OLED Display Control Circuit for VRR Flickering Compensation
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Solution Overview
Problem
OLED display devices experience image flickering due to changes in frame rates caused by the variable refresh rate (VRR) function, which existing technologies have not effectively addressed.
Innovation Solution
An OLED display control circuit and method that includes a counting unit, judgment unit, remainder calculation unit, and signal compensation unit to dynamically adjust the emission control signal by comparing display line counts between current and previous frames, calculating remainders, and compensating for incomplete signal periods to reduce flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable refresh rate (VRR) function is implemented to improve adaptability, then adaptability is improved, but image flickering occurs due to frame rate changes
Solution Approach 1:
The control circuit detects frame rate changes in advance and proactively adjusts the emission control signal parameters before the flickering can occur. By comparing the current frame rate with the previous frame rate and calculating the difference, the system preemptively modifies the emission signal to match the new frame rate, preventing display instability rather than reacting to it after it occurs.
Solution Approach 2:
The invention dynamically changes the parameters of the emission control signal based on the detected frame rate. When a frame rate change is detected, the control circuit calculates the difference between current and previous frame rates, then adjusts the emission signal's frequency and timing parameters accordingly. This parameter adaptation allows the display to maintain stable operation across variable frame rates.
2Device complexity
If emission control signal period is fixed to simplify control, then device complexity is reduced, but incomplete signal periods cause flickering when frame rates change
Solution Approach 1:
The invention transforms the fixed emission control signal into a dynamic signal that automatically adapts to frame rate changes. The control circuit continuously monitors the frame rate and adjusts the emission signal period in real-time. When the frame rate changes, the system calculates the required signal period adjustment and modifies the emission signal accordingly, ensuring complete signal periods are always achieved regardless of frame rate variations.
3Adaptability or versatility
If frame rate changes are allowed to improve adaptability, then adaptability is improved, but incomplete emission control signal periods occur causing flickering
Solution Approach 1:
The control circuit implements a feedback mechanism where the current frame rate is continuously compared with the previous frame rate. Based on this feedback, the system calculates the difference and adjusts the emission control signal parameters to ensure complete signal periods. The feedback loop ensures that any frame rate changes are compensated for, maintaining signal period completeness and preventing flickering while allowing frame rate variability.
Data Source
AI summary
An organic light emitting diode (OLED) display control circuit and a control method thereof are provided. The OLED control circuit includes a counting unit, a judgment unit, a remainder calculation unit and a signal compensation unit. The counting unit counts display lines of a current frame according to a vertical synchronization signal to generate a first count value. The judgment unit compares the first count value and a second count value to generate a judgment result. The second count value represents the number of display lines of a previous frame preceding to the current frame. The remainder calculation unit calculates a remainder generated by dividing the first count value by a period of an emission control signal. The signal compensation unit adjusts the emission control signal to compensate for an incomplete period of the emission control signal occurring in the end of the current frame period.