Display device
A display device having a wide color gamut includes a backplane, a light emitting group, a protective layer, and a color conversion structure. The light emitting group is disposed on the backplane, and includes a plurality of blue light emitting elements arranged at intervals. The protective layer encapsulates the blue light emitting elements in a lateral direction to expose their light emitting surfaces. The color conversion structure is disposed on the light emitting group to convert light from one portion of the blue light emitting elements into red light and green light and allow light from another one portion of the blue light emitting elements to pass through. The protective layer has a transmittance of 10% or less of light having a wavelength greater than 380 nm and less than 500 nm.
1 . A display device, comprising:
a backplane having a first area, a second area, and a third area arranged at intervals;
a light emitting group disposed on the backplane and including a first blue light emitting element located in the first area, a second blue light emitting element located in the second area, and a third blue light emitting element located in the third area;
a protective layer disposed on the backplane and encapsulating the first blue light emitting element, the second blue light emitting element, and the third blue light emitting element in a lateral direction to expose a light emitting surface of each of the first blue light emitting element, the second blue light emitting element, and the third blue light emitting element, wherein the protective layer includes a yellow absorbing material that is a yellow organic pigment, a yellow inorganic pigment, or a combination thereof; and
a color conversion structure including:
a red conversion unit disposed on the light emitting surface of the first blue light emitting element and including a red conversion sheet and a first blue light-cutoff sheet disposed on the red conversion sheet;
a green conversion unit disposed on the light emitting surface of the second blue light emitting element and including a green conversion sheet and a second blue light-cutoff sheet disposed on the green conversion sheet;
a light-permeable unit disposed on the light emitting surface of the third blue light emitting element; and
a black matrix disposed between the red conversion unit, the green conversion unit, and the light-permeable unit;
wherein both the first blue light-cutoff sheet and the second blue light-cutoff sheet have a transmittance of 10% or less of light having a wavelength greater than 380 nm and less than 500 nm, and the protective layer is a transparent layer; and
wherein each of the first blue light-cutoff sheet and the second blue light-cutoff sheet is formed from a photoresist material, and the photoresist material includes the yellow absorbing material accounting for 5 wt % to 20 wt % of a total weight thereof.
2 . The display device according to claim 1 , wherein the yellow absorbing material is bismuth vanadate (BiVO 4 ).
3 . The display device according to claim 2 , wherein the protective layer is a photoresist layer.
4 . The display device according to claim 1 , wherein the color conversion structure includes a cover board that has an inner surface close to the light emitting group, and the red conversion unit, the green conversion unit, the light-permeable unit, and the black matrix are formed on the inner surface.
5 . The display device according to claim 1 , wherein each of the first blue light emitting element, the second blue light emitting element, and the third blue light emitting element includes a first type semiconductor layer, a second type semiconductor layer, an active layer, and two electrodes, the first type semiconductor layer is close to the backplane, the second type semiconductor layer is close to the color conversion structure, the active layer is disposed between the first type semiconductor layer and the second type semiconductor layer, and the two electrodes are disposed on the first type semiconductor layer to face towards the backplane and electrically connected to the first type semiconductor layer and the second type semiconductor layer, respectively; each of the first area, the second area, and the third area has two connection pads disposed therein, the two electrodes of the first blue light emitting element are respectively and electrically connected to the two connection pads of the first area, the two electrodes of the second blue light emitting element are respectively and electrically connected to the two connection pads of the second area, and the two electrodes of the third blue light emitting element are respectively and electrically connected to the two connection pads of the third area.
6 . The display device according to claim 1 , wherein each of the first blue light emitting element, the second blue light emitting element, and the third blue light emitting element includes a first type semiconductor layer, a second type semiconductor layer, an active layer, and two electrodes; wherein the first type semiconductor layer is close to the color conversion structure, the second type semiconductor layer is close to the backplane, and the active layer is disposed between the first type semiconductor layer and the second type semiconductor layer; wherein one of the two electrodes is disposed on the first type semiconductor layer to face towards the color conversion structure, and the other of the two electrodes is disposed on the second type semiconductor layer to face towards the color conversion structure; and wherein the backplane has a plurality of connection pads disposed thereon that are alternately arranged with the first blue light emitting element, the second blue light emitting element, and the third blue light emitting element, and the two electrodes of the first blue light emitting element, the second blue light emitting element, or the third blue light emitting element are electrically connected to the corresponding two of the connection pads.
7 . The display device according to claim 1 , wherein each of the first blue light emitting element, the second blue light emitting element, and the third blue light emitting element includes a first type semiconductor layer, a second type semiconductor layer, an active layer, and an electrode; wherein the first type semiconductor layer is close to the color conversion structure, the second type semiconductor layer is close to the backplane, the active layer is disposed between the first type semiconductor layer and the second type semiconductor layer, and the electrode is disposed on the second type semiconductor layer to face towards the backplane; and wherein the display device includes a circuit layer disposed on the protective layer, the backplane has a plurality of connection pads disposed thereon, the first type semiconductor layer of the first blue light emitting element, the second blue light emitting element, or the third blue light emitting element is electrically connected to the circuit layer, and the electrode of the first blue light emitting element, the second blue light emitting element, or the third blue light emitting element is electrically connected to the corresponding one of the connection pads.