KR101354426B1 - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

Info

Publication number
KR101354426B1
KR101354426B1 KR1020060134991A KR20060134991A KR101354426B1 KR 101354426 B1 KR101354426 B1 KR 101354426B1 KR 1020060134991 A KR1020060134991 A KR 1020060134991A KR 20060134991 A KR20060134991 A KR 20060134991A KR 101354426 B1 KR101354426 B1 KR 101354426B1
Authority
KR
South Korea
Prior art keywords
light
sheet
liquid crystal
diffusion
lenticular
Prior art date
Application number
KR1020060134991A
Other languages
Korean (ko)
Other versions
KR20080060648A (en
Inventor
정용훈
이만환
Original Assignee
엘지디스플레이 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020060134991A priority Critical patent/KR101354426B1/en
Publication of KR20080060648A publication Critical patent/KR20080060648A/en
Application granted granted Critical
Publication of KR101354426B1 publication Critical patent/KR101354426B1/en

Links

Images

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133615Edge-illuminating devices, i.e. illuminating from the side
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/02Diffusing elements; Afocal elements
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051Diffusing sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055Reflecting element, sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides

Abstract

The present invention relates to a liquid crystal display device that can increase light efficiency, and to provide a liquid crystal display device that can improve optical characteristics while reducing the number of optical sheets. To this end, the liquid crystal display device according to an embodiment of the present invention, the liquid crystal panel for displaying an image; A lamp for irradiating light to the liquid crystal panel; A light collecting sheet for collecting light emitted from the lamp by using a lens; And a diffusion sheet for diffusing the light transmitted from the light collecting sheet and transmitting the light to the liquid crystal panel.

Description

[0001] LIQUID CRYSTAL DISPLAY [0002]

1 is a configuration diagram of an embodiment of a general edge type backlight unit.

2 is a configuration diagram of an embodiment of a general direct type backlight unit.

3 is a diagram illustrating an embodiment of a general bead type diffusion sheet.

Figure 4 is a configuration diagram of one embodiment of a general prism sheet.

Figure 5 is a configuration diagram of an embodiment of a general reflective polarizing sheet.

6 is a configuration diagram of an optical sheet unit applied to the liquid crystal display device according to the first embodiment of the present invention.

7 is a configuration diagram of an optical sheet unit applied to a liquid crystal display according to a second exemplary embodiment of the present invention.

8 is a configuration diagram of an optical sheet unit applied to a liquid crystal display according to a third exemplary embodiment of the present invention.

9 is a configuration diagram of an optical sheet unit and a liquid crystal panel applied to a liquid crystal display according to a fourth embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

10: bottom cover 1, 12: reflector

8, 13 lamp 100 lenticular condensing sheet

200, 400: lenticular diffusion sheet 300: prism sheet

500: polarizing film 600: liquid crystal panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly to a liquid crystal display capable of increasing light efficiency.

Recently, as the society enters the age of full-scale informatization, the display industry that processes and displays a large amount of information has been rapidly developed.

As a result, a liquid crystal display (LCD) has been developed that can meet various demands of the user, such as thinning, light weight, and low power consumption, and is currently replacing the existing cathode-ray tube (CRT). It is in the spotlight as the next generation display device.

The liquid crystal display may be broadly classified into a liquid crystal panel displaying an image displayed to a user and a back light unit for increasing the brightness of the image.

The liquid crystal panel has a structure in which a lower substrate and an upper substrate on which one electric field generating electrode is formed are arranged to face each other, and then a liquid crystal layer is interposed therebetween.

In general, the backlight unit may be classified into an edge type and a direct type according to the arrangement of light sources. Among these, a direct type backlight unit capable of high brightness to be suitable for large size and large screen is widely used.

1 is a configuration diagram of an exemplary edge type backlight unit, and a general edge type backlight unit includes a light emitting part, a waveguide part, and an optical sheet part.

The light emitting portion is composed of a lamp 8 and a lamp housing 7 for protecting the lamp.

The waveguide is located on the light guide panel 2 which makes the light emitted from the lamp 8 into a uniform surface light source, and is located on the rear surface of the light guide plate to reflect the light from the lamp and concentrate it toward the liquid crystal panel side (front). It consists of a reflecting plate (1) that serves to prevent the loss of light from the back or side of the light guide plate.

