KR20130011499A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
KR20130011499A
KR20130011499A KR1020110072681A KR20110072681A KR20130011499A KR 20130011499 A KR20130011499 A KR 20130011499A KR 1020110072681 A KR1020110072681 A KR 1020110072681A KR 20110072681 A KR20110072681 A KR 20110072681A KR 20130011499 A KR20130011499 A KR 20130011499A
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KR
South Korea
Prior art keywords
liquid crystal
diffusion plate
fixing pin
protrusion
support side
Prior art date
Application number
KR1020110072681A
Other languages
Korean (ko)
Inventor
최정욱
손승우
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020110072681A priority Critical patent/KR20130011499A/en
Publication of KR20130011499A publication Critical patent/KR20130011499A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/0075—Fastening of light sources or lamp holders of tubular light sources, e.g. ring-shaped fluorescent light sources
    • F21V19/008—Fastening of light sources or lamp holders of tubular light sources, e.g. ring-shaped fluorescent light sources of straight tubular light sources, e.g. straight fluorescent tubes, soffit lamps
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0093—Means for protecting the light guide
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)

Abstract

PURPOSE: A liquid crystal display is provided to reduce the movement of a diffusing plate and to prevent the branching phenomenon of a polarizing plate. CONSTITUTION: A light source is formed in the rear side of a liquid crystal panel(10). A diffusing plate(15) is formed between the liquid crystal panel and the light source. The diffusing plate diffuses light. Support sides(16a,16b) support the diffusing plate. A protrusion part(17) is formed in the side of the diffusing plate. A fixing pin(18) is formed in the upper side of the support side. The fixing pin prevents the movement of the diffusing plate.

Description

[0001] Liquid crystal display device [0002]

The embodiment relates to a liquid crystal display device.

As the information society develops, the demand for display devices for displaying images is increasing in various forms. A flat panel display device including a thin liquid crystal display (LCD), a plasma display (PDP) or an organic electroluminescent device (OLED) which is thinner and lighter than a conventional cathode ray tube display (CRT) has been actively researched and commercialized . Of these, liquid crystal display devices are widely used today because of their advantages of miniaturization, light weight, thinness, and low power driving.

Unlike the CRT, the liquid crystal display is not a display device that emits light by itself, and thus, a backlight unit including a separate light source is provided on the rear surface of the liquid crystal display panel to provide light for visually representing an image.

The backlight unit is a light source that emits light and uses a plasma light source such as a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent tube (HCFL), an external electrode fluorescent tube (EEFL), and an external & internal electrode fluorescent tube (EIFL). Or a light emitting diode (LED) is used.

The backlight unit may be classified into a direct type method of arranging light sources under the liquid crystal panel and an edge type method of arranging light sources on the side of the light guide plate according to the installation type of the light source.

1 is a cross-sectional view of a liquid crystal display including a conventional edge type backlight unit.

Referring to FIG. 1, a liquid crystal display includes a rectangular box-shaped metal frame 190 having an upper surface, a printed circuit board 151 and an printed circuit board 151 provided on one inner surface of the metal frame 190. A plurality of light emitting diode package 153 is mounted on the.

A light guide plate for converting the point light generated from the light emitting diode package 153 into surface light is provided on the metal frame 190. The lower portion of the light guide plate 140 is provided with a reflector plate 170 for reflecting light traveling toward the lower portion of the light guide plate 140 toward the liquid crystal display panel 110. Optical sheets 130 are provided on the light guide plate 140 to diffuse and collect light emitted from the light guide plate 140.

The liquid crystal display panel 110 displaying an image is formed on the optical sheets 130. The liquid crystal display panel 110 includes a color filter substrate 111, a thin film transistor substrate 113, and a liquid crystal layer interposed between the two substrates, which are bonded to face each other to maintain a uniform cell gap. .

An air gap 155 exists between the light emitting diode 153 and the light guide plate 140 to prepare for thermal expansion of the light guide plate 140.

In the case of the liquid crystal display including the edge type backlight unit, the optical sheets 130 may be formed of a sheet material due to the presence of the light guide plate.

