Display DC-DC Converter Mode Switching for Low-Luminance Power Loss
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Solution Overview
Problem
As the size and luminance range of display panels increase, the DC-DC converter in display devices experiences reduced conversion efficiency and increased power loss due to large internal resistors and repeated switching, leading to unnecessary power consumption and heat generation, especially at low luminance levels.
Innovation Solution
A DC-DC converter is designed with a normal mode and a power saving mode, utilizing a first and second converter that operate in different driving manners based on inductor currents and mode control signals, with reduced transistor turn-on times and discontinuous periods to minimize power consumption and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel size and luminance range are increased, then the driving current range is expanded, but the DC-DC converter efficiency is reduced and power loss is increased
Solution Approach 1:
The patent implements dynamic switching between normal mode and power saving mode based on the magnitude of driving current. The mode selector dynamically adjusts the operating mode of the DC-DC converter, enabling it to adapt to different luminance levels and current ranges, thereby maintaining efficiency across the expanded driving current range while reducing power loss.
Solution Approach 2:
The patent changes the operating parameters of the DC-DC converter by switching between different driving manners (first, second, and third driving manners) with different transistor turn-on times. This parameter adjustment allows the converter to optimize its efficiency across different current magnitudes, resolving the contradiction between expanded adaptability and energy loss.
2Reliability
If the DC-DC converter operates with repeated switching, then the voltage conversion is maintained, but unnecessary power consumption and heat generation increase
Solution Approach 1:
The patent implements periodic action by selectively enabling switching operations only when necessary. In power saving mode, the converter reduces the frequency of transistor switching while maintaining voltage conversion capability, thereby reducing power consumption and heat generation associated with repeated switching operations.
Solution Approach 2:
The patent extracts and separates the voltage conversion function from continuous switching operations. By using the mode selector to determine when switching is necessary, the system maintains voltage conversion reliability while eliminating unnecessary switching cycles that cause power consumption and heat generation.
3Loss of energy
If the transistor turn-on times are reduced in power saving mode, then power loss is decreased, but the conversion efficiency may be compromised
Solution Approach 1:
The patent dynamically adjusts transistor turn-on times based on the operating mode. In power saving mode, turn-on times are reduced to minimize power loss, while in normal mode, full turn-on times are used to maintain optimal conversion efficiency. The mode selector enables this dynamic adaptation, resolving the contradiction between power loss reduction and efficiency maintenance.
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
The solution effectively reduces power loss and heat generation by optimizing the driving frequencies and modes of the DC-DC converter, improving conversion efficiency and extending the power saving mode's luminance level without additional components, thus lowering costs and enhancing display performance.
Implementation Method 1
a first inductor current generated by alternately turning on a plurality of transistors therein
Data Source
AI summary
A direct current-to-direct current (“DC-DC”) converter includes: a first converter which outputs a first power voltage in a normal mode or a power saving mode based on a inductor current generated therein, where the first converter operates in a first driving manner in the normal mode, and operates in a second driving manner in the power saving mode; a second converter which outputs a second power voltage based on a inductor current generated therein, where the second converter operates in a third driving manner in the power saving mode, and a magnitude of the second power voltage in the power saving to mode is different from that in the normal mode; and a mode selector which supplies a mode control signal to the first and second converters, where the first and second converters are driven in the normal mode or the power saving mode based on the mode control signal.