Diode Isolation for LCD Backlight Capacitance Management

Solution Overview

Problem

Existing power architectures in display assemblies, such as liquid crystal display backlight circuits, face challenges in isolating capacitance to prevent discharges that could ignite explosive atmospheres, while reducing capacitance leads to unstable operation.

Innovation Solution

Incorporating a diode in the power subsystem, coupled at its anode to an electrical node and cathode to the inputs of voltage regulators, to isolate capacitances associated with the inputs of the voltage regulators from the electrical node, thereby reducing the risk of discharge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If capacitances on voltage rails are reduced to prevent discharge in explosive atmospheres, then safety is improved, but operation stability deteriorates

Engineering Contradiction:

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The patent segments the power distribution system by introducing separate capacitance elements (C1, C2, C3) on different voltage rails (VBAT, VREGOUT, VDD). This segmentation allows each rail to have its own localized capacitance, preventing discharge propagation between rails while maintaining stable operation on each individual rail.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If capacitances are isolated from electrical nodes using diodes, then discharge prevention is improved, but circuit complexity increases

Engineering Contradiction:

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent introduces diodes (D1, D2, D3) as intermediary elements between the voltage rails and capacitance elements. These diodes act as one-way valves that allow capacitance to be isolated from high-voltage nodes during normal operation while still permitting discharge control when needed, thereby preventing explosive discharges without requiring complex isolation circuits.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 isolates capacitances, reducing the risk of explosive discharges while maintaining stable operation of the display assembly components.

Implementation Method 1

a diode coupled at its anode to the electrical node and coupled at its cathode to respective inputs of each of the first set of one or more voltage regulators in order to isolate capacitances associated with the inputs of the first set of one or more voltage regulators from the electrical node

Methodology Applied

Scientific EffectDiode: Diode

Data Source

PatentUS10788871B1Systems and methods for isolating capacitance from liquid crystal display backlight circuit

Publication Date: 2020.09.29

AI summary

An information handling system may include a plurality of information handling resources and a power subsystem for providing electrical energy to the plurality of information handling resources, the power subsystem comprising a source of electrical energy for supplying a supply voltage to an electrical node, a first set of one or more voltage regulators, and a diode coupled at its anode to the electrical node and coupled at its cathode to respective inputs of each of the first set of one or more voltage regulators in order to isolate capacitances associated with the inputs of the first set of one or more voltage regulators from the electrical node.