Dual-Modulator Display Rendering via Precomputed Lookup Tables
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Solution Overview
Problem
Current systems for displaying images on dual-modulator displays face performance limitations due to computationally expensive processes in deriving signals for light source and display layers, leading to potential frame rate issues that can distract the viewer and negatively impact the image viewing experience.
Innovation Solution
The solution involves reducing computational costs by performing calculations in a lower precision domain, decomposing point spread functions, and using interpolation techniques to determine and scale effective luminance patterns at reduced spatial resolutions, allowing for faster image rendering without significant artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If computationally expensive processes are used to derive signals for light source and display layers, then image quality is maintained, but frame rate decreases causing noticeable pauses between successive frames
Solution Approach 1:
The patent segments the computationally expensive signal derivation process into multiple independent stages: pre-computing lookup tables for light source layer signals, calculating effective luminance patterns, and deriving display layer signals. This segmentation allows parallel processing and optimization of each stage, significantly reducing overall processing time while maintaining image quality.
Solution Approach 2:
The patent performs preliminary computations offline to create lookup tables containing pre-calculated light source layer signals and effective luminance patterns. These pre-computed data structures are stored and reused during real-time operation, eliminating the need to recalculate them for every frame and dramatically reducing processing time per frame.
2Measurement precision
If high precision calculations are performed for effective luminance patterns, then rendering accuracy is improved, but computational cost increases significantly
Solution Approach 1:
The patent changes the precision parameters used in different computational stages. Lookup tables are pre-computed with high precision (e.g., 16-bit or floating point) to ensure accuracy. During real-time rendering, these high-precision values are used for critical calculations like effective luminance patterns, while less critical operations use lower precision (e.g., 8-bit) to reduce computational load. This selective precision approach maintains rendering accuracy where needed while improving overall processing speed.
Data Source
AI summary
Apparatus and methods are provided that employ one or more of a variety of techniques for reducing the time required to display high resolution images on a high dynamic range display having a light source layer and a display layer. In one technique, the image resolution is reduced, an effective luminance pattern is determined for the reduced resolution image, and the resolution of the effective luminance pattern is then increased to the resolution of the display layer. In another technique, the light source layer's point spread function is decomposed into a plurality of components, and an effective luminance pattern is determined for each component. The effective luminance patterns are then combined to produce a total effective luminance pattern. Additional image display time reduction techniques are provided.