KVM switch and method for providing expansion display identification data of screen

Abstract

The invention discloses a KVM switch and method for providing expansion display identification data of screen, capable of automatically or manually updating the expansion display identification data of screen stored by the KVM switch. The KVM switch comprises a processor, at least one internal memory and at least one switcher. When the KVM switch is starting up, replaces the screen or receives an external control signal, the processor can compare that whether the expansion display identification data of screen is the same as the expansion display identification data stored in the internal memory or not; and when the two is not the same, the expansion display identification data stored in the internal memory is overwritten by the expansion display identification data of screen. In addition, the processor sends a hot plug detecting signal to a computer, thus the computer can read updated expansion display identification data.

Description

【Technical field】 [0001] The present invention relates to a KVM switch (Keyboard-Video-Mouse), especially a kind of extended display identification data (EDID, Extended Display Identification Data) that can provide and update the screen for the computer coupled to it. ) KVM switch and method. 【Background technique】 [0002] When a general computer replaces the screen and is directly connected to the screen, the extended display identification data will not be automatically updated. Instead, the computer must be turned off first, and then the computer can read the extended display identification information on the screen after the computer is restarted. [0003] For computers that support screen hot plug detection (HPD, Hot Plug Detection), such as Macintosh (MAC) computers, when the Macintosh computer replaces the screen and is directly connected to the screen, the hot plug detection signal Extended display identification data is automatically updated when changes are dete...

AI Technical Summary

Problems solved by technology

[0006] If the KVM switch is turned on and the screen is replaced or plugged in, the KVM switch will not automatically update the extended display identification information in the internal memory, resulting in the expansion display identification information in the internal memory being different from that of the screen. data, the computer coupled to the KVM switch reads the real extended display identification data of the non-screen, which leads to problems, such as the screen cannot display the picture, cannot support the best resolution, and draw delays, etc.

[0007] For computers that support screen hot-plug detection, such as Macintosh computers, when the KVM switch is switched, it is equivalent to the action of plugging and unplugging the screen. The Macintosh computer will detect the phenomenon of plugging and unplugging, so it will The re-reading of the extended display identification data will cause a delay of 5 to 8 seconds when the screen is displaying the image, resulting in the situation that the picture cannot be drawn quickly

In addition, when all the computers coupled to the KVM switch are computers that support screen hot-plug detection, once the screen is replaced or plugged in, the KVM switch and all computers must be shut down first to allow the KVM switch The computer can read the correct extended display identification data only after the switch restarts, reads the expansion display identification data of the screen, and updates the expansion display identification data of the memory. Therefore, for computers that support screen hot-plug detection, replace the Or plugging and unplugging the screen into the KVM switch is a tricky and complex process that needs to be dealt with

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