Perpendicular Circuit Board Backlight Module for Screen-to-Body Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing backlight modules in portable terminals have a large area for the flexible printed circuit (FPC) and shielding light tape, resulting in a small light-emitting region-to-backlight module ratio, which limits the screen-to-body ratio of portable devices.
Innovation Solution
A backlight module design where the circuit board is perpendicular to the light guide plate and located on the side of the light source away from the guide plate, using a narrower target shielding light tape to cover the circuit board and light source, along with a heat-conducting housing for effective heat dissipation, and additional shielding elements like auxiliary and back shielding tapes to enhance light containment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the FPC is parallel to the light guide plate with large area, then the welding connection is stable, but the shielding light tape area increases and light-emitting region ratio decreases
Solution Approach 1:
The circuit board is rotated from a parallel arrangement to a perpendicular arrangement relative to the light guide plate, changing the spatial dimension of connection. This dimensional change allows the circuit board to extend in the thickness direction rather than the planar direction, significantly reducing the shielding light tape area while maintaining welding stability through the perpendicular mounting configuration.
2Object-affected harmful factors
If the shielding light tape area is large, then light shielding is effective, but the light-emitting region to backlight module ratio is small
Solution Approach 1:
By rotating the circuit board perpendicular to the light guide plate, the shielding light tape is repositioned from a large planar area to a smaller area along the thickness direction. This dimensional change maintains effective light shielding for the circuit board and light source while significantly increasing the light-emitting region ratio in the display plane.
3Area of stationary object
If the circuit board is perpendicular to the light guide plate, then the shielding light tape area is reduced, but the heat dissipation requirement increases
Solution Approach 1:
A heat dissipation member is introduced as an intermediary component between the circuit board and the backlight module structure. This heat dissipation member receives thermal energy from the LED and circuit board through thermal conduction and dissipates it to the surrounding environment, effectively managing the heat generated by the perpendicular circuit board configuration without compromising the reduced shielding light tape area.
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 light-emitting region-to-backlight module ratio, improving the screen-to-body ratio of portable terminals and enhancing heat dissipation while maintaining effective light shielding.
Implementation Method 1
a heat-conducting housing for effective heat dissipation
Data Source
Figure 1~2
Figure 3~4
AI summary
There is provided a backlight module and a display device. A circle in which a light-emitting region of the backlight module falls has a diameter less than or equal to 7 inches (177.8 mm). The backlight module includes a light source, a circuit board, a light guide plate and a target shielding light tape. The light source is disposed on a side surface of the light guide plate, a light-emitting side of the light source is next to the light guide plate, another side of the light source is welded with the circuit board being perpendicular to the light guide plate, and the target shielding light tape is located on a light-exiting surface of the light guide plate and covers the light source. The target shielding light tape is narrower, and the ratio of light-emitting region to the backlight module is larger, thereby improving the screen-to-body ratio of the portable terminal.