ESD Chip Inspection via LVDS Signal Logic and Display
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Solution Overview
Problem
Existing ESD protection circuits for LVDS driving circuits in TFT-LCDs are ineffective in distinguishing correctly and incorrectly soldered ESD protection chips, leading to shipping defects and increased manufacturing costs due to difficulty in visually identifying abnormal soldering.
Innovation Solution
A digitally displaying inspection system that uses an LVDS connector, a display system, data lines, a power supply, and a resistor to sample signals and display character signs indicating correct or incorrect soldering through a logic operation module and digital display module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ESD protection chip is used in LVDS transmission circuit, then the LVDS data processing chip IC is protected from static electricity damage, but it becomes difficult to visually distinguish correctly soldered from incorrectly soldered chips
Solution Approach 1:
The patent applies a light-emitting element that emits different colors of light depending on the soldering state. When the ESD protection chip is correctly soldered, one color is emitted; when incorrectly soldered, a different color is emitted. This allows visual identification of soldering quality through color changes, directly resolving the contradiction between protection functionality and detectability.
Solution Approach 2:
The patent introduces a light-emitting element as an intermediary indicator between the ESD protection chip and the observer. This intermediary converts the internal electrical state (correct/incorrect soldering) into an externally observable signal (light color), enabling visual detection without exposing the chip structure itself.
2Reliability
If manual inspection of ESD protection chip soldering is performed, then defective products can be identified, but it takes great effort and time increasing manufacture cost
Solution Approach 1:
The patent enables the ESD protection chip to self-indicate its soldering state through the light-emitting element. The chip automatically displays its status without requiring external inspection tools or manual examination, allowing workers to quickly identify defective products at a glance and significantly reducing inspection time and effort.
3Reliability
If ESD protection chip is soldered in reversed manner, then the LVDS signal voltage is distorted causing abnormal image display, but it is hard to identify front and back sides of the chip
Solution Approach 1:
The light-emitting element emits different colors based on the chip's orientation and soldering correctness. This provides immediate visual feedback to operators about whether the chip is installed in the correct orientation, eliminating the difficulty of identifying front and back sides and preventing reversed soldering that would distort LVDS signals.
Data Source
AI summary
The present invention provides a digitally displaying inspection system for ESD protection chip, which includes an LVDS connector, a display system, first, second, and the third data lines, a power supply, and a resistor. The first, second, and third data lines each have an end electrically connected to the LVDS connector and an opposite end electrically connected to the display system. The display system includes a logic operation module and a digital display module electrically connected to the logic operation module. The logic operation module is electrically connected to the first, second, and third data lines. When an ESD protection chip is electrically connected to the LVDS connector, the logic operation module samples signals on the first, second, and third data lines and drive, after carrying out logic operations, the digital display module to display character signs, which can identify if the ESD protection chip is incorrectly connected.