Flexible Circuit Board ESD Detection and Reset for OLED Panels

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Solution Overview

Problem

OLED display panels in the related art have insufficient Electro-Static Discharge (ESD) resistance capability, leading to potential damage and reduced reliability.

Innovation Solution

A flexible circuit board incorporating an electrostatic discharge protection circuit, detection circuit, and switch circuit, along with a three-layer structure design for enhanced ESD protection, including a first and second ground layer with a via hole connection, and a switch transistor to timely reset the display panel during ESD events.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional OLED display panel design is used, then narrow borders and high screen-to-body ratio are achieved, but ESD resistance capability is insufficient

Engineering Contradiction:

ImproveESD resistance capabilityVSAvoidproduct reliability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent implements preliminary protective actions by incorporating an ESD protection circuit and detection circuit that are activated before electrostatic discharge can damage the display panel. The detection circuit monitors for ESD conditions and triggers the protection circuit in advance, preventing damage before it occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces an intermediary ESD protection circuit and detection circuit between the display panel and external environment. These intermediary components detect ESD conditions and intervene to protect the display panel, acting as a mediator that absorbs or redirects harmful electrostatic discharge away from critical components.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If ESD protection circuits are added to improve ESD resistance, then device complexity increases

Engineering Contradiction:

ImproveESD resistance capabilityVSAvoidcircuit complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent merges the ESD protection function with the existing circuit architecture by integrating the detection circuit and protection circuit into the current display panel structure. The switch circuit is combined with existing signal lines, and the protection functionality is merged into the overall control logic, reducing the need for separate dedicated protection components.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The detection circuit and protection circuit are designed to serve multiple functions: they not only protect against ESD but also monitor display panel status and can trigger reset operations. This multi-functionality reduces the need for separate dedicated ESD protection components, simplifying the overall device architecture.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260020145A1Flexible circuit board, display module and display device

Publication Date: 2026.01.15 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

A flexible circuit board, a display module and a display device are provided. The flexible circuit board includes: an electrostatic discharge protection circuit, an electrostatic discharge detection circuit and a switch circuit; an input end of the electrostatic discharge detection circuit is coupled to an output end of the electrostatic discharge protection circuit, and an output end of the electrostatic release detection circuit is coupled to a control end of the switch circuit; a first end of the switch circuit, a reset signal output end of an application processor, and a reset signal input end of a Display Driver Integrated Circuit (DDIC) are coupled to the first node, and a second end of the switch circuit is coupled to a ground.