Backlight Module Mounting Groove for LCD Frame Width Reduction
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices have a low screen-to-body ratio due to the need for structures to carry the light source between the back plate and the light guide plate, which increases the frame width and complicates manufacturing.
Innovation Solution
A backlight module design featuring a back plate with a mounting groove at one end, where the light source is arranged within the groove, allowing its emergent surface to face the light guide plate's incident surface, eliminating the need for additional light source carrying structures and reducing the frame width by minimizing the distance between the back plate and light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional structures are added to carry the light source between the back plate and light guide plate, then the light source can be supported, but the frame width increases and the screen-to-body ratio decreases
Solution Approach 1:
The mounting groove is directly formed on the back plate, merging the light source mounting function into the back plate structure itself. This eliminates the need for separate carrying structures between the back plate and light guide plate, thereby reducing frame width while maintaining light source support capability
Solution Approach 2:
The light source is mounted on the rear surface of the back plate in a dimension perpendicular to the light propagation direction. This dimensional repositioning allows the light source to be supported without extending the frame width in the horizontal plane, thus increasing the screen-to-body ratio
2Reliability
If additional carrying structures are added for the light source, then the light source can be positioned, but the manufacturing process becomes more complex
Solution Approach 1:
The mounting groove is integrated directly into the back plate structure, combining the positioning and support functions into a single structural feature. This eliminates the need for separate carrying components and simplifies the manufacturing process while ensuring accurate light source positioning
Solution Approach 2:
The complex carrying structures are extracted and removed from the design. Instead, a simple mounting groove is created on the back plate, which achieves the necessary positioning function with minimal structural complexity, thereby simplifying manufacturing
3Length of stationary object
If the distance between the back plate and light guide plate is reduced, then the frame width decreases, but the light source mounting becomes more difficult
Solution Approach 1:
The light source is mounted on the rear surface of the back plate in a dimension perpendicular to the light propagation direction. This allows the light source to be positioned close to the light guide plate (reducing frame width) while maintaining easy access for mounting operations from the rear side
Solution Approach 2:
The mounting groove is pre-formed on the back plate during back plate manufacturing, before the light source installation. This preliminary preparation of the mounting structure simplifies the subsequent light source installation process, making it easy to perform even when the overall frame width is reduced
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
This design increases the screen-to-body ratio of the LCD device, simplifies the manufacturing process, enhances light utilization efficiency, and reduces light consumption by using COB packaged LEDs and additional components like light shielding and reflective films.
Implementation Method 1
the light source includes chip-on-board packaged light emitting diodes
Implementation Method 2
a light emergent surface of the light source faces a light incident surface of the light guide plate
Implementation Method 3
the backlight module further includes a reflective film disposed between the back plate and the light guide plate, and a reflective surface of the reflective film faces the light guide plate
Implementation Method 4
the backlight module further includes a light shielding member, and the light shielding member is disposed at one side of the light emitting device away from the support member
Data Source
AI summary
The present disclosure provides a backlight module and a liquid crystal display device, and the backlight module includes a back plate, a light guide plate and a light source. The back plate and the light guide plate are laminated. The back plate includes a mounting groove disposed at a first end of the back plate. The light source is arranged in the mounting groove. A light emergent surface of the light source faces a light incident surface of the light guide plate.