Source: https://patents.google.com/patent/KR101252846B1/en
Timestamp: 2020-06-02 15:56:00
Document Index: 739188372

Matched Legal Cases: ['arts 191', 'art 191', 'arts 191', 'arts 191', 'arts 191', 'arts 191', 'arts 191']

KR101252846B1 - Backlight assembly and liquid crystal display device having the same - Google Patents
KR101252846B1
KR101252846B1 KR1020060038650A KR20060038650A KR101252846B1 KR 101252846 B1 KR101252846 B1 KR 101252846B1 KR 1020060038650 A KR1020060038650 A KR 1020060038650A KR 20060038650 A KR20060038650 A KR 20060038650A KR 101252846 B1 KR101252846 B1 KR 101252846B1
KR1020060038650A
KR20070106134A (en
2006-04-28 Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
2006-04-28 Priority to KR1020060038650A priority Critical patent/KR101252846B1/en
2007-11-01 Publication of KR20070106134A publication Critical patent/KR20070106134A/en
2013-04-09 Publication of KR101252846B1 publication Critical patent/KR101252846B1/en
The present invention provides a backlight assembly and a liquid crystal display device having the same, which improve color mixing and facilitate heat dissipation. The disclosed backlight assembly includes a bottom case, a printed circuit board disposed to have a predetermined slope on the bottom case, and a plurality of light emitting diodes mounted on the printed circuit board.
Bottom case, support, color mixing, heat dissipation
1 is an exploded perspective view showing a direct type liquid crystal display device according to a first embodiment of the present invention.
FIG. 2 is a detailed view of a bottom case and a printed circuit board showing region A of FIG. 1. FIG.
FIG. 3 is a cross-sectional view of the liquid crystal display of the first exemplary embodiment of FIG. 1 taken along the line II ′. FIG.
4 is an exploded perspective view illustrating a direct type liquid crystal display device according to a second embodiment of the present invention.
FIG. 5 is a detailed view of a bottom case and a printed circuit board illustrating region B of FIG. 4.
FIG. 6 is a cross-sectional view of the liquid crystal display of the second exemplary embodiment of FIG. 4 taken along the line II-II '; FIG.
110: liquid crystal panel 120: backlight assembly
130: optical sheet 150: light emitting diode
160 and 260: printed circuit boards 161 and 162: first and second substrates
170: reflector 180, 280: bottom case
191, 192: first and second supports 193, 194: first and second holes
291: protrusions 283, 285: first and second support surfaces
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight assembly, and more particularly, to a backlight assembly and a liquid crystal display including the same, which improve color mixing and facilitate heat dissipation.
Liquid crystal display devices have been used in various fields as well as notebook PC and monitor market due to small size, light weight and low power consumption.
Since the liquid crystal display is a light-receiving device that displays an image by controlling the amount of light coming from the outside, a backlight assembly for irradiating light to the liquid crystal panel is required.
The backlight assembly is classified into an edge type and a direct type according to the shape of the light source. The edge type backlight assembly includes a light guide plate at a side surface and a light guide plate provided at a rear surface of the liquid crystal panel to guide light emitted from the side to the front. The direct type backlight assembly includes a plurality of light sources at the rear of the liquid crystal panel, and the light emitted from the plurality of light sources is directly irradiated to the liquid crystal panel in front of the liquid crystal panel.
As the light source of the backlight assembly, an EL (Electro Luminescence), a Cold Cathode Fluorescent Lamp (CCFL), a Hot Cathode Fluorescent Lamp (HCFL), a light emitting diode (LED), and the like are used.
In the CCFL backlight assembly, mercury encapsulated inside a fluorescent lamp forms an amalgam easily by combining with a metal, thereby degrading the life of the lamp, causing a great change in luminance due to temperature change, and using heavy mercury, which is a heavy metal. The disposal of the waste is a problem.
In order to solve such a problem, a light emitting diode (LED) is used.
In the backlight assembly using the light emitting diodes, a plurality of light emitting diodes are disposed on the bottom case at predetermined intervals, and optical sheets for diffusing and condensing light are disposed on the light emitting diodes at predetermined intervals.
