Optical Sheet Identification for Backlight Assembly
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Solution Overview
Problem
Conventional backlight units face challenges in efficiently assembling optical sheets in the correct order and direction, leading to reduced luminance and uneven light distribution, and require significant time and labor for revisions due to the need for precise alignment of lug parts and notches, which complicates the identification of optical sheets and their information.
Innovation Solution
The solution involves using first and second optical sheets with identification parts at predetermined positions, allowing for easy recognition and assembly in the correct order and direction, and providing information indicating parts to simplify identification and handling without referencing specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If optical sheets are assembled using conventional lug parts and notches with sequential association, then the assembly order and direction can be controlled, but when part of the optical sheets is removed, all optical sheets placed on and over the removed sheet must be replaced, causing increased time and labor
Solution Approach 1:
The invention divides the optical sheet assembly into independent units with individual identification marks (first marks on first optical sheets, second marks on second optical sheets). This segmentation allows each sheet to be identified and tracked independently, so when one sheet is removed or replaced, only that specific sheet needs to be replaced rather than all sheets above it, reducing time and labor.
Solution Approach 2:
The invention applies preliminary action by providing identification marks on optical sheets before assembly. These marks (first marks on first optical sheets, second marks on second optical sheets) are prepared in advance to indicate the correct assembly order and direction. This preliminary marking system allows for easy identification during assembly and simplifies future maintenance or replacement operations.
2Reliability
If optical sheets are classified using trays with written names to prevent mixing, then discrimination between sheet types is improved, but the complexity of management and identification increases
Solution Approach 1:
The invention applies self-service by enabling optical sheets to identify themselves through built-in identification marks. First optical sheets have first marks and second optical sheets have second marks, allowing them to self-identify their type and assembly order without requiring external trays with written names. This eliminates the need for complex management systems while maintaining reliable discrimination between sheet types.
Solution Approach 2:
The invention uses visual differentiation (analogous to color changes) by providing distinct identification marks on different optical sheets. The first marks on first optical sheets and second marks on second optical sheets create visual differences that allow easy discrimination between sheet types during assembly, eliminating the need for external labeling systems.
3Manufacturing precision
If lug parts and notches are positioned to enable sequential association, then correct assembly is ensured, but any modification requires replacement of all affected optical sheets, increasing cost
Solution Approach 1:
The invention segments the identification system into independent marks on individual sheets. Each first optical sheet has its own first mark and each second optical sheet has its own second mark. This segmentation means that if modification is needed, only the affected sheets need to be replaced rather than all sheets in the assembly, reducing material loss and cost.
Solution Approach 2:
The invention applies discarding and recovering by allowing selective replacement of only the affected optical sheets when modification is needed. The identification marks enable easy identification of which sheets need to be discarded (removed) and which can be recovered (retained), minimizing waste and reducing replacement costs compared to replacing all sheets.
Data Source
AI summary
The invention provides a backlight unit, a liquid crystal display apparatus and a method of assembling the backlight unit in which a large number of optical sheets can be simply and surely assembled into a chassis in an appropriate order and direction, and is characterized by a first optical sheet which is a reference sheet and second optical sheets which are rest of the optical sheets. The first optical sheet is provided with first identification parts for specifying a layer of respective second optical sheets to be placed, and each of the second optical sheets is provided with a second identification part at a position corresponding to one of the first identification parts based on the layer position to be placed. The optical sheets are superposed so that each of the first identification parts is pared with the second identification part corresponding to the layer specified by the first identification part.