An optical sheet unit is disposed on the light guide plate to diffuse light from the light guide plate to improve the brightness of the light (diffuser sheet) (3), located on the top of the diffusion sheet to collect light from the light guide plate to improve the viewing angle It is composed of a prism sheet (4, 5) and a protector sheet (6) to be located on the top layer of the backlight unit to prevent damage to the diffusion sheet and prism sheet and to secure a desired viewing angle. have.

As shown in FIG. 1, a general edge type backlight unit includes a light emitting unit including a lamp 8 and a lamp housing 7, a light guide plate, and a reflecting plate to generate a uniform light distribution in a liquid crystal panel. In order to control the direction of light emitted through the light guide plate and to secure a desired contrast (CR), optical sheet parts such as the diffusion sheets 3 and 6 and the prism sheets 4 and 5 are disposed between the light guide plate and the liquid crystal panel.

That is, the edge type backlight unit may include two prism sheets 4 and 5 to obtain a desired viewing angle. Therefore, as the number of prism sheets increases, there is a problem that not only light loss occurs due to the feedback of light emitted from the light guide plate, but also disadvantages in terms of cost reduction.

2 is a configuration diagram of an embodiment of a general direct type backlight unit. 3 is a configuration diagram of one embodiment of a general bead type diffusion sheet, FIG. 4 is a configuration diagram of an embodiment of a general prism sheet, and FIG. 5 is a configuration diagram of an embodiment of a general reflective polarizing sheet. to be.

As shown in FIG. 2, a general direct type backlight unit includes a bottom cover 10 formed of a metal or a synthetic resin, and a plate formed of a white or silver metallic material seated on the bottom cover. It comprises a reflector 12, a plurality of lamps 13 arranged in parallel on the reflecting plate and an optical sheet portion 19 seated on the plurality of lamps.

The optical sheet portion 19 includes a diffusion plate 14 seated on the vertical top of the lamp, a diffusion sheet 15 seated on the top of the diffusion plate, a prism sheet 16 seated on the top of the diffusion sheet, and the prism. It is configured to include a protective sheet 17 is mounted on the top of the sheet to prevent damage to the prism sheet.

A liquid crystal panel (not shown) manufactured by a separate process is mounted on the edge of the edge type backlight unit or the direct type backlight unit, and the liquid crystal panel is coupled to the backlight unit by a support main to display a liquid crystal display. The device is complete. A lower polarizer is attached to a surface of the liquid crystal panel that contacts the optical sheet unit 19, and an upper polarizer is attached to the opposite surface of the liquid crystal panel.

On the other hand, as described above, the edge type backlight unit or the direct type backlight unit, the light emitted from the lamp to make a surface light source through the diffusion sheet (3, 15), the surface light source light to the prism sheet (4, 5) , And condensing and diffusing through the 16, the protective sheet (6, 17) serves to protect the prism of the prism sheet. However, recently, a reflective polarizing sheet (DBEF-D) or the like has been used in place of the protective sheet in order to increase the light collecting efficiency while performing the function of the protective sheet.

As the diffusion sheets 3 and 15, a non-bead type diffusion sheet, or a bead type diffusion sheet in which beads are inserted in an acrylic resin as shown in FIG. 3 is used. .

Light emitted through the diffusion sheets (DS) 3, 15 is collected in front through the prism sheets (condensing sheet) 4, 5, 16 having a prism shape as shown in FIG. The non-polarized light passing through the prism sheet is again polarized and reflected by the reflective polarizing sheet (DBEF-D) or the like as shown in FIG. 5 to enter the liquid crystal panel. The reflective polarizing sheet is composed of a diffusion layer, a reflective polarizing layer, and an adhesive layer.

On the other hand, the conventional backlight unit as described above, the structure of the optical sheet and the stacking method may be adjusted to increase the white brightness, but in this case there is a problem that the contrast (CR) may fall. In addition, in order to increase the contrast (CR), the structure of the optical sheet and the method of red, etc. can be adjusted, but in this case there is a problem that characteristics such as brightness or viewing angle may be degraded.

In addition, in the conventional backlight unit as described above, since the light emitted from the lamp is canceled while passing through the diffusion sheet and the reflecting plate, the light incident on the liquid crystal panel is not uniformly incident, and thus, the liquid crystal The problem arises that the luminance of the image displayed on the panel becomes uneven.

