# US 12,120,330 B2 · Image transmission device and image reception device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,120,330 B2 - Document ID: US12120330B2 - Status: Granted - Kind: B2 - Application number: 18/021,119 - Filed: 2020-08-25 - Published: 2023-09-21 - Granted: 2024-10-15 - Earliest claimed: 2020-08-25 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Dongsung Kim - Web page: https://patentgrep.com/patent/US12120330B2 ## CPC - H04N 19/42: characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation (H04N19/635 takes precedence) - H04N 21/436: Interfacing a local distribution network, e.g. communicating with another STB {or one or more peripheral devices} inside the home - H04B 7/0608: {Antenna selection according to transmission parameters} - H04N 5/58: in dependence upon ambient light - H04N 21/42202: {environmental sensors, e.g. for detecting temperature, luminosity, pressure, earthquakes} - H04N 21/4363: Adapting the video stream to a specific local network, e.g. a Bluetooth® network - H04N 21/4402: involving reformatting operations of video signals for household redistribution, storage or real-time display {(details of conversion of video standards at pixel level H04N7/01; video transcoding H04N19/40; adapting incoming signals to the display format of the display terminal G09G5/005; media handling at the source in data packet switching networks H04L65/764)} - H04N 21/44227: {Monitoring of local network, e.g. connection or bandwidth variations; Detecting new devices in the local network (configuring of peripheral devices in general G06F9/4411; monitoring connectivity in data switched networks H04L43/0811)} - H04N 21/4424: {Monitoring of the internal components or processes of the client device, e.g. CPU or memory load, processing speed, timer, counter or percentage of the hard disk space used (error monitoring in general G06F11/30; arrangements for monitoring conditions of receiving stations in broadcast systems H04H60/32; diagnosis, testing or measuring for television receivers H04N17/04)} - H04N 21/4436: {Power management, e.g. shutting down unused components of the receiver (power management in computer systems G06F1/3203; hibernate or awake process in computer systems G06F9/4418)} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - H04B: TRANSMISSION ## Abstract An image transmission device including a content compression unit configured to compress an image signal, a wireless transmission unit configured to wirelessly transmit the compressed image signal to an image reception device, and a processor configured to switch a power mode of the image transmission device to a low power mode based on a determination that an image signal is not being received from an external source or that an ambient brightness at the image reception device is less than a preset brightness, and control the content compression unit to increase a compression rate of the image signal in the low power mode. ## Claims ### Claim 1 An image transmission device comprising: a content compression unit configured to compress an image signal; a wireless transmission unit configured to wirelessly transmit the compressed image signal to an image reception device; and a processor configured to: switch a power mode of the image transmission device to a low power mode based on a determination that an image signal is not being received from an external source; and control the content compression unit to increase a compression rate of the image signal in the low power mode, wherein an image signal corresponding to a background image is transmitted to the image reception device when the image signal is not being received, and is subject for increasing the compression rate. ### Claim 2 (depends on 1) The image transmission device of claim 1, wherein the processor is further configured to control the wireless transmission unit to reduce a transmission power consumed in transmitting the image signal. ### Claim 3 (depends on 2) The image transmission device of claim 2, wherein the processor is further configured to adjust an arrangement angle of a radio frequency (RF) antenna included in the wireless transmission unit to reduce the transmit power. ### Claim 4 (depends on 1) The image transmission device of claim 1, wherein the processor is further configured to transmit a power mode switch request message to the image reception device through the wireless transmission unit requesting the image reception device to switch to a low power mode. ### Claim 5 (depends on 1) The image transmission device of claim 1, further comprising a signal input interface and a signal discrimination unit, wherein the signal discrimination unit determines whether the image signal is being received from an external source based on a signal output by the signal input interface. ### Claim 6 (depends on 5) The image transmission device of claim 5, further comprising a memory storing a data table comprising compression rates corresponding to various ambient brightness levels. ### Claim 7 (depends on 6) The image transmission device of claim 6, wherein the compression rate for the content compression unit is determined based on the stored data table using an ambient brightness at the image reception device. ### Claim 8 (depends on 1) The image transmission device of claim 1, wherein the wireless transmission unit comprises: one or more RF antennas configured to transmit the compressed image signal to the image reception device through RF communication; and a Bluetooth module for bi-directional communication with the image reception device.