Sub-pixel Mapping for Four-Primary Displays
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Solution Overview
Problem
Current displays with three primary sub-pixels face challenges in mapping three-primary input signals to four primary sub-pixels, leading to a decrease in resolution and the introduction of color artifacts due to sub-sampling processes.
Innovation Solution
A method that sub-samples four-primary input signals by assigning the first, second, and third components of one input sample to the first, second, and third sub-pixels, and the fourth component of another sample to the fourth sub-pixel, allowing for efficient multi-primary conversion without filtering, thereby maintaining luminance and preventing color errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sub-sampling is performed to map three-primary input signal to four primary sub-pixels, then the display can operate with four sub-pixels, but the resolution decreases
Solution Approach 1:
The patent divides the mapping process into separate operations: first mapping odd-numbered input samples to the fourth sub-pixel, then mapping even-numbered input samples to the first three sub-pixels. This segmentation allows independent optimization of each mapping path and enables the use of different input samples for different sub-pixel types, thereby maintaining resolution while supporting four-sub-pixel display capability.
Solution Approach 2:
The patent applies different mapping strategies to different sub-pixels based on their specific characteristics. The fourth sub-pixel receives data from odd-numbered input samples, while the first three sub-pixels receive data from even-numbered input samples. This local differentiation optimizes the quality of data assignment for each sub-pixel type, preventing uniform sub-sampling degradation and maintaining overall resolution.
2Productivity
If conventional sub-sampling mapping is used, then the input signal can be converted to four drive signals, but color artifacts are introduced
Solution Approach 1:
The patent segments the input signal mapping into two distinct paths: odd-numbered samples are assigned to the fourth sub-pixel, while even-numbered samples are assigned to the first three sub-pixels. This segmentation prevents the mixing of color information that causes artifacts in conventional uniform sub-sampling, while maintaining efficient conversion by processing samples in sequence.
Solution Approach 2:
Instead of uniformly distributing input samples across all four sub-pixels as in conventional approaches, the patent inverts the mapping strategy by assigning odd samples specifically to the fourth sub-pixel and even samples to the first three. This inversion of the conventional mapping approach eliminates color artifacts by preventing inappropriate color mixing during the conversion process.
3Device complexity
If all sub-pixels receive drive values from the same input pixel, then the mapping is simple, but the resolution is reduced
Solution Approach 1:
The patent segments the input pixel indexing into odd and even numbers, creating two distinct mapping streams. Odd-numbered input pixels map to the fourth sub-pixel, while even-numbered input pixels map to the first three sub-pixels. This segmentation increases mapping complexity only slightly while significantly improving resolution by preventing the uniform down-sampling that would occur if all sub-pixels received data from the same input pixel.
Data Source
AI summary
A method of mapping a four primary input signal to sets of four sub-pixels of a display device, the method including sub-sampling the input samples of the four primary input signal by assigning the first, second and third input signals of a particular input sample to the first, second and third sub-pixels, producing first, second and third primary colors of a particular set of four adjacent sub-pixels, respectively, and the fourth input signal of a further input sample to the fourth sub-pixel, producing a fourth color of said particular set of the four adjacent sub-pixels, wherein the particular input sample and the further input sample are associated with adjacent positions on the display device.