Backlight Unit Light Distribution via Extraction and Parameter Changes

Solution Overview

Problem

Conventional LCD display devices with backlight units face challenges in achieving good luminance and color uniformity due to the limitations of light guiding layers, which increase thickness, weight, and manufacturing costs.

Innovation Solution

A display apparatus is designed without a light guiding layer, featuring a backlight unit with a circuit board layer, a reflection layer, a patterned metal reflection (PMR) layer, and a vacant layer between the reflection and PMR layers, allowing for effective light propagation and distribution without total reflection, thereby enhancing luminance and color uniformity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a light guiding layer is used in the backlight unit, then light can be guided and distributed, but the thickness and weight of the display module increase

Engineering Contradiction:

Improveluminance uniformityVSAvoidthickness

Core Design Contradiction:

Illumination intensityVSLength of moving object

Solution Approach 1:

The patent removes the light guiding layer from the backlight unit structure, extracting this component entirely. Instead, the invention uses a reflective layer with specific reflectivity characteristics to achieve light distribution without requiring a separate light guiding layer, thereby reducing thickness while maintaining luminance uniformity

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the reflectivity parameter of the reflective layer to optimize light distribution. By adjusting the reflectivity characteristics of this layer, the system achieves effective light guidance and distribution functions previously provided by the light guiding layer, but without the thickness penalty

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If a light guiding layer is used in the backlight unit, then light can be guided and distributed, but the weight of the display module increases

Engineering Contradiction:

Improveluminance uniformityVSAvoidweight

Core Design Contradiction:

Illumination intensityVSWeight of stationary object

Solution Approach 1:

The patent removes the light guiding layer from the backlight unit structure, extracting this component entirely. Instead, the invention uses a reflective layer with specific reflectivity characteristics to achieve light distribution without requiring a separate light guiding layer, thereby reducing thickness while maintaining luminance uniformity

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the reflectivity parameter of the reflective layer to optimize light distribution. By adjusting the reflectivity characteristics of this layer, the system achieves effective light guidance and distribution functions previously provided by the light guiding layer, but without the thickness penalty

Inventive Principle:

Principle #35Parameter changes

3Illumination intensity

If a light guiding layer is used in the backlight unit, then light can be guided and distributed, but manufacturing costs increase

Engineering Contradiction:

Improveluminance uniformityVSAvoidmanufacturing cost

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The patent removes the light guiding layer from the backlight unit structure, extracting this component entirely. Instead, the invention uses a reflective layer with specific reflectivity characteristics to achieve light distribution without requiring a separate light guiding layer, thereby reducing thickness while maintaining luminance uniformity

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the light distribution function into the reflective layer itself, combining multiple functions into a single component. The reflective layer simultaneously provides reflection and light distribution functions that were previously separated between the reflective layer and light guiding layer, simplifying the structure and reducing manufacturing complexity

Inventive Principle:

Principle #5Merging (Combining)

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

This configuration improves light distribution uniformity, reduces the thickness and weight of the display module, and lowers manufacturing costs while maintaining high picture quality and competitiveness.

Implementation Method 1

a reflection layer formed on the circuit board layer, for reflecting light emitted from the light source

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS8675151B2Display apparatus

Publication Date: 2014.03.18 LG ELECTRONICS INC

AI summary

A display apparatus is provided and includes a display panel, and a backlight unit supplying light from a rear of the display panel. The backlight unit includes a light source, a circuit board layer, a reflection layer, a pattern layer, and a vacant layer. The circuit board layer has the light source seated thereon. The reflection layer is formed on the circuit board layer to reflect light emitted from the light source. The pattern layer is positioned on a top surface of the light source. The vacant layer is formed between the reflection layer and the pattern layer.