Display Bridge Line Layout to Prevent Touch Signal Interference

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Solution Overview

Problem

Existing display devices face issues with parasitic transistors causing touch signal interference due to parasitic capacitance between touch and data or scan fan-out lines, leading to touch sensing errors.

Innovation Solution

The display device incorporates a bridge line design with increased distance between the bridge line and the oxide-based active layer, preventing parasitic transistors and ensuring proper initialization voltage application, thereby reducing Mura and poor brightness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the bridge line is disposed close to the oxide-based active layer to reduce line resistance and improve electrical connection, then electrical conductivity is improved, but parasitic transistors are formed causing touch signal interference

Engineering Contradiction:
Improveelectrical connection reliabilityVSAvoidparasitic capacitance interference
Core Design Contradiction:
ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The bridge line is configured to extend in the first direction (horizontal) while the oxide-based active layer extends in the second direction (vertical), creating a spatial separation where the bridge line overlaps with the gate electrode rather than the active layer. This dimensional arrangement eliminates parasitic transistor formation while maintaining electrical connection reliability.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The gate electrode serves as an intermediary structure that the bridge line overlaps with, allowing the bridge line to be positioned away from the oxide-based active layer. This intermediary arrangement prevents direct contact between the bridge line and active layer, thereby preventing parasitic transistor formation while still enabling proper electrical connections through the gate electrode pathway.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the bridge line is moved away from the oxide-based active layer to prevent parasitic transistors, then parasitic capacitance is reduced, but electrical connection distance increases

Engineering Contradiction:
Improveparasitic capacitanceVSAvoidbridge line length
Core Design Contradiction:
Object-affected harmful factorsVSLength of stationary object

Solution Approach 1:

Instead of moving the bridge line away in the vertical direction (increasing distance), the bridge line is reconfigured to extend horizontally in the first direction and overlap with the gate electrode. This dimensional change maintains a short connection path while achieving separation from the harmful oxide-based active layer region.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The bridge line serves multiple functions: it provides electrical connection for data signals while simultaneously overlapping with the gate electrode to avoid parasitic transistor formation. This multi-functional configuration allows the same structure to achieve both electrical connectivity and parasitic prevention without requiring additional components or increased length.

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Device complexity

If the bridge line overlaps with the oxide-based active layer to simplify layout, then device complexity is reduced, but parasitic transistors cause touch sensing errors

Engineering Contradiction:
Improvelayout complexityVSAvoidtouch sensing accuracy
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The bridge line is configured to overlap with the gate electrode in the horizontal direction rather than vertically overlapping with the oxide-based active layer. This dimensional reconfiguration simplifies the layout by maintaining a planar structure while eliminating parasitic transistor formation, thus preserving touch sensing accuracy without increasing device complexity.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The bridge line is specifically positioned to overlap only with the gate electrode region, creating a localized configuration that avoids the oxide-based active layer. This local quality adjustment allows the bridge line to maintain simple layout connectivity in the gate electrode area while preventing parasitic transistor formation in the active layer area, thereby preserving touch sensing reliability.

Inventive Principle:
Principle #3Local quality

Data Source

PatentUS20250374778A1Display device
Publication Date: 2025.12.04 SAMSUNG DISPLAY CO LTD
  • US20250374778A1 patent drawing
  • US20250374778A1 patent drawing
  • US20250374778A1 patent drawing

AI summary

A display device includes a display area including a plurality of pixels, a display driver disposed outside the display area to apply a data voltage, a plurality of data lines for applying the data voltage to the plurality of pixels, and a bridge line electrically connecting some of the data lines with the display driver. The bridge line includes a first bridge line extended from the display driver in a first direction, and a second bridge line connected to the first bridge line and extended in a second direction intersecting the first direction. The second bridge line includes a plurality of first portions extended in the second direction and spaced apart from each other in the second direction, and a second portion disposed on the first portions and electrically connecting the first portions.