KR20130017495A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
KR20130017495A
KR20130017495A KR1020110079947A KR20110079947A KR20130017495A KR 20130017495 A KR20130017495 A KR 20130017495A KR 1020110079947 A KR1020110079947 A KR 1020110079947A KR 20110079947 A KR20110079947 A KR 20110079947A KR 20130017495 A KR20130017495 A KR 20130017495A
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KR
South Korea
Prior art keywords
light
liquid crystal
crystal display
light source
image
Prior art date
Application number
KR1020110079947A
Other languages
Korean (ko)
Inventor
이근식
임희진
방형석
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020110079947A priority Critical patent/KR20130017495A/en
Publication of KR20130017495A publication Critical patent/KR20130017495A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/32—Holograms used as optical elements
    • 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
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/40—Materials having a particular birefringence, retardation

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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)

Abstract

Disclosed is a liquid crystal display device capable of improving luminance and image quality in a liquid crystal display device having dual image display.
The disclosed liquid crystal display device includes a liquid crystal display panel having first pixels and second pixels for displaying different first and second images, and a light source for displaying a first image of the liquid crystal display panel. A first light source unit, a second light source unit providing light for displaying a second image of the liquid crystal display panel, and light from the first light source unit are refracted to a first area in which the first image is displayed, and the first light source unit And a diffraction optical film having a diffraction pattern for refracting light from the light into a second region where a second image is displayed, wherein the first and second light source units have angles at both sides facing each other and are inclined to be symmetric with each other. To emit light.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device capable of improving brightness and image quality in a liquid crystal display device for dual image display.

A CRT (cathode ray tube), which is one of the widely used display devices, is mainly used for monitors such as a TV, a measurement device, and an information terminal device. However, due to the weight and size of the CRT itself, Could not respond positively to the response of

As a solution to such a problem, the liquid crystal display device has been gradually widened due to its features such as lightness, thinness, and low power consumption driving. Accordingly, the liquid crystal display device is proceeding in the direction of large-sized, thin, and low power consumption in response to the demand of the user.

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 backlight unit included in the liquid crystal display device is classified into a direct type and an edge type.

The direct backlight unit has a structure in which a plurality of light sources are arranged in one direction under the volcanic plate to directly provide light toward the liquid crystal display panel.

The edge type backlight unit has a structure in which a light source is disposed on a side surface of the light guide plate. The liquid crystal display panel is disposed on the light guide plate. In the edge type backlight unit, light emitted from the light source enters the light guide plate and is converted into surface light, and the surface light converted from the light guide plate is provided to the liquid crystal display panel.

Recently, a liquid crystal display of a dual image display in which different images are displayed in a left / right direction of the display device

The liquid crystal display of the dual image display includes a barrier film on which a light blocking pattern and a light transmitting pattern having a slit structure are alternately formed in one direction.

The barrier film blocks and transmits light traveling through the liquid crystal display panel from the backlight unit to separate the image to the left and right sides of the liquid crystal display.

Here, the liquid crystal display panel alternately outputs image data of the left image and the right image for each pixel.

However, a general dual image display liquid crystal display device displays a left / right image by using a barrier film in which a light blocking pattern and a light transmitting pattern of a slit structure are alternately formed, and light loss occurs due to the light blocking pattern. Therefore, there is a problem in that the overall luminance is lowered and the image quality is deteriorated due to structural limitations of the plurality of light blocking patterns and the light transmitting patterns.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device capable of improving luminance and image quality in a liquid crystal display device having a dual image display.

According to an embodiment of the present invention,

A liquid crystal display panel having first pixels and second pixels displaying different first and second images; A first light source unit providing light for displaying a first image of the liquid crystal display panel; A second light source unit providing light for displaying a second image of the liquid crystal display panel; And a diffraction pattern for refracting the light from the first light source unit to the first area where the first image is displayed and for diffracting the light from the first light source unit to the second area where the second image is displayed. Comprising a diffractive optical film, the first and second light source units are provided with angles on both sides facing each other, and emits light in an inclined direction so as to be symmetrical to each other.

