LED Light Source Module With Antistatic Pads for Dense Display Backlights
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Solution Overview
Problem
Display apparatuses face damage to light sources due to static electricity, especially when increasing the number of light sources to improve contrast ratio reduces the area allocated to static electricity protection circuits like Zener diodes.
Innovation Solution
The display apparatus includes light sources without Zener diodes and incorporates an antistatic member with silver-plated surfaces to prevent static electricity damage, featuring a reflective sheet with holes and antistatic pads extending along feeding lines, connected to the ground for electrostatic discharge protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of light sources is increased to improve contrast ratio, then the contrast ratio is improved, but the area allocated to static electricity protection circuits is reduced
Solution Approach 1:
The patent extracts the static electricity protection function from the traditional Zener diode circuit and relocates it to a separate antistatic member. This allows the protection function to be maintained while freeing up space on the substrate, enabling increased light source density without proportionally increasing the area occupied by protection circuits.
Solution Approach 2:
The antistatic member serves multiple functions: it provides static electricity protection for multiple light sources simultaneously, acts as a ground reference, and can be configured to protect specific regions. This multi-functional approach allows a single component to replace what would traditionally require multiple discrete protection circuits.
2Reliability
If Zener diodes are used for static electricity protection, then damage to light sources is prevented, but the device complexity and area increase
Solution Approach 1:
The protection function is extracted from the light source circuitry and implemented as a separate antistatic member with silver plating. This separation simplifies the overall device architecture by eliminating the need for complex Zener diode circuits while maintaining reliable static electricity protection.
Solution Approach 2:
The patent changes the protection mechanism from active circuitry (Zener diodes with specific voltage breakdown characteristics) to a passive electromagnetic shielding approach using conductive silver plating. This parameter change from active to passive protection reduces circuit complexity while maintaining reliability.
3Reliability
If metal surfaces are used in the light source module, then electrical conductivity is achieved, but oxidation reduces storage reliability
Solution Approach 1:
The patent uses a composite structure combining a base metal layer with a silver plating layer. The silver layer serves as a protective barrier that prevents oxidation of the underlying metal while maintaining excellent electrical conductivity. This composite material approach solves both the conductivity and oxidation resistance requirements.
Solution Approach 2:
The silver plating creates an inert-protected environment for the underlying metal by forming a stable, non-reactive outer layer. This protective barrier prevents direct contact between oxygen and the reactive metal substrate, effectively creating a localized inert environment that prevents oxidation.
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 suppresses static electricity damage, enhances luminance, and improves storage reliability by reducing oxidation of metal surfaces, thus maintaining the integrity and performance of the light sources.
Implementation Method 1
an upper surface of which is plated with silver (Ag)
Implementation Method 2
an antistatic member that may be disposed near a plurality of light sources which may result in a suppression or prevention of damage to the light sources due to static electricity
Data Source
AI summary
A light source device includes: a reflective sheet including a hole formed therein; and a light source module including a portion inserted into the hole, a substrate including a first layer including a feeding line, and a second layer laminated in an upper portion of the first layer, a light-emitting diode on the second layer, a feeding pad, connected to the feeding line, in a window formed in the second layer and configured to contact the light-emitting diode, an insulating dome on the second layer, and an antistatic pad on the second layer and including a silver plating layer, a first antistatic pad within a region defined by the hole, and a second antistatic pad outside of the region defined by the hole and extending in the longitudinal direction of the feeding line spaced a first length therefrom in the width direction of the feeding line.