Display device

1. A display device comprising: a display unit in which pixels are arranged in a matrix, the pixels each including a light emitting element and a circuit element for driving the light emitting element to emit light; and a power supply unit configured to feed a power supply voltage to the pixels through a power feeding line disposed in an outer periphery region of the display unit,

wherein the pixels each include:

a first electrode formed on a drive circuit substrate on which the circuit element is formed;

an auxiliary wire formed on the drive circuit substrate to be spaced apart from the first electrode;

a light emitting layer formed above the first electrode, the light emitting layer containing a light emitting substance;

a second electrode formed above the light emitting layer; and

an intermediate layer provided between the first electrode and the second electrode,

the intermediate layer and the second electrode extend from above the first electrode to above the auxiliary wire, and

the intermediate layer on the auxiliary wire has a resistance value R ip that satisfies the following relationship:

R ip ≤(R 2p −R bp )×M×(M+1)/2, where one of the pixels that is located farthest from the power feeding line is defined as a first pixel disposed in a position corresponding to an Mth pixel from the power feeding line, a resistance value of the second electrode per pixel is represented by R 2p , and a resistance value of the auxiliary wire per pixel is represented by R bp .

2. The display device according to claim 1 ,

wherein an amount of voltage drop when the power supply voltage is transmitted from the power feeding line to the first pixel via the auxiliary wire is less than or equal to an amount of voltage drop when the power supply voltage is transmitted from the power feeding line via the second electrode without passing through the auxiliary wire.

3. The display device according to claim 1 ,

wherein the resistance value R ip of the intermediate layer further satisfies the following relationship:

R ip >(R 2p −R bp )×N×(N+1)/2, where one of the pixels that is located near the power feeding line is defined as a second pixel disposed in a position corresponding to an Nth pixel from the power feeding line.

4. The display device according to claim 3 ,

wherein an amount of voltage drop when the power supply voltage is transmitted from the power feeding line to the second pixel via the auxiliary wire is greater than an amount of voltage drop when the power supply voltage is transmitted from the power feeding line via the second electrode without passing through the auxiliary wire.

5. The display device according to claim 1 ,

wherein the light emitting element is an organic electroluminescent (EL) element, and

the intermediate layer is at least one of the light emitting layer, a positive hole transport layer that assists in transport of positive holes to the light emitting layer, a positive hole injection layer that injects the positive holes to the light emitting layer, an electron transport layer that assists in transport of electrons to the light emitting layer, and an electron injection layer that injects the electrons to the light emitting layer.

6. The display device according to claim 1 ,

wherein the first electrode and the light emitting layer are spacedly provided in each of the pixels, and

the auxiliary wire is disposed at least for each pixel column or each pixel row.

7. The display device according to claim 6 ,

wherein the pixels each include at least three sub-pixels,

the first electrode and the light emitting layer are spacedly provided in each of the sub-pixels, and

the auxiliary wire is disposed at least for each column of the sub-pixels or each row of the sub-pixels.

8. The display device according to claim 1 ,

wherein the drive circuit substrate includes:

an interlayer insulating layer disposed below the first electrode; and

a driving transistor that is disposed below the interlayer insulating layer and that drives the light emitting element including the light emitting layer, the first electrode, the second electrode, and the intermediate layer,

the first electrode is connected to one of a source and a drain of the driving transistor via a conductive via hole formed in the interlayer insulating layer, and

one terminal of the power supply unit is connected to the other one of the source and the drain of the driving transistor via the power feeding line, and another terminal of the power supply unit is connected to the auxiliary wire via the power feeding line.