KR102007830B1 - Backlight unit and liquid crystal display device including the same - Google Patents

Backlight unit and liquid crystal display device including the same Download PDF

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Publication number
KR102007830B1
KR102007830B1 KR1020120093643A KR20120093643A KR102007830B1 KR 102007830 B1 KR102007830 B1 KR 102007830B1 KR 1020120093643 A KR1020120093643 A KR 1020120093643A KR 20120093643 A KR20120093643 A KR 20120093643A KR 102007830 B1 KR102007830 B1 KR 102007830B1
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KR
South Korea
Prior art keywords
led
circuit board
printed circuit
liquid crystal
guide plate
Prior art date
Application number
KR1020120093643A
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Korean (ko)
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KR20140027712A (en
Inventor
정연제
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020120093643A priority Critical patent/KR102007830B1/en
Publication of KR20140027712A publication Critical patent/KR20140027712A/en
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    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Abstract

The present invention is a light guide plate; A first LED assembly positioned on one side of the light guide plate and including a first LED printed circuit board and a first LED mounted on the first LED printed circuit board and having a first color coordinate; A second LED positioned on one side of the light guide plate and mounted on a second LED printed circuit board facing the first LED printed circuit board and the second LED printed circuit board and having a second color coordinate different from the first color coordinate; And a second LED assembly, wherein the first LED and the second LED are alternately disposed.

Description

Backlight unit and liquid crystal display device including the same

The present invention relates to a liquid crystal display device, and more particularly, to a backlight unit capable of providing light of uniform color and luminance and a liquid crystal display device including the same.

Liquid crystal display devices (LCDs), which are used for TVs and monitors due to their high contrast ratio and are advantageous for displaying moving images, are characterized by optical anisotropy and polarization of liquid crystals. The principle of image implementation by

Such a liquid crystal display is an essential component of a liquid crystal panel bonded through a liquid crystal layer between two side-by-side substrates, and realizes a difference in transmittance by changing an arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. do.

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required in order to display the difference in transmittance as an image. To this end, a backlight including a light source is disposed on the back of the liquid crystal panel.

Here, a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp, and a light emitting diode (LED) are used as a light source of the backlight unit. .

Among them, LEDs are particularly widely used as light sources for displays with features such as small size, low power consumption, and high reliability.

1 is a schematic exploded perspective view of a conventional liquid crystal display, and FIG. 2 is a schematic cross-sectional view of a conventional liquid crystal display.

As shown in FIGS. 1 and 2, a general liquid crystal display device includes a liquid crystal panel 10, a backlight unit 20, a main frame 30, a bottom frame 50, and a top frame 40.

The liquid crystal panel 10 is a part that plays a key role in image expression and is composed of first and second substrates 12 and 14 bonded to each other with a liquid crystal layer (not shown) interposed therebetween.

First and second polarizing plates 19a and 19b for selectively transmitting only specific light are attached to the outside of each of the first and second substrates 12 and 14, respectively.

The printed circuit board 17 is connected to a neighboring side of the liquid crystal panel 10 via a connecting member 16 such as a flexible printed circuit board or a tape carrier package (TCP) to form a main frame 30 in the modularization process. Side of the bottom) or the bottom of the bottom frame 50 is appropriately folded close.

The backlight unit 20 is positioned on the rear surface of the liquid crystal panel 10 to supply light to the liquid crystal panel 10.

The backlight unit 20 includes a light emitting diode (LED) assembly 29 arranged along at least one edge length direction of the main frame 30, and a white or silver reflecting plate 25 mounted on the bottom frame 50. ), A light guide plate 23 mounted on the reflective plate 25, and an optical sheet 21 interposed therebetween.

In this case, the LED assembly 29 is located on one side of the light guide plate 23, and includes a plurality of LEDs 29a emitting white light and an LED printed circuit board 29b on which the LEDs 29a are mounted. do.

The liquid crystal panel 10 and the backlight unit 20 have a top frame 40 surrounding the top edge of the liquid crystal panel 10 with the edges surrounded by a rectangular main frame 30, and a backlight unit 20. Bottom frame 50 covering the back of the) is respectively coupled to the front and rear is integrated through the main frame 30.

However, the LED 29a does not have uniform brightness and color. That is, the LED 29a emits light having various color coordinates. Therefore, since light having different luminance and color is supplied depending on the position, the display quality of the liquid crystal display device is deteriorated.

In the present invention, to solve the problem of luminance and color unevenness of the light supplied from the backlight.