2 is a cross-sectional view of a liquid crystal display device including the conventional direct type backlight unit.

Referring to FIG. 2, in the liquid crystal display device, a mold frame 122 is formed in a metal frame 120 having an upper surface, and the liquid crystal panel 125, the diffusion plate 126, and the optical body are in contact with the mold frame 122. The sheet 127 and the lamp 124 may be formed.

The mold frame 122 includes a first support portion 121 and a second support portion 123 protruding from the mold frame 122. The first support part 121 serves to support the diffusion plate 126 and the optical sheet 127. The optical sheet 127 is formed on the diffusion plate 126.

The second support part 123 supports the liquid crystal panel 125. The liquid crystal panel 125 displays an image and includes a color filter substrate 128 and a thin film transistor substrate 129. The liquid crystal panel 125 may include a polarizer (not shown) on an outer side surface thereof.

The lamp 124 is fixed to the first support part 121 of the mold frame 122.

The reflector plate 131 is formed on the metal frame 120 to reflect the light from the lamp 124 to the front side.

In the case of the direct type backlight unit, unlike the edge type backlight unit, since there is no light guide plate, the lamp pattern may be reflected on the display surface of the liquid crystal panel when the lamp is driven. Therefore, a gap of the first air gap 155a is formed between the upper surface of the lamp 124 and the diffusion plate 126. Although not shown, the LED package may be reflected when the light source is configured as an LED package, thereby forming the first air gap 155a.

A second air gap 155b is formed between the lamp 124 and the reflector 131. The second air gap 155b serves to prevent breakage of the lamp 124 by contact of the lamp 124 and the reflector 131 due to external impact.

The first air gap 155a is an essential element for improving the image quality of the direct type backlight unit. Due to the first air gap 155a, the diffusion plate 126 is in a situation in which the central region does not come into contact with any medium. Therefore, like the edge type backlight unit, only an optical sheet made of a sheet material may not be formed, and it should be formed together with the plate diffusion plate 126.

When the liquid crystal display is vertically mounted, the bottom surface of the diffusion plate 126 is in contact with the mold frame 122, but the top surface of the diffusion plate 126 is not in contact with the mold frame 122. Accordingly, the diffusion plate 126 that is not in contact with the diffusion plate 126 may be collided with the liquid crystal panel 125 by the flow thereafter, and the polarizing plate formed on the outer side surface of the liquid crystal panel 125 ( There is a problem that can be damaged in contact with the polarizing plate in contact with the polarizer.

This problem is more serious as the distance between the diffusion plate 126 and the liquid crystal panel 125 is reduced due to the recent thinning of the liquid crystal display device.

The embodiment prevents the polarization of the polarizing plate.

The embodiment prevents contact damage of the liquid crystal panel.

According to an embodiment, a liquid crystal display includes: a liquid crystal panel displaying an image; A light source formed on a rear surface of the liquid crystal panel to irradiate light; A diffusion plate formed between the liquid crystal panel and the light source to scatter light; A support side supporting the diffusion plate; Protrusions formed on the side of the diffusion plate; A fixing pin formed on an upper surface of the support side to correspond to the protrusion to prevent flow of the diffusion plate; And a bottom cover coupled to the support side and supporting the liquid crystal panel and the light source.

The embodiment forms a protrusion on the diffusion plate and a fixing pin on the support side to reduce the flow of the diffusion plate to prevent the polarization of the polarizing plate.

The embodiment forms a protrusion on the diffusion plate and a fixing pin on the support side to reduce the flow of the diffusion plate to prevent contact damage of the liquid crystal panel.

1 is a cross-sectional view of a liquid crystal display including a conventional edge type backlight unit.
2 is a cross-sectional view of a liquid crystal display device including the conventional direct type backlight unit.
3 is an exploded perspective view of the liquid crystal display according to the first embodiment.
4 is an assembled cross-sectional view of the liquid crystal display according to the first embodiment.
5 is an assembly plan view of a diffusion plate and a support side part of the liquid crystal display according to the first embodiment.
6 is an assembly plan view of a diffusion plate and a support side part of a liquid crystal display according to a second embodiment.
FIG. 7 is an assembly plan view of a diffuser plate and a support side part of a liquid crystal display according to a third exemplary embodiment.

