KR20110071034A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
KR20110071034A
KR20110071034A KR1020090127599A KR20090127599A KR20110071034A KR 20110071034 A KR20110071034 A KR 20110071034A KR 1020090127599 A KR1020090127599 A KR 1020090127599A KR 20090127599 A KR20090127599 A KR 20090127599A KR 20110071034 A KR20110071034 A KR 20110071034A
Authority
KR
South Korea
Prior art keywords
light
liquid crystal
crystal display
display panel
guide plate
Prior art date
Application number
KR1020090127599A
Other languages
Korean (ko)
Inventor
박주언
이원호
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 KR1020090127599A priority Critical patent/KR20110071034A/en
Publication of KR20110071034A publication Critical patent/KR20110071034A/en

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Classifications

    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0026—Wavelength selective element, sheet or layer, e.g. filter or grating
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means 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
    • G02B6/0055—Reflecting element, sheet or layer
    • 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
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • 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

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

Abstract

The present invention discloses a liquid crystal display device capable of improving visibility.

The disclosed liquid crystal display device includes a liquid crystal display panel, a light source disposed under the liquid crystal display panel to provide light to the liquid crystal display panel, a light guide plate disposed in parallel with the light source to convert point light into surface light, and a liquid crystal display. A first polarizing plate provided on the upper surface of the panel and a second polarizing plate provided between the light source and the light guide plate.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device that can improve the visibility.

Cathode ray tube (CRT), one of the widely used display devices, is mainly used for monitors such as TVs, measuring devices, and information terminal devices, but the size and weight of electronic products are reduced due to the weight and size of CRT itself. Could not actively respond to the response.

As a solution to this problem, the liquid crystal display device has a tendency that its application range is gradually widening due to the features such as light weight, thinning, low power consumption driving. Accordingly, in order to meet the needs of users, liquid crystal display devices are progressing in the direction of large area, thinning, and low power consumption.

BACKGROUND ART A liquid crystal display device is a display device that displays an image by controlling an amount of light passing through a liquid crystal, and is widely used for advantages such as thinning and low power consumption.

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 back of the liquid crystal display panel to provide light for visually representing an image.

The liquid crystal display panel has a structure in which the thin film transistor substrate and the color filter substrate are disposed to face each other, and the thin film transistor substrate and the color filter substrate are bonded by a seal pattern, and then liquid crystal is injected therebetween.

Upper and lower polarizers are attached to upper and lower portions of the liquid crystal display panel to control light transmission.

Recently, when a liquid crystal display is provided outdoors with high illumination, a transflective method using external light and internal light has been developed.

The transflective liquid crystal display device is divided into a reflection area having a reflection layer for reflecting external light for each pixel of the liquid crystal display panel, and a transmission area displayed by using a backlight unit. Selectively driven.

However, the transflective liquid crystal display device selectively divides one pixel into a reflection area and a transmission area to selectively drive, thereby reducing transmittance and visibility.

In addition, a general liquid crystal display device has a complicated process such as a stepped part process and a divided alignment process of pixels divided into a reflection area and a transmission area to implement a reflection mode and a transmission mode.

An object of the present invention is to provide a liquid crystal display device capable of improving visibility.

Liquid crystal display device according to an embodiment of the present invention,

A liquid crystal display panel; A light source disposed under the liquid crystal display panel to provide light to the liquid crystal display panel; A light guide plate disposed in parallel with the light source and converting point light into surface light; A first polarizer provided on an upper surface of the liquid crystal display panel; And a second polarizing plate provided between the light source and the light guide plate.

In the liquid crystal display according to the exemplary embodiment of the present invention, a first polarizing plate is provided on an upper surface of the liquid crystal display panel, and a second polarizing plate is provided between the light source and the light guide plate so that one pixel is not divided into a transmission and a reflection area. The structure uses the entire pixel as a transmissive and reflective region, and has an advantage of improving transmittance as compared with a general transflective liquid crystal display.

