Scanning Line Shielding for Display Flicker Suppression

Solution Overview

Problem

High-definition display devices face challenges in securing sufficient storage capacitance due to coupling between signal lines and pixel electrodes, leading to undesirable effects such as flicker in the display image, especially at high resolutions and low drive frequencies.

Innovation Solution

A projection of the scanning line is extended between the relay electrode and the signal line, acting as a shield to prevent coupling and maintain stable potential of the pixel electrode, thereby suppressing flicker and enhancing display quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the pixel size is reduced to achieve high-definition display, then the image resolution is improved, but the storage capacitance of the pixel electrode deteriorates

Engineering Contradiction:

Improveimage resolutionVSAvoidstorage capacitance

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

A shielding electrode is introduced as an intermediary element between the signal line and the pixel electrode. This shielding electrode acts as a mediator to block the coupling effect between the signal line and pixel electrode, thereby preventing the loss of storage capacitance while maintaining high-definition display capabilities.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The harmful coupling effect between the signal line and pixel electrode is extracted and isolated by introducing a separate shielding electrode. This allows the problematic interaction to be addressed independently without affecting the overall high-definition display performance.

Inventive Principle:

Principle #2Taking out (Extraction)

2Measurement precision

If the pixel size is reduced to achieve high-definition display, then the image resolution is improved, but the coupling between signal line and pixel electrode worsens

Engineering Contradiction:

Improveimage resolutionVSAvoidcoupling between signal line and pixel electrode

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

A shielding electrode is introduced as an intermediary element between the signal line and the pixel electrode. This shielding electrode acts as a mediator to block the coupling effect between the signal line and pixel electrode, thereby preventing the loss of storage capacitance while maintaining high-definition display capabilities.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Quantity of substance

If the coupling between signal line and pixel electrode increases, then the parasitic capacitance is improved (for signal transmission), but the display image stability deteriorates

Engineering Contradiction:

Improveparasitic capacitanceVSAvoiddisplay image stability

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

A shielding electrode is introduced as an intermediary element between the signal line and the pixel electrode. This shielding electrode acts as a mediator to block the coupling effect between the signal line and pixel electrode, thereby preventing the loss of storage capacitance while maintaining high-definition display capabilities.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The shielding electrode converts the harmful coupling effect into a beneficial shielding effect. By strategically placing the shielding electrode, the previously harmful parasitic capacitance is transformed into a useful shielding mechanism that protects the pixel electrode from unwanted coupling while maintaining display stability.

Inventive Principle:

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

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 reduces parasitic capacitance and maintains excellent display quality even at high resolutions and low drive frequencies, preventing flicker and improving image stability.

Implementation Method 1

A projection of the scanning line is extended between the relay electrode and the signal line, acting as a shield to prevent coupling and maintain stable potential of the pixel electrode

Methodology Applied

Scientific EffectElectrostatic shielding: Faraday Cage

Data Source

PatentUS10197878B2Display device

Publication Date: 2019.02.05 MAGNOLIA WHITE CORP

AI summary

A display device of an embodiment includes scanning lines, signal lines, sub-pixels, a switching element in each of the sub-pixels, a pixel electrode in each of the sub-pixels. The switching element includes a relay electrode in contact with the pixel electrode, and a semiconductor layer in contact with the signal line in a first position, in contact with the relay electrode in a second position, and bending between the first position and the second position and crossing the scanning line. In at least one of the sub-pixels, a part of the scanning line extends between the relay electrode and the signal line which are connected to each other via the semiconductor layer.