Display device and method for manufacturing display device

1. A display device comprising:

a display panel including a plurality of pixels each having a color filter,

a color separation element configured to disperse light from a light source and to emit, to the display panel, a plurality of rays of separated light with wavelengths different from each other;

a light source emitting light and disposed under the color separation element; and

an outer adhesive portion that bonds a side surface of the display panel and the color separation element to each other over an entire perimeter of the display panel,

wherein

the color separation element is larger than the display panel in plan view, and is disposed between the display panel and the light source, and

the color separation element is configured to:

separate the light emitted from the light source for each wavelength corresponding to a color of each color filter; and

cause the separated light with the each wavelength corresponding to the color filter to enter and be transmitted through the color filter.

2. The display device according to claim 1 , further comprising an inner adhesive portion containing a gap member of a given size, the inner adhesive portion bonding the display panel and the color separation element to each other inside of the outer adhesive portion in plan view.

3. The display device according to claim 2 , wherein

the display panel has a display region where an image is displayed, and

the inner adhesive portion is around the display region in plan view.

4. The display device according to claim 2 , wherein the inner adhesive portion has a discontinuous portion where a basic material is discontinuous.

5. The display device according to claim 1 , wherein the outer adhesive portion is formed by a one-part adhesive.

6. A method for manufacturing a display device, the method comprising:

applying a first adhesive containing a gap member of a given size to a board surface of a display panel;

sticking together a board surface of a color separation element and the board surface of the display panel to which the first adhesive has been applied, with the first adhesive between the board surfaces, the board surface of the color separation element dispersing light from a light source and emitting a plurality of rays of separated light with wavelengths different from each other; and

applying a second adhesive to the color separation element and the display panel, which have been stuck to each other with the first adhesive, over an entire perimeter of the display panel from a side surface of the display panel to the color separation element, outside of the first adhesive in plan view, wherein

the display panel includes a plurality of pixels each having a color filter,

the color separation element is larger than the display panel in plan view, and is disposed between the display panel and the light source, and

the color separation element is configured to:

separate the light emitted from the light source for each wavelength corresponding to a color of each color filter; and

cause the separated light with the each wavelength corresponding to the color filter to enter and be transmitted through the color filter.

7. The method for manufacturing a display device according to claim 6 , wherein at the sticking together the color separation element and the display panel, the gap member is sandwiched by the board surface of the color separation element and the board surface of the display panel.

8. The display device according to claim 1 , wherein

the pixels include a first pixel, a second pixel, and a third pixel,

the color separation element has a separation region that emits the separated light,

in the separation region, a front surface of the color separation element has an uneven shape, the front surface including a first range, a second range, and the third range, and

the uneven shape of the color separation element is such that:

first separated light gathers in the first pixel from the first range that is larger than the first pixel in plan view and that overlaps the first pixel in plan view;

the second separated light gathers in the second pixel from the second range that is larger than the second pixel in plan view and that overlaps the second pixel in plan view; and

the third separated light gathers in the third pixel from the third range that is larger than the third pixel in plan view and that overlaps the third pixel in plan view.