Display device and head mount display device
A display device comprising: a substrate; a plurality of display elements disposed on the substrate; and a diffraction pattern layer disposed on a path of light emitted from the plurality of display elements. The diffraction pattern layer comprises a plurality of diffraction patterns which is disposed with a predetermined pitch, and the plurality of diffraction patterns do not overlap the plurality of display elements; and when a width of a cross section of each of the plurality of diffraction patterns is defined as a length of each diffraction pattern, the predetermined pitch and the length of each diffraction pattern satisfy the following inequation: 0.4≤d1/DP1<1, where DP1 denotes the predetermined pitch, and d1 denotes the length of each diffraction pattern.
1. A display device comprising:
a substrate;
a plurality of display elements disposed on the substrate;
a pixel definition film including a plurality of openings which overlaps the plurality of display elements;
an encapsulation layer disposed on the plurality of display elements and the pixel definition film; and
a diffraction pattern layer disposed on a path of light emitted from the plurality of display elements,
wherein
the diffraction pattern layer comprises a plurality of diffraction patterns which is disposed with a predetermined pitch,
the plurality of diffraction patterns does not overlap the plurality of openings,
the plurality of diffraction patterns is disposed on the encapsulation layer,
a width of a cross section of each of the plurality of diffraction patterns is defined as a length of each diffraction pattern, and
the predetermined pitch and the length of each diffraction pattern satisfy the following inequation:
0.4≤ d 1/ DP 1<1,
wherein DP 1 denotes the predetermined pitch, and d 1 denotes the length of each diffraction pattern.
2. The display device of claim 1 , wherein
a region which overlaps the plurality of display elements is defined as a display region,
a region which does not overlap the plurality of display elements is defined as a non-display region, and
the plurality of diffraction patterns is disposed only in the non-display region.
3. The display device of claim 1 , further comprising:
an encapsulation layer disposed between the plurality of display elements and the plurality of diffraction patterns.
4. The display device of claim 3 , wherein the encapsulation layer includes a glass insulating substrate or at least one of an organic layer and an inorganic layer.
5. The display device of claim 3 , wherein the plurality of diffraction patterns diffract the light emitted from the plurality of display elements, and generate a reference light emission pattern and a replicated light emission pattern.
6. The display device of claim 5 , wherein luminance of the replicated light emission pattern is 3% or greater of luminance of the reference light emission pattern.
7. The display device of claim 5 , wherein
a distance between the reference light emission pattern and the replicated light emission pattern is defined as a diffraction distance,
a distance between each of the plurality of display elements and a corresponding one of the plurality of diffraction patterns is defined as a separation distance, and
the diffraction distance satisfies the following equation:
β
=
Z
·
tan
[
sin
-
1
(
λ
DP
1
·
1
n
170
)
]
,
wherein β denotes the diffraction distance, Z denotes the separation distance, DP 1 denotes the predetermined pitch, λ denotes a wavelength of the light emitted from the plurality of display elements, and n 170 denotes a refractive index of the encapsulation layer.
8. The display device of claim 5 , wherein
the plurality of display elements include a first display element and a second display element, which display a same color as each other, and
a distance between the first display element and the second display element is defined as a distance between the display elements,
a distance between the reference light emission pattern and the replicated light emission pattern is defined as a diffraction distance, and
the distance between the display elements and the diffraction distance satisfy the following inequation: 0.1≤β/PP 1 ≤1.9, wherein PP 1 denotes the distance between the display elements, and β denotes the diffraction distance.
9. The display device of claim 1 , wherein
the diffraction pattern layer further includes a protective layer disposed on the plurality of diffraction patterns,
the plurality of diffraction patterns has a first refractive index,
the protective layer has a second refractive index different from the first refractive index, and
the first refractive index, the second refractive index and a thickness of one of the plurality of diffraction patterns satisfy the following inequation:
( m ×λ)−60 nanometers≤ A ≤( m ×λ)+60 nanometers, and A≠Δn·t 1,
wherein A denotes a value in nanometer, Δn denotes an absolute value of the difference of n 1 and n 2 , n 1 denotes the first refractive index, n 2 denotes the second refractive index, t 1 denotes the thickness of the one of the plurality of diffraction patterns, λ denotes a wavelength of the light emitted from the plurality of display elements, and m is an integer of 0 or greater.
