DEVICE AND METHOD FOR DRIVING IMAGE DISPLAY DEVICE

• US 20110292028A1
• Filed: 05/20/2011
• Published: 12/01/2011
• Est. Priority Date: 05/25/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Chang, Kuk-Hui, SEO, Byung-Huyn, Kim, Hui
• Granted Patent: US 8,477,132 B2
• Time in Patent Office: Days
• US Class Current: 345/213
• 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 3/2096 Details of the interface to the display terminal specific for a flat panel suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A device for driving an image display device that includes an image display panel, a plurality of drivers for driving the image display panel, a Low Voltage Differential Signaling (LVDS) transmission unit for converting external image data and a plurality of control signals including frame ratio setting signals into LVDS signals and transmitting the same, an LVDS reception unit for converting the image data and the plurality of control signals including frame ratio setting signals OP1, OP1 converted into the LVDS signals and transmitted thus into TTL signals and forwarding the same, and a timing controller for aligning the image data to fit to the display frame ratio according to the frame ratio setting signal and the plurality of control signals from the LVDS reception unit and supplying the same to the plurality of drivers, for displaying the image on the image display panel.

Claims

1. A device for driving an image display device comprising:

an image display panel having a plurality of pixels for displaying an image;

a plurality of drivers for driving the image display panel;

a Low Voltage Differential Signaling (LVDS) transmission unit for converting an external image data and a plurality of control signals including frame ratio setting signals into LVDS signals and transmitting the same;

a LVDS reception unit for converting the image data and the plurality of control signals including frame ratio setting signals converted into the LVDS signals and transmitted thus into Transistor-Transistor Logic (TTL) signals and forwarding the same; and

a timing controller for aligning the image data to fit to the display frame ratio according to the frame ratio setting signals and the plurality of control signals from the LVDS reception unit and supplying the same to the plurality of drivers, for displaying the image on the image display panel.

2. The device as claimed in claim 1, wherein the LVDS transmission unit converts 30 bits of the image data, 1 bit of a horizontal synchronizing signal, 1 bit of a vertical synchronizing signal, and 1 bit of a data enable signal, and 2 bits of the frame ratio setting signals into an LVDS signal format and transmits the same as 1 port LVDS data on one pixel, and

the LVDS reception unit converts the 1 port LVDS data on one pixel into the TTL signals which are the 30 bits of the image data, 1 bit of a horizontal synchronizing signal, 1 bit of a vertical synchronizing signal, and 1 bit of a data enable signal, and 2 bits of the frame ratio setting signals and supplying the same to the timing controller.

3. The device as claimed in claim 2, wherein the LVDS transmission unit includes a TTL-TO-LVDS converter, a Phase Locked Loop (PLL), and first to fourth buffers, for receiving the 30 bits of the image data through 30 TTL transmission lines, and the frame ratio setting signal, the horizontal synchronizing signal, the vertical synchronizing signal, and the data enable signal through 5 TTL signal transmission lines, and transmitting the image data and the control signals including the frame ratio setting signals converted into the LVDS signals thus to the LVDS reception unit through first to third buffers provided to three output terminals on the TTL-TO-LVDS converter.

4. The device as claimed in claim 3, wherein the LVDS reception unit includes the LVDS-TO-TTL converter and a second PLL and fifth to eighth buffers for receiving the one port LVDS signals on one pixel through the fifth to seventh buffers provided to three input terminals on the LVDS-TO-TTL converter, for converting the one port LVDS signals on one pixel into TTL signals of 30 bits of the image data, 1 bits of a horizontal synchronizing signal, 1 bit of a vertical synchronizing signal, and 1 bit of a data enable signal, and 2 bits of the frame ratio setting signals and supplying the same to the timing controller.

5. A method for driving an image display device comprising:

converting an external image data and a plurality of control signals including frame ratio setting signals into LVDS signals and transmitting the same;

converting the image data and the plurality of control signals including the frame ratio setting signals converted into the LVDS signals and transmitted thus into TTL signals and forwarding the same; and

aligning the image data to fit to the display frame ratio according to the frame ratio setting signal and the plurality of control signals and supplying the same to a plurality of drivers, for displaying the image on the image display panel.

6. The method as claimed in claim 5, wherein the step of converting the image data and the plurality of control signals including the frame ratio setting signals converted into the LVDS signals and transmitted thus into TTL signals and forwarding the same includes;

the step of converting 30 bits of the image data, 1 bit of a horizontal synchronizing signal, 1 bit of a vertical synchronizing signal, and 1 bit of a data enable signal, and 2 bits of the frame ratio setting signals into an LVDS signal format and transmitting the same as 1 port LVDS data on one pixel, and

the step of aligning the image data to fit to the display frame ratio according to the frame ratio setting signal and the plurality of control signals and supplying the same to a plurality of drivers, for displaying the image on the image display panel includes;

the step of receiving and converting the 1 port LVDS data on one pixel transmitted thus into the TTL signals which are the 30 bits of the image data, 1 bit of a horizontal synchronizing signal, 1 bit of a vertical synchronizing signal, and 1 bit of a data enable signal, and 2 bits of the frame ratio setting signals.

7. The method as claimed in claim 6, wherein the step of converting the image data and the plurality of control signals including the frame ratio setting signals converted into the LVDS signals and transmitted thus into TTL signals and forwarding the same includes;

the step of using a LVDS-TO-TTL converter, a PLL, and first to fourth buffers, for receiving the 30 bits of the image data through 30 TTL transmission lines, and the frame ratio setting signal, the horizontal synchronizing signal, the vertical synchronizing signal, and the data enable signal through 5 TTL signal transmission lines, and transmitting the image data and the control signals including the frame ratio setting signal converted into the LVDS signals thus to the LVDS reception unit through first to third buffers provided to three output terminals on the TTL-TO-LVDS converter.

8. The method as claimed in claim 7, wherein the step of aligning the image data to fit to the display frame ratio according to the frame ratio setting signal and the plurality of control signals and supplying the same to a plurality of drivers, for displaying the image on the image display panel includes;

the step of providing the LVDS-TO-TTL converter, a second PLL and fifth to eighth buffers, for receiving the one port LVDS signals on one pixel through the fifth to seventh buffers provided to three input terminals on the LVDS-TO-TTL converter, and converting the one port LVDS signals on one pixel into TTL signals of 30 bits of the image data, 1 bit of a horizontal synchronizing signal, 1 bit of a vertical synchronizing signal, and 1 bit of a data enable signal, and 2 bits of the frame ratio setting signals and forwarding the same.