In order to solve the above problems, the present invention is a light guide plate; A first LED assembly positioned on one side of the light guide plate and including a first LED printed circuit board and a first LED mounted on the first LED printed circuit board and having a first color coordinate; A second LED positioned on one side of the light guide plate and mounted on a second LED printed circuit board facing the first LED printed circuit board and the second LED printed circuit board and having a second color coordinate different from the first color coordinate; And a second LED assembly, wherein the first LED and the second LED are alternately disposed.

In the backlight unit of the present invention, the first LED is arranged in an odd column of the first LED printed circuit board, and the second LED is arranged in an even column of the second printed circuit board.

In the backlight unit of the present invention, a reflector is positioned on the rear surface of the light guide plate.

In the backlight unit of the present invention, the optical sheet is positioned on the front surface of the light guide plate.

In the backlight unit of the present invention, each of the first and second LEDs is a side-view type in which light is emitted to the side.

In another aspect, the present invention is a liquid crystal panel; A first light guide plate positioned below the liquid crystal panel and positioned on one side of the light guide plate and mounted on a first LED printed circuit board and the first LED printed circuit board and having a first color coordinate; An LED assembly, a second LED printed circuit board disposed on the side of the light guide plate and facing the first LED printed circuit board, and mounted on the second LED printed circuit board and having a second color coordinate different from the first color coordinate; And a backlight unit including a second LED assembly including a second LED, wherein the first LED and the second LED are alternately disposed.

In the liquid crystal display device of the present invention, the liquid crystal display device includes a main frame surrounding the side surface of the backlight unit.

In the liquid crystal display of the present invention, a plurality of protrusions are formed at one side of the main frame to form first and second grooves alternately positioned, and the first LED is inserted into the first groove and the second groove is formed. The LED is characterized in that it is inserted into the second groove.

In the liquid crystal display of the present invention, the first LED is arranged in an odd column of the first LED printed circuit board, and the second LED is arranged in an even column of the second printed circuit board.

In the liquid crystal display of the present invention, the backlight unit may include a reflecting plate positioned on the rear surface of the light guide plate and an optical sheet positioned between the light guide plate and the liquid crystal panel.

In the liquid crystal display of the present invention, each of the first and second LEDs is a side-view type in which light is emitted to the side.

In the backlight unit according to the present invention, by arranging LEDs emitting light of different color coordinates alternately, it has the effect of supplying light having a uniform brightness and color by using the additive mixed color effect.

In addition, LEDs emitting light having a first color coordinate and a second color coordinate are mounted on the first LED printed circuit board and the second LED printed circuit board, respectively, and the first and second LED printed circuit boards are disposed up and down. By providing the backlight unit of the dual batch type, the problem that the brightness and color uniformity are lowered due to an error in the process of mounting the LED on the printed circuit board is prevented.

In addition, the liquid crystal display device including the backlight unit of the present invention has an advantage of realizing an image having a uniform brightness and color.

1 is a schematic exploded perspective view of a conventional liquid crystal display.
2 is a schematic cross-sectional view of a conventional display device.
3 is a schematic plan view of a backlight unit for a liquid crystal display according to a first embodiment of the present invention.
4 is a color coordinate of white light emitted from an LED.
5 is a schematic exploded perspective view of a liquid crystal display according to a second exemplary embodiment of the present invention.
6 is a schematic cross-sectional view of a backlight unit for a liquid crystal display according to a second embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

3 is a schematic plan view of a backlight unit for a liquid crystal display according to a first embodiment of the present invention.

As shown, the backlight unit is disposed under the liquid crystal panel (not shown) to supply light, and includes a light guide plate 110 and an LED assembly 120 positioned at one side of the light guide plate 110.

Although not shown, the backlight unit may include a reflecting plate positioned below the light guide plate and an optical sheet positioned above the light guide plate.

The LED assembly 120 includes an LED printed circuit board 122 and first and second LEDs 124a and 124b arranged on the LED printed circuit board 122. The first and second LEDs 124a and 124b are spaced apart from each other on the LED printed circuit board 122 by surface mount technology (SMT). In addition, the first and second LEDs 124a and 124b have different color coordinates and are alternately arranged.

That is, referring to FIG. 4, which illustrates the color coordinates of the white light emitted from the LED, the white light having the color coordinates of E may be implemented by the LED having the color coordinates of A and the LED having the color coordinates of B. That is, a combination of yellowish white light and blueish white light is used to implement white light of a desired E color coordinate.

It uses the principle of additive color mixture, and can combine the light of different color coordinates as described above to provide light of improved luminance. In addition, brightness is uniformed by arranging the first and second LEDs 124a and 124b having different color coordinates alternately.

