Organic Electroluminescent Device Driving Circuit with Sequential Pre-Charge
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Solution Overview
Problem
Organic electroluminescent devices face issues with unreliable driving voltage application due to high pre-charge currents causing voltage drops, leading to power circuit cutoffs and inefficient energy use.
Innovation Solution
A driving circuit with a pre-charge driving circuit, data driving circuit, and discharge driving circuit that applies pre-charge current and data current sequentially to sub-pixels, and discharges these currents in a controlled manner to prevent voltage drops and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pre-charge current is applied to all sub-pixels simultaneously, then brightness is improved, but voltage drop increases causing driving voltage to become unreliable
Solution Approach 1:
The patent divides the pre-charge current application into sequential segments across different sub-pixel groups rather than applying simultaneously to all sub-pixels. The driving circuit applies pre-charge current to first, second, and third sub-pixel groups in sequence, which reduces the peak current demand on the power supply while still achieving adequate brightness in each group before display.
Solution Approach 2:
The patent applies pre-charge current to sub-pixel groups before the display period to ensure adequate brightness during the actual display. The pre-charge phase prepares the electroluminescent materials in advance, and this preliminary action is performed sequentially across different groups to balance brightness requirements with power supply limitations.
2Illumination intensity
If pre-charge current is applied to all sub-pixels simultaneously, then brightness is improved, but power consumption increases
Solution Approach 1:
The patent segments the pre-charge current application across multiple time slots for different sub-pixel groups. Instead of drawing high power simultaneously for all sub-pixels, the system distributes the power demand over time, reducing peak power consumption while maintaining adequate brightness through sequential charging of electroluminescent materials.
Solution Approach 2:
The patent implements periodic action by cycling through different sub-pixel groups in sequence during the pre-charge phase. Each group receives pre-charge current in its designated time slot, creating a periodic pattern of current application that reduces overall power consumption compared to simultaneous charging of all sub-pixels.
3Use of energy by stationary object
If data current is applied immediately without pre-charge, then power consumption is reduced, but responsive time increases and brightness decreases
Solution Approach 1:
The patent applies pre-charge current to electroluminescent materials before the display period to prepare them for rapid light emission. This preliminary action charges the materials in advance during a dedicated pre-charge phase, enabling faster response during the actual display when data current is applied, thereby reducing responsive time without excessive power consumption.
Solution Approach 2:
The patent segments the current application into distinct phases: pre-charge phase for different sub-pixel groups followed by data current application. This segmentation allows the system to invest power selectively in preparing specific groups before displaying, optimizing the balance between responsive time and power consumption by avoiding continuous high-power operation.
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 reliable voltage application to organic electroluminescent devices by managing pre-charge and data currents, reducing the risk of quick failures and lowering power consumption through sequential application and discharge of currents.
Implementation Method 1
Organic electroluminescent device can display the picture with tens of thousands of high brightness [cd/m2] at about 10V of voltage
Data Source
AI summary
The present invention relates to an electroluminescent device, particularly to an organic electroluminescent device reliably receiving driving voltage from a voltage source, and a method of driving the same. A driving circuit of the electroluminescent device includes first to third sub-pixels formed on crossing areas of data lines and scan lines, a pre-charge driving circuit which applies pre-charge current to the data lines of the first to third sub-pixels and a data driving circuit which applies data current to the pre-charged data lines. The pre-charge current is applied to the first to third sub-pixels in different time. The organic electroluminescent device of the present invention and the method of driving the same can reliably receive the driving voltage from the voltage source, and prevent quick flames of the device.