Pixel Circuit Structure for Stable Display Device Characteristics

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Solution Overview

Problem

Conventional display apparatuses suffer from defects due to changes in device characteristics, primarily attributed to structural issues in the pixel circuit.

Innovation Solution

The proposed solution involves an improved structure for the pixel circuit, which includes a substrate with specific layers and configurations such as active layers, gate layers, and connection lines, designed to reduce defects and enhance performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional pixel circuit structure is used, then the device can be manufactured with standard processes, but defects occur due to changes in device characteristics

Engineering Contradiction:

Improvedevice characteristics stabilityVSAvoidpixel circuit structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The gate electrode is divided into two separate gate electrodes (first gate electrode and second gate electrode), each controlling different regions of the semiconductor layer. This segmentation allows independent optimization of threshold voltage control and current driving capability, improving device characteristics stability without requiring complete structural redesign

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the semiconductor layer are provided with different gate control structures - the first gate electrode controls the first region while the second gate electrode controls the second region. This local differentiation enables tailored electrical characteristics in different areas, reducing defects caused by uniform structure limitations

Inventive Principle:

Principle #3Local quality

2Reliability

If the gate electrode is divided into two separate gate electrodes, then device characteristics stability is improved, but the manufacturing process becomes more complex

Engineering Contradiction:

Improvepixel circuit performanceVSAvoidpixel circuit fabrication

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The first gate electrode and second gate electrode are merged into a single gate electrode structure in subsequent processing steps, forming an integrated gate that simplifies the manufacturing process while maintaining the functional benefits of segmented control during fabrication

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250048837A1Pixel and display apparatus including the same

Publication Date: 2025.02.06 SAMSUNG DISPLAY CO LTD

AI summary

The display apparatus includes a substrate, a first active layer disposed on the substrate, a first gate layer disposed on a layer covering the first active layer, the first gate layer including a first gate electrode, a second gate layer disposed on a layer covering the first gate layer, the second gate layer including an initialization line including a first part of a second electrode; a second active layer disposed on a layer covering the second gate layer, the second active layer including a second active region overlapping the first part of the second electrode; a third gate layer disposed on a layer covering the second active layer, the third gate layer including a second part of the second electrode overlapping the second active region; and a first source/drain layer disposed on a layer covering the third gate layer, the first source/drain layer including a first connection line.