Driving circuit used for current driving element and luminous device
A technology of current drive and drive circuit, which is applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., and can solve the problem that the load current cannot be supplied back to the voltage source in reverse.
Active Publication Date: 2010-10-20
AU OPTRONICS CORP
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Problems solved by technology
[0003] The power supply voltages OVDD and OVSS of the first terminal and the second terminal of the organic electroluminescence diode 12 are usually positive voltage driving voltage and negative voltage driving voltage respectively, but some applications may require the situation that both ends are positive voltage; If both ends are positive voltage, because the general application of positive voltage is used as a voltage source to provide load current, it cannot provide the function of the load current flowing back to the voltage source (that is, the current draw), so it is necessary to provide the power supply voltage. The drive circuit is redesigned so that it can achieve the function of both voltage regulation and current extraction
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[0047] see figure 2 , which shows a block diagram of a partial structure of a light emitting device related to an embodiment of the present invention. Such as figure 2 As shown, the light emitting device 20 includes a current driving element 22 and a driving circuit 24; wherein, the driving circuit 24 is used to provide a driving voltage to the current driving element 22, and the current driving element 22 can be figure 1 The organic electroluminescent diode shown in , which can control its brightness performance by using a transistor with a storage capacitor, and produces different degrees of brightness according to the magnitude of the current flowing through it.
[0048] The driving circuit 24 includes a power supply circuit 23 and a power supply circuit 25 . Wherein, the power supply circuit 23 is electrically coupled to the first terminal 221 of the current driving element 22 to provide the positive potential OVDD1 to the current driving element 22, where the power su...
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The invention relates to a driving circuit used for a current driving element, and a luminous device, and the driving circuit is suitable for driving the current driving element and comprises a first power supply circuit and a second power supply circuit, wherein the first power supply circuit provides a first positive potential to the first end of the current driving element, the second power supply circuit makes the current flow in the flowing direction of the first current in the first period and sets the second end of the current driving element as a second positive potential, and in the second period, the current flowing out from the current driving element flows out from the second power supply circuit in the flowing direction of the second current. In addition, the flowing direction of the first current and the flowing direction of the second current are different in the second power supply circuit.
Description
technical field [0001] The present invention relates to the field of display technology, and in particular to a driving circuit and a light-emitting device for current-driven elements. Background technique [0002] Organic Light Emitting Diode (OLED) is a current-driven element, which produces different degrees of light according to the magnitude of the current flowing through it; Organic Light Emitting Diodes usually use transistors with storage capacitors to control their brightness performance. See figure 1 , which shows an electrical connection relationship between an organic electroluminescence diode, a transistor, and a storage capacitor in the prior art. Such as figure 1 As shown, the first end of the organic electroluminescent diode 12 is electrically coupled to the power supply voltage OVDD through the driving transistor M1, and the second end of the organic electroluminescent diode 12 is electrically coupled to another power supply voltage OVSS, where , the pow...
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IPC IPC(8): H05B37/02G09G3/3208
Inventor 李佳祐蔡子健
Owner AU OPTRONICS CORP