Subpixel Sampling Rate Conversion for Display Aliasing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display technologies face challenges in maintaining high-quality image reproduction when the number of pixels in an input image signal exceeds the number of pixels in a display device, leading to aliasing interference and deteriorated picture quality.
Innovation Solution
A sampling rate converting system that converts high-definition image signals with more pixels than the display into subpixel sampling rates, using a subpixel number-of-pixel converter, image feature detector, and mixer to suppress aliasing interference and pseudo color interference, allowing for high-quality image reproduction without filtering the signal band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sampling rate is converted from high-definition signal (1920 cpL) to display resolution (853 cpL), then the image can be displayed on the display device, but aliasing interference occurs and picture quality deteriorates
Solution Approach 1:
The patent segments the display pixel into multiple subpixels (e.g., 3 subpixels per pixel in RGB arrangement). By treating subpixels as independent sampling units, the effective sampling rate increases from 853 cpL to 2560 cpL (853×3), which satisfies the Nyquist criterion for high-definition signals and prevents aliasing interference during sampling rate conversion
Solution Approach 2:
The patent exploits the spatial dimension within each pixel by utilizing multiple subpixels arranged in specific patterns (e.g., RGB stripes). This dimensional expansion allows the system to achieve higher effective sampling rates without increasing the physical pixel count, thereby maintaining display compatibility while preventing aliasing
2Object-affected harmful factors
If the signal band is suppressed by filtering to prevent aliasing, then aliasing interference is reduced, but the resolution and picture quality are deteriorated
Solution Approach 1:
By segmenting each pixel into multiple subpixels, the patent achieves effective oversampling without signal filtering. The increased sampling rate (2560 cpL vs. 1920 cpL) naturally prevents aliasing interference while preserving high-frequency signal components, thereby maintaining picture quality without requiring band suppression
Solution Approach 2:
The patent creates multiple copies of the sampling function across subpixels within each pixel. This copying approach distributes the sampling function across multiple locations, achieving oversampling effect that prevents aliasing while preserving signal fidelity and picture quality
3Measurement precision
If subpixel rendering is applied to increase effective resolution, then the Nyquist limit is improved, but pseudo color interference may occur
Solution Approach 1:
The patent applies different processing strategies to different spatial locations and signal characteristics. By detecting image features (edges, textures, colors) and adaptively adjusting the mixing ratio between subpixel-rendered signal and original signal, the system improves the Nyquist limit where beneficial while suppressing pseudo color interference where it may occur
Solution Approach 2:
The patent dynamically adjusts the mixing ratio between subpixel-rendered signal and original signal based on detected image features. This dynamic adaptation allows the system to maximize the Nyquist limit improvement in suitable regions while minimizing pseudo color interference in regions where subpixel rendering may cause artifacts
Data Source
AI summary
A high-definition luminance signal Y1 is converted into a luminance signal Y2 of a rate (subpixel sampling rate) corresponding to the number of subpixels in the horizontal direction on a display by a subpixel number-of-pixel converter. The luminance signal Y1 is converted into a luminance signal Y3 of a sampling rate of the display by a number-of-pixels-in-pixel-units converter. The luminance signal Y2 and the luminance signal Y3 are mixed by a mixer, and a luminance signal having a frequency characteristic located between a frequency characteristic of the luminance signal Y2 and a frequency characteristic of the luminance signal Y3 is output. A mixing rate of the mixer is controlled according to a control value that is generated by an image feature detecting portion.