Display Apparatus Static Discharge Circuit
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Solution Overview
Problem
Liquid crystal displays (LCDs) are prone to damage from high-voltage static electricity, which induces damage to internal driving chips and other circuit devices due to their nonmetallic construction, leading to potential failures.
Innovation Solution
Incorporation of a discharge circuit on the printed circuit board to rapidly discharge high-voltage static electricity introduced into the data driving unit towards a receptacle, preventing damage to the data driving unit and ensuring that static electricity does not reach the control board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a liquid crystal display panel uses nonmetallic materials for its construction, then the panel can achieve slimness and light weight, but static electricity is induced to the panel causing damage to internal driving chips
Solution Approach 1:
A discharge circuit is introduced as an intermediary component between the data driving unit and the external environment. The circuit includes a discharge node connected to the data driving unit and a discharge element (such as a resistor or varistor) that provides a controlled path for static electricity to dissipate safely, preventing direct damage to the driving chip while maintaining the nonmetallic slim structure of the display panel
2Reliability
If the display panel is entirely shielded by metal case, then protection from static electricity is improved, but the panel loses its slim and lightweight advantages
Solution Approach 1:
Instead of providing complete metal shielding around the entire display panel, the discharge circuit provides localized protection at critical points where static electricity most commonly enters (through the data driving unit connections). This selective protection approach maintains the overall slim and lightweight design while providing sufficient protection against static electricity damage
3Reliability
If static electricity is discharged through the data driving unit, then the data driving unit is protected from damage, but the discharge circuit complexity increases
Solution Approach 1:
The discharge circuit is segmented into simple, modular components: a discharge node connected to the data driving unit input terminals and discharge elements (resistors or varistors) connected between the discharge node and ground. This segmentation allows the protection function to be added as a simple supplement to the existing circuit architecture without significantly increasing overall system complexity
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 discharge circuit effectively protects the data driving unit from high-voltage static electricity, preventing damage and ensuring the integrity of internal circuit devices within the display apparatus.
Implementation Method 1
a discharge circuit that outputs the first and second driving signals to the data driving unit and discharges static electricity introduced into the data driving unit toward the receptacle that receives the display module
Data Source
AI summary
A display apparatus includes a display panel that displays an image in response to a data voltage, a data driving unit that outputs the data voltage in response to a driving signal, and a printed circuit board that outputs the driving signal and that has a static electricity discharge circuit. The discharge circuit discharges high-voltage static electricity, which is introduced into the data driving unit, to ground. Accordingly, the display apparatus prevents the data driving unit from being damaged by the high-voltage static electricity.