Source: https://patents.google.com/patent/WO2011013889A1/en
Timestamp: 2020-01-18 20:05:28
Document Index: 42909599

Matched Legal Cases: ['art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'arts 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 70', 'art 70', 'art 72', 'art 15', 'art 74', 'art 72', 'art 72', 'art 62', 'art 74']

WO2011013889A1 - Backlight unit and display apparatus including the same - Google Patents
WO2011013889A1
WO2011013889A1 PCT/KR2010/001423 KR2010001423W WO2011013889A1 WO 2011013889 A1 WO2011013889 A1 WO 2011013889A1 KR 2010001423 W KR2010001423 W KR 2010001423W WO 2011013889 A1 WO2011013889 A1 WO 2011013889A1
PCT/KR2010/001423
Bup-Sung Jung
2009-07-30 Priority to US61/229,854 priority
2009-08-06 Priority to US23180209P priority
2009-08-06 Priority to US61/231,802 priority
2010-03-08 Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
2011-02-03 Publication of WO2011013889A1 publication Critical patent/WO2011013889A1/en
239000000758 substrates Substances 0 description 65
In one embodiment, a backlight unit includes a substrate; a light source on the substrate, the light source emitting light with a predetermined orientation angle with respect to a first direction; and N (N is 2 or greater) light guide panels each including: a light incident part having a light incident surface to light from the light source is laterally incident; and a light emitting part emitting the incident light upward, wherein at least one portion of the light emitting part of a Kth (K is one of 1 to N-1) light guide panel of the N light guide panels is disposed on an upper side of the light incident part of a K+1th light guide panel, and the light emitting part of the Kth light guide panel is spaced a first distance from the light emitting part of the K+1th light guide panel.
In another embodiment, a backlight unit includes a substrate; a light source on the substrate, the light source emitting light with a predetermined orientation angle with respect to a first direction; and a plurality of light guide panels each including: a light incident part having a light incident surface to light from the light source is laterally incident; and a light emitting part emitting the incident light upward, wherein the light emitting part of the light guide panel includes a portion that decreases in thickness from a side adjacent to the light incident part to a side distant from the light incident part, the light guide panels includes N (N is 2 or greater) light guide panels arrayed in the first direction, and M (M is 2 or greater) light guide panels arrayed in a perpendicular direction to the first direction, the light emitting part of a Kth (K is one of 1 to N-1) light guide panel of the N light guide panels is spaced a first distance from the light emitting part of a K+1th light guide panel, and the light emitting part of an Lth (L is one of 1 to M-1) light guide panel of the M light guide panels is spaced a second distance from the light emitting part of an L+1th light guide panel.
In further another embodiment, a display apparatus includes: a backlight unit divided into a plurality of blocks and dividedly drivable in a block unit; and a display panel on an upper side of the backlight unit, wherein the backlight unit includes: a substrate; a light source on the substrate, the light source emitting light with a predetermined orientation angle with respect to a first direction; and N (N is 2 or greater) light guide panels each including: a light incident part having a light incident surface to light from the light source is laterally incident; and a light emitting part emitting the incident light upward, wherein at least one portion of the light emitting part of a Kth (K is one of 1 to N-1) light guide panel of the N light guide panels is disposed on an upper side of the light incident part of a K+1th light guide panel, and the light emitting part of the Kth light guide panel is spaced a first distance from the light emitting part of the K+1th light guide panel.
A backlight unit includes: N light guide panels arranged in a first direction, N being at least 2, a light guide panel having a light incident section to receive light from the first direction and a light emitting section adjacent to the light incident section to emit light received from the light incident section in a second direction, the first and second directions being different directions; and a plurality of light sources, the incident section of the light guide panel being adjacent to at least one light source, wherein a portion of the light emitting section of a Kth (K is one of 1 to N-1) light guide panel overlaps a portion of the light incident section of a K+1th light guide panel, and the light emitting section of the Kth light guide panel is spaced a first distance from the light emitting section of the K+1th light guide panel.
A backlight unit comprises: M light guide panels, M being at least 2, a light guide panel having a light incident section to receive light from the first direction and a light emitting section adjacent to the light incident section to emit light received from the light incident section in a second direction, the first and second directions being different directions and the M light guide panels being arranged in the second direction; and a plurality of light sources, the incident section of the light guide panel being adjacent to at least one light source, wherein the light emitting section of an Lth light guide panel (L is one of 1 to M-1) of the M light guide panels is spaced a first distance from the light emitting section of an L+1th light guide panel.
A display apparatus includes the back light unit of above, wherein the display apparatus further comprises: a display panel provided over the back light unit; and a drive unit for supplying drive power to at least one of the display panel or the light sources, wherein the NxM light guide panels are divided into a plurality of division driving areas, wherein the light guide panels in at least one division driving area emit light independently from the light guide panels in at least one other division driving areas such that a brightness of the at least one division driving area is different from brightness of the at least one other division driving areas.