3 is an exploded perspective view of the liquid crystal display according to the first embodiment.

Referring to FIG. 1, the liquid crystal display according to the first exemplary embodiment includes an upper and lower substrates facing each other and having an electrode for generating an electric field, and a liquid crystal layer interposed between the upper and lower substrates. A gate line for supplying a scan signal, a data line for supplying a data signal, and a thin film transistor for displacement of the liquid crystal layer are formed on the lower substrate. The upper and lower substrates may form the liquid crystal panel 10. Polarizing plates (not shown) may be formed on both side surfaces of the liquid crystal panel 10. The polarizing plate (not shown) is configured to transmit only components polarized in a specific direction of incident light. The data line of the liquid crystal panel 10 may be electrically connected to the first printed circuit board 11a. The gate line of the liquid crystal panel 10 may be electrically connected to the second printed circuit board 11b. A data driver may be mounted on the first printed circuit board 11a, and a gate driver may be mounted on the second printed circuit board 11b. The data signal may be supplied from the first printed circuit board 11a through a data line, and the scan signal may be supplied from the second printed circuit board 11b through a gate line.

A backlight unit 20 for supplying light to the liquid crystal panel 10 may be disposed on the rear surface of the liquid crystal panel 10. The backlight unit 20 may include an optical sheet 14, a diffusion plate 15, a support side 16, and a plurality of lamps 22.

The liquid crystal display includes a rectangular frame-shaped guide panel 12 that surrounds the liquid crystal panel 10 and the backlight unit 20, and a bottom cover 26 that supports side and rear surfaces of the backlight unit 20. In addition, the upper edge of the liquid crystal panel 10 is surrounded by a square frame top case 40 coupled to the guide panel 12 and is modularized by a plurality of coupling members (not shown) for coupling them.

The plurality of lamps 22 are arranged in parallel at regular intervals to irradiate light to the rear surface of the liquid crystal panel 10. The lamp 22 may be formed of any one of a Cold Cathode Fluorecent Lamp (CCFL), a Hot Cathode Florecent Lamp (HCFL), and an External Electrode Fluorecent Lamp (EEFL). One side of the plurality of lamps 22 may be electrically connected to the first balanced printed circuit board 124a, and the other side of the plurality of lamps 22 may be electrically connected to the second balanced printed circuit board 124b. A plurality of lamp sockets 34 may be formed on the first and second balance printed circuit boards 124a and 124b along the length direction. Both sides of the plurality of lamps 22 may be inserted into and fixed to the lamp socket 34.

The support side 16 is formed on the first and second balance printed circuit boards 124a and 124b. The support side 16 is coupled to both side ends of the bottom cover 26 supporting the rear and side surfaces of the backlight unit 20. Inside the bottom cover 26, a reflecting plate 32, which serves to reflect light emitted from the plurality of lamps 22 and provide the light to the diffuser plate 15 and the optical sheet 14, is positioned.

The support side 16 may be configured in a trapezoidal shape in which one side is formed in a slanted surface. The diffusion plate 15 and the optical sheet 14 may be sequentially stacked on the support side 16. The diffusion plate 15 may be formed of poly methylmethacrylate (PMMA) or polycarbonate (PC). The diffusion plate 15 may serve to scatter light.

A plurality of fixing pins 18 may be formed on the support side 16. The fixing pin 18 may protrude from the support side 16. The fixing pin 18 may be formed of the same material as the support side 16. The fixing pin 18 may extend from the support side 16. The fixing pin 18 may be formed of a material different from that of the support side 16. The fixing pin 18 may be formed of a metal material. The fixing pin 18 may be coupled to the support side 16 in a wedge shape. The fixing pin 18 may be formed to penetrate the support side 16 in a wedge shape. The fixing pin 18 may be formed at a position corresponding to the two support sides 16 disposed at both ends of the bottom cover 26. The fixing pin 18 may be formed in an even number. A total of four fixing pins 18 may be formed on each of the support pins 16. Each fixing pin 18 may be formed at regular intervals.

