Charge pump circuit in TFT driving circuit

Abstract

The invention describes a programming charge pump circuit of obtaining the different voltage and especially simultaneously produces the positive and negative voltages; its circuit diagram saw the abstract attached figure. This invention through the minority electric capacity sigal output node to achieve the different output voltage goal, simultaneously separately may altogether use the electric capacity when produces positive and negative voltage. This invention electric charge pumps may use in the highpressure integrated circuit chip, it has realized the low power loss, high efficiency, And may act according to the actual request to expand this circuit structure to the need voltage. This invention electric charge pumps has the modular construction and agility remove match function and can achieve the programmable output voltage value through the control logic control clock succession. This electric charge pumps effectiveness lie in its structure used less electric capacities, and reasonable used level transfer circuit produce the high voltage through less progressions. This electric charge pump's low power loss lie in designs used the non- overlap succession to greatest degree reduce direct current to arrive the place path.

Description

technical field [0001] The most common application of charge pump circuits is in the design of erasable programmable read-only memory circuits. So far, charge pump and voltage multiplication technology have been successfully applied in the design of low-voltage and low-power analog integrated circuits in LCD / TFT / OLED design. This invention is relevant to LCD circuits and in particular to LCD driver designs that provide multilayer voltage converters in high voltage CMOS processes through programmable digital logic. Background technique [0002] As technology approaches to nanometers, analog circuit design must face the challenge of lowering voltage. Many LCD designs have to use high voltages internally to meet the LCD material requirements. Therefore, on-chip charge pumps and voltage multipliers become an integral part of low-voltage analog and digital circuit designs. As shown in Figure 1, the driving circuit of TFT (Thin Film Transistor). In order to make the TFT panel ...

AI Technical Summary

Problems solved by technology

But unfortunately, as the input voltage decreases, Vφ decreases and Vd will limit the output voltage

Therefore, Dickson voltage pumps are not suitable for low pressure operation

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