That is, the present invention has the advantage that the visibility can be improved by simultaneously using the external light and the light of the backlight unit without dividing the pixel into the transmission and reflection areas.

In addition, the present invention has a structure that can eliminate the complicated process such as the step portion process and the segmentation orientation divided into a reflection area and a transmission area for each pixel in order to implement a reflection mode and a transmission mode image display of a general transflective liquid crystal display device As a result, the process of the liquid crystal display device can be simplified.

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

1 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 2 is a view illustrating paths of external light and internal light in one pixel, and FIG. 3 is a liquid crystal display according to reflection and transmission. Simulation graph showing the operation of the device.

As shown in FIG. 1 and FIG. 2, the liquid crystal display according to the exemplary embodiment of the present invention is provided with a liquid crystal display panel 110 on which an image is displayed and is disposed under the liquid crystal display panel 110 to provide light. The backlight unit 120 may include a support main 118 that supports an edge of a lower surface of the liquid crystal display panel 110 and is coupled to the backlight unit 120.

The liquid crystal display of the present invention further includes a top case 100 surrounding the edge of the top surface of the liquid crystal display panel 110 and coupled to the backlight unit 120.

Although not shown in detail, the liquid crystal display panel 110 may be a thin film transistor (TFT) substrate 113 and a color filter substrate 111 bonded together to maintain a uniform cell gap facing each other, and the two substrates. And a liquid crystal layer interposed therebetween.

In the thin film transistor substrate 113, a plurality of gate lines are formed, a plurality of data lines intersecting the plurality of gate lines are formed, and a thin film transistor (TFT) is formed at an intersection area of the gate line and the data line. do.

The color filter substrate 111 has a color filter formed to correspond to each pixel, and a black matrix is formed between the color filters.

The first polarizer 181 is disposed on the upper surface of the liquid crystal display panel 110.

A gate driving printed circuit board (114) for supplying a scan signal to a gate line is provided at an edge of the liquid crystal display panel 110, and a data driving printed circuit board (115) for supplying a data signal to a data line. ) Is provided.

The gate and data driving PCBs 114 and 115 are electrically connected to the liquid crystal display panel 110 by a chip on film 117. Here, the COF 117 may be changed to a tape carrier package (TCP).

The backlight unit 120 is disposed in parallel with the bottom cover 170 having an upper surface, a light source 150 provided on at least one inner side of the bottom cover 170, and the light source 150. A light guide plate 140 for converting light incident from the light source 150 into surface light, a light source housing 151 for guiding light emitted from the light source 150 to the light guide plate 140, and an image on the light guide plate 140. The optical sheets 130 arranged at the light emitting diodes 130 to condense and diffuse light, and the light disposed under the light guide plate 140 and traveling toward the lower surface of the light guide plate 140 to be reflected toward the liquid crystal display panel 110. Reflective sheet 160 to reduce light loss.

The second polarizer 183 is disposed between the light source 150 and the light guide plate 140.

The second polarizing plate 183 polarizes the light emitted from the light source 150 to transmit only the first polarized light.

That is, only the first light polarized by the second polarizing plate 183 is incident on the light guide plate 140.

The first light incident on the LGP 140 undergoes total reflection (reflection, refraction, and scattering) by the interior of the LGP 140 and the reflective sheet 160 to form the surface light in the direction in which the LCD panel 110 is disposed. Is emitted.

The first light incident on the liquid crystal display panel 110 is second polarized by the first polarizing plate 181 to display an image.

Meanwhile, the external light is incident on the backlight unit 120 through the liquid crystal display panel 110 through the second light polarized by the first polarizing plate 181.

The second light is reflected by the reflective sheet 160 of the backlight unit 120 to be second-polarized by the first polarizer 181 via the liquid crystal display panel 110 to display an image.

Here, the first and second light polarized from the first and second polarizing plates 181 and 183 are defined as light polarized perpendicular to each other.