That is, the conventional optical sheet has a problem that the luminance, contrast (CR) and viewing angle, which are optical characteristics of the liquid crystal display, are not sufficiently satisfied.

Accordingly, an object of the present invention for solving the above problems is to provide a liquid crystal display device which can improve the optical characteristics while reducing the number of optical sheets.

In order to achieve the above object, a liquid crystal display device according to an embodiment of the present invention, the liquid crystal panel for displaying an image; A lamp for irradiating light to the liquid crystal panel; A light collecting sheet for collecting light emitted from the lamp by using a lens; And a diffusion sheet for diffusing the light transmitted from the light collecting sheet and transmitting the light to the liquid crystal panel.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 6 is a diagram illustrating an optical sheet unit applied to a liquid crystal display according to a first exemplary embodiment of the present invention, and illustrates an optical sheet unit configured to improve both luminance and contrast.

The liquid crystal display according to the present invention includes a liquid crystal panel (not shown) for displaying an image and a backlight unit for irradiating uniform light to the liquid crystal display panel.

In the liquid crystal panel, liquid crystal cells are arranged in an active matrix between an upper substrate and a lower substrate, and pixel electrodes and a common electrode for applying an electric field to each of the liquid crystal cells are provided. Each of these pixel electrodes is connected to a thin film transistor used as a switch element. The pixel electrode drives the liquid crystal cell along with the common electrode according to the data signal supplied through the thin film transistor to display an image corresponding to the video signal.

The backlight unit may include at least one lamp, a reflector for reflecting light emitted from the lamp toward the liquid crystal panel, and an optical sheet for diffusing and condensing the light reflected from the lamp or the reflector to the liquid crystal panel. Contains wealth.

The reflecting plate improves the efficiency of visible light by reflecting the light emitted from the lamp to be irradiated to the optical sheet portion.

The lamp is used to generate light required for the liquid crystal panel, and CCFL, EEFL, LED, and the like are used.

Meanwhile, the backlight unit applied to the liquid crystal display according to the present invention may be classified into an edge type and a direct type according to the arrangement of light sources.

First, the edge type backlight unit further includes a lamp housing for fixing the lamp, and further includes a light guide plate on top of the reflecting plate to reflect light emitted from the lamp to the liquid crystal panel with a uniform light distribution. . That is, in the liquid crystal display device according to the present invention using the edge type backlight, the optical sheet portion is disposed between the light guide plate and the liquid crystal panel.

Next, in the direct type backlight unit, the reflecting plate is disposed at the lower end of the plurality of lamps, and a bottom cover for supporting the plurality of lamps and the reflecting plate is disposed at the lower end of the reflecting plate. That is, in the liquid crystal display device according to the present invention using a direct type backlight unit, the optical sheet unit is disposed between the plurality of lamps and the liquid crystal panel.

On the other hand, the optical sheet portion applied to the liquid crystal display device according to the present invention for condensing the light emitted from at least one or more lamps as possible to the light incident on the liquid crystal panel in a vertical direction, on the liquid crystal panel The brightness and contrast of the displayed image are increased.

As shown in FIG. 6, the optical sheet unit applied to the liquid crystal display according to the first exemplary embodiment of the present invention for increasing the brightness and contrast as described above may include a lenticular light collecting sheet (prism sheet) ( The lenticular diffusion sheet 200 may be formed on the top of the upper surface 100.

The lenticular condensing sheet 100 collects the light emitted from the lamp and transmits the light to the lenticular diffusion sheet 200, while the light or lenticular condensing sheet 100 is reflected from the lenticular diffusion sheet 200. In order to reflect the light reflected by itself back to the lenticular diffusion sheet 200 is provided with a reflector on the lower surface.

The lenticular diffusion sheet 200 evenly spreads the light transmitted from the lenticular condensing sheet 100 and transmits the light to the liquid crystal panel.

That is, in the conventional liquid crystal display device, the light emitted from the lamp is canceled while passing through the diffusion sheet and the reflective sheet, and thus the luminance of the image displayed on the liquid crystal panel is not uniformly incident on the liquid crystal panel. And there is a problem that the contrast is lowered and not uniform, but the lenticular light collecting sheet 100 and the lenticular diffusion sheet 200 to be applied to the present invention are all directional (polarization) sheet, so the light emitted from the lamp The light may be collected without canceling and may be transmitted to the liquid crystal panel.

