Backlight Module Light Source Mounting Holes
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Solution Overview
Problem
The existing LED backlight modules face issues with poor backlight brightness and uniformity due to gaps generated between the light emitting surface of the LED and the light incident surface of the light guide plate during the reflow soldering process, leading to inefficient light distribution.
Innovation Solution
The proposed solution involves a backlight module design with light source mounting holes on the light guide plate, where the light source is directly attached to the hole wall, and anode-cathode conductive parts on the flexible circuit board connect to the light source, ensuring proper alignment and power supply, eliminating the need for reflow soldering and preventing light loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reflow soldering process is used to attach LED to flexible circuit board, then electrical connection is achieved, but light source position deviates from preset position causing gaps between light emitting surface and light guide plate
Solution Approach 1:
The attachment process is segmented into two independent stages: first attaching the light source to the light guide plate, then separately attaching the flexible circuit board to the light guide plate. This segmentation prevents the high-temperature reflow soldering from affecting the light source position, while still achieving reliable electrical connection through the separate board attachment process.
Solution Approach 2:
The light source is preliminarily attached to the light guide plate before the flexible circuit board is attached. This preliminary action ensures that the light source is in the correct position and securely fixed to the light guide plate before any electrical connection components are added, preventing position deviation during the overall assembly process.
2Ease of manufacture
If gap is generated between light emitting surface of LED and light incident surface of light guide plate, then assembly flexibility is improved, but backlight brightness and uniformity deteriorate
Solution Approach 1:
The light source attachment structure and the light guide plate are merged into a single integrated assembly where the light source is directly fixed to the light guide plate. This merging eliminates the gap between the light emitting surface and light incident surface, ensuring optimal light transmission while maintaining assembly flexibility through the modular design of the integrated unit.
3Area of stationary object
If multiple light sources are arranged on flexible circuit board, then coverage area is increased, but alignment precision with light guide plate deteriorates
Solution Approach 1:
The alignment process is segmented by attaching the flexible circuit board separately after the light sources are positioned on the light guide plate. This allows each light source to be precisely aligned with its corresponding light guide plate region independently, while still covering a large overall area through the extended flexible circuit board configuration.
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 ensures uniform light distribution and improved brightness by directly attaching the light source to the light guide plate, preventing deviations and simplifying the assembly process, thus enhancing the overall backlight performance.
Implementation Method 1
a light source is mounted in every light source mounting hole, and a light emitting surface of the light source is attached onto a hole wall of the light source mounting hole
Implementation Method 2
the light emitted by the light source will directly enter the light guide plate
Implementation Method 3
plural groups of anode-cathode conductive parts are disposed on the flexible circuit board in one-to-one correspondence with the plural light source mounting holes, and every group of anode-cathode conductive part is connected to an anode and a cathode of the light source
Data Source
AI summary
A backlight module, including a light guide plate and a flexible circuit board, wherein an edge of the light guide plate is provided with plural light source mounting holes disposed along a thickness direction of the light guide plate; a light source is mounted in every light source mounting hole in such a manner that a light emitting surface of the light source is attached onto a hole wall of the light source mounting hole; plural groups of anode-cathode conductive parts are disposed on the flexible circuit board in one-to-one correspondence with the plural light source mounting holes, each being connected to an anode and a cathode of the light source in a corresponding light source mounting hole. The backlight module improves the brightness and uniformity of the light entering the light guide plate. A liquid display device including the above-mentioned backlight module is further provided.