An organic light emitting display device is disclosed, which comprises an anode electrode provided in a light emitting area on a substrate having a plurality of pixels, each pixel including a light emitting area and a transmissive area; an organic light emitting layer on the anode electrode; a cathode electrode on the organic light emitting layer; an auxiliary electrode connected with the cathode electrode; and a connection electrode connected with the anode electrode and provided in the transmissive area of the substrate.

A display cell includes a signal line electrically connected to a pixel arranged in a display area, a signal pad unit disposed in a peripheral area adjacent to the display area, and including a signal pad electrically connected to the signal line, an inspection pad unit disposed in a turn-on inspection area, and including an inspection pad electrically connected to the signal pad, where the inspection pad is configured to receive a turn-on inspection signal, and a power supply voltage line configured to apply a power supply voltage to the pixel, extending from the inspection pad unit to the peripheral area, and divided into a plurality of sublines by at least one slit pattern in a cut-off area between the peripheral area and the turn-on inspection area.

A display cell includes a signal line electrically connected to a pixel arranged in a display area, a signal pad unit disposed in a peripheral area adjacent to the display area, and including a signal pad electrically connected to the signal line, an inspection pad unit disposed in a turn-on inspection area, and including an inspection pad electrically connected to the signal pad, where the inspection pad is configured to receive a turn-on inspection signal, and a power supply voltage line configured to apply a power supply voltage to the pixel, extending from the inspection pad unit to the peripheral area, and divided into a plurality of sublines by at least one slit pattern in a cut-off area between the peripheral area and the turn-on inspection area.

An apparatus for evaluating photostability of a material for an organic material layer of an organic light emitting device, the apparatus comprising a photostability chamber provided with at least four light source zones, comprising a first light source zone provided with a daylight light source; a second light source zone provided with a white fluorescent light source; a third light source zone provided with a UV-cutoff (UV-cut) light source; and a fourth light source zone to which no light is irradiated.

An apparatus for evaluating photostability of a material for an organic material layer of an organic light emitting device, the apparatus comprising a photostability chamber provided with at least four light source zones, comprising a first light source zone provided with a daylight light source; a second light source zone provided with a white fluorescent light source; a third light source zone provided with a UV-cutoff (UV-cut) light source; and a fourth light source zone to which no light is irradiated.

A display device includes: a substrate; a display element layer disposed on the substrate, where the display element layer includes a light emitting element which emits light; a polarizing film disposed on the display element layer, where the polarizing film includes a first polarizer having a first absorption axis extending to a first direction and a first transmission axis extending to a second direction orthogonal to the first direction; and a first layer disposed on one surface of the polarizing film, where the first layer has a first phase difference. Light emitted from the display element layer has a polarizing axis, and an angle between the polarizing axis and one of the first absorption axis and the first transmission axis is in a range of about 25 degrees to about 65 degrees.

A display device includes: a substrate; a display element layer disposed on the substrate, where the display element layer includes a light emitting element which emits light; a polarizing film disposed on the display element layer, where the polarizing film includes a first polarizer having a first absorption axis extending to a first direction and a first transmission axis extending to a second direction orthogonal to the first direction; and a first layer disposed on one surface of the polarizing film, where the first layer has a first phase difference. Light emitted from the display element layer has a polarizing axis, and an angle between the polarizing axis and one of the first absorption axis and the first transmission axis is in a range of about 25 degrees to about 65 degrees.

A display apparatus includes: a substrate; a pixel circuit on the substrate and including a first transistor and a second transistor; an organic light-emitting diode connected to the pixel circuit; a connection line including a first connection line connected to the first transistor and a second connection line connected to the second transistor; and a disconnection portion configured to disconnect the first connection line and the second connection line from each other.

A display apparatus includes: a substrate; a pixel circuit on the substrate and including a first transistor and a second transistor; an organic light-emitting diode connected to the pixel circuit; a connection line including a first connection line connected to the first transistor and a second connection line connected to the second transistor; and a disconnection portion configured to disconnect the first connection line and the second connection line from each other.

A display device includes a substrate, a display area disposed on the substrate and including a plurality of pixels and data lines, a peripheral area disposed outside the display area of the substrate, a pad portion disposed in the peripheral area, an encapsulation layer disposed in the peripheral area and the display area, and disposed on the plurality of pixels of the display area, a crack detection circuit disposed in the peripheral area, and a first crack detection line connected with the pad portion and the crack detection circuit. The first crack detection line is disposed on the encapsulation layer.