Auxiliary Electrode Placement for Light Leakage Reduction

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Solution Overview

Problem

Conventional liquid crystal displays face issues of insufficient color gamut and low contrast ratio, and overlapped screen display technology can suffer from uneven brightness (mura) at the gaps between light adjustment zones, leading to light leaks or dark areas.

Innovation Solution

A light adjustment panel is designed with a common electrode layer, a control electrode layer, and a light adjustment liquid crystal layer in stack, along with auxiliary electrodes. The control electrode layer has control electrodes arranged in an array with gaps between them, and the auxiliary electrodes are positioned to overlap with the orthographic projection of these gaps on the common electrode layer, improving the electric field control and reducing light leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If overlapped screen display technology is used to improve contrast ratio, then contrast ratio increases from 1000:1 to 1000000:1, but uneven brightness (mura) appears at the gap between zones of the light adjustment panel

Engineering Contradiction:

Improvecontrast ratioVSAvoidbrightness uniformity

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

A black matrix is introduced as an intermediary element to fill the gaps between adjacent light adjustment zones. This black matrix acts as a mediator that absorbs stray light and prevents light leakage from neighboring zones, thereby eliminating the mura effect while preserving the high contrast ratio achieved by the overlapped screen display technology.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The black matrix is selectively applied only at the gap regions between light adjustment zones, where it is most needed to prevent light leakage. The rest of the light adjustment zones maintain their original optical properties for optimal light control. This localized application ensures brightness uniformity without compromising the overall light adjustment capability.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If the light adjustment panel includes multiple light adjustment zones with gaps between them, then local backlight adjustment is achieved, but light leaks or dark areas appear at the gaps

Engineering Contradiction:

Improvelocal backlight adjustmentVSAvoidlight leakage

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The black matrix serves as an intermediary structure positioned at the gaps between light adjustment zones. It absorbs stray light that would otherwise leak into adjacent zones, ensuring that each zone maintains its independent light control capability without interference from neighboring zones, thus preserving local backlight adjustment functionality while eliminating light leakage.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If conventional liquid crystal display is used, then结构简单 (structure is simple), but color gamut is insufficient and contrast ratio is low

Engineering Contradiction:

Improvestructure simplicityVSAvoidcolor gamut and contrast ratio

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The display system is segmented into two independent panels: a display panel for color and pattern control, and a light adjustment panel for local backlight control. This segmentation allows each panel to be optimized for its specific function, resulting in enhanced color gamut and contrast ratio while maintaining reasonable structural complexity through modular design.

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution effectively reduces light leakage and dark areas, enhancing the display's contrast ratio and overall image quality, while also improving the transmittance of the light adjustment panel.

Implementation Method 1

The light adjustment panel includes a common electrode layer, a control electrode layer and a light adjustment liquid crystal layer arranged in stack

Methodology Applied

Scientific EffectLiquid crystal electric field control: Electric Field

Implementation Method 2

the light adjustment liquid crystal layer comprises a first light adjustment liquid crystal and a second light adjustment liquid crystal

Methodology Applied

Scientific EffectLiquid crystal optical modulation: Liquid Crystals

Implementation Method 3

auxiliary electrodes, wherein the control electrode layer comprises control electrodes arranged in an array, and a gap is provided between adjacent ones of the control electrodes

Methodology Applied

Scientific EffectElectric field generation: Electric Field

Data Source

PatentUS12222608B2Light adjustment panel, overlapped screen panel, and method of manufacturing light adjustment panel

Publication Date: 2025.02.11 HEFEI BOE OPTOELECTRONIC TECH CO LTD

AI summary

There is provided are a light adjustment panel, an overlapped screen panel, and a method of manufacturing a light adjustment panel. The light adjustment panel includes a common electrode layer, a control electrode layer, a light adjustment liquid crystal layer, arranged in stack, and auxiliary electrodes. The control electrode layer includes control electrodes arranged in an array, and there is a gap between adjacent control electrodes. The orthographic projection of the gap on the common electrode layer at least partially overlaps with the orthographic projections of the auxiliary electrodes on the common electrode layer.