CROSS-REFERENCE TO RELATED APPLICATION

This application is based on and claims priority of Chinese Patent Application No. 201910945598.4, filed on Sep. 30, 2019, which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the field of display technologies, in particular to a light emitting control circuit, an array substrate and a display device, and a driving method of the light emitting control circuit.

BACKGROUND

Micro Light Emitting Diode (Micro LED) device is expected to become the next generation mainstream display technology due to the characteristics of high efficiency and strong resistance to water and oxygen.

In the field of display technology, especially in the super-large size display technology, Micro LED devices help to achieve better display effect and lower cost. In the current applications, Micro LED can be firstly fabricated on a substrate and then assembled by means of transfer printing onto another substrate with larger size and logic circuits, so as to meet the needs of large-size display screens such as mobile phones and televisions.

SUMMARY

According to the embodiments of the present disclosure, a light emitting control circuit is provided, the light emitting control circuit includes:

a light emitting device;

a driving circuit including a driving switch device, a first terminal of the driving switch device is connected with an anode of the light emitting device, the driving switch device is configured to drive the light emitting device to emit light when the driving switch device is turned on;

a detection circuit, one terminal of the detection circuit is connected with a control terminal of the driving switch device, and the other terminal of the detection circuit is connected with the anode of the light emitting device, the detection circuit is configured to detect whether the light emitting device is short-circuited in the detection stage of the light emitting control circuit; if the light emitting device is short-circuited, the driving switch device is turned off in the light emitting stage of the light emitting control circuit; if the light emitting device is not short-circuited, the driving switch device is turned on in the light emitting stage of the light emitting control circuit.

Optionally, the detection circuit includes:

a first switch device, a first terminal of the first switch device is connected with the control terminal of the driving switch device, a second terminal of the first switch device is connected with a test voltage terminal; a difference between the test voltage provided by the test voltage terminal and the voltage on the second terminal of the driving switch device is greater than the turning-on voltage of the driving switch device; the first switch device is configured to be turned on in the detection stage if the light emitting device is short-circuited, or turned off in the detection stage if the light emitting device is not short-circuited;

a second switch device, a first terminal of the second switch device is connected with the control terminal of the first switch device, a control terminal of the second switch device receives a detection control signal, a second terminal of the second switch device is connected with the anode of the light emitting device; the second switch device is configured to be turned on in the detection stage in response to the detection control signal, and turned off in the light emitting stage in response to the detection control signal.

Optionally, the first switch device is a P-type TFT transistor, and the second switch device is an N-type TFT transistor.

Optionally, the driving circuit further includes:

a data writing switch device, a first terminal of the data writing switch device is connected with the data voltage terminal, and the control terminal of the data writing switch device receives a gate control signal, the second terminal of the data writing switch device is connected with the control terminal of the driving switch device, the data writing switch device is configured to be turned on in response to the gate control signal in the data writing stage of the light emitting control circuit, and turned off in response to the gate control signal in the detection stage and the light emitting stage;

a light emitting control switch device, a first terminal of the light emitting control switch device is connected with a power supply, and the control terminal of the light emitting control switch device receives a light emitting control signal, the second terminal of the light emitting control switch device is connected with the second terminal of the driving switch device, the light emitting control switch device is configured to be turned off in response to the light emitting control signal in the data writing stage and the detection stage, and turned on in response to the light emitting control signal in the light emitting stage; and

a capacitor, one terminal of the capacitor is respectively connected with the second terminal of the data writing switch device and the control terminal of the driving switch device, the other terminal of the capacitor is respectively connected with the second terminal of the light emitting control switch device and the second terminal of the driving switch device.

Optionally, the driving switch device, the data writing switch device and the light emitting control switch device are P-type TFT transistors.

Optionally, the threshold voltage range of the first switch device is:
VSS−Vtest<Vth1<VSS+Vled−Vtest

wherein, VSS is the cathode potential of the light emitting device, Vtest is the test voltage, Vth1 is the threshold voltage of the first switch device, and Vled is the turning-on voltage of the light emitting device.

Optionally, the threshold voltage range of the driving switch device is:
VData−VDD<Vth3<Vtest−VDD

wherein, VData is the data voltage provided by the data voltage terminal, VDD is the power supply voltage, Vth3 is the threshold voltage of the driving switch device, and Vtest is the test voltage.

According to the embodiments of the present disclosure, an array substrate is further provided, the array substrate includes a plurality of pixel units arranged in an array, each of which includes a light emitting control circuit described above.

According to the embodiments of the present disclosure, a display device including the above array substrate is further provided.

According to the embodiments of the present disclosure, a method for driving the light emitting control circuit is further provided, the driving method includes a data writing stage, a detection stage and a light emitting stage, wherein

in the data writing stage, the driving switch device and the detection circuit are turned off, and the data voltage is applied across the control terminal of the driving switch device and the second terminal of the driving switch device through the driving circuit;

in the detection stage, the driving circuit is turned off, and the detection circuit detects whether the light emitting device is short-circuited;

in the light emitting stage, if the light emitting device is short-circuited, the driving switch device is controlled by the detection circuit to be turned off, and if the light emitting device is not short-circuited, the driving switch device is controlled by the detection circuit to be turned on, so that the driving switch device drives the light emitting device to emit light.

According to the embodiments of the present disclosure, the light emitting control circuit is provided on a back plate, and includes: a light emitting device; a driving circuit including a driving switch device, a first terminal of the driving switch device is connected with an anode of the light emitting device, the driving switch device is configured to drive the light emitting device to emit light when the driving switch device is turned on; a detection circuit, one terminal of the detection circuit is connected with a control terminal of the driving switch device, and the other terminal of the detection circuit is connected with the anode of the light emitting device, the detection circuit is configured to detect whether the light emitting device is short-circuited in the detection stage of the light emitting control circuit; if the light emitting device is short-circuited, the driving switch device is turned off in the light emitting stage of the light emitting control circuit, so as to avoid burning the back plate due to the short-circuit of the light emitting device; and if the light emitting device is not short-circuited, the driving switch device is turned on in the light emitting stage of the light emitting control circuit, so as to ensure that the light emitting device which is not short-circuited can emit light normally during the light emitting stage.

