Display Controller Black Data Insertion for MPRT Reduction
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Solution Overview
Problem
Display devices experience image mixing between frames due to gradual updating of data signals, leading to luminance step differences at the end of frame periods, which affect motion picture response time (MPRT).
Innovation Solution
Implementing a black data insertion technique, where a black image is displayed between adjacent frames by adjusting the cycle and width of data enable signals and image data, and appending black pulses and line data to ensure uniform distribution of pulses throughout the frame period, thereby reducing luminance step differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If black data insertion is applied to optimize MPRT, then motion picture response time is improved, but device complexity increases due to additional signal processing operations
Solution Approach 1:
The controller performs preliminary actions by pre-calculating the number of black insertion pulses and adjusting the cycle of data enable signals before the actual frame display. The system determines in advance how many black insertion pulses (M pulses) are needed based on the frame period and existing pulse count (N pulses), then uses this information to modify subsequent signal generation, avoiding complex real-time calculations during display.
Solution Approach 2:
The invention changes key parameters of the data enable signal, specifically the cycle duration and the number of pulses inserted. By adjusting the cycle of data enable signals and inserting M black insertion pulses into the N existing pulses, the system optimizes the temporal distribution of signals to reduce luminance step differences while maintaining manageable processing complexity through parameter-based control rather than structural complexity.
2Manufacturing precision
If data processing operations are performed on image data, then image quality is improved, but processing time increases leading to luminance step differences at frame end
Solution Approach 1:
The controller performs data processing operations in advance during the frame period, specifically processing image data before the black data insertion phase. By completing the data processing (including gamma correction and other image quality enhancements) before the final black insertion pulses are generated, the system ensures that processing time is allocated efficiently without causing luminance step differences at the frame end.
Solution Approach 2:
The frame period is segmented into distinct phases: a first phase for data processing operations on image data, and a second phase for black data insertion with adjusted cycle signals. This segmentation allows the controller to allocate specific time windows for processing tasks, ensuring that image quality enhancement is completed before the final display phase, thereby preventing luminance step differences.
3Stability of the object's composition
If black insertion pulses are appended to data enable signals, then luminance uniformity is improved, but signal generation complexity increases
Solution Approach 1:
The system achieves luminance uniformity by changing the parameter of the data enable signal cycle and by appending a calculated number of black insertion pulses (M pulses) to the existing N pulses. This parameter-based approach, where M is determined based on the frame period and existing pulse characteristics, provides uniform luminance distribution across the frame without requiring complex real-time signal generation or adjustment mechanisms.
Data Source
AI summary
A display device includes a display panel, controller configured to generate a second data enable signal and second image data based on a first data enable signal and first image data, and generate an output data enable signal and output image data by performing a black data insertion operation, and data driver configured to provide data signals based on the output data enable signal and the output image data, where the controller obtains a delay time between the first data enable signal and the second data enable signal or the first image data and the second image data, determines a number of subsequent pulses of the output data enable signal during a period from one time point within a frame period to an end time point of the frame period, and adjusts a cycle of the subsequent pulses based on the delay time and the number of the subsequent pulses.