# US 10,319,317 B2 · Display control device, display device, method for controlling display control device, and storage medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,319,317 B2 - Document ID: US10319317B2 - Status: Granted - Kind: B2 - Application number: 15/576,977 - Filed: 2016-07-07 - Published: 2018-06-07 - Granted: 2019-06-11 - Earliest claimed: 2015-08-31 - Assignees: Sharp Kabushiki Kaisha - Applicants: Sharp Kabushiki Kaisha - Inventors: Takuya Okamoto; Junki Asai - Web page: https://patentgrep.com/patent/US10319317B2 ## CPC - G09G 3/3611: {Control of matrices with row and column drivers} - G09G 5/005: {Adapting incoming signals to the display format of the display terminal} - G09G 5/008: {Clock recovery} - G09G 5/391: Resolution modifying circuits, e.g. variable screen formats - G09G 2310/0264: Details of driving circuits - G09G 2340/02: Handling of images in compressed format, e.g. JPEG, MPEG - G09G 2340/0435: Change or adaptation of the frame rate of the video stream - G09G 2360/02: Graphics controller able to handle multiple formats, e.g. input or output formats - G09G 2360/18: Use of a frame buffer in a display terminal, inclusive of the display panel - H04N 5/63: Generation or supply of power specially adapted for television receivers - H04N 7/01: Conversion of standards {, e.g. involving analogue television standards or digital television standards processed at pixel level} - 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) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract The present invention provides a display control device and a display device each of which can reduce electric power consumption by switching a resolution of image data to be displayed. In a case of transferring image data having a 4k resolution, an image transferring section (12) transfers the image data to a display driver (20) via a first lane and a second lane. In a case of transferring image data having an FHD resolution, the image transferring section (12) stops operation of the first lane and transfers the image data to the display driver (20) via the second lane. ## Claims ### Claim 1 A display control device, comprising: a display driver; an image transferring section configured to transfer image data to the display driver; and a first transmission line and a second transmission line each of which connects the display driver with the image transferring section, in a case of transferring image data having a first resolution, the image transferring section transferring the image data having the first resolution to the display driver via the first transmission line and the second transmission line, and in a case of transferring image data having a second resolution which is lower than the first resolution, the image transferring section (i) stopping operation of the first transmission line and (ii) transferring the image data having the second resolution to the display driver via the second transmission line, wherein the display driver includes a frame memory which is capable of storing the image data having the first resolution, and wherein in a case of storing the image data having the second resolution, the frame memory skips some of memory addresses. ### Claim 2 (depends on 1) The display control device as set forth in claim 1, wherein: the frame memory stores image data, which is of a lowermost row of an image having the second resolution, at a position corresponding to image data of a (B/A)th raw of an image having the first resolution, where a frame rate of the image data having the second resolution is A times that of the image data having the first resolution, and B is the number of rows in the first resolution. ### Claim 3 (depends on 1) The display control device as set forth in claim 1, wherein: in a case where a frame rate is constant, the frame memory stores data, which is of a lowermost row of an image having the second resolution, at a position corresponding to data of a lowermost row of an image having the first resolution. ### Claim 4 (depends on 1) The display control device as set forth in claim 1, wherein: when (i) the first resolution is switched to the second resolution and (ii) a first frame rate is switched to a second frame rate which is C times (C>1) the first frame rate, the display driver reads out (1−1/C) of the image data which has the first resolution and is stored in the frame memory and then transmits a transfer timing signal to the image transferring section; and upon receipt of the transfer timing signal, the image transferring section transfers image data having the second frame rate to the display driver. ### Claim 5 (depends on 1) The display control device as set forth in claim 1, further comprising: a first transmission channel including the first transmission line and the second transmission line; and a second transmission channel including a third transmission line and a fourth transmission line, in a case of transferring the image data having the first resolution, the image transferring section transferring the image data having the first resolution to the display driver via the first transmission line, the second transmission line, the third transmission line, and the fourth transmission line, and in a case of transferring the image data having the second resolution, the image transferring section (i) stopping operation of the first transmission line and the third transmission line and (ii) transferring the image data having the second resolution to the display driver via the second transmission line and the fourth transmission line. ### Claim 6 (depends on 1) The display control device as set forth in claim 1, wherein: the image data indicates an image for one (1) frame; and the image transferring section transfers the image data at a timing corresponding to a frame rate of the image. ### Claim 7 (depends on 1) The display control device as set forth in claim 1, further comprising: an image generating section, in a case where a static image is to be displayed, the image generating section generating the image data having the first resolution, and in a case where a moving image is to be displayed, the image generating section generating the image data having the second resolution. ### Claim 8 (depends on 1) A display device, comprising: a display control device recited in claim 1; and a display section configured to display an image, the display section being driven by the display driver. ### Claim 9 (depends on 1) A non-transitory computer-readable storage medium storing therein a control program for causing a computer to function as a display control device recited in claim 1, the control program causing the computer to function as the image transferring section. ### Claim 10 A display control device comprising: a display driver including a frame memory which is capable of storing image data having a first resolution; an image transferring section configured to transfer image data to the display driver; and a first transmission line and a second transmission line each of which connects the display driver with the image transferring section, wherein in a case of transferring the image data having the first resolution, the image transferring section transfers the image data having the first resolution to the display driver via the first transmission line and the second transmission line, and in a case of transferring image data having a second resolution which is lower than the first resolution, the image transferring section (i) stops operation of the first transmission line and (ii) transfers the image data having the second resolution to the display driver via the second transmission line, wherein when a resolution of the image data to be transferred is switched from the first resolution to the second resolution, the display driver reads out the image data which has the first resolution and is stored in the frame memory, converts the image data having the first resolution into image data having the second resolution, and causes the image data, whose resolution has been thus converted into the second resolution, to be stored in the frame memory. ### Claim 11 A display control device comprising: a display driver including a frame memory which is capable of storing image data having a first resolution; an image transferring section configured to transfer image data to the display driver; and a first transmission line and a second transmission line each of which connects the display driver with the image transferring section, wherein in a case of transferring the image data having the first resolution, the image transferring section transfers the image data having the first resolution to the display driver via the first transmission line and the second transmission line, and in a case of transferring image data having a second resolution which is lower than the first resolution, the image transferring section (i) stops operation of the first transmission line and (ii) transfers the image data having the second resolution to the display driver via the second transmission line, wherein during a period of storing the image data having the second resolution, the frame memory stops memory retaining operation in some of memory regions. ### Claim 12 (depends on 11) The display control device as set forth in claim 11, wherein: the frame memory stops the memory retaining operation in the some of the memory regions by stopping (i) power supply to the some of the memory regions, (ii) supply of a clock signal to the some of the memory regions, or (iii) refresh operation in the some of the memory regions. ### Claim 13 A method of controlling a display control device which includes (i) a display driver, (ii) an image transferring section configured to transfer image data to the display driver, and (iii) a first transmission line and a second transmission line each of which connects the display driver with the image transferring section, wherein: in a case where image data having a first resolution is transferred, the image data having the first resolution is transferred from the image transferring section to the display driver via the first transmission line and the second transmission line; and in a case where image data having a second resolution which is lower than the first resolution is transferred, operation of the first transmission line is stopped and the image data having the second resolution is transferred from the image transferring section to the display driver via the second transmission line, wherein the display driver includes a frame memory which is capable of storing the image data having the first resolution, and wherein in a case of storing the image data having the second resolution, the frame memory skips some of memory addresses.