Digital Driver Circuitry for AMOLED Motion Artifact Reduction
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Solution Overview
Problem
Active-matrix displays, such as AMOLEDs, face motion artifacts like motion blur, dynamic false contours, and color splitting due to impulse-driving techniques, which degrade the viewing experience, especially with increasing gray scales and require higher refresh rates and additional black fields that reduce light output and cause eye discomfort.
Innovation Solution
A method and digital driver circuitry that divide the field into sub-fields with time intervals for each bit of the digital image code, ensuring the most significant bits are regularly distributed across sub-fields, allowing for efficient data transfer and reduced motion artifacts by optimizing the timing of light emission patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If impulse-driving techniques are used to drive display pixels, then the display can achieve digital control and fast switching, but motion artifacts such as dynamic false contours and color splitting occur
Solution Approach 1:
The field period is divided into multiple sub-fields, and each sub-field is further divided into multiple time slots. This segmentation allows different bits of the digital image code to be written at different time slots within sub-fields, distributing the light emission events more evenly throughout the field period rather than concentrating them, thereby reducing motion artifacts while maintaining digital control
Solution Approach 2:
The patent implements periodic writing of digital code bits to display pixels across multiple sub-fields and time slots. By systematically distributing the writing operations periodicity across the field period, the light emission becomes more evenly spaced in time, reducing the perception of dynamic false contours and motion artifacts
2Speed
If the refresh rate is increased to reduce motion blur, then motion estimation smoothness improves, but higher transistor performance is required
Solution Approach 1:
Instead of increasing the overall refresh rate, the patent segments the field period into multiple sub-fields with multiple time slots each. This allows the same amount of data to be transferred using slower transistor switching within each time slot, while the cumulative effect across all sub-fields achieves smooth motion display without requiring ultra-high refresh rates
3Object-generated harmful factors
If additional black fields are inserted to reduce motion artifacts, then motion blur is reduced, but average light output is reduced and displayed content appears darker
Solution Approach 1:
The patent maintains continuous light emission across the entire field period by distributing data writing operations across multiple sub-fields and time slots without inserting black fields. Each time slot contains useful light emission contributing to the final image, ensuring high average light output while still reducing motion artifacts through the distributed timing of bit writing
4Object-generated harmful factors
If sub-fields with large off-periods are used to reduce false contour amplitudes, then dynamic false contours are reduced, but data transfer efficiency decreases
Solution Approach 1:
The patent segments the field into multiple sub-fields with multiple time slots, allowing data bits to be written in distributed fashion throughout the field period. This eliminates large off-periods between light emission events while still reducing false contour amplitudes through the systematic distribution of writing operations across time slots
Solution Approach 2:
By implementing periodic writing of code bits across time slots and sub-fields, the patent maintains continuous useful action with minimal off-periods, thereby preserving data transfer efficiency while reducing motion artifacts through the periodic distribution of light emission events
Data Source
AI summary
A method includes representing dots of an image to be displayed within a field by a digital image code. The field is divided into sub-fields which are further divided into a first and second time interval which respectively comprise a first and a second number of equally long time slots. Time slots are assigned to each bit of the digital image code according to each bit's significance. Successive time slots of the first time interval are assigned to one of the bits of the image code and successive time slots of the second time interval are assigned to a different one of the bits of the image code. Within the duration of at least one sub-field, each rows is selected twice for respectively writing a first bit of the image code during the first time interval and writing a second bit of the image code during the second time interval.