Signal Processing Device for Uniform OSD Display
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Solution Overview
Problem
Current signal processing devices struggle to uniformly display On-Screen Display (OSD) areas across varying ambient luminance and enhance image quality by performing multi-stage noise reduction, grayscale extension, and resolution enhancement, especially for high-definition images with 4K resolution and 120 Hz vertical synchronization.
Innovation Solution
A signal processing device with a first reduction unit for noise reduction and a second reduction unit for grayscale amplification, along with an HDR processor for grayscale conversion, performs multi-stage image quality processing, including noise reduction and resolution enhancement, to ensure uniform OSD display and improved image quality regardless of ambient luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If grayscale amplification is performed on the entire image signal including OSD areas, then image quality is enhanced, but OSD display uniformity deteriorates due to ambient luminance variations
Solution Approach 1:
The image signal is segmented into OSD areas and non-OSD areas. The grayscale amplification processing is applied selectively: non-OSD areas receive full grayscale amplification to enhance image quality, while OSD areas receive reduced or no grayscale amplification to maintain display uniformity across varying ambient luminance conditions. This spatial segmentation resolves the contradiction by applying different processing strengths to different regions.
Solution Approach 2:
Different grayscale amplification characteristics are applied to different regions of the image. Non-OSD regions undergo strong grayscale amplification for enhanced image quality, while OSD regions undergo weak or no grayscale amplification to preserve uniform display. This local differentiation of processing quality allows simultaneous optimization of both image quality and OSD uniformity.
2Manufacturing precision
If multi-stage noise reduction is performed, then image quality is enhanced, but processing complexity increases
Solution Approach 1:
The noise reduction process is divided into multiple stages with different processing strengths. First-stage noise reduction applies strong noise reduction to effectively remove noise, while second-stage noise reduction applies weak noise reduction to preserve image details and avoid over-smoothing. This multi-stage segmentation achieves superior noise reduction performance while managing processing complexity through hierarchical processing.
3Object-affected harmful factors
If strong noise reduction is applied, then noise is effectively removed, but image details are lost
Solution Approach 1:
Noise reduction is segmented into multiple stages with decreasing intensity. The first stage applies strong noise reduction to remove prominent noise, while subsequent stages apply progressively weaker noise reduction to preserve fine image details. This staged approach prevents the loss of important image information while effectively reducing noise.
Solution Approach 2:
The noise reduction process employs periodic application of different强度的 processing. Strong noise reduction is applied in the first stage, followed by weaker noise reduction in subsequent stages. This periodic variation in processing intensity allows effective noise removal while preserving image details that would be lost in single-stage strong reduction.
Data Source
AI summary
Disclosed is a signal processing device and an image display apparatus including the same. The signal processing device and the image display apparatus comprise: a first reduction unit to receive a image signal and reduce noise of the received image signal, and a second reduction unit to perform grayscale amplification based on the image signal from the first reduction unit, wherein the second reduction unit is configured to perform the grayscale amplification so that upper-limit level of grayscale of the image signal from the first reduction unit is greater than upper-limit level of grayscale of an OSD signal. Accordingly, OSD area may be uniformly displayed regardless of ambient luminance.