Device and method for evaluating connectivity between a video driver and a display
View Patent ↗A device for evaluating connectivity between a video driver and a display, the device comprises a first video driver, a first output connector, a first terminating resistance; wherein the device is characterized by comprising a first comparison unit; wherein the first video driver has an output port that is coupled to the first output connector, to the first terminating resistance and to the first comparison unit; wherein the first output connector is configured to be coupled via a first cable to a first input of the display; wherein the first comparison unit is adapted to perform comparisons between a voltage level on the first terminating resistance to multiple thresholds and to determine whether a display first input impedance is substantially equal to the first terminating resistance, whether the display first input impedance is substantially lower then the first terminating resistance, or whether the first video driver is disconnected from the display; wherein the comparisons are executed during a pixel information idle period.
1. A device for evaluating connectivity between a video driver and a display, the device comprising:
a first video driver;
a first output connector;
a first terminating resistance;
a first comparison unit; and
a first jamming circuit configured to produce jam video information either provided to the first video driver or outputted by the first video driver;
wherein the first video driver has an output port that is coupled to the first output connector, to the first terminating resistance and to the first comparison unit;
wherein the first output connector is configured to be coupled via a first cable to a first input of the display;
wherein the first comparison unit is configured to perform comparisons between a voltage level on the first terminating resistance to multiple thresholds and to determine whether a display first input impedance is substantially equal to the first terminating resistance, whether the display first input impedance is substantially lower than the first terminating resistance, and whether the first video driver is disconnected from the display; and
wherein the first comparison unit performs the comparisons during an overlap between a jam free period and a pixel information idle period;
wherein the comparisons are executed during the pixel information idle period.
2. The device according to claim 1 , wherein the pixel information idle period is at least a portion of a vertical blanking interval.
3. The device according to claim 1 , wherein the device is configured to receive information indicative of a video format and to adjust the multiple thresholds in response to the video format.
4. The device according to claim 1 , comprising:
a first test signal generator configured to send a test signal to the first video driver in order to facilitate comparisons between the voltage level on the first terminating resistance and between the multiple thresholds; and
wherein the test signal is sent when the display is idle or if the first cable is not expected to convey pixel information.
5. The device according to claim 1 , wherein:
the device further comprises a first memory circuit and a first triggering circuit;
the first memory circuit is configured to store the test signal; and wherein triggering information is configured to trigger a provision of the test signal from the first memory circuit to the first video driver; and
the first memory circuit and the first triggering circuit are activated when a processor of the device is deactivated.
6. The device according to claim 1 comprising:
a second video driver, a third video driver, a second output connector, a third output connector, a second terminating resistance ,a third terminating resistance ,a second comparison unit and a third comparison unit;
wherein the second video driver has an output port that is coupled to the second output connector, to the second terminating resistance and to the second comparison unit;
wherein the second output connector is configured to be coupled via a second cable to a second input of the display;
wherein the second comparison unit is configured to perform comparisons between a voltage level on the second terminating resistance to multiple thresholds and to determine whether a display second input impedance is substantially equal to the second terminating resistance, whether the display second input impedance is substantially lower than the second terminating resistance, or whether the second video driver is disconnected from the display;
wherein the comparisons are executed during a pixel information idle period;
wherein the third video driver has an output port that is coupled to the third output connector, to the third terminating resistance and to the third comparison unit;
wherein the third output connector is configured to be coupled via a third cable to a third input of the display;
wherein the third comparison unit is configured to perform comparisons between a voltage level on the third terminating resistance to multiple thresholds and to determine whether a display third input impedance is substantially equal to the third terminating resistance, whether the display third input impedance is substantially lower than the third terminating resistance, or whether the third video driver is disconnected from the display; and
wherein the comparisons are executed during a pixel information idle period.
7. The device according to claim 6 comprising a television format converter that is configured to adapt a format of video outputted by at least one video driver out of the first, second and third video drivers, in response to a determinations of the first, second and third comparison units.
