Light-Transmitting Shielding Portion for Display Voltage Stability

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Solution Overview

Problem

Existing display devices face challenges in blocking electrical fields while minimizing luminance reduction, particularly due to the use of metal film storage electrode lines that can obstruct light transmission and lead to reduced pixel electrode luminance.

Innovation Solution

Incorporating a light-transmitting shielding portion made of a conductive film, which is strategically positioned adjacent to both the pixel electrode and the gate line, and is formed by reducing the resistance of a portion of the semiconductor film, allowing it to block electrical fields without overlapping the pixel electrode, thus maintaining light transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a metal film storage electrode line is used to block electrical fields, then electromagnetic interference is blocked and voltage stability is improved, but light transmission is reduced and luminance decreases

Engineering Contradiction:

Improvevoltage stabilityVSAvoidluminance

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent changes the material parameter from metal film to conductive film, which fundamentally alters the light transmission property while maintaining electrical conductivity. This parameter change allows the shielding portion to block electrical fields without blocking light, resolving the contradiction between voltage stability and luminance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material structures where the conductive film is integrated with the semiconductor layer. This composite approach enables the shielding portion to exhibit both electrical conductivity (for field blocking) and optical transparency (for light transmission), simultaneously achieving voltage stability and high luminance.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If a storage electrode line is positioned to overlap the pixel electrode for forming a storage capacitor, then voltage storing capacity is enhanced, but the same overlapping structure reduces light transmission and causes luminance reduction

Engineering Contradiction:

Improvevoltage storing capacityVSAvoidlight transmission

Core Design Contradiction:

Quantity of substanceVSIllumination intensity

Solution Approach 1:

The patent changes the material composition parameter from metal-based to conductive film-based, transforming the optical property from light-blocking to light-transmitting while preserving the electrical function of voltage storage. This resolves the contradiction between enhancing voltage storing capacity and maintaining light transmission.

Inventive Principle:

Principle #35Parameter changes

3Illumination intensity

If a light-transmitting shielding portion is used instead of metal film, then light transmission is maintained, but the shielding effectiveness against electrical fields may be reduced

Engineering Contradiction:

Improvelight transmissionVSAvoidelectrical field blocking

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent creates a composite structure where the conductive film is formed within or integrated with the semiconductor layer. This composite configuration provides sufficient electrical conductivity to block electrical fields while the inherent transparency of the semiconductor material ensures light transmission is not compromised.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The conductive film acts as an intermediary between the metal electrode and the light transmission path. It provides the necessary electrical shielding function while being optically transparent, mediating between the conflicting requirements of field blocking and light transmission.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

This solution effectively blocks electrical fields and suppresses parasitic capacitance, preventing luminance reduction while ensuring high light transmission, thereby enhancing display quality.

Implementation Method 1

the light-transmitting shielding portion is made of a conductive film having light-transmitting and disposed adjacent to both the pixel electrode and the pixel line... blocks an electrical field

Methodology Applied

Scientific EffectElectrical field blocking: Electric Field

Implementation Method 2

conductive film having light-transmitting... ensuring high light transmission

Methodology Applied

Scientific EffectLight transmission: Light

Implementation Method 3

the light-transmitting shielding portion is formed by reducing a resistance of a portion of the semiconductor film

Methodology Applied

Scientific EffectElectrical resistance reduction: Electrical Resistance

Data Source

PatentUS11169424B2Display device

Publication Date: 2021.11.09 SHARP KK

AI summary

A display device includes a pixel electrode, a switching element connected to the pixel electrode, a pixel line connected to the switching element and disposed adjacent to the pixel electrode, and a light-transmitting shielding portion made of a conductive film having light-transmitting and disposed adjacent to both the pixel electrode and the pixel line.