The diffusion plate 14 may include a protrusion 17 protruding outward of the diffusion plate 14. The protrusion 17 may extend from the diffusion plate 14. The protrusion 17 may be formed of the same material as the diffusion plate 14. The protrusion 17 may be formed in the same number as the fixing pin 18. The protrusion 17 may be formed to correspond to the fixing pin 18.

A printed circuit board including an inverter (not shown) for supplying lamp driving voltages to the plurality of lamps 22 may be disposed on the bottom of the bottom cover 26.

The first and second balance printed circuit boards 24a and 24b may be disposed in both side surfaces of the bottom cover 26. An area first insulating layer 28 corresponding to the first balance printed circuit board 24a may be formed. The second insulating layer 30 may be formed in an area corresponding to the second balance printed circuit board 24b. In other words, the first insulating film 28 is formed between the first balanced printed circuit board 24a and the reflecting plate 32, and the second insulating film 30 is formed of the second balanced printed circuit board 24b and the second insulating film 30. It may be formed between the reflecting plate (32). In other words, the first and second insulating layers 28 and 30 may be formed in both side surfaces of the bottom cover 26. The first and second insulating layers 28 and 30 may be formed of poly ethylene terephthalate (PET) or poly carbonate (PC). The first and second insulating layers 28 and 30 may prevent electrical connection between the reflective plate 32 and the first and second balance printed circuit boards 24a and 24b.

4 is an assembled cross-sectional view of the liquid crystal display according to the first embodiment.

5 is an assembly plan view of a diffusion plate and a support side part of the liquid crystal display according to the first embodiment.

4 and 5, the liquid crystal display according to the first exemplary embodiment includes a top case 40 having a rectangular frame shape on an upper surface thereof, a guide panel 12 coupled to an inside of the top case 40, and the guide panel. (12) It may include a support side 16 of the trapezoidal shape of the bottom is coupled to the bottom and the bottom cover 26 is coupled to the bottom of the support side (16). The support side 16 may be formed in two on both sides of the bottom cover 26. In other words, the support side 16 may include a first support side 16a and a second support side 16b.

The top case 40 and the guide panel 12 generate a constant clearance, and the liquid crystal panel 10 is coupled to the clearance. The liquid crystal panel 10 may include a color filter substrate 1 and a thin film transistor substrate 3. A polarizing plate (not shown) may be formed on an outer side surface of the liquid crystal panel 10 to polarize incident light in a specific direction.

A gap is formed between the guide panel 12 and the support side 16, and the diffusion plate 15 and the optical sheet 14 are coupled to the gap. The diffusion plate 15 and the optical sheet 14 may have a stacked structure sequentially.

Protrusions 17 protruding outward from the diffusion plate 15 may be formed on both sides of the diffusion plate 15. The protrusion 17 may be formed symmetrically. For example, four protrusions 17 may be formed on each side of the diffusion plate 15. In other words, the protrusion 17 may include first to fourth protrusions 17a, 17b, 17c, and 17d. The protrusion 17 may protrude from 40 mm to 50 mm from the diffusion plate 15. The protrusions 17 may be formed at regular intervals, respectively.

The fixing pin 18 may be formed on the support side 16. The fixing pin 18 may have a height in the direction of the liquid crystal panel 10. The height of the fixing pin 18 is smaller than the thickness of the diffusion plate 15. This is because if the height of the fixing pin 18 is greater than the thickness of the diffusion plate 15, the optical sheet 14 may be damaged by contact with the optical sheet 14. The fixing pin 18 may be formed to correspond to the protrusion 17. The fixing pin 18 may be formed symmetrically. For example, four fixing pins 18 may be formed on each of the two support sides 16. In other words, the fixing pin 18 may include first to fourth fixing pins 18a, 18b, 18c, and 18d. In other words, the first and second fixing pins 18a and 18b may be formed on the first support side 16a and the third and fourth fixing pins 18c and 18d may be formed on the second support side 16b. Can be formed.

