Light Guide Plate with Convex Units for Backlight Luminance

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Solution Overview

Problem

Conventional side-entry backlight modules for liquid crystal displays suffer from suboptimal luminance due to inefficient light transmission and distribution, leading to non-uniform image quality.

Innovation Solution

A light guide plate with convex light guide units and microstructure units is designed, where microstructures have light taking and adjusting surfaces to enhance light emission at the main exit angle, improving luminance and uniformity of the surface light source.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If conventional side-entry backlight modules are used, then the device can achieve thin profile, but the luminance and uniformity of exit light are insufficient

Engineering Contradiction:

Improveluminance of exit lightVSAvoidstructural complexity of light guide plate

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The light guide plate is segmented into multiple functional regions: light guide units with convex structures for light transmission, microstructure units with light taking surfaces for light extraction, and adjusting surfaces for light direction control. This segmentation allows each region to perform its specific function optimally, improving overall luminance and uniformity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the light guide plate are given different local qualities: the light guide units have convex structures optimized for light transmission, while the microstructure units have specific light taking surfaces optimized for light extraction. This local optimization enhances the overall light guiding performance without requiring complete redesign of the entire structure

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If simple light guide plate structure is used, then manufacturing is easier, but light transmission efficiency and luminance are reduced

Engineering Contradiction:

Improveluminance of exit lightVSAvoidmanufacturing complexity of light guide plate

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The light guide plate structure is designed with pre-formed convex light guide units and microstructure units that are created during the molding process. This preliminary formation of functional structures allows the plate to achieve high light transmission efficiency without requiring additional complex manufacturing steps afterward

Inventive Principle:

Principle #10Preliminary action

3Illumination intensity

If light guide plate with enhanced light extraction is used, then luminance improves, but light transmission efficiency may be compromised

Engineering Contradiction:

Improveluminance of exit lightVSAvoidlight transmission efficiency

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The convex structures of the light guide units and the specific geometries of the microstructure units are optimized with precise dimensional parameters. By carefully controlling parameters such as convex height, microstructure spacing, and surface angles, the design achieves optimal balance between light extraction efficiency and light transmission, maximizing luminance while minimizing energy loss

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 design significantly enhances the luminance and uniformity of the exit light, improving the overall image quality by optimizing light transmission and distribution within the backlight module.

Implementation Method 1

The light guide units are convex to the bottom surface and arranged to be disposed along a direction parallel to the light incident surface

Methodology Applied

Scientific EffectTotal internal reflection: Total Internal Reflection

Implementation Method 2

Each of the microstructures has a light taking surface facing the light incident surface

Methodology Applied

Scientific EffectLight extraction and refraction: Refraction

Data Source

PatentUS10571622B2Light guide plate and backlight module

Publication Date: 2020.02.25 CORETRONIC CORPORATION

AI summary

A light guide plate is provided in the invention. The light guide plate has a light incident surface, a bottom surface and a light exit surface. The bottom surface is opposite to the light exit surface. The light incident surface is connected between the bottom surface and the light exit surface. The light guide plate includes a plurality of light guide units and a plurality of microstructure units. The plurality of light guide units are convex to the bottom surface and arranged to be disposed along a direction parallel to the light incident surface. The plurality of light guide units is connected to each other on the light incident surface. The plurality of microstructure units are disposed corresponding to the plurality of light guide units respectively. Each of the microstructure units includes a plurality of microstructures. The invention further provides a backlight module having this light guide plate.