Display Driving Circuit Latch-Up Prevention Unit

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Solution Overview

Problem

Conventional display driving circuits face latch-up issues due to excessive current flow and premature output of the second driving voltage, leading to increased costs and size requirements from the separate manufacturing and attachment of Schottky diodes for latch-up prevention.

Innovation Solution

A display driving circuit with a latch-up prevention unit that includes switching means connected to ground, receiving the second driving voltage and grounding it for a preset period, thereby preventing latch-up and reducing circuit size by integrating the latch-up prevention unit on the same substrate as the voltage generation units.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a Schottky diode is used to prevent latch-up, then latch-up prevention is achieved, but device complexity and manufacturing cost increase due to separate manufacturing and attachment

Engineering Contradiction:

Improvelatch-up preventionVSAvoidcircuit structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The latch-up prevention unit is merged with the voltage generation units and integrated on the same substrate. The switching means (first and second switching units) are formed together with the voltage generation units in a single semiconductor manufacturing process, eliminating the need for separate Schottky diodes and their attachment processes.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The switching means serves dual functions: it acts as a switching element for voltage generation and simultaneously functions as a latch-up prevention mechanism. The first switching unit prevents latch-up in the first voltage generation unit, while the second switching unit prevents latch-up in the second voltage generation unit, providing universal protection across multiple voltage generation circuits.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a Schottky diode is attached separately for latch-up prevention, then latch-up prevention is achieved, but manufacturing process complexity increases

Engineering Contradiction:

Improvelatch-up preventionVSAvoidmanufacturing process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

3Power

If excessive current flows during voltage generation, then voltage generation is achieved, but latch-up occurs due to excessive current

Engineering Contradiction:

Improvevoltage generation capabilityVSAvoidexcessive current

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The switching means is configured to preemptively block excessive current before it can cause latch-up. The first switching unit prevents excessive current from flowing into the first voltage generation unit, and the second switching unit prevents excessive current from flowing into the second voltage generation unit, thereby preventing latch-up before it occurs.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The switching means acts as an intermediary element between the voltage input and the voltage generation units. It controls current flow by switching between conductive and non-conductive states, mediating between the need for voltage generation and the risk of excessive current-induced latch-up.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8232985B2Display driving circuit including a latch-up prevention unit

Publication Date: 2012.07.31 MAGNACHIP SEMICON LTD

AI summary

A display driving circuit is provided. The display driving circuit includes first to third voltage generation units configured to receive an externally applied input voltage having a same magnitude and generate respective voltages having different magnitudes, and a latch-up prevention unit connected to the second voltage generation unit and configured to receive a lower voltage among voltages output from the second voltage generation unit and to ground the lower voltage for a preset period of time.