Amplifier and display driver including amplifier

A technology for display drivers and amplifiers, applied in the field of amplifiers, can solve problems such as increased power consumption, and achieve the effect of reducing power consumption

Active Publication Date: 2016-04-06
LAPIS SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in an amplifier employing the PC method as described above, in order to realize high-speed processing, it is necessary to perform precharging at a voltage higher than the gradation voltage, so there is a problem that power consumption increases.

Method used

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  • Amplifier and display driver including amplifier
  • Amplifier and display driver including amplifier
  • Amplifier and display driver including amplifier

Examples

Experimental program
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Embodiment Construction

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0025] figure 1 It is a block diagram showing the configuration of a display device 10 having a data driver 13 including the amplifier of the present invention. figure 1 The shown display device 10 is composed of a drive control unit 11 , a scan driver 12 , a data driver 13 , and a display device 20 made of a liquid crystal or organic EL panel.

[0026] The display device 20 is formed with m (m is a natural number greater than or equal to 2) horizontal scanning lines S each extending in the horizontal direction of the two-dimensional screen. 1 ~S m And each of n (n is a natural number above 2) data lines D extending in the vertical direction of the two-dimensional screen 1 ~D n . Furthermore, in the area of ​​each intersection of the horizontal scanning line and the data line, that is, in figure 1 The area enclosed by the dotted line in , forms the displ...

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PUM

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Abstract

The invention relates to an amplifier and a display driver including an amplifier, aiming to suppress power dissipation and work in high speed. When an amplifier supplies to a drive line a driving signal based on an input voltage corresponding to a data value indicated by input data, and feeds to an output line a current corresponding to a voltage value on the drive line, the amplifier precharges the drive line at start of increase or decrease of the input voltage. Furthermore, the amplifier stops the precharge when the data value indicated by the input data is smaller than a reference value, or when a difference between a data value at present and a data value immediately therebefore in a series of data values indicated by the input data is smaller than a reference difference value.

Description

technical field [0001] The present invention relates to an amplifier, in particular to an amplifier using a precharge method and a display driver including the amplifier. Background technique [0002] A display driver that drives, for example, a liquid crystal display panel as a display device is provided with a plurality of amplifiers that amplify grayscale voltages corresponding to luminance levels indicated by input video signals and drive them as pixels The voltages are respectively applied to the data lines of the liquid crystal display panel. [0003] As such an amplifier for a display driver, an amplifier that achieves high-speed operation by employing a precharge (hereinafter, also referred to as PC) method has been proposed (for example, refer to Patent Document 1). In the PC method, a precharge circuit is provided on the drive line for driving the output amplifier, and the drive line is precharged with a relatively high voltage by the precharge circuit just before...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G3/3688G09G2310/0248G09G2310/0291G09G2330/021
Inventor 渡部五常
Owner LAPIS SEMICON CO LTD
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