Backlight Module Spring Element LED Positioning

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Solution Overview

Problem

Conventional liquid crystal display (LCD) backlight modules suffer from manufacturing inaccuracies that result in gaps between LEDs and the light guide plate, leading to reduced luminance and uneven light emission.

Innovation Solution

A backlight module design featuring a frame with spring elements, including a spring finger and connecting arm, which securely positions radiation elements between the spring finger and the light incident surface of the light guide plate, ensuring close contact and minimizing gaps.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional assembly methods are used without spring elements, then the device structure is simple, but gaps exist between LEDs and light guide plate due to manufacturing inaccuracies

Engineering Contradiction:

Improvepositioning accuracy of LEDsVSAvoidstructure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The spring element changes its compression parameter to adapt to manufacturing tolerances. By designing the spring with specific elastic properties, it can compress to accommodate variations in LED and light guide plate dimensions, ensuring consistent contact pressure and eliminating gaps without requiring ultra-precise manufacturing.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The spring element introduces dynamic adjustment capability to the assembly. Instead of a fixed rigid connection, the spring allows the LED position to be dynamically adjusted within the range of its elastic deformation, automatically compensating for manufacturing variations and maintaining optimal contact with the light guide plate.

Inventive Principle:

Principle #15Dynamics

2Illumination intensity

If gaps exist between LEDs and light guide plate, then assembly is easier, but luminance emission is reduced and light distribution is uneven

Engineering Contradiction:

Improveluminance emissionVSAvoidassembly ease

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The spring element provides beforehand cushioning by pre-compressing within its elastic range to ensure consistent contact pressure between the LED and light guide plate. This pre-compression compensates for potential gaps before light emission begins, ensuring optimal luminance transmission and uniform light distribution from the outset.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 enhances the brightness and uniformity of luminance by eliminating gaps between LEDs and the light guide plate, improving light emission efficiency and preventing rearward light emission.

Implementation Method 1

at least one spring element, having a spring finger and a connecting arm connecting the spring finger and one side wall of the frame

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS7800707B2Backlight module and liquid crystal display device using same

Publication Date: 2010.09.21 INNOLUX CORP

AI summary

A backlight module (200) includes a fame (55) having a plurality of side walls (551, 552, 553, 554); a light guide plate (53) received in the frame, having a light incident surface (533); at least one spring element (5523), having a spring finger (5525) and a connecting arm (5524) connecting the spring finger and one side wall of the frame; and at least one radiation element (56) disposed between the spring finger and the light incident surface. The width of the at least one radiation element is larger than a distance between the light incident surface and the spring finger in a free state.