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Data driver and display device

A data driver and driver technology, applied in the field of data drivers and display devices, can solve the problems of terminal potential fluctuation, stable output signal, large noise of output signal, etc., and achieve the effect of reducing area, reducing capacitance value, and saving area

Inactive Publication Date: 2013-05-08
RENESAS ELECTRONICS CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when amplifying voltage signals of different levels corresponding to output and image data according to each output period, there are the following problems: Figure 14 When the capacitance value of the operational amplifier is switched, large noise is generated in the output signal due to the charge and discharge of the connected capacitor, or the potential change of the terminal through the connected capacitor, etc.
Especially when the state switching is performed in a short time, there is a possibility that the Figure 12 (B) The problem of stabilizing the output signal during T1 or T2)

Method used

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Embodiment Construction

[0079] The above-mentioned present invention will be further described in detail below with reference to the accompanying drawings.

[0080] figure 1 It is a figure which shows the structure of 1st Embodiment of this invention. figure 1 It is a figure showing the structure of the output buffer of the data driver of a liquid crystal display device.

[0081] In this embodiment, an amplifier circuit (refer to Figure 12 In (A)), a control circuit 20 for controlling the resistance value of the zero-point compensation resistor R1 is provided.

[0082] The amplifier circuit according to this embodiment includes: a current source M15 whose first terminal is connected to the low-order side power supply VSS; and a differential pair composed of N-channel transistors M11 and M12 whose common source is connected to the second terminal of the current source M15. (denoted as differential pair (M11, M12)) A current mirror (denoted as current mirror (M13, M14)) P-channel transistor M16,...

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Abstract

Disclosed is a data driver including a zero compensation resistor connected in series with a phase compensation capacitor between an output node of an input differential amplification stage and an output node of a succeeding amplification stage, and a control circuit that controls to switch a resistance value of the zero compensation resistor. The control circuit switches the resistance value of the zero compensation resistor to a first resistance value or a second resistance value larger than the first resistance value in response to turning off or on of an output switch that controls connection between the output terminal of an amplifying circuit and a data line.

Description

technical field [0001] The invention relates to a data driver and a display device using the data driver. Background technique [0002] Recently, in addition to mobile phones (mobile-phones, cellular-phones), notebook computers, and monitors, the demand for large-screen liquid crystal televisions has also expanded. These liquid crystal display devices use active matrix drive type liquid crystal display devices that can perform high-definition display. First, refer to Figure 11 A typical structure of a liquid crystal display device of an active matrix driving method will be described. In addition, in Figure 11 In , the main structure connected to one pixel of the liquid crystal display unit is schematically shown by an equivalent circuit. [0003] Generally, the display unit 960 of an active matrix liquid crystal display device is formed by facing two substrates, a semiconductor substrate and an opposite substrate, and sealing liquid crystal therebetween. In pixel column...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36H03F3/45
CPCG09G2310/027G09G3/3688
Inventor 土弘
Owner RENESAS ELECTRONICS CORP
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