Zero Bezel Display Panel Isolation Structure for Water Penetration

Solution Overview

Problem

Light emitting display apparatuses face reliability issues due to water penetration and bezel width, which affects the integrity of the display panel and causes image discontinuity in multi-screen setups.

Innovation Solution

A light emitting display apparatus with a zero bezel width design, featuring a common electrode connection portion electrically coupling the pixel common voltage line to the common electrode, and an inner isolation portion surrounding the connection to prevent water penetration, ensuring the reliability of the display panel and seamless image integration in multi-screen configurations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a bezel area is provided to surround the display area, then the reliability of the display panel is improved by preventing water penetration, but the bezel width increases reducing the display area

Engineering Contradiction:

Improvedisplay panel reliabilityVSAvoiddisplay area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The isolation structure is divided into a first isolation portion and a second isolation portion that are spatially separated and independently positioned around the organic encapsulation layer, rather than using a single continuous bezel structure. This segmentation allows the isolation function to be distributed without requiring a complete peripheral bezel.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The isolation portions extend in the thickness direction of the display panel, creating a three-dimensional isolation barrier around the organic encapsulation layer. This vertical dimension provides effective water penetration prevention without requiring horizontal bezel width.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Area of stationary object

If the bezel width is reduced to minimize the non-display area, then the display area is increased, but water may penetrate through the connection portion between common electrode and pixel common voltage line

Engineering Contradiction:

Improvedisplay areaVSAvoidwater penetration

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The isolation structure is divided into a first isolation portion and a second isolation portion that are spatially separated and independently positioned around the organic encapsulation layer, rather than using a single continuous bezel structure. This segmentation allows the isolation function to be distributed without requiring a complete peripheral bezel.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first and second isolation portions are specifically positioned at locations where water penetration risk is highest (around the connection portion between common electrode and pixel common voltage line), providing targeted protection rather than uniform bezel coverage throughout the periphery.

Inventive Principle:

Principle #3Local quality

3Reliability

If a bezel is provided to prevent water penetration, then the reliability is improved, but a boundary portion or seam is formed between adjacent display apparatuses in multi-screen configurations

Engineering Contradiction:

Improvedisplay panel reliabilityVSAvoidimage continuity

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The isolation structure is divided into a first isolation portion and a second isolation portion that are spatially separated and independently positioned around the organic encapsulation layer, rather than using a single continuous bezel structure. This segmentation allows the isolation function to be distributed without requiring a complete peripheral bezel.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The harmful bezel structure that caused visible seams and image discontinuity is completely removed from the display periphery. Only the essential isolation portions are retained at critical locations, extracting the water prevention function from the cosmetic-harmful bezel structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12262612B2Light emitting display apparatus and multi-screen display apparatus including the same

Publication Date: 2025.03.25 LG DISPLAY CO LTD

AI summary

A light emitting display apparatus includes a plurality of pixels arranged along a first direction and a second direction different from the first direction over a first substrate, a circuit layer including a pixel common voltage line in parallel with the second direction and disposed between the plurality of pixels along the first direction, a light emitting device layer including a self-emitting device disposed over the circuit layer and a common electrode disposed over the self-emitting device, a common electrode connection portion electrically coupling the pixel common voltage line to the common electrode, and an inner isolation portion surrounding the common electrode connection portion and isolating the self-emitting device disposed over the inner isolation portion.