Each of the lenticular light collecting sheet 100 and the lenticular diffusion sheet 200 performing the above function is formed on the diffusion layers 101 and 201 for diffusing the light generated from the lamp, and the upper surface of the diffusion layer. And light collecting layers 102 and 202 for collecting light generated from the lamps.

The diffusion layers 101 and 201 may be formed in a plate shape by including a material having a high refractive index (for example, 'beads') that can diffuse light, and diffuse visible light generated from a lamp. The light collecting layers 102 and 202 are supported.

The light collecting layers 102 and 202 are formed on the upper surfaces of the diffusion layers 101 and 201 to be in contact with the liquid crystal panel. The light collecting layers 102 and 202 may be formed of a micro lens array or a lenticular lens array, and may be disposed in a direction parallel to or perpendicular to the arrangement of the lamps. In addition, the lens array or the lenticular lens array formed of the light collecting layers 102 and 202 may be densely formed so that empty regions do not occur on the diffusion layers 101 and 202.

The lenticular light collecting sheet 100 and the lenticular diffusion sheet 200 are sheets having directionality, and are arranged in a vertical direction with each other. That is, the lenticular light collecting sheet 100 placed on the top of the lamp is arranged such that the arrangement of the light collecting layers 102 is parallel to the arrangement of the lamps, and the lenticular diffusion sheet 200 is the lenticular diffusion. An arrangement of the light collecting layers 202 of the sheets may be disposed to be perpendicular to the light collecting layers 102 of the lenticular light collecting sheets. However, the present invention is not limited thereto. Thus, the lenticular light collecting sheet 100 placed on the top of the lamp is arranged such that the arrangement of the light collecting layers 102 is perpendicular to the arrangement of the lamps. The lenticular diffusion sheet 200 may be arranged such that the arrangement of the light collecting layers 202 of the lenticular diffusion sheet is perpendicular to the light collecting layer 102 of the lenticular condensing sheet.

Meanwhile, the optical sheet unit applied to the liquid crystal display according to the first exemplary embodiment of the present invention may be configured by adding the diffusion sheet or the protective sheet to an upper end of the lenticular diffusion sheet 200.

FIG. 7 is a configuration diagram of an optical sheet unit applied to a liquid crystal display according to a second exemplary embodiment of the present invention. Similar to the liquid crystal display according to the first exemplary embodiment, luminance and contrast (contrast, contrast) are adjusted. The optical sheet part comprised so that both can be improved is shown.

As shown in FIG. 7, the optical sheet part applied to the liquid crystal display device according to the second embodiment of the present invention for increasing the brightness and contrast as described above is disposed on the upper end of the lenticular diffusion sheet 200. The prism sheet 300 may be configured to be seated.

The lenticular diffusion sheet 200 performs a function of uniformly diffusing the light emitted from the lamp and transmitting the light to the prism sheet 300. The lenticular diffusion sheet 200 is applied to the liquid crystal display according to the first embodiment of the present invention. It has the same configuration as the lenticular diffusion sheet 200. That is, the lenticular diffusion sheet 200 illustrated in FIGS. 6 and 7 is a diffusion sheet having the same components. Accordingly, the lenticular diffusion sheet 200 may include a diffusion layer 201 for diffusing light generated from the lamp and a light collecting layer 102 formed on an upper surface of the diffusion layer and condensing light generated from the lamp. 202. In addition, the lenticular diffusion sheet 200 has a direction as described above.

The prism sheet 300 collects light transmitted from the lenticular diffusion sheet and transmits the light to the liquid crystal panel. The prism sheet 300 includes a diffusion layer 301 for diffusing light and a prism 302 formed on an upper surface of the diffusion layer 301 and condensing light generated from the lamp. It has directionality.

That is, in the conventional liquid crystal display device, the light emitted from the lamp is canceled while passing through the diffusion sheet and the reflective sheet, and thus the luminance of the image displayed on the liquid crystal panel is not uniformly incident on the liquid crystal panel. And the contrast is lowered and not uniform, but since the lenticular diffusion sheet 200 and the prism sheet 300 applied to the present invention are all directional sheets, the light emitted from the lamp does not cancel. The light may be focused on and transmitted to the liquid crystal panel.

