Display Panel Driving Method for VA Color Shift Mitigation

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Solution Overview

Problem

Large-size VA liquid crystal display panels suffer from significant color shift issues under large viewing angles due to optical defects, particularly in VA-type liquid crystal driven displays, which affect the purity and brightness of colors.

Innovation Solution

A driving method and system for display panels that involves converting RGB color signals into HSV spatial signals, increasing saturation, and adjusting brightness normalization to reduce color mixing, thereby improving color saturation and mitigating color shift without sacrificing aperture ratio or light transmittance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If VA liquid crystal technology is used for large-size display panels, then production efficiency and manufacturing cost are improved, but color shift occurs under large viewing angles

Engineering Contradiction:

Improveproduction efficiencyVSAvoidcolor shift

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent transforms color signals from the RGB color space to the HSV (Hue, Saturation, Value) color space, and dynamically adjusts the saturation parameter based on viewing angle. By changing the color representation parameters and selectively modifying the saturation component, the patent compensates for viewing angle-dependent color shifts while preserving the benefits of VA liquid crystal technology

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If saturation value is increased to improve color purity, then color shift is reduced, but color mixing may increase

Engineering Contradiction:

Improvecolor purityVSAvoidcolor mixing

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent applies different processing strategies to different components of the color signal. Specifically, it selectively increases saturation for hues that benefit from enhanced purity while applying different adjustments to the value component to control overall brightness and prevent excessive color mixing. This localized adjustment approach optimizes color purity without uniformly increasing color mixing across all hues

Inventive Principle:

Principle #3Local quality

3Illumination intensity

If aperture ratio is increased to improve light transmittance, then brightness is improved, but color saturation may decrease

Engineering Contradiction:

Improvelight transmittanceVSAvoidcolor saturation

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The patent replaces physical structural modifications (such as changing aperture ratio or panel design) with a signal processing approach. By using HSV color space transformation and saturation adjustment algorithms, the patent achieves color saturation enhancement through software-based color management rather than hardware modifications, thereby maintaining both light transmittance and color saturation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS11423854B2Driving method and system of display panel, and display device

Publication Date: 2022.08.23 CHONGQING HKC OPTOELECTRONICS TECH CO LTD

AI summary

The present application discloses a driving method and driving system of a display panel, and a display device. The driving method includes: converting the first color signal to obtain a first HSV (hue, saturation, value) spatial signal; obtaining a second HSV spatial signal; reducing the minimum value of the first brightness normalized signals according to the second HSV spatial signal to obtain second brightness normalized signals; converting the second brightness normalized signals to obtain a second color signal; and driving the display panel using the second color signal.