An Organic Light Emitting Diode, OLED, pixel circuit of a display device in which display is controlled by a display data having a plurality of bits (B0, B1, B2, B3, B4, B5), comprising: different bit transistors (6-0, 6-1, 6-2, 6-3, 6-4, 6-5) each of them having the gate connected to a different data line configured to supply digital signals corresponding to bits; a plurality of coupling capacitances (7-0, 7-1, 7-2, 7-3, 7-4, 7-5) connected to a data enable line and to one terminal of their correspondent bit transistor, wherein the data enable line is configured to deliver at least two different constant voltages, and wherein the values (C0, C1, C2, C3, C4, C5) of the coupling capacitances depend on the significance of the bit line to which they are connected through the corresponding bit transistor; an organic electroluminescence display element (1, 1A, 1R, 1G, 1B): a driving transistor (2, 2A, 2R, 2G, 2B) configured to provide current to the organic electroluminescence element, wherein the source of the driving transistor is connected to a power supply line, and connected to the other terminal of the plurality of bit transistors by means of a selection transistor (3, 3A, 3R, 3G, 3B) which is gate-controlled by a selection line (13, 13A, 13R, 13G, 13B) and which is configured to control a gate connection of the driving transistor, such that the voltage accumulated in the equivalent resultant coupling capacity in accordance with differences between the two constant voltages which are set by the data enable line is applied to the gate of the driving transistor; a retentive capacity (8, 8A, 8R, 8G, 8B) configured to connect between source and gate of the driving transistor; a reset transistor (4, 4A, 4R, 4G, 4B) configured to control a connection between source and drain of the driving transistor, wherein the reset transistor is connected between the other terminal of plurality of bit transistors and the drain of the driving transistor; and a light emission control transistor (5, 5A, 5R, 5G, 5B) configured to control a connection between the drain of the driving transistor and the organic electroluminescence element, wherein a voltage corresponding to the threshold voltage of the driving transistor is retained by the retention capacitance when the light emission control transistor is turned off and the reset transistor is turned on, and then a voltage accumulated to the total capacity of the plurality of coupling capacitances is applied to the gate of the driving transistor. different bit transistors (6-0, 6-1, 6-2, 6-3, 6-4, 6-5) each of them having the gate connected to a different data line configured to supply digital signals corresponding to bits; a plurality of coupling capacitances (7-0, 7-1, 7-2, 7-3, 7-4, 7-5) connected to a data enable line and to one terminal of their correspondent bit transistor, wherein the data enable line is configured to deliver at least two different constant voltages, and wherein the values (C0, C1, C2, C3, C4, C5) of the coupling capacitances depend on the significance of the bit line to which they are connected through the corresponding bit transistor; an organic electroluminescence display element (1, 1A, 1R, 1G, 1B): a driving transistor (2, 2A, 2R, 2G, 2B) configured to provide current to the organic electroluminescence element, wherein the source of the driving transistor is connected to a power supply line, and connected to the other terminal of the plurality of bit transistors by means of a selection transistor (3, 3A, 3R, 3G, 3B) which is gate-controlled by a selection line (13, 13A, 13R, 13G, 13B) and which is configured to control a gate connection of the driving transistor, such that the voltage accumulated in the equivalent resultant coupling capacity in accordance with differences between the two constant voltages which are set by the data enable line is applied to the gate of the driving transistor; a retentive capacity (8, 8A, 8R, 8G, 8B) configured to connect between source and gate of the driving transistor; a reset transistor (4, 4A, 4R, 4G, 4B) configured to control a connection between source and drain of the driving transistor, wherein the reset transistor is connected between the other terminal of plurality of bit transistors and the drain of the driving transistor; and a light emission control transistor (5, 5A, 5R, 5G, 5B) configured to control a connection between the drain of the driving transistor and the organic electroluminescence element, wherein a voltage corresponding to the threshold voltage of the driving transistor is retained by the retention capacitance when the light emission control transistor is turned off and the reset transistor is turned on, and then a voltage accumulated to the total capacity of the plurality of coupling capacitances is applied to the gate of the driving transistor.