Fig. 16 is a perspective view of two light guide panels that are aligned of Fig 15.
According to the current embodiment, the light source 13 may include one or more light emitting diodes (LEDs). For example, the light source 13 including an LED may emit light with a predetermined orientation angle of about 120 with respect to a direction in which the light emitting surface is oriented.
Fig. 3 is a plan view illustrating the front side of the backlight unit 100. Referring to Fig. 3, the optical assemblies 10 of the backlight unit 100 may be arrayed in an N x M matrix (N is the number of rows arrayed along a y-axis direction, M is the number of columns arrayed along an x-axis direction, and M and N are natural numbers equal to 2 or greater). Each of the optical assemblies 10 may include the light source 13 and the light guide panel 15.
The light source 13 may emit light with a predetermined orientation angle, e.g. with an orientation angle of about 120 with respect to a first direction (denoted by an arrow), that is, with respect to a parallel direction to a y-axis. Light emitted from the light source 13 is laterally incident to the lower end of the light guide panel 15 and then may travel to the upper end of the light guide panel 15.
For example, the backlight unit 100 may include the nine optical assemblies 10 (M1 to M9) in a 3 x 3 matrix as illustrated in Fig. 3, but the present disclosure is not limited thereto. Thus, the matrix of the optical assemblies 10 can be varied according to a screen size of a display apparatus.
The light guide panels 15 adjacent in the first direction, that is, in the y-axis direction may be spaced the distance d2 from each other. That is, when the number of rows of the light guide panels 15 arrayed in the first direction in which light is emitted is N as described above, a Kth one (K is one of 1 to N-1) of the N light guide panels 15 arrayed in the first direction may be spaced the distance d2 from an adjacent K+1th one.
When the number of columns of the light guide panels 15 arrayed in the perpendicular direction to the first direction is M, an Lth one (L is one of 1 to M-1) of the M light guide panels 15 arrayed in the perpendicular direction to the first direction may be spaced the distance d1 from an adjacent L+1th one.
The light guide panel 15 may include a first part 15b and a second part 15b. The second part 15a may include an upper surface generating a surface light source, a lower surface facing the upper surface, and four side surfaces.
The first part 15b may horizontally protrude from one of the side surfaces of the second part 15a along the lower portion of the side surface. The first part 15b may be a light incident part having a light incident surface to which light is incident from the light source 13, and the second part 15a may be a light emitting part that emits light, laterally incident through the light incident part, to the upper side, thus substantially providing the light to the display panel 210.
According to the embodiment, adjacent optical assemblies 10, and particularly, two adjacent light guide panels 15, may overlap each other in a predetermined area. For example, the light source 13, the first part 15b, i.e., the light incident part, and the side cover 20 are disposed on one side of the optical assembly 10, and the light source 13, the first part 15b, and the side cover 20 may be disposed under the adjacent optical assembly 10, and particularly, under the second part 15a of the adjacent optical assembly 10, that is, under the light emitting part.
That is, as described above, when the number of rows of the light guide panels 15 arrayed along the first direction in which light is emitted from the light source 13 is N, the light emitting part of the light guide panel 15 in a Kth row (K is one of 1 to N-1) of the N rows may be disposed above and overlap the light incident part of the light guide panel 15 in a K+1th row.
The optical assemblies 10 partially overlap each other to hide the light source 13, the first part 15b, and the side cover 20 from the front side. As described above, the adjacent optical assemblies 10 of the backlight unit 100 overlap each other to prevent a bright line or a dark line at the boundary of the optical assemblies 10 and improve the uniformity of light.
As illustrated in Fig. 6, when the adjacent light guide panels 15 overlap each other in a predetermined area, the distance d2 between the adjacent light guide panels 15 may be defined as a distance between portions of the light guide panels 15 emitting light upward. That is, distance d2 may be the distance between second parts 15a, i.e., between the light emitting parts of the adjacent light guide panels 15.
More particularly, when the number of rows of light guide panels 15 arrayed along the first direction in which light is emitted from light source 13 is N, the light emitting part of light guide panel 15 in the Kth row (K is one of 1 to N-1) of the N rows may be spaced distance d2 from the light emitting part of light guide panel 15 in the K+1th row.
The lower surface of the second part 15a of the light guide panel 15 may be inclined at a predetermined angle, so as to gradually decrease in thickness from an adjacent portion to the first part 15b to a distant portion from the first part 15b. That is, the light emitting part of the light guide panel 15 may decrease in thickness from a first side adjacent to the light incident part to a second side distant from the light incident part.
