Backlight Module Positioning Body for Thermal Expansion Gaps

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Solution Overview

Problem

The assembly procedures for backlight modules vary across manufacturers, leading to inconsistent thermal expansion spaces for optical films, which can result in poor optical quality and potential damage to components due to inadequate gaps between the light guide plate and lamp tubes.

Innovation Solution

A backlight module design incorporating a positioning body with flanges within the lamp tube set to create specific gaps for thermal expansion, preventing damage and maintaining optical film integrity by ensuring sufficient thermal expansion spaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the light guide plate is inserted deeply into the lamp tube set, then the assembly structure is compact, but the thermal expansion space for the optical film is insufficient causing poor optical quality

Engineering Contradiction:

Improveassembly compactnessVSAvoidoptical film thermal expansion space

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

A positioning body is introduced as an intermediary component between the light guide plate and the lamp tube set. This positioning body includes a positioning groove that receives the light guide plate and a positioning protrusion that contacts the lamp tube set, thereby mediating the spatial relationship and ensuring adequate thermal expansion space while maintaining compact assembly.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The positioning body changes the positional parameters by providing a predetermined distance through its structured design (positioning groove and positioning protrusion). This parameter change ensures the light guide plate is positioned at the correct depth, providing sufficient thermal expansion space for the optical film while maintaining compact overall dimensions.

Inventive Principle:

Principle #35Parameter changes

2Volume of moving object

If the light guide plate is inserted deeply into the lamp tube set, then the assembly structure is compact, but the light guide plate may be hit by lamp tubes during impact causing broken

Engineering Contradiction:

Improveassembly compactnessVSAvoidlamp tube impact resistance

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The positioning body acts as a protective intermediary by positioning the light guide plate at an appropriate depth within the lamp tube set. The positioning groove and positioning protrusion ensure the light guide plate does not extend too far forward, preventing direct contact and impact with the lamp tubes during external impacts.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The positioning body provides beforehand cushioning by pre-establishing a safe positional relationship between the light guide plate and lamp tubes. The structured positioning features (groove and protrusion) create a buffer zone that prevents direct impact before any harmful contact can occur during impact experiments or normal operation.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Ease of manufacture

If different assembly procedures are used by different manufacturers, then manufacturing flexibility is improved, but inconsistent thermal expansion spaces are generated affecting optical quality

Engineering Contradiction:

Improveassembly procedure flexibilityVSAvoidthermal expansion space consistency

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The positioning body serves as a universal component that can be applied across different manufacturers' assembly procedures. Its standardized structure (positioning groove and positioning protrusion) provides a consistent reference for positioning the light guide plate, ensuring uniform thermal expansion spaces regardless of the specific assembly method used by different manufacturers.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The positioning body standardizes the positional parameters by providing a predetermined distance through its geometric features. This parameter standardization ensures that regardless of variations in assembly procedures or techniques used by different manufacturers, the thermal expansion space for the optical film remains consistent and adequate.

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 solution effectively maintains the optical quality and prevents damage to components by establishing precise gaps between the light guide plate and lamp tubes, accommodating varying assembly procedures and thermal expansion needs.

Implementation Method 1

a predetermined gap D1 is prepared for thermal expansion spaces generated by the optical film 11

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS7712947B2Backlight module

Publication Date: 2010.05.11 AU OPTRONICS CORP

AI summary

A backlight module for use in a planar display panel is disclosed. The backlight module comprises a lamp tube set, a light guide plate and a positioning body. The lamp tube set comprises a lamp housing and at least a lamp tube. An optical film is disposed on the light guide plate. The light guide plate has a side for insetting the light guide plate into the lamp tube set. Furthermore, the positioning body is disposed on an inner wall of the lamp housing and comprises at least a flange against the side. The light guide plate is positioned to contact the positioning body so as to form gaps between the at least a lamp tube and the light guide plate or between the optical film and the lamp housing.