The liquid crystal display device of the present invention implements dual image display by diffracting light in left / right directions from first and second light source units in which diffractive optical films made in a thin film form provide light having symmetrical inclination angles. In contrast to a liquid crystal display device having a barrier film of a general liquid crystal display device, brightness and image quality may be improved.

That is, the diffraction optical film of the present invention diffracts the light provided from the backlight unit in the left / right direction, thereby minimizing light loss in contrast with the barrier film on which the light blocking pattern for blocking the light is formed, and blocking the light of the slit structure. The image quality deterioration by a pattern and a light transmission pattern can be prevented.

1 is an exploded perspective view illustrating a liquid crystal display of a dual image display according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the liquid crystal display taken along the line II ′ of FIG. 1.
3 is a view illustrating a method of manufacturing the diffractive optical film of FIG. 1.
4 is a diagram illustrating a diffraction optical film manufactured by the method of manufacturing the diffraction optical film of FIG. 3.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, embodiments of the present invention will be described in detail.

One embodiment of the present invention is intended to enable a person skilled in the art to fully understand the technical idea of the present invention. Therefore, the present invention is not limited to the embodiments described below, and other embodiments can be added on the basis of the technical idea of the present invention.

According to an exemplary embodiment of the present invention, a liquid crystal display device includes a liquid crystal display panel having first pixels and second pixels that display different first and second images, and a first light providing light for displaying a first image of the liquid crystal display panel. Refracting the light source unit, the second light source unit providing light for displaying the second image of the liquid crystal display panel, and the light from the first light source unit to the first region where the first image is displayed, and from the first light source unit And a diffraction optical film having a diffraction pattern for refracting light of the light into a second region in which a second image is displayed, wherein the first and second light source units have angles at both sides facing each other and are inclined to be symmetric with each other. Exit the light.

1 is an exploded perspective view illustrating a liquid crystal display of a dual image display according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view of the liquid crystal display cut along the line II ′ of FIG. 1.

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. And a panel guide 120 supporting the liquid crystal display panel 110 and coupled to the backlight unit 130.

In addition, the liquid crystal display of the present invention further includes a diffraction optical film 200 disposed below the liquid crystal display panel 110 and refracting light such that different images are displayed on the left and right sides of the liquid crystal display.

The liquid crystal display panel 110 includes a thin film transistor substrate 111 and a color filter substrate 113 bonded together so as to maintain a uniform cell gap facing each other, and a liquid crystal layer interposed between the two substrates.

Although not shown in detail in the drawings, the thin film transistor substrate 111 and the color filter substrate 113 will be described in detail. In the thin film transistor substrate 111, a plurality of gate lines and data lines cross each other to define pixels. A thin flim transistor (TFT) is provided at each of the crossing regions of the transistors, and is connected in a one-to-one correspondence with pixel electrodes mounted on each pixel. The color filter substrate 113 includes a color filter of R, G, and B colors corresponding to each pixel, and a black matrix bordering each of the color filters and covering a gate line, a data line, and a thin film transistor.

A driving PCB 115 is provided at the edge of the liquid crystal display panel 110 to supply driving signals to the gate line and the data line.

The driving PCB 115 is 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).

Although not shown in detail in the drawing, the liquid crystal display panel 110 has a structure in which different image data are supplied to each adjacent pixel in order to display different images.

That is, the liquid crystal display panel 110 of the present invention is supplied with different image data between adjacent pixels in order to display the left and right images in one direction parallel to the gate line.

Specifically, the liquid crystal display panel 110 of the present invention may be supplied with the left image data for the left image display and the even-numbered pixels for the right image data for the right image display in the direction parallel to the gate line. have.

The backlight unit 130 disposed below the liquid crystal display panel 110 may include a bottom cover 180 having an upper surface opened, a first light source unit 150a disposed at one side of the bottom cover 180, and the bottom. It includes a second light source unit 150b disposed on the other side of the cover 180.