The liquid crystal display of the present invention displays an image by using external light (for example, sunlight) and light of the backlight unit 120 at the same time.

Referring to the operation of the liquid crystal display of the present invention with respect to one pixel, the second light polarized through the first polarizing plate 181 is incident on the entire surface of one pixel and is incident on the reflective sheet 160. Reflected to the front of the pixel (pixel).

That is, the second light is reflected to the entire surface of the pixel by using external light, thereby displaying the entire image of the pixel.

The first light polarized by the second polarizer 183 is totally reflected from the light guide plate 140 and the reflective sheet 160 to be incident on the front of the pixel to display an image.

In the pixel of the present invention, the first light and the second light in which the light of the external light and the backlight unit 120 are polarized are simultaneously incident on the entire surface, whereby the entire pixel is defined as a reflection and transmission area.

Referring to FIG. 3, when the entire pixel is used as a reflection and transmission region, and the external light and the light of the backlight unit 120 are used at the same time, the pixel operates in the reflection and transmission mode. It can be seen that it proceeds at the same time.

As described above, in the liquid crystal display according to the exemplary embodiment of the present invention, a first polarizing plate 181 is provided on an upper surface of the liquid crystal display panel 110, and a second light source is disposed between the light source 150 and the light guide plate 140. A polarizing plate 183 is provided so that a single pixel is not divided into a transmissive and reflective region, and the entire pixel is used as a transmissive and reflective region. The transmittance is improved in comparison with a general transflective liquid crystal display. It has the advantage of being able to.

That is, the present invention has the advantage that the visibility can be improved by simultaneously using the external light and the light of the backlight unit 120 without dividing the pixel into the transmission and reflection areas.

In addition, the present invention can omit a complicated process such as a step difference process and a divided orientation divided into a reflection area and a transmission area for each pixel in order to implement a reflection mode and a transmission mode image display of a general transflective liquid crystal display device. As a result, the process of the liquid crystal display device can be simplified.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present 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.

1 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

2 is a diagram illustrating a path of external light and internal light in one pixel.

3 is a simulation graph illustrating an operation of a liquid crystal display according to reflection and transmission.

Claims (8)

A liquid crystal display panel; A light source disposed under the liquid crystal display panel to provide light to the liquid crystal display panel; A light guide plate disposed in parallel with the light source and converting point light into surface light; A first polarizer provided on an upper surface of the liquid crystal display panel; And And a second polarizing plate provided between the light source and the light guide plate. The method according to claim 1, And the second polarizing plate polarizes the light emitted from the light source to provide polarized first light to the light guide plate. The method of claim 2, And the first light is totally reflected by the light guide plate and a reflective sheet disposed below the light guide plate and provided to the liquid crystal display panel. The method according to claim 1, The first polarizing plate polarizes external light to provide the polarized second light to the liquid crystal display panel. 5. The method of claim 4, And the second light is reflected by a reflective sheet disposed below the light guide plate via the liquid crystal display panel and provided to the liquid crystal display panel. The method according to claim 2 and 4, And the first and second lights are light polarized perpendicularly to each other. The method according to claim 1, And all the pixels of the liquid crystal display panel share a transmission area and a reflection area. The method according to claim 1, And the liquid crystal display panel displays an image by simultaneously using external light polarized by the first polarizing plate and light of a light source polarized by the second polarizing plate.
KR1020090127599A 2009-12-20 2009-12-20 Liquid crystal display device KR20110071034A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090127599A KR20110071034A (en) 2009-12-20 2009-12-20 Liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090127599A KR20110071034A (en) 2009-12-20 2009-12-20 Liquid crystal display device

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KR20110071034A true KR20110071034A (en) 2011-06-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130037600A (en) * 2011-10-06 2013-04-16 엘지디스플레이 주식회사 Smart window display

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130037600A (en) * 2011-10-06 2013-04-16 엘지디스플레이 주식회사 Smart window display

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