Pixel unit and drive circuit

Abstract

A pixel unit and a drive circuit are provided. The pixel unit comprises a light emitting element and the drive circuit. The drive circuit comprises a first transistor, a first switch, a capacitor, and a control module. The first switch has a first end electrically connected with a first power supply voltage, a second end electrically connected with a control end of the first transistor, and a control end receiving a first control signal. The capacitor is electrically connected between the control end and a second end of the first transistor. The control module is electrically connected between the second end of the first transistor and the light emitting element, and the control module receives a data voltage and the first control signal, and decides whether or not to generate a parameter current relevant to the data voltage and passing through the first transistor according to at least the first control signal. The first transistor generates a drive current equal to the parameter current according to the cross voltage between the control end and the second end of the first transistor, thereby overcoming the critical voltage offset problem of the first transistor.

Description

technical field [0001] The invention relates to a pixel unit and a driving circuit, in particular to a pixel unit and a driving circuit of a light-emitting element. Background technique [0002] Nowadays, it is quite common to use light-emitting devices such as light-emitting diodes (LEDs) and organic light-emitting diodes (OLEDs) as light sources. The brightness of the light-emitting element is determined according to the driving current flowing through it. Therefore, for a driving circuit for driving the light-emitting element, the characteristics of the transistor used to generate the driving current often have a great influence on the luminescence of the light-emitting element. Performance has the biggest impact. [0003] Due to uniformity problems in the manufacturing process, a panel composed of a plurality of light-emitting elements and corresponding driving circuits has different threshold voltages for each transistor used to generate driving current, resulting in a...

AI Technical Summary

Problems solved by technology

[0003] Because of the uniformity problem in the manufacturing process, the panel composed of multiple light-emitting elements and the corresponding driving circuit, in which the threshold voltage of each transistor used to generate the driving current is different, resulting in a difference in the driving current

In addition, with long-term operation and use, each transistor used to generate the driving current will have different degrees of degradation, which will also cause the deviation of the threshold voltage to be inconsistent, and also cause differences in the driving current.

These will cause unequal driving currents under the same data input, which will make the panel composed of these light-emitting elements and corresponding driving circuits show uneven brightness or burn-in phenomenon.

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