Liquid crystal display apparatus, source driver and method for controlling polarity of driving signals thereof

• US 9,916,797 B2
• Filed: 05/20/2015
• Issued: 03/13/2018
• Est. Priority Date: 01/13/2015
• Status: Active Grant

• Current Assignee: Novatek Microelectronics Corporation (Novatek Microelectronics Corp Limited)
• Original Assignee: Novatek Microelectronics Corporation (Novatek Microelectronics Corp Limited)
• Inventors: Hou, Ching-Wen, Yang, Shun-Hsun, Wu, Tse-Hung
• Primary Examiner(s): Johnson, Gerald
• Application Number:
  US14/716,890
• Publication Number:
  US 20160203779A1
• Time in Patent Office: 1,028 Days
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2370/08 Details of image data interface between the display device controller and the data line driver circuit
• CPC Class Codes: G09G 2370/14 Use of low voltage differential signaling [LVDS] for display data communication
• 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 liquid crystal display apparatus, a source driver, and a method for controlling polarity of driving signals thereof are provided. The source driver includes a signal receiving interface, a decoder, and a controller. The signal receiving interface receives an image data stream or a data input/output indication signal. The decoder obtains polarity controlling information from the image data stream or the data input/output indication signal. The controller receives the polarity controlling information and decides driving polarities of a plurality of source driving signals generated by the source driver according to the polarity controlling information.

Claims

1. A source driver, adapted to a liquid crystal display apparatus, comprising:

a signal receiving interface, receiving a data input/output indication signal;

a decoder, coupled to the signal receiving interface, and decoding the data input/output indication signal to obtain both of polarity controlling information and timing information for the source driver to receive or transmit data; and

a controller, coupled to the decoder, receiving the polarity controlling information, and deciding driving polarities of a plurality of source driving signals generated by the source driver according to the polarity controlling information.

2. The source driver according to claim 1, wherein the signal receiving interface receives the data input/output indication signal from a timing controller or a previous-stage source driver.

3. The source driver according to claim 1, wherein the decoder calculates a starting time point of a data input/output indication pulse of the data input/output indication signal to obtain the polarity controlling information.

4. The source driver according to claim 1, further comprising:

a counter, coupled to the signal receiving interface and the controller, wherein the counter counts the starting time point of the data input/output indication pulse according to a timing signal in order to obtain the polarity controlling information.

5. The source driver according to claim 1, wherein the decoder decodes a signal neighboring to a data input/output indication pulse on the data input/output indication signal to obtain the polarity controlling information.

6. The source driver according to claim 1, further comprising:

an operator, receiving the polarity controlling information and channel quantity information, and calculating the polarity controlling information and the channel quantity information for generating secondary polarity controlling information of a secondary-stage source driver; and

an encoder, coupled to the operator, receiving the secondary-stage polarity controlling information, encoding the secondary-stage polarity controlling information so that the secondary polarity controlling information is mounted on a secondary-stage data input/output indication signal, and transmitting the secondary-stage data input/output indication signal to the secondary-stage source driver.

7. A method for controlling polarities of driving signals of a source driver, adapted to a liquid crystal display apparatus, comprising:

receiving a data input/output indication signal;

decoding the data input/output indication signal to obtain both of polarity controlling information and timing information for the source driver to receive or transmit data; and

deciding driving polarities of the source driving signals of the source driver according to the polarity controlling information.

8. The method for controlling the polarities of the driving signals according to claim 7, wherein the step of receiving the data input/output indication signal comprises:

receiving the data input/output indication signal from a timing controller or a previous-stage source driver.

9. The method for controlling the polarities of the driving signals according to claim 7, wherein the step of obtaining the polarity controlling information from the data input/output indication signal comprises:

calculating a starting time point of a data input/output indication pulse of the data input/output indication signal to obtain the polarity controlling information.

10. The method for controlling the polarities of the driving signals according to claim 7, wherein the step of obtaining the polarity controlling information from the data input/output indication signal comprises:

decoding a signal neighboring to a data input/output indication pulse on the data input/output indication signal to obtain the polarity controlling information.

11. The method for controlling the polarities of the driving signals according to claim 7, further comprising:

receiving the polarity controlling information and channel quantity information, and calculating the polarity controlling information and the channel quantity information in order to generate secondary polarity controlling information of a secondary-stage source driver; and

encoding the secondary-stage polarity controlling information so that the secondary polarity controlling information is mounted on a secondary-stage data input/output indication signal, and transmitting the secondary-stage data input/output indication signal to the secondary-stage source driver.

12. A method for controlling polarities of driving signals of a source driver, adapted to a liquid crystal display apparatus, comprising:

receiving a data input/output indication signal from a timing controller or a previous-stage source driver;

obtaining polarity controlling information from the data input/output indication signal, wherein the polarity controlling information is obtained by decoding a signal neighboring to a data input/output indication pulse on the data input/output indication signal;

deciding driving polarities of the source driving signals of the source driver according to the polarity controlling information;

receiving the polarity controlling information and channel quantity information, and calculating the polarity controlling information and the channel quantity information in order to generate secondary polarity controlling information of a secondary-stage source driver; and

encoding the secondary-stage polarity controlling information so that the secondary polarity controlling information is mounted on a secondary-stage data input/output indication signal, and transmitting the secondary-stage data input/output indication signal to the secondary-stage source driver.