As in the prior art, when the LEDs 29a are randomly arranged, a difference occurs in luminance and color per position by the LEDs 29a having different luminance, but as shown in FIG. 3, the first LED has an A color coordinate. By alternately arranging 124a and the second LEDs 124b having the B color coordinates, luminance and color unevenness according to the position can be eliminated.

That is, by alternately arranging the first and second LEDs 124a and 124b having different color coordinates, it is possible to provide light with improved uniformity in brightness and color.

However, in the process of mounting the first and second LEDs 124a and 124b on the LED printed circuit board 122, if the same LEDs are arranged adjacent to each other, the luminance and color are uneven. In addition, since different LEDs are not visually identified, a separate inspection process for lighting the LEDs and sensing light is required to determine such defects.

A backlight and a liquid crystal display device for solving the above problem will be described with reference to FIGS. 5 and 6.

5 is a schematic exploded perspective view of a liquid crystal display according to a second embodiment of the present invention, and FIG. 6 is a schematic cross-sectional view of a backlight unit for a liquid crystal display according to a second embodiment of the present invention.

5 and 6, the liquid crystal display according to the second embodiment includes a liquid crystal panel 210, a backlight unit 220, and a main frame 240. This is a mobile liquid crystal display device, in which the top frame covering the front edge of the liquid crystal panel 210 and the bottom frame covering the rear surface of the backlight unit 220 are omitted. However, it is obvious that the top frame and the bottom frame may be included.

The liquid crystal panel 210 plays a key role in image expression and includes first and second substrates 212 and 214 bonded to each other with a liquid crystal layer interposed therebetween.

Although not shown, a plurality of gate lines and data lines intersect each other to define a pixel on an inner surface of the first substrate 212, commonly referred to as a lower substrate or an array substrate, and a thin film transistor is formed at each intersection point. TFTs are provided and connected one-to-one with the transparent pixel electrodes formed in each pixel.

In addition, a color filter of red (R), green (G), and blue (B) color corresponding to each pixel may be formed on the inner surface of the second substrate 214 called an upper substrate or a color filter substrate. A black matrix is provided to cover non-display elements such as gate lines, data lines, and thin film transistors. In addition, a transparent common electrode covering them is provided.

When a signal is applied to the gate line and the thin film transistor is turned on, a signal is applied to the pixel electrode through the data line. Accordingly, an electric field is formed between the pixel electrode and the common electrode, and the liquid crystal molecules of the liquid crystal layer are driven by the electric field.

Along the at least one edge of the liquid crystal panel 210, the gate and the data printed circuit board 217 are connected to each other via a connection member 216 such as a flexible circuit board, and the main frame 240 is closely contacted in the modularization process.

In addition, an alignment layer (not shown) for determining an initial molecular alignment direction of the liquid crystal is interposed between the first and second substrates 212 and 214 and the liquid crystal layer of the liquid crystal panel 210, and filled therebetween. Seal patterns (not shown) are formed along edges of the first and second substrates 212 and 214 to prevent leakage of the liquid crystal layer. First and second polarizers (not shown) are attached to outer surfaces of each of the first and second substrates 212 and 214.

The backlight unit 220 is positioned below the liquid crystal panel 110 to supply light. As described above, the difference in transmittance generated by driving the liquid crystal molecules of the liquid crystal layer is expressed to the outside. The image will be implemented.

The backlight unit 220 includes a light guide plate 222, a reflective plate 224, an optical sheet 226, a first LED assembly 232, and a second LED assembly 234.

The light guide plate 222 is disposed under the liquid crystal panel 210, and the reflector plate 224 is positioned on the rear surface of the light guide plate 222. In addition, the optical sheet 226 is positioned above the light guide plate 222, that is, between the liquid crystal panel 210 and the optical sheet 226.

The first and second LED assemblies 232 and 234 are positioned at one side of the light guide plate 222 to supply light toward the light guide plate 222.

Light emitted from the first and second LED assemblies 232 and 234 is incident on the light guide plate 222 and then spread evenly inside the light guide plate 222 by total reflection and is uniform through the optical sheet 226. The light source is provided to the liquid crystal panel 210.

The light guide plate 222 may include a pattern (not shown) of a specific shape on the rear surface to supply a uniform surface light source. For example, the pattern may be an elliptical shape, a polygon shape, or a hologram pattern.

The reflector 224 reflects light from the rear surface of the light guide plate 222 to increase light efficiency. The optical sheet 226 includes at least one diffusion sheet and at least one light collecting sheet.

The first LED assembly 232 includes a first LED printed circuit board 232a and a first LED 232b arranged on the first LED printed circuit board 232a and the second LED assembly 234. Includes a second LED printed circuit board 234a and a second LED 234b arranged on the second LED printed circuit board 234a.

