# US 10,762,875 B2 · Synchronization of a display device in a system including multiple display devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,762,875 B2 - Document ID: US10762875B2 - Status: Granted - Kind: B2 - Application number: 15/944,592 - Filed: 2018-04-03 - Published: 2019-02-07 - Granted: 2020-09-01 - Earliest claimed: 2018-04-03 - Assignees: Intel Corporation - Applicants: Intel Corporation - Inventors: Nobuyuki Suzuki; Zhiming Zhuang; Arvind S. Tomar; Nausheen Ansari - Web page: https://patentgrep.com/patent/US10762875B2 ## CPC - G06F 3/1431: {using a single graphics controller} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/1446: {display composed of modules, e.g. video walls} - G09G 5/12: Synchronisation between the display unit and other units, e.g. other display units, video-disc players - G09G 5/18: Timing circuits for raster scan displays (specially adapted for television H04N {; synchronisation between the display unit and other display units, videodisc player G09G5/12}) - G09G 2370/04: Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller - G09G 2370/12: Use of DVI or HDMI protocol in interfaces along the display data pipeline - G09G 2370/16: Use of wireless transmission of display information - 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) ## Abstract Embodiments include apparatuses, methods, and systems including a selector. A selection signal may be provided to the selector to select a first synchronization signal as a control signal when the first synchronization signal is available, otherwise a second first synchronization signal as the control signal. The first or the second synchronization signal may synchronize a first or second display content received by a first or second display device with a first or a second display refresh rate, respectively. The control signal may be provided to a controller to control the second display content received by the second display device. Other embodiments may also be described and claimed. ## Claims ### Claim 1 An apparatus for computing, comprising: a selector; a first link coupled to the selector to receive a first synchronization signal from a first display device through the first link between the selector and the first display device, wherein the first synchronization signal is to synchronize a first display content received by the first display device with a first display refresh rate of the first display device, and wherein there is a connection between the first display device and a controller to supply the first synchronization signal to the controller to synchronize the first display content, the first link and the connection providing two different signal paths disjoint from each other; a second link coupled to the selector to receive a second synchronization signal from a second display device, wherein the second synchronization signal is to synchronize a second display content received by the second display device with a second display refresh rate of the second display device; a third link coupled to the selector to provide a control signal to the controller to control the second display content received by the second display device; and a fourth link coupled to the selector to provide the selector with a selection signal to select the first synchronization signal as the control signal to be provided to the controller when the first display device is configured to function as a display device and the first synchronization signal is available, otherwise to select the second synchronization signal as the control signal to be provided to the controller when the first display device is not configured to function as a display device. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the first display device is a master display device, and the second display device is a slave display device. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the second display content received by the second display device is synchronized by the second synchronization signal from the second display device when the first synchronization signal is not available, or synchronized by the first display device when the first synchronization signal is available. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the first synchronization signal from the first display device is a tearing effect removal timing signal for the first display device, or the second synchronization signal from the second display device is a tearing effect removal timing signal for the second display device. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the first display refresh rate of the first display device or the second display refresh rate of the second display device is in a frame by frame basis. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein the first display refresh rate of the first display device or the second display refresh rate of the second display device is 60 Hz, 120 hz, or 240 hz. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein the first display device or the second display device includes a display, and wherein the display is a selected one of a light-emitting diode (LED) display, a cathode ray tubes (CRT) display, a liquid crystal display (LCD), a thin film transistor liquid crystal display (TFT-LCD), a digital light processing (DLP) display, a plasma display, an electroluminescent panel, an organic light-emitting diode (OLED) display, or an electronic paper. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the first display content received by the first display device or the second display content received by the second display device is received according to a protocol selected from a mobile industry processor interface display serial interface (MIPI-DSI) protocol, a high-definition multimedia interface (HDMI) protocol, a display port (DP) protocol, a Miracast protocol, or a wireless display (WiDi) protocol. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the first display device functions as a display device or as an input device. ### Claim 10 (depends on 1) The apparatus of claim 1, wherein the apparatus further comprises: the first display device; and the second display device, wherein the apparatus is a tablet, a mobile device, a smart phone, a smart television (TV), a touchscreen display, or a head-mounted display (HMD). ### Claim 11 (depends on 1) The apparatus of claim 1, wherein the apparatus is hosted within a computing device, wherein the computing device is a tablet, a mobile device, a smart phone, a smart television (TV), a touchscreen display, or a head-mounted display (HMD). ### Claim 12 (depends on 1) The apparatus of claim 1, wherein the selector is a multiplexer, and the selection signal is a logic power signal to the first display device to determine a power supply to the first display device. ### Claim 13 (depends on 1) The apparatus of claim 1, further comprising: a detection circuit to generate the selection signal by detecting the first synchronization signal from the first display device is available or not. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the detection circuit includes a capacitor-resistor constant mono-stable timer, with a duration longer than a display refresh time determined by the display refresh rate of the first display device. ### Claim 15 An apparatus for computing, comprising: a communication interface to receive a control signal, wherein the control signal is selected by a selector to be a first synchronization signal from a first display device when the first display device is configured to function as a display device and the first synchronization signal is available, otherwise is selected by the selector to be a second synchronization signal from a second display device when the first display device is not configured to function as a display device, wherein the first synchronization signal is to synchronize a first display content received by the first display device with a first display refresh rate of the first display device, and the second synchronization signal is to synchronize a second display content received by the second display device with a second display refresh rate of the second display device; and a controller coupled to the communication interface to determine to transmit the second display content to the second display device based on the control signal, wherein the first synchronization signal is supplied to the selector by a first link between the first display device and the selector, and also supplied to the controller by a connection between the first display device and the controller to supply the first synchronization signal to the controller to synchronize the first display content, the first link and the connection providing two different signal paths disjoint from each other. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the controller is further to determine to transmit the first display content to the first display device based on the control signal when the first synchronization signal is available. ### Claim 17 (depends on 15) The apparatus of claim 15, wherein the first display device is a master display device, and the second display device is a slave display device. ### Claim 18 (depends on 15) The apparatus of claim 15, wherein the first synchronization signal from the first display device is a tearing effect removal timing signal for the first display device, or the second synchronization signal from the second display device is a tearing effect removal timing signal for the second display device. ### Claim 19 (depends on 15) The apparatus of claim 15, wherein the first display device or the second display device includes a display, and wherein the display is a selected one of a light-emitting diode (LED) display, a cathode ray tubes (CRT) display, a liquid crystal display (LCD), a thin film transistor liquid crystal display (TFT-LCD), a digital light processing (DLP) display, a plasma display, an electroluminescent panel, an organic light-emitting diode (OLED) display, or an electronic paper. ### Claim 20 (depends on 15) The apparatus of claim 15, wherein the first display content received by the first display device or the second display content received by the second display device is received according to a protocol selected from a mobile industry processor interface display serial interface (MIPI-DSI) protocol, a high-definition multimedia interface (HDMI) protocol, a display port (DP) protocol, a Miracast protocol, or a wireless display (WiDi) protocol. ### Claim 21 A method for communication of display content, comprising: receiving a control signal, wherein the control signal is selected by a selector to be a first synchronization signal from a first display device when the first display device is configured to function as a display device and the first synchronization signal is available, otherwise is selected by the selector to be a second synchronization signal from a second display device when the first display device is not configured to function as a display device, wherein the first synchronization signal is to synchronize a first display content received by the first display device with a first display refresh rate of the first display device, and the second synchronization signal is to synchronize a second display content received by the second display device with a second display refresh rate of the second display device; and transmitting, controlled by a controller, the second display content to the second display device based on the control signal, wherein the first synchronization signal is supplied to the selector by a first link between the first display device and the selector, and also supplied to the controller by a connection between the first display device and the controller to supply the first synchronization signal to the controller to synchronize the first display content, the first link and the connection providing two different signal paths disjoint from each other. ### Claim 22 (depends on 21) The method of claim 21, further comprising: transmitting the first display content to the first display device based on the control signal when the first synchronization signal is available. ### Claim 23 (depends on 21) The method of claim 21, wherein the first display device is a master display device, and the second display device is a slave display device. ### Claim 24 (depends on 21) The method of claim 21, wherein the first synchronization signal from the first display device is a tearing effect removal timing signal for the first display device, or the second synchronization signal from the second display device is a tearing effect removal timing signal for the second display device. ### Claim 25 (depends on 21) The method of claim 21, wherein the first display content received by the first display device or the second display content received by the second display device is received according to a protocol selected from a mobile industry processor interface display serial interface (MIPI-DSI) protocol, a high-definition multimedia interface (HDMI) protocol, a display port (DP) protocol, a Miracast protocol, or a wireless display (WiDi) protocol.