10. A display device comprising:
a substrate;
a plurality of pixel electrodes disposed on the substrate;
a pixel definition film disposed on the plurality of pixel electrodes, wherein a plurality of openings is defined in the pixel definition film to expose at least portions of the plurality of pixel electrodes;
a plurality of organic light-emitting diodes disposed on the plurality of pixel electrode, wherein the plurality of organic light-emitting diodes overlaps the plurality of openings;
an encapsulation layer disposed on the plurality of organic light-emitting diodes and the pixel definition film; and
a diffraction pattern layer comprising a plurality of diffraction patterns disposed on a path of light emitted from the plurality of organic light-emitting diodes with a predetermined pitch,
wherein
a region which overlaps the plurality of openings is defined as a display region,
a region disposed in a periphery of the display region is defined as a non-display region,
the plurality of diffraction patterns is disposed in the non-display region,
the plurality of diffraction patterns is disposed on the encapsulation layer,
a width of a cross section of each of the plurality of diffraction patterns is defined as a length of each diffraction pattern, and
the predetermined pitch and the length of each diffraction pattern satisfy the following inequation: 0.4≤d 1 /DP 1 <1, wherein DP 1 denotes the predetermined pitch, and d 1 denotes the length of each diffraction pattern.
11. The display device of claim 10 , wherein the plurality of diffraction patterns is not disposed in the display region.
12. The display device of claim 10 , wherein the plurality of diffraction patterns do not overlap the plurality of organic light-emitting diodes.
13. The display device of claim 10 , further comprising:
an encapsulation layer disposed between the plurality of organic light-emitting diodes and the diffraction pattern layer,
wherein the encapsulation layer includes a glass insulating substrate or at least one of an organic layer and an inorganic layer.
14. The display device of claim 10 , wherein
the plurality of diffraction patterns diffract the light emitted from the plurality of organic light-emitting diodes and generate a reference light emission pattern and a plurality of replicated light emission patterns, and
luminance of at least one of the plurality of replicated light emission patterns is 3% or more of luminance of the reference light emission pattern.
15. A head mount display device comprising:
a display unit comprising a plurality of display elements and a plurality of diffraction patterns disposed on a path of light emitted from the plurality of display elements; and
a lens unit disposed on a path of light emitted from the display unit,
wherein
the plurality of diffraction patterns is disposed with a predetermined pitch and do not overlap the plurality of display elements,
a width of a cross section of each of the plurality of diffraction patterns is defined as a length of each diffraction pattern, and
the predetermined pitch and the length of each diffraction pattern satisfy the following inequation: 0.4≤d 1 /DP 1 <1, wherein DP 1 denotes the predetermined pitch, and d 1 denotes the length of each diffraction pattern.
16. The head mount display device of claim 15 , wherein
a region which overlaps the plurality of display elements is defined as a display region,
a region which does not overlap the plurality of display elements is defined as a non-display region, and
the plurality of diffraction patterns is disposed only in the non-display region.
17. The head mount display device of claim 15 , wherein the plurality of diffraction patterns diffract the light emitted from the plurality of display elements, and generate a reference light emission pattern and a replicated light emission pattern.
18. The head mount display device of claim 17 , wherein
a distance between the reference light emission pattern and the replicated light emission pattern is defined as a diffraction distance,
a distance between each of the plurality of display elements and each of the plurality of diffraction patterns is defined as a separation distance, and
the diffraction distance satisfies the following equation:
β
=
Z
·
tan
[
sin
-
1
(
λ
DP
1
·
1
n
170
)
]
,
wherein β denotes the diffraction distance, Z denotes the separation distance, DP 1 denotes the predetermined pitch, λ denotes a wavelength of the light emitted from the plurality of display elements, and n 170 denotes a refractive index of the encapsulation layer.
19. The head mount display device of claim 17 , wherein
the plurality of display elements include a first display element and a second display element, which display a same color as each other,
a distance between the first display element and the second display element is defined as a distance between the display elements,
a distance between the reference light emission pattern and the replicated light emission pattern is defined as a diffraction distance, and
the distance between the display elements and the diffraction distance satisfy the following inequation: 0.1≤β/PP 1 ≤1.9, wherein PP 1 denotes the distance between the display elements, and β denotes the diffraction distance.
20. The head mount display device of claim 15 , wherein
the display unit further includes a protective layer disposed on the plurality of diffraction patterns to cover the plurality of diffraction patterns,
the plurality of diffraction patterns have a first refractive index, and the protective layer has a second refractive index different from the first refractive index, and
the first refractive index, the second refractive index, and a thickness of one of the plurality of diffraction patterns satisfy the following inequation:
( m ×λ)−60 nanometers≤ A ≤( m ×λ)+60 nanometers, and A≠Δn·t 1,
wherein, A denotes a value in nanometer, Δn denotes an absolute value of a difference of n 1 and n 2 , n 1 denotes the first refractive index, n 2 denotes the second refractive index, t 1 denotes the thickness of one of the plurality of diffraction patterns, λ denotes a wavelength of the light emitted from the plurality of display elements, and m is an integer of 0 or greater.