Backlight Module Ultra-Narrow Bezel Fixation
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Solution Overview
Problem
Existing on-vehicle display module backlight modules face challenges in achieving an ultra-narrow bezel while ensuring reliable fixation of film layers and preventing bright spots that affect picture quality.
Innovation Solution
The proposed backlight module design includes a backplate with side plates forming an accommodating space, where a light guide plate and optical film layer are stacked. The light guide plate features limiting portions located in the bezel area, which extend beyond the edge of the backplate to securely position the optical film layer, thereby minimizing bezel width and avoiding bright spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the bezel width is reduced to achieve an ultra-narrow bezel design, then the aesthetic appearance and modernity of the display module is improved, but the reliability of film layer fixation deteriorates due to insufficient space for proper fixing structures
Solution Approach 1:
The first limiting portion extends in the thickness direction of the light guide plate, utilizing the Z-dimension to provide fixation functionality. This vertical extension allows the limiting portion to protrude from the side surface of the light guide plate, creating an effective fixing structure within the constrained lateral space of the ultra-narrow bezel design.
Solution Approach 2:
The light guide plate is divided into a main body portion and a separate first limiting portion. This segmentation allows the limiting portion to be positioned strategically at the side surface of the light guide plate, providing dedicated fixation functionality for the optical film layer while maintaining the overall compact structure required for ultra-narrow bezel design.
2Shape
If the bezel width is reduced to less than 4 mm, then the display module meets customer expectations for narrow bezels, but the difficulty of designing and implementing effective film layer fixation increases significantly
Solution Approach 1:
The first limiting portion is integrated as an inherent structural feature of the light guide plate itself, rather than being a separate component. This merging of functions allows the light guide plate to simultaneously serve its light-guiding purpose and provide fixation capability through the extended limiting portion, simplifying the overall structure while achieving ultra-narrow bezel design.
3Reliability
If the first limiting portion is positioned at the side surface of the light guide plate, then the optical film layer can be securely fixed, but the structure requires careful positioning to avoid bright spots that affect picture quality
Solution Approach 1:
The first limiting portion is strategically positioned at the side surface of the light guide plate, specifically in the bezel area away from the display area. This localized positioning provides necessary fixation capability while avoiding the display region, thereby preventing bright spots and maintaining picture quality. The limiting portion's position is optimized to balance fixation reliability with optical performance.
Data Source
AI summary
Provided is a backlight module, including: a backplate, a light guide plate and an optical film layer. The backplate includes a bottom plate and side plates. The bottom plate and the side plates forms an accommodating space. The light guide plate and the optical film layer are sequentially stacked on the bottom plate in the accommodating space. The backlight module includes a display area and a bezel area. The light guide plate includes a main body portion and a first limiting portion arranged on a side, facing the optical film layer, of the main body portion, at least part of the first limiting portion is located in the bezel area, the first limiting portion limits a position of the optical film layer; an orthographic projection of the first limiting portion on the bottom plate is at least partially located outside a side edge of the bottom plate.