Backlight Module Reflector Support Frame Alignment
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Solution Overview
Problem
The existing direct type backlight modules face issues with the reflector not being securely attached to the circuit board due to a small contact area, which affects image uniformity and local dimming performance if the reflecting grids are not accurately aligned with the light source.
Innovation Solution
A support frame with parallel first and second support members is used to fix the reflector on the circuit board, ensuring proper alignment and attachment, and the reflector's reflecting grids accommodate the light emitting units, while support pillars maintain the diffusion plate at a specific height for uniform light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the reflector is directly attached to the circuit board with reflecting grids, then local dimming function is achieved, but the contact area is very small causing poor attachment reliability
Solution Approach 1:
A support frame is introduced as an intermediary component between the circuit board and the reflector. The support frame includes multiple support members that contact the circuit board at multiple points, providing stable attachment while holding the reflector in position. This mediator solves the contradiction by distributing the attachment force across multiple contact points rather than relying on the small contact area of the reflecting grids alone.
2Device complexity
If the reflector is directly attached to the circuit board, then structure is simplified, but the position alignment between reflecting grids and light source cannot be ensured
Solution Approach 1:
The support frame is pre-formed with support members positioned at specific locations that correspond to the light source positions. When assembled, the support frame automatically guides the reflector into the correct position, ensuring that the reflecting grids align with the light sources before final attachment. This preliminary positioning action ensures manufacturing precision without significantly increasing overall structural complexity.
3Reliability
If more support members are added to improve attachment, then attachment reliability is improved, but device complexity increases
Solution Approach 1:
The support frame is segmented into multiple independent support members distributed across the structure. Each support member provides localized attachment and positioning function. This segmentation allows the system to achieve high reliability through multiple contact points while keeping each individual support member simple in structure, thus balancing reliability and complexity.
Data Source
AI summary
A backlight module includes a circuit board, a plurality of light emitting units, a support frame, a reflector, and a diffusion plate. The light emitting units are disposed on the circuit board. The support frame includes a plurality of first support members, wherein the first support members are disposed on the circuit board in parallel. The reflector is disposed on the support frame. The reflector includes a plurality of reflecting grids, wherein the reflecting grids are accommodated between the first support members and the light emitting units are located in the reflecting grids. The diffusion plate is disposed above the reflector.