Flexible PCB Covering OLED and Battery with Large Curvature Radius

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Solution Overview

Problem

Existing display apparatuses with flexible printed circuit boards (PCBs) face issues such as damage, chip cracks, and adhesion failures due to small radii of curvature and improper placement of components, particularly when integrating a driver-integrated circuit and adhering the PCB to an organic light emitting display and battery.

Innovation Solution

A display apparatus design featuring a flexible printed circuit board (PCB) that covers both the organic light emitting display and battery, with a larger radius of curvature and strategically placing the driver-integrated circuit outside the battery, along with a bracket for stability and a light blocking portion on the battery to simplify manufacturing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the flexible PCB is adhered to cover the organic light emitting display and battery with a small radius of curvature, then the adhesion area is increased, but the PCB suffers from damage and chip cracks

Engineering Contradiction:

ImprovePCB adhesion reliabilityVSAvoidPCB structural strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent changes the curvature radius parameter of the flexible PCB from small to large. Specifically, the PCB is designed to extend beyond the battery edges by 5-15mm on each side, creating a larger bending radius that prevents film lead cracks and structural damage while maintaining adequate adhesion coverage of the display and battery assembly.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If the driver-integrated circuit is placed inside the battery area, then the device complexity is reduced, but the PCB and chip suffer from physical shock damage

Engineering Contradiction:

ImprovePCB layout complexityVSAvoidChip reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The driver-integrated circuit is extracted from the battery area and placed on the flexible PCB extending outside the battery. This positioning removes the chip from the high-stress zone during battery adhesion, preventing physical shock damage and crack generation while maintaining a relatively simple overall device structure.

Inventive Principle:

Principle #2Taking out (Extraction)

3Object-affected harmful factors

If additional light blocking tape is applied over the battery, then light leakage is prevented, but the manufacturing process becomes more complex

Engineering Contradiction:

ImproveLight leakage preventionVSAvoidManufacturing process simplicity

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The flexible PCB is designed to serve multiple functions: it provides electrical connections, structural support, and light blocking. By extending the PCB outside the battery edges by 5-15mm, it simultaneously acts as the circuit substrate and eliminates the need for separate light blocking tape, simplifying the manufacturing process while preventing light leakage.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8829508B2Organic light emitting display comprising a battery and a flexible printed circuit board

Publication Date: 2014.09.09 SAMSUNG DISPLAY CO LTD

AI summary

A display apparatus including an organic light emitting display including a terminal portion, a battery disposed on a surface of the organic light emitting display, and a flexible printed circuit board (PCB) bent to cover the organic light emitting display and the battery, a side of the flexible PCB being connected to the terminal portion and another side of the flexible PCB extending outside and attached to the battery.