Display Device Polarizer Expansion Management

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Solution Overview

Problem

In lateral electric field type liquid crystal display devices, the expansion of a polarizer can reduce the contact area between the connecting member and the transparent conductive film, leading to potential connection failures and reliability issues, especially with the demand for narrower frames.

Innovation Solution

A display device design featuring a substrate edge where the connecting member intersects the extending direction of the substrate edge, with an optical element including a penetration portion or notch that absorbs expansion, maintaining contact and preventing connection failures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If the polarizer is disposed close to the connecting member to achieve a narrower frame, then the frame width is reduced, but the contact area between the connecting member and the transparent conductive film is reduced when the polarizer expands

Engineering Contradiction:

Improveframe widthVSAvoidcontact area between connecting member and transparent conductive film

Core Design Contradiction:

Length of stationary objectVSReliability

Solution Approach 1:

The optical element is divided into multiple regions: a first region with the polarizer and a second region with the penetration portion. This segmentation allows the polarizer to be positioned close to the connecting member for narrow framing while the penetration portion absorbs expansion forces, preventing contact area reduction.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The penetration portion acts as an intermediary element between the polarizer and the connecting member. It absorbs the expansion of the polarizer and prevents direct transmission of expansion forces to the connecting member, thereby maintaining reliable electrical connection.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Area of moving object

If the polarizer expands, then the polarizer area increases, but the contact area between the connecting member and the transparent conductive film is reduced

Engineering Contradiction:

Improvepolarizer areaVSAvoidcontact area between connecting member and transparent conductive film

Core Design Contradiction:

Area of moving objectVSReliability

Solution Approach 1:

The expansion of the polarizer, which would normally be harmful by reducing contact area, is converted into a beneficial effect. The penetration portion absorbs this expansion, and the flexible substrate simultaneously provides electrical connection and mechanical compliance, transforming the harmful expansion into an opportunity for the flexible substrate to maintain contact through its elasticity.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the mechanical parameters of the system by introducing a flexible substrate with specific elasticity and a penetration portion with controlled flexibility. These parameter changes allow the system to accommodate polarizer expansion while maintaining reliable electrical connection.

Inventive Principle:

Principle #35Parameter changes

3Length of stationary object

If the frame is made narrower, then the overall device size is reduced, but the polarizer and connecting member are disposed closer, making the connection more sensitive to polarizer expansion

Engineering Contradiction:

Improveframe widthVSAvoidconnection stability

Core Design Contradiction:

Length of stationary objectVSManufacturing precision

Solution Approach 1:

The penetration portion is designed beforehand to absorb the expansion of the polarizer. By providing this cushioning element in advance, the system can accommodate polarizer expansion without compromising the electrical connection, even when the frame is narrowly designed with minimal spacing.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS11740516B2Display device

Publication Date: 2023.08.29 MAGNOLIA WHITE CORP

AI summary

Display device is provided and includes first substrate; second substrate including transparent conductive film; optical element adhered to transparent conductive film; and connecting member, wherein first substrate includes first region which overlaps second substrate and includes display portion, and second region including electrode, second substrate includes substrate edge located at boundary between first and second regions and the second region in first direction, optical element includes optical element edge located between display portion and substrate edge in second direction intersecting first direction, optical element edge does not overlap substrate edge in plan view, transparent conductive film includes extended portion extending from optical element edge toward substrate edge, connecting member is in contact with substrate edge and electrically connects electrode and extended portion, optical element includes notch, and notch and connecting member are arranged in second direction.