Gate Driving Circuit Inversion for Display Panel Waveform Quality

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Solution Overview

Problem

The existing gate driving circuits for display panels require excessive wire layout space and consume high power due to backward-extended wires, which also deteriorate the output waveform and increase parasitic resistance and capacitance, leading to inefficiencies in driving multiple pixels.

Innovation Solution

A gate driving circuit with a first and second gate driving unit string, where the output pulse from the second gate driving unit is used to determine whether to disable the output pulse of the first gate driving unit, eliminating the need for backward-extended wires and reducing parasitic resistance and capacitance, thereby improving waveform quality and power efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If backward-extended wires are used to deliver charging gate driving pulses from succeeding-stage to preceding-stage charging gate driving units, then the gate driving circuit can control pixel charging, but the wire layout space increases excessively and power consumption increases

Engineering Contradiction:

Improvepixel charging controlVSAvoidwire layout space

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

Instead of extending wires backward from succeeding-stage to preceding-stage units, the patent inverts the approach by having each charging gate driving unit generate its own charging gate driving pulse independently using a pulse generating circuit, eliminating the need for backward-extended wires entirely

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

Each charging gate driving unit is equipped with its own pulse generating circuit that autonomously generates the required charging gate driving pulse based on the sharing gate driving pulse, making the system self-sufficient without requiring complex inter-stage wire connections

Inventive Principle:

Principle #25Self-service

2Reliability

If backward-extended wires are used to deliver charging gate driving pulses, then the gate driving circuit can control pixel charging, but power consumption increases

Engineering Contradiction:

Improvepixel charging controlVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by stationary object

Solution Approach 1:

The patent eliminates the energy-consuming backward wire extensions by inverting the control architecture - each unit generates its own pulse locally rather than receiving it from the next stage, dramatically reducing power consumption

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

Each charging gate driving unit independently generates its own charging gate driving pulse through its integrated pulse generating circuit, eliminating the need for power-intensive signal transmission over long wire paths

Inventive Principle:

Principle #25Self-service

3Reliability

If backward-extended wires are used to deliver charging gate driving pulses, then the gate driving circuit can control pixel charging, but parasitic resistance and capacitance increase which deteriorates output waveform

Engineering Contradiction:

Improvepixel charging controlVSAvoidoutput waveform quality

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent inverts the signal generation approach, eliminating backward-extended wires that introduce parasitic effects, thereby preserving output waveform quality while maintaining charging control functionality

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

Each charging gate driving unit generates its own pulse locally, avoiding the parasitic resistance and capacitance associated with long wire extensions, thus maintaining high output waveform quality

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS8711132B2Display panel and gate driving circuit and driving method for gate driving circuit

Publication Date: 2014.04.29 AU OPTRONICS CORP

AI summary

An exemplary gate driving circuit is adapted for driving a display panel including multiple pixels and includes a first gate driving unit string and a second gate driving unit string. The first gate driving unit string includes multiple cascade-connected first gate driving units and receives a start pulse. The first gate driving units are for generating output pulses to drive the pixels. The second gate driving unit string includes multiple cascade-connected second gate driving units and receives the start pulse. The second gate driving units are for generating output pulses to drive the pixels. The output pulse generated from one of the second gate driving units is provided to one of first gate driving units to determine whether to disable the output pulse of the first gate driving unit which receives the output pulse generated from the second gate driving units.