Display Driver Protection Circuit for ESD Voltage Surge Mitigation
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Solution Overview
Problem
Electro-static discharging (ESD) in electronic devices can introduce external charges into display driver integrated circuits, leading to increased voltage in the power supply, potentially damaging amplifiers in the data driver.
Innovation Solution
An electronic device with a display panel and a display driver integrated circuit that includes a source driver with a protection circuit connected between the power supply and ground, which discharges external charges to prevent them from reaching the amplifiers, thereby maintaining a stable voltage and protecting the amplifiers from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electro-static discharging occurs, then external charges are introduced into the power supply, but the voltage magnitude increases and amplifiers are damaged
Solution Approach 1:
A protection circuit is introduced as an intermediary component between the power supply and the amplifier circuits. This protection circuit includes a first capacitor connected in parallel with the power supply, a second capacitor connected in parallel with the amplifier input terminal, and a resistor connected between the capacitors. This intermediary structure absorbs and dissipates ESD charges before they reach the amplifiers, preventing voltage surges from damaging the amplifiers while allowing normal power supply operation.
2Reliability
If protection circuit is added, then amplifiers are protected from ESD, but device complexity increases
Solution Approach 1:
The protection circuit utilizes passive electronic components (capacitors and resistors) with specific electrical parameters designed to handle ESD events. The first capacitor is sized to absorb ESD energy, the second capacitor filters voltage fluctuations at the amplifier input, and the resistor provides a discharge path with controlled impedance. By optimizing these parameter values, the circuit achieves effective ESD protection while maintaining a relatively simple structure that can be integrated into existing power supply designs.
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 protection circuit effectively discharges electro-static charges to ground, preventing them from affecting the amplifiers and thus preventing abnormal voltage output and potential damage due to electro-static discharging.
Implementation Method 1
The protection circuit effectively discharges electro-static charges to ground, preventing them from affecting the amplifiers
Data Source
AI summary
There is disclosed an electronic device including a display panel including one or more pixels, one or more gate drivers receiving electric power from a first power supply, and a display driver integrated circuit configured to drive the display panel. Any one of the one or more gate drivers is connected to a first pixel of the one or more pixels, the display driver integrated circuit includes one or more source drivers including a first source driver and at least one protection circuit connected to the first source driver, the first source driver includes one or more amplifier circuits receiving electric power from a second power supply different from the first power supply and connected to the first pixel, the at least one protection circuit is connected to a power input terminal of the one or more amplifier circuits, and at least a portion of the at least one protection circuit is branched between the second power supply and the power input terminal to be connected to a ground of the display driver integrated circuit. In addition to the above, various embodiments identified through the specification are possible.