The lower surface of the light guide panel 15 may be provided with the reflecting member 17 that reflects light, laterally incident through the first part 15b and guided in the light guide panel 15, to the upper side. In addition, the reflecting member 17 may prevent interference of light generated between the overlapped optical assemblies 10.
Fig. 7 is a perspective view illustrating the light guide panel 15 of the backlight unit 100. Referring to Figs. 6 and 7, light guide panel 15, and particularly, first part 15b of light guide panel 15 may include a protrusion 30 protruding with a predetermined height 'a' The protrusion 30 may be provided to at least two points in the x-axis direction on the upper surface of the first part 15b of the light guide panel 15.
The shape of the protrusion 30 may be varied. For example, the protrusion may have a rectangular parallelepiped shape. The protrusion(s) 30 is/are caught by first side cover 21 to prevent the shaking of light guide panel 15 along the x-axis and the y-axis. An edge 30a of the protrusion 30 may be rounded to prevent a case that a crack is formed at the protrusion 30 by shock due to the movement of light guide panel 15.
The height 'a' of protrusion 30 may range from about 0.1 to 0.6 mm from the upper surface of first part 15b, and a width 'b' ranging from about 2 to 5 mm along the x-axis. The protrusion may have a width 'c' ranging from about 1 to 3 mm along the y-axis.
The protrusion 30 may be disposed between neighboring LEDs 11 and adjacent to a light incident surface 16 on the upper surface of the first part 15b, so as to prevent optical interference of light emitted from the LEDs 11 due to the protrusion 30 integrally formed with the light guide panel 15.
The light source 13 may include at least one of the LEDs 11, and module substrate 12 to which LEDs 11 are mounted. The LEDs 11 may be arrayed along the x-axis on the module substrate 12 and adjacent to the light incident surface 16 of the first part 15b.
Light emitted from the LED 11 is laterally incident to the first part 15b. Colors of light incident from the LEDs 11 may be mixed in the light guide panel 15 including the first part 15b.
Light emitted from the LEDs 11 is guided in the first part 15b and incident to the second part 15a. The light incident to the second part 15a is reflected upward from the reflecting member 17 disposed on the lower surface of the second part 15a. At this point, the diffusion pattern disposed on the lower surface of the light guide panel 15 diffuses and spreads the light to improve the uniformity of the light.
The distance between a portion of the LEDs 11 may be greater than the distance between the other LEDs 11 to secure a coupling space of the first side cover 21 and the second side cover 22 and minimize optical effect due to coupling force for pressing the light guide panel 15. For example, when a first distance 'd' between the adjacent LEDs 11 is about 10 mm, a second distance 'e' of LEDs 11 around the coupling space may be about 13 mm. The colors of light emitted from the LEDs 11 are mixed in the light guide panel 15 including the first part 15b to uniformly provide the light to the second part 15a.
The side cover 20, surrounding the light source 13 and a portion of the light guide panel 15, may include the first side cover 21 disposed on the light source 13 and the first part 15b of the light guide panel 15, and the second side cover 22 disposed under the first part 15b. The side cover 20 may be formed of plastic or metal.
The second side cover 22, facing the lower surface of the first part 15b, may be bent upward (along a z-axis) at the lower surface of the first part 15b to face the light incident surface 16. A portion 22a of the second side cover 22 may be inclined along the lower surface of the light guide panel 15, that is, along an inclined surface of the light guide panel 15. The second side cover 22 may accommodate the light source 13.
The second side cover 22 supports the inclined surface of the light guide panel 15 to firmly maintain alignment of the light guide panel 15 with the light source 13 and protect the light guide panel 15 and the light source 13 from external shock. The first side cover 21 may have first holes 41 at positions corresponding to the protrusions 30 of the first part 15b.
Fig. 10 is a perspective view illustrating a reflecting element and a substrate according to an embodiment. Referring to Fig. 10, at least one portion of the reflecting member 17 of the optical assembly 10 is placed on the substrate 14. The portion of the reflecting member 17 placed on the substrate 14 is provided with holes 17a, 17b, 17c, and 17d through which the light sources 13 arrayed on the substrate 14 pass.
In more detail, the holes 17a, 17b, 17c, and 17d have shapes and sizes corresponding to the light sources 13, and disposed at positions corresponding to the light sources 13. Thus, when assembling the optical assembly 10, the light sources 13 are inserted into the holes 17a, 17b, 17c, and 17d of the reflecting member 17, so that the position of the reflecting member 17 relative to the substrate 14 can be fixed.
Referring to Figs. 15 and 16, the light incident part 15b of the light guide panel 15 of the optical assembly 10 is provided with a fixing part 70 where a fixing member 60, for fixing the light guide panel 15 to the substrate 14 or the bottom cover 110, is disposed.