The lenticular diffusion sheet 200 and the prism sheet 300 are sheets having directivity, and are arranged in a vertical direction with each other. That is, the lenticular diffusion sheet 200 placed on the upper end of the lamp is disposed such that the arrangement of the light collecting layers 202 is aligned with the arrangement of the lamps, and the prism sheet 300 of the prism 302 The arrangement may be arranged to be perpendicular to the light collecting layer 202 of the lenticular diffusion sheet. However, the present invention is not limited thereto. That is, the lenticular diffusion sheet 200 placed on the upper end of the lamp has an arrangement of the light collecting layer 202 of the lenticular diffusion sheet. The prism sheet 300 may be disposed to be vertical, and the prism sheet 300 may be arranged such that the arrangement of the prism 302 is perpendicular to the light collecting layer 202 of the lenticular diffusion sheet, that is, parallel to the lamp.

On the other hand, the optical sheet portion applied to the liquid crystal display device according to the second embodiment of the present invention, the diffusion sheet or protective sheet for protecting the prism sheet 300 is added to the upper end of the prism sheet 300 is to be configured Can be.

FIG. 8 is a diagram illustrating an optical sheet unit applied to a liquid crystal display according to a third exemplary embodiment of the present invention, and illustrates an optical sheet unit configured to solve a problem of external appearance of a liquid crystal panel.

As shown in FIG. 8, the optical sheet part applied to the liquid crystal display according to the third exemplary embodiment of the present invention has a lenticular diffusion sheet 400 on the top of a lenticular light collecting sheet (prism sheet) 100. ) May be configured to be seated, and the lenticular diffusion sheet 400 is formed with a haze (Haze) (404).

The lenticular condensing sheet 100 collects the light emitted from the lamp and transmits the light to the lenticular diffusion sheet 400, while the light or lenticular condensing sheet 100 is reflected from the lenticular diffusion sheet 400. ) Having a reflector 103 on the lower surface to reflect the light reflected from itself back to the lenticular diffusion sheet 400, and includes the same configuration as the lenticular condensing sheet 100 described in FIG. It is doing the same thing. Thus, the lenticular light collecting sheet 100 is a diffusion layer 101 for diffusing light generated by the lamp, a light collecting layer 102 formed on the upper surface of the diffusion layer, and collects the light generated from the lamp and The reflector 103 is provided and has a constant directivity with respect to the light emitted from the lamp.

The lenticular diffusion sheet 400 performs a function of uniformly diffusing light transmitted from the lenticular light condensing sheet 100 and transmitting the light to the liquid crystal panel, and the lenticular diffusion sheet 200 described with reference to FIG. 6. Similar configurations are included. Therefore, the lenticular diffusion sheet 400 is a diffusion layer 401 for diffusing the light transmitted from the lenticular condensing sheet 100, and a light collecting layer 402 formed on the upper surface of the diffusion layer, and collects the light. ) And has a constant directivity with respect to the light.

The light collecting layers 102 and 402 may be formed of a micro lens array or a lenticular lens array. However, the light collecting layer 402 of the lenticular diffusion sheet 400 is additionally subjected to haze 404 to uniformly diffuse the light transmitted from the lenticular light collecting sheet 100. Haze treatment refers to clouding of the light collecting layer 402 in order to give an effect such as fog to the light collecting layer 402.

That is, since the lenticular light collecting sheet 100 and the lenticular diffusion sheet 400 have a constant direction with respect to light, the liquid crystal panel is provided through the lenticular light collecting sheet 100 and the lenticular diffusion sheet 400. The light transmitted to the surface also has a certain directionality, and thus the surface of the liquid crystal panel has a pattern of a constant light, which may result in deterioration of image quality or poor appearance. Therefore, in the liquid crystal display according to the third exemplary embodiment of the present invention, the haze treatment of the lenticular diffusion sheet 400 solves the problem of poor appearance of the liquid crystal panel.

FIG. 9 is a configuration diagram of an optical sheet unit and a liquid crystal panel applied to a liquid crystal display according to a fourth exemplary embodiment of the present invention. It is shown.

As shown in FIG. 9, the optical sheet part applied to the liquid crystal display according to the fourth exemplary embodiment of the present invention has a lenticular diffusion sheet 200 formed on an upper end of a lenticular light collecting sheet (prism sheet) 100. ) May be formed in a seated shape, and a polarizing film 500 is attached to a lower surface of the liquid crystal panel 600 placed on the top of the optical sheet unit. The polarizing film 500 has a haze (504) is formed.

