Display Backlight Antistatic Pad Structure for Dense LED ESD Protection
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Solution Overview
Problem
The increasing number of light sources in display apparatuses to improve contrast ratio leads to a narrower area for LEDs and Zener diodes, making them more susceptible to damage from static electricity, which existing electrostatic discharge protection circuits struggle to manage effectively.
Innovation Solution
A display apparatus design that omits Zener diodes from light emitting diodes and incorporates an antistatic member, including an antistatic pad and insulating dome, to protect light sources from static electricity without increasing the area occupied by each light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of light sources is increased to improve contrast ratio, then the display quality is improved, but the area assigned to each light source becomes narrow and susceptibility to static electricity damage increases
Solution Approach 1:
The patent extracts the Zener diode from the light source module, separating the electrostatic protection function from the light emitting structure. This allows the light source area to be minimized for high contrast ratio while the extracted protection pad provides dedicated ESD protection without occupying light source space.
Solution Approach 2:
The patent introduces an intermediary protection pad structure that mediates between the light source and the substrate. This pad acts as a buffer zone that captures and dissipates static electricity before it reaches the light emitting diode, enabling compact light source design with maintained reliability.
2Reliability
If Zener diodes are included in each light emitting diode for electrostatic protection, then the reliability against static electricity is improved, but the area occupied by each light source increases
Solution Approach 1:
The protection pad is extracted from the light source structure and placed as a separate element on the substrate. This extraction allows the light emitting diode to occupy minimal area while the dedicated protection pad provides ESD protection in an adjacent location, resolving the area-reliability contradiction.
Solution Approach 2:
The patent segments the light source system into distinct functional zones: the light emitting diode area and the electrostatic protection pad area. This segmentation allows independent optimization of each component's size and function, enabling compact overall design with adequate protection.
3Illumination intensity
If the area of light sources is reduced to increase the number of light sources, then the contrast ratio is improved, but the light sources become more susceptible to static electricity damage
Solution Approach 1:
The protection pad serves as an intermediary element positioned between the compact light source and the substrate. It intercepts static electricity that would otherwise reach the small, vulnerable light emitting diode, enabling miniaturization without increasing susceptibility to harmful factors.
Solution Approach 2:
The protection pad provides beforehand cushioning by being positioned to intercept static electricity before it can reach the light source. This preventive structure cushions the compact light emitting diode against ESD damage, allowing area reduction without compromising reliability.
Data Source
AI summary
Provided is a display apparatus including: a liquid crystal panel; a substrate; a light source module disposed on the substrate. The light source module includes a light emitting diode disposed on the substrate, a feed pad provided on the substrate, an antistatic pad provided on the substrate; and an insulating dome provided on the substrate and covering the light emitting diode. The antistatic pad is divided into two parts by an outline of the insulating dome.