A kind of panel drive circuit and pcb substrate

Abstract

The embodiment of the invention discloses a panel driving circuit and a PCB substrate. The panel drive circuit includes a signal input terminal, an operational amplifier, a current feedback module, a voltage feedback module, a first emitter follower module, a second emitter follower module, a first mirror current module, a second mirror current module, a power amplification module and a signal output terminal; the current feedback module is used to provide current feedback signal to the first emitter follower module; It can output AC signals with high speed change, high voltage, small overshoot, and high current, thereby improving the performance of the panel drive circuit.

Description

technical field [0001] Embodiments of the present invention relate to panel detection technology, and in particular to a panel driving circuit and a PCB substrate. Background technique [0002] With the development of panel technology, the resolution has been greatly improved, and there are more and more panel inspection items. The requirements for driving signals during inspection have also been upgraded, from the original single focus on DC performance or AC performance to the simultaneous requirement of DC , AC performance. [0003] The main component of the existing panel drive circuit is an operational amplifier. The performance of the operational amplifier determines the performance of the panel drive circuit. Some of the operational amplifiers have high precision but low speed, and are mainly suitable for panel drive circuits that output DC signals; Some operational amplifiers are fast but not accurate enough, and are mainly suitable for panel drive circuits that out...

AI Technical Summary

Problems solved by technology

[0003] The main component of the existing panel drive circuit is an operational amplifier. The performance of the operational amplifier determines the performance of the panel drive circuit. Some of the operational amplifiers have high precision but low speed, and are mainly suitable for panel drive circuits that output DC signals; Some operational amplifiers are fast but not accurate enough, and are mainly suitable for panel drive circuits that output AC signals, and high-voltage power supplies cannot be used directly, otherwise the chip will be burned; in addition, the output voltage range of operational amplifiers is usually relatively narrow, generally not exceeding positive Negative 20V, using external discrete components to expand the output voltage of the operational amplifier will cause a decrease in speed. Occasionally, an operational amplifier with a wide output voltage range cannot meet the speed and accuracy requirements. How to expand the voltage at the same time? High speed and reducing waveform distortion such as overshoot, back hook, and middle sag have become a technical difficulty. Moreover, when the output voltage or output current changes greatly, the working state of the entire circuit will drift to a certain extent, resulting in an abnormal deviation of the output voltage. linearity, reducing the output accuracy over the full voltage range

Therefore, it is difficult for the driving signal output by the existing panel driving circuit to meet the requirements of high voltage, high speed change, small overshoot, high current and high precision at the same time.

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