Backlight Bag Structure Prevents Dust in LCD
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Solution Overview
Problem
Conventional liquid crystal display devices suffer from foreign substance invasion, such as dust and motes, through minute clearances between components, leading to black spot failures and display irregularities due to intercepted light, which existing prevention methods fail to adequately address.
Innovation Solution
The liquid crystal display device incorporates a structure where the light guide and optical sheets are housed within a bag-like body formed by larger optical sheets, with the periphery parts bonded together to prevent foreign substance intrusion, eliminating the need for additional components and maintaining irradiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional clearances are provided between the upper frame and liquid crystal display panel for assembly and display purposes, then ease of manufacture and display functionality are improved, but foreign substance invasion occurs leading to black spot failures
Solution Approach 1:
A sealing member is introduced as an intermediary component between the upper frame and the liquid crystal display panel. This sealing member fills the clearance space, preventing foreign substances from invading the display device while maintaining the necessary gap for assembly and display functionality. The sealing member acts as a mediator that resolves the contradiction by providing both sealing protection and structural compatibility.
2Ease of manufacture
If clearances are provided between the mold member and optical components for assembly purposes, then ease of manufacture is improved, but foreign substance invasion occurs through these clearances
Solution Approach 1:
The sealing member serves as an intermediary that is disposed in the clearance between the mold member and optical components (light guide, optical sheets). It prevents foreign substances such as dust and motes from invading through these clearances while maintaining the assembly-friendly gap structure. This resolves the contradiction by providing sealing functionality without eliminating the manufacturing advantages of clearances.
3Device complexity
If foreign substances intrude into the backlight device, then manufacturing simplicity is maintained, but light interception occurs causing black spot failures
Solution Approach 1:
The sealing member is disposed within the backlight device structure as an intermediary protective element. It prevents foreign substances from intruding into the optical path between the light guide and optical sheets, thereby preventing light interception and black spot failures. This addition maintains overall structural simplicity while significantly improving display quality and reliability.
Data Source
AI summary
A liquid crystal display device includes a liquid crystal display panel and a backlight device. The backlight device includes: a light guide for emitting a planar light beam, a first optical sheet disposed on a back side of the light guide, and an optical sheet group disposed on an irradiation-surface side of the light guide and including a plurality of optical sheets arranged in stacked relation. Periphery parts of the first optical sheet and at least one second optical sheet of the optical sheet group are bonded together to form a bag shape, and the light guide and the other optical sheets are retained in the bag-like body formed of the first optical sheet and the second optical sheet.