Active Matrix Display Driver Energy Recycling for Lower Power

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Solution Overview

Problem

Portable electronic devices face high power consumption due to increased capacitive load and dynamic power consumption in displays with higher resolution and refresh rates, leading to reduced battery life.

Innovation Solution

Implementing energy recycling techniques between row and data lines in active matrix displays, including row-to-row, data-to-data, and combined row-data line recycling, to reduce dynamic power consumption by reusing energy stored in capacitors before discharge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If display resolution and refresh rate are increased, then display quality and performance are improved, but dynamic power consumption increases significantly

Engineering Contradiction:

Improvedisplay performanceVSAvoiddynamic power consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent recovers energy from row lines and data lines after their capacitive load is discharged, capturing the energy that would otherwise be wasted. This recovered energy is then reused to pre-charge subsequent lines, directly reducing the dynamic power consumption associated with driving high-resolution displays at high refresh rates

Inventive Principle:

Principle #34Discarding and recovering

2Productivity

If display resolution is increased, then display quality is improved, but capacitive load of row and data lines increases

Engineering Contradiction:

Improvedisplay resolutionVSAvoidcapacitive load

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent implements pre-charging of row and data lines using recovered energy before the actual data writing operation. This preliminary action reduces the peak current required during data writing, effectively managing the capacitive load challenge posed by high-resolution displays

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If battery size is limited, then device portability is improved, but available energy storage is reduced

Engineering Contradiction:

Improvedevice portabilityVSAvoidavailable energy

Core Design Contradiction:

Ease of operationVSLoss of energy

Solution Approach 1:

The patent implements a feedback mechanism where energy consumption patterns of the display are monitored and recovered energy is fed back into the power supply network. This creates a self-sustaining system that reduces net energy draw from the battery, effectively extending operational time without increasing battery size

Inventive Principle:

Principle #23Feedback

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

Reduces dynamic power consumption by up to 36% in row drivers and 16% in data drivers, leading to an average overall power savings of 15-20% in displays, thereby extending battery life.

Implementation Method 1

the capacitor is charged to a first voltage level during a first time period and the capacitor is discharged to a second voltage level during a second time period

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS20260087997A1Low-power active matrix display with row and/or data driver energy recycling techniques

Publication Date: 2026.03.26 GOHARDEHI SHEIDA

AI summary

The disclosure is directed at energy and/or power recycling techniques for use with portable displays in order to extend battery life for portable displays.