Pixel driving circuit and display device

Abstract

The invention provides a pixel driving circuit and a display device. The pixel driving circuit comprises a site selection transistor, a driving transistor, a storage capacitor and a plurality of pixelunits connected in parallel, the drain electrode of the site selection transistor is electrically connected with the grid electrode of the driving transistor. One end of the storage capacitor is connected with the gate of the driving transistor, the other end of the storage capacitor is connected with the drain electrode of the driving transistor; the pixel unit is connected with the drain electrode of the driving transistor, the pixel unit comprises a digital signal controller, and the digital signal controller is connected with the anodes of the plurality of light emitting units in series;the grid electrode of the site selection transistor receives a scanning signal, the digital signal controller provides a digital signal, and the scanning signal and the digital signal enable the light-emitting unit to emit light periodically to form a preset frame display picture. The pixel driving circuit has the beneficial effects that the digital signal controller is additionally arranged in the pixel driving circuit, so that the digital signal controller controls the light-emitting unit to emit light periodically to realize the matching of spatial multiplexing and time division multiplexing, and the problems that the gray-scale switching frequency of the pixel driving circuit is too high and the occupied space is relatively large are solved.

Description

technical field

[0001] The present application relates to the field of display technology, in particular to a pixel driving circuit and a display device. Background technique

[0002] In the active matrix display circuit, the pixel driving circuit is divided into two circuits: time division multiplexing circuit and space multiplexing circuit.

[0003] The time division multiplexing circuit is mainly based on the Pulse Width Modulation (PWM) circuit. This circuit divides the display time of one line into multiple different time periods, and switches the brightness and darkness of the light-emitting area in different time periods. To realize the switching of the gray scale, when this circuit is working, the driving thin film transistor (Thin Film Transistor, TFT) works in the linear region, so that the frequency of gray scale switching is too fast, which exceeds the existing driving chip (Integrated Circuit, IC) available switching frequency. The spatial multiplexing circuit...

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