In addition, the backlight unit 130 is disposed in parallel with the first and second light source units 150a and 150b and is disposed on the light guide plate 160 to convert point light or linear light into surface light. Optical sheets 140 for diffusing and condensing light, and a reflective sheet 170 provided below the light guide plate 160 to reflect light traveling in a lower direction of the light guide plate 160 toward the liquid crystal display panel 110. More).

The first light source unit 150a includes a first printed circuit board 151a and a plurality of first light emitting diodes 153a disposed at regular intervals on the first printed circuit board 151a.

The second light source unit 150b includes a second printed circuit board 151b and a plurality of second light emitting diodes 153b disposed at regular intervals on the second printed circuit board 151b.

The first light source unit 150a is provided on one inner surface of the panel guide 120 and has a predetermined inclination angle. That is, one side inner surface of the panel guide 120 provided with the first light source unit 150a may have a predetermined inclination angle.

The first light source unit 150a provides light for displaying an image of the first region r1, which may be defined as a left image via the diffractive optical film 200 by the constant tilt angle.

The second light source unit 150b is provided on the other inner surface of the panel guide 120 and has a predetermined inclination angle. That is, the other inner surface of the panel guide 120 provided with the second light source unit 150b may have a predetermined inclination angle.

The second light source unit 150b provides light for displaying an image of the second region r2 which can be defined as a right image via the diffractive optical film 200 by the constant tilt angle.

The first and second light source units 150a and 150b have tilt angles that are symmetrical to each other. That is, the first and second light source units 150a and 150b provide light traveling in directions opposing each other.

In the liquid crystal display of the present invention, the first light source unit is provided with a diffraction optical film 200 under the liquid crystal display panel 110 to display different left and right images, and provides light for displaying the left image. 150a and a second light source unit 150b that provides light for displaying the right image.

In an exemplary embodiment of the present invention, the first and second light emitting diodes 153a and 153b are limited to the light source. However, the present invention is not limited thereto, and a lamp may be provided as the light source.

In the liquid crystal display of the present invention, the first and second light source units 150a and 150b are alternately driven to display images of the first and second regions r1 and r2 through the diffraction optical film 200. can do.

Here, although the first and second light source units 150a and 150b have a limited inclination angle, the inner surface of the panel guide 120 has a predetermined inclination angle, and thus the structure of providing the light irradiated at an inclined angle is not limited thereto. The first and second printed circuit boards 151a and 151b having inclined surfaces or the first and second to emit light at a predetermined inclination angle such that the first and second light source units 150a and 150b have a predetermined inclination angle. Like the light emitting diodes 153a and 153b, any structure in which light having a predetermined tilt angle may be provided to the liquid crystal display panel 110 may be applied.

The diffractive optical film 200 of the present invention may be made of a holographic optical element (HOE).

The diffractive optical film 200 uses a diffraction phenomenon of light and includes a diffraction pattern diffracting the light so that the left / right image is displayed.

The diffractive optical film 200 receives light from the first and second light source units 150a and 150b having different angles and wavelengths of incident light, and passes the light to the first and second regions r1 and r2, respectively. To control.

The diffractive optical film 200 is manufactured in a thin film form, and by diffracting the light provided from the first and second light source units 150a and 150b in a left / right direction to implement dual image display, a general liquid crystal display The brightness and image quality may be improved as compared to the liquid crystal display device having the barrier film of the device.

That is, the diffraction optical film 200 according to the present invention diffracts the light provided from the backlight unit 130 in the left / right direction, thereby minimizing light loss compared to the barrier film on which the light blocking pattern for blocking light is formed. The deterioration of image quality due to the light blocking pattern and the light transmitting pattern of the slit structure can be prevented.

The liquid crystal display device of the present invention is limited to the diffraction optical film 200 provided below the liquid crystal display panel 110, but is not limited thereto and may be provided on the liquid crystal display panel 110. .

In the dual image display, the liquid crystal display may be implemented in any one of a two-dimensional mode and a three-dimensional mode.

