Display Power Line Short-Circuit Detection and Inrush Prevention
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Solution Overview
Problem
Display devices face challenges in detecting overcurrents that can lead to short-circuit states and screen burn-in phenomena, making it difficult to prevent inrush currents using only current sensors.
Innovation Solution
A display device and driving method incorporating a first power source with a main power source, auxiliary power source, rectifier, and comparator, connected through specific lines to detect voltage levels and apply signals to prevent overcurrents by controlling power delivery based on short-circuit detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only a current sensor is used to detect overcurrent, then the device complexity is low, but the measurement precision is insufficient to detect minute short-circuit states
Solution Approach 1:
The patent replaces direct current measurement with voltage-based detection. The comparator monitors voltage drops across the power line to indirectly detect current anomalies, substituting a simple voltage sensing mechanism for complex current sensing hardware while achieving superior detection precision for minute short-circuit states
Solution Approach 2:
The patent introduces a voltage signal as an intermediary to detect current conditions. Instead of directly measuring current, the system measures voltage across the power line, which serves as a mediator that reflects current flow status and enables precise detection of short-circuit conditions without requiring complex current sensors
2Productivity
If the main power source applies high voltage immediately, then the productivity is high, but harmful factors increase due to inrush current
Solution Approach 1:
The patent applies preliminary action by first activating the auxiliary power source to charge the power line to a preliminary voltage level before activating the main power source. This preparatory step ensures that when the main power source engages, the voltage differential is minimized, preventing inrush current while maintaining efficient power delivery
Solution Approach 2:
The auxiliary power source acts as a cushioning mechanism that absorbs the shock of initial power application. By pre-charging the power line and providing initial power, it cushions the system against the harmful inrush current that would otherwise occur when the main power source is immediately activated at full voltage
3Object-generated harmful factors
If the auxiliary power source charges the power line first, then the harmful factors are reduced, but the duration of action increases due to two-stage power application
Solution Approach 1:
The patent implements periodic action through sequential activation of power sources. The auxiliary power source operates first for a brief charging period, then the main power source takes over. This time-division approach minimizes the total duration by using each power source only when needed, rather than running both simultaneously or using a single prolonged activation
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
Effectively detects short-circuit states and prevents inrush currents, ensuring stable power delivery to pixels and minimizing the risk of screen burn-in, while optimizing power usage by maintaining voltage levels.
Implementation Method 1
The rectifier is connected between the auxiliary power source and the first power line
Implementation Method 2
The comparator compares a voltage of the first power line and provides its output to the detection line
Data Source
AI summary
A display device includes a first power source, a timing controller, and pixels. The timing controller is connected to the first power source through a main line, an auxiliary line, and a detection line. The pixels are commonly connected to the first power source through a first power line. The first power source includes: a main power source connected to the first power line and the main line; an auxiliary power source connected to the auxiliary line; a rectifier connected between the auxiliary power source and the first power line; and a comparator comparing a voltage of the first power line and providing its output to the detection line.