LCD Cover Bottom with Integrated Cable FPCB
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Solution Overview
Problem
Conventional liquid crystal display devices face high assembly tolerance and low productivity due to complex electrical connections and the use of additional components like adhesive tapes for fixing reflective plates, leading to potential disconnection defects and decreased assembly accuracy.
Innovation Solution
The design incorporates a cover bottom with a polygonal shape and holes for integrating an LED flexible printed circuit board and a cable FPCB, eliminating the need for separate wiring or soldering and fixing processes, with a reflective plate aligned to enhance assembly accuracy and reduce material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate flexible cable is used to electrically connect the LED driving circuit and LED PCB through soldering, then electrical connection is achieved, but assembly tolerance increases and productivity decreases
Solution Approach 1:
The patent merges the cable FPCB with the LED FPCB by making them integrally formed as a single piece. This eliminates the need for separate soldering operations and reduces assembly steps, thereby improving productivity while maintaining reliable electrical connections between the LED driving circuit and LEDs.
2Stability of the object's composition
If adhesive tape is used to fix the reflective plate to the cover bottom, then the reflective plate is secured, but assembly tolerance increases and material cost increases
Solution Approach 1:
The patent extracts and eliminates the adhesive tape from the assembly process. Instead of using adhesive tape to fix the reflective plate, the design allows the cable FPCB to pass through a pre-formed hole in the reflective plate, which is then inserted through a hole in the cover bottom. This mechanical positioning method provides more precise alignment and eliminates the need for additional adhesive materials.
3Illumination intensity
If the reflective plate is placed at a distance from the LED to reflect light, then light reflection is achieved, but the pitch of white uniformity is remarkably lowered
Solution Approach 1:
The patent utilizes the vertical dimension by forming the reflective plate with a height that extends from the bottom surface of the cover bottom to a position closer to the LEDs. This three-dimensional configuration allows the reflective surface to be positioned optimally for light reflection while maintaining compact pitch and achieving good white uniformity across the display 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 configuration simplifies the assembly process, enhances durability, and improves assembly accuracy by eliminating the need for separate wiring and fixing processes, thereby increasing productivity and reducing defects.
Implementation Method 1
a reflective plate provided with a second hole formed at a position corresponding to the first hole, the reflective plate being disposed on an upper surface of the first bottom surface
Data Source
AI summary
A liquid crystal display device includes a cover bottom including a first bottom surface in a polygonal shape, a first side formed upward from each edge of the first bottom surface, and a first hole formed at the bottom surface, the first side, or the edge; an LED FPCB disposed at an inner surface of the first side; multiple LEDs mounted on the LED FPCB; a reflective plate provided with a second hole formed at a position corresponding to the first hole, the reflective plate being disposed on an upper surface of the first bottom surface; and a cable FPCB provided with a first end extending from one side of the LED FPCB to transmit power or a driving signal from outside, to the LED FPCB, and provided with a second end penetrating through the first hole and the second hole and being disposed outside the cover bottom.