Display apparatus including voltage compensator to compensate common voltage

• US 8,514,162 B2
• Filed: 10/30/2009
• Issued: 08/20/2013
• Est. Priority Date: 10/30/2008
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Moh, Sang-Moon, Ryu, Han-Jin, Chu, Hong-Sig, Kim, Kwang-Jae, Bae, Sang-Don, Hwang, In-Jae, Moon, Seung-Hwan, Kim, Sang-Soo
• Primary Examiner(s): Nguyen, Chanh
• Assistant Examiner(s): Park, Sanghyuk
• Application Number:
  US12/609,550
• Publication Number:
  US 20100110058A1
• Time in Patent Office: 1,390 Days
• Field of Search: 345 87-104, 345/613, 345694-696
• US Class Current: 345/94
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• 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 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 2330/06 Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
• 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 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A display apparatus includes; a data driver integrated in one chip and which outputs data signals; a gate driver which sequentially outputs gate signals, a display panel which includes; a plurality of data lines which receive the data signals, a plurality of gate lines which receive the gate signals, and a plurality of pixels connected to a corresponding gate line and a corresponding data line, a voltage generator which generates a common voltage and a storage voltage and provides them to the display panel, and a voltage compensator which receives the storage voltage fedback from the display panel and generates a compensation signal, wherein the display panel further includes a feedback line which provides the voltage compensator with the storage voltage, and wherein the feedback line is electrically connected to the voltage compensator through the data driver.

Claims

1. A display apparatus comprising:

a data driver which is integrated in one chip;

a gate driver which sequentially outputs a gate signal;

a display panel comprising;

a data line which receives data signals;

a gate line which receives the gate signal; and

a pixel which is connected to the gate line and the data line;

a voltage generator which generates a common voltage and a storage voltage and provides the display panel with the common voltage and the storage voltage through a common voltage line and a plurality of storage lines, respectively;

a voltage compensator which receives the storage voltage feedback from the display panel and generates a compensation signal to compensate the common voltage based on the feedback storage voltage; and

a feedback line which provides the voltage compensator with the storage voltage, and the feedback line electrically connected to the voltage compensator through the data driver,

wherein the data driver outputs all of the data signals;

wherein the feedback line is electrically connected to a middle position of a storage line that is most adjacent to the one chip among the plurality of storage lines.

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

a printed circuit board which includes the voltage generator and the voltage compensator; and

a flexible printed circuit film which electrically connects the printed circuit board and the display panel.

3. The display apparatus of claim 2, wherein the feedback line extends to the printed circuit board via the flexible printed circuit film and is electrically connected to the voltage compensator through the flexible printed circuit film.

4. The display apparatus of claim 3, wherein the data driver is integrated in the chip which is mounted on the flexible printed circuit film, and the feedback line overlaps the chip on the flexible printed circuit film.

5. The display apparatus of claim 3, wherein the chip is mounted on the display panel and the feedback line overlaps the chip on the display panel.

6. The display apparatus of claim 1, wherein a blank area is provided on a lower surface of the chip corresponding to the feedback line, and the chip comprises a plurality of terminals arranged in a remaining area of the lower surface outside of the blank area.

7. The display apparatus of claim 1, wherein the chip comprises:

first dummy terminals and second dummy terminals electrically connected to the feedback line; and

an interconnection arranged along the chip to electrically connect the first dummy terminal and the second dummy terminal.

8. The display apparatus of claim 1, wherein the display panel further comprises:

at least one common voltage line which receives the common voltage from the voltage generator;

a common electrode which receives the common voltage through the common voltage line; and

a plurality of storage lines which receive the storage voltage from the voltage generator,

wherein the feedback line is electrically connected to at least one of the storage lines.

9. The display apparatus of claim 8, wherein the feedback line branches from a single storage line, which is closest to the chip, among the plurality of storage lines.

10. The display apparatus of claim 8, wherein the compensation signal output from the voltage compensator is applied to the common voltage line and the plurality of storage lines.

11. The display apparatus of claim 1, wherein the storage voltage and the common voltage are direct current voltage signals, and the compensation signal has a phase substantially opposite to a phase of a ripple component of the storage voltage.

12. The display apparatus of claim 11, wherein the voltage compensator comprises:

a capacitor which receives the storage voltage;

a first resistor connected to the capacitor;

an operational amplifier including a reverse input terminal connected to the first resistor, a non-reverse input terminal which receives a reference voltage, and an output terminal which outputs the compensation signal; and

a second resistor connected between the reverse input terminal and the output terminal.

