MicroLED Display System Staggered Block Scanning for Power Peak Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional microLED display systems suffer from power peak issues and flicker effects due to peak current at the beginning of each horizontal scan period and visible brightness changes between cycles.
Innovation Solution
A display system with a microLED panel divided into blocks, where drivers provide data signals at different times within a horizontal scan period, using a PWM device to generate a divided PWM signal and adopting a multiple scan scheme to reduce flicker, with each driver including a PWM device that divides the duty cycle into sub-duty cycles and a logic OR gate for signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional microLED display systems use PWM scheme with peak current at the beginning of each horizontal scan period, then brightness control is achieved, but power peak issues occur
Solution Approach 1:
The display panel is divided into multiple display blocks, and the horizontal scan period is segmented into multiple sub- periods. Data signals are provided to different display blocks at different times within the horizontal scan period, distributing the current load and avoiding concentration of peak current at the beginning of each scan period.
Solution Approach 2:
The original PWM signal is divided into multiple sub-duty cycles that are spaced from each other, creating a divided PWM signal. This periodic distribution of duty cycles spreads the power consumption over time, eliminating the power peak while maintaining average brightness levels.
2Illumination intensity
If conventional microLED display systems scan all rows simultaneously, then complete frame display is achieved, but flicker effect occurs
Solution Approach 1:
The display panel is divided into multiple display blocks that can be scanned independently at different times. This segmentation allows the refresh operation to be distributed across multiple time slots, reducing the flicker effect while maintaining complete frame display capability.
Solution Approach 2:
The system adopts a multiple scan scheme where different display blocks are scanned in different time periods within the horizontal scan period. This dynamic scanning approach adapts the refresh timing to reduce visible flicker while maintaining overall productivity.
3Productivity
If data signals are provided to all display blocks simultaneously, then fast refresh is achieved, but power peak issue worsens
Solution Approach 1:
The horizontal scan period is divided into multiple sub-periods, and data signals are provided to different display blocks at different times. This temporal segmentation maintains overall refresh speed by utilizing the full scan period while distributing power consumption to avoid peaks.
Solution Approach 2:
The divided PWM signal with spaced sub-duty cycles provides periodic data delivery to display blocks. This periodic action maintains the refresh rate by ensuring all blocks are updated within the horizontal scan period while avoiding simultaneous power demands.
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 approach effectively reduces peak current and flicker, improving power efficiency and allowing for more rows and columns to be driven, while minimizing visible brightness changes between cycles.
Implementation Method 1
A pulse-width modulation (PWM) device 1114 configured to generate an original PWM signal, a duty cycle of which is proportional to brightness of data to be displayed
Implementation Method 2
a plurality of micro-light-emitting diodes (microLEDs)... based on group III/V (e.g., GaN) LED technology
Implementation Method 3
micro-light-emitting diodes (microLEDs), and the display panel is divided into a plurality of display blocks
Data Source
AI summary
A display system includes a display panel that includes a plurality of micro-light-emitting diodes (microLEDs), the display panel being divided into a plurality of display blocks; and a plurality of drivers correspondingly driving the plurality of display blocks. Data signals of each driver are provided to a corresponding display block at different times within a horizontal scan period.