LED Display Driving Method for Heat Distribution Balancing
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Solution Overview
Problem
Modern display devices face challenges in efficiently driving multiple LED strings due to increased power consumption and heat generation, particularly in XY scanning structures, where balancing heat distribution between scan transistors and current regulators is crucial.
Innovation Solution
A driving method that adjusts LED cathode voltages and driving currents by increasing pulse current levels and reducing duty cycle ratios for channels with voltages exceeding minimal operable levels, and adjusts voltage drops over scan transistors to balance heat distribution and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If more LED strings are accommodated in one display device to achieve higher resolution, then display resolution is improved, but power consumption increases
Solution Approach 1:
The patent merges multiple LED driving channels into a single integrated LED driver that uses XY scanning technology. Instead of having separate driving circuits for each LED string, the system combines them into one driver that sequentially activates different combinations of scan and data channels, thereby reducing overall power consumption while maintaining the ability to drive multiple LED strings for high resolution display.
Solution Approach 2:
The patent implements periodic scanning action where the LED driver sequentially activates scan channels and data channels in a time-division manner. The driver periodically cycles through different scanning patterns, activating only the necessary channels at each moment, which reduces average power consumption compared to continuously powering all LED strings simultaneously.
2Productivity
If more LED driving circuits are included to drive more LED strings, then driving capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent designs a universal LED driver that can drive multiple LED strings through XY scanning rather than requiring dedicated driving circuits for each string. The single driver performs multiple functions by sequentially controlling different channel combinations, eliminating the need for multiple separate driving circuits and reducing device complexity.
Solution Approach 2:
The patent combines multiple driving functions into a single integrated driver that uses scan transistors and current regulators in a shared architecture. By merging the driving circuits and using a common set of components that can be reconfigured through scanning, the system achieves the ability to drive more LED strings without proportionally increasing device complexity.
3Productivity
If XY scanning structure is used to drive more LED strings, then driving capability is improved, but heat generation increases
Solution Approach 1:
The patent uses periodic scanning to activate LED strings in time-division manner, where not all LED strings are powered simultaneously. This periodic activation pattern reduces the cumulative heat generation compared to continuous operation of all LED strings, while still maintaining the capability to drive the complete display through sequential scanning.
4Productivity
If scan transistors and current regulators operate in XY scanning structure, then driving capability is improved, but heat distribution imbalance occurs
Solution Approach 1:
The patent applies local quality adjustment by individually controlling the operation characteristics of scan transistors and current regulators based on their specific operational demands. The system adjusts gate voltages and current levels for different channels to ensure that heat generation is balanced across all components, preventing localized overheating while maintaining full driving capability.
Data Source
AI summary
A driving method, for a controller in a display apparatus, is disclosed. The display apparatus includes LED strings, scan transistors, current regulators and a power converter. The driving method includes following steps. LED cathode voltages are detected on nodes between the LED strings and the current regulators. When a first LED cathode voltage corresponding to a first scanning channel is equal to a minimal operable voltage of the current regulators and a second LED cathode voltage corresponding to a second scanning channel exceeds the minimal operable voltage of the current regulators, a voltage drop over one corresponding scan transistor is increased on the second scanning channel.