Display Substrate Control Circuit for Signal Isolation

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Solution Overview

Problem

During the manufacturing of display panels, conductive residues at the cutting line can cause short circuits and poor display performance due to the connection of edge signal terminals, leading to abnormal displays and poor wiring.

Innovation Solution

A display substrate with a control circuit that connects and disconnects signal terminals from connection structures, preventing signal flow back during the display stage and isolating potential short circuits, thereby preventing conductive residues from affecting display signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If edge signal terminals are connected to connection structures for testing, then test functionality is achieved, but conductive residues cause short circuits and poor display performance

Engineering Contradiction:

Improvedisplay performanceVSAvoidconductive residues causing short circuit

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent divides the connection between signal terminals and connection structures into two separate states: connected state during testing and disconnected state during display. The control circuit acts as a segmented intermediary that can be selectively activated or deactivated to isolate the display region from the wiring region, preventing harmful conductive residues from affecting display signals while maintaining test functionality when needed.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The control circuit serves as an intermediary component between the signal terminals and connection structures. It mediates the connection by controlling the on/off state of switch transistors, allowing test signals to pass through during testing while blocking display signals from being affected by conductive residues during the display stage. This intermediary mechanism resolves the contradiction by providing conditional connectivity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If conductive residues are removed by cleaning, then short circuit is prevented, but cleaning difficulty and potential scratches increase

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidcleaning difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies preliminary action by designing the control circuit to be activated during the testing stage before the display stage. This allows testing to be completed when the control circuit can establish connections, and then the control circuit is deactivated before display to prevent any potential short circuits from conductive residues. The preliminary testing action eliminates the need for subsequent cleaning operations to ensure electrical reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of trying to remove conductive residues through cleaning (which has difficulties and risks), the patent converts the potential harm into a benefit by using the control circuit's selective connectivity. The control circuit allows testing to proceed with connections established, then isolates the display region to prevent harm from conductive residues, turning a manufacturing challenge into a functional solution.

Inventive Principle:

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

3Reliability

If control circuit is added to connect/disconnect signal terminals, then short circuit prevention is achieved, but device complexity increases

Engineering Contradiction:

Improvesignal isolationVSAvoidcircuit structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The control circuit is designed with multi-functionality to justify its inclusion. It performs multiple functions: enabling test signal transmission during testing, isolating display signals during display operation, and providing a unified control mechanism for both stages. This universal design reduces the need for separate dedicated circuits for testing and display isolation, thereby limiting the increase in overall device complexity while achieving reliable signal isolation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11200819B2Display substrate and manufacturing method thereof, display panel, display motherboard and testing method thereof, and display device

Publication Date: 2021.12.14 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

A display substrate and a manufacturing method thereof, a display panel, a display motherboard and a testing method thereof, and a display device are provided in the present disclosure. The display substrate is provided with a display region and at least a wiring region outside the display region. The display substrate includes a base substrate and a plurality of connection structures on the base substrate. The plurality of connection structures are connected to a plurality of edge signal terminals through a control module. All of the plurality of connection structures, the plurality of edge signal terminals and the control module are located in the wiring region. The plurality of edge signal terminals are located on an edge of the wiring region. The control circuit is configured to control the connection or disconnection between the plurality of signal terminals and the plurality of connection structures.