View Angle Compensation for LCDs via Region Detection

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Solution Overview

Problem

Existing View Angle Compensation (VAC) algorithms for large-sized LCDs suffer from poor accuracy in detecting high-frequency regions, leading to ineffective view angle compensation and issues like color shift and aliasing.

Innovation Solution

A method for view angle compensation that involves obtaining initial pixel data, performing region detection to identify target pixel regions, pre-processing the data to correct grayscale shifts, and then applying view angle compensation specifically to low-frequency regions, while avoiding high-frequency regions to prevent color shift and aliasing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If pre-processing is performed on pixel data before region detection, then grayscale shifts are corrected, but original features are lost leading to poor high-frequency region detection accuracy

Engineering Contradiction:

Improveregion detection accuracyVSAvoidoriginal feature loss

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent applies pre-processing (grayscale and chroma shift correction) before view angle compensation but performs region detection on the initial pixel data before pre-processing. This preliminary region detection on original data preserves detection accuracy while still allowing subsequent pre-processing to correct display issues.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If view angle compensation is applied to high-frequency regions, then compensation coverage is increased, but color shift and aliasing occur

Engineering Contradiction:

Improvecompensation coverageVSAvoidcolor shift and aliasing

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent identifies high-frequency regions through region detection and excludes them from view angle compensation, applying compensation only to low-frequency regions. This local differentiation prevents color shift and aliasing in critical areas while maintaining compensation benefits in other regions.

Inventive Principle:

Principle #3Local quality

3Reliability

If region detection is performed on pre-processed pixel data, then grayscale shifts are corrected first, but detection accuracy deteriorates

Engineering Contradiction:

Improvecompensation effectivenessVSAvoidhigh-frequency region detection accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent performs region detection on initial pixel data before pre-processing to ensure accurate high-frequency region identification. The detected regions then guide the subsequent pre-processing and view angle compensation steps, ensuring reliable compensation effectiveness without sacrificing detection accuracy.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12340772B2View angle compensation

Publication Date: 2025.06.24 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

A method for view angle compensation, includes: obtaining initial pixel data of a to-be-displayed image; performing a region detection on the initial pixel data to obtain a target pixel region in which a target pixel corresponding to target pixel data in the initial pixel data is located; pre-processing the initial pixel data to obtain intermediate pixel data; determining to-be-compensated pixel data in the intermediate pixel data based on the target pixel region; and performing a view angle compensation on the to-be-compensated pixel data in the intermediate pixel data to obtain display pixel data.