Pulse width modulation integrated circuit and display device

Abstract

The invention discloses a pulse width modulation integrated circuit and a display device. The pulse width modulation integrated circuit comprises a voltage output unit, a voltage detection unit, a reference voltage output unit and a protective unit. The voltage output unit is used for outputting driving voltage. The voltage detection unit is used for detecting the driving voltage and correspondingly outputting first detection voltage. The reference voltage output unit is used for outputting first reference voltage. The protective unit generates an overvoltage protection threshold correspondingto the driving voltage according to the first reference voltage. When the first detection voltage is greater than the overvoltage protection threshold, the protective unit outputs an overvoltage protection signal to the voltage output unit and controls the voltage output unit to stop outputting the driving voltage.

Description

technical field [0001] The invention relates to the technical field of display driving, in particular to a pulse width modulation integrated circuit and a display device applied in a display device to provide a driving voltage for a driving circuit. Background technique [0002] Display devices have been more and more widely used in electronic devices in various fields of people's production and life, such as consumer electronics such as mobile phones, tablet computers or desktop computers, household appliances such as televisions, and public equipment such as outdoor advertisements. [0003] Currently, the display device is mainly a liquid crystal display (Liquid Crystal Display, LCD) or an organic light emitting display (Organic Light Emitting Diode, OLED). The display device needs to provide part of the driving voltage through a pulse width modulation integrated circuit (Pulse Width Modulation Integrated circuit, PWM IC), for example, it needs to use the PWM IC to provide...

AI Technical Summary

Problems solved by technology

However, currently only a fixed overvoltage protection threshold is set for the driving voltage VGH, so when the driving voltage changes, it is very easy to cause overvoltage of the driving voltage VGH and damage other devices electrically connected to the pulse width modulation integrated circuit. circuit

For example, if only a fixed overvoltage protection threshold of 45V is set, when the display device is working under light load, that is, the driving voltage VGH only needs a maximum voltage of 28V at this time. When the driving voltage VGH exceeds 28V, it is obviously reached The state of overvoltage protection for the pulse width integrated circuit is required, but the driving voltage VGH does not exceed the overvoltage protection threshold of 45V, and the overvoltage protection cannot correctly perform the protective function, resulting in damage to the pulse width adjustment integrated circuit itself and peripheral circuits

It can be seen that the fixed overvoltage protection threshold cannot be adjusted with the change of the driving voltage VGH, resulting in easier damage to the PWM IC and the display device, lower working stability and shorter life.

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