Display Power IC Phase Inversion for Noise-Canceling Switching
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Solution Overview
Problem
Display devices suffer from noise characteristics that degrade performance, particularly in thin and low-power devices like OLEDs, due to the lack of synchronized switching signals from power integrated circuits.
Innovation Solution
Implementing a display device with a first and second power IC that generate switching signals with the same phase width, inverted shapes, and equal magnitude, using a timing controller to supply data enable signals and a frequency generator to synchronize clock signals, and incorporating delay circuits and inverters to adjust signal phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional power ICs are used without inverted switching signals, then the device structure is simple, but noise characteristics deteriorate
Solution Approach 1:
The power management system is divided into multiple independent power ICs (first power IC and second power IC), each generating switching signals. This segmentation allows individual optimization of each power IC's switching signal to reduce noise, while maintaining overall system functionality through coordinated operation of the segmented components.
Solution Approach 2:
The patent applies inversion by generating switching signals with opposite phases from different power ICs. The first power IC generates a switching signal with a rising edge, while the second power IC generates an inverted switching signal with a falling edge. This inversion causes noise waves from different power ICs to cancel each other out, significantly reducing overall noise characteristics.
2Object-affected harmful factors
If multiple power ICs with inverted switching signals are used, then noise characteristics improve, but device complexity increases
Solution Approach 1:
Multiple power ICs are designed with identical functional capabilities to generate switching signals, but operating in complementary modes. Each power IC serves the dual function of power generation and noise cancellation, eliminating the need for separate noise cancellation circuits and reducing overall system complexity despite the presence of multiple ICs.
Solution Approach 2:
The system implements phase detection and adjustment mechanisms where the switching signals from multiple power ICs are monitored and adjusted to maintain precise phase opposition. This feedback control ensures that the inverted switching signals remain synchronized and continue to cancel noise effectively, maintaining noise reduction performance while adapting to system variations.
Data Source
AI summary
The present disclosure relates to a display device, and more specifically, to a display device in which noise characteristics are improved by outputting mutually inverted switching signals from a first power integrated circuit (IC) and a second power IC. According to the present disclosure, the noise characteristics of the display device are improved by outputting the mutually inverted switching signals from the first power IC and the second power IC.