Capacitor Electrode Overlapping Gate in Display Pixel Structure

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Solution Overview

Problem

LED display devices face challenges in minimizing diode disconnection and maximizing light emission regions, as existing pixel structures can lead to reduced light emission periods due to potential disconnection issues.

Innovation Solution

The proposed solution involves a specific pixel structure design with a substrate, transistors, insulating layers, and contact members, where the center of the openings in the insulating layers is strategically spaced to prevent disconnection of the emission layer, ensuring the light emitting region is away from the contact member and maintaining electrical connections efficiently.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the pixel structure uses conventional alignment of openings with contact members, then manufacturing is simpler, but the emission layer may disconnect reducing light emission period

Engineering Contradiction:

Improveemission layer connection reliabilityVSAvoidpixel structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies asymmetry by deliberately misaligning the center of the second opening with the center of the first opening. The second opening is positioned such that its center is spaced from the first opening's center, creating an asymmetric structure that prevents emission layer disconnection while maintaining electrical connectivity through the contact member.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent transitions from a one-dimensional aligned structure to a two-dimensional spatial arrangement by spacing the centers of the openings from each other. This dimensional change in the plan view layout prevents the emission layer from disconnecting while still allowing vertical electrical connection through the contact member.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the light emitting region is positioned closer to the contact member, then electrical connection is shorter, but the emission layer may disconnect during operation

Engineering Contradiction:

Improveemission layer stabilityVSAvoidelectrical connection efficiency

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The asymmetric positioning of the second opening relative to the first opening creates a spatial buffer that stabilizes the emission layer. The light emitting region is disposed away from the contact member in a controlled asymmetric manner, preventing disconnection while maintaining sufficient electrical connection through the contact member structure.

Inventive Principle:

Principle #4Asymmetry

3Manufacturing precision

If the openings are aligned concentrically, then manufacturing precision requirements are lower, but luminance deviations between pixels increase

Engineering Contradiction:

Improveopening alignment toleranceVSAvoidluminance uniformity

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

By intentionally creating asymmetric spacing between the centers of the first and second openings, the patent eliminates the luminance deviations that occur with concentric alignment. This asymmetric configuration ensures uniform light emission across pixels while maintaining reasonable manufacturing precision requirements.

Inventive Principle:

Principle #4Asymmetry

4Area of stationary object

If the pixel structure maximizes light emission region area, then display brightness improves, but the risk of diode disconnection increases

Engineering Contradiction:

Improvelight emission region areaVSAvoiddiode connection reliability

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The asymmetric spacing of opening centers allows the light emission region to be maximized in area while the emission layer remains stabilized and disconnected-free. The asymmetric configuration provides structural support that prevents diode disconnection even as the emission region expands.

Inventive Principle:

Principle #4Asymmetry

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 design enhances the light emission period by preventing disconnection of the emission layer, reducing luminance deviations between pixels, and improving image quality by maintaining constant output current, thus optimizing the pixel structure for improved LED display performance.

Implementation Method 1

a capacitor electrode overlapping the driving gate electrode to form a capacitor

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS11469286B2Display device with capacitor electrode overlapping gate electrode

Publication Date: 2022.10.11 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a substrate, a first transistor disposed on the substrate and including a first active pattern having a first channel region, a first source region, a first drain region, and a first gate electrode, a first insulating layer disposed on the first transistor, a first electrode disposed on the first insulating layer and electrically connected to the first drain region, a second insulating layer having a first opening disposed on the first electrode, a first contact member disposed on the second insulating layer and electrically connected to the first electrode through the first opening, a third insulating layer having a second opening disposed on the first contact member, and a pixel electrode disposed on the third insulating layer and electrically connected to the first contact member through the second opening, and an emission layer disposed on the pixel electrode.