KR20150084266A - Heat shield liquid crystal display device - Google Patents

Heat shield liquid crystal display device Download PDF

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Publication number
KR20150084266A
KR20150084266A KR1020140004101A KR20140004101A KR20150084266A KR 20150084266 A KR20150084266 A KR 20150084266A KR 1020140004101 A KR1020140004101 A KR 1020140004101A KR 20140004101 A KR20140004101 A KR 20140004101A KR 20150084266 A KR20150084266 A KR 20150084266A
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KR
South Korea
Prior art keywords
liquid crystal
crystal display
display panel
film
light
Prior art date
Application number
KR1020140004101A
Other languages
Korean (ko)
Inventor
성지용
Original Assignee
성지용
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Filing date
Publication date
Application filed by 성지용 filed Critical 성지용
Priority to KR1020140004101A priority Critical patent/KR20150084266A/en
Publication of KR20150084266A publication Critical patent/KR20150084266A/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
    • G02F1/133502—Antiglare, refractive index matching layers
    • 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
    • G02F1/133509—Filters, e.g. light shielding masks
    • 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
    • G02F1/133528—Polarisers

Abstract

A liquid crystal display panel for displaying images; a backlight unit disposed below the liquid crystal display panel for providing light to the liquid crystal display panel; and a backlight unit disposed between the backlight unit and the liquid crystal display panel, First and second polarizing plates disposed on the upper portion of the display panel for cross-polarizing light, an anti-reflection film disposed on the second polarizing plate and reflecting sunlight irradiated from the outside to the liquid crystal display panel at various angles, An anti-glare film, and an infrared ray blocking film interposed between the second polarizing plate and the anti-glare film and blocking infrared rays from natural light transmitted through the anti-glare film.

Description

{HEAT SHIELD LIQUID CRYSTAL DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heat shielding liquid crystal display device, and more particularly, to a heat shielding liquid crystal display device in which light generated from a light source passes through liquid crystal and implements an image.

The liquid crystal display includes a thin film transistor substrate, a color filter substrate, and a liquid crystal display panel including a liquid crystal layer. The backlight unit provides light to the liquid crystal display panel.

The backlight unit is divided into direct type and edge type according to the position of the light source. The edge type is a structure in which a light source is installed on a side surface of a light guide plate, and is applied to a liquid crystal display device which is relatively small in size, such as a laptop type and a desktop computer. Such an edge type backlight unit has a long durability life, is advantageous for thinning of a liquid crystal display device, and has better light uniformity than a direct-type backlight unit.

The direct type is a structure that is mainly developed with the size of the liquid crystal display device being enlarged. In this structure, one or more light sources are arranged on the back surface of the liquid crystal display panel to supply light to the liquid crystal display panel. Such a direct-type backlight unit has advantages in that it can utilize a plurality of light sources as compared with an edge-type backlight unit, thereby ensuring a high luminance.

The light source receives the electric energy and emits light as well as the heat. The emitted heat reaches the upper diffusion plate, passes through the diffusion plate through most of the conduction, and is then transmitted to the liquid crystal display panel through the upper optical film. When the liquid crystal of the liquid crystal display panel is sensitive to heat and continuously receives heat of high temperature from the light source, there arises a problem of causing malfunction of the liquid crystal. Accordingly, a heat dissipation method for preventing a heat generated in a circuit board for driving a light source and a light source from spreading over a large area to be transmitted to a liquid crystal display panel has been studied in various angles.

Particularly, when the liquid crystal display device is driven outdoors, the liquid crystal display device is directly exposed to sunlight and solar heat. Therefore, the light in the infrared region included in the sunlight may deteriorate the liquid crystal, and the display screen may be partially or wholly blackened.

Accordingly, an object of the present invention is to provide a liquid crystal display device capable of suppressing deterioration of liquid crystal due to heat.

A liquid crystal display device according to an embodiment of the present invention includes: a liquid crystal display panel displaying an image; a backlight unit disposed below the liquid crystal display panel and providing light to the liquid crystal display panel; First and second polarizing plates disposed between the panels and above the liquid crystal display panel to cross-polarize the light, a second polarizing plate disposed above the second polarizing plate, for emitting sunlight irradiated from the outside to the liquid crystal display panel, An anti-glare film diffusing at various angles, and an infrared ray blocking film interposed between the second polarizing plate and the anti-glare film, the infrared ray blocking film blocking natural light transmitted through the anti-glare film .

In one embodiment of the present invention, the second polarizing plate may include a low reflection coating layer provided to suppress reflection of sunlight transmitted through the infrared ray blocking film.

In one embodiment of the present invention, the infrared ray shielding film may include polymethyl methacrylate (PMMA).

