External compensation induction circuit, induction method of external compensation induction circuit and display device

Abstract

The invention relates to an external compensation induction circuit in the technical field of organic light-emitting display, an induction method of the external compensation induction circuit and a display device. The external compensation induction circuit comprises a difference amplifier, a first capacitor, a second capacitor and a first capacitor output voltage control circuit, wherein the negative input end of the difference amplifier is connected with a display screen; the positive input end of the difference amplifier is connected with reference voltage; the output end of the difference amplifier is connected with that of the first capacitor output voltage control circuit; and the first capacitor output voltage control circuit is used for enabling the output voltage of the first capacitor to change in the follow-up current integration stage by taking the reference voltage as a reference. The external compensation induction circuit, the induction method of the external compensation induction circuit and the display device provided by the invention can utilize the capacitors to store offset voltage of the amplifier at the incipient stage so as to eliminate voltage output difference between different passages caused by maladjustment of the amplifier and improve the voltage output precision.

Description

technical field [0001] The invention relates to the technical field of organic light-emitting display, in particular to an external compensation sensing circuit, a sensing method thereof, and a display device. Background technique [0002] Organic Light-Emitting Diode (OLED, Organic Light-Emitting Diode), as a current-mode light-emitting device, has been increasingly used in high-performance display devices. Traditional passive matrix organic light-emitting display tubes (Passive Matrix OLED) require shorter driving time of a single pixel with the increase of display size, thus need to increase transient current and increase power consumption. At the same time, the application of a large current will cause an excessive voltage drop on the nano-indium tin oxide (ITO, Indium Tin Oxides) line, and make the working voltage of the OLED too high, thereby reducing its efficiency. The active matrix organic light-emitting display tube (AMOLED, Active Matrix OLED) can solve these pro...

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Problems solved by technology

[0006] Third, the uneven film thickness of OLED devices will also cause non-uniformity in electrical properties during evaporation.

The traditional induction circuit is composed of a current integrator. The converted output voltage is related to the offset voltage of the amplifier. Due to process errors and system errors, the amplifier offset voltage of each induction circuit unit is usually different, which will reduce the output. The accuracy of the voltage, the current difference between the columns in the PANEL cannot be accurately compared

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