The lenticular condensing sheet 100 collects the light emitted from the lamp and transmits the light to the lenticular diffusion sheet 200, while the light or lenticular condensing sheet 100 is reflected from the lenticular diffusion sheet 200. ) Having a reflector 103 on the lower surface to reflect the light reflected from itself back to the lenticular diffusion sheet 200, the same configuration as the lenticular condensing sheet 100 described in FIG. It is doing the same thing. Thus, the lenticular light collecting sheet 100 is a diffusion layer 101 for diffusing light generated by the lamp, a light collecting layer 102 formed on the upper surface of the diffusion layer, and collects the light generated from the lamp and The reflector 103 is provided and has a constant directivity with respect to the light emitted from the lamp.

The lenticular diffusion sheet 200 serves to uniformly diffuse the light transmitted from the lenticular light condensing sheet 100 and transmit the light to the liquid crystal panel, and the lenticular diffusion sheet 200 described with reference to FIG. 6. The same configuration is included. Thus, the lenticular diffusion sheet 200 is a diffusion layer 201 for diffusing light transmitted from the lenticular condensing sheet 100, and a light collecting layer formed on an upper surface of the diffusion layer and condensing the light ( 202 and has a constant directivity to the light.

The light collecting layers 102 and 202 may be formed of a micro lens array or a lenticular lens array.

On the other hand, the polarizing film 500 is a film having a polarizing function that passes only a predetermined direction component of the light, is located on both sides of the liquid crystal panel 600 is a material that determines the optical characteristics of the liquid crystal panel. In the polarizing film 500 applied to the present invention, a haze 504 treatment is additionally performed to evenly diffuse the light transmitted from the lenticular diffusion sheet 200. Haze treatment refers to the processing of the polarizing film 500 in order to give an effect such as fog in the light collecting layer 402.

That is, since the lenticular light collecting sheet 100 and the lenticular diffusion sheet 200 have a constant direction with respect to light, the liquid crystal panel is provided through the lenticular light collecting sheet 100 and the lenticular diffusion sheet 200. The light transmitted to the surface also has a certain directionality, and thus the surface of the liquid crystal panel 600 appears to have a pattern of a certain light, thereby deteriorating the quality of the image or appearance may be poor. Therefore, in the liquid crystal display according to the fourth exemplary embodiment of the present invention, the haze 504 treatment is applied to the polarizing film 500 attached to the lower surface of the liquid crystal panel 600, thereby preventing a problem of appearance defects of the liquid crystal panel. I'm solving it.

In the third embodiment of the present invention, the lenticular diffusion sheet 400 is haze treatment, but the haze treatment is difficult to the lenticular diffusion sheet 400 or only by the haze treatment of the lenticular diffusion sheet 400. When the problem of appearance failure of the liquid crystal panel 600 is not solved, the polarizing film 500 may be additionally used by haze treatment. That is, the haze 404 process may be performed only on the lenticular diffusion sheet 400 as in the third embodiment, and the haze 504 process may be performed only on the polarizing film 500 as in the fourth embodiment. The haze treated lenticular diffusion sheet and the polarizing film may be applied in one liquid crystal display.

The liquid crystal display device according to the present invention as described above has an excellent effect of improving the optical characteristics of the liquid crystal display device.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims (9)

  1. A liquid crystal panel for displaying an image;
    A lamp for irradiating light to the liquid crystal panel;
    A light collecting sheet for collecting light emitted from the lamp by using a lens; And
    A diffusion sheet for diffusing the light transmitted from the light collecting sheet and transmitting the light to the liquid crystal panel;
    The diffusion sheet,
    A plate-shaped diffusion layer for diffusing light; And
    A light collecting layer formed on an upper surface of the diffusion layer, the light collecting layer including a lens for collecting light passing through the diffusion layer,
    The light collecting sheet,
    A plate-shaped diffusion layer for diffusing light;
    A light collecting layer formed on an upper surface of the diffusion layer and configured to collect light passing through the diffusion layer; And
    A reflector formed on a rear surface of the diffusion layer to reflect light reflected from the diffusion sheet or light reflected from the diffusion layer or the light collection layer toward the diffusion sheet,
    The light collecting layer of the light collecting sheet and the light collecting layer of the diffusion sheet are disposed perpendicular to each other,
    The light collecting sheet and the diffusion sheet have a direction to the light,
    And an upper surface of the reflecting portion is in contact with a rear surface of the light collecting sheet.
  2. delete
  3. delete
  4. delete
  5. delete
  6. The method of claim 1,
    The diffusion sheet is a haze treatment, characterized in that the liquid crystal display device.
  7. The method of claim 1,
    And a polarizing film attached to the lower surface of the liquid crystal panel is subjected to a haze treatment.
  8. delete
  9. The method according to claim 1,
    The diffusion layer,
    Liquid crystal display comprising a bead (bead) material having a high refractive index.
KR1020060134991A 2006-12-27 2006-12-27 Liquid crystal display KR101354426B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020060134991A KR101354426B1 (en) 2006-12-27 2006-12-27 Liquid crystal display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020060134991A KR101354426B1 (en) 2006-12-27 2006-12-27 Liquid crystal display

