Liquid Crystal Display Panel Guide Ventilation

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Solution Overview

Problem

Liquid crystal modules experience non-uniform luminance due to deformation caused by large humidity differences between the panel gap and the backlight unit cavity, leading to image quality issues when exposed to rapid temperature and humidity changes.

Innovation Solution

Incorporating ventilation openings in the panel guide and top case to facilitate air and moisture exchange between the panel gap and the outside environment, reducing humidity differences and maintaining a consistent panel gap.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the panel gap is substantially enclosed to protect the liquid crystal display panel, then the structural integrity is improved, but the humidity difference between the panel gap and backlight unit cavity increases causing deformation

Engineering Contradiction:

Improvestructural integrityVSAvoidimage quality

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The enclosure structure is segmented by introducing ventilation openings at specific locations (side walls and top surface) that allow controlled air exchange between the panel gap, backlight unit cavity, and external environment. This segmentation enables the structure to maintain integrity while permitting humidity equalization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Air acts as an intermediary medium that flows through the ventilation openings to equalize humidity between the enclosed panel gap, the backlight unit cavity, and the external environment. This intermediary enables passive humidity regulation without mechanical components.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Temperature

If the backlight unit cavity is designed with outside air ventilation structure, then the heat dissipation is improved, but the humidity difference between the cavity and panel gap increases causing deformation

Engineering Contradiction:

Improveheat dissipationVSAvoidimage quality

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The ventilation systems of the panel gap and backlight unit cavity are merged into a unified air exchange system. Both enclosures communicate with the external environment through coordinated ventilation openings, allowing simultaneous heat dissipation and humidity equalization across both cavities.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The ventilation design creates equipotential humidity conditions across the panel gap and backlight unit cavity by providing multiple air exchange pathways. This eliminates humidity potential differences that would otherwise drive moisture migration and cause deformation.

Inventive Principle:

Principle #12Equipotentiality

3Reliability

If ventilation openings are added to the panel guide and top case, then the humidity difference is reduced, but the device complexity increases

Engineering Contradiction:

Improveimage qualityVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Ventilation openings are added only at specific critical locations (side walls and top surface of the panel guide) rather than uniformly across the entire structure. This localized approach provides effective humidity regulation while minimizing the increase in device complexity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The ventilation openings enable the device to self-regulate humidity through natural convection and diffusion processes. No active control systems, motors, or sensors are required, allowing the structure to service itself in maintaining humidity balance.

Inventive Principle:

Principle #25Self-service

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 minimizes humidity differences within the liquid crystal module, maintaining a constant panel gap and improving the uniformity of light irradiation to the liquid crystal display panel, even under varying environmental conditions.

Implementation Method 1

ventilation openings that penetrate side walls of the panel guide facing the panel gap

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 2

facilitate air and moisture exchange between the panel gap and the outside environment

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS8233108B2Liquid crystal display

Publication Date: 2012.07.31 LG DISPLAY CO LTD

AI summary

A liquid crystal module includes: a liquid crystal display panel; a backlight unit that irradiates light onto the liquid crystal display panel; a panel guide that supports the liquid crystal display panel and the backlight unit in a stacked condition and ensures a panel gap between the liquid crystal display panel and the backlight unit; and a top case facing the panel guide. The panel guide includes one or more ventilation openings that penetrate side walls of the panel guide facing the panel gap.