The plurality of light emitting diodes are further provided with reflecting plates for reflecting light.
The plurality of light emitting diodes are point light sources and are formed of a combination of at least one of a plurality of red, green, blue, and white.
The light emitting diode is a point light source, and a luminance difference occurs between a region where the light emitting diode is disposed and a region where the light emitting diode is not disposed. In order to prevent the above luminance difference, a mixing plate for mixing red (R), green (G), and blue (B) light emitted from the light emitting diode into white (W) light is separately provided on the light emitting diode. Alternatively, the distance between the optical sheets and the light emitting diode should be wide.
Accordingly, when the separate structure such as the mixing plate for color mixing is provided, there are problems such as an increase in the material cost and an increase in the weight of the liquid crystal display device. When the mixing plate is not provided, the optical sheets and the light emitting diode are not included. There was a problem that it is difficult to slim at a wide interval.
In addition, the liquid crystal display device having the above structure has a problem of causing a decrease in life of the light emitting diode due to heat generated when the light emitting diode is driven.
An object of the present invention is to provide a backlight assembly capable of improving color mixing of light emitted from a light emitting diode and a liquid crystal display device having the same.
In addition, an object of the present invention is to provide a backlight assembly capable of improving heat dissipation and a liquid crystal display device having the same.
In order to achieve the above object, a backlight assembly according to a first embodiment of the present invention,
A printed circuit board disposed to have a predetermined slope on the bottom case; And
It includes a plurality of light emitting diodes mounted on the printed circuit board.
In addition, the liquid crystal display device according to the second embodiment of the present invention,
A printed circuit board disposed to have a predetermined slope on the bottom case;
A plurality of light emitting diodes mounted on the printed circuit board; And
It includes a liquid crystal panel for displaying a predetermined image using the light emitted from the light emitting diode.
1 is an exploded perspective view illustrating a direct type liquid crystal display device according to a first embodiment of the present invention, and FIG. 2 is a detailed view illustrating assembly of a bottom case and a printed circuit board of region A of FIG. 1.
As shown in FIG. 1 and FIG. 2, the direct type liquid crystal display according to the first embodiment of the present invention includes a liquid crystal panel 110 for displaying an image and a backlight assembly for irradiating light to the liquid crystal panel 110. 120.
The backlight assembly 120 includes a bottom case 180, a plurality of light emitting diodes 150 disposed on the bottom case 180 at predetermined intervals, and a print disposed on a rear surface of the plurality of light emitting diodes 150. An optical sheet for diffusing and condensing light disposed on a front surface of the circuit board 160, the reflective plate 170 disposed on the back surface of the printed circuit board 160, and the plurality of light emitting diodes 150. 130).
The plurality of light emitting diodes 150 may be formed of a combination of light emitting diodes 150 emitting red, green, and blue light as point light sources. In addition, the light emitting diodes 150 may include a plurality of light emitting diodes 150 emitting white light.
The printed circuit board 160 has a conductive pattern to which a driving voltage is applied to drive the light emitting diode 150.
The printed circuit board 160 is bent in a '∧' shape to have a predetermined inclination from the bottom surface of the bottom case 180, and two surfaces of the printed circuit board 160 are based on the bent region. It is defined as (162). The first substrate 161 and the second substrate 162 have slopes corresponding to each other. The plurality of light emitting diodes 150 are mounted on the first substrate 161 and the second substrate 162.
The printed circuit board 160 is bent in a '∧' shape having a predetermined inclination to change the optical path by arranging the light emitting diodes 150 inclined.
One side of the bottom case 180 is formed with a plurality of first support parts 191 for supporting the printed circuit board 160 at a predetermined distance, and a side surface corresponding to the first support part 191 2 support 192 is formed.
The first and second support parts 191 and 192 protrude a predetermined distance in the inward direction of the bottom case 180 and have a '∧' shape to easily support the '지지' shaped printed circuit board 160. It can be formed as.
A plurality of first holes 193 are formed at one side of the bottom case 180 at a predetermined distance, and a plurality of second holes are disposed at a predetermined distance on the other side corresponding to the first hole 193. 194 is formed.
