Curved Display Shielding Electrode Misalignment Defects

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Solution Overview

Problem

Curved display devices face issues with misalignment between substrates, leading to texture defects and vertical dark portions in pixel areas due to the curvature, which affect display quality and viewing angles.

Innovation Solution

Incorporating a shielding electrode with the same electric potential as the common electrode, which blocks light and eliminates the need for a black matrix, preventing misalignment-induced defects by ensuring no electric field is generated between the shielding and common electrodes, thus improving display quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a curved display device is implemented to provide improved three-dimensional effect and immersiveness, then the viewing experience is enhanced, but misalignment between substrates occurs leading to texture defects and vertical dark portions in pixel areas

Engineering Contradiction:

Improvecurved display effectVSAvoidsubstrate alignment

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

A shielding electrode is introduced as an intermediary element between the pixel electrode and the common electrode. This shielding electrode extends along the data line and is electrically insulated from the pixel electrode, serving as a mediator to block light leakage and prevent the formation of vertical dark portions without requiring precise substrate alignment.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The display panel is segmented into functional regions by introducing the shielding electrode that divides the space between pixel electrodes. This segmentation creates distinct light blocking zones that prevent optical interference between adjacent pixels, thereby eliminating texture defects caused by substrate misalignment in curved displays.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If a black matrix is used to block light in traditional display structures, then light leakage is prevented, but the black matrix may be perceived as vertical dark portions due to misalignment between first and second substrates

Engineering Contradiction:

Improvelight leakageVSAvoidsubstrate alignment

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The shielding electrode serves as an intermediary light-blocking structure替代 the traditional black matrix. By positioning the shielding electrode on the first substrate and extending it along the data line, light leakage is blocked without creating the alignment-sensitive vertical dark portions that occur with black matrix structures in curved displays.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Instead of using a black matrix on the second substrate (traditional approach), the invention inverts the approach by placing the light-blocking shielding electrode on the first substrate. This inversion eliminates the perception of vertical dark portions caused by substrate misalignment while still preventing light leakage effectively.

Inventive Principle:

Principle #13The other way round (Inversion)

3Manufacturing precision

If the width of the shielding electrode is adjusted to prevent texture defects, then display quality is improved, but the structure complexity increases

Engineering Contradiction:

Improvedisplay qualityVSAvoidshielding electrode structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The width of the shielding electrode is optimized as a key parameter to balance display quality and structural simplicity. By adjusting the width parameter within a specific range, the shielding electrode effectively prevents texture defects and vertical dark portions without requiring complex multi-layer structures or additional components.

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 prevents texture defects and vertical dark lines, enhancing display quality and viewing angles by maintaining a uniform light blocking area without the need for a black matrix, even with substrate misalignment.

Implementation Method 1

the shielding electrode blocks the light provided from the backlight assembly through the liquid crystal layer

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Implementation Method 2

the liquid crystal molecules of the liquid crystal layer are vertically aligned with respect to the substrates when an electric field is generated between the two substrates

Methodology Applied

Scientific EffectElectric field alignment: Electric Field

Data Source

PatentUS10295858B2Curved display device

Publication Date: 2019.05.21 SAMSUNG DISPLAY CO LTD

AI summary

A curved display device curved in a first direction includes: a first substrate including a plurality of signal lines, an insulating layer which covers the signal lines, a pixel electrode disposed on the insulating layer, and a shielding electrode electrically insulated from the pixel electrode and disposed along a signal line, which extends substantially in a second direction crossing the first direction, among the signal lines; a second substrate disposed opposite to the first substrate and including a common electrode; and a light control layer interposed between the first substrate and the second substrate.