Display front panel device

1 . A pixel structure of a display device panel stack, comprising:

a first panel, comprising a plurality of ultraviolet light sources disposed on a backplane, wherein the plurality of ultraviolet light sources comprise individually addressable light emitting diodes; and

a second panel, coupled with the first panel, the second panel having an inner surface facing the ultraviolet light sources, wherein the plurality of ultraviolet light sources and the inner surface of the second panel are separated by a distance of at least 2 μm and less than 20 μm, the second panel comprising:

a plurality of subpixels;

a pixel defining structure disposed within the second panel to separate the plurality of subpixels from each other, wherein the pixel defining structure extends from the inner surface of the second panel to contact the backplane of the first panel;

a visibly transparent substrate; and

a down-conversion layer disposed overlying the visibly transparent substrate, the down-conversion layer configured to down-convert ultraviolet light into visible light.

2 . The pixel structure of claim 1 , wherein the down-conversion layer comprises a plurality of quantum dots disposed in a visibly transparent matrix.

3 . The pixel structure of claim 1 , wherein the plurality of subpixels comprises:

a first sub-pixel configured to down-convert ultraviolet light into visible light in a blueish spectral range;

a second sub-pixel configured to down-convert ultraviolet light into visible light in a greenish spectral range; and

a third sub-pixel configured to down-convert ultraviolet light into visible light in a reddish spectral range.

4 . The pixel structure of claim 3 , wherein the pixel defining structure further separates the plurality of ultraviolet light sources, and wherein:

a first light source of the plurality of ultraviolet light sources is configured to illuminate the first sub-pixel;

a second light source of the plurality of ultraviolet light sources is configured to illuminate the second sub-pixel; and

a third light source of the plurality of ultraviolet light sources is configured to illuminate the third sub-pixel.

5 . A method of forming a pixel structure of a display device panel stack, the method comprising:

forming a down-conversion panel comprising a plurality of sub-pixels, the plurality of sub-pixels configured to down-convert ultraviolet light into a plurality of visible wavelength bands;

forming a pixel defining structure on the down-conversion panel, the pixel defining structure defining the plurality of sub-pixels; and

disposing a light array panel overlying the down-conversion panel, the light array panel comprising a plurality of individually addressable ultraviolet light sources,

wherein an inner surface of the down-conversion panel is separated from the plurality of individually addressable ultraviolet light sources by a distance of at least 2 μm, and the pixel defining structure extends from the inner surface of the down-conversion panel to contact the light array panel.

6 . The method of claim 5 , wherein the distance is less than 20 μm.

7 . The method of claim 5 , wherein forming the down-conversion panel comprises:

forming a color filter layer overlying a transparent substrate in each sub-pixel of the plurality of sub-pixels;

forming an ultraviolet blocking layer overlying the color filter layer in each sub-pixel of the plurality of sub-pixels;

forming a down-conversion layer overlying the ultraviolet blocking layer in each sub-pixel of the plurality of sub-pixels, the down-conversion layer configured to down-convert ultraviolet light into visible light.

8 . The method of claim 7 , wherein forming the down-conversion layer comprises:

depositing a first uncured matrix comprising a first plurality of quantum dots into a first subset of the plurality of sub-pixels, the first plurality of quantum dots selected to down-convert ultraviolet light into blueish visible light;

depositing a second uncured matrix comprising a second plurality of quantum dots into a second subset of the plurality of sub-pixels, the second plurality of quantum dots selected to down-convert ultraviolet light into greenish visible light;

depositing a third uncured matrix comprising a third plurality of quantum dots into a third subset of the plurality of sub-pixels, the third plurality of quantum dots selected to down-convert ultraviolet light into reddish visible light; and

curing the down-conversion layer.

9 . The method of claim 8 , wherein forming the down-conversion panel comprises:

disposing an encapsulation layer overlying the down-conversion layer, wherein the inner surface of the down-conversion panel is formed by an outer surface of the encapsulation layer.

10 . The method of claim 7 , wherein forming the pixel defining structure comprises forming a black matrix defining the plurality of sub-pixels.

11 . The method of claim 10 , further comprising depositing a reflective film overlying the black matrix, the reflective film being reflective of visible light.

12 . A pixel structure of a display device panel stack, comprising:

a first panel, comprising a plurality of ultraviolet light sources disposed on a backplane, the plurality of ultraviolet light sources being individually addressable; and

a second panel, coupled with the first panel, the second panel having an inner surface facing the ultraviolet light sources, the second panel comprising:

a transparent substrate;

a pixel defining structure defining a plurality of sub-pixels on the transparent substrate, wherein the pixel defining structure comprises a reflective film disposed on a black matrix; and

a down-conversion layer overlying the transparent substrate in each sub-pixel, the down-conversion layer comprising a phosphor material of a plurality of phosphor materials configured to down-convert ultraviolet light into visible light,

wherein the plurality of ultraviolet light sources and the inner surface of the second panel are separated by a distance of at least 2 μm and less than 20 μm.

13 . The pixel structure of claim 12 , wherein the transparent substrate comprises glass.

14 . The pixel structure of claim 12 , wherein:

for a first subset of the plurality of sub-pixels, the phosphor material is configured to down-convert ultraviolet light into blueish visible light;

for a second subset of the plurality of sub-pixels, the phosphor material is configured to down-convert ultraviolet light into greenish visible light; and

for a third subset of the plurality of sub-pixels, the phosphor material is configured to down-convert ultraviolet light into reddish visible light.