Source-driving circuit, display apparatus and operation method thereof

• US 8,605,067 B2
• Filed: 12/01/2011
• Issued: 12/10/2013
• Est. Priority Date: 12/17/2010
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Chen, Jen-Chieh, Hsu, Chao-Ching, Li, Ching-Lin
• Primary Examiner(s): Boddie, William
• Assistant Examiner(s): ONYEKABA, AMY
• Application Number:
  US13/308,815
• Publication Number:
  US 20120154358A1
• Time in Patent Office: 740 Days
• Field of Search: 345/87, 345/100, 345/204, 345/208, 345/214
• US Class Current: 345/209
• CPC Class Codes: G09G 2310/0224 Details of interlacing
• CPC Class Codes: G09G 2310/0248 Precharge or discharge of column electrodes before or after applying exact column voltages
• CPC Class Codes: G09G 2310/0275 Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current
• CPC Class Codes: G09G 2310/0297 Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
• CPC Class Codes: G09G 2330/023 using energy recovery or conservation
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

A source-driving circuit comprises a plurality of first and second data-outputting units, a first and a second charge-sharing units and a charge-sharing switch circuit. The first and second data-outputting units have corresponding first and second output terminals respectively for outputting data signals with a first polarity and a second polarity. The first and second charge-sharing units comprise a plurality of first and second switches respectively. Each first switch is electrically connected between each two first output terminals and each two second output terminals. Each second switch is electrically connected between one of the first outputting terminals and a corresponding one of the second outputting terminals. A charge-sharing switch circuit is electrically connected to the first and second charge-sharing units for outputting a switch signal to the first and second charge-sharing units according to a polarity signal, so as to determine the on/off statuses of the first and second switches.

Claims

1. A source-driving circuit adapted to a display apparatus, the source-driving circuit comprising:

a plurality of first data-outputting units, having a plurality of corresponding first output terminals respectively for outputting a plurality of data signals with a first polarity;

a plurality of second data-outputting units, having a plurality of corresponding second output terminals respectively for outputting a plurality of data signals with a second polarity;

a first charge-sharing unit, comprising a plurality of first switches, the first switches being divided into two groups, each of the first switches in a first group being electrically connected between two first output terminals, and each of the first switches in a second group being electrically connected between two second output terminals;

a second charge-sharing unit, comprising a plurality of second switches, each of the second switches being electrically connected between a corresponding one of the first output terminals and a corresponding one of the second output terminals; and

a charge-sharing switch circuit, electrically connected to the first charge-sharing unit and the second charge-sharing unit, the charge-sharing switch circuit being configured for outputting a switch signal to the first charge-sharing unit and the second charge-sharing unit according to a polarity signal, so as to determine the on/off statuses of the first switches and the second switches,

wherein the polarity signal is configured for indicating whether the data signals need switching the polarities thereof.

2. The source-driving circuit according to claim 1, wherein each of the first data-outputting units and the second data-outputting units comprises:

a first amplifier, having a first high-voltage terminal electrically connected to a first operation voltage, a first low-voltage terminal electrically connected to a second operation voltage and electrically connected to a ground through a first capacitor, and a first amplifier output terminal electrically connected to a corresponding one of the first output terminals or a corresponding one of the second output terminals and electrically connected to the ground through a second capacitor; and

a second amplifier, having a second high-voltage terminal electrically connected to the first low-voltage terminal, a second low-voltage terminal electrically connected to the ground, and a second amplifier output terminal electrically connected to a corresponding one of the first output terminals or a corresponding one of the second output terminals and electrically connected to the ground through a third capacitor.

3. The source-driving circuit according to claim 2, wherein the potential of the second operation voltage is half of that of the first operation voltage.

13. The source-driving circuit according to claim 1, wherein the charge-sharing switch circuit determines that the polarity signal is in a first status, the charge-sharing switch circuit outputs the switch signal to enable the first switches, so that the first output terminals are connected with each other, and the second output terminals thereof are connected with each other.

14. The source-driving circuit according to claim 1, wherein the charge-sharing switch circuit determines that the polarity signal is in a second status, the charge-sharing switch circuit outputs the switch signal to enable the second switches, so that each of the first output terminals is connected with an adjacent one of the second output terminals.

15. The source-driving circuit according to claim 13, wherein the charge-sharing switch circuit determines that the polarity signal is in the first status when the display apparatus displays a single-color image or a compensation image.

16. The source-driving circuit according to claim 14, wherein the charge-sharing switch circuit determines that the polarity signal is in the second status when the display apparatus displays a color image.

