MicroLED Driver Voltage Control for Variable-Load Display Power

Solution Overview

Problem

Conventional microLED display systems suffer from low power efficiency due to varying loading with constant power supply, despite adopting pulse-width modulation (PWM) schemes.

Innovation Solution

A display system that dynamically provides different power-supply voltages to drivers based on the content of data to be displayed, using a power management unit (PMU) and timing controller to optimize power efficiency by determining and generating appropriate voltages for each group of drivers during line or frame scan periods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If constant power supply is used for drivers, then power supply simplicity is maintained, but power efficiency deteriorates due to varying loading

Engineering Contradiction:

Improvepower supply structureVSAvoidpower efficiency

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The patent implements dynamic power supply voltage adjustment for driver circuits based on the actual data content being displayed. The power management unit dynamically changes the power supply voltage level according to the brightness requirements of the current frame, transforming the static constant power supply into a dynamic adaptive power supply that matches the varying loading conditions of the microLED display.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the power supply voltage parameter dynamically based on data content. The power management unit determines appropriate power supply voltage levels according to the brightness requirements of the display data, and adjusts the power supply voltage accordingly. This parameter change enables the system to optimize power efficiency by matching the power supply level to the actual display requirements.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If PWM scheme is adopted for brightness control, then brightness precision is improved, but power efficiency deteriorates due to varying loading

Engineering Contradiction:

Improvebrightness control precisionVSAvoidpower efficiency

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The patent changes the power supply voltage parameter dynamically based on data content. The power management unit determines appropriate power supply voltage levels according to the brightness requirements of the display data, and adjusts the power supply voltage accordingly. This parameter change enables the system to optimize power efficiency by matching the power supply level to the actual display requirements.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamic power supply voltage adjustment for driver circuits based on the actual data content being displayed. The power management unit dynamically changes the power supply voltage level according to the brightness requirements of the current frame, transforming the static constant power supply into a dynamic adaptive power supply that matches the varying loading conditions of the microLED display.

Inventive Principle:

Principle #15Dynamics

3Power

If higher power supply voltage is provided to all drivers, then driving capability is improved, but power consumption increases

Engineering Contradiction:

Improvedriver driving capabilityVSAvoidoverall power consumption

Core Design Contradiction:

PowerVSUse of energy by moving object

Solution Approach 1:

The patent applies different power supply voltage levels to different driver circuits based on their specific requirements. The power management unit determines the appropriate power supply voltage for each driver according to the data content being displayed to that region. This local quality approach ensures that each driver receives the minimum necessary power to drive the required brightness level, avoiding unnecessary power consumption while maintaining adequate driving capability.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20260031015A1Display system

Publication Date: 2026.01.29 PRILIT OPTRONICS INC

AI summary

A display system includes a display panel divided into a plurality of display blocks arranged in rows and columns, each display block including a plurality of micro-light-emitting diodes (microLEDs) driven by a corresponding driver disposed in a corresponding display block; a power management unit (PMU) that dynamically provides different power-supply voltages for the drivers respectively during a line scan period or a frame scan period; and a timing controller that determines the different power-supply voltages for the PMU according to content of data to be display on the display panel.