A liquid crystal display device according to an embodiment of the present invention includes: a liquid crystal display panel displaying an image; a backlight unit disposed below the liquid crystal display panel and providing light to the liquid crystal display panel; First and second polarizing plates disposed between the panels and above the liquid crystal display panel to cross-polarize the light, a second polarizing plate disposed above the second polarizing plate, for emitting sunlight irradiated from the outside to the liquid crystal display panel, An anti-glare film which reflects light at various angles, and an infrared ray blocking film interposed between the second polarizing plate and the anti-glare film, the infrared ray blocking film blocking natural light transmitted through the anti-glare film And the second polarizing plate includes a low reflection coating layer provided to suppress reflection of sunlight transmitted through the infrared ray shielding film, Film is polymethyl methacrylate: include (PMMA Poly Methyl Meta Acrylate).

According to embodiments of the present invention, an anti-glare film disposed on the second polarizing plate and reflecting sunlight irradiated from the outside to the liquid crystal display panel at various angles, and an anti- And an infrared ray blocking film interposed between the anti-glare film and blocking the infrared rays of natural light transmitted through the anti-glare film, thereby deterioration of the liquid crystal layer due to radiant energy of sunlight can be suppressed. Further, since the low reflection coating layer is additionally formed on the surface of the second polarizing plate, the liquid crystal display can display the screen using the visible light as the visible light transmitted through the infrared ray blocking film is drawn into the liquid crystal display panel .

1 is a cross-sectional view illustrating a liquid crystal display device according to an embodiment of the present invention.
2 is an exploded cross-sectional view illustrating the liquid crystal display device of FIG.

Hereinafter, a liquid crystal display according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention in order to clarify the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1 is a cross-sectional view illustrating a liquid crystal display device according to an embodiment of the present invention. 2 is an exploded cross-sectional view illustrating the liquid crystal display device of FIG.

1 and 2, a liquid crystal display according to embodiments of the present invention includes a liquid crystal display panel 110, a backlight unit 120, first and second polarizers 131 and 133, (140) and an infrared ray blocking film (150).

The liquid crystal display panel 110 includes a thin film transistor substrate (not shown) on which a thin film transistor is formed, a color filter substrate (not shown) facing the thin film transistor substrate, a liquid crystal layer (Not shown). The liquid crystal display panel 110 forms a screen by adjusting the orientation of the liquid crystal contained in the liquid crystal layer, but it is required to receive light from the backlight unit 120 located behind the liquid crystal display panel 110 because it is a non-light emitting device.

The backlight unit 120 is disposed below the liquid crystal display panel 110. The backlight unit 120 supplies light to the liquid crystal display panel 110.

The first and second polarizing plates 131 and 133 are disposed between the backlight unit 120 and the liquid crystal display panel 110 and above the liquid crystal display panel 110, respectively. The first and second polarizing plates 131 and 133 are provided to cross-polarize light transmitted through the liquid crystal display panel 110.

The anti-glare film 140 is disposed on the second polarizer 133. The anti-glare film 140 can reflect sunlight irradiated from the outside to the liquid crystal display panel 110 at various angles. That is, since the irregular patterns of various shapes are formed on the surface of the anti-glare film 140, the light directed toward the anti-glare film 140 can be irregularly reflected at various angles. As a result, the anti-glare film 140 can block natural light incident from the outside toward the liquid crystal display panel 110. Thus, deterioration of the liquid crystal layer included in the liquid crystal display panel 110 exposed to the natural light can be suppressed.

For example, the anti-glare film 140 can be formed by coating a spherical silica particle on its surface with a gel state. Alternatively, the anti-glare film 140 may have an irregular pattern formed on the upper portion thereof.

The infrared ray blocking film 150 is disposed between the second polarizing plate 133 and the anti-glare film 140. The infrared ray blocking film 150 may block infrared rays of natural light transmitted through the anti-glare film. The infrared ray blocking film includes a transparent material such as polymethyl methacrylate (PMMA). The infrared ray blocking film can transmit visible light and selectively block infrared rays. Therefore, it is possible to suppress the irradiation of the inside of the liquid crystal display panel, that is, the liquid crystal layer, with infrared rays that affect the deterioration of the liquid crystal.

For example, products such as PR70 (trade name, 3M (US)) and IR900 (trade name, 3M (US)) can be used by purchasing the infrared ray shielding film.

The infrared ray shielding film 150 may be formed by stacking a plurality of infrared ray shielding films 150, if necessary. The infrared ray blocking film 150 may have various thicknesses in consideration of the type of the backlight unit 120, the size of the liquid crystal display panel 110, the position to be supported, and the like.

