Die-Casting Back Plate Recess and Rivet Spacing for Vehicle Display
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Solution Overview
Problem
Vehicle-mounted liquid crystal display screens face display defects due to deformation and collision issues in high-temperature and high-frequency vibration environments, leading to dot surface damage and image quality issues, as the existing die-casting back plate design fails to adequately prevent movement and collision between the light-guiding plate and reflection sheet.
Innovation Solution
A die-casting back plate with a recess region and strategically positioned rivets is used to assemble the backlight assembly, along with a buffer member and double-sided adhesive tapes to fix the optical lamination layers, preventing deformation and collision between the light-guiding plate and reflection sheet, and ensuring secure attachment to the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the die-casting back plate is fixed to the vehicle body using several screws, then the backlight assembly can be securely mounted, but the light-guiding plate and reflection sheet may deform and collide in high-temperature and high-frequency vibration environments
Solution Approach 1:
The back plate is divided into a first back plate and a second back plate that can relatively move, allowing the mounting structure to accommodate thermal expansion and vibration without transmitting stress to the optical components, thus preventing deformation and collision
Solution Approach 2:
The invention introduces a gap between the light-guiding plate and the back plate, and uses a buffer member to manage the space. This gap parameter allows the structure to absorb thermal expansion and vibration effects, preventing the light-guiding plate from colliding with the back plate while maintaining secure mounting
2Object-affected harmful factors
If the backlight assembly is rigidly fixed to prevent movement, then collision between components can be prevented, but the assembly cannot accommodate thermal expansion and contraction in varying temperature environments
Solution Approach 1:
The second back plate is designed to be movable relative to the first back plate, creating a dynamic mounting structure that can adapt to thermal expansion and contraction. This dynamic design allows the assembly to accommodate temperature variations while the buffer member and gap prevent excessive movement that could cause collision
Solution Approach 2:
A buffer member is introduced between the light-guiding plate and the back plate to provide beforehand cushioning. This buffer member absorbs the effects of thermal expansion and vibration before they can cause collision, allowing the structure to be both stable and temperature-adaptable
3Device complexity
If the light-guiding plate is directly attached to the back plate, then assembly simplicity is maintained, but deformation and collision occur in high-temperature and high-frequency vibration environments
Solution Approach 1:
A buffer member is introduced as an intermediary between the light-guiding plate and the back plate. This adds a simple element to the assembly that prevents direct contact and potential collision, while the folded edges of the reflection sheet provide additional positioning without significantly increasing assembly complexity
Solution Approach 2:
The reflection sheet is folded along its edges to create a flexible positioning structure. These folded edges can adapt to slight movements and deformations caused by thermal expansion and vibration, maintaining component positioning precision while accommodating environmental variations
Data Source
AI summary
A backlight assembly and a display device are provided in the present disclosure. The backlight assembly includes an optical lamination layer and a die-casting back plate. The die-casting back plate defines an accommodation space for accommodating the optical lamination layer, the die-casting back plate includes an inner surface and an outer surface arranged opposite to each other, the inner surface is a surface facing a bottom surface of the optical lamination layer, a recess region is arranged on the inner surface, and a plurality of rivets configured to assemble the die-casting back plate onto an object to be assembled is arranged on the outer surface. The plurality of rivets is located in a region corresponding to the recess region and spaced apart from a boundary of the recess region by a spacing.