DISPLAY APPARATUS

• US 20080122775A1
• Filed: 10/30/2007
• Published: 05/29/2008
• Est. Priority Date: 11/23/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Hee-Seop, Yang, Young-Chol, Shin, Seong-Sik, Kim, Sang-Il
• Application Number:
  US11/928,501
• Publication Number:
  US 20080122775A1
• Time in Patent Office: Days
• US Class Current: 345/94
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2300/0447 for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

In a display apparatus, a common electrode receives a common voltage of which a voltage level is inverted at every H/2 period of 1H period during which pixels connected to one row are turned on. A first switching device outputs a first data voltage having a voltage level different from the common voltage during an earlier H/2 period, and a second switching device outputs a second data voltage having a polarity different from the first data voltage during a later H/2 period. First and second pixel electrodes receive the first and second data voltages from the first and second switching devices, respectively. Thus, a liquid crystal voltage applied to a liquid crystal layer increases, thereby improving a response speed of a liquid crystal and reducing a power consumption of the display apparatus.

Claims

1. A display apparatus having a plurality of pixels to display an image,

each of the pixels comprising:

a common electrode receiving a common voltage having a squarewave form;

a first switching device outputting a first data voltage having a voltage level different from a voltage level of the common voltage in response to a first gate signal during an earlier H/2 period among a horizontal scanning period (1H) during which pixels connected to one row are turned on;

a second switching device outputting a second data voltage having a polarity different from a polarity of the first data voltage with reference to the common voltage in response to a second gate signal during a later H/2 period of the 1H period;

a first pixel electrode connected to an output electrode of the first switching device to receive the first data voltage;

a second pixel electrode electrically insulated from the first pixel electrode and connected to an output electrode of the second switching device to receive the second data voltage; and

a liquid crystal layer interposed between the common electrode and the first and second pixel electrodes.

2. The display apparatus of claim 1, wherein the voltage level of the common voltage is changed every H/2 period.

3. The display apparatus of claim 1, wherein a polarity of a first liquid crystal voltage applied to the liquid crystal layer during the earlier H/2 period is opposite to a polarity of a second liquid crystal voltage applied to the liquid crystal layer during the later H/2 period.

4. The display apparatus of claim 3, wherein the first liquid crystal voltage and the second liquid crystal voltage have a same absolute value.

5. The display apparatus of claim 1, wherein the first pixel electrode and the second pixel electrode are spaced apart from each other by a predetermined distance, and the common electrode is positioned in a region corresponding to a location between the first pixel electrode and the second pixel electrode.

6. The display apparatus of claim 5, wherein the common electrode has a width equal to or smaller than the predetermined distance between the first pixel electrode and the second pixel electrode.

7. The display apparatus of claim 5, wherein an opening is formed through the common electrode corresponding to the first pixel electrode and the second pixel electrode, and the common electrode has a width larger than the predetermined distance between the first pixel electrode and the second pixel electrode.

8. The display apparatus of claim 1, further comprising:

a first base substrate; and

a second base substrate facing the first base substrate.

9. The display apparatus of claim 8, wherein the common electrode is arranged on the first base substrate, and the first and second switching devices and the first and second pixel electrodes are arranged on the second base substrate.

10. The display apparatus of claim 9, wherein the first and second pixel electrodes are arranged on a same layer.

11. The display apparatus of claim 8, wherein the common electrode, the first and second switching devices, and the first and second pixel electrodes are arranged on either the first base substrate or the second base substrate.

12. The display apparatus of claim 11, wherein the first and second pixel electrodes are arranged on a same layer, and the common electrode is arranged on a different layer from a layer on which the first and second pixel electrodes are arranged so as to be insulated from the first and second pixel electrodes.

13. The display apparatus of claim 1, wherein each of the pixels further comprises:

a first gate line electrically connected to a control electrode of the first switching device to provide the first gate signal during the earlier H/2 period;

a second gate line electrically connected to a control electrode of the second switching device to provide the second gate signal during the later H/2 period; and

a data line electrically connected to an input electrode of the first switching device and an input electrode of the second switching device to provide the first data voltage and the second data voltage during the earlier H/2 period and the later H/2 period, respectively.