OLED pixel driving circuit and OLED display device

Abstract

The invention provides an OLED pixel driving circuit and an OLED display device. The OLED pixel driving circuit adopts a 4T1C structure, and a diverter switch (K) is provided. The first pin (K1) of the diverter switch (K) is electrically connected with a drain electrode of a third thin film transistor (T3), and the second pin (K2) of the diverter switch (K) is electrically connected with a digital to analog converter (DAC). The third pin (K3) of the diverter switch (K) is electrically connected with an analog to digital converter (ADC), and switching signals (switch) are used to control the connection of the diverter switch (K) with the first pin (K1) and the second pin (K2) to enter a display mode. The switching signals (switch) are used to control the connection of the diverter switch (K) with the first pin (K1) and the third pin (K3) to enter a sensing mode. The analog to digital converter (ADC) is used to sense a threshold voltage of a fourth thin film transistor (T4), and after the analog to digital conversion, the threshold voltage is used for data compensation in the display mode, and therefore a compensation function is provided, display uniformity is improved, a pixel aperture ratio is improved, and production costs are reduced.

Description

Technical field [0001] The present invention relates to the field of display technology, in particular to an OLED pixel drive circuit and an OLED display device. Background technique [0002] Organic Light Emitting Display (OLED) display devices have self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, close to 180° viewing angle, wide operating temperature range, and can realize flexible display and Large-area full-color display and many other advantages are recognized by the industry as the display device with the most development potential. [0003] OLED is a current-driven device. When a current flows through the organic light-emitting diode, the organic light-emitting diode emits light, and the light-emitting brightness is determined by the current flowing through the organic light-emitting diode itself. Most of the existing integrated circuits (Integrated Circuit, IC) only transmit voltage signals, so the pixel ...

AI Technical Summary

Problems solved by technology

[0010] 1. The reference voltage signal Vref provides a reference voltage for each pixel, and its wiring reduces the aperture ratio of the pixel

[0011] 2. The generation of the reference voltage signal Vref increases the number of channels of the driver IC and increases the manufacturing cost

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