Device for adjusting transmission signal level based on channel loading

• US 20070195048A1
• Filed: 01/31/2007
• Published: 08/23/2007
• Est. Priority Date: 01/31/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jeon, Yong-Weon, Nam, Jang-Jin
• Granted Patent: US 8,004,486 B2
• Time in Patent Office: Days
• US Class Current: 345/98
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/06 Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
• 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 3/3611 Control of matrices with row and column drivers

Abstract

A device for controlling the level of a transmission signal according to the channel loading is provided. The device may include a plurality of semiconductor devices and a controller to control the plurality of semiconductor devices. The controller may control the level of a signal to be transmitted to each of the plurality of semiconductor devices according to the channel loading on each semiconductor device.

Claims

1. A device for controlling transmission level according to channel loading, the device comprising:

a plurality of semiconductor devices; and

a controller to control the plurality of semiconductor devices, wherein the controller controls the level of a signal to be transmitted to each of the plurality of semiconductor devices according to the channel loading on each semiconductor device.

2. The device of claim 1, wherein:

the controller controls the levels of a data current signal and a reference current signal in response to a control signal; and

the controller transmits the data current signal and the reference current signal.

3. The device of claim 2, wherein:

the semiconductor devices are divided into at least one group;

a first semiconductor device of the at least one group is connected to the controller in a point-to-point fashion; and

a second semiconductor device of the at least one group is connected to the first semiconductor device in a cascade fashion.

4. The device of claim 3, wherein:

the first semiconductor device generates a cascade signal at a constant level; and

the first semiconductor device transmits the cascade signal to the second semiconductor device.

5. The device of claim 3, wherein the at least one group is one of a plurality of groups of semiconductor devices.

6. The device of claim 1, wherein the controller controls the level of the signal and transmits the controlled signal in response to a control signal.

7. The device of claim 6, wherein:

the semiconductor devices are divided into at least one group;

a first semiconductor device of the at least one group is connected to the controller in a point-to-point fashion; and

a second semiconductor device of the at least one group is connected to the corresponding first semiconductor chip in a cascade fashion.

8. The device of claim 7, wherein:

the first semiconductor device generates a cascade signal at a constant level; and

the first semiconductor device transmits the cascade signal to the second semiconductor device.

9. The device of claim 7, wherein the at least one group is one of a plurality of groups of semiconductor devices.

10. The device of claim 1, further comprising:

a display panel including a plurality of gate lines, a plurality of data lines, and a plurality of pixels, each pixel being located at a point at which a gate line intersects a data line; and

at least one gate driver driving the plurality of gate lines.

11. The device of claim 10, wherein:

the plurality of semiconductor devices are a plurality of column drivers driving the plurality of data lines; and

the controller is a timing controller controlling the plurality of column drivers; and

the timing controller controls the level of the signal to be transmitted to each column driver of the plurality of column drivers according to the channel loading on each column driver of the plurality of column drivers.

12. The device of claim 11, wherein:

the timing controller controls the levels of a data current signal and a reference current signal in response to a control signal; and

the timing controller transmits the data current signal and the reference current signal.

13. The device of claim 12, wherein:

the column drivers are divided into at least one group;

a first column driver of each the at least one group receives a data current signal and a reference current signal for a corresponding second column driver from the timing controller; and

the first column driver transmits the data current signal and the reference current signal to the second column driver.

14. The device of claim 13, wherein the first column driver generates a column reference current signal whose level is inversely proportional to the level of the reference current signal received from the timing controller, and transmits the column reference current signal to the second column driver.

15. The device of claim 13, wherein the first column driver generates a column reference current signal at a constant level, and transmits the column reference current signal to the second column driver.

16. The device of claim 13, wherein the first column driver comprises:

a receiving unit receiving the reference current signal from the timing controller; and

a transmitting unit controlling the level of the reference current signal and transmitting the controlled reference current signal to the second column driver in response to the control signal.

17. The device of claim 1, wherein the controller comprises:

a processor generating a control signal for controlling the level of the signal to be transmitted to each of the semiconductor devices of the plurality of semiconductor devices according to the channel loading on each semiconductor device; and

a plurality of transmitting units, each transmitting unit of the plurality of transmitting units controlling the level of the signal and transmitting the controlled signal to the corresponding semiconductor device in response to the control signal.

18. A controller to control a plurality of semiconductor devices, comprising:

a processor generating a control signal for controlling the level of a signal to be transmitted to each of the semiconductor devices of the plurality of semiconductor devices according to a channel loading on each semiconductor device; and

a plurality of transmitting units, each transmitting unit of the plurality of transmitting units controlling the level of the signal and transmitting the controlled signal to the corresponding semiconductor device in response to the control signal.