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Analog buffer circuit, display device and mobile terminal

A buffer circuit, display device technology, applied in the field of analog buffer circuits, display devices and portable terminals, can solve the problems of consumption, display quality deterioration, high power supply voltage, etc.

Inactive Publication Date: 2004-12-22
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this greatly deteriorates the display quality (uniformity)
[0005] Also, in the case of forming an analog circuit on an insulating substrate using TFTs, since a high power supply voltage and a large idle current are required for circuit driving, a large absolute value of the TFT threshold Vth results in large power consumption
Therefore, although the driver-integrated structure is established, it is disadvantageous in reducing the power consumption of the display device

Method used

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  • Analog buffer circuit, display device and mobile terminal
  • Analog buffer circuit, display device and mobile terminal
  • Analog buffer circuit, display device and mobile terminal

Examples

Experimental program
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Effect test

no. 1 example

[0046] figure 1 is a circuit diagram showing an example of an N-type buffer analog buffer circuit according to the first embodiment of the present invention. This N-type buffer analog buffer circuit includes an NMOS transistor, and is used when the output signal potential is relatively high, specifically, when the output signal potential is higher than a specific fixed potential PSIG to be described later.

[0047] exist figure 1In this example, the source follower NMOS transistor Qn1 and the current source In1 are connected in series between a first power supply (for example, a positive power supply VDD) and a second power supply (for example, a negative power supply VSS). The switch Sn1 is connected between the circuit input terminal INn1 and the NMOS transistor Qn1. The switch Sn2 and the switch Sn3 are connected in series between the circuit input terminal INn1 and the NMOS transistor Qn1, and the switch Sn4 and the switch Sn5 are also connected in series.

[0048] The ...

no. 2 example

[0082] Figure 17 is a circuit diagram showing an example of an N-type buffer analog buffer circuit according to a second embodiment of the present invention. The N-type buffer analog buffer circuit includes an NMOS transistor, and is used when the output signal potential is relatively high, specifically when the output signal potential is higher than a specific fixed potential PSIG that will be described later.

[0083] exist Figure 17 In this example, an NMOS transistor Qn21 serving as a source follower and a current source In21 are connected in series between a power supply VDD and a power supply VSS. The switch Sn21 is connected between the circuit input terminal INn21 and the gate of the NMOS transistor Qn21. The switch Sn22 and the switch Sn23, the switch Sn24 and the switch Sn25, and the switch Sn26 and the switch Sn27 are connected in series between the circuit input terminal INn21 and the source of the NMOS transistor Qn21.

[0084] The capacitor Cn21 is connected...

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PUM

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Abstract

An analog buffer circuit which has small input and output offsets and reduced power consumption even if it is formed on an insulating substrate by TFTs, a display device which uses the analog buffer circuit as a peripheral driving circuit for a display unit, and a portable terminal in which the display device is provided as a screen display unit are provided. By performing offset detection on a source follower in such a manner that, for example, two capacitors Cn1 and Cn2 are connected to the gate of a NMOS transistor Qn11 as a source follower, and conduction / nonconduction control of switches Sn1 to Sn5 are performed, if needed, and by sequentially canceling the detected offsets, a final offset voltage is sufficiently reduced and high precision offset cancellation is realized.

Description

technical field [0001] The present invention relates to an analog buffer circuit, a display device and a portable terminal, in particular to an analog buffer circuit formed on an insulating substrate by a thin film transistor (TFT), a display device using the analog buffer circuit as a peripheral drive circuit of a display unit, and a display device equipped with A portable terminal having the display device as a screen display unit. Background technique [0002] In recent years, in the field of flat display devices represented by liquid crystal display devices and EL (Electroluminescence) display devices, in order to achieve a narrow planar frame and reduce planar thickness, so-called driver-integrated display devices have been developed, in which the driver -In an integrated display device, on the same transparent substrate having a display unit composed of pixels arranged in a matrix, a peripheral driving circuit for driving the display unit is provided in an integrated f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G09G3/20G09G3/30G09G3/36H03F3/34H03F3/50H03F3/68H03F3/72
CPCG09G2310/0281G09G3/30G09G2310/027G09G2310/0291G09G2330/021H03F3/72G09G3/2011G09G3/3614G09G3/3688H03F3/68H03F2200/375G09G2320/0233G09G2310/0289H03F3/505G09G2310/0248G09G3/36H03F3/50H03M1/74
Inventor 仲岛义晴木田芳利前川敏一
Owner SONY CORP