Display Driving Circuit Refresh Rate Adjustment via Frame Porch Insertion
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Solution Overview
Problem
Conventional methods for reducing display power consumption, such as the skip frame method, limit refresh rate adjustments to integer multiples of the original rate, restricting flexibility in achieving desired refresh rates for different display scenarios.
Innovation Solution
A display driving circuit with a detection unit, counting unit, and adjusting unit that inserts frame porch intervals to adjust the refresh rate using the flexible frequency switching method, allowing for arbitrary refresh rates by calculating the second refresh rate as [(L*N)/(L*N+M)]*RR(MAX), where L and M are positive integers, and L≥M.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the conventional skip frame method is used to reduce refresh rate, then power consumption is reduced, but the refresh rate can only be adjusted to integer multiples of the original rate, limiting flexibility
Solution Approach 1:
The frame period is segmented into multiple sub-intervals (first frame period and second frame period) with different refresh rates. The detection unit divides the frame into N equal time intervals, and the adjusting unit selectively applies different refresh rates to different segments, enabling arbitrary refresh rates rather than only integer multiples of the original rate.
Solution Approach 2:
The system dynamically adjusts the refresh rate by inserting frame porch intervals based on detected pulse positions. The counting unit tracks frames and the adjusting unit inserts M frame porch interval increasing units every L frames, creating a dynamic refresh rate adjustment mechanism that can achieve any desired refresh rate within the range.
2Use of energy by stationary object
If the refresh rate is reduced to save power, then energy consumption decreases, but the emission control signal cannot maintain normal operation during non-emission periods, causing brightness changes
Solution Approach 1:
The emission control signal operates periodically with N pulses per frame, creating N equal time intervals. This periodic structure allows the system to maintain normal emission control operation during active periods while enabling power savings during porch intervals, thereby maintaining brightness stability while reducing overall power consumption.
Solution Approach 2:
The system changes the timing parameters of the emission control signal by inserting frame porch intervals at specific positions detected from N pulses. This parameter adjustment allows the emission control signal to maintain proper timing and amplitude during active display periods, ensuring brightness stability while enabling power reduction through selective porch interval insertion.
3Use of energy by stationary object
If integer-based refresh rate division is used, then power consumption is reduced, but arbitrary refresh rates cannot be achieved, restricting adaptability to different display scenarios
Solution Approach 1:
The system adds a temporal dimension to refresh rate control by inserting frame porch intervals of variable duration (1/N frame) at different positions. This transforms the discrete integer-based refresh rate adjustment into a continuous adjustable parameter, enabling arbitrary refresh rates by controlling the number and position of inserted porch intervals.
Data Source
AI summary
A display driving circuit applied to a display includes a detection unit, a counting unit and an adjusting unit. The detection unit is configured to detect N pulses of an emission control signal of the display in a frame and define a frame porch interval increasing unit accordingly. The frame porch interval increasing unit equals to 1/N frame. N is a positive integer. The counting unit is coupled to the detection unit and configured to count frames according to a first refresh rate. The adjusting unit is coupled to the detection unit and the counting unit and configured to insert M frame porch interval increasing units every time when the counting unit counts L frames to adjust the first refresh rate to a second refresh rate, wherein the second refresh rate is lower than the first refresh rate. L and M are positive integers and L≥M.