Display driving system with monitoring unit for data driver
A display driving system includes a timing controller configured to receive a data signal composed of image data and generate a control signal such as a clock signal; an interface configured to transmit the data signal and the control signal to a plurality of data drivers; the data drivers configured to receive the data signal and the control signal through the interface and supply received signals to a display panel to display an image; and a monitoring unit configured to feed back LOCK signals indicative of state information of the data drivers to the timing controller such that the data drivers can be monitored.
1. A display driving system comprising:
a timing controller configured to receive a data signal composed of image data and generate a control signal such as a clock signal;
an interface configured to transmit the data signal and the control signal to a plurality of data drivers;
the data drivers configured to receive the data signal and the control signal through the interface and supply received signals to a display panel to display an image; and
a monitoring unit configured to feed back one or more LOCK signals indicative of state information of one or more of the data drivers to the timing controller such that the data drivers can be monitored,
wherein when a first data driver from the plurality of data drivers is in an abnormal state due to electromagnetic interference (EMI) or noise, the first data driver outputs a first LOCK signal indicating that the first data driver is in the abnormal state.
2. The display driving system according to claim 1 ,
wherein the monitoring unit comprises a sequential transmission section which sequentially connects the data drivers with one another such that the data drivers can sequentially transmit the LOCK signals indicating their respective state information to other adjoining data drivers, and which connects a finally positioned data driver to the timing controller such that the finally positioned data driver can feed back a LOCK signal to the timing controller.
3. The display driving system according to claim 1 ,
wherein the monitoring unit comprises first through N th sequential transmission sections which are configured to divide the plurality of data drivers into N (N is a natural number identical to or greater than 1) number of groups each of which is composed of one or more data drivers, and connect the data drivers of the respective groups with one another in such a way as to sequentially transmit the LOCK signals to adjoining data drivers, such that last data drivers of the respective groups which receive the LOCK signals are connected to the timing controller so that the LOCK signals of the respective groups can be transmitted and fed back to the timing controller.
4. The display driving system according to claim 3 , wherein, if a LOCK signal indicating that one or more of the data drivers is in an abnormal state is inputted to the timing controller, the timing controller interrupts transmission of the data signal, and implements a clock training until the timing controller receives a fed-back signal indicating that the data drivers are in a normal state, thereby stabilizing the data drivers.
5. The display driving system according to claim 1 , wherein, if a LOCK signal indicating that one or more of the data drivers is in an abnormal state is inputted to the timing controller, the timing controller interrupts transmission of the data signal, and implements a clock training until the timing controller receives a fed-back signal indicating that the data drivers are in a normal state, thereby stabilizing the data drivers.
6. The display driving system according to claim 1 ,
wherein the monitoring unit comprises a LOCK signal output section which independently transmits the LOCK signals outputted from the plurality of data drivers to a logic gate, and the logic gate which is connected to the timing controller, combines one or more LOCK signals outputted from the LOCK signal output section, executes a logical operation and outputs a resultant signal to the timing controller.
7. The display driving system according to claim 6 ,
wherein, if the first LOCK signal is outputted from the first data driver, the first data driver neglects the data signal transmitted through the interface and drives the display panel using previously inputted data; and
wherein the timing controller is configured to transmit a preamble signal as deskewing data between the data signal and the clock signal or a clock training signal for recovery of the clock signal, to the first data driver until a second LOCK signal indicating that the first data driver is in a normal state is fed back.
8. The display driving system according to claim 1 ,
wherein the monitoring unit comprises first through M th LOCK signal output sections which are configured to divide the plurality of data drivers into M (M is a natural number identical to or greater than 1) number of groups each of which is composed of one or more data drivers, and transmit independently the LOCK signals outputted from the data drivers constituting the respective groups to logic gates, and first through M th logic gates which are configured to receive the LOCK signals transmitted from the respective groups of the first through M th LOCK signal output sections, execute logical operations, and feed back output values thereof to the timing controller.
9. The display driving system according to claim 8 ,
wherein, if the first LOCK signal is outputted from the first data driver, the first data driver neglects the data signal transmitted through the interface and drives the display panel using previously inputted data; and
wherein the timing controller is configured to transmit a preamble signal as deskewing data between the data signal and the clock signal or a clock training signal for recovery of the clock signal, to the first data driver until a second LOCK signal indicating that the first data driver is in a normal state is fed back.
10. The display driving system according to claim 1 , wherein the monitoring unit comprises independent feed-back sections which are configured to independently output the LOCK signals indicative of state information of the plurality of data drivers and feed back the LOCK signals to the timing controller through independent transmission lines connected between the respective data drivers and the timing controller.
11. The display driving system according to claim 10 ,
wherein, if the first LOCK signal is outputted from the first data driver, the first data driver neglects the data signal transmitted through the interface and drives the display panel using previously inputted data; and
wherein the timing controller is configured to transmit a preamble signal as deskewing data between the data signal and the clock signal or a clock training signal for recovery of the clock signal, to the first data driver until a second LOCK signal indicating that the first data driver is in a normal state is fed back.
12. The display driving system according to claim 1 , wherein the first LOCK signal is in a logic low state.
13. The display driving system according to claim 1 , wherein when the first data driver is in the abnormal state, the first data driver inactivates and the first LOCK signal indicates that the first data driver is in an inactivated state.
14. The display driving system according to claim 13 , wherein when the first data driver is in the abnormal state, a second data driver from the plurality of data drivers inactivates and outputs a LOCK signal indicating that the second data driver is in an inactivated state.