4. A display apparatus, comprising:

a pixel array, composed of a plurality of pixel units arranged in an array, each of the pixel units comprising a plurality of sub-pixel units;

a gate-driving circuit, electrically connected to the pixel array through a plurality of scan lines, each of the scan lines being electrically connected to a part of the sub-pixel units in each row; and

a source-driving circuit, configured for receiving a plurality of polarity signals and having a plurality of first data-outputting terminals and a plurality of second data-outputting terminals, the first data-outputting terminals being divided into a first group, and the second data-outputting terminals being divided into a second group, each of the first data-outputting terminals being electrically connected to a corresponding one of a plurality of data lines for outputting data signals with a first polarity, and each of the second data-outputting terminals being electrically connected to a corresponding other one of a plurality of data lines for outputting data signals with a second polarity, so as to transmit the data signals to the pixel array through the data lines, wherein each of the data lines is further electrically connected to at least a part of the sub-pixel units in two adjacent columns, each of the polarity signals is configured for indicating whether the data signals of a corresponding one of the groups need switching the polarities thereof,

wherein when one of the polarity signals is in a first status at a sampling point, the source-driving circuit makes the first data-outputting terminals in the first group connect with each other and makes the second data-outputting terminals in the second group connect with each other; and

when one of the polarity signals is in a second status at the sampling point, the source-driving circuit makes each of the first data-outputting terminals connect with a corresponding one of the second data-outputting terminals.

5. The display apparatus according to claim 4, wherein each of the groups comprises at least three first data-outputting terminals and at least three second data-outputting terminals, and the first data-outputting terminals and the second data-outputting terminals in each group are interlaced with each other.

6. The display apparatus according to claim 4, wherein the source-driving circuit comprises:

a plurality of first data-outputting units, having corresponding first output terminals respectively, the first output terminals being electrically connected to the first data-outputting terminals respectively for outputting data signals with a first polarity;

a plurality of second data-outputting units, having corresponding second output terminals respectively, the second output terminals being electrically connected to the second data-outputting terminals respectively for outputting data signals with a second polarity;

a plurality of first charge-sharing units, each of the first charge-sharing units comprising a plurality of first switches for electrically connecting the first data-outputting terminals of each of the groups with each other and electrically connecting the second data-outputting terminals of each of the groups with each other;

a plurality of second charge-sharing units, each of the second charge-sharing units comprising a plurality of second switches for electrically connecting each of the first data-outputting terminals to a corresponding one of the second data-outputting terminals;

a plurality of third switches, configured for electrically connecting the first data-outputting terminals and the second data-outputting terminals to the first output terminals and the second output terminals; and

a plurality of charge-sharing switch units, electrically connected to the first charge-sharing units and the second charge-sharing units, each of the charge-sharing switch units being configured for outputting a switch signal to a corresponding one of the first charge-sharing units and a corresponding one of the second charge-sharing units according to one of the polarity signals, so as to determine the on/off statuses of the corresponding first switches and the corresponding second switches.

7. The display apparatus according to claim 6, wherein each of the first data-outputting units the second data-outputting units comprises:

a first amplifier, having a first high-voltage terminal electrically connected to a first operation voltage, a first low-voltage terminal electrically connected to a second operation voltage and electrically connected to a ground through a first capacitor, and a first amplifier output terminal electrically coupled to a corresponding one of the first output terminals or a corresponding one of the second output terminals and electrically connected to the ground through a second capacitor; and

a second amplifier, having a second high-voltage terminal electrically connected to the first low-voltage terminal, a second low-voltage terminal electrically connected to the ground, and a second amplifier output terminal electrically connected to a corresponding one of the first output terminals or a corresponding one of the second output terminal and electrically connected to the ground through a third capacitor.

8. The display apparatus according to claim 7, wherein the potential of the second operation voltage is half of that of the first operation voltage.

9. An operation method for a display apparatus, comprising:

outputting data signals with a first polarity from a plurality of first data-outputting terminals respectively;

outputting data signals with a second polarity from a plurality of second data-outputting terminals respectively, wherein the first data-outputting terminals are divided into a first group, and the second data-outputting terminals are divided into a second groups;

checking the status of at least one polarity signal;

connecting the first data-outputting terminals in the first groups with each other and connecting the second data-outputting terminals in the second group with each other when the polarity signal is in a first status at a sampling point; and

connecting one of the first data-outputting terminals with a corresponding one of the second data-outputting terminals when the polarity signal is in a second status at the sampling point.

10. The operation method according to claim 9, further comprising receiving a display controlling signal.

11. The operation method according to claim 9, wherein when at least a part of an image displayed by the display apparatus operates in a line inversion mode, the polarity signal corresponding to the part of the image operating in the line inversion mode is in the first status.

12. The operation method according to claim 9, wherein when at least a part of an image displayed by the display apparatus operates in a dot inversion mode, the polarity signal corresponding to the part of the image operating in the dot inversion mode is in the second status.