LED Electrodes with Branches for Backlight Luminance
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Solution Overview
Problem
Conventional liquid crystal display backlight modules using cold cathode fluorescent lamps have high power consumption, and light emitting diodes (LEDs) with electrodes that are not properly aligned with the flexible printed circuit board result in reduced luminance due to gaps between electrodes and solder pads, leading to inefficient light entry into the light guide plate.
Innovation Solution
The design of light emitting diodes with electrodes featuring a main body and branches that form accommodation spaces for solder material, ensuring direct contact and minimizing gaps, thereby enhancing light emission into the light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional light emitting diodes with straight electrodes are used, then the structure is simple, but gaps form between electrodes and solder pads reducing light emission efficiency
Solution Approach 1:
The electrode is segmented into a main body and multiple branches extending in different directions. This segmentation allows the electrode to contact multiple solder pads simultaneously, eliminating gaps and improving light emission efficiency while maintaining reasonable structural complexity
Solution Approach 2:
The branch structure is nested within the overall electrode configuration, with branches extending from the main body to reach additional solder pads. This nested arrangement maximizes contact area without significantly increasing overall device complexity
2Illumination intensity
If electrodes are positioned farther from the flexible printed circuit board, then manufacturing is easier, but luminance decreases due to increased gaps
Solution Approach 1:
By segmenting the electrode into branches, the invention enables the electrode to maintain close proximity to the flexible printed circuit board while still being manufacturable. The branches can be precisely positioned to contact solder pads, ensuring high luminance without compromising manufacturing ease
Solution Approach 2:
The electrode geometry parameters are changed from straight lines to branched structures with specific extension directions. This parameter change allows optimization of both position relative to the circuit board and contact with solder pads, achieving high luminance while maintaining manufacturing feasibility
3Illumination intensity
If solder material covers solder pad areas, then electrical connection is formed, but gaps are created between solder pads and electrodes reducing light entry
Solution Approach 1:
The branched electrode structure is designed to contact multiple solder pads through different branches, ensuring that even if solder material creates gaps in some areas, electrical connectivity is maintained through alternative branch paths, while light entry efficiency is improved through optimized electrode positioning
4Reliability
If light emission portion is above the light emission surface, then electrode contact is improved, but module thickness increases
Solution Approach 1:
Instead of positioning the light emission portion above the light emission surface (vertical dimension), the invention uses branched electrodes to achieve reliable contact in the horizontal plane. This dimensional shift maintains electrode contact reliability while avoiding increased module thickness
Data Source
AI summary
An exemplary light emitting diode (23) includes a package body (231) and two electrodes (233) attached to the package body. Each of the electrodes includes a main body and a plurality of branches extending from the main body. The branches of each electrode together with a corresponding portion of the main body cooperatively define an accommodation space therebetween.