Backlight Module Rectangular Annular Step Fixing
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Solution Overview
Problem
The stability of backlight modules in vehicle-mounted liquid crystal display apparatuses is insufficient due to the active state of the light guide plate, affecting the display effect.
Innovation Solution
A backlight module design that includes a back plate, a plastic frame, a light source assembly, a reflective sheet, a light guide plate, and an optical membrane group, where the light guide plate and reflective sheet are fixed through rectangular annular steps and double-sided adhesive tapes, enhancing stability and assembly convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the light guide plate is left in an active state without fixed positioning, then the assembly process is simpler, but the overall stability of the backlight module is insufficient
Solution Approach 1:
The light guide plate's own structure is utilized for self-fixing. The first rectangular annular step and second rectangular annular step are formed directly on the light guide plate, creating self-contained positioning structures that eliminate the need for external fixing mechanisms.
Solution Approach 2:
The fixing structure is segmented into multiple functional zones: the first rectangular annular step for reflective sheet positioning, the second rectangular annular step for light guide plate edge positioning, and the third rectangular annular step for optical membrane group positioning. Each segment independently stabilizes a specific component.
2Stability of the object's composition
If multiple rectangular annular steps and adhesive tapes are used to fix components, then the stability is improved, but the assembly complexity increases
Solution Approach 1:
The light guide plate serves multiple functions: it guides light, provides structural support, and contains integrated positioning steps that automatically locate and stabilize the reflective sheet and optical membrane group, reducing the need for additional assembly operations.
Solution Approach 2:
Multiple functions are merged into the light guide plate structure: lighting function, structural support function, and positioning function. The positioning steps are integrated directly into the light guide plate, combining what would traditionally be separate components into one unified structure.
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
The design improves the overall stability of the backlight module by securely fixing the reflective sheet and light guide plate, thereby enhancing the display effect and facilitating assembly.
Implementation Method 1
a portion of the reflective sheet close to an outer edge of the reflective sheet is bonded to the first rectangular annular step through a first double-sided adhesive tape
Data Source
AI summary
A backlight module includes a back plate, a plastic frame disposed on one side of the back plate and connected with the back plate, a light source assembly located on an inner side of the plastic frame, and a reflective sheet, a light guide plate, and an optical membrane group sequentially stacked and located on the inner side of the plastic frame; the light source assembly includes a circuit board and a light source disposed on a first side surface of the circuit board, and the light source is located at a first side edge of the light guide plate; the light guide plate includes a first surface facing the reflective sheet and a second surface facing away from the reflective sheet; a first rectangular annular step and a second rectangular annular step are provided on an end face of the plastic frame facing the back plate.