# US 10,120,230 B2 · Image display apparatus and control method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,120,230 B2 - Document ID: US10120230B2 - Status: Granted - Kind: B2 - Application number: 15/240,661 - Filed: 2016-08-18 - Published: 2017-03-02 - Granted: 2018-11-06 - Earliest claimed: 2015-08-31 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Tomonori Nakazawa - Web page: https://patentgrep.com/patent/US10120230B2 ## CPC - G02F 1/133385: {with cooling means, e.g. fans} - G09F 9/00: Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements (in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00) - G09G 3/3406: {Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336)} - G09G 3/36: using liquid crystals - G09G 2320/041: Temperature compensation - G09G 2320/0626: for control of overall brightness - G09G 2360/145: the light originating from the display screen - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS - 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 An image display apparatus includes a display module that displays an image, a cooling fan that rotates to cool the display module, an ambient temperature sensor that acquires an ambient temperature of the display module, and a fan control circuit board that controls a speed of rotation of the cooling fan. In response to acquisition of a mode change signal by the fan control circuit board, the fan control circuit board controls the speed of rotation of the cooling fan from a first speed of rotation to a second speed of rotation lower than the first speed of rotation and, in response to a lapse of a first period determined based on the ambient temperature, controls the speed of rotation of the cooling fan from the second speed of rotation to a third speed of rotation higher than the second speed of rotation. ## Claims ### Claim 1 An image display apparatus connected to an imaging apparatus comprising: a display module configured to display an image; a fan configured to rotate to cool the display module; a first detecting unit configured to acquire an ambient temperature of the display module; and a control unit configured to control a speed of rotation of the fan, wherein, in response to acquisition, by the control unit, of a signal corresponding to a recording instruction given by the imaging apparatus, the control unit controls the speed of rotation the fan from a first speed of rotation to a second speed of rotation lower than the first speed of rotation, and wherein, in response to a lapse of a first period determined based on the ambient temperature, the control unit controls the speed of rotation of the fan from the second speed of rotation to a third speed of rotation higher than the second speed of rotation. ### Claim 2 (depends on 1) The image display apparatus according to claim 1, further comprising a determining unit configured to determine the first period in response to acquisition of the signal. ### Claim 3 (depends on 1) The image display apparatus according to claim 1, wherein the first period determined in a case where the ambient temperature exhibits a first temperature is shorter than the first period determined in a case where the ambient temperature exhibits a second temperature higher than the first temperature. ### Claim 4 (depends on 1) The image display apparatus according to claim 1, wherein the second speed of rotation is equal to 0. ### Claim 5 (depends on 1) The image display apparatus according to claim 1, further comprising an acquiring unit configured to acquire a thermal parameter indicating an amount of heat generated from the display module, wherein the control unit controls the speed of rotation of the fan to the second speed of rotation and the speed of rotation of the fan to the third speed of rotation in response to a lapse of the first period determined based on the ambient temperature and the thermal parameter. ### Claim 6 (depends on 5) The image display apparatus according to claim 5, wherein the first period determined in a case where the thermal parameter is a first value is longer than the first period determined in a case where the thermal parameter is a second value greater than the first value. ### Claim 7 (depends on 5) The image display apparatus according to claim 5, wherein the thermal parameter is at least one of a driving voltage, a driving current, a power consumption, or a brightness set value of the display module. ### Claim 8 (depends on 1) The image display apparatus according to claim 1, wherein the third speed of rotation is equal to the first speed of rotation. ### Claim 9 (depends on 1) The image display apparatus according to claim 1, wherein the third speed of rotation is greater than the first speed of rotation. ### Claim 10 (depends on 1) The image display apparatus according to claim 1, wherein the control unit controls the fan to the first speed of rotation in response to an elapse of a second time period from a time when the control unit controls the speed of rotation of the fan to the third speed of rotation, the second time period determined based on the ambient temperature. ### Claim 11 (depends on 10) The image display apparatus according to claim 10, further comprising a determining unit configured to determine the second time period based on the ambient temperature in response to the control unit controlling speed of the rotation of the fan to the third speed. ### Claim 12 (depends on 1) The image display apparatus according to claim 1, wherein the display module comprises: a backlight configured to emit light; a liquid crystal panel configured to enable light irradiated from the backlight to pass through and display an image; a control circuit board configured to control