Backlight Module Curved Reflecting Sheet Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional backlight modules for flat panel displays require inefficient clamping mechanisms to secure the reflecting sheet and light-guide plate, leading to potential buckling issues that affect sealing and display quality, and result in direct light irradiation onto the display panel.
Innovation Solution
A backlight module with a protruding mechanism on the back housing forms a curved portion on the reflecting sheet, allowing it to conformally seal with the light-guide plate, eliminating gaps and preventing direct light projection onto the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lateral housing is used to clamp the reflecting sheet and light-guide plate together, then sealing between the components is improved, but assembly complexity and manufacturing time increase due to temporary deformation requirements
Solution Approach 1:
The invention removes the lateral housing component entirely from the assembly. Instead of using a separate clamping structure, the back housing itself is designed with an integrated protruding mechanism that directly engages with the reflecting sheet to provide the necessary sealing and positioning functions, thereby eliminating assembly complexity while maintaining sealing reliability
Solution Approach 2:
The invention merges the sealing function previously performed by the lateral housing into the back housing structure. The protruding mechanism on the back housing combines positioning, sealing, and support functions into a single integrated component, eliminating the need for separate clamping structures and temporary deformation processes
2Device complexity
If no lateral housing is used, then assembly complexity is reduced, but buckling of the light-guide plate occurs due to residual stress and environmental changes
Solution Approach 1:
The invention applies preliminary action by pre-forming a curved portion on the reflecting sheet that corresponds to the expected buckling deformation of the light-guide plate. This pre-positioned curvature compensates for residual stress and environmental changes, maintaining the flatness required for display quality without requiring complex assembly structures
Solution Approach 2:
The invention introduces curvature into the reflecting sheet design through a pre-formed curved portion. This curvature is strategically designed to counteract the positive buckling tendency of the light-guide plate, ensuring that the combined structure remains flat and stable under various operating conditions without requiring lateral housing constraints
3Reliability
If the light-guide plate is constrained to prevent negative buckling, then display quality is improved, but the gap between the reflecting sheet and light-guide plate increases, allowing direct light leakage
Solution Approach 1:
The invention applies preliminary anti-action by pre-forming a curved portion on the reflecting sheet that anticipates and counteracts potential buckling deformations. This pre-positioned curvature ensures continuous contact between the reflecting sheet and light-guide plate, preventing gaps that would allow direct light leakage while accommodating thermal and residual stress variations
Solution Approach 2:
The invention changes the geometric parameter of the reflecting sheet by introducing a pre-formed curved portion. This parameter change allows the reflecting sheet to dynamically adapt its shape in response to thermal expansion, residual stress, and humidity changes, maintaining optimal contact with the light-guide plate across different operating conditions to prevent light leakage
Data Source
AI summary
A backlight module includes a back housing, a top housing, a lamp, a light-guide plate, and a reflecting sheet. The back housing includes a bottom plate. The back housing and top housing form an accommodating space; the lamp is situated in the accommodating space. The light-guide plate is disposed on the bottom plate and has a lateral light-inputting surface and a bottom surface. Light emitted from the lamp enters the light-guide plate through the lateral light-inputting surface. The reflecting sheet is disposed between the light-guide plate and the bottom plate. The reflecting sheet includes a curved portion to enable the light-guide plate and the reflecting sheet to be combined conformingly.