Source electrode driving module power supply circuit, display panel and display device

Abstract

The invention discloses a source electrode driving module power supply circuit, a display panel and a display device, and aims at avoiding the adverse phenomena of burnout of a source electrode driving module due to oversized or undersized power supply voltage of the power supply circuit. The power supply circuit comprises a first voltage comparison module, a second voltage comparison module and a switch control module. The first voltage comparison module is used for comparing the size of an analog voltage signal and reference voltage of analog voltage. When the analog voltage signal is determined to be greater than or equal to the reference voltage of the analog voltage, a first signal is outputted to the switch control module. The second voltage comparison module is used for comparing the size of a digital voltage signal and reference voltage of digital voltage. When the digital voltage signal is determined to be less than or equal to the reference voltage of the digital voltage, a third signal is outputted to the switch control module. The switch control module is used for stopping outputting of the analog voltage signal when the switch control module receives the first signal or the third signal.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a power supply circuit of a source drive module, a display panel and a display device. Background technique [0002] There is a design flaw in the source driver IC used in the current display device products, that is, the digital working voltage VDD and the analog working voltage AVDD of the two power supply voltages for the source driving module, when VDD<VDD_min, Or when AVDD>AVDD_max, AVDD will generate a large current, causing the circuit of the source driver module to be burned, where VDD_min is the minimum value of the digital working voltage, and AVDD_max is the maximum value of the analog working voltage. [0003] Specifically, the situations that cause the circuit of the source driver module to be burned include: 1. When the display device is turned off, see figure 1 , VDD is powered off, so that VDD<VDD_min, at this time switch K1 is closed, and each ...

AI Technical Summary

Problems solved by technology

[0002] There is a design flaw in the source driver IC used in the current display device products, that is, the digital working voltage VDD and the analog working voltage AVDD of the two power supply voltages for the source driving module, when VDDAVDD_max, AVDD will generate a large current, causing the circuit of the source driver module to be burned, where VDD_min is the minimum value of the digital working voltage, and AVDD_max is the maximum value of the analog working voltage

[0003] Specifically, the situations that cause the circuit of the source driver module to be burned include: 1. When the display device is turned off, see figure 1 , VDD is powered off, so that VDD<VDD_min, at this time switch K1 is closed, and each channel of the source will discharge the residual charge to the ground, so that the power supply circuit of AVDD and VDD are turned on to form a loop, and a large current is generated, causing the source to drive The circuit of the module is burned; or, when the voltage of AVDD is generated by the boost of VDD, when the display device is turned off, the voltage value of AVDD drops gradually with the drop of VDD, and when the XON is turned on at the moment of shutdown, VDD appears instantaneously Pulling down will lead to a large current in AVDD, or when the power supply of the display is unstable during work and VDD is pulled down, AVDD will also have the risk of high current

2. When the AVDD power supply of the display device is not converted by VDD, but is powered by an external circuit, if there is a live operation plugging action, or the connector is misaligned, a higher voltage such as VGH will be loaded on the AVDD power supply In the process, the high voltage of AVDD will be caused, which will also cause the circuit of the source driver module to be burned

[0004] Therefore, with the increase in the number of switching on and off of the display device, or the plugging and unplugging actions of live work, etc., the voltage of AVDD increases and excessive current is generated, which causes the circuit of the source driver module to be burned, which has a serious impact on the reliability of the product. influences

Images