In one embodiment of the present invention, a low reflection coating layer (not shown) may be additionally formed on the second polarizer 133. The low reflection coating layer can cancel out the light reflected on the surface by canceling each other to realize low reflection on the surface. The low reflection coating layer may be formed by coating a plurality of thin film layers having different refractive indexes. That is, since the second polarizer 133 having the low reflection coating layer is provided, natural light in the visible light region transmitted through the infrared ray blocking film 150 is reflected by the reflection member (not shown) formed in the backlight unit 120 And the brightness of the liquid crystal display device 100 can be improved by being used in the liquid crystal display panel 110.

Evaluation for Liquid Crystal Display Panels _ For brightness and color coordinate changes

A liquid crystal display device (Examples 1 and 2) including a first polarizing plate, second polarizing plates having a low reflection coating layer, an anti-glare film, and an infrared blocking film was used. The IR blocking film was applied to Examples 1 and 2 as PR70 (trade name, 3M (US)) and IR900 (trade name, 3M (US)). On the other hand, a liquid crystal display device (comparative example) including a first polarizing plate and second polarizing plates without a low reflection coating layer was prepared.

The luminance and chromaticity coordinates of the liquid crystal display device (Example 1 and Example 2 and Comparative Example) were measured. The results are shown in the table below.

Measure Comparative Example Example 1 Example 2 Luminance
(CD) Color coordinates (Cx) Color coordinates (Cy) Luminance
(CD) Color coordinates
(Cx) Color coordinates
(Cy) Luminance
(CD) Color coordinates
(Cx) Color coordinates
(Cy) One 455 0.262 0.313 507 0.259 0.317 672 0.263 0.320 2 448 0.262 0.314 506 0.259 0.317 671 0.263 0.321 3 451 0.262 0.314 503 0.258 0.317 674 0.263 0.320 Average 451 0.262 0.314 505 0.259 0.317 672 0.263 0.320

When comparing the luminance values described in Table 1, it can be confirmed that the luminance values are increased to about 12% and 45.8% in the first and second embodiments, respectively, as compared with the comparative example. Also, when comparing the color coordinates, it can be seen that there is a color coordinate change of about 0.6 to 2.2% in Examples 1 and 2, as compared with Comparative Example. In other words, even in the case of Examples 1 and 2, the change in color coordinates is insignificant when compared with the comparative example, and it can be confirmed that almost no image quality change occurs.

Claims (4)

A liquid crystal display panel for displaying an image;
A backlight unit disposed below the liquid crystal display panel and providing light to the liquid crystal display panel;
First and second polarizers disposed between the backlight unit and the liquid crystal display panel and disposed on the liquid crystal display panel, respectively, for cross-polarizing light;
An anti-glare film disposed on the second polarizing plate and diffusing solar light radiated from the outside toward the liquid crystal display panel at various angles; And
And an infrared blocking film interposed between the second polarizing plate and the anti-glare film, the infrared blocking film blocking natural light among the natural light transmitted through the anti-glare film. The liquid crystal display according to claim 1, wherein the second polarizer comprises a low reflection coating layer provided to suppress reflection of sunlight transmitted through the infrared ray blocking film. The liquid crystal display device according to claim 1, wherein the infrared ray blocking film comprises polymethyl methacrylate (PMMA). A liquid crystal display panel for displaying an image;
A backlight unit disposed below the liquid crystal display panel and providing light to the liquid crystal display panel;
First and second polarizers disposed between the backlight unit and the liquid crystal display panel and disposed on the liquid crystal display panel, respectively, for cross-polarizing light;
An anti-glare film disposed on the second polarizer plate and reflecting sunlight irradiated from the outside to the liquid crystal display panel at various angles; And
And an infrared blocking film interposed between the second polarizing plate and the anti-glare film and blocking infrared rays from natural light transmitted through the anti-glare film,
Wherein the second polarizer includes a low reflection coating layer provided to suppress reflection of sunlight transmitted through the infrared ray shielding film,
Wherein the infrared ray blocking film comprises polymethyl methacrylate (PMMA).
KR1020140004101A 2014-01-13 2014-01-13 Heat shield liquid crystal display device KR20150084266A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109116602A (en) * 2018-08-21 2019-01-01 惠州市华星光电技术有限公司 Display panel, display device and mobile terminal
WO2022092564A1 (en) * 2020-10-27 2022-05-05 삼성전자주식회사 Display module and manufacturing method therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109116602A (en) * 2018-08-21 2019-01-01 惠州市华星光电技术有限公司 Display panel, display device and mobile terminal
WO2022092564A1 (en) * 2020-10-27 2022-05-05 삼성전자주식회사 Display module and manufacturing method therefor

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