Compensation Sequence Storage Density in Projection Displays
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Solution Overview
Problem
Current spatial light modulator (SLM) systems face challenges in increasing compensation sequence storage density, leading to high memory requirements and dither noise, especially when dealing with multiple color-wheel spin factors, where the available memory limits the number of sequences that can be used for nonlinearity compensation.
Innovation Solution
The solution involves a memory structure that includes a common first compensation sequence portion and unique second compensation sequence portions, which are used to construct a compensation sequence based on a particular effective transmission factor, allowing for reduced memory usage and improved dither noise performance by storing only the differences from a base sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple complete compensation sequences are stored in memory for different effective transmission factors, then nonlinearity compensation accuracy is improved, but memory requirements increase significantly
Solution Approach 1:
The patent divides each compensation sequence into three segments: a common beginning portion, a unique middle portion specific to each effective transmission factor, and a common ending portion. This segmentation allows the memory to store only the unique middle portions for multiple effective transmission factors while sharing the common beginning and ending portions, significantly reducing memory requirements while maintaining compensation accuracy.
Solution Approach 2:
The patent merges the common beginning and ending portions across multiple compensation sequences, allowing these portions to be stored once and reused for all effective transmission factors. The unique middle portions are stored separately and concatenated with the common portions during runtime to reconstruct the full compensation sequences, reducing overall memory usage.
2Reliability
If more memory is allocated for compensation sequences, then dither noise performance improves, but device complexity and cost increase
Solution Approach 1:
By segmenting compensation sequences into common and unique portions, the patent enables efficient memory management that provides sufficient compensation sequences for good dither noise performance without requiring excessive memory allocation. The segmentation allows the system to store multiple unique middle portions while sharing common portions, achieving a balance between sequence quantity and memory capacity.
Solution Approach 2:
The patent implements a dynamic sequence construction mechanism where the full compensation sequence is assembled at runtime by concatenating the common beginning portion, the selected unique middle portion corresponding to the current effective transmission factor, and the common ending portion. This dynamic approach allows flexible adaptation to different operating conditions without requiring all possible sequences to be permanently stored in full.
3Adaptability or versatility
If the number of stored compensation sequences is increased to cover all color-wheel spin factors, then compensation accuracy across all operating conditions is improved, but the available memory is quickly exhausted
Solution Approach 1:
The patent segments compensation sequences into common and unique portions, allowing the same common beginning and ending portions to be shared across multiple color-wheel spin factors. Only the unique middle portions that differ between spin factors are stored separately, enabling comprehensive compensation coverage for all spin factors while using a limited memory capacity.
Solution Approach 2:
The common beginning and ending portions serve multiple functions across different effective transmission factors and color-wheel spin factors. These universal portions are reused for all compensation sequences, while only the factor-specific unique middle portions are stored separately, achieving multi-factor compensation coverage with efficient memory utilization.
Data Source
AI summary
An apparatus for, and method of, increasing compensation sequence storage density in a projection visual display system and a projection visual display system incorporating the apparatus or the method. In one embodiment, the apparatus includes: (1) a memory containing a first compensation sequence portion that is common to a plurality of effective transmission factors and a plurality of second compensation sequence portions that are unique to a corresponding plurality of effective transmission factors and (2) a compensation sequence generator coupled to the memory and configured to construct a compensation sequence for use in the projection visual display system using the first compensation sequence portion and one of the plurality of second compensation sequence portions selected as a function of a particular effective transmission factor.