Vehicle Display Unit With Stress-Absorbing Mounting Elements
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Solution Overview
Problem
TFT-LCD display units in vehicles are prone to defects such as the Mura effect and mechanical damage due to compressive and tensile stresses from vibrations, which are exacerbated by their rigid structure.
Innovation Solution
The display unit is designed with independent housing halves for the TFT module and backlighting unit, connected via mounting elements with predetermined breaking points, allowing for a non-rigid assembly that absorbs mechanical stresses and prevents damage to the TFT module and joining layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the display unit uses a rigid structure to ensure stability and protection, then the protective housing and front panel are well-protected, but compressive and tensile stresses from vibrations are transmitted to the TFT module, causing defects such as the Mura effect
Solution Approach 1:
The housing is divided into two separate halves: a first housing half containing the TFT module and a second housing half containing the backlighting unit. These housing halves are not rigidly connected to each other, allowing independent movement and stress absorption. This segmentation prevents stress transmission from the protective housing to the TFT module while maintaining overall structural protection.
2Stability of the object's composition
If the TFT module and backlighting unit are rigidly connected to ensure structural stability, then the display unit maintains its shape, but vibrations and stresses are transmitted to the TFT module, leading to mechanical damage and optical defects
Solution Approach 1:
A joining layer is introduced between the TFT module and the front panel, and the housing halves are connected through non-rigid mounting elements. These intermediary elements decouple the rigid structural connection, allowing the housing to maintain its shape while preventing stress transmission to the TFT module. The joining layer acts as a buffer that absorbs mechanical stresses.
3Reliability
If multiple layers (protective housing, joining layer, front panel) are rigidly connected to ensure durability, then the display unit is well-protected, but internal reflections increase and mechanical stresses accumulate, reducing service life
Solution Approach 1:
The mounting elements are designed with predetermined breaking points that change the mechanical properties of the connection. During assembly, the elements are rigid to provide structural stability, but under vibration or stress, they break at predetermined points to become non-rigid, thereby reducing internal reflections and stress transmission while maintaining protection.
Data Source
AI summary
The aspects disclosed herein relate to a display unit and a method for producing a display unit, is to provide a display unit which is easy to produce and is not susceptible to compressive and tensile stresses acting on the protective housing. This object is achieved in that the TFT module is disposed within a first housing half and the backlighting unit is disposed within a second housing half, and in that the first housing half is connected to the second housing half by means of a plurality of mounting elements, the mounting elements having predetermined breaking points.