Electro-Optical Device Frame Stress Isolation

Solution Overview

Problem

Luminance unevenness in electro-optical panels, such as liquid crystal panels, is caused by stress transmitted from metal frames due to low flatness of the supporting surfaces, which becomes more pronounced as panel definition and viewing angle increase.

Innovation Solution

An electro-optical device with a casing comprising three frame bodies - a first frame body made by die casting for high stiffness and low distortion, a second frame body protecting the lower surface, and a third frame body protecting the end edges, with a fixing portion that applies a clamping force in a specific direction to prevent distortion and falling-off, and includes an interference portion to prevent stress propagation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If metal frames are fixed together by bolts, then the structure is secured, but stress is transmitted to the electro-optical panel causing luminance unevenness

Engineering Contradiction:

Improvestructural securingVSAvoidluminance unevenness

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The frame is divided into multiple independent frame members that are not rigidly connected. Each frame member can independently support the electro-optical panel without transmitting stress from other parts of the frame structure, thereby preventing luminance unevenness while maintaining structural security.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A cushioning member (elastic body) is introduced between the frame member and the electro-optical panel. This intermediary absorbs and isolates stress, preventing force transmission from the frame to the panel, thus eliminating luminance unevenness while maintaining structural integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the supporting surface has low flatness, then manufacturing is easier, but stress is transmitted to the panel causing luminance unevenness

Engineering Contradiction:

Improvesupporting surface flatnessVSAvoidluminance unevenness

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

A cushioning member (elastic body) is introduced between the frame member and the electro-optical panel. This intermediary absorbs and isolates stress, preventing force transmission from the frame to the panel, thus eliminating luminance unevenness while maintaining structural integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The cushioning member changes the mechanical parameters of the supporting system by providing elastic compliance. This allows the supporting surface to have lower flatness while still preventing stress transmission to the panel, as the elastic body compensates for surface irregularities.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If the electro-optical panel is made high definition with wide viewing angle, then display quality is improved, but luminance unevenness from stress becomes more conspicuous

Engineering Contradiction:

Improvepanel definitionVSAvoidluminance unevenness

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The frame is divided into multiple independent frame members that are not rigidly connected. Each frame member can independently support the electro-optical panel without transmitting stress from other parts of the frame structure, thereby preventing luminance unevenness while maintaining structural security.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A cushioning member (elastic body) is introduced between the frame member and the electro-optical panel. This intermediary absorbs and isolates stress, preventing force transmission from the frame to the panel, thus eliminating luminance unevenness while maintaining structural integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9116374B2Electro-optical device

Publication Date: 2015.08.25 MAGNOLIA WHITE CORP

AI summary

An electro-optical device includes: an electro-optical panel; and a casing supporting and protecting the electro-optical panel, wherein the casing has a first frame body made by die casting supporting the electro-optical panel through a fixing layer, a second frame body protecting a lower surface of the electro-optical panel, a third frame body protecting end edges of the electro-optical panel, and a fixing portion fixing the second frame body and the third frame body to each other by a clamping force working in a first direction, and the fixing portion or the second frame body has an interference portion preventing falling-off of the first frame body in a state where a force is not applied to the first frame body in the first direction.