Masking Circuit for Low-Frequency Gate Signal Ripple Suppression
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Solution Overview
Problem
Existing display devices face challenges in reducing power consumption while maintaining image quality, particularly when displaying still images or operating in always-on modes, due to difficulties in adjusting the driving frequency of gate signals.
Innovation Solution
A masking circuit is introduced to prevent ripples in gate signals by using a combination of switching elements and capacitors, allowing for variable frequency driving based on enable signals and clock signals, thereby optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the driving frequency of the display panel is decreased to reduce power consumption, then power consumption is reduced, but the gate signal reliability deteriorates due to ripple effects
Solution Approach 1:
The patent introduces a masking circuit as an intermediary component between the gate driver and the display panel. This masking circuit includes switching elements that are controlled by mask signals to selectively block or pass gate signals. By inserting this intermediary stage, the circuit can prevent ripple effects from propagating while still allowing the reduced-frequency driving mode to operate, thus resolving the contradiction between power consumption reduction and gate signal reliability
Solution Approach 2:
The gate driver circuit is segmented into multiple independent stages, with the masking circuit forming a distinct functional block. This segmentation allows the masking circuit to independently control signal transmission based on detected ripple conditions or reduced-frequency operation states, enabling selective signal blocking to prevent ripple propagation while maintaining the overall reduced power consumption mode
2Use of energy by moving object
If the driving frequency is reduced for still image display, then power consumption is reduced, but signal transmission stability deteriorates
Solution Approach 1:
The masking circuit serves as a mediator that stabilizes signal transmission during reduced-frequency operation. By controlling the switching elements with mask signals, the circuit ensures clean signal transitions and prevents ripple effects that would otherwise destabilize the signal transmission, thereby maintaining stability even when operating at lower frequencies for power savings
Data Source
AI summary
A masking circuit includes a ninth transistor including a control electrode connected to a second masking control node, a first electrode receiving a first clock signal, and a second electrode, a tenth transistor including a control electrode receiving a carry signal, a first electrode receiving a high gate voltage, and a second electrode connected to a first node, an eleventh transistor including a control electrode receiving a second enable signal, a first electrode connected to the first node, and a second electrode connected to the second masking control node, a twelfth transistor including a control electrode receiving a first enable signal, a first electrode connected to the second masking control node, and a second electrode connected to a second node, and a thirteenth transistor including a control electrode receiving the carry signal, a first electrode connected to the second node, and a second electrode receiving a low gate voltage.