Organic light emitting diode driving circuit and display device

Abstract

The invention discloses an organic light emitting diode driving circuit. The organic light emitting diode driving circuit includes an eleventh thin film transistor which is opened according to a scanning voltage and transmits a data voltage, a twelfth thin film transistor which produces a driving current, a thirteenth thin film transistor which controls whether the driving current is transmitted to the anode of an organic light emitting diode according to a trigger driving signal, and the organic light emitting diode which provides light. According to the organic light emitting diode driving circuit of the invention, the time ratio of the bright state to the dark state of the organic light emitting diode is controlled by an externally input trigger driving signal, the function of displaying pictures of different gray scales under the drive of the same current is achieved, and the problem of uneven picture caused by low driving current and unstable current during the display of low-gray-scale pictures can be avoided. The invention further discloses a display device using the organic light emitting diode driving circuit.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an organic light emitting diode driving circuit and a display device thereof. Background technique [0002] The organic light emitting display device utilizes the advantages of high contrast ratio, high color gamut, wide viewing angle, low power consumption, and thinner and thinner brought by organic light emitting diodes (OLEDs), which are favored by the market. The principle of OLED light emission is briefly as follows: under the action of an external electric field, the electrons and holes provided by the cathode and anode are combined in the light-emitting layer to form excitons, and the excitons return to the ground state to emit photons. Therefore, OLED is a current light-emitting device. The circuit in the board controls the magnitude of the current, and then controls the brightness of the light. [0003] A prior art OLED drive circuit such as figure 1 As shown, the OLE...

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Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the present invention discloses an organic light emitting diode driving circuit. The organic light emitting diode driving circuit uses an externally input trigger driving signal to control the time ratio of the organic light emitting diode being bright and dark, so as to achieve different display under the same current driving. The purpose of the grayscale image is to avoid the problem of image unevenness caused by low driving current and unstable current when displaying low grayscale

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