Liquid crystal panel, liquid crystal display, and driving method thereof

• US 8,228,274 B2
• Filed: 12/16/2008
• Issued: 07/24/2012
• Est. Priority Date: 06/30/2008
• Status: Active Grant

• Current Assignee: Infovision Optoelectronics Company Limited (Digital China Information Service Co., Ltd.)
• Original Assignee: Infovision Optoelectronics Company Limited (Digital China Information Service Co., Ltd.)
• Inventors: Chung, Te-Chen, Liao, Chia-Te, Chiu, Yu-wen
• Primary Examiner(s): Wong, K.
• Application Number:
  US12/335,536
• Publication Number:
  US 20090322660A1
• Time in Patent Office: 1,316 Days
• Field of Search: None
• US Class Current: 345/87
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• 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

A liquid crystal panel, a liquid crystal display, and a driving method thereof are disclosed. The liquid crystal panel comprises scanning lines, data lines, and a plurality of pixels, each of the plurality of pixels including a TFT, a pixel electrode, a first common electrode, and a second common electrode. The first common electrodes of first pixels of the plurality of pixels are electrically connected via a first common line, the first common electrodes of second pixels of the plurality of pixels are electrically connected via a second common line, and the second common electrodes of the plurality of pixels are electrically connected.

Claims

1. A liquid crystal display (LCD) including a liquid crystal panel that comprises scanning lines, data lines, and a plurality of pixels, each of the plurality of pixels including a thin film transistor (TFT), a pixel electrode, a first common electrode, and a second common electrode, wherein:

the plurality of pixels comprises a first set of pixels and a second set of pixels;

the first common electrodes of first pixels of the first set of pixels are electrically connected and configured to receive a first common voltage signal, and the first common electrodes of second pixels of the first set of pixels are electrically connected and configured to receive a second common voltage signal;

the first common electrodes of first pixels of the second set of pixels are electrically connected and configured to receive a fourth common voltage signal, and the first common electrodes of second pixels of the second set of pixels are electrically connected and configured to receive a fifth common voltage signal;

the second common electrodes of the plurality of pixels being electrically connected; and

the first and second common voltage signals are AC voltage signals, and have reverse polarities in a same frame; and

the fourth and fifth common voltage signals are AC voltage signals, and have reverse polarities in a same frame.

2. The LCD of claim 1, wherein the first and fourth common voltage signals have different timings, and the second and fifth common voltage signals have different timings.

3. A driving method of a liquid crystal display (LCD), the LCD including a liquid crystal panel comprising scanning lines, data lines, and a plurality of pixels, the plurality of pixels comprising first pixels and second pixels, each pixel comprising a thin film transistor (TFT), a pixel electrode, a first common electrode and a second common electrode, the second common electrodes of the plurality of pixels being electrically connected, wherein the first common electrodes of the first pixels of the plurality of pixels are electrically connected, the first common electrodes of the second pixels of the plurality of pixels are electrically connected, and the driving method comprises:

applying data signals to the data lines;

before the TFTs are turned on, inputting to the first common electrodes of the first pixels a first common voltage signal that has the same polarity as the data signal inputted to the first pixels, and inputting to the first common electrodes of the second pixels a second common voltage signal that has the same polarity as the data signal inputted to the second pixels and that has a polarity reverse from the first common voltage signal; and

inputting a third common voltage signal to the second common electrodes of the first and second pixels.

4. The driving method of the LCD of claim 3, wherein at a predetermined time that is earlier than when the TFTs are turned on, the first common voltage signal is inputted to first common electrodes of the first pixels, and the second common voltage signal is inputted to the first common electrodes of the second pixels, the predetermined time being larger than a charging time by which a pixel is changed from the minimum voltage to the maximum voltage.