The fixing part 70 includes a recess part 72 that is disposed in the upper surface 152 of the light incident part 15b, and a through part 74 that passes through the lower side of the recess part 72. The recess part 72 is recessed with a diameter and a thickness corresponding to a head part 62 of the fixing member 60. A fixing member body 64 of the fixing member 60 having a spiral is inserted and fixed to the through part 74.
The present disclosure also provides a "Green" technology for display devices. Presently, the backlight is generally turned on continuously, even when the display of the entire screen is not desirable. For example, the prior art display allows control of the resolution of the entire display screen but not the size of the display screen. However, in certain instances, a smaller screen area may be desirable for lower resolution images. The size of the display area can be controlled based on the present disclosure. For example, instead of viewing images and programs in 42 inch display, the display screen size can be reduce to 32 inches by turning off the light sources for appropriate number of light guide plates located at the periphery of the display device. As can be appreciated, the location and size of the display area can be controlled based on program or user needs. As can be appreciated, multiple configuration may be possible based on turning on or off the light sources for appropriate number of light guide plates (light guide panels or light guide modules or assemblies) based on application and user configuration.
a portion of the light emitting section of a Kth (K is one of 1 to N-1) light guide panel overlaps a portion of the light incident section of a K+1th light guide panel, and
The backlight unit of claim 1, wherein the first distance corresponds to a gap and substantially no discontinuity of light on a display device is visible.
The backlight unit of claim 1, wherein the first distance corresponds to a gap that produces a substantially uniform display brightness including at boundaries between the Kth and Kth+1 light guide panels.
The backlight unit of claim 1, wherein the light emitting section of the light guide panel includes a section that decreases in thickness from a first point to a second point, wherein the first point is closer to the light incident section than the second point.
The backlight unit of claim 1, further comprising M (M is 2 or greater) light guide panels arranged in the second direction, wherein the light emitting section of an Lth light guide panel (L is one of 1 to M-1) of the M light guide panels is spaced a second distance from the light emitting section of an L+1th light guide panel.
The backlight unit of claim 1, wherein the first distance ranges from about 0.1 to 5.0 mm.
The backlight unit of claim 1, wherein the first distance ranges from about 0.3 to 2.5 mm.
The backlight unit of claim 5, wherein the second distance ranges from about 0.1 to 7.0 mm.
The backlight unit of claim 5, wherein the second distance ranges from about 0.3 to 2.5 mm.
The backlight unit of claim 5, wherein the second distance is greater than the first distance.
The backlight unit of claim 5, wherein the second distance ranges from the first distance to two times the first distance.
A display apparatus having the back light unit of claim 1, wherein the display apparatus further comprises:
The display apparatus of claim 5, wherein the NxM light guide panels are divided into a plurality of division driving areas, wherein the light guide panels in at least one division driving area emit light independently from the light guide panels in at least one other division driving areas such that a brightness of the at least one division driving area is different from brightness of the at least one other division driving areas.
the light emitting section of an Lth light guide panel (L is one of 1 to M-1) of the M light guide panels is spaced a first distance from the light emitting section of an L+1th light guide panel.
The backlight unit of claim 14, wherein the first distance is a gap, and no discontinuity of light is visible.
The backlight unit of claim 14, wherein the first distance ranges from about 0.1 to 7.0 mm.
The back light unit of claim 14, further comprising a plurality of N light guide panels arranged in the first direction, N being at least 2, the light emitting section of the Kth light guide panel is spaced a second distance from the light emitting section of the K+1th light guide panel, K being one of 1 to N-1, wherein the first distance is greater than the second distance.
The backlight unit of claim 17, wherein the first distance is no greater than two times the second distance.
The backlight unit of claim 17, wherein a portion of the light emitting section of the Kth light guide panel of the N light guide panels arrayed in the first direction overlaps a portion of the light incident section of the K+1th light guide panel.
A display apparatus having the back light unit of claim 17, wherein the display apparatus further comprises:
a drive unit for supplying drive power to at least one of the display panel or the light sources, wherein the NxM light guide panels are divided into a plurality of division driving areas, wherein the light guide panels in at least one division driving area emit light independently from the light guide panels in at least one other division driving areas such that a brightness of the at least one division driving area is different from brightness of the at least one other division driving areas.
PCT/KR2010/001423 2009-07-30 2010-03-08 Backlight unit and display apparatus including the same WO2011013889A1 (en)
US61/229,854 2009-07-30
US23180209P true 2009-08-06 2009-08-06
US61/231,802 2009-08-06
WO2011013889A1 true WO2011013889A1 (en) 2011-02-03
PCT/KR2010/001423 WO2011013889A1 (en) 2009-07-30 2010-03-08 Backlight unit and display apparatus including the same
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