Display device and manufacturing method thereof
A display device is provided to have an emission spectrum. The emission spectrum is performed in a white image of highest grey level and includes a first sub emission spectrum ranging from 380 nm to 478 nm and a second sub emission spectrum ranging from 479 nm to 780 nm, and the first sub emission spectrum has a maximum peak wavelength greater than or equal to 453 nm. An integral value of the first sub emission spectrum multiplied by a blue light hazard weighting function from 380 nm to 478 nm is defined as a first integration, and an integral value of the second sub emission spectrum multiplied by an eye function from 479 nm to 780 nm is defined as a second integration. A ratio of the first integration to the second integration is in a range from 40% to 65%.
1. A display device having an emission spectrum,
wherein the emission spectrum is performed in a white image of highest grey level,
wherein the emission spectrum comprises a first sub emission spectrum ranging from 380 nm to 478 nm and a second sub emission spectrum ranging from 479 nm to 780 nm, and the first sub emission spectrum having a maximum peak wavelength greater than or equal to 453 nm,
wherein an integral value of the first sub emission spectrum multiplied by a blue light hazard weighting function from 380 nm to 478 nm is defined as a first integration, and an integral value of the second sub emission spectrum multiplied by an eye function from 479 nm to 780 nm is defined as a second integration,
wherein a ratio K of the first integration to the second integration is in a range from 40% to 65%,
wherein an equation representing calculation of the ratio K is shown as below:
K
=
∫
380
478
Φ
(
λ
)
B
(
λ
)
d
λ
∫
479
780
Φ
(
λ
)
Y
(
λ
)
d
λ
,
and
wherein λ is a wavelength, Φ(λ) is the emission spectrum, B(λ) is the blue light hazard weighting function, and Y(λ) is the eye function.
2. The display device as claimed in claim 1 , wherein the display device comprising a backlight unit and a display panel.
3. The display device as claimed in claim 1 , wherein the display device comprising a plurality of inorganic light emitting elements.
4. The display device as claimed in claim 1 , wherein the display device comprising a plurality of organic light emitting elements.
5. The display device as claimed in claim 1 , wherein the white image has a white point, an x value of the white point in the CIE 1931 xy chromaticity diagram is in a range from 0.29 to 0.34, a y value of the white point in the CIE 1931 xy chromaticity diagram is in a range from 0.305 to 0.355.
6. The display device as claimed in claim 1 , wherein a ratio of an integral value of the emission spectrum from 415 nm to 455 nm to an integral value of the emission spectrum from 400 nm to 500 nm is less than 50%.
7. The display device as claimed in claim 1 , wherein the maximum peak wavelength of the first sub emission spectrum is less than or equal to 478 nm.
8. The display device as claimed in claim 1 , wherein the display device comprises a blue light emitting element for generating a blue light and a light converting layer for converting the blue light into a yellow light, and the blue light and the yellow light are mixed into a white light.
9. The display device as claimed in claim 8 , wherein the first sub emission spectrum further comprises a maximum peak at the maximum peak wavelength, wherein a ratio of an intensity of a peak of the emission spectrum from 480 nm to 580 nm to an intensity of the maximum peak is in a range from 40% to 60%.
10. The display device as claimed in claim 1 , wherein the display device comprises a blue light emitting element for generating a blue light and a light converting layer disposed on the blue light emitting element, the light converting layer comprises two light converting materials for respectively converting the blue light into a red light and converting the blue light into a green light, and the blue light, the red light and the green light are mixed into a white light.
11. The display device as claimed in claim 10 , wherein the first sub emission spectrum further comprises a maximum peak at the maximum peak wavelength, wherein a ratio of an intensity of a peak of the emission spectrum from 480 nm to 580 nm to an intensity of the maximum peak is in a range from 45% to 70%.
12. The display device as claimed in claim 1 , wherein the display device comprises a blue color filter having a transmission spectrum, the transmission spectrum has another maximum peak wavelength equal to or greater than 453 nm.
13. The display device as claimed in claim 1 , wherein the display device comprises a blue light emitting element having another emission spectrum, and the another emission spectrum has another maximum peak wavelength greater than or equal to 453 nm and less than or equal to 478 nm.
14. A manufacturing method of a display device, comprising:
providing a backlight unit; and
providing a display panel disposed corresponding to the backlight unit,
wherein an emission spectrum is performed by the display device in a white image of highest grey level,
wherein the emission spectrum comprises a first sub emission spectrum ranging from 380 nm to 478 nm and a second sub emission spectrum ranging from 479 nm to 780 nm, and the first sub emission spectrum has a maximum peak wavelength greater than or equal to 453 nm,
wherein an integral value of the first sub emission spectrum multiplied by a blue light hazard weighting function from 380 nm to 478 nm is defined as a first integration, and an integral value of the second sub emission spectrum multiplied by an eye function from 479 nm to 780 nm is defined as a second integration,
wherein a ratio K of the first integration to the second integration is in a range from 40% to 65%,
wherein an equation representing calculation of the ratio K is shown as below:
K
=
∫
380
478
Φ
(
λ
)
B
(
λ
)
d
λ
∫
479
780
Φ
(
λ
)
Y
(
λ
)
d
λ
,
and
wherein λ is a wavelength, Φ(λ) is the emission spectrum, B(λ) is the blue light hazard weighting function, and Y(λ) is the eye function.
15. The manufacturing method of the display device as claimed in claim 14 , wherein the backlight unit comprises at least one blue light emitting element for generating a blue light and a light converting layer covering the blue light emitting element, an input light is emitted from the light converting layer, the display panel comprises a color filter layer, and the color filter layer converts the input light into an output light with the emission spectrum.
16. The manufacturing method of the display device as claimed in claim 14 , wherein the light converting layer comprises a light converting material for converting the blue light into a yellow light.
17. The manufacturing method of the display device as claimed in claim 14 , wherein the light converting layer comprises two light converting materials for respectively converting the blue light into a red light and converting the blue light into a green light.
18. The manufacturing method of the display device as claimed in claim 14 , wherein the display panel comprises a blue color filter having a transmission spectrum, and the transmission spectrum has another maximum peak wavelength greater than 453 nm.
19. A manufacturing method of a display device, comprising:
providing a base; and
forming a plurality of light emitting elements on the base,
wherein an emission spectrum is performed by the display device in a white image of highest grey level,
wherein the emission spectrum comprises a first sub emission spectrum ranging from 380 nm to 478 nm and a second sub emission spectrum ranging from 479 nm to 780 nm, and the first sub emission spectrum has a maximum peak wavelength greater than or equal to 453 nm,
wherein an integral value of the first sub emission spectrum multiplied by a blue light hazard weighting function from 380 nm to 478 nm is defined as a first integration, and an integral value of the second sub emission spectrum multiplied by an eye function from 479 nm to 780 nm is defined as a second integration,
wherein a ratio K of the first integration to the second integration is in a range from 40% to 65%,
wherein an equation representing calculation of the ratio K is shown as below:
K
=
∫
380
478
Φ
(
λ
)
B
(
λ
)
d
λ
∫
479
780
Φ
(
λ
)
Y
(
λ
)
d
λ
,
and
wherein λ is a wavelength, Φ(λ) is the emission spectrum, B(λ) is the blue light hazard weighting function, and Y(λ) is the eye function.
20. The manufacturing method of the display device as claimed in claim 19 , wherein the light emitting elements comprises a blue light emitting element for generating a blue light, a red light emitting element for generating a red light and a green light emitting element for generating a green light, and the blue light, the red light and the green light are mixed into an output light with the emission spectrum.