Backlight Source Notch ESD Protection via Series LED Segmentation
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Solution Overview
Problem
The existing backlight structures in display devices are vulnerable to electrostatic discharge (ESD) damage due to unprotected perforated positions, which can lead to static electricity directly affecting the LED light-emitting elements, causing damage during the ESD test.
Innovation Solution
A backlight source design featuring a metal frame with a notch for the light bar, where the light-emitting elements are arranged in series-connected groups, allowing electrostatic energy to disperse through the entire series-connected first light-emitting group, preventing any single element from being subjected to electrostatic energy alone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the metal frame is perforated to allow oblique insertion of the light bar, then the assembly ease is improved, but the electrostatic discharge protection deteriorates
Solution Approach 1:
The light-emitting element group is segmented into multiple series-connected elements. When static electricity enters through the notch, the electrostatic current is distributed across multiple series-connected LED elements rather than concentrating on a single element, reducing the risk of complete failure
Solution Approach 2:
The patent converts the harmful effect of electrostatic discharge into a beneficial outcome by designing the circuit so that static electricity entering through the unprotected notch flows through multiple series-connected LED elements. This distributes the electrostatic energy across multiple components, and the series connection ensures that the electrostatic current must pass through each element, effectively using the harmful static discharge path to verify and distribute energy safely across the light-emitting group
2Object-affected harmful factors
If edge-covering mylar is used to wrap the perforated position, then the electrostatic discharge protection is improved, but the manufacturing precision and assembly quality deteriorate due to incomplete sealing
Solution Approach 1:
The patent extracts the critical light-emitting element group and places it in a series connection configuration that inherently protects against electrostatic damage. Rather than relying on the mylar wrapping to completely seal the notch (which requires high manufacturing precision), the design allows static electricity to enter but directs it through a protected series-connected circuit path
Solution Approach 2:
The series connection of multiple LED elements provides beforehand cushioning against electrostatic damage. Even if static electricity enters through the imperfectly sealed notch, the distributed series connection acts as a protective mechanism that prevents any single element from bearing the full electrostatic burden, cushioning the system against complete failure
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 effectively disperses electrostatic energy across the series-connected light-emitting elements, preventing damage from electrostatic discharge and enhancing the reliability of the backlight source.
Implementation Method 1
During the electro-static discharge (ESD) test, because the perforated position is unprotected, static electricity can directly act on pins of the LED, resulting in LED damage
Data Source
AI summary
The disclosure relates to the technical field of backlight structures, and discloses a backlight source and a display device. The backlight source includes a light bar and a metal frame; the side, containing the light bar, of the metal frame has a notch; the light bar includes a light-emitting unit; the light-emitting unit includes a plurality of light-emitting groups; each light-emitting group includes at least one first light-emitting group and at least one second light-emitting group, the first light-emitting group includes N light-emitting elements, the light-emitting element numbered n is connected in series with the light-emitting element numbered n+1 successively, the light-emitting element numbered 1 and the light-emitting element numbered N are arranged adjacently, and the light-emitting element numbered 1 and the light-emitting element numbered 2 are the farthest apart.