# US 2014/0152536 A1 · Backlight Scanning Method, Backlight Scanning Device And Liquid Crystal Display Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152536 A1 - Document ID: US20140152536A1 - Status: Published application - Kind: A1 - Application number: 13/996,113 - Filed: 2012-10-16 - Published: 2014-06-05 - Earliest claimed: 2012-07-17 - Assignees: Boe Technology Group Co., Ltd. - Applicants: BOE Technology Group Co., Ltd. - Inventors: Lilei Zhang - Web page: https://patentgrep.com/patent/US20140152536A1 ## CPC - G09G 3/3406: {Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336)} - G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side} - G09G 3/342: {using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines} - G02F 1/133601: {for spatial active dimming} - G09G 2310/0218: with collection of electrodes in groups for n-dimensional addressing - G09G 2310/024: Scrolling of light from the illumination source over the display in combination with the scanning of the display screen - 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) - 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 ## Abstract There are provided a backlight scanning method and a device thereof. The method comprises: dividing an edge lighting type backlight source into an upper side optical region and a lower side optical region; turning on the light sources at the upper and lower sides respectively after the response of the liquid crystal corresponding to the pixels in the last row of the upper and lower side optical regions is stationary; turning off the light sources at the upper and lower sides respectively when the next response period of the liquid crystal corresponding to the pixels in the first row of the upper and lower side optical regions starts. The method solves the difficulties of applying the scanning backlight to the edge lighting type backlight source by respectively controlling the timings of turning on and off the light sources at the upper and lower sides, whereby the application scope of the scanning backlight is broadened. ## Claims ### Claim 1 A backlight scanning method used for a backlight source, the backlight source being an edge lighting type backlight source and comprising light sources and a light guiding element, the light sources being disposed on upper and lower sides of the light guiding element, and the light guiding element comprising an upper side optical region and a lower side optical region that are parallel to each other, the method comprising: turning on the light sources at the upper and lower sides respectively after the response of the liquid crystal corresponding to the pixels in the last row of the upper and lower side optical regions is stationary; and turning off the light sources at the upper and lower sides respectively when the next response period of the liquid crystal corresponding to the pixels in the first row of the upper and lower side optical regions starts. ### Claim 2 (depends on 1) The method according to claim 1, wherein the light guiding element forms the upper side and the lower side optical regions that are parallel to each other by forming a seam in a horizontal position in the middle of the light guiding element. ### Claim 3 (depends on 2) The method according to claim 2, wherein the two joint surfaces of the light guiding element joining each other at the seam are reflective surfaces. ### Claim 4 (depends on 1, 2, 3) The method according to any one of claims 1-3, wherein the response period of the pixel liquid crystal and the refresh frequency of the liquid crystal display are reciprocal to each other. ### Claim 5 A backlight scanning device, comprising a driving circuit, an edge lighting type backlight source, and a backlight source control circuit, wherein the edge lighting type backlight source comprises an upper side and a lower side optical regions, and an upper side and a lower side light sources corresponding to the upper side and the lower side optical regions respectively; the backlight source control circuit is adapted for sending control signals to the driving circuit after the response of the liquid crystal corresponding to the pixels in the last row of the upper and lower side optical regions is stationary and when the next response period of the liquid crystal corresponding to the pixels in the first row of the upper and lower side optical regions starts; and the driving circuit is adapted for turning on the upper and lower side light sources according to the control signal that is sent out after the response of the liquid crystal corresponding to the pixels in the last row of the upper and lower side optical regions is stationary, and turning off the upper and lower side light sources according to the control signal that is sent out when the next response period of the liquid crystal corresponding to the pixels in the first row of the upper and lower side optical regions starts. ### Claim 6 (depends on 5) The backlight scanning device according to claim 5, wherein the edge lighting type backlight source comprises a light guiding element which is provided with a seam in a horizontal position in the middle, the seam dividing the light guiding element into an upper side optical region and a lower side optical region.. ### Claim 7 (depends on 6) The backlight scanning device according to claim 6, wherein the two joint surfaces of the light guiding element joining each other at the seam are reflective surfaces. ### Claim 8 (depends on 5, 6, 7) The backlight scanning device according to any one of claims 5-7, wherein the response period of the pixel liquid crystal and the refresh frequency of the liquid crystal display are reciprocal to each other. ### Claim 9 (depends on 5) The backlight scanning device according to claim 5, wherein the light sources are point light sources or linear light sources. ### Claim 10 (depends on 5, 6, 7, 8, 9) A liquid crystal display device, comprising the backlight scanning device according to any one of claims 5-9.