Display Driver IC Charge Pump Flying Capacitor Power Outage
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Solution Overview
Problem
Display driver ICs with capacitor-less voltage regulators are prone to functional errors and image sticking when power is abnormally cut off, as they lack external capacitors to store charge, leading to disrupted operating voltages for gate and source driver circuits.
Innovation Solution
Incorporating a charge pump with a flying capacitor and switches between nodes to maintain voltages for the gate and source driver circuits during power outages, ensuring continuous operation and preventing image sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a capacitor-less voltage regulator is used to reduce volume and cost, then the number of external capacitors is reduced, but functional errors and image sticking occur when power is abnormally cut off
Solution Approach 1:
The patent embeds a flying capacitor within the display driver IC package, nesting the capacitor functionality inside the existing integrated circuit structure. This eliminates the need for separate external capacitors while maintaining the voltage storage function needed to prevent operational errors during power interruptions.
Solution Approach 2:
The flying capacitor is pre-charged to a first voltage level before power failure occurs. When power is abnormally cut off, this pre-stored charge is transferred to maintain the operating voltage of the gamma voltage regulator, preventing functional errors and image sticking without requiring external capacitors.
2Productivity
If external capacitors are removed to increase assembly yield and reduce cost, then manufacturing efficiency improves, but voltage storage capability during power outages is lost
Solution Approach 1:
The patent merges the voltage storage function previously performed by external capacitors into the display driver IC itself through the flying capacitor. This integration eliminates separate components, simplifying assembly and improving yield while maintaining the essential voltage storage capability during power interruptions.
Solution Approach 2:
The display driver IC becomes self-sufficient by incorporating the flying capacitor internally, eliminating its dependence on external capacitors. The integrated circuit now provides its own voltage storage service, maintaining operational reliability during power outages without requiring additional external components.
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 suppresses functional errors and image sticking in display panels by maintaining voltages for the driver circuits during power interruptions, enhancing the reliability of display systems.
Implementation Method 1
a flying capacitor connected between the first node and the second node
Data Source
AI summary
A display driver integrated circuit (IC) and a display system including the same are provided. The display driver IC includes: a charge pump including a first node and a second node; a flying capacitor connected between the first node and the second node; a voltage regulator; a first switch connected between an output terminal of the voltage regulator and one of the first node and the second node; and a second switch connected between a ground and the other of the first node and the second node.