An organic light emitting display panel and its driving method

Abstract

The invention relates to an organic light-emitting display panel and a driving method thereof. The organic light-emitting display panel comprises at least one first circuit and a plurality of second circuits, at least one reference voltage line and a plurality of data lines, wherein the first circuit comprises a signal generating unit, a signal input control unit and a signal detecting unit; each second circuit comprises a first transistor; the first circuit and the second circuits are connected by means of the data lines, and the reference voltage line is connected with the second circuits; and the first circuit is used for capturing and compensating for a threshold value of the first transistor in each second circuit. The organic light-emitting display panel and the driving method thereof provided by the invention can solve the problems of uneven display caused by threshold voltage drift and covertly-lightened organic light-emitting diode in the threshold value detection process; and the organic light-emitting display panel is convenient for layout design, and caters to the design requirements for high PPI in the current market.

Description

technical field [0001] The invention relates to the display field, in particular to an organic light emitting display panel and a driving method thereof. Background technique [0002] In recent years, various light-weight and small-sized flat panel display devices have been developed instead of cathode ray tubes. Examples of these flat panel display devices include liquid crystal display panels, plasma display panels, and electroluminescence display panels. Among them, the electroluminescent display panel realizes the normal display of the display panel through the electroluminescent device in the display panel. According to the different materials of the light-emitting layer, the electroluminescent device is divided into two types: inorganic light-emitting and organic light-emitting. Response speed, high luminous efficiency, strong brightness, and wide viewing angle are called the new generation display technology in the industry. [0003] As a current-controlled light-em...

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Problems solved by technology

[0011] but, Figure 1A During the process of threshold value compensation by the external compensation circuit shown, at time t1 and t2, due to the conduction of the second transistor T2, there will be a problem that the organic light emitting diode D steals light; At this time, the potentials are respectively written into the first node Q1 and the second node Q2. Since the second transistor T2 is turned on due to the potential of the first node Q1 at this time, the electrical signal input by the first constant voltage source VDD passes through the second transistor T2 It is transmitted to the second node Q2, that is, at this moment, the potential signal of the first constant voltage source VDD and Vref are written into the second node Q2 at the same time, so it cannot be guaranteed that the potential of the second node Q2 is written into an ideal potential

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