Light-emitting device
View Patent ↗A light-emitting device includes a current source module having a first transistor, a first voltage control module providing a negative voltage and a second voltage control module having a second transistor. The second voltage control module is electrically connected to the current source module and the first voltage control module.
1. A light-emitting device, comprising:
a current source module comprising a first transistor, and a Zener diode electrically connected to the first transistor in series;
a first voltage control module; and
a second voltage control module electrically connected to the current source module and the first voltage control module, and comprising a second transistor.
2. The light-emitting device according to claim 1 , wherein the first voltage control module further comprises a negative voltage-doubler.
3. The light-emitting device according to claim 2 , wherein the negative voltage-doubler is consisted of two capacitors and two diodes.
4. The light-emitting device according to claim 1 , wherein the second transistor has a first end connected to the first voltage control module, and a second end connected to the first transistor.
5. The light-emitting device according to claim 1 , wherein the second transistor is a HEMT.
6. The light-emitting device according to claim 5 , wherein the second transistor has a gate end connected to the first voltage control module, and a drain end connected to the first transistor.
7. The light-emitting device according to claim 1 , wherein the first voltage control module further comprises a buffer portion, the buffer portion is connected to the second voltage control module.
8. The light-emitting device according to claim 1 , wherein the first transistor is configured to operate in a saturation region and the second transistor is configured to operate in a linear region.
9. A light-emitting device, comprising:
a current source module comprising a first transistor;
a first voltage control module comprising a negative voltage-doubler; and
a second voltage control module electrically connected to the current source module and the first voltage control module, and comprising a second transistor.
10. The light-emitting device according to claim 9 , further comprising a Zener diode electrically connected to the first transistor and the second voltage control module.
11. The light-emitting device according to claim 9 , wherein the negative voltage-doubler is consisted of two capacitors and two diodes.
12. The light-emitting device according to claim 9 , wherein the second transistor has a first end connected to the first voltage control module, and a second end connected to the first transistor.
13. The light-emitting device according to claim 9 , wherein the second transistor is a depletion mode HEMT.
14. The light-emitting device according to claim 13 , wherein the second transistor has a gate end connected to the first voltage control module, and a drain end connected to the first transistor.
15. The light-emitting device according to claim 9 , wherein the first voltage control module further comprises a buffer portion, the buffer portion is connected to the second voltage control module.