LED Display Flicker Reduction via Dynamic Frame Rate Control
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Solution Overview
Problem
Conventional light-emitting diode display devices experience issues with delayed display images and image flicker due to asynchronous frame rates, which are not adequately addressed by existing synchronization technologies, leading to uneven display brightness and torn images.
Innovation Solution
A light-emitting diode display device and control method that dynamically vary the frame rate by using a timing controller, scanning circuit, and driving circuit to generate periodic pulses during a light-emitting time period, ensuring continuous illumination of display pixels and reducing flicker through a higher operating rate for ramp control and emission signals compared to gate drive signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the frame rate of the display device is reduced for synchronization, then image tearing is reduced, but display brightness becomes uneven and image flicker occurs
Solution Approach 1:
The patent implements dynamic frame rate adjustment by allowing the display device to operate at different refresh rates (e.g., 60Hz, 144Hz, 240Hz) based on the input signal characteristics and performance requirements. The controller dynamically selects the appropriate frame rate, enabling the system to achieve smooth display without image tearing while maintaining uniform brightness through optimized pulse generation at each specific refresh rate.
Solution Approach 2:
The patent employs periodic light emission pulses with carefully controlled timing and duration. By generating multiple periodic pulses within each frame period and precisely controlling their width and spacing, the system maintains uniform display brightness while achieving the desired frame rate synchronization, thereby eliminating both image tearing and brightness unevenness.
2Productivity
If the frame rate is dynamically varied to match application requirements, then display smoothness improves, but image flicker and torn images occur
Solution Approach 1:
The patent incorporates feedback mechanisms where the controller monitors the input signal characteristics, current frame rate, and display performance. Based on this feedback, the controller dynamically adjusts the frame rate and pulse generation parameters to maintain optimal display quality. This closed-loop control ensures that when frame rate is varied to improve smoothness, the system automatically compensates to prevent flicker and image tearing.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting multiple parameters including frame rate, pulse width, pulse spacing, and duty cycle based on the specific application requirements. The controller modifies these parameters in real-time to achieve the desired balance between display smoothness and image quality consistency, allowing the display to adapt to different content types and performance levels without exhibiting flicker or tearing.
3Stability of the object's composition
If a fixed operation rate is maintained for vertical synchronization, then synchronization is achieved, but delayed display images occur
Solution Approach 1:
The patent implements dynamic frame rate adjustment by allowing the display device to operate at different refresh rates (e.g., 60Hz, 144Hz, 240Hz) based on the input signal characteristics and performance requirements. The controller dynamically selects the appropriate frame rate, enabling the system to achieve smooth display without image tearing while maintaining uniform brightness through optimized pulse generation at each specific refresh rate.
4Reliability
If the operating rate of control signals is increased to reduce flicker, then image stability improves, but energy consumption increases
Solution Approach 1:
The patent employs periodic light emission pulses with carefully controlled timing and duration. By generating multiple periodic pulses within each frame period and precisely controlling their width and spacing, the system maintains uniform display brightness while achieving the desired frame rate synchronization, thereby eliminating both image tearing and brightness unevenness.
Solution Approach 2:
The patent ensures continuous useful action by maintaining a steady stream of light emission pulses throughout each frame period. The controller optimizes the duty cycle and timing of these pulses to provide continuous illumination where needed while minimizing gaps, thereby reducing flicker perception without requiring excessively high operating rates that would increase energy consumption.
Data Source
AI summary
A light-emitting diode display device and a light-emission control method thereof are provided. The light-emitting diode display device includes a timing controller, multiple display pixels, and a scanning circuit. The display pixels form multiple display rows. The scanning circuit generates multiple scan signals and multiple light-emission signals that respectively drive the display rows. During a first data-writing time period of a first frame period, the timing controller provides multiple writing data to be respectively written into the display rows. During a light-emitting time period, the scanning circuit drives each of the light-emission signals to generate multiple pulses periodically according to a set period to drive the corresponding display rows. The light-emitting time period is after the first data-writing time period and before a second data-writing time period of a second frame period ends.