Bit Sequence Reordering for Display Power Reduction
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Solution Overview
Problem
Existing electronic display technologies, such as LED, OLED, and μ-LED displays, consume significant power due to frequent toggling of row drivers when processing bit sequences for gray level values, leading to increased power consumption and electromagnetic interference.
Innovation Solution
Reordering the bit sequence based on the location of display pixels or bit positions within the sequence, rather than processing them pixel-by-pixel, reduces the number of toggles by maintaining consistent bit values for larger portions of the image, thereby minimizing power consumption and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If bit sequences are processed pixel-by-pixel in conventional order, then image data can be displayed correctly, but the number of row driver toggles increases leading to higher power consumption
Solution Approach 1:
The bit sequence is segmented and reorganized by processing bits of the same significance position together across multiple pixels, rather than processing all bits for one pixel before moving to the next. This segmentation allows the row driver to maintain stable states longer, reducing toggles and power consumption while maintaining display functionality.
Solution Approach 2:
The patent changes the processing dimension from pixel-by-pixel (horizontal traversal) to bit-position-by-bit-position (vertical traversal through significance levels). This dimensional reorganization groups operations by bit significance rather than by pixel location, enabling the row driver to process multiple pixels at the same bit level before transitioning, thereby reducing the frequency of toggles.
2Object-affected harmful factors
If row drivers toggle frequently to process bit sequences, then complete image data can be rendered, but electromagnetic interference increases
Solution Approach 1:
By segmenting the bit sequence processing into groups based on bit significance position, the patent reduces the total number of row driver transitions. This segmentation strategy groups together operations that can be performed without toggling, thereby reducing electromagnetic interference while completing the full image rendering process.
Solution Approach 2:
The patent enables continuous processing of bits at the same significance level across multiple pixels without unnecessary interruptions or toggles. This continuity reduces the frequency of row driver state changes, thereby minimizing electromagnetic interference while ensuring complete and accurate image data rendering.
3Device complexity
If conventional pixel-by-pixel processing is used, then implementation is straightforward, but value variance in bit sequence increases causing more toggles
Solution Approach 1:
The patent introduces a new processing dimension by organizing bits according to their significance position rather than pixel order. This dimensional change requires additional processing logic to reorganize the bit sequence, but it dramatically reduces value variance and the resulting number of row driver toggles, offsetting the increased processing complexity with significant energy savings.
Data Source
AI summary
A display device has a timing controller and a microdriver. The timing controller receives multiple bit sequences of image data for multiple pixels of the display device. The timing controller also reorders the multiple bit sequences based on a significant bit position within the multiple bit sequences. Each of the multiple bit sequences corresponds to a respective individual pixel of the multiple pixels. The microdriver receives the reordered multiple bit sequences and drives the multiple pixels using the reordered plurality of bit sequences.