Grating drive circuit and 3D (three-dimensional) display

Abstract

The invention is applicable to the field of 3D (three-dimensional) display, and provides a grating drive circuit and a 3D display; and the grating drive circuit comprises a polarity inversion circuit and a difference amplifying circuit. The grating drive circuit provided by the invention converts the polarity of an external square signal by the polarity inversion circuit and then outputs a first square signal PWM+(pulse-width modulation) and a second square signal PWM-, which have the completely opposite polarities; the difference amplifying circuit carries out difference amplification on the first square signal and the second square signal to output difference wave form COM and SEG signals with the same voltage and the opposite polarity to drive the grating; the square wave duty ratio of the drive grating is 50%, so that the service life of the grating can be prolonged; the structure of the grating drive circuit can be optimized, and the design cost of hardware can be reduced; and the frequency can be automatically adjusted, and the 3D display effect can be improved.

Description

technical field [0001] The invention belongs to the field of 3D display, in particular to a grating driving circuit and a 3D display. Background technique [0002] The existing grating driving circuit mainly uses a 555 device as a clock oscillator circuit to generate a square wave signal. Since the charging and discharging time of the 555 device to the capacitor is not equal, the output square wave period is constant, but the duty cycle is not 50%, so in the driving circuit, a counter is added behind the 555 device to divide the frequency of the square wave, and finally get A square wave with a duty cycle of 50%, a frequency of 38-45Hz, and an amplitude of 12V. Then, positive and negative voltages are generated through the charge and discharge polarity conversion of a capacitor C, and finally the required driving waveform is obtained. [0003] However, the existing grating drive circuit has the following problems: (1) The duty cycle of the output square wave cannot reach 5...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a grating drive circuit, aiming to solve the problem that the square wave duty cycle output by the existing grating drive circuit cannot be completely accurate to 50%, and the existing grating drive circuit is complicated and expensive. question

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