LCD Bezel Narrowing via Graphite Film and PCB Protrusions
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Solution Overview
Problem
Existing liquid crystal display devices (LCDs) face challenges in implementing a narrow bezel due to the limitations of the guide mold's width and the optical distance between LEDs, which are constrained by the wiring design and attachment characteristics of the printed circuit board (PCB) and guide mold.
Innovation Solution
The implementation of a graphite film that surrounds the LED assembly and reflection plate, coupled with an adhesive member, allows for the removal of the guide mold from the light-incident portion, reducing the bezel width and providing effective heat dissipation and light blocking properties, while stabilizing the positional alignment of LEDs and the light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guide mold is used to fix the LED assembly, then the LED assembly is stably supported, but the bezel width is increased
Solution Approach 1:
The guide mold is extracted from the light-incident portion where it would increase bezel width, while its fixing function is transferred to the PCB through protrusions that extend into spaces between adjacent LEDs, maintaining LED assembly stability without the bezel width penalty
Solution Approach 2:
The protrusions on the PCB act as intermediaries to transfer the fixing function from the guide mold to the LED assembly, allowing the PCB to directly support the LEDs through mechanical engagement without requiring a separate guide mold structure in the light-incident area
2Length of moving object
If the distance between LEDs is reduced, then the optical distance is reduced, but the wiring design and attachment characteristics become more difficult
Solution Approach 1:
The PCB is segmented with multiple protrusions positioned at specific locations corresponding to spaces between adjacent LEDs, allowing each protrusion to independently engage with LED assemblies and provide localized fixing points that accommodate reduced LED spacing
Solution Approach 2:
The fixing mechanism transitions from a planar guide mold structure to a three-dimensional protrusion structure that extends vertically from the PCB surface, enabling mechanical engagement with LED assemblies in the vertical dimension while maintaining reduced horizontal spacing between LEDs
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 enables a significant reduction in the bezel area, allowing for a narrower bezel implementation, improved heat dissipation, and enhanced backlight characteristics by expanding the light incident angle and reducing the optical distance.
Implementation Method 1
a graphite film configured to surround an upper surface and an outer side surface of the LED assembly and a lower surface of the reflection plate
Implementation Method 2
The implementation of a graphite film that surrounds the LED assembly and reflection plate, coupled with an adhesive member, allows for the removal of the guide mold from the light-incident portion, reducing the bezel width and providing effective heat dissipation and light blocking properties
Data Source
AI summary
An LCD includes: a liquid crystal panel; a light guide plate disposed under a liquid crystal panel; a reflection plate under the light guide plate; a light emitting diode (LED) assembly including an LED facing a light incidence surface of the light guide plate and a printed circuit board (PCB) mounted on a lower surface of the LED; and a graphite film configured to surround an upper surface and an outer side surface of the LED assembly and a lower surface of the reflection plate.