8. A method for evaluating connectivity between a video driver and a display, the method comprising:
outputting a video signal at an output port of a first video driver;
performing, by a first comparison unit and during a pixel information idle period, multiple comparisons between a voltage level on a first terminating resistance to multiple thresholds;
determining whether a display first input impedance is substantially equal to the first terminating resistance, whether the display first input impedance is substantially lower than the first terminating resistance, and whether the first video driver is disconnected from the display; and
performing the multiple comparisons during an overlap between a jam free period and the pixel information idle period; wherein during lamming periods video information is jammed;
wherein the output port of the video driver is coupled to the first terminating resistance and to a first output connector that is configured to be coupled via a first cable to a first input of the display.
9. The method according to claim 8 , comprising receiving information indicative of a video format and adjusting the multiple thresholds in response to the video format.
10. The method according to claim 8 , wherein the method further comprises sending, by a test signal generator, a test signal to the first video driver in order to facilitate the performing of the multiple comparisons; wherein the sending occurs when the display is idle or if the first cable is not expected to convey pixel information.
11. The method according to claim 8 , comprising: storing the test signal at a first memory circuit; deactivating a processor that is configured to control the sending of the test signal while maintaining the first memory circuit and a first triggering circuit active; triggering a provision of the test signal from the first memory circuit to the first video driver.
12. The method according to claim 8 , comprising:
outputting a video signal at an output port of a second video driver;
performing, by a second comparison unit and during a pixel information idle period, multiple comparisons between a voltage level on a second terminating resistance to multiple thresholds;
determining whether a display second input impedance is substantially equal to the second terminating resistance, whether the display second input impedance is substantially lower than the second terminating resistance, or whether the second video driver is disconnected from the display;
wherein the output port of the second video driver is coupled to the second terminating resistance and to a second output connector that is configured to be coupled via a second cable to a second input of the display; outputting a video signal at an output port of a third video driver; performing, by a third comparison unit and during a pixel information idle period, multiple comparisons between a voltage level on a third terminating resistance to multiple thresholds; determining whether a display third input impedance is substantially equal to the third terminating resistance, whether the display third input impedance is substantially lower then the third terminating resistance, or whether the third video driver is disconnected from the display;
wherein the output port of the third video driver is coupled to the third terminating resistance and to a third output connector that is configured to be coupled via a third cable to a third input of the display.
13. The method according to claim 12 , comprising adapting a format of video outputted by at least one video driver out of the first, second and third video drivers, in response to determinations of the first, second and third comparison units.
14. An assembly of the device according to claim 1 .
15. A method for evaluating connectivity between a video driver and a display, the method comprising:
outputting a video signal at an output port of a first video driver;
performing, by a first comparison unit and during a pixel information idle period, multiple comparisons between a voltage level on a first terminating resistance to multiple thresholds;
determining whether a display first input impedance is substantially equal to the first terminating resistance, whether the display first input impedance is substantially lower than the first terminating resistance, and whether the first video driver is disconnected from the display; and
performing the multiple comparisons during an overlap between a jam free period and the pixel information idle period; wherein during jamming periods video information is jammed;
wherein the output port of the video driver is coupled to the first terminating resistance and to a first output connector that is configured to be coupled via a first cable to a first input of the display, and wherein the pixel information idle period is at least a portion of a vertical blanking interval.
16. The method according to claim 9 , wherein the method further comprises sending, by a test signal generator, a test signal to the first video driver in order to facilitate the performing of the multiple comparisons; wherein the sending occurs when the display is idle or if the first cable is not expected to convey pixel information.
17. The method according to claim 8 , wherein the method further comprises sending, by a test signal generator, a test signal to the first video driver in order to facilitate the performing of the multiple comparisons; wherein the sending occurs when the display is idle or if the first cable is not expected to convey pixel information.
18. The method according to claim 15 , wherein the method further comprises sending, by a test signal generator, a test signal to the first video driver in order to facilitate the performing of the multiple comparisons; wherein the sending occurs when the display is idle or if the first cable is not expected to convey pixel information.
19. The device according to claim 1 , wherein the jam video information is provided to the first video driver.
20. The device according to claim 1 , wherein the jam video information outputted by the first video driver.