An opening region may be formed on the hypotenuse of the support side 16. Lamp 22 may be coupled to the opening area. The first insulating layer 28 and the first balance printed circuit board 24a may be sequentially formed in the trapezoidal region formed by the bottom cover 26 and the first support side 16a. The first balance printed circuit board 24a may be electrically connected to the lamp 22 through the lamp socket 34. The second insulating layer 28 and the second balance printed circuit board 24b may be sequentially formed in the trapezoidal region formed by the bottom cover 26 and the second support side 16b. The second balance printed circuit board 24b may be electrically connected to the lamp 22 through a lamp socket 34. The lamp 22 is supplied with a driving voltage generated from an inverter (not shown) through the first and second balance printed circuit boards 24a and 24b.

The reflective plate 32 may be formed on the bottom cover 26.

Between the reflecting plate 32 and the lamp 22, there should be a predetermined size of gap to prevent contact breakage of the reflecting plate 32 and the lamp 22 by an external impact.

There should be a constant separation between the lamp 22 and the diffuser plate 15. In the case of a direct type liquid crystal display, when the distance between the lamp 22 and the diffusion plate 15 is small, the lamp pattern may be reflected on the screen.

Unlike the edge type liquid crystal display device by the separation between the lamp 22 and the diffusion plate 15, the optical sheet should be further provided with a diffusion plate that can support it. The diffusion plate 15 should be formed of a material having a higher hardness than the sheet material. The diffusion plate 15 may be formed of poly methylmethacrylate (PMMA) or polycarbonate (PC) material to support the optical sheet 14. As the diffusion plate 15 is formed of a material having a high hardness, processing is difficult. Therefore, a simple fixing part is required as compared with the invention for fixing the conventional optical sheet.

Referring to the positional relationship between the protrusions and the fixing pins based on the plan view of the diffusion plate and the support side of FIG. 5, for example, four protrusions 17 may be formed on both sides of the diffusion plate 15. In other words, first and second protrusions 17a and 17b are formed at one side of the diffusion plate 15, and third and fourth protrusions 17c and 17d are formed at the other side of the diffusion plate 15. Can be. The protrusion 17 may have a rectangular shape in which 30 to 40 mm is protruded based on both sides of the diffusion plate 15.

For example, the support side 16 may include a first support side 16a and a second support side 16b. Two fixing pins 18 may be formed on the first and second support sides 16a, respectively. In other words, the first and second fixing pins 18a and 18b may be formed on the first support side 16a, and the third and fourth fixing pins 18c and 18d may be formed on the second support side 16b. Can be. The fixing pin 18 may be formed in a circular shape having a diameter. The fixing pin 18 may have a diameter smaller than the protruding length of the protrusion 17. For example, the fixing pin 17 must be formed in a circular shape having a diameter of at least 3 mm to support the protrusion 17. In other words, the diameter of the fixing pin 17 may be formed in a circular shape having a diameter of 3mm to 40mm. The fixing pin 17 should be formed with a height in the optical sheet 14 direction. The height of the fixing pin 17 should be smaller than the thickness of the diffusion plate 15. This is because when the height of the fixing pin 17 is larger than the diffusion plate 15, damage due to friction with the optical sheet 14 stacked on the diffusion plate 15 may occur.

The first fixing pin 18a may be formed under the first protrusion 17a. The second fixing pin 18b may be formed on the second protrusion 17b. The third fixing pin 18c may be formed below the third protrusion 17c. The fourth fixing pin 18d may be formed on the fourth protrusion 17d.

The fixing pin 18 and the protrusion 17 have a predetermined distance to prevent breakage due to misalignment. The first protrusion 17a and the first fixing pin 18a are spaced apart by a first interval d1, and the second protrusion 17b and the second fixing pin 18b are spaced apart from each other through a second interval d2. Spaced apart). The third protrusion 17c and the first fixing pin 18c are spaced apart by the first interval d1, and the fourth protrusion 17c and the fourth fixing pin 18c are spaced apart from the second interval d2. Spaced apart). The fixing pin 18 is formed such that the sum of the first interval d1 and the second interval d2 is 0.5 mm.