The first and second holes 193 and 194 are positioned between the bottom case 180 and the first and second support parts 191 and 192.
The first and second holes 193 and 194 are formed to dissipate heat so that the rear surface of the printed circuit board 160 may be in contact with outside air.
The outside air may be circulated through the first or second holes 193 and 194 to emit heat that is generated in the light emitting diodes 150 and conducted to the printed circuit board 160.
The first and second support parts 191 and 192 and the first and second holes 193 and 194 may be formed through a pressing process of the bottom case 180 and may be integrally formed without an additional process.
Both ends of the printed circuit board 160 may be seated on the first and second support parts 191 and 192, and may be fixed by screws or the like.
The light emitting diodes 150 mounted on the first and second substrates 161 and 162 of the printed circuit board 160 may be formed by the bottom case by the first and second substrates 161 and 162 having predetermined slopes. 180 has a predetermined inclination from the rear surface.
Light emitted from the light emitting diodes 150 is inclinedly irradiated directly under the liquid crystal panel 110 by the inclination.
The printed circuit board 160 is disposed in the bottom case 180 by the first and second support parts 191 and 192 to allow the first and second holes 193. 194 and the printed circuit board 160. A tunnel structured passageway is provided which consists of the back side of the.
Accordingly, the liquid crystal display according to the first exemplary embodiment of the present invention emits light by mounting the light emitting diodes 150 on the first and second substrates 161 and 162 of the printed circuit board 160 bent in a '∧' shape. The driving direction of the light emitted from the diode 150 is inclined. As the light irradiated obliquely as described above, the distance until reaching the optical sheets 130 becomes farther, and as a result, color mixing may be improved. As described above, the liquid crystal display according to the first exemplary embodiment improves color mixing of the red (R), green (G), and blue (B) light of the light emitting diodes 150, thereby improving the optical sheet type 130 and the light emitting diodes ( It is possible to narrow the interval between 150), and the narrowing of the interval provides an advantage in slimming.
In addition, the liquid crystal display of the first exemplary embodiment may include first and second holes 193 and 194 around the first and second support portions 191 and 192 of the bottom case 180 supporting the printed circuit board 160. External air passes through the first and second holes 193 and 194 to contact the rear surface of the printed circuit board 160, thereby conducting the light from the light emitting diode 150 to the printed circuit board 160. It can effectively dissipate heat.
As shown in FIG. 3, the components of the liquid crystal display of the first embodiment are the same as those of FIG. 1, and the same reference numerals will be used and detailed description thereof will be omitted.
The printed circuit board 160 is bent in a '∧' shape and consists of first and second substrates 161 and 162 based on the bent area. A plurality of light emitting diodes 150 are mounted on the first and second substrates 161 and 162.
The plurality of light emitting diodes 150 may include a combination of the light emitting diodes 150 emitting red (R), green (G), and blue (B) light, and may have a first and second substrates having predetermined slopes. Mounted on the (161, 162) is arranged to have a predetermined inclination from the front of the bottom case 180.
The light (→) emitted from the light emitting diodes 150 is irradiated obliquely according to the arrangement of the light emitting diodes 150 having a predetermined inclination such that the distance incident to the optical sheets 130 becomes far. Accordingly, the mixing of the red (R), green (G), and blue (B) lights may be improved.
In addition, the liquid crystal display according to the first exemplary embodiment of the present invention improves the mixing of red (R), green (G), and blue (B) light, thereby narrowing the distance between the optical sheet 130 and the light emitting diode 150. Can be.
4 is an exploded perspective view illustrating a direct type liquid crystal display device according to a second exemplary embodiment of the present invention, and FIG. 5 is a detailed view of a bottom case and a printed circuit board of region B of FIG. 4.
As shown in FIGS. 4 and 5, the direct type liquid crystal display according to the second embodiment of the present invention is a printed circuit board of the components of the direct type liquid crystal display according to the first embodiment of FIGS. 1 to 3. All components except for the 260 and the bottom case 280 are the same, and the same reference numerals are used together, and detailed description thereof will be omitted.
