaining voltage conversion efficiency.
Solution Approach 2:
The integrated driver structure serves multiple functions simultaneously: it provides voltage conversion, signal filtering, and current regulation all within a single thin-film device. This multi-functionality eliminates the need for separate passive filter components, thereby reducing device thickness.
2Device complexity
If passive filters are completely integrated into the driver, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces traditional mechanical assembly of separate driver and filter components with a thin-film fabrication process. All components are deposited and patterned in-situ on the substrate, eliminating the need for precise mechanical alignment and assembly while reducing overall device complexity.
Solution Approach 2:
The integration approach changes the manufacturing parameters from discrete component assembly to continuous thin-film deposition and patterning. This parameter change enables simultaneous fabrication of multiple components with controlled impedance and capacitance values, managing manufacturing precision requirements through process control rather than assembly precision.
3Length of stationary object
If the driver is made flat with integrated passive filters, then device thickness is reduced, but component volume increases
Solution Approach 1:
The patent transitions from three-dimensional stacked components to a two-dimensional planar integration approach. All driver and filter components are laid out on the same substrate plane, spreading the volume horizontally rather than vertically, thereby reducing thickness while distributing the component volume across the substrate area.
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 approach results in a highly efficient, flexible, and cost-effective light emitting device with optimized form factor, suitable for various applications, including thin displays and wearable technology, by leveraging the internal capacitance of the OLED for filtering and power supply adaptation.
Implementation Method 1
the light emitting element having an internal capacitance is connected to said driver in such a way that the internal capacitance serves as a passive output filter of the driver
Implementation Method 2
the inductor comprises a substrate with a first and a second side, a winding and a soft-magnetic core, wherein the winding is embedded in the substrate, wherein the core comprises a first soft-magnetic sheet which is arranged on the first side of the substrate and a second soft-magnetic sheet which is arranged on the second side of the substrate
Data Source
AI summary
A light emitting device includes an electronic driver and a planar light emitting element. The driver is connected with a source and the light emitting element, where the light emitting element has an internal capacitance and is connected to the driver in such a way that the internal capacitance serves as a passive output filter of the driver.