Reflecting Sheet with Restricting Member for LED Display
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Solution Overview
Problem
In flat-screen display devices, the existing configuration of the light source device with a thick lens cover causes issues with price reduction, weight reduction, and thickness reduction due to deformation and increased component count when a thin lens cover is used, and instability of lens positions with a large number of LEDs.
Innovation Solution
A light source device with a reflecting sheet that includes a through hole and a restricting member, such as a convex portion or slit, to prevent the sheet from rising and deforming, allowing for easy assembly without screws, maintaining stability even with a large number of LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a thick lens cover is used, then the lens cover hardly deforms and positioning and fixing of the lens is achieved, but the price, weight, and thickness of the display device increase
Solution Approach 1:
The patent uses a thin reflecting sheet instead of a thick lens cover, allowing the sheet to be flexible yet functional. The thin sheet is constrained by the lens flange to prevent deformation, achieving both weight reduction and positional stability.
Solution Approach 2:
The lens flange acts as an intermediary component that transfers the constraint force from the rigid LED board to the thin reflecting sheet. This mediator enables the thin sheet to maintain stability without requiring additional fastening components.
2Weight of stationary object
If a thin lens cover is used, then the price, weight, and thickness of the display device are reduced, but the lens cover deforms easily requiring more male screws
Solution Approach 1:
The patent extracts the fastening function from the traditional screw-based system and integrates it into the lens flange structure. The flange itself provides the constraining force, eliminating the need for additional male screws to secure the thin reflecting sheet.
Solution Approach 2:
The patent merges the positioning and fixing functions into the lens flange structure. The flange simultaneously serves as the mounting interface and the constraint mechanism, reducing the total component count while maintaining stability.
3Stability of the object's composition
If more male screws are used to prevent deformation, then the lens cover positioning is improved, but the number of components and process steps increases causing cost increase
Solution Approach 1:
The lens flange provides self-constraining capability by utilizing its own geometric structure (flange diameter larger than through hole diameter) to automatically prevent deformation of the reflecting sheet, eliminating the need for additional fastening components and simplifying assembly.
4Power
If a large number of LEDs are employed, then the light output is increased, but the position of each lens becomes unstable
Solution Approach 1:
The thin reflecting sheet with through holes provides a flexible yet stable mounting surface for multiple lenses. The sheet's thin profile reduces interference with lens positioning, while the lens flanges provide individual constraint points that maintain stability even with many LEDs.
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 configuration achieves price reduction, weight reduction, and thickness reduction in the display device by preventing deformation of the reflecting sheet and maintaining stability without increasing the number of components or screws, enhancing assembly workability.
Implementation Method 1
a lens attached to the surface so as to diffuse light emitted from the LED
Implementation Method 2
a reflecting sheet having a through hole in the inside of which the lens is disposed and reflecting light emitted from the LED at an opposite side of the surface
Data Source
AI summary
A light source device includes a circuit board having a LED mounted on a surface, a lens attached to the surface so as to diffuse light emitted from the LED, a reflecting sheet having a through hole in the inside of which the lens is disposed and reflecting light emitted from the LED at an opposite side of the surface, and a restricting member which is disposed at one of an edge of the through hole in the reflecting sheet and the lens, and restricts a deviation of the reflecting sheet in a direction departing from the surface.