Current-Limiting Circuit for Display Panel Burnout Prevention
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Solution Overview
Problem
The overcurrent protection circuits in boost chips and power management ICs often fail to turn off current outputs in time, leading to panel burnout and significant security risks in liquid crystal display panels.
Innovation Solution
A current-limiting circuit is introduced, comprising a current detection circuit that converts current signals from the power management IC into voltage signals and a current-limiting setting circuit that adjusts the internal current-limiting setting value of the boost chip, enabling timely shutdown of excessive current outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overcurrent protection circuits are used in boost chip and power management IC, then current output can be limited, but the protection cannot turn off current outputs in time leading to panel burnout
Solution Approach 1:
The patent sets a predetermined safe current limit value before operation. When the detected current signal exceeds this predetermined value, the system immediately stops current output. This preliminary setting of safety thresholds enables rapid response without complex real-time calculation, solving the timing delay problem in conventional protection circuits.
Solution Approach 2:
The patent implements a feedback mechanism where the current detection circuit continuously monitors the current signal from power management IC, converts it to voltage signal, and feeds it back to compare with the predetermined safe current limit. This closed-loop feedback enables real-time detection and immediate response to overcurrent conditions, eliminating the response delay in conventional open-loop protection circuits.
2Area of stationary object
If frame size is reduced using GDL architecture, then display border can be minimized, but security risks increase due to potential panel burnout
Solution Approach 1:
The patent applies preliminary anti-action by establishing a safety mechanism that prevents harmful overcurrent before it can cause panel burnout. The current detection and comparison circuit is pre-configured with a safe current limit, and automatically stops current output when the limit is exceeded, counteracting the potential harmful effect before it manifests.
Solution Approach 2:
The patent introduces a current detection circuit and control circuit as intermediary components between the power management IC and the display panel. These intermediary circuits monitor current levels and intervene to stop current flow when unsafe conditions are detected, acting as a protective buffer that eliminates burnout risk while allowing the GDL architecture to maintain reduced frame size.
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 solution effectively prevents panel burnout by ensuring the boost chip and power management IC turn off current outputs when they exceed safe limits, thereby mitigating security risks and ensuring reliable operation.
Implementation Method 1
a current detection circuit configured to receive a first current signal output from the power management IC and convert the first current signal into a corresponding first voltage signal
Data Source
AI summary
Embodiments of the present disclosure provide a current-limiting circuit, a current-limiting device and a display device. A current detection circuit outputs a first voltage signal according to a first current signal output from a power management IC, and a current-limiting setting circuit outputs a second current signal for current-limiting control of a current output signal of a boost chip according to the first voltage signal.