Liquid crystal display

• US 8,576,149 B2
• Filed: 05/19/2011
• Issued: 11/05/2013
• Est. Priority Date: 05/09/2011
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Zhao, Dengxia
• Primary Examiner(s): HALEY, JOSEPH R
• Application Number:
  US13/145,909
• Publication Number:
  US 20120287107A1
• Time in Patent Office: 901 Days
• Field of Search: None
• US Class Current: 345/87
• CPC Class Codes: G09G 2300/043 Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
• CPC Class Codes: G09G 2300/0852 being a dynamic memory with more than one capacitor
• 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 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 3/3666 with the matrix divided into sections

Abstract

This invention discloses an LCD which includes an LCD panel and a pixel voltage adjuster. The LCD panel includes a plurality of pixel units which are arranged in the way of a matrix. Each pixel unit is provided with a liquid crystal capacitor. The liquid crystal capacitor includes a pixel electrode and a common electrode oppositely arranged. The pixel voltage adjuster receives a feedback common voltage from the common electrode and adjusts the voltage of the pixel electrode in terms of the feedback common voltage. The LCD provided in this invention can reduce cross-noise and improve the display quality of the LCD.

Claims

1. An LCD comprising:

a LCD panel comprising a plurality of pixel units which are arranged in matrix, each pixel unit being provided with a liquid crystal capacitor, the liquid crystal capacitor comprising a pixel electrode and a common electrode oppositely arranged;

a pixel voltage adjuster comprising a plurality of compensation capacitors and a unity gain amplifier, each pixel unit being provided with one of the compensation capacitors, the compensation capacitor comprising one of the pixel electrodes and a feedback common electrode oppositely arranged, the unity gain amplifier comprising an input end connected with the common electrode and an output end connected with the feedback common electrode.

2. The LCD as claimed in claim 1, the LCD panel further comprising:

a plurality of scanning lines and a plurality of data lines, the scanning lines and data lines are cross-set in an insulating way to define the pixel units, each pixel unit comprises a thin film transistor comprising;

a gate electrode connected with one of the scanning lines;

a source electrode connected with one of the data lines; and

a drain electrode connected with the pixel electrode.

3. The LCD as claimed in claim 2, wherein each pixel unit further comprises a storage capacitor, the storage capacitor comprises one of the pixel electrodes and a storage electrode oppositely arranged, the storage electrode and the common electrode are configured to receive the same common voltage.

4. The LCD as claimed in claim 3, wherein the LCD further comprises a common voltage generator configured to provide a common voltage to the storage electrode and the common electrode.

5. The LCD as claimed in claim 3, wherein the LCD further comprises a scanning driver configured to provide scanning signals to the scanning lines.

6. The LCD as claimed in claim 3, wherein the LCD further comprises a data driver which is configured to provide grayscale voltage to data lines.

7. The LCD as claimed in claim 1, wherein the capacitance of the compensation capacitor is twice as much as that of the liquid crystal capacitor.

8. The LCD as claimed in claim 1, wherein a size of the LCD which size is smaller or equal to 32 inches.

9. An LCD comprising:

a LCD panel comprising a plurality of pixel units which are arranged in matrix, each pixel unit being provided with a liquid crystal capacitor, the liquid crystal capacitor comprising a pixel electrode and a common electrode oppositely arranged, wherein the LCD further comprises a pixel voltage adjuster which receives a feedback common voltage from the common electrode and is configured to adjusts the voltage of the pixel electrode in terms of the feedback common voltage;

wherein each pixel unit further comprises a storage capacitor, the storage capacitor comprises a pixel electrode and a storage electrode oppositely arranged, and wherein the storage electrode and the common electrode are configured to receive the same common voltage;

the pixel voltage adjuster comprises a plurality of compensation capacitors and two unity gain amplifiers, each pixel unit is provided with one of the compensation capacitors, the compensation capacitor comprises one of the pixel electrodes and a feedback common electrode oppositely arranged, the LCD comprises two parts which are vertically symmetrical to form an upper part and a lower part, wherein the input end of a first unity gain amplifier is connected with the common electrode of every pixel unit on the upper part, and the output end is connected with the feedback common electrode of every pixel unit on the upper part; and

the input end of a second unity gain amplifier is connected with the common electrode of every pixel unit on the lower part, and the output end is connected with the feedback common electrode of the compensation capacitor in every pixel unit on the lower part.

10. The LCD as claimed in claim 9, wherein the LCD panel further comprises a plurality of scanning lines and data lines which are cross-set in an insulating way to define the pixel units, each pixel unit comprises a thin film transistor comprising a gate electrode connected with one of the scanning lines;

a source electrode connected with one of the data lines; and

a drain electrode connected with the pixel electrode.

11. The LCD as claimed in claim 10, wherein the LCD further comprises a common voltage generator configured to provide common voltage to storage electrode and common electrode.

12. The LCD as claimed in claim 10, wherein the LCD further comprises a scanning driver configured to provide scanning signals to scanning lines.

13. The LCD as claimed in claim 10, wherein the LCD further comprises a data driver configured to provide grayscale voltage to data lines.

14. The LCD as claimed in claim 9, wherein the capacitance of the compensation capacitor is twice as much as that of the liquid crystal capacitor.

15. The LCD as claimed in claim 9, wherein a size of the LCD is larger than 32 inches.

16. The LCD as claimed in claim 9, wherein a size of the LCD is between 37 inches and 40 inches.