OLED Power Controller Mitigates Parasitic Inductance Noise
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Solution Overview
Problem
As display areas for emerging technologies like electroluminescents grow larger, the length of power cables increases, leading to noise due to parasitic inductance, which negatively affects the operation of internal circuitry in display devices.
Innovation Solution
A power controller is used to manage power source voltages and a capacitor to mitigate noise by controlling connections between high-level voltages, ground, and a capacitor across nodes connected to power source voltages, ensuring stable operation of pixels in display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the display area is increased to provide larger screens, then the screen size is improved, but noise increases due to parasitic inductance of the power cable
Solution Approach 1:
A capacitor is introduced as an intermediary component between the power cable and the display circuitry. The capacitor acts as a local energy storage device that provides power during transient changes, thereby reducing the impact of parasitic inductance and suppressing noise in the power supply line.
Solution Approach 2:
The capacitor is pre-charged during periods when the display is not actively changing states (such as during static display periods). This preliminary charging ensures that when power demands change suddenly, the capacitor can immediately supply or absorb current, preventing noise generation from inductive effects.
2Area of moving object
If the power cable length is increased to supply power to larger display areas, then the display area is improved, but noise due to parasitic inductance increases
Solution Approach 1:
The capacitor serves as a mediator between the power source and the display circuitry, buffering power fluctuations and reducing noise transmission. This intermediary component isolates the sensitive display circuit from the noisy power cable, improving operational reliability.
Solution Approach 2:
The capacitor provides beforehand cushioning by being pre-charged to store energy in advance. When power demands fluctuate, the capacitor absorbs or releases energy to cushion against sudden changes, preventing noise and voltage spikes that could affect circuit operation stability.
3Area of moving object
If the display area is increased, then the screen size is improved, but the length of the power cable increases leading to increased parasitic inductance
Solution Approach 1:
The capacitor is placed at the display end of the power cable, acting as a local power reservoir. This intermediary component compensates for the increased parasitic inductance of the longer power cable by providing local energy storage and release capabilities, thereby maintaining stable power delivery despite the extended cable length.
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 effectively eliminates noise caused by parasitic inductance, enhancing the stability of internal circuitry in display devices and improving their performance.
Implementation Method 1
a power controller for supplying a first power source voltage and a second power source voltage for providing a driving current of the plurality of pixels, wherein the power controller connects at least one of a first high level voltage, a ground, and a capacitor to a first node connected to the first power source voltage
Data Source
AI summary
A display device having a particular power controller circuit is disclosed. In one aspect, the display includes a plurality of pixels, and a power controller for supplying a first power source voltage and a second power source voltage for providing a driving current of the plurality of pixels wherein the power controller connects at least one of a first high level voltage, a ground, and a capacitor to a first node connected to the first power source voltage, and connects one of a second high level voltage and the ground to a second node connected to the second power source voltage.