LCD Over-Current Protection Circuit Prevents Substrate Burnout
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) with gate drivers on array (GOA) substrates are prone to burnout due to short circuits caused by vapor seepage, leading to substrate failure.
Innovation Solution
Incorporation of an over-current protection circuit that outputs an adjusting signal to the controller to turn off the LCD when a clock signal magnitude exceeds a predetermined value, preventing substrate burnout by switching the clock signals and start signal to a floating state or a constant voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If gate drivers are fabricated on array (GOA) to produce LCD with narrow border, then the border width is reduced, but the substrate becomes vulnerable to burnout from vapor seepage causing short circuits
Solution Approach 1:
The patent applies preliminary anti-action by introducing an over-current protection circuit that detects short circuit conditions before they cause substrate burnout. The protection circuit proactively monitors current levels and preemptively shuts down the GOA unit when abnormal current is detected, preventing the harmful effect of vapor-induced short circuits from destroying the substrate.
Solution Approach 2:
The patent converts the harmful short circuit condition into a beneficial protection mechanism. When vapor seepage causes a short circuit, the over-current protection circuit detects the abnormal current and triggers a shutdown, transforming the potential destructive event into a protective action that saves the substrate. The harmful short circuit signal is converted into a useful protection trigger.
2Reliability
If over-current protection circuit is added to prevent substrate burnout, then substrate reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the over-current protection circuit with the existing GOA unit structure, integrating the protection functionality into the gate driver array rather than adding completely separate protection systems. The protection circuit shares the substrate and integrates with the existing clock signal generation and distribution network, reducing the overall complexity increase.
Solution Approach 2:
The over-current protection circuit serves multiple functions: it monitors current levels, detects short circuit conditions, triggers shutdown signals, and protects against vapor seepage effects. This multi-functional design consolidates several protection and monitoring roles into a single circuit module, minimizing the complexity increase while maximizing the reliability improvement.
Data Source
AI summary
An LCD includes a substrate, gate on array (GOA) units connected in series, a controller, a level shifter, and an over-current protection circuit. The substrate includes a pixel array section and a circuit arrangement section. The GOA units are used for outputting a scanning signal to the pixel array section based on voltage levels of clock signals and a voltage level of a start signal. The controller generates the clock signals and the start signal. The level shifter adjusts the voltage levels of the clock signals and the voltage level of the start signal. The over-current protection circuit outputs an adjusting signal to the controller to turn off the LCD when a magnitude of one of the plurality of clock signals is over a predetermined value. Therefore, the LCD is turned off for a while, preventing from being burnt out.