Display Panel Halo Testing Using Multi-Point Brightness Evaluation

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Solution Overview

Problem

Existing methods for evaluating the halo phenomenon in display panels do not consider the impact of backlight section zones, leading to inaccuracies in assessing the halo effect and overall display quality.

Innovation Solution

A testing method that involves displaying a test picture with specific positional alignment, obtaining brightness values at defined points, and calculating a halo value based on these values to account for different sizes of backlight section zones, using an optical testing instrument and a main controller to implement this method.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If local dimming control is implemented to reduce power consumption and increase contrast, then energy efficiency and image quality are improved, but a halo problem appears in black regions around bright objects

Engineering Contradiction:

Improvepower consumptionVSAvoidhalo problem

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The backlight is divided into multiple independent control zones (first backlight control zone and second backlight control zone) with different brightness levels. This segmentation allows different regions to be controlled independently, reducing the halo effect by creating a gradient transition rather than a sharp boundary between bright and dark areas.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display are assigned different quality characteristics - the first backlight control zone has higher brightness while the second has lower brightness. This local differentiation optimizes the balance between contrast and halo reduction by tailoring the backlight properties to specific viewing requirements.

Inventive Principle:

Principle #3Local quality

2Device complexity

If traditional halo evaluation methods are used, then the evaluation process is simple, but the assessment accuracy is insufficient due to not considering backlight section zones

Engineering Contradiction:

Improveevaluation processVSAvoidhalo evaluation accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The evaluation process is segmented into multiple measurement points (first measurement point in the bright object region, second measurement point in the black region, third measurement point at the boundary). This segmentation enables accurate capture of the halo effect by measuring at critical locations where the transition occurs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The evaluation method adds spatial dimensionality by considering multiple measurement points across different zones rather than a single point measurement. This multi-dimensional approach captures the gradient nature of the halo effect and provides more comprehensive assessment accuracy.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12540846B2Testing method and testing system for halo of display panel

Publication Date: 2026.02.03 HKC CORP LTD

AI summary

A testing method halo of a display panel and a testing system for halo of a display panel are provided by the present disclosure. The testing method halo of the display panel includes: obtaining a brightness value of a first position point located in a region where the test picture is located; obtaining a brightness value of a second position point located on a loop line surrounding the test picture; obtaining a brightness value of a third position point located in a corner region of the display panel; and obtaining a halo value based on the brightness value of the first position point, the brightness value of the second position point, and the brightness value of the third position point.