The first LED 232b has a first color coordinate, and the second LED 234b has a second color coordinate different from the first color coordinate. That is, all of the first LEDs 232b mounted on the first LED printed circuit board 232a have the same color coordinates, and the second LEDs 234b mounted on the second LED printed circuit board 234a All have the same color coordinates and have different color coordinates than the first LED 232b.

In addition, the first LED 232b is arranged in an odd-numbered column on the first LED printed circuit board 232a, and the second LED 234b is arranged in an even-numbered column on the second LED printed circuit board 234a. do.

The main frame 240 surrounds the side surfaces of the liquid crystal panel 210 and the backlight unit 220 and has an opening 242 for the backlight unit 220. That is, the light guide plate 222 is surrounded by the main frame 240 and is positioned in the opening 242.

The main frame 240 has a plurality of protrusions 244 formed on one side to form a plurality of first and second grooves 246 and 248 alternately positioned.

The first LED 232b having a first color coordinate is placed in the first groove 246, and the second LED 234b having a second color coordinate is placed in the second groove 248. Alternatively, the first and second LEDs 232b and 234b may be alternately disposed without the first and second grooves 246 and 248.

That is, as long as the first and second LEDs 232b and 234b are alternately disposed on one side of the light guide plate 222, the shape of the main frame 240 is not limited.

The first LED 232b is inserted into the first groove 246 of the main frame from the lower side in a state in which the first LED 232b is mounted on the first LED printed circuit board 232a, and the second LED 234b is formed in the first LED 232b. 2 is inserted into the second groove 248 of the main frame from the upper side in the state mounted on the 2 LED printed circuit board 234a.

That is, the first LED printed circuit board 232a is positioned below the main frame 240 and the first LED 232b protrudes upward from the first LED printed circuit board 232a. Inserted into the first groove 246 of the 240, the second LED printed circuit board 234a is located above the main frame 240 and the second LED 234b is the second LED printed circuit board It is inserted into the second groove 248 of the main frame 240 to protrude downward from the (234a). Thus, the first and second LEDs 232b and 234b are alternately arranged on one side of the light guide plate 222 on the same plane. At this time, the LED mounted on any one of the LED printed circuit board may be in contact with the appropriate LED printed circuit board. That is, the distance between the first surface of the first LED printed circuit board 232a on which the first LED 232b is mounted and the second surface of the second LED printed circuit board 234a on which the second LED 234b is mounted The same as the thickness of each of the first and second LEDs 232b and 234b, so that when the first and second LEDs 232b and 234b are inserted into the first and second grooves 246 and 248, the first LEDs 232b are used. Is in contact with the second surface of the second LED printed circuit board 234a and the second LED 234b is in contact with the first surface of the first LED printed circuit board 232a.

When the surface attached to the LED printed circuit board is the bottom of the LED, the LED is a side-view type that emits light to the side and a top-view type that emits light to the top. Can be distinguished.

In this case, in the second embodiment, each of the first and second LEDs 232b and 234b is a side-view type. That is, since the first and second printed circuit boards 232a and 234a are positioned below and above the main frame 240, the upper surfaces of the first and second LEDs 232b and 234b respectively correspond to the second and second printed circuit boards. The first printed circuit boards 234a and 232a are faced. Thus, if each of the first and second LEDs 232b and 234b is a top-view type, light is emitted toward the second and first printed circuit boards 234a and 232a so that light is not supplied to the light guide plate 222. Or its efficiency is low.

Light emitted from the first and second LEDs 232b and 234b, which is a side-view type, is supplied to the light guide plate 222, and the first and second LEDs 232b, 234b), light of uniform brightness and color is supplied. In addition, since LEDs having the same color coordinates are mounted on the same LED printed circuit board, there is no problem that LEDs of the same color coordinates are disposed adjacently as in the first embodiment.

For example, when the first LEDs 232b are arranged adjacent to the first LED printed circuit board 232a, a problem of deterioration in luminance and color uniformity occurs, which is easily identified by visual recognition. You can do it. Therefore, failure of the LED assembly can be minimized and a separate inspection process for determining the failure can be minimized.

After the light guide plate 222 and the first and second LED assemblies 232 and 234 are installed, the reflector plate 224 is attached to the bottom of the light guide plate 222.

