Display device and light source module having high color conversion efficiency thereof
A light source module includes a lighting structure, a light diffusing layer, a wavelength converting layer, and a cover plate. The lighting structure includes a plurality of light emitting elements that are all blue-light emitting elements. The light diffusing layer is disposed on the lighting structure, the wavelength converting layer is disposed on the light diffusing layer, and the cover plate is disposed on the wavelength converting layer.
1. A light source module, comprising:
a lighting structure including a substrate and at least three blue-light emitting elements, wherein the substrate has a first region, a second region adjacent to the first region, and a third region adjacent to the second region, and the blue-light emitting elements are respectively disposed in the first region, the second region, and the third region;
a light diffusing layer disposed on the lighting structure, wherein the light diffusing layer contains light diffusing particles, the content of the light diffusing particles is 5% by weight to 25% by weight based on the total weight of the light diffusing layer, and the light diffusing particles are titanium dioxide particles having a mean particle size between 20 nm and 70 nm;
a wavelength converting layer disposed on the light diffusing layer, wherein the wavelength converting layer includes a first converting layer disposed in the first region, a second converting layer disposed in the second region, and a transparent layer disposed in the third region, a blue light generated from one of the blue-light emitting elements and emitted from the first region is converted to a red light via the first converting layer, and a blue light generated from another one of the blue-light emitting elements and emitted from the second region is converted to a green light via the second converting layer;
a cover plate disposed on the wavelength converting layer; and
a blue-light reflecting layer disposed on the cover plate and covering the first converting layer and the second converting layer.
2. The light source module according to claim 1 , wherein the first converting layer contains red phosphors, the second converting layer contains green phosphors, and the transparent layer is formed from a silicone resin.
3. The light source module according to claim 1 , wherein the cover plate is a glass cover plate.
4. The light source module according to claim 3 , wherein the glass cover plate has a first surface proximate to the wavelength converting layer and a second surface opposite to the first surface, and the blue-light reflecting layer is formed on the first surface.
5. The light source module according to claim 3 , wherein the glass cover plate has a first surface proximate to the wavelength converting layer and a second surface opposite to the first surface, and the blue-light reflecting layer is formed on the second surface.
6. The light source module according to claim 1 , wherein each of the blue-light emitting elements is a blue LED chip for generating a blue light having a wavelength between 360 nm and 450 nm.
7. The light source module according to claim 1 , wherein the wavelength converting layer further includes a first light shielding layer and a second light shielding layer, the first light shielding layer is disposed between the first converting layer and the second converting layer, the second light shielding layer is disposed between the second converting layer and the transparent layer, and the first light shielding layer and the second light shielding layer jointly form a black matrix.
8. A display device comprising a plurality of light source modules according to claim 1 .
9. The display device according to claim 8 , wherein the first converting layer contains red phosphors, the second converting layer contains green phosphors, and the transparent layer is formed from a silicone resin.
10. The display device according to claim 8 , wherein the cover plate is a glass cover plate.
11. The display device according to claim 10 , wherein the glass cover plate has a first surface proximate to the wavelength converting layer and a second surface opposite to the first surface, and the blue-light reflecting layer is formed on the first surface.
12. The display device according to claim 10 , wherein the glass cover plate has a first surface proximate to the wavelength converting layer and a second surface opposite to the first surface, and the blue-light reflecting layer is formed on the second surface.
13. The display device according to claim 8 , wherein each of the blue-light emitting elements is a blue LED chip for generating a blue light having a wavelength between 360 nm and 450 nm.
14. The display device according to claim 8 , wherein the wavelength converting layer further includes a first light shielding layer and a second light shielding layer, the first light shielding layer is disposed between the first converting layer and the second converting layer, the second light shielding layer is disposed between the second converting layer and the transparent layer, and the first light shielding layer and the second light shielding layer jointly form a black matrix.