OLED Display Panel Load Switching to Prevent PFM Display Ripples
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Solution Overview
Problem
In OLED display panels operating in low-frequency mode, power management chips can enter pulse frequency modulation (PFM) mode due to small current driving, leading to voltage fluctuations and display ripples, affecting image brightness and quality.
Innovation Solution
A display panel design incorporating a current detection module, gate control module, and optional load module, where the gate control module connects the load module to the power signal line when the current falls below a threshold, preventing the power management chip from entering PFM mode and stabilizing the voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the OLED display panel operates in low-frequency mode with small current driving, then power consumption is reduced, but the power management chip enters PFM mode causing voltage fluctuations and display ripples
Solution Approach 1:
The patent introduces an optional load module as an intermediary component connected to the power signal line. When the current detection module detects that the current is below the threshold, the gate control module activates to connect the optional load module to the power signal line, thereby stabilizing the voltage without requiring the power management chip to operate in PFM mode
Solution Approach 2:
The patent implements a feedback mechanism where the current detection module continuously monitors the current on the power signal line and provides feedback to the gate control module. Based on this feedback, the gate control module dynamically controls the connection state of the optional load module to maintain voltage stability
2Use of energy by moving object
If the power management chip enters PFM mode to handle small current driving, then power consumption is optimized, but voltage on the power signal line fluctuates causing display ripples
Solution Approach 1:
The optional load module serves as a mediator between the power signal line and the ground, providing a stable load path that prevents voltage fluctuations caused by PFM mode operation. This intermediary load ensures smooth voltage delivery to the OLED display panel, eliminating display ripples
Solution Approach 2:
The patent applies preliminary anti-action by proactively connecting the optional load module before voltage fluctuations can cause display ripples. The current detection module detects low current conditions in advance, and the gate control module activates the optional load module to preemptively stabilize the voltage, preventing the harmful effect of display ripples before it occurs
Data Source
AI summary
Display panel, display module and driving method are provided. The display panel includes a power management chip, a power signal line loading an electrical signal based on the power management chip, a current detection module, a gate control module, and an optional load module. The gate control modules is connected between the optional load module and the power signal line, and the optional load module is controlled by the gate control module and connected to the power signal line. The current detection module is configured to detect a first current loaded on the power signal line and control the gate control module to be turned on to connect the optional load module to the power signal line when the first current is less than a set threshold.