After the optical sheet 226 is seated on the light guide plate 222, a light shielding tape 228 is attached to cover the edge of the main frame 240 and the edge of the optical sheet 226. The light shielding tape 228 prevents light leakage directly from the first and second LED assemblies 232 and 234. At this time, the protruding portion having the same thickness as the LED printed circuit board is formed at the edge of the main frame to form a flat surface between the LED printed circuit board and the main frame. Accordingly, the light blocking tape 228 is stably attached to the protrusions (edges) of the main frame 240 and the LED printed circuit board.

In the backlight unit of the present invention, the first LED having the first color coordinates and the second LED having the second color coordinates are alternately arranged to supply light having uniform brightness and color by the additive mixing principle.

Therefore, an image having a uniform brightness and color including the backlight unit is realized.

In addition, by providing an LED backlight unit having a dual structure that mounts LEDs having different color coordinates on different LED printed circuit boards and overlaps them up and down, the probability of failure that may occur in the process of mounting the LED on the LED printed circuit board This is minimized.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art various modifications and changes to the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

210: liquid crystal panel 220: backlight unit
222: LGP 224: Reflector
226: Optical sheet 232, 234: LED assembly
232a, 234a: LED printed circuit board 232b, 234b: LED
240: main frame 242: opening
244: protrusion 246, 248: groove

Claims (13)

delete delete delete delete delete A liquid crystal panel;
A first light guide plate positioned below the liquid crystal panel and positioned on one side of the light guide plate and mounted on a first LED printed circuit board and the first LED printed circuit board and having a first color coordinate; An LED assembly, a second LED printed circuit board disposed on the side of the light guide plate and facing the first LED printed circuit board, and mounted on the second LED printed circuit board and having a second color coordinate different from the first color coordinate; A backlight unit including a second LED assembly including a second LED; a main frame surrounding a side of the backlight unit;
The first LED and the second LED are alternately arranged;
A plurality of protrusions are formed on one side of the main frame to form first and second grooves alternately positioned, wherein the first LED is inserted into the first groove and the second LED is inserted into the second groove. Liquid crystal display device characterized in that.

delete delete The method of claim 6,
Wherein the first LED is arranged in an odd column of the first LED printed circuit board, and the second LED is arranged in an even column of the second printed circuit board.
The method of claim 6,
And the backlight unit includes a reflecting plate disposed on a rear surface of the light guide plate and an optical sheet disposed between the light guide plate and the liquid crystal panel.
The method of claim 6,
And each of the first and second LEDs is a side-view type in which light is emitted to the side. The method of claim 6,
One upper edge of the main frame has a protrusion having the same thickness as that of the second LED printed circuit board, and one upper edge of the main frame and the second LED printed circuit board form a flat surface.
And a light blocking tape attached to the protrusion of the main frame and the second LED printed circuit board.
The method of claim 6,
The first LED assembly is mounted on a first side of the first LED printed circuit board, and the second LED assembly is mounted on a second side of the second LED printed circuit board to face the first LED printed circuit board. ,
The distance between the first side of the first LED printed circuit board and the second side of the second LED printed circuit board is equal to the thickness of each of the first LED and the first LED so that the first LED prints the second LED. And a second LED in contact with a second surface of the circuit board and in contact with a first surface of the first LED printed circuit board.
KR1020120093643A 2012-08-27 2012-08-27 Backlight unit and liquid crystal display device including the same KR102007830B1 (en)

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Application Number Priority Date Filing Date Title
KR1020120093643A KR102007830B1 (en) 2012-08-27 2012-08-27 Backlight unit and liquid crystal display device including the same

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Application Number Priority Date Filing Date Title
KR1020120093643A KR102007830B1 (en) 2012-08-27 2012-08-27 Backlight unit and liquid crystal display device including the same

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KR20140027712A KR20140027712A (en) 2014-03-07
KR102007830B1 true KR102007830B1 (en) 2019-08-06

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004286777A (en) * 2003-03-19 2004-10-14 Hitachi Displays Ltd Liquid crystal display device
JP2007079093A (en) * 2005-09-14 2007-03-29 Nec Corp Light source device, display device, terminal device, light source unit, and driving method for light source device
JP2008015306A (en) * 2006-07-07 2008-01-24 Epson Imaging Devices Corp Liquid crystal display module

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101635210B1 (en) * 2009-11-16 2016-07-01 엘지디스플레이 주식회사 Light emitting diode assembly and liquid crystal display using the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004286777A (en) * 2003-03-19 2004-10-14 Hitachi Displays Ltd Liquid crystal display device
JP2007079093A (en) * 2005-09-14 2007-03-29 Nec Corp Light source device, display device, terminal device, light source unit, and driving method for light source device
JP2008015306A (en) * 2006-07-07 2008-01-24 Epson Imaging Devices Corp Liquid crystal display module

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