CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims the benefit of Korean Patent Application No. 10-2020-0092910, filed on Jul. 27, 2020, which is hereby incorporated by reference as if fully set forth herein.

BACKGROUND

Technical Field

The present disclosure relates to an electroluminescent display device.

Description of the Related Art

Electroluminescent display devices are divided into inorganic electroluminescent display devices and organic electroluminescent display devices according to materials of emission layers. Each pixel of the electroluminescent display device includes a self-luminescent light-emitting element and adjusts luminance by controlling the amount of luminescence of the light-emitting element according to grayscales of image data. Each pixel circuit may include a driving transistor that supplies a pixel current to the light-emitting element, at least one switching transistor that programs a gate-source voltage of the driving transistor, and a capacitor. Such an electroluminescent display device is becoming advanced to a high-definition display device. High-definition models employ a double rate driving (DRD) type in order to secure a tap interval between source integrated circuits constituting a data driver and to reduce manufacturing cost.

BRIEF SUMMARY

The inventors of the present disclosure have recognized that, according to the DRD type in the related art, two pixels contiguously disposed in the horizontal direction having a single data line therebetween share the single data line and are sequentially driven by a data voltage supplied from the data line. When the DRD type is employed, processing margin can be secured and manufacturing cost is reduced because not only the number of output channels of the data driver but also the number of data lines connected to the output channels of the data driver are reduced to half the number of pixels belonging to one pixel line (here, one pixel line means a set of pixels contiguously disposed in the horizontal direction). However, the inventors have appreciated that, when the DRD type is employed, the number of gate lines may be doubled because driving timings of two pixels sharing a data line need to be temporally separated from each other. Gate lines are connected to a gate driver. When the number of gate lines increases, the circuit size of the gate driver and the area in which the gate driver is mounted increase, and thus panel design may be restricted due to an insufficient design area and a bezel area of a display panel may increase. The inventors of the present disclosure have realized that these problems in the related art may become serious in a pixel structure for internal compensation. That is, a pixel structure in which electrical characteristic change in a driving transistor including a plurality of switching transistors is compensated in a pixel circuit.

Accordingly, to solve the aforementioned problems as well as other problems in the related art, embodiments of the present disclosure provide an electroluminescent display device capable of reducing or minimizing increase in the number of gate lines in a DRD internal compensation type.

To achieve the technical benefits and other advantages of the disclosure, as embodied and broadly described herein, an electroluminescent display device includes a first pixel, a second pixel sharing a data line, a reference voltage line, and an initialization voltage line with the first pixel and disposed adjoining the first pixel in a horizontal direction, a first gate line connected to the first pixel and provided to supply a first gate control signal to the first pixel, a second gate line connected to the second pixel and provided to supply a second gate control signal to the second pixel, a third gate line commonly connected to the first and second pixels and provided to supply a third gate control signal to the first and second pixels, and a fourth gate line commonly connected to the first and second pixels and provided to supply a fourth gate control signal to the first and second pixels, wherein a channel width of a first driving element included in the first pixel differs from a channel width of a second driving element included in the second pixel.

