Display Module Light Cutoff Part for Leakage Prevention

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Solution Overview

Problem

Liquid crystal display modules experience light leakage due to abnormal light paths caused by the mold, leading to image distortion, brightness differences, and screen stains, which existing technologies fail to adequately address.

Innovation Solution

A mobile terminal display module design incorporating a light cutoff part with a dark-colored ink layer or reflective surface on the mold's inner lateral side to absorb or redirect abnormal light paths, preventing leakage and maintaining image clarity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional mold structure is used without light cutoff parts, then the device complexity is low, but light leakage occurs causing image distortion and brightness differences

Engineering Contradiction:

Improveimage qualityVSAvoidmold structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The mold is segmented into functional zones: a light cutoff part with dark-colored ink layer positioned at specific locations on the mold inner lateral side, separating the light-blocking function from the general mold structure. This targeted segmentation addresses light leakage without requiring complete redesign of the entire mold.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A dark-colored ink layer is introduced as an intermediary substance on the light cutoff part of the mold. This ink layer acts as a mediator that absorbs abnormal light paths, preventing direct light leakage while maintaining the structural integrity of the original mold design.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a reflective film is added to prevent light leakage, then image quality improves, but the thickness of the backlight unit increases

Engineering Contradiction:

Improvelight leakage preventionVSAvoidbacklight unit thickness

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

Instead of adding a reflective film that reflects light back (conventional approach), the invention uses a dark-colored ink layer on the mold that absorbs abnormal light paths. This inverted approach achieves light leakage prevention through absorption rather than reflection, eliminating the need for additional reflective film layers and reducing overall thickness.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The light leakage prevention function is extracted from the backlight unit structure and relocated to the mold structure. By positioning the light cutoff part with dark-colored ink on the mold inner lateral side, the function is separated from the backlight unit, allowing the backlight unit to maintain its original thin profile without requiring additional reflective films.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If the mold structure is modified to include light cutoff parts, then light leakage is minimized, but manufacturing complexity increases

Engineering Contradiction:

Improvelight leakage controlVSAvoidmold manufacturing

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The mold is manufactured with local quality variations: specific regions (inner lateral side) are treated with dark-colored ink layers to create light cutoff parts, while other regions maintain the original mold properties. This localized treatment approach simplifies manufacturing compared to complete mold redesign, as only specific areas require modification.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The manufacturing process incorporates parameter changes by applying dark-colored ink layers to specific mold regions. This changes the optical parameters (light absorption) of localized areas without fundamentally altering the mold's structural parameters, making the manufacturing process adaptable and relatively simple.

Inventive Principle:

Principle #35Parameter changes

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 light leakage, resulting in clearer and more vivid images by absorbing or redirecting light that would otherwise cause distortion, while also reducing the thickness of the backlight unit by eliminating the need for a reflective film.

Implementation Method 1

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentEP2640040B1Display module and mobile terminal having the same

Publication Date: 2018.10.24 LG ELECTRONICS INC

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AI summary

Display module and mobile terminal having the same are provided. The display module includes a liquid crystal display panel configured to output a color per pixel, a backlight unit configured to uniformly project light to a rear side of liquid crystal display panel, a backlight unit having a light guide plate and a light source, a mold located at a perimeter of the liquid crystal display panel and a perimeter of the backlight unit, and a light cutoff part configured to cut off path of light incident on a front of the liquid crystal display panel from a side of the liquid crystal display panel. Accordingly, light leakage caused by light incident on lateral side of liquid crystal display panel by being reflected by mold or light reflected by lateral side of liquid crystal display panel is minimized to output more clear and vivid images.