An organic light emitting diode, OLED, display panel comprising: a substrate including a first opening region, a second opening region, a non-display area that surrounds the first opening region and the second opening region, and a display area that surrounds the non-display area; a plurality of pixels arranged on the display area, each of the plurality of pixels comprises a pixel circuit and an OLED display element; a plurality of dummy pixels (Pd) arranged on the non-display area and emitting no light, wherein each of the plurality of dummy pixels (Pd) comprises a dummy pixel circuit (PC'); a plurality of signal lines configured to electrically connect the plurality of pixels to the plurality of dummy pixels; and a pixel defining layer arranged over the pixel circuit and the dummy pixel circuit (PC') and comprising an opening corresponding to each of the plurality of pixels, wherein each pixel circuit comprises at least one transistor, wherein each dummy pixel circuit comprises at least one dummy transistor, and a structure of each pixel circuit is a same structure as a structure of each dummy pixel circuit, wherein the pixel defining layer has a flat upper surface in correspondence with each dummy pixel, wherein the display element of each of the plurality of pixels includes a pixel electrode, an opposite electrode and an intermediate layer including an organic emission layer, wherein the pixel electrode of each pixel is connected to the pixel circuit of the respective pixel, wherein the intermediate layer is arranged within the opening of the pixel defining layer, wherein the opposite electrode is arranged over the intermediate layer, in correspondence with each pixel, wherein the opening corresponding to each of the plurality of pixels exposes the pixel electrode, wherein the pixel defining layer has no opening corresponding to each of the plurality of dummy pixels (Pd), wherein the opposite electrode is arranged also in correspondence with each dummy pixel on the pixel defining layer and wherein each dummy pixel has no pixel electrode, and wherein some of the plurality of dummy pixels are arranged between the first opening region and the second opening region. a substrate including a first opening region, a second opening region, a non-display area that surrounds the first opening region and the second opening region, and a display area that surrounds the non-display area; a plurality of pixels arranged on the display area, each of the plurality of pixels comprises a pixel circuit and an OLED display element; a plurality of dummy pixels (Pd) arranged on the non-display area and emitting no light, wherein each of the plurality of dummy pixels (Pd) comprises a dummy pixel circuit (PC'); a plurality of signal lines configured to electrically connect the plurality of pixels to the plurality of dummy pixels; and a pixel defining layer arranged over the pixel circuit and the dummy pixel circuit (PC') and comprising an opening corresponding to each of the plurality of pixels, wherein each pixel circuit comprises at least one transistor, wherein each dummy pixel circuit comprises at least one dummy transistor, and a structure of each pixel circuit is a same structure as a structure of each dummy pixel circuit, wherein the pixel defining layer has a flat upper surface in correspondence with each dummy pixel, wherein the display element of each of the plurality of pixels includes a pixel electrode, an opposite electrode and an intermediate layer including an organic emission layer, wherein the pixel electrode of each pixel is connected to the pixel circuit of the respective pixel, wherein the intermediate layer is arranged within the opening of the pixel defining layer, wherein the opposite electrode is arranged over the intermediate layer, in correspondence with each pixel, wherein the opening corresponding to each of the plurality of pixels exposes the pixel electrode, wherein the pixel defining layer has no opening corresponding to each of the plurality of dummy pixels (Pd), wherein the opposite electrode is arranged also in correspondence with each dummy pixel on the pixel defining layer and wherein each dummy pixel has no pixel electrode, and wherein some of the plurality of dummy pixels are arranged between the first opening region and the second opening region.