Backlight Optical Member Leakage Light Control

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Solution Overview

Problem

In liquid crystal displays, reducing the peripheral area to increase the display area leads to increased leakage light, which deteriorates display quality due to the inefficiency of light guidance by light guide plates.

Innovation Solution

A backlight assembly is designed with a light guide plate, a side-mounted light source, a display panel, and an optical member with distinct side portions and protruding features that control light paths, allowing for both easy assembly and effective light management through a combination of mount and insert structures to minimize leakage light.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of moving object

If the peripheral area is reduced to increase the display area, then the display area ratio is improved, but leakage light increases causing deterioration in display quality

Engineering Contradiction:

Improvedisplay areaVSAvoidleakage light

Core Design Contradiction:

Area of moving objectVSObject-affected harmful factors

Solution Approach 1:

The optical member is divided into multiple functional regions: a first region with a first refractive index for guiding light in the display area, and a second region with a second refractive index for blocking leakage light in the peripheral area. This segmentation allows different parts of the optical member to perform different functions, effectively reducing leakage light while maintaining a large display area ratio.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the optical member are assigned different refractive indices to achieve local functional differentiation. The first region has properties optimized for light guidance toward the display panel, while the second region has properties optimized for blocking leakage light. This local quality variation resolves the contradiction by addressing leakage light specifically where it occurs without compromising the display area.

Inventive Principle:

Principle #3Local quality

2Use of energy by moving object

If a light guide plate is used to guide light from light source to display panel, then light guidance efficiency is improved, but leakage light occurs reducing display quality

Engineering Contradiction:

Improvelight guidance efficiencyVSAvoidleakage light

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The optical member acts as an intermediary between the light guide plate and the display panel. It receives light from the light guide plate, guides it effectively to the display panel through its first region, and blocks leakage light through its second region. This intermediary function resolves the contradiction by improving light guidance efficiency while simultaneously preventing leakage light from reaching the display panel.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If the optical member has complex structure to block leakage light, then display quality is improved, but assembly difficulty increases

Engineering Contradiction:

Improveleakage light blockingVSAvoidassembly ease

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The optical member merges multiple functions into a single integrated component: light guidance, leakage light blocking, and structural support. By combining these functions in one piece rather than using separate components, the patent achieves effective leakage light blocking while simplifying assembly procedures. The single-piece construction eliminates the need for complex multi-component assemblies.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The optical member is designed as a multi-functional component that simultaneously guides light to the display panel, blocks leakage light, and provides structural support within the backlight assembly. This universality reduces the total number of components needed, thereby simplifying assembly while maintaining effective leakage light blocking capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 improves display quality by reducing leakage light and facilitates easy assembly of the backlight assembly, enhancing the overall performance and structure of the display apparatus.

Implementation Method 1

liquid crystal displays that utilize a light guide plate to guide light from a light source to a display panel

Methodology Applied

Scientific EffectTotal internal reflection: Total Internal Reflection

Implementation Method 2

an optical member arranged between the light guide plate and the display panel to control a path of the light exiting from the light guide plate

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS8770820B2Backlight assembly and display apparatus having the same

Publication Date: 2014.07.08 SAMSUNG DISPLAY CO LTD

AI summary

A display apparatus includes a light guide plate guiding a light, a light source arranged in a side portion of the light guide plate to generate the light, a display panel receiving the light from the light guide plate to display an image, a frame including a sidewall and a support part extended from the sidewall to support the display panel, and an optical member arranged between the light guide plate and the display panel to control a path of the light exiting from the light guide plate. The optical member includes a first side portion and a second side portion, a side surface of the first side portion faces a side surface of the support part, and the second side portion is positioned between the support part and the light guide plate.