Emissive Display Pixel Segmentation for Power and Data Trade-offs
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Solution Overview
Problem
Emissive display systems face challenges in efficiently managing data storage and driving light-emitting devices across multiple modes of operation, particularly in preserving data during low-power or test modes, and in achieving high dynamic range with accurate color purity.
Innovation Solution
The display system incorporates pixels with digital memory and controllers that allow for multiple modes of operation, including a shift register chain for data storage and a light-emitting device driver that adjusts driving force based on greyscale data, using time division clock signals and bias voltages to optimize power usage and color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital memory stores incoming greyscale data for all pixels, then data storage capacity is improved, but power consumption increases when updating all pixels in every frame
Solution Approach 1:
The pixel array is segmented into multiple rows, with each row containing pixels that can be independently controlled. The controller divides the display area into first and second display areas, allowing selective updating of only certain row groups. This segmentation enables the system to store data for all pixels while updating only a subset in each frame, thereby reducing power consumption while maintaining data storage capacity.
2Reliability
If the system updates all pixels every frame, then display refresh quality is improved, but power consumption and data transmission load increase
Solution Approach 1:
The controller implements periodic action by alternating between updating first and second display areas in different frames. While only a subset of pixels is updated in each individual frame, all pixels are updated periodically across multiple frames. This approach maintains display refresh quality over time while reducing the power consumption and data transmission load associated with updating all pixels in every frame.
3Productivity
If shift register chains are used for data loading, then data storage efficiency is improved, but device complexity increases
Solution Approach 1:
The controller merges the functions of multiple shift register chains into a unified data loading architecture. Instead of implementing separate shift register chains for each row or pixel group, the system uses a consolidated approach where the controller manages data distribution to multiple rows simultaneously. This merging reduces the overall device complexity while maintaining the data storage efficiency benefits of shift register-based loading.
4Illumination intensity
If multiple bias voltages are used for high dynamic range, then color purity and brightness range are improved, but device complexity and power management complexity increase
Solution Approach 1:
The controller implements dynamic bias voltage selection, switching between first and second bias voltages applied to different row groups in different frames. This dynamic approach allows the display to achieve high dynamic range performance with improved color purity and brightness range by utilizing multiple bias voltages, while the temporal multiplexing of these voltages across different row groups keeps the overall device complexity manageable.
Data Source
AI summary
What is disclosed are systems and methods for emissive display systems constructed on integrated architecture platforms, for which the pixels are smart and can behave differently under different conditions to save power, provide better image quality, and/or conserve their value to reduce the power consumption associated with programming.