13. A display apparatus comprising:

a data driver which is integrated in one chip;

a gate driver which sequentially outputs gate signals;

a display panel comprising;

a plurality of data lines which receive data signals;

a plurality of gate lines which receive the gate signals; and

a plurality of pixels each of which is connected to a corresponding gate line of the plurality of gate lines and a corresponding data line of the plurality of data lines;

a voltage generator which generates a common voltage and a storage voltage and provides the display panel with the common voltage and the storage voltage through a common voltage line and a plurality of storage lines, respectively;

a voltage compensator which receives the storage voltage feedback from the display panel and generates a compensation signal to compensate the common voltage based on the feedback storage voltage; and

a feedback line which provides the voltage compensator with the storage voltage, the feedback line electrically connected to the voltage compensator through the chip,

wherein the plurality of gate lines extend in a first direction, the plurality of data lines extend in a second direction substantially perpendicular to the first direction, the display panel has a structure wherein a length thereof in the first direction is longer than a length thereof in the second direction, and a number of the plurality of gate lines is more than a number of the plurality of data lines;

wherein the data driver outputs all of the data signals;

wherein the feedback line is electrically connected to a middle position of a storage line that is most adjacent to the one chip among the plurality of storage lines.

14. The display apparatus of claim 13, wherein the gate driver comprises a plurality of amorphous silicon type transistors, which are disposed directly on the display panel and adjacent to a shorter side of the display panel, and wherein the gate driver sequentially scans the plurality of pixels in a pixel row along the shorter side of the display panel, and the chip is arranged adjacent to a longer side of the display panel and outputs the data signals to the plurality of pixels in the pixel row which is scanned by the gate signal.

15. The display apparatus of claim 14, wherein each of the plurality of pixels has a structure wherein a length thereof in the first direction is longer than a length thereof in the second direction.

16. The display apparatus of claim 13, wherein a blank area is provided on a lower surface of the chip corresponding to the feedback line, and the chip comprises a plurality of terminals arranged in a remaining area of the lower surface outside of the blank area.

17. A display apparatus comprising:

a data driver which is integrated in one chip;

a gate driver which sequentially outputs gate signals;

a display panel comprising;

a plurality of data lines which receive data signals;

a plurality of gate lines which receive the gate signals;

a plurality of pixels each of which is connected to a corresponding gate line of the plurality of gate lines and a corresponding data line of the plurality of data lines;

a voltage generator which generates a common voltage and a storage voltage and provides the display panel with the common voltage and the storage voltage through a common voltage line and a plurality of storage lines, respectively;

a voltage compensator which receives the storage voltage feedback from the display panel and generates a compensation signal to compensate the common voltage based on the feedback storage voltage; and

a feedback line which provides the voltage compensator with the storage voltage, the feedback line electrically connected to the voltage compensator through the chip,

wherein the plurality of gate lines extend in a first direction, the plurality of data lines extend in a second direction substantially perpendicular to the first direction, the display panel has a structure wherein a length thereof in the second direction is longer than a length thereof in the first direction, and a number of the plurality of gate lines is more than a number of the plurality of data lines,

wherein the data driver outputs all of the data signals;

wherein the feedback line is electrically connected to a middle position of a storage that is most adjacent to the one chip among the plurality of storage lines.

18. The display apparatus of claim 17, wherein the gate driver comprises a plurality of amorphous silicon type transistors, which are disposed directly on the display panel and adjacent to a longer side of the display panel, and wherein the gate driver sequentially scans the plurality of pixels in a pixel column along the longer side of the display panel, and the chip is arranged adjacent to a shorter side of the display panel and outputs the data signals to the plurality of pixels in the pixel column which is scanned by the gate signal.

19. The display apparatus of claim 18, wherein each of the plurality of pixels has a structure wherein a length thereof in the first direction is longer than a length thereof in the second direction.

20. The display apparatus of claim 18, further comprising a timing controller which controls the gate driver and the data driver, and wherein the timing controller comprises a data converter which converts a first image data sequentially input from an exterior corresponding to a pixel row into a second image data corresponding to the pixel column and sequentially provides the second image data to the data driver.

21. A display apparatus comprising:

a data driver which is integrated in one chip;

a gate driver which sequentially outputs a gate signal;

a display panel comprising;

a plurality of data lines which receives data signals;

a plurality of gate lines which receives the gate signal;

a plurality of storage lines which receives a storage voltage; and

a pixel which is connected to the gate line and the data line;

a voltage generator which generates a common voltage and the storage voltage and provides the display panel with the common voltage and the storage voltage through a common voltage line and the plurality of storage lines, respectively;

a voltage compensator which receives the storage voltage feedback from the display panel and generates a compensation signal to compensate the common voltage based on the feedback storage voltage; and

a feedback line which provides the voltage compensator with the storage voltage, and the feedback line electrically connected to the voltage compensator through the data driver,

wherein the feedback line is disposed between two data lines adjacent to each other and branches from a single storage line, which is closest to the chip, among the plurality of storage lines,

wherein the data driver outputs all of the data signals;

wherein the feedback line is electrically connected to a middle position of a storage line that is most adjacent to the one chip among the plurality of storage lines.