US Patent No. 10,117,305

DRIVING SYSTEM AND METHOD FOR PLANAR ORGANIC ELECTROLUMINESCENT DEVICE


Patent No. 10,117,305
Issue Date October 30, 2018
Title Driving System And Method For Planar Organic Electroluminescent Device
Inventorship Hsuan-Yu Lin, Changhua County (TW)
Cheng-Yen Tsai, Keelung (TW)
Sue-Chen Liao, Taichung (TW)
Assignee Industrial Technology Research Institute, Hsinchu (TW)

Claim of US Patent No. 10,117,305

1. A driving system for a planar organic electroluminescent device, comprising:the planar organic electroluminescent device having a plurality of light emitting elements, and each of the light emitting elements comprising a light source and a driving circuit board disposed on a side of the light source, the light source having a first electrode and a second electrode, and the driving circuit board comprising a sheet resistance, wherein the sheet resistance forms a portion of a voltage divider generating a divided output voltage;
a first circuit, connected to the first electrode of each of the light emitting elements and providing a constant voltage to each of the light emitting elements;
a second circuit, connected to the second electrode of each of the light emitting elements, wherein the first circuit and the second circuit are mechanically separated and spaced apart from one another;
a driving module, connected to the second electrode of each of the light emitting elements through the second circuit, wherein the sheet resistance is electrically connected to the driving module, the divided output voltage is provided by the voltage divider, and the driving module determine a constant current value based on the divided output voltage; and
a ground circuit, connected to the driving module, and the ground circuit connects each of the light emitting elements to the ground,
wherein the first electrodes of the light emitting elements are connected to one another, and the light emitting elements are driven by the constant current output by the driving module.