Backlight unit, display device, and electronic device

A display device comprising:

• an element substrate;
• a backlight unit overlapping with the element substrate, the backlight unit comprising:
• a light source portion comprising a plurality of zonal light source regions;
• and
• an optical system between the element substrate and the light source portion,
• wherein each of the plurality of zonal light source regions comprises a plurality of light sources of a plurality of colors,
• wherein the plurality of light sources are arranged in matrix,
• wherein one of the plurality of zonal light source regions is configured to emit a first light in a period, and a region adjacent to the one of the plurality of zonal light source regions is configured to emit a second light in the period,
• wherein a color of the first light is different from a color of the second light, and
• wherein the optical system is configured to narrow a distribution of intensity of a light emitted from each of the plurality of zonal light source regions in a minor-axis direction in any one of the plurality of zonal light source regions.

A backlight unit comprising:

• a light source portion comprising a plurality of light source regions;
• and
• an optical system adjacent to the light source portion, the optical system comprising a lens,
• wherein each of the plurality of light source regions comprises a plurality of light sources of a plurality of colors,
• wherein the plurality of light sources are arranged in matrix,
• wherein the lens is configured to narrow a distribution of intensity of a light emitted from each of the plurality of light source regions in a longitudinal direction of each of the plurality of light source regions,
• wherein the plurality of light source regions include a first light source region, a second light source region, a third light source region between the first light source region and the second light source region, and
• wherein the first light source region, the second light source region, the third light source region are configured to emit lights of different colors in the plurality of colors from each other in the same period.