the backlight and the liquid crystal panel; and a housing configured to cover at least a back surface of the backlight and the control circuit board, wherein the fan exchanges air inside the housing and air outside the housing to cool the display module. ### Claim 13 (depends on 12) The image display apparatus according to claim 12, wherein the first detecting unit is provided within the housing. ### Claim 14 (depends on 1) The image display apparatus according to claim 1, further comprising a second detecting unit configured to acquire information describing a temperature inside the display module, wherein the control unit controls the speed of rotation of the fan to the second speed of rotation, and wherein, in a case where a temperature detected by the second detecting unit exceeds a predetermined temperature, the control unit controls the speed of rotation of the fan to the third speed of rotation. ### Claim 15 A control method for an image display apparatus connected to an imaging apparatus, the image display apparatus including a display module configured to display an image and a fan configured to rotate to cool the display module, the method comprising the steps of: an acquiring step of acquiring an ambient temperature of the display module; and a controlling step of controlling a speed of rotation of the fan, wherein, in response to acquisition, by the controlling step, of a signal corresponding to a recording instruction given by the imaging apparatus, the controlling step controls the speed of rotation the fan from a first speed of rotation to a second speed of rotation lower than the first speed of rotation, and wherein, in response to a lapse of a first period determined based on the ambient temperature, the controlling step controls the speed of rotation of the fan from the second speed of rotation to a third speed of rotation higher than the second speed of rotation. ### Claim 16 An image display apparatus comprising: a display module configured to display an image; a fan configured to rotate to cool the display module; a sensor configured to detect a value corresponding to a temperature of the display module; and a control unit configured to control a speed of rotation of the fan, wherein, in response to an input of a predetermined instruction to the control unit, the control unit determines a first period based on the detected value and decreases the speed of rotation of the fan from a first speed of rotation to a second speed of rotation, wherein in response to a lapse of the first period after decreasing the speed of rotation of the fan, the control unit increases the speed of rotation of the fan from the second speed of rotation to a third speed of rotation. ### Claim 17 (depends on 16) The image display apparatus according to claim 16, wherein the control unit controls the fan to stop during the first period. ### Claim 18 (depends on 16) The image display apparatus according to claim 16, wherein the third speed of rotation is higher than the first speed of rotation. ### Claim 19 (depends on 16) The image display apparatus according to claim 16, wherein the image display apparatus is connected to an imaging apparatus, and the predetermined instruction is a signal outputted by the imaging apparatus in response to beginning a recording operation. ### Claim 20 (depends on 16) The image display apparatus according to claim 16, wherein the predetermined instruction is an instruction to change an operation mode of the fan, the instruction inputted by a user. ### Claim 21 (depends on 16) The image display apparatus according to claim 16, further comprising an acquiring unit configured to acquire a thermal parameter corresponding to an amount of heat generated from the display module, wherein the control unit determines the first period based on the detected value and the thermal parameter. ### Claim 22 (depends on 21) The image display apparatus according to claim 21, wherein the thermal parameter is at least one of a driving voltage, a driving current, a power consumption, or a brightness set value of the display module. ### Claim 23 (depends on 16) The image display apparatus according to claim 16, wherein the third speed of rotation is equal to the first speed of rotation. ### Claim 24 (depends on 16) The image display apparatus according to claim 16, wherein the display module comprises: a backlight configured to emit light; a liquid crystal panel configured to enable light irradiated from the backlight to pass through and display an image; a control circuit board configured to control the backlight and the liquid crystal panel; and a housing configured to cover at least a back surface of the backlight and the control circuit board, wherein the fan exchanges air inside the housing and air outside the housing to cool the display module. ### Claim 25 A control method for an image display apparatus including a display module configured to display an image, a fan configured to rotate to cool the display module, and a sensor configured to detect a value corresponding to a temperature of the display module, the method comprising the steps of: acquiring the value from the sensor, and controlling the speed of rotation the fan based on the value acquired, wherein in response to an input of a predetermined instruction to the image display apparatus, determining a first period determined based on the detected value and decreasing the speed of rotation the fan from a first speed of rotation to a second speed of rotation, and in response to a lapse of the first period after the decreasing the speed of rotation of the fan, increasing the speed of rotation of the fan from the second speed of rotation to a third speed of rotation.