Back Plate Receiving Slots for Optical Element Positioning
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Solution Overview
Problem
In ultra-thin and frameless liquid crystal display devices, positioning optical elements in the backlight module is a key challenge due to the need for efficient accommodation and secure fixation of components without compromising the device's thinness and framelessness.
Innovation Solution
A back plate design with side plates and receiving slots, along with buffer members, provides a secure and flexible mechanism for accommodating and fixing optical elements, ensuring proper alignment and support within the backlight module while maintaining the device's thin profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional positioning methods are used for optical elements in the backlight module, then the device structure is simple, but the device thickness increases and frameless design becomes difficult
Solution Approach 1:
The back plate is divided into a bottom plate and multiple side plates that are connected together. The side plates extend from the edges of the bottom plate to form a frame structure with an accommodation space in the middle. This segmentation allows the back plate to provide structural support and positioning functions while maintaining a thin profile, as each plate can be optimized independently for thickness and strength.
Solution Approach 2:
Receiving slots are formed by penetrating the side plates in a direction perpendicular to their inner surfaces, creating a three-dimensional positioning structure. The receiving slots have varying cross-sectional dimensions along their length, with the positioning portion having a larger dimension than the receiving head and receiving tail. This dimensional variation enables precise positioning of optical elements while keeping the overall structure thin.
2Manufacturing precision
If the back plate structure is simplified to reduce thickness, then the device becomes thinner, but the positioning precision and fixation reliability of optical elements deteriorate
Solution Approach 1:
The receiving slots are designed with non-uniform cross-sectional dimensions along their length. The positioning portion of the receiving slot has a larger dimension in the third direction compared to the receiving head and receiving tail. This local variation in geometry provides enhanced positioning precision at the critical midpoint while keeping other portions of the structure thin and simple.
Solution Approach 2:
The receiving slots are formed by directly penetrating the side plates during the molding process, eliminating the need for separate positioning features or additional components. The varying cross-sectional dimensions of the receiving slots themselves provide the positioning function, allowing the structure to serve multiple functions (support, positioning, fixation) without increasing overall complexity.
3Manufacturing precision
If receiving slots with varying cross-sectional dimensions are formed in side plates, then positioning precision is improved, but manufacturing complexity increases
Solution Approach 1:
The receiving slots with varying cross-sectional dimensions are integrated directly into the side plates during the injection molding process. The varying dimensions are formed as part of the mold cavity design, allowing complex geometries to be created in a single manufacturing step without requiring secondary operations or assembly of multiple components.
Solution Approach 2:
The receiving slots serve multiple functions simultaneously: they provide structural support through the side plates, enable precise positioning of optical elements through their varying cross-sectional dimensions, and facilitate fixation through their penetration design. This multi-functionality reduces the need for separate components and simplifies the overall manufacturing process despite the geometric complexity.
Data Source
AI summary
A back plate includes: a bottom plate; side plates on the same side of the bottom plate, wherein an accommodation space enclosed by both the bottom plate and the side plates is formed, the side plates include a first side plate including an inner surface facing the accommodation space; and receiving slots which are respectively located in the side plates and include a first receiving slot in the first side plate. The first receiving slot penetrates the first side plate in a first direction. The first receiving slot includes a receiving head, a positioning portion and a receiving tail, which are sequentially arranged from a slot bottom toward a slot opening in a second direction. A size of at least a part of the positioning portion in a third direction is greater than a size of each of the receiving head and the receiving tail in the third direction.