Backlight Module Light Guide Plate Columnar Microstructures

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Solution Overview

Problem

The non-uniform adsorption between the light guide plate and the optical film layer in backlight modules leads to luminance non-uniformity, affecting the optical performance of liquid crystal display devices.

Innovation Solution

The backlight module incorporates a light guide plate with first columnar microstructures and columnar microstructure groups on its light-emitting surface, where the second columnar microstructures are 1-15 times the number of first columnar microstructures, and the first microstructures have a larger width and height than the second microstructures, reducing adsorption and enhancing optical performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a flat light guide plate surface is used, then the manufacturing process is simple, but non-uniform adsorption with the optical film layer occurs causing luminance non-uniformity

Engineering Contradiction:

Improvelight guide plate manufacturing simplicityVSAvoidluminance uniformity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The light guide plate surface is designed with different local structures: first columnar microstructures in certain regions and second columnar microstructures in other regions. These different local structures create varying adsorption characteristics that collectively achieve uniform luminance across the entire display area, resolving the contradiction between manufacturing simplicity and luminance uniformity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The light guide plate surface is segmented into multiple types of columnar microstructures (first and second columnar microstructures with different dimensions and distributions). This segmentation allows different regions to perform specialized functions in light emission and adsorption, thereby achieving overall luminance uniformity while maintaining a relatively simple manufacturing process.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If uniform columnar microstructures are used on the light guide plate, then the structure is simple to manufacture, but luminance uniformity cannot be improved

Engineering Contradiction:

Improvemicrostructure fabrication simplicityVSAvoidluminance uniformity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

Different regions of the light guide plate are equipped with different columnar microstructure configurations. The first columnar microstructures have different dimensions, materials, or distributions compared to the second columnar microstructures, allowing each region to be optimized for its specific function while maintaining manufacturability.

Inventive Principle:

Principle #3Local quality

3Device complexity

If the light guide plate and optical film layer are in direct contact, then the assembly is simple, but non-uniform adsorption causes optical performance degradation

Engineering Contradiction:

Improveassembly structure simplicityVSAvoidoptical performance stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The columnar microstructures create localized variations in the interface between the light guide plate and optical film layer. These localized structures control the adsorption characteristics in different regions, ensuring uniform optical performance while maintaining a relatively simple direct-contact assembly structure.

Inventive Principle:

Principle #3Local quality

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 design eliminates adsorption between the light guide plate and the optical film layer, resulting in improved luminance uniformity and optical performance by adjusting light-emitting luminance and angle.

Implementation Method 1

the light guide plate includes a plurality of first columnar microstructures extending along a second direction perpendicular to the first direction and disposed on the light-emitting surface and a plurality of columnar microstructure groups disposed between the first columnar microstructures and on the light-emitting surface

Methodology Applied

Scientific EffectLight scattering: Scattering

Data Source

PatentUS11415736B2Backlight module with light guide plate with columnar microstructure groups

Publication Date: 2022.08.16 DARWIN PRECISIONS CORP

AI summary

The present disclosure provides a backlight module including a light guide plate including a light-emitting surface, a bottom surface opposite to the light-emitting surface, and a light-incident side connecting the light-emitting surface and the bottom surface and light-emitting elements disposed at the light-incident side along a first direction. The light guide plate includes first columnar microstructures extending along a second direction perpendicular to the first direction on the light-emitting surface and columnar microstructure groups with second columnar microstructures, which are 1-15 times the number of the adjacent first columnar microstructures, between the first columnar microstructures extending along the second direction on the light-emitting surface. A first width of the first columnar microstructures is larger than or equal to a second width of the columnar microstructure groups along the first direction. A first height of the first columnar microstructures is larger than a second height of the columnar microstructure groups.