Method and apparatus for driving liquid crystal display

• US 6,788,280 B2
• Filed: 11/27/2001
• Issued: 09/07/2004
• Est. Priority Date: 09/04/2001
• Status: Expired due to Term

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Ham, Yong Sung
• Primary Examiner(s): WU, XIAO MIN
• Application Number:
  US09/994,041
• Publication Number:
  US 20030048247A1
• Time in Patent Office: 1,015 Days
• Field of Search: 345/87, 345/88, 345/89, 345/98, 345/99, 345/100, 345/95, 345/96, 345/209, 345/210, 345/690, 345/691
• US Class Current: 345/89
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

The present invention discloses a method and apparatus for driving a liquid crystal display device suitable for enhancing a picture quality. More specifically, in the method and apparatus, source data is modulated based on registered data that is previously provided therein. The modulated data is applied to a liquid crystal panel at the initial period of one frame period. A data different from the modulated data is supplied to the liquid crystal panel at the later period of the frame period.

Claims

1. A method of driving a liquid crystal display, comprising:

modulating source data using registered data previously provided and supplying the modulated data to a liquid crystal panel at an initial period of one frame period; and

applying data different from the modulated data to the liquid crystal panel at a later period of the one frame period, further comprising;

dividing the source data of a current frame period into most significant bit data and least significant bit data;

delaying the most significant bit data for one frame period; and

selecting the modulated data through a comparison of the current and delayed most significant bit data.

2. A method of driving a liquid crystal display, comprising:

modulating source data using registered data previously provided and supplying the modulated data to a liquid crystal panel at an initial period of one frame period; and

applying data different from the modulated data to the liquid crystal panel at a later period of the one frame period, further comprising;

delaying entire bit data of the source data for one frame period; and

selecting the modulated data through a comparison of the current and delayed entire bits of the source data.

3. An apparatus for driving a liquid crystal display, comprising:

a modulator modulating source data using registered data previously provided therein; and

a data provider alternatively applying the modulated data and data different from the modulated data to the liquid crystal panel within one frame period, wherein the modulator comprises,

a delay circuit delaying most significant bit data of the source data of a current frame and outputting one frame delayed most significant bit data; and

a look-up table selecting the registered data through a comparison of the current and delayed most significant bit data.

4. An apparatus for driving a liquid crystal display, comprising:

a modulator modulating source data using registered data previously provided therein; and

a data provider alternatively applying the modulated data and data different from the modulated data to the liquid crystal panel within one frame period, wherein the modulator selects the registered data through a comparison of entire bits of the current and delayed source data.

5. An apparatus for driving a liquid crystal display, comprising:

a modulator modulating source data using registered data previously provided therein; and

a data provider alternatively applying the modulated data and data different from the modulated data to the liquid crystal panel within one frame period, wherein the data provider comprises,

a switch alternatively switching the data and the modulated data;

a timing controller applying the source data to the modulator and controlling a switching time of the switch; and

a line memory holding the data for less than one frame period and outputting the data to the switch.

6. The apparatus according to claim 5, wherein the timing controller generates a switching control signal inverted in a logic value within the one frame period to alternatively switch the modulated data and the source data within the one frame period.

7. The apparatus according to claim 5, wherein the timing controller generates a dot clock at a frequency twice greater than that of the source data to sequentially select the modulated data and the source data within the one frame period.

8. The apparatus according to claim 5, wherein the switch alternatively switches the source data and the modulated data at a half period of the one frame period.

9. A liquid crystal display comprising:

a liquid crystal display panel displaying images and having a plurality of data lines and a plurality of scanning lines thereon;

a modulator modulating source data based on registered data previously provided therein; and

a data provider alternatively applying the modulated source data and the source data to the liquid crystal panel through the data lines within one frame period, wherein the data provider comprises,

a switch alternatively switching the data and the modulated data;

a timing controller applying the source data to the modulator and controlling a switching time of the switch; and

a line memory holding the data for less than one frame period and outputting the data to the switch.