# US 7,612,772 B2 · Display monitor with a common display data channel

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- Number: US 7,612,772 B2
- Document ID: US7612772B2
- Status: Granted
- Kind: B2
- Application number: 11/126,178
- Filed: 2005-05-11
- Published: 2006-06-29
- Granted: 2009-11-03
- Earliest claimed: 2004-12-29
- Assignees: Tatung Co., Ltd.
- Inventors: Shih-Hua Tseng
- Web page: https://patentgrep.com/patent/US7612772B2

## CPC

- G06F 1/263: {Arrangements for using multiple switchable power supplies, e.g. battery and AC (G06F1/30 takes precedence)}
- G06F 1/3203: Power management, i.e. event-based initiation of a power-saving mode
- G06F 1/3265: {Power saving in display device}
- G09G 5/006: {Details of the interface to the display terminal (specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04)}
- Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A display monitor for a common display data channel uses a DDC access switch to separate the common display data channel, so that regardless of whether the display monitor is powered on or off, a personal computer can access the Extended Display Identification Data (EDID) in the EEPROM, and the low-level voltage of an MCU in the display monitor won't interfere in the access between the personal computer and the EEPROM. When the power of the display monitor is turned on, the DDC access switch closes so that the MCU can access the EDID in the EEPROM.

## Claims

### Claim 1

A display monitor with a common display data channel comprising:
a first data channel connected to a computer host having a computer host power supply;
a second data channel connected between the computer host and a microprocessor;
a display monitor power supply;
a memory device connected to the first data channel so the computer host is capable of accessing the memory device via the first data channel;
a composite power supply connected to the host power supply and the display monitor power supply for providing power to the memory device;
a DDC access switch connected to the first data channel, the second data channel, and the display monitor power supply;
wherein when the display monitor power supply is turned off, the DDC access switch is switched to separate the first data channel and the second data channel and the composite power supply provides power from the host power device to the memory device so as to enable the computer host to access the memory device via the first data channel without being affected by low electric potential on the second data channel, and when the display monitor power supply is turned on, the DDC access switch is switched to connect the first data channel and the second data channel; and
a microprocessor connected to the second data channel and the display monitor power supply; wherein when the display monitor power supply is turned on, the composite power supply provides power from the display monitor power supply to the memory device, so that the microprocessor is capable of accessing the memory device via the second data channel and the first data channel connected by the DDC access switch.

### Claim 2 (depends on 1)

The display monitor with a common display data channel as claimed in claim 1, wherein the composite power supply comprises two diodes separately connected to the host power supply and the display monitor power supply for providing power to the memory device.

### Claim 3 (depends on 1)

The display monitor with a common display data channel as claimed in claim 1, further comprising: an internal device and a power control device connected to the display monitor power supply, the power control device limiting power to the internal device in response to receiving a saving-energy signal output by the microprocessor.

### Claim 4 (depends on 1)

The display monitor with a common display data channel as claimed in claim 1, wherein the memory device is an EEPROM stored with extended display identification data for the display monitor.