Publications (2)

Publication Number Publication Date
KR20080060648A KR20080060648A (en) 2008-07-02
KR101354426B1 true KR101354426B1 (en) 2014-01-22

Family

ID=39813149

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020060134991A KR101354426B1 (en) 2006-12-27 2006-12-27 Liquid crystal display

Country Status (1)

Country Link
KR (1) KR101354426B1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07151909A (en) * 1993-11-29 1995-06-16 Dainippon Printing Co Ltd Film lens and surface light source using the same
KR20000048103A (en) * 1998-12-14 2000-07-25 카네코 히사시 Liquid crystal display device
KR20010076359A (en) * 2000-01-21 2001-08-11 가나이 쓰토무 Optical functional sheet, face-profiled light source using the sheet and image display apparatus using the sheet
KR20030054948A (en) * 2001-12-26 2003-07-02 엘지.필립스 엘시디 주식회사 BackLight Unit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07151909A (en) * 1993-11-29 1995-06-16 Dainippon Printing Co Ltd Film lens and surface light source using the same
KR20000048103A (en) * 1998-12-14 2000-07-25 카네코 히사시 Liquid crystal display device
KR20010076359A (en) * 2000-01-21 2001-08-11 가나이 쓰토무 Optical functional sheet, face-profiled light source using the sheet and image display apparatus using the sheet
KR20030054948A (en) * 2001-12-26 2003-07-02 엘지.필립스 엘시디 주식회사 BackLight Unit

Also Published As

Publication number Publication date
KR20080060648A (en) 2008-07-02

Similar Documents

Publication Publication Date Title
KR101094772B1 (en) Tiled display device
JP5059525B2 (en) Liquid crystal display
CN1249500C (en) Liquid crystal display device and electronic apparatus
CN101529280B (en) Prism sheet and liquid crystal display
CN1241053C (en) Method for making laminated film, laminated film, and method for making display device
KR0184630B1 (en) The light guide sheet and a method of manufacturing the same and a liquid crystal display using the backlight and the backlight unit using the light guide sheet
US20060098140A1 (en) Liquid crystal display device and fabrication method thereof
TWI402576B (en) Backlight unit and liquid crystal display module including the same
JP2005347062A (en) Backlight device and liquid crystal display device
KR101167440B1 (en) Liquid crystal display device
US20130235561A1 (en) Bezel-free display device using directional backlighting
JP4923671B2 (en) Liquid crystal display
JP2005249942A (en) Display device
CN102193221A (en) Display apparatus
US8284346B2 (en) Backlight unit and liquid crystal display device including the same
JP2003279988A (en) Liquid crystal display device and electronic appliance
JP3544349B2 (en) Liquid crystal display
KR101005466B1 (en) Transparent see-through display device
US20050185115A1 (en) Liquid crystal display device with backlight unit using microlens array and fabricating method of microlens array
KR101385474B1 (en) Liquid crystal display device
KR101351886B1 (en) One-body multi functional optical sheet for liquid crystal display device
KR100721009B1 (en) Backlight unit including a plurality of diffusion sheet and liquid crystal display device including the same
KR100556833B1 (en) Liquid crystal display apparatus
US7559683B2 (en) Backlight assembly, light guiding plate including plurality of discontinuously formed prisms
JP2006518541A (en) Backlight assembly and liquid crystal display device having the same

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20161214

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20171218

Year of fee payment: 5

FPAY Annual fee payment

Payment date: 20181226

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20191212

Year of fee payment: 7