Display Unit ESD Protection via Semi-Threaded Screw

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Solution Overview

Problem

LCD display units face issues with electrostatic discharge (ESD) protection, leading to abnormal displays and economic losses due to the rigid connection between the print circuit board and the back plate, which causes stress concentration and potential fractures in the flexible print board during hinge life tests.

Innovation Solution

A display unit design utilizing a semi-threaded screw to create a moving gap between the print circuit board and the back plate, incorporating electrostatic discharge regions and units connected through flexible print boards to form discharge channels, ensuring complete discharge of static electricity and preventing component damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the print circuit board is rigidly connected to the back plate through a screw, then the electrostatic discharge protection is improved, but the flexible print board is prone to stress concentration and fractures during hinge life tests

Engineering Contradiction:
Improveelectrostatic discharge protectionVSAvoidflexible print board durability
Core Design Contradiction:
ReliabilityVSStrength

Solution Approach 1:

The electrostatic discharge path is segmented into two separate channels: the first electrostatic discharge channel connects the first electrostatic discharge region on the print circuit board to the back plate through the screw, while the second electrostatic discharge channel connects the first electrostatic discharge unit to the back plate. This segmentation allows the ESD function to be achieved without requiring the flexible print board to bear mechanical stress from rigid connection.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The screw serves as an intermediary element that provides both mechanical connection and electrostatic discharge path. By connecting the first electrostatic discharge region to the back plate through the screw, the ESD function is achieved without requiring the flexible print board to be rigidly fixed, thus avoiding stress concentration on the flexible print board.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Strength

If the flexible print board is allowed to move freely to avoid stress concentration, then the durability during hinge tests is improved, but the electrostatic discharge connection may become unreliable

Engineering Contradiction:
Improveflexible print board durabilityVSAvoidelectrostatic discharge connection
Core Design Contradiction:
StrengthVSReliability

Solution Approach 1:

The electrostatic discharge function is segmented into two independent channels: the first channel uses the screw connection to provide a stable ESD path from the print circuit board to the back plate, while the second channel provides an additional ESD path through the first electrostatic discharge unit. This segmentation ensures that the flexible print board can move freely without compromising the reliability of the ESD connection.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent introduces electrostatic discharge units and regions that change the electrical parameters of the connection system. By adding these specialized ESD components, the system maintains reliable electrostatic discharge capability even when the flexible print board has movement freedom, as the ESD paths are designed to remain effective throughout the range of motion.

Inventive Principle:
Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design effectively protects against ESD by ensuring complete discharge of static electricity, reducing the risk of component failure, and allowing for a more reliable hinge test without affecting the project schedule, thereby improving the yield of LCD display units.

Implementation Method 1

the first electrostatic discharge region is connected to the back plate through the screw to form a first electrostatic discharge channel, and the first electrostatic discharge unit is connected to the back plate to form a second electrostatic discharge channel

Methodology Applied
Scientific EffectElectrostatic discharge: Electrostatic Discharge

Data Source

PatentUS11846853B2Display unit and display apparatus
Publication Date: 2023.12.19 CHONGQING BOE OPTOELECTRONICS
  • US11846853B2 patent drawing
  • US11846853B2 patent drawing
  • US11846853B2 patent drawing

AI summary

Provided are a display unit and a display apparatus, the display unit includes a back plate and a print circuit board disposed on the back plate, wherein the print circuit board is connected to the back plate through a screw, and is provided with a first electrostatic discharge region and a first electrostatic discharge unit; the first electrostatic discharge region is connected to the back plate through the screw to form a first electrostatic discharge channel, and the first electrostatic discharge unit is connected to the back plate to form a second electrostatic discharge channel.