Apparatus and method of driving data of liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9685125-B2
Application number	US-96768807-A
Country	US
Kind code	B2
Filing date	Dec 31, 2007
Priority date	Aug 29, 2007
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

An apparatus and method of driving data of a liquid crystal display device is disclosed, which can minimize an electromagnetic interference EMI noise by decreasing an output peak current of a data driver, the apparatus comprising a timing controller for supplying a reference source output enable signal; a delay circuit for delaying the reference source output enable signal and supplying a plurality of source output enable signals provided with the different delay times; and a data driver, including a plurality of data ICs to divide and drive data lines of a liquid crystal panel into a plurality of data blocks, for dispersing data output timing of the plurality of data ICs in response to the plurality of source output enable signals.

First claim

What is claimed is:

1. A data driving apparatus of liquid crystal display device comprising:
a timing controller that supplies a reference source output enable signal;
a delay circuit that delays the reference source output enable signal and supplies a plurality of source output enable signals with respective delay times; and
a data driver comprising a first data driver and a second data driver, each respectively including a plurality of data ICs to divide and drive data lines of a liquid crystal panel into a plurality of data blocks, which disperses data output timing of the plurality of data ICs in response to the plurality of source output enable signals,
wherein:
the delay circuit comprises a first plurality of delaying parts-configured to delay the reference source output enable signal supplied to the data ICs of the first data driver by respective delay times,
the delay circuit further comprises a second plurality of delaying parts configured to delay the reference source output enable signal supplied to the data ICs of the second data driver by said respective delay times,
the reference source output enable signal and the plurality of source output enable signals have respective rising times and respective falling times such that a peak current of the data driver is dispersed and decreased corresponding to the respective delay times of the plurality of source output enable signals,
the delaying parts are connected to a supply line which supplies the reference source output enable signal from the timing controller to the data ICs,
the delaying parts directly delay the reference source output enable signal from the timing controller with the respective delay times to control a data output period of each of the plurality of data ICs by being connected to the supply line of the reference source output enable signal, and further output the delayed reference source output enable signals with the respective delay times as the plurality of source output enable signals, and
each of the source output enable signals controls the data output period of each of the plurality of data ICs.

2. The apparatus of claim 1 , wherein the delaying parts are provided with time constants set with the same delay time value.

3. The apparatus of claim 1 , wherein the plurality of data ICs are supplied with the plurality of output enable signals in a sequential order where the delay time is increased gradually as becoming more distant from the timing controller.

4. The apparatus of claim 1 , wherein the delaying parts delay the reference source output enable signal with respective delay times.

5. The apparatus of claim 4 , wherein each of the delaying parts comprises resistive (R) and capacitive (C) components, and at least one of the R and C components is differently set in the respective delaying parts so as to configure the plurality of delaying parts with the respective delay times.

6. The apparatus of claim 4 , wherein the plurality of data ICs are supplied with the plurality of source output enable signals having the respective delay times which are sequentially increased or decreased.

7. The apparatus of claim 1 , wherein the delay circuit is mounted on a PCB substrate connected between the timing controller and the data driver, or is formed in each of the data ICs.

8. The apparatus of claim 7 , wherein each of the delaying parts comprises resistive (R) and capacitive (C) components, and at least one of the R and C components of the respective delaying parts is mounted on the PCB substrate connected between the timing controller and the data driver, and the other component is formed in each of the data ICs.

9. The apparatus of claim 1 , wherein each of the delaying parts comprises resistive (R) and capacitive (C) components, at least one of the R and C components of the respective delaying parts is formed in the liquid crystal device.

10. The apparatus of claim 9 , wherein the C component of the delaying parts is formed in each of the corresponding data ICs.

11. The apparatus of claim 1 , wherein the first plurality of delaying parts delays the reference source output enable signal supplied through a first supply line and the second plurality of delaying parts delays the reference source output enable signal supplied through a second supply line.

12. The apparatus of claim 11 , wherein the delaying parts of first plurality are connected to the first supply line in parallel, and the delaying parts of second plurality are connected to the second supply line in parallel.

13. A data driving apparatus of liquid crystal display device comprising:
a timing controller that generates a reference source output enable signal and supplies the generated reference source output enable signal to first and second supply lines;
a first data driver, including a plurality of data ICs, for division-driving data lines included in a first region of a liquid crystal panel;
a second data driver, including a plurality of data ICs, for division-driving data lines included in a second region of the liquid crystal panel;
a first PCB substrate connected between the timing controller and the first data driver;
a second PCB substrate connected between the timing controller and the second data driver;
a first delay circuit, mounted on the first PCB substrate, for dispersing data output timing of the first data driver by delaying the reference source output enable signal supplied from the first supply line; and
a second delay circuit, mounted on the second PCB substrate, for dispersing data output timing of the second data driver by delaying the reference source output enable signal supplied from the second supply line,
wherein:
the first and second delay circuits are configured to output a plurality of source output enable signals based on the reference source output enable signal delayed by respective delay times;
the reference source output enable signal and the plurality of source output enable signals have different rising times and different falling times such that peak currents of the first and second data driver are dispersed and decreased corresponding to different delay times of the reference source output enable signal;
the first delay circuit includes a plurality of delaying parts connected to the first supply line, the first delay circuit is configured to delay the reference source output enable signal by respective delay times;
the second delay circuit includes a plurality of delaying parts connected to the second supply line, the second delay circuit is configured to delay the reference source output enable signal by said respective delay times of the first delay circuit; and
the plurality of delaying parts of the first delay circuit and the second delay circuit directly delay the reference source output enable signal from the timing controller with the respective delay times to control a data output period of each of the plurality of data ICs.

14. The apparatus of claim 13 , wherein each of the plurality of delaying parts of the first delay circuit has a different time constant;
and each of the plurality of delaying parts of the second delay circuit has a different time constant that matches the time constant of corresponding delaying part of the first delay circuit.

15. The apparatus of claim 14 , wherein the data output timing of the respective data ICs of the first data driver is dispersed at a constant time difference, and the data output timing of the respective data ICs of the second data driver is dispersed at a constant time difference.

16. The apparatus of claim 15 , wherein the time difference of da

Assignees

• Ha Sung Chul
• Cho Chang Hun
• Hong Jin Cheol
• Lg Display Co Ltd

Inventors

• Ha Sung Chul
• Cho Chang Hun
• Hong Jin Cheol

Classifications

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G2330/06

  Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation · CPC title

• G09G2370/08

  Details of image data interface between the display device controller and the data line driver circuit · CPC title

• G09G3/3611 Primary

  Control of matrices with row and column drivers · CPC title

• G02F1/133

  Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements (arrangements or circuits for control of liquid crystal elements in a matrix, not structurally associated with these elements G09G3/36) · CPC title