The printed circuit board 260 is disposed on the bottom case 280 at predetermined intervals, and on the printed circuit board 260, red (R), green (G), blue (B) and white The light emitting diodes 150 emitting one of the colors (W) are mounted in at least one or more combinations.
The bottom case 280 is provided with a predetermined space therein, and a plurality of protrusions 281 are formed on an inner front surface of the bottom case 280.
The protrusion 281 may extend from one side of the bottom case 280 to the other side.
The protrusion 281 is formed through a press process of the bottom case 280 and may be integrally formed without an additional process.
The protrusion 281 may be formed in a prism shape including first and second support surfaces 283 and 285 having a predetermined slope.
An inverted prism-shaped groove 287 is formed at a rear surface of the bottom case 280 in the region where the protrusion 281 is formed. The groove 287 may be formed on the bottom surface of the bottom case 280 by forming the protrusion 281 by a pressing process.
The first support surface 283 is formed to correspond to the second support surface 285, and the inclination of the first and second support surfaces 283 and 285 is the size of the liquid crystal display and the light emitting diode 150. Depending on the type of disease can be as much as possible.
The printed circuit board 260 may be seated on the first and second support surfaces 283 and 285, and the printed circuit board 260 may be fixed using a screw or the like.
The printed circuit board 260 is mounted on the first and second support surfaces 283 and 285 having a predetermined inclination so that the printed circuit board 260 has a predetermined inclination from the front surface where the protrusion 281 of the bottom case 280 is not formed. Will have Therefore, the light emitting diode 150 mounted on the printed circuit board 260 has a predetermined slope from the front surface of the bottom case 280 like the printed circuit board 260.
The protrusion 281 is formed as described above to arrange the light emitting diodes 150 inclined from the front surface of the bottom case 280.
The light emitting diodes 150 are inclined from the front surface of the bottom case 280 so that the light emitted from the light emitting diodes 150 is inclinedly irradiated.
Therefore, in the direct type liquid crystal display according to the second embodiment, a prism-shaped protrusion 281 is formed on the bottom case 280 to incline the light emitting diodes 150. Accordingly, the light emitted from the light emitting diodes 150 may reach a distance to the optical sheets 130 so that color mixing may be improved. The liquid crystal display device as described above may narrow the gap between the light emitting diodes 150 and the optical sheets 130 and, as a result, may be advantageous in slimming.
In addition, the liquid crystal display according to the second embodiment extends the cross-sectional area of the bottom case 280 that is in contact with the outside air by the grooves 287 formed on the bottom of the bottom case 280, thereby providing the light emitting diodes 150. Release of heat generated from
FIG. 6 is a cross-sectional view of the liquid crystal display of the second exemplary embodiment of FIG. 4 taken along the line II-II '.
As shown in FIG. 6, the components of the liquid crystal display according to the second exemplary embodiment are the same as those of FIG. 4, and the same reference numerals will be used and detailed description thereof will be omitted.
The light (→) emitted from the light emitting diodes 150 is inclinedly irradiated according to the arrangement of the light emitting diodes 150, so that the distance incident to the optical sheets 130 becomes far.
Therefore, in the liquid crystal display according to the second embodiment, light mixing of red (R), green (G), and blue (B) emitted from the light emitting diodes 150 may be improved. In addition, the improved light mixing may narrow the gap between the optical sheets 130 and the light emitting diodes 150, and as a result, may have an advantage in slimming the liquid crystal display device.
In addition, a groove 287 is formed on the bottom of the bottom case 280 to increase the cross-sectional area of the bottom case 280 in contact with the outside air, thereby improving the emission of heat generated from the light emitting diodes 150. have.
As described above, the present invention has an effect of improving color mixing by mounting a light emitting diode on a printed circuit board having a predetermined slope. In addition, the improved color mixing has the advantage of slimming by reducing the distance between the optical sheet and the light emitting diode.
In addition, the present invention has the effect of improving the heat dissipation by contacting the outside air to the back of the printed circuit board by forming a hole on the side of the bottom case.
In addition, the present invention has a prism-shaped protrusion having a predetermined slope on the bottom case is formed to mount the light emitting diode on the inclined surface on the protrusion has the effect of improving the color mixing.
