LCDM Bottom Frame Segmentation for FPCB Routing
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Solution Overview
Problem
The existing liquid crystal display module (LCDM) production process is hindered by increased costs and time due to the need for mold changes when adjusting the position of the exterior circuit connection part, leading to inefficiencies and potential light loss from the backlight unit.
Innovation Solution
The LCDM design includes a light guide plate with a reflective sheet and a flexible printed circuit board (FPCB) where the exterior circuit connection lead passes between the light guide plate and the bottom frame, eliminating the need for a hole in the bottom frame, thus simplifying the manufacturing process and reducing light loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the exterior circuit connection part position is adjusted in the related art LCDM, then the circuit connection can be optimized, but mold changes are required which increases production costs and time
Solution Approach 1:
The bottom frame is divided into a frame body and a separate cover member that can be detachably coupled. The exterior circuit connection part is integrated into the cover member, allowing the cover member to be independently removed or repositioned without requiring mold changes to the entire bottom frame. This segmentation enables flexible circuit connection positioning while maintaining simple manufacturing processes.
2Ease of operation
If a hole is made in the bottom frame for the FPCB to pass through, then the circuit connection is enabled, but light loss occurs from the backlight unit
Solution Approach 1:
The exterior circuit connection part is extracted from the main frame body and integrated into a separate cover member. This allows the FPCB to pass through the cover member rather than the main frame body, positioning the opening away from the backlight unit's light path and thereby reducing light loss while still enabling circuit board installation.
3Ease of manufacture
If the bottom frame is made as a single integrated piece, then manufacturing is simplified, but flexibility in FPCB routing is reduced
Solution Approach 1:
The bottom frame is segmented into a frame body and a cover member that can be detachably coupled. This segmentation provides flexible FPCB routing options as the cover member can be positioned or removed to accommodate different FPCB layouts, while each segment remains simple to manufacture using standard molding processes.
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 simplifies the production process, reduces production costs, and minimizes light loss by allowing for flexible placement of the FPCB without the need for mold changes, enhancing the overall efficiency and assembly of the LCDM.
Implementation Method 1
a reflective sheet having a front side on the rear surface of the light guide plate for reflecting light into the light guide plate
Data Source
AI summary
A liquid crystal display module, includes: a light guide plate having a side surface, a rear surface and a top surface opposite to the rear surface; a reflective sheet having a front side on the rear surface of the light guide plate for reflecting light into the light guide plate and also having a rear side opposite to the front side; a lead connected to a light emitting diode lamp adjacent to the light guide plate; and a bottom frame surrounding the side surface of the light guide plate and covering edges of a rear surface of the light guide plate such that a center of the rear side of the reflective sheet is exposed in an opening of the bottom frame, wherein the lead passes through the opening in the bottom frame such that an end of the lead is disposed outside of the bottom frame.