Display device, display module, electronic device, and television device

A display device comprising:

• a first light-emitting device;
• and
• a second light-emitting device,
• wherein the first light-emitting device comprises a first electrode and a common electrode,
• wherein the second light-emitting device comprises a second electrode and the common electrode,
• wherein the first light-emitting device comprises a hole-injection layer, a first hole-transport layer, a first light-emitting layer, and an electron-transport layer in this order from a side of the first electrode,
• wherein the second light-emitting device comprises a second light-emitting layer between the second electrode and the common electrode,
• wherein the hole-injection layer is in contact with the first electrode,
• wherein the hole-injection layer comprises a first compound and a second compound,
• wherein the first light-emitting layer comprises a third compound that emits light of a first color,
• wherein the second light-emitting layer comprises a fourth compound that emits light of a second color,
• wherein the electron-transport layer comprises a fifth compound,
• wherein the first hole-transport layer comprises a sixth compound,
• wherein the first compound comprises at least one of a cyano group and a fluoro group,
• wherein a HOMO level of the second compound is higher than or equal to −5.7 eV and lower than or equal to −5.4 eV,
• wherein a HOMO level of the fifth compound is higher than or equal to −6.0 eV,
• wherein a HOMO level of the sixth compound is lower than or equal to the HOMO level of the second compound, and
• wherein a difference between the HOMO level of the sixth compound and the HOMO level of the second compound is 0.2 eV or less.

A display device comprising:

• a first light-emitting device;
• a second light-emitting device;
• and
• a third light-emitting device,
• wherein the first light-emitting device comprises a first electrode and a common electrode,
• wherein the second light-emitting device comprises a second electrode and the common electrode,
• wherein the third light-emitting device comprises a third electrode and the common electrode,
• wherein the first light-emitting device comprises a hole-injection layer, a first light-emitting layer, and an electron-transport layer in this order from a side of the first electrode,
• wherein the second light-emitting device comprises a second light-emitting layer between the second electrode and the common electrode,
• wherein the third light-emitting device comprises a third light-emitting layer between the third electrode and the common electrode,
• wherein the hole-injection layer is in contact with the first electrode,
• wherein the hole-injection layer comprises a first compound and a second compound,
• wherein the electron-transport layer comprises a third compound,
• wherein the first compound comprises at least one of a cyano group and a fluoro group,
• wherein a HOMO level of the second compound is higher than or equal to −5.7 eV and lower than or equal to −5.4 eV,
• wherein a maximum peak wavelength of an emission spectrum of the first light-emitting device is shorter than a maximum peak wavelength of an emission spectrum of the second light-emitting device,
• wherein the maximum peak wavelength of the emission spectrum of the second light-emitting device is shorter than a maximum peak wavelength of an emission spectrum of the third light-emitting device, and
• wherein in a top view, an area of a light-emitting region of the first light-emitting device is larger than or equal to an area of a light-emitting region of the third light-emitting device and smaller than or equal to an area of a light-emitting region of the second light-emitting device.