Display panel

1. A display panel, comprising:

an excitation light emitting unit;

a wavelength conversion unit which contains quantum dots; and

only one glass substrate,

wherein excitation light coming from the excitation light emitting unit enters into the wavelength conversion unit, a wavelength of the excitation light is converted into a needed wavelength for image display by the wavelength conversion unit, and then the excitation light exits from the glass substrate;

wherein both the excitation light emitting unit and the wavelength conversion unit are arranged at a same side of the glass substrate;

wherein the wavelength conversion unit is provided directly on the glass substrate and the excitation light emitting unit is provided directly on the wavelength conversion unit;

wherein the glass substrate is provided with an ultraviolet absorption film at one surface thereof far from the excitation light emitting unit.

2. The display panel according to claim 1 , wherein the excitation light emitting unit and the wavelength conversion unit both have a layered structure.

3. The display panel according to claim 2 , wherein the wavelength conversion unit comprises a quantum dot diaphragm that is affixed on the glass substrate.

4. The display panel according to claim 3 , wherein the quantum dot diaphragm comprises a red quantum dot diaphragm which can emit red light, a green quantum dot diaphragm which can emit green light, and a blue quantum dot diaphragm which can emit blue light.

5. The display panel according to claim 4 , wherein a diameter of a quantum dot in the quantum dot diaphragm ranges from 2 nm to 20 nm.

6. The display panel according to claim 4 , wherein the quantum dot diaphragm is divided into a plurality of pixels, and at least one pixel comprises three sub pixels corresponding to the red quantum dot diaphragm, the green quantum dot diaphragm, and the blue quantum dot diaphragm respectively.

7. The display panel according to claim 4 , wherein the quantum dot comprises a core part arranged at a center thereof, a shell part arranged outside the core part, and an organic ligand arranged outside the shell part.

8. The display panel according to claim 1 , wherein the excitation light is ultraviolet having a wavelength in a range from 100 nm to 400 nm.

9. The display panel according to claim 8 ,

wherein the excitation light emitting unit comprises an anode electrode layer, an electron-hole injection layer, an electron-hole transmission layer, an organic ultraviolet-emitting layer, an electron transmission layer, an electron injection layer, and a cathode electrode layer that are arranged in sequence adjacent to the quantum dot diaphragm; and

wherein a voltage can be applied between the anode electrode layer and the cathode electrode layer.