In addition, the present invention has an effect of improving heat dissipation by widening the cross-sectional area of the bottom of the bottom case which is formed in the bottom of the bottom case by the protrusion formed on the bottom case in contact with the outside air.
A plurality of printed circuit boards including a first substrate and a second substrate disposed on the bottom case to have a predetermined slope in a '∧' shape; And
It includes a plurality of light emitting diodes mounted on the printed circuit board,
The bottom case is,
A first support part and a second support part protruding from two inner side surfaces of the bottom case and formed integrally with the bottom case in a '∧' shape to support the printed circuit board;
The side of the bottom case includes a hole formed for the circulation of air in the area between the front of the bottom case and the support,
The printed circuit board is formed on the first support and the second support, the back surface of the printed circuit board, the backlight assembly, characterized in that in direct contact with the outside air.
The plurality of printed circuit board is a backlight assembly, characterized in that extending from one side of the bottom case to the other side.
A plurality of printed circuit boards disposed on the bottom case such that the first and second substrates have a predetermined slope in a '∧' shape;
It includes a liquid crystal panel for displaying a predetermined image using the light emitted from the light emitting diode,
And the printed circuit board is formed on the first and second support parts, and a rear surface of the printed circuit board is in direct contact with external air.
The plurality of printed circuit boards are formed extending from one side of the bottom case to the other side.
KR1020060038650A 2006-04-28 2006-04-28 Backlight assembly and liquid crystal display device having the same KR101252846B1 (en)
KR1020060038650A KR101252846B1 (en) 2006-04-28 2006-04-28 Backlight assembly and liquid crystal display device having the same
US11/581,369 US8052295B2 (en) 2006-04-28 2006-10-17 Backlight assembly and liquid crystal display device having the same
CN200610149825A CN100578315C (en) 2006-04-28 2006-10-25 Backlight assembly and liquid crystal display device having the same
KR20070106134A KR20070106134A (en) 2007-11-01
KR101252846B1 true KR101252846B1 (en) 2013-04-09
ID=38648118
US (1) US8052295B2 (en)
KR (1) KR101252846B1 (en)
CN (1) CN100578315C (en)
KR101432816B1 (en) * 2007-12-04 2014-08-26 엘지디스플레이 주식회사 Backlight unit and liquid crystal display device having the same
CN101614367B (en) * 2008-06-25 2011-12-28 富准精密工业(深圳)有限公司 Light-emitting diode lamp
KR100986541B1 (en) * 2009-03-10 2010-10-07 엘지이노텍 주식회사 Lgiht unit and display apparatus having the same
CN202056688U (en) * 2011-05-19 2011-11-30 京东方科技集团股份有限公司 Backlight source and display device
CN102359716B (en) * 2011-10-17 2016-03-16 康佳集团股份有限公司 A kind of liquid crystal display and flat reflective LED-backlit module thereof
CN102853343B (en) * 2012-09-14 2014-10-22 京东方科技集团股份有限公司 Direct-lit backlight and display
US20170080607A1 (en) * 2015-09-18 2017-03-23 Richard Sahara Angled light source with uniform broad area illumination
CN105258027B (en) * 2015-10-30 2018-11-27 北京京东方茶谷电子有限公司 Backlight module and display device
KR20170083248A (en) 2016-01-08 2017-07-18 엘지전자 주식회사 Display device
CN106054454B (en) * 2016-08-09 2019-06-21 京东方科技集团股份有限公司 A kind of back light source structure and its control method, backlight module, display device
2006-04-28 KR KR1020060038650A patent/KR101252846B1/en active IP Right Grant
2006-10-17 US US11/581,369 patent/US8052295B2/en active Active
2006-10-25 CN CN200610149825A patent/CN100578315C/en active IP Right Grant
KR20070106134A (en) 2007-11-01
CN101063766A (en) 2007-10-31
CN100578315C (en) 2010-01-06
US8052295B2 (en) 2011-11-08
US20070253219A1 (en) 2007-11-01
2012-12-18 J201 Request for trial against refusal decision
2013-01-22 B701 Decision to grant