Pixel circuit and display device

Abstract

The invention provides a pixel circuit and a display device. The pixel circuit comprises a charging unit, a luminescence unit and an error compensation unit. The voltage storage end of the charging unit is connected to the voltage input end of the luminescence unit. One end of the error compensation unit is connected to the voltage storage end of the charging unit. The voltage of the voltage storage end of the charging unit is used for determining a current flowing through the luminescence unit. The control unit of the error compensation unit is used for receiving a luminescence control signal. The luminescence control signal is used for making the luminescence unit give out light or stop giving out light. The error compensation unit is used to reduce the voltage of the voltage storage endof the charging unit when the luminescence control signal makes the luminescence unit give out the light. Through adding the error compensation unit in the pixel circuit, the voltage rise of the voltage input end of the luminescence unit is reduced when a charging phase is ended and a luminescence phase is started so as to increase the brightness consistency of a display screen and improve display quality.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel circuit and a display device. Background technique [0002] Organic Light Emitting Diode (OLED for short) display devices have the advantages of self-illumination, low driving voltage, thinness, fast response and high contrast, and are widely used in the display field. [0003] In the manufacturing process of OLED displays, due to technological reasons, there is usually a problem of uneven threshold voltage of transistor device parameters, which in turn leads to uneven brightness in the OLED display and a decrease in display quality. figure 1 It is a structural schematic diagram of an existing pixel circuit. Such as figure 1 The pixel circuit shown well solves the above problems. [0004] However, if figure 1 In the pixel circuit shown, when the charging phase of the transistor device M3 in the charging circuit ends and the light emitting phase starts, the ch...

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Problems solved by technology

[0004] However, if figure 1 In the pixel circuit shown, when the charging phase of the transistor device M3 in the charging circuit ends and the light emitting phase starts, the channel charge of M3 is injected into the node P through the coupling, and the error ΔV1 is introduced to make the voltage V of point P P rise, which in turn affects the current of the light-emitting element OLED during the light-emitting phase

And because the M3 in each pixel circuit in the display screen is different, the error ΔV1 is also different, so this error will lead to uneven brightness in the OLED display screen and a decrease in display quality

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