Display Panel Shift Register Circuit for Stable Low-Frequency Scanning
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Solution Overview
Problem
Display devices experience fluctuations in scanning signals when the driving circuit does not output valid pulses for a long time, affecting the display effect.
Innovation Solution
A display panel with a driving circuit comprising cascaded shift register units, including a driving control module, stage transfer module, transmission control module, auxiliary control module, and scanning module, which control the output signals to stabilize scanning signals and enable zoned and frequency-controlled display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the driving circuit stops providing valid pulses to low-frequency display areas for an extended period, then power consumption is reduced, but the scanning signal fluctuates and display quality deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-charging the scanning signal line to a target voltage level before entering the low-frequency display period. The charging module charges the scanning signal line to a second voltage level (different from the first voltage level used during normal display) in advance, so that when valid scanning signals are suspended, the signal line maintains a stable voltage level, preventing fluctuations and ensuring display quality is maintained even during extended low-frequency periods
Solution Approach 2:
The patent changes the voltage level parameter of the scanning signal line based on the display frequency requirements. During high-frequency display, the scanning signal line operates at a first voltage level, while during low-frequency display, it switches to a second voltage level. This parameter change allows the system to optimize power consumption while maintaining signal stability through the charging module that actively manages the voltage level transitions
2Reliability
If the driving circuit continuously provides valid scanning pulses to all pixels, then scanning signal stability is maintained, but power consumption increases
Solution Approach 1:
The patent segments the display area into high-frequency display areas and low-frequency display areas, allowing different scanning signal strategies to be applied to different segments. The charging module is selectively activated based on the display requirements of specific segments, enabling the system to maintain signal stability where needed while reducing power consumption in areas where low-frequency display is sufficient
Solution Approach 2:
The patent implements periodic charging of the scanning signal line through the charging module, which activates at specific intervals or conditions rather than continuously. The charging operation occurs periodically to maintain the voltage level on the scanning signal line during low-frequency display periods, providing just enough intervention to ensure stability without continuous power consumption
Data Source
AI summary
A shift register unit includes a driving control module configured to receive an input signal and control a signal of a first output node and a signal of a second output node, a stage transfer module configured to receive a signal of a first output node and a signal of a second output node and control a stage transfer signal, a transmission control module configured to receive a stage transfer signal and a transmission control signal and control a signal of a third output node, an auxiliary control module configured to receive a signal of a second output node, a signal of a third output node and an auxiliary control signal and control a signal of a fourth output node, and a scanning module configured to receive at least a signal of a third output node and a signal of a fourth output node and control a scanning signal.