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Power supply circuit and display device including the same

A technology of power supply circuit and input power supply, which is applied in the direction of output power conversion devices, electrical components, and conversion equipment without intermediate conversion to AC, which can solve the problems of difficult semiconductor circuit implementation and difficult miniaturization.

Inactive Publication Date: 2010-09-01
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a DC-DC converter requires an inductance element, so it is not easy to miniaturize, and it is difficult to realize it as a semiconductor circuit

Method used

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  • Power supply circuit and display device including the same
  • Power supply circuit and display device including the same
  • Power supply circuit and display device including the same

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Experimental program
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Embodiment Construction

[0066] Embodiments of the present invention will be described below with reference to the drawings.

[0067]

[0068] figure 1 It is a block diagram showing a schematic configuration of a power supply circuit according to an embodiment of the present invention. This power supply circuit is composed of a positive-side power supply circuit 11 functioning as a charge-pump type step-up power supply circuit and a negative-side power supply circuit 12 generating a negative power supply voltage, and has external terminals for respectively receiving a first voltage applied from the outside. 1st input terminal and 2nd input terminal Ti1, Ti2 of 1 clock signal and 2nd clock signal DCK1, DCK1B; Power supply terminal Tdd for receiving the positive power supply voltage VDD as the input power supply voltage applied from the outside; Wire connection, a ground terminal Tss for receiving a ground voltage VSS as a reference potential of an input power supply voltage; an output terminal To f...

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Abstract

A power supply circuit including a charge pump boost section which does not cause threshold reduction even if only N-channel type transistors are used as switching elements. Control signals to be given to gate terminals of transistors (Q1, Q3) and (Q2, Q4) connected respectively to one ends of capacitors (C1) and (C2) in a boost section (11a) are generated in a drive section (11b). Clock signals (DCK2, DCK2B) whose voltages alternately change between -VDD and VDD are given, as signals obtained by shifting the levels of clock signals (DCK1, DCK1B) to be given to the other ends of the capacitors (C1, C2), to input terminals (Ti3, Ti4) connected to capacitors (C3, C4) of the drive section (11b) (VDD is an input power supply voltage from outside). Thus, the drive section (11b) generates signals whose voltages alternately change between VDD and 3VDD as the control signals.

Description

technical field [0001] The present invention relates to a power supply circuit, and more specifically, to a power supply circuit including a booster for boosting a power supply voltage by a charge pump method, and a driver monolithic display device including such a power supply circuit. Background technique [0002] Conventionally, a DC-DC converter that boosts a power supply voltage using an inductor is known. However, since such a DC-DC converter requires an inductance element, miniaturization is not easy, and it is difficult to realize it as a semiconductor circuit. Therefore, in the case of boosting the power supply voltage in a portable device such as a mobile phone or an integrated circuit, a charge pump circuit composed of a capacitor and a switching element (for example, refer to Patent Document 1 (Japanese Unexamined Patent Application Publication No. 10-285911) is used. )). [0003] For example, a liquid crystal display device installed in a mobile phone or the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07
CPCH02M3/073
Inventor 辻野幸生西修司村上祐一郎佐佐木宁业天诚二郎
Owner SHARP KK
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