Display Panel Driving Method for Flicker-Free Frame Rate Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display panels experience flicker and poor user experience when switching between different frame refresh frequencies, requiring frequent data downloads and adjustments, which increases time consumption and can result in abnormal displays.
Innovation Solution
A display panel and driving method that maintain the same clock signal and pulse width of the scan signal across different frame refresh frequencies, allowing for seamless switching without changing the clock signal, and sharing gamma and demura data, thus reducing the need for frequent data downloads and adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the frame refresh frequency is switched from high frequency to low frequency by changing data download parameters, then the frame refresh frequency can be adjusted, but this causes flicker on the display screen and poor user experience
Solution Approach 1:
The patent changes the pulse width parameter of the clock signal to control the frame refresh frequency. By adjusting the pulse width (duty cycle) of the clock signal while keeping the frequency constant, the display can switch between different frame rates (e.g., 60Hz, 90Hz, 120Hz) without changing the clock signal frequency, thereby avoiding display flicker and maintaining screen stability.
Solution Approach 2:
The clock signal serves multiple functions: it simultaneously controls the shift register operation and determines the frame refresh frequency. By making the clock signal's pulse width adjustable, a single signal line can achieve both data shifting and frame rate control, eliminating the need for separate control mechanisms and reducing the risk of display instability during frequency switching.
2Adaptability or versatility
If the clock signal parameters are changed to adjust frame refresh frequency, then the frame rate can be modified, but this requires frequent data downloads and adjustments increasing time consumption
Solution Approach 1:
Instead of changing the clock signal frequency which would require complete data re-downloading, the patent changes only the pulse width parameter of the existing clock signal. This allows the display panel to adapt to different frame rates using the already-downloaded data, significantly reducing the time required for frequency switching and avoiding the need for frequent complete data downloads.
3Adaptability or versatility
If the scan signal pulse width is changed to match different frame rates, then the display can adapt to different frequencies, but this results in inconsistent display brightness and poor user experience
Solution Approach 1:
The patent changes the pulse width of the clock signal fed to the shift register, which indirectly controls the scan signal timing. By carefully designing the pulse width values (e.g., 16.67us for 60Hz, 18.52us for 90Hz, 20.83us for 120Hz), the system achieves different frame rates while maintaining consistent scan signal characteristics that preserve display brightness consistency across different frequencies.
Data Source
AI summary
Provided are a display panel and a driving method for a display panel. The display panel includes multiple levels of shift registers which are cascaded, a clock signal line and a trigger signal line. The display panel comprises a current display mode which comprises a current FPS, a current trigger signal and a current clock signal, where the current FPS is the same as a refresh frequency of the current trigger signal. The display panel further comprises a reference display mode which comprises a reference FPS, a reference trigger signal and a reference clock signal. An effective action duration of the current trigger signal comprises a first stage, and in the first stage, a pulse width of the current clock signal is the same as a pulse width of the reference clock signal. The current FPS is less than a reference FPS in the reference display mode.