Backlight Module Protrusion Unit Fixes Flexible Circuit Board

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Solution Overview

Problem

Conventional backlight modules with LED light sources experience light leakage due to poor adhesion of flexible circuit boards to frames or light guiding plates, leading to reduced light utilization and brightness in display devices.

Innovation Solution

A backlight module design featuring a frame with a protrusion unit that contacts and presses the flexible circuit board, ensuring secure fixation and preventing light leakage by using a protrusion unit with a top and bottom contact surface, which is preferably made of flexible material and connected to the frame, to maintain the light-emitting element's light within the guiding plate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If adhesive is used to fix the flexible circuit board to the frame, then the flexible circuit board can be mounted, but the adhesive does not stick well causing slits and light leakage

Engineering Contradiction:

Improveadhesion qualityVSAvoidlight leakage

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the chemical adhesion system (adhesive) with a mechanical fastening system (protrusion unit). The protrusion unit physically clamps the flexible circuit board between itself and the light guiding plate, eliminating reliance on adhesive bonding. This mechanical approach prevents slits and ensures consistent clamping force, thereby preventing light leakage while maintaining reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The protrusion unit acts as an intermediary component between the frame and the flexible circuit board. It provides a dedicated mechanical interface that securely holds the flexible circuit board in place, mediating the connection between structural elements and preventing direct contact issues between the flexible circuit board and frame that cause adhesion failures.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If adhesive is used to fix the flexible circuit board, then mounting is achieved, but the flexible circuit board bends upwards causing light to emit outside the light guiding plate

Engineering Contradiction:

Improvemounting processVSAvoidposition stability

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent replaces the adhesive-based mounting system with a mechanical clamping system using the protrusion unit. This mechanical system provides immediate and reliable position stability by physically constraining the flexible circuit board, preventing upward bending during and after assembly. The protrusion unit maintains consistent pressure to keep the flexible circuit board flat against the light guiding plate.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The protrusion unit is pre-formed as an integral part of the frame structure, providing the clamping function before assembly. This preliminary preparation ensures that when the flexible circuit board is installed, the position stability is immediately established without requiring additional steps or materials, thereby maintaining ease of manufacture while achieving precision.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If conventional adhesive fixation is used, then the flexible circuit board can be attached, but light leakage occurs reducing LED light source utilization rate

Engineering Contradiction:

Improvelight source utilization rateVSAvoidlight leakage

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent replaces the adhesive fixation system with a mechanical clamping system using the protrusion unit. This mechanical approach ensures complete contact and sealing between the flexible circuit board and light guiding plate, preventing light leakage paths that would waste LED light. By eliminating adhesion failures, the system maximizes the utilization rate of the LED light source for its intended function.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS7830470B2Backlight module

Publication Date: 2010.11.09 AU OPTRONICS CORP

AI summary

The present invention discloses a backlight module. The backlight module of the present invention includes a frame, a flexible circuit board, a light emitting unit, and a light guide plate. The frame has a bottom surface, an inner sidewall adjacent and perpendicular to the bottom surface, and a protrusion unit. Protrusion unit protrudes from the inner sidewall and is parallel to the bottom surface. The flexible circuit board is disposed beneath the protrusion unit and electrically connected to the light emitting unit. The light guide plate is disposed on the bottom surface and is adjacent to the light emitting unit. Furthermore, the protrusion unit is disposed at the corner of the two adjacent inner sidewalls of the frame, and a substrate presses the protrusion unit which further presses the flexible circuit board, and thus the flexible circuit board and the light emitting unit connected thereto can be fixed in the frame.