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LCD source driver

A technology of source driver and analog converter, which is applied in the field of liquid crystal display source driver, can solve the problems of increasing chip area, achieve low power consumption, improve stabilization time, and small size

Inactive Publication Date: 2010-07-14
DONGBU HITEK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when realizing high resolution of 10 bits or more, 2 N (N is the number of bits) routing and resistors, which rapidly increases the area of ​​the chip

Method used

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Embodiment Construction

[0022] Other advantages, objects and features of the present invention will become more apparent in consideration of the following detailed description with respect to the accompanying drawings. The present invention will be described in detail below.

[0023] In the following, reference will be made to figure 2 as well as Figure 3A and 3B A liquid crystal display (LCD) source driver according to an embodiment of the present invention is described.

[0024] figure 2 is a circuit diagram of an LCD source driver according to one embodiment of the present invention.

[0025] Such as figure 2 As shown, in the present invention, when designing a 10-bit or more source driver, in the use of a sigma-delta digital-to-analog converter (DAC), a module is used to realize the core-DAC (core-DAC) and Analog filter.

[0026] In addition, the settling time of the final output can be improved by adjusting the reference voltage.

[0027] figure 2 The source driver shown in include...

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Abstract

An LCD source driver may include a digital-to-analog converter including a sampling capacitor to sample, according to a signal, at least one of a first voltage and a second voltage. The LCD source driver may also include a reconstruction filter in which capacitance applied from the sampling capacitor according to the signal and capacitance of an integral capacitor for holding a previous output voltage are connected in parallel.

Description

[0001] This application claims priority from Korean Patent Application No. 10-2008-0134209 filed on December 26, 2009, the entire contents of which are hereby incorporated by reference. technical field [0002] The present invention relates to a semiconductor device, and more particularly, to a liquid crystal display (LCD) source driver. Background technique [0003] Generally, a source driver for driving a liquid crystal display (LCD, Liquid Crystal Display) generally uses a resistor string (R-string) digital-to-analog converter (DAC) structure. [0004] However, recently, in order to obtain higher quality, source driver ICs of 10 bits or more have been developed. [0005] R-string DAC implementations up to 8 bits are typically used when implementing existing source drivers. However, when realizing high resolution of 10 bits or more, 2 N (N is the number of bits) routing and resistors, thereby rapidly increasing the area of ​​the chip. [0006] For this reason, a source ...

Claims

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Application Information

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IPC IPC(8): G09G3/36
CPCH03M3/502G09G3/3688G02F1/133G09G3/20G09G3/36
Inventor 林相勋金泰云李信泳高珍硕
Owner DONGBU HITEK CO LTD