Pixel compensation circuit of monocrystalline silicon transistor CMOS driving display and display equipment

Abstract

The invention discloses a pixel compensation circuit of monocrystalline silicon transistor CMOS driving display. The pixel compensation circuit comprises a driving transistor and first to fourth switching units; a first end of the third switching unit is used to input a reference current, a second end of the third switching unit is electrically connected with a drain electrode of the driving transistor, and a third end of the third switching unit is used to input a first control signal; a first end of the fourth switching unit is electrically connected with a second end of the first switching unit, a second end of the fourth switching unit is electrically connected with a source electrode of the driving transistor, and a third end of the fourth switching unit is used to input a first or second control signal; and ON / OFF of corresponding first and second ends of the first, second and third switching units is controlled via the first control signal, and ON / OFF of the first and second ends of the fourth switching unit is controlled via the first or second control signal. Thus, influence of drift of a threshold voltage in the light emission process on a light emitting device can be avoided, and uniform display and consistent brightness are achieved.

Description

technical field [0001] The invention relates to a pixel compensation technology, in particular to a pixel compensation circuit and a display device for display driven by a single crystal silicon transistor CMOS. Background technique [0002] The ability of OLED to emit light is driven by the current generated by driving mos, because when the same gray scale voltage is input, different threshold voltages Vth will generate different driving currents, resulting in inconsistency of the driving current, and at the same time, the mobility u will also be uneven. causing current inconsistencies. [0003] When the glass panel TFT drives the display, the uniformity of the threshold voltage Vth on the TFT process is very poor. At the same time, the threshold voltage Vth also drifts, the mobility u is uneven, and the IR-drop of the operating voltage Vdd (voltage drop caused by multiplying the current by the resistance) It has always existed, so the brightness uniformity of the traditio...

AI Technical Summary

Problems solved by technology

[0002] The ability of OLED to emit light is driven by the current generated by driving mos, because when the same gray scale voltage is input, different threshold voltages Vth will generate different driving currents, resulting in inconsistencies in driving currents, and at the same time, the mobility u will also be uneven. causing current inconsistencies

[0003] When the glass panel TFT drives the display, the uniformity of the threshold voltage Vth on the TFT process is very poor. At the same time, the threshold voltage Vth also drifts, the mobility u is uneven, and the IR-drop of the operating voltage Vdd (voltage drop caused by multiplying the current by the resistance) It has always existed, so the brightness uniformity of the traditional 2T1C circuit has always been poor

[0004] When the display is driven by single crystal silicon wafer mos, there will also be some slight threshold voltage Vth, uneven mobility u, and current mismatch problems, and the IR-drop of the working voltage Vdd will always exist

In this way, the uniformity of the traditional 2T1C circuit is not good, and the PPI is always low

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