Since the liquid crystal display is mounted in the vertical direction, the diffusion plate 15 may move in the first direction 50 or the second direction 52. When the diffusion plate 15 moves in the first direction 50, the second protrusion 17b is in contact with the second fixing pin 18b, and at the same time, the fourth protrusion 17d is connected to the fourth fixing pin ( 18d). In other words, the second interval d2 is eliminated and the first interval d1 is 0.5 mm, which is the maximum. When the diffusion plate 15 moves in the second direction 52, the first protrusion 17a is in contact with the first fixing pin 18a, and at the same time, the third protrusion 17c is connected to the third fixing pin ( 18c). In other words, the first interval d1 is eliminated and the second interval d2 is 0.5 mm, which is the maximum.

Even if the flow of the diffusion plate 15 is reduced by the protrusion 17 and the fixing pin 18, and the diffusion plate 15 moves in the first direction 50 or the second direction 52. The protrusion 17 comes into contact with the fixing pin 18 and the support side 16 including the fixing pin 18 supports the diffuser plate 15 including the protrusion 17 so as to support the diffusion plate 15. Deflection of (15) does not occur. Therefore, damage to the polarizing plate and the liquid crystal panel due to the flow of the diffusion plate 15 can be prevented. Alternatively, the polarization of the polarizing plate may be prevented.

6 is an assembly plan view of a diffusion plate and a support side part of a liquid crystal display according to a second embodiment.

The liquid crystal display according to the second embodiment has a different positional relationship between the protruding portion and the fixing pin and the other configuration is the same as that of the liquid crystal display according to the first embodiment. Therefore, the same reference numerals are assigned to parts common to those in the first embodiment, and detailed description thereof will be omitted.

For example, four protrusions 17 may be formed on both sides of the diffusion plate 15. In other words, first and second protrusions 17a and 17b are formed at one side of the diffusion plate 15, and third and fourth protrusions 17c and 17d are formed at the other side of the diffusion plate 15. Can be.

For example, the support side 16 may include a first support side 16a and a second support side 16b. Two fixing pins 18 may be formed on the first and second support sides 16a, respectively. In other words, the first and second fixing pins 18a and 18b may be formed on the first support side 16a, and the third and fourth fixing pins 18c and 18d may be formed on the second support side 16b. Can be.

The first fixing pin 18a may be formed on the first protrusion 17a. The second fixing pin 18b may be formed under the second protrusion 17b. The third fixing pin 18c may be formed on the third protrusion 17c. The fourth fixing pin 18d may be formed below the fourth protrusion 17d.

Since the liquid crystal display is mounted in the vertical direction, the diffusion plate 15 may move in the first direction 50 or the second direction 52. When the diffusion plate 15 moves in the second direction 52, the second protrusion 17b is in contact with the second fixing pin 18b, and at the same time, the fourth protrusion 17d is connected to the fourth fixing pin ( 18d). In other words, the second interval d2 is eliminated and the first interval d1 is 0.5 mm, which is the maximum. When the diffusion plate 15 moves in the first direction 50, the first protrusion 17a is in contact with the first fixing pin 18a, and at the same time, the third protrusion 17c is connected to the third fixing pin ( 18c). In other words, the first interval d1 is eliminated and the second interval d2 is 0.5 mm, which is the maximum.

FIG. 7 is an assembly plan view of a diffuser plate and a support side part of a liquid crystal display according to a third exemplary embodiment.

The liquid crystal display according to the third exemplary embodiment has a different shape and a different configuration from the fixing pins compared with the liquid crystal display according to the first exemplary embodiment. Therefore, the same reference numerals are assigned to parts common to those in the first embodiment, and detailed description thereof will be omitted.

The support side 16 may include a first support side 16a and a second support side 16b. Two fixing pins 18 may be formed on the first and second support sides 16a, respectively. In other words, the first and second fixing pins 18a and 18b may be formed on the first support side 16a, and the third and fourth fixing pins 18c and 18d may be formed on the second support side 16b. Can be.

