LCD Module Rear Substrate Ledge Fixation

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Solution Overview

Problem

Conventional LCD module fixation methods in carrier products result in increased bulkiness and aesthetic issues due to the need for additional fixings on the outer face of the front substrate, which prevents the LCD from lying flush with the carrier product's surface, thereby negating the depth advantages of using LCDs.

Innovation Solution

The rear substrate of the LCD module extends beyond the perimeter of the front substrate to create a ledge with mounting points for fixings, allowing secure attachment to the module frame without the need for external fixings on the front substrate, ensuring the LCD lies flush with the carrier product's surface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If fixings are made to the outer face of the front substrate, then the LCD module is securely fixed to the carrier product, but the LCD does not lie flush with the external surface and the carrier product requires significant extra depth

Engineering Contradiction:

Improvefixing securityVSAvoidcarrier product depth

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The rear substrate is extended beyond the front substrate perimeter in the depth dimension, creating a ledge that provides fixing surfaces. This dimensional extension allows fixings to be applied to the rear substrate's outer surface rather than the front substrate's outer surface, eliminating the need for extra carrier depth while maintaining secure fixation.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

Instead of extending fixings outward from the front substrate (conventional approach), the invention inverts the approach by extending the rear substrate outward to create a ledge. This inversion allows the fixing surfaces to be positioned on the rear substrate's outer surface, which is flush with the carrier product surface, thereby eliminating the need for additional carrier depth.

Inventive Principle:

Principle #13The other way round (Inversion)

2Ease of manufacture

If double-sided tape is used to secure the LCD module, then the module can be initially fixed, but the adhesion force is insufficient to provide permanent fixing

Engineering Contradiction:

Improveinitial fixationVSAvoidpermanent fixing

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The fixation system is segmented into two stages: initial fixation using double-sided tape and permanent fixation using mechanical fastenings applied to the rear substrate's ledge. This segmentation allows the tape to provide initial positioning while the ledge provides surfaces for permanent mechanical fastenings, achieving both ease of manufacture and reliable permanent fixing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The double-sided tape is applied first as a preliminary action to initially secure the LCD module in position. Once the module is preliminarily fixed, the rear substrate is extended to create a ledge that provides surfaces for permanent mechanical fastenings. This preliminary action enables subsequent permanent fixation without requiring the tape alone to provide both functions.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8189133B2Display module and method for fixing

Publication Date: 2012.05.29 NOKIA TECHNOLOGIES OY

AI summary

A display module (12) adapted to be received in a module frame (27,34), the display module (12) comprising front and rear substrates (13,14). The rear substrate (14) of the display module (12) is extended in its principal plane to provide a ledge (26), which exposes the inner face (17) of the rear substrate (14) such that the display module (12) may be secured in the module frame (27,34) by a fixing between the inner face (17) of the rear substrate (14) and a face of the module frame (27,34).