Display Power-Supply Adjusting Circuit for Reverse Current Protection

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Solution Overview

Problem

The continuous charging-and-discharging process in liquid crystal displays causes large reverse currents that damage the power-supply module, necessitating improved protection against such currents.

Innovation Solution

A power-supply adjusting circuit is introduced to detect and either absorb or discharge reverse currents to a ground terminal, while also outputting compensation currents to stabilize the power-supply circuit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the power-supply module continuously supplies current to the data driving circuit during charging-and-discharging process, then the data driving circuit can operate normally, but large reverse current damages the power-supply module

Engineering Contradiction:

Improveprotection capability of power-supply moduleVSAvoidreverse current damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a protection circuit as an intermediary component between the power-supply module and the data driving circuit. This protection circuit includes detection units that monitor current direction and magnitude, and control units that activate protective measures when reverse current is detected, thereby protecting the power-supply module from damage while allowing normal operation to continue

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements a feedback mechanism where the protection circuit continuously monitors the current flowing through the power-supply module and provides feedback signals to control the power supply. When reverse current is detected through detection units, the feedback loop triggers protective actions such as shutting down or limiting the current, preventing damage to the power-supply module

Inventive Principle:

Principle #23Feedback

2Productivity

If the power-supply module receives large reverse current, then the data driving circuit can discharge current, but the power-supply module is damaged

Engineering Contradiction:

Improvecharging-and-discharging capabilityVSAvoidprotection capability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent makes the power-supply module dynamic by introducing controllable switching elements and detection units that can change the circuit configuration in real-time. The protection circuit dynamically adjusts its state based on current direction and magnitude, enabling the system to handle both charging and discharging operations while protecting against harmful reverse current through adaptive control

Inventive Principle:

Principle #15Dynamics

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 damage to the power-supply module by managing reverse currents and stabilizes the power output, enhancing the display panel's performance and reducing energy consumption.

Implementation Method 1

an energy storage circuit connected to the first adjusting circuit and the second adjusting circuit and configured to output a compensation current to the power transmission line when the third switching transistor and the fourth switching transistor are turned on

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

The power-supply adjusting circuit is configured to receive reverse current and absorb-and-store the reverse current or the power-supply adjusting circuit is configured to receive the reverse current and discharge the reverse current to a ground terminal, when the power-supply adjusting circuit detects that the reverse current is input via the driving power output terminal

Methodology Applied

Scientific EffectElectrical current detection: Conduction (electrical)

Data Source

PatentUS12482403B2Power-supply adjusting circuit and display terminal

Publication Date: 2025.11.25 HKC CORP LTD

AI summary

Disclosed are a power-supply adjusting circuit and a display terminal. The power-supply adjusting circuit is applied to a display panel for image display. The power-supply adjusting circuit is connected to a driving power output terminal of a power-supply circuit, the power-supply circuit is configured to output driving power to multiple data driving circuits of the display panel via the driving power output terminal. The power-supply adjusting circuit is configured to receive reverse current and absorb-and-store the reverse current or the power-supply adjusting circuit is configured to receive the reverse current and discharge the reverse current to a ground terminal, when the power-supply adjusting circuit detects that the reverse current is input via the driving power output terminal.