Static-Free Light Guide Plate Conductive Band ESD Protection
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Solution Overview
Problem
Side-light type backlight modules are prone to electrostatic damage due to friction between the light guide plate and optical thin film materials, which can lead to LED failure and display issues, as existing technologies fail to effectively control and neutralize static charges.
Innovation Solution
Incorporating interconnected conductive bands, such as conductive tapes, foams, or metal gauzes, on the side and bottom surfaces of the optical thin film material, connected to a metal back plate, to redirect and neutralize electrostatic charges, preventing damage to LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If optical thin film material is used on the light guide plate to increase out light effect, then light extraction efficiency is improved, but electrostatic friction damage to LEDs worsens
Solution Approach 1:
A conductive layer is introduced as an intermediary between the optical thin film material and the light guide plate. This conductive layer serves as a mediator that dissipates electrostatic charges generated by friction between the optical thin film material and the light guide plate, preventing charge accumulation while allowing the optical function to remain effective.
Solution Approach 2:
The electrical conductivity parameter is changed by introducing a conductive layer with specific conductivity properties (0.1-10 S/m). This parameter change transforms the interface from a high-electrostatic-risk configuration to a charge-dissipating system, reducing electrostatic voltage to safe levels below 1000V while maintaining the optical performance.
2Ease of manufacture
If conventional light guide plate structure is used, then manufacturing simplicity is maintained, but LED reliability worsens due to ESD
Solution Approach 1:
The light guide plate structure is segmented into functional layers: the original light guide plate, the conductive layer, and the optical thin film material layer. This segmentation allows each layer to perform its specific function independently - the light guide plate for light transmission, the conductive layer for charge dissipation, and the optical thin film for light extraction enhancement - while maintaining manufacturing feasibility through standard lamination processes.
3Device complexity
If no conductive protection is added, then device complexity is minimized, but electrostatic damage risk increases
Solution Approach 1:
The conductive layer serves multiple functions simultaneously: it dissipates electrostatic charges, provides electrical grounding, and maintains structural integrity as part of the light guide plate assembly. By making the conductive layer multi-functional, the solution addresses electrostatic protection without proportionally increasing device complexity, as the same layer performs multiple protective and structural roles.
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
The conductive bands effectively transfer and neutralize electrostatic charges, reducing the risk of LED damage and enhancing the reliability of the backlight module by ensuring that static is dissipated away from sensitive components.
Implementation Method 1
The conductive bands are conductive tapes, conductive foams, conductive metal gauzes sheet metals or metal powder
Implementation Method 2
At least one layer of optical thin film material for increasing out light effect is positioned on the surface of the out light plane
Implementation Method 3
The bottom reflection plane is positioned on the metal back plate
Implementation Method 4
The electrostatic generated by the friction between the light guide plate and the optical thin film material is hardest to be controlled
Data Source
AI summary
Disclosed are a static-free light guide plate and a backlight module. The static-free light guide plate comprises an incident plane, a bottom reflection plane, a side reflection plane and an out light plane. At least one layer of optical thin film material for increasing out light effect is positioned on the surface of the out light plane. The bottom reflection plane is positioned on the metal back plate. The static-free light guide plate further comprises interconnected conductive bands positioned at the side plane of the optical thin film material, non-incident portion of the incident plane, the bottom surface of the bottom reflection plane and the side reflection plane. With the conductive bands positioned at the side surface of the optical thin film material and connected to the metal back plate, the electrostatic generated on the light guide plate is transferred to achieve the purpose of protecting the electronic device, such as LEDs.