# US 10,123,000 B2 · Backlight module and stereoscopic display device using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,123,000 B2 - Document ID: US10123000B2 - Status: Granted - Kind: B2 - Application number: 15/270,005 - Filed: 2016-09-20 - Published: 2018-01-25 - Granted: 2018-11-06 - Earliest claimed: 2016-07-20 - Assignees: Delta Electronics, Inc. - Applicants: Delta Electronics, Inc. - Inventors: June-Jei Huang - Web page: https://patentgrep.com/patent/US10123000B2 ## CPC - H04N 13/305: using lenticular lenses, e.g. arrangements of cylindrical lenses - G02B 6/003: {Lens or lenticular sheet or layer} - G02B 6/0038: {Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide} - G02B 6/0061: {to provide homogeneous light output intensity} - G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources} - G02B 30/24: involving temporal multiplexing, e.g. using sequentially activated left and right shutters - H04N 13/32: using arrays of controllable light sources; using moving apertures or moving light sources - H04N 13/398: Synchronisation thereof; Control thereof - H05B 47/16: by timing means - H04N 2213/001: Constructional or mechanical details - Y02B 20/40: Control techniques providing energy savings, e.g. smart controller or presence detection - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A backlight module includes a light source module, a light timing control unit, a light guide plate and a lenticular lens. The light source module includes first light sources and second light sources. The lenticular lens disposed beside a side surface of the light guide plate and optically coupled between the light source module and the light guide plate, the lenticular lens having a central axis and a plurality of lenticular units. Each lenticular unit has a central optical axis, and one of the first light sources covered by one of the lenticular units is symmetrically disposed with respect to the central optical axis of the lenticular unit covering the first light source, at least two of the second light sources covered by one of lenticular units are disposed symmetrically with respect to the central optical axis of the lenticular unit covering the second light sources. ## Claims ### Claim 1 A backlight module, comprising: a light source module comprising a plurality of first light sources and a plurality of second light sources; a light timing control unit configured to control light-emitting times of the first light sources to be different from light-emitting times of the second light sources; a light guide plate comprising at least one main surface and a side surface that are adjacent to each other, an area of the main surface being larger than an area of the side surface; and a lenticular lens disposed beside the side surface of the light guide plate and optically coupled between the light source module and the light guide plate, the lenticular lens having a central axis and a plurality of lenticular units, wherein each of the lenticular units has a central optical axis, and one of the first light sources covered by one of the lenticular units is symmetrically disposed with respect to the central optical axis of the lenticular unit covering the first light source, at least two of the second light sources covered by one of the lenticular units are disposed symmetrically with respect to the central optical axis of the lenticular unit covering the second light sources, and the first light sources and the second light sources are symmetrically arranged with respect to the central axis in an alternating manner. ### Claim 2 (depends on 1) The backlight module of claim 1, wherein two of the lenticular units have equal overlapping areas with the respectively covering first light sources, and two of the lenticular units have equal overlapping areas with the respectively covering second light sources. ### Claim 3 (depends on 2) The backlight module of claim 2, wherein the light timing control unit is configured to control the first light sources covered by the different lenticular units to emit light synchronously, and the light timing control unit is configured to control the second light sources covered by the different lenticular units to emit light synchronously. ### Claim 4 (depends on 1) The backlight module of claim 1, wherein the first light sources and the second light sources are disposed on a focal plane of the lenticular lens. ### Claim 5 (depends on 1) The backlight module of claim 1, wherein the light source module further comprises a plurality of auxiliary light sources and the light timing control unit is configured to control light-emitting times of the auxiliary light sources to be different from light-emitting times of the first light sources and light-emitting times of the second light sources, wherein the first light sources, the second light sources and the auxiliary light sources are arranged in the alternating manner. ### Claim 6 (depends on 1) The backlight module of claim 1, wherein the light guide plate has a plurality of cylindrical structures, and the cylindrical structures are disposed on the main surface, and sizes of the cylindrical structures are increasing along a direction away from the light source module. ### Claim 7 (depends on 6) The backlight module of claim 6, wherein at least one of the cylindrical structures has a lengthwise axis being substantially parallel with an arranged direction of the first light sources and the second light sources. ### Claim 8 (depends on 6) The backlight module of claim 6, wherein depths of the cylindrical structures are increasing along the direction away from the light source module. ### Claim 9 (depends on 6) The backlight module of claim 6, wherein widths of the cylindrical structures are increasing along the direction away from the light source module. ### Claim 10 (depends on 6) The backlight module of claim 6, wherein arrangement densities of the cylindrical structures are increasing along the direction away from the light source module. ### Claim 11 A stereoscopic display device, comprising: a backlight module, comprising: a light source module comprising a plurality of first light sources and a plurality of second light sources; a light timing control unit configured to control light-emitting times of the first light sources to be different from light-emitting times of the second light sources; a light guide plate comprising at least one main surface and a side surface that are adjacent to each other, an area of the main surface being larger than an area of the side surface; and a lenticular lens disposed beside the side surface of the light guide plate and optically coupled between the light source module and the light guide plate, the lenticular lens having a central axis and a plurality of lenticular units, wherein each of the lenticular units has a central optical axis, and one of the first light sources covered by one of the lenticular units is symmetrically disposed with respect to the central optical axis of the lenticular unit covering the first light source, at least two of the second light sources covered by one of the lenticular units are disposed symmetrically with respect to the central optical axis of the lenticular unit covering the second light sources, and the first light sources and the second light sources are symmetrically arranged with respect to the central axis in an alternating manner; a display panel; and an image switch control unit configured to control the display panel to display images time sequentially, wherein the first light sources and the second light sources are switched synchronously with the images. ### Claim 12 (depends on 11) The stereoscopic display device of claim 11, wherein two of the lenticular units have equal overlapping areas with the respectively covering first light sources covered, and two of the lenticular units have equal overlapping areas with the respectively covering second light sources. ### Claim 13 (depends on 11) The stereoscopic display device of claim 11, wherein the light timing control unit is configured to control the first light sources covered by the different lenticular units to emit light synchronously, and the light timing control unit is configured to control the second light sources covered by the different lenticular units to emit light synchronously. ### Claim 14 (depends on 11) The stereoscopic display device of claim 11, wherein the first light sources and the second light sources are disposed on a focal plane of the lenticular lens. ### Claim 15 (depends on 11) The stereoscopic display device of claim 11, wherein the light source module further comprises a plurality of auxiliary light sources and the light timing control unit is configured to control light-emitting times of the auxiliary light sources to be different from light-emitting time of the first light sources and light-emitting time of the second light sources, wherein the first light sources, the second light sources and the auxiliary light sources are arranged in the alternating manner. ### Claim 16 (depends on 11) The stereoscopic display device of claim 11, wherein the light guide plate has a plurality of cylindrical structures, and the cylindrical structures are disposed on the main surface, and the cylindrical structures have increasing sizes along a direction away from the light source module. ### Claim 17 (depends on 16) The stereoscopic display device of claim 16, wherein at least one of the cylindrical structures has a lengthwise axis being substantially parallel with an arranged direction of the first light sources and the second light sources. ### Claim 18 (depends on 16) The stereoscopic display device of claim 16, wherein depths of the cylindrical structures are increasing along the direction away from the light source module. ### Claim 19 (depends on 16) The stereoscopic display device of claim 16, wherein widths of the cylindrical structures are increasing along the direction away from the light source module. ### Claim 20 (depends on 16) The stereoscopic display device of claim 16, wherein arrangement densities of the cylindrical structures are increasing along the direction away from the light source module.