The fixing pin 18 may be formed in a square shape. The width of the fixing pin 18 may be smaller than the length of the protrusion 17. By forming the fixing pin 18 in a rectangular shape, the contact area between the fixing pin 18 and the protrusion 17 is increased, so that the load per unit area applied to the fixing pin 18 and the protrusion 17 is increased. It has a decreasing effect.

The fixing pin 18 may be formed in a polygonal shape rather than a quadrangle.

The first to third embodiments have described a liquid crystal display device having a backlight unit as a lamp, but the same applies to the case where the backlight unit is an LED package. When the backlight unit is an LED package, the configuration of the remaining diffusion plates is the same except that the light source is mounted on the reflecting plate.

10, 110, 125: liquid crystal panel 11a: first printed circuit board
11b: second printed circuit board 12: guide panel
14,127,130: optical sheet 15,126: diffuser plate
16: support side 17: protrusion
18: fixed pin 20: backlight unit
22,124: lamp 24a: first balanced printed circuit board
24b: second balance printed circuit board 26: bottom cover
28: first insulating film 30: second insulating film
32,170: Reflector 34: Lampholder
111,128: color filter substrate 113,129: thin film transistor substrate
120, 190: metal frame 121: first support portion
122: mold frame 123: second support portion
140: light guide plate 151: printed circuit board
153: light emitting diode package 155: air gap

Claims (14)

A liquid crystal panel for displaying an image;
A light source formed on a rear surface of the liquid crystal panel to irradiate light;
A diffusion plate formed between the liquid crystal panel and the light source to scatter light;
A support side supporting the diffusion plate;
Protrusions formed on the side of the diffusion plate;
A fixing pin formed on an upper surface of the support side to correspond to the protrusion to prevent flow of the diffusion plate; And
And a bottom cover coupled to the support side and supporting the liquid crystal panel and the light source. The method of claim 1,
And the protrusion is formed to extend on the diffusion plate. The method of claim 1,
The fixing pin is a wedge-shaped liquid crystal display device coupled to the support side. The method of claim 1,
The fixing pin has a circular shape. 5. The method of claim 4,
The fixing pin has a diameter smaller than the protrusion length of the protrusion. The method of claim 1,
The fixing pin has a rectangular shape. The method according to claim 6,
And a horizontal length of the fixing pin is smaller than a protrusion length of the protrusion. The method of claim 1,
The fixing pin is formed to be spaced apart from the protrusion. The method of claim 1,
The height of the fixing pin is smaller than the thickness of the diffusion plate. The method of claim 1,
The diffusion plate is formed of a poly methylmethacrylate (PMMA) or a polycarbonate (PC) material. The method of claim 1,
And an optical sheet formed on the diffusion plate to scatter light. The method of claim 1,
A first support side coupled to one side of the bottom cover and having first and second fixing pins formed thereon;
A second support side coupled to the other side of the bottom cover and having third and fourth fixing pins formed thereon;
First and second protrusions formed on one side of the diffusion plate; And
And third and fourth protrusions formed on the other side of the diffusion plate. The method of claim 12,
The first and second fixing pins are formed inside the first and second protrusions,
And third and fourth fixing pins formed inside the third and fourth protrusions. The method of claim 12,
The first and second fixing pins are formed on the outer side of the first and second protrusions,
And third and fourth fixing pins formed outside the third and fourth protrusions.


KR1020110072681A 2011-07-21 2011-07-21 Liquid crystal display device KR20130011499A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014123366A1 (en) * 2013-02-08 2014-08-14 Samsung Electronics Co., Ltd. Cross-reference to related application(s)
KR101457161B1 (en) * 2013-02-08 2014-11-13 삼성전자 주식회사 Fixture of diffusing plate and display apparatus having the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014123366A1 (en) * 2013-02-08 2014-08-14 Samsung Electronics Co., Ltd. Cross-reference to related application(s)
KR101457161B1 (en) * 2013-02-08 2014-11-13 삼성전자 주식회사 Fixture of diffusing plate and display apparatus having the same
US9097935B2 (en) 2013-02-08 2015-08-04 Samsung Electronics Co., Ltd. Fixing device of diffusing plate and display apparatus having the same

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