FIG. 3 is a diagram illustrating a method of manufacturing the diffractive optical film of FIG. 1, and FIG. 4 is a diagram of a diffraction optical film manufactured by the method of manufacturing the diffractive optical film of FIG. 3.

As shown in Figures 3 and 4, the diffractive optical film 200 according to an embodiment of the present invention is on a base film of any one of photoresist, photopolymer, bleached photographic plate, and dichromated gelatin (DCG). The diffraction pattern 205 of the target area a is recorded using the first and second laser beams 201 and 203.

The diffraction pattern 205 for diffracting light into the first region (r1 in FIG. 2) is a holographic pattern in a region where laser light emitted from the first and second laser beams 201 and 203 which are symmetrical to each other cross each other. This can be formed.

That is, the holographic pattern may be formed through interference of laser light emitted from the first and second laser beams 201 and 203. In the present invention, the holographic pattern is defined as the diffraction pattern 205. FIG.

The diffractive optical film 200 forms a diffraction pattern 205 according to angles and distances of the first and second laser beams 201 and 203, and the diffraction pattern 205 has an imaging characteristic due to the pattern spacing. Is determined, and the diffraction efficiency is determined.

The imaging characteristic refers to the position and aberration of the image, and the diffraction efficiency is determined by the shape and distribution of the diffraction pattern 205.

Accordingly, the diffraction optical film 200 of the present invention varies the design of the diffraction pattern 205 including the angle and distance of the laser light of the first and second laser beams 201 and 203 so that the first image of the dual image display can be changed. And the second region (r1, r2 in Fig. 2) can be designed as desired.

The diffractive optical film 200 is manufactured in a thin film form, and by diffracting light in left and right directions from the first and second light source units providing light having symmetrical inclination angles, the dual image display is generally performed. In contrast to the liquid crystal display device having the barrier film of the liquid crystal display device, the brightness and image quality may be improved.

That is, the diffraction optical film 200 according to the present invention diffracts the light provided from the backlight unit in a left / right direction, thereby minimizing light loss compared to the barrier film on which the light blocking pattern for blocking light is formed, and the slit structure. It is possible to prevent deterioration in image quality due to the light blocking pattern and the light transmitting pattern.

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.

150a: first light source unit 150b: second light source unit
153a: first light emitting diode 153b: second light emitting diode
200: diffractive optical film 201: first laser beam
203: second laser beam 205: diffraction pattern

Claims (8)

A liquid crystal display panel having first pixels and second pixels displaying different first and second images;
A first light source unit providing light for displaying a first image of the liquid crystal display panel;
A second light source unit providing light for displaying a second image of the liquid crystal display panel; And
A diffraction pattern having a diffraction pattern for refracting light from the first light source unit to a first area where the first image is displayed and for diffracting light from the first light source unit to a second area where the second image is displayed Including an optical film,
The first and second light source units are provided with angles at both sides facing each other and emit light in an inclined direction so as to be symmetrical to each other. The method according to claim 1,
The diffractive optical film is a holographic optical element (HOE) liquid crystal display device. The method according to claim 1,
The diffraction optical film is a liquid crystal display device wherein the diffraction pattern is formed in the base film of any one of a photoresist, photopolymer, bleached photo plate, and dichromated gelatin (DCG). The method according to claim 1,
And the diffraction pattern is defined as a holographic pattern in which the laser light from the first and second laser beams that irradiate the laser light in different directions cross and interfere with each other. The method according to claim 1,
The diffraction optical film is provided on the upper or lower portion of the liquid crystal display panel. The method according to claim 1,
The first and second light source units include any one of a light emitting diode and a lamp. The method according to claim 1,
And a panel guide supporting a lower edge of the liquid crystal display panel, wherein the inner surface of the panel guide having the first and second light source units facing each other has a predetermined inclination angle. The method according to claim 1,
And the first and second light source units are sequentially driven alternately.
KR1020110079947A 2011-08-11 2011-08-11 Liquid crystal display device KR20130017495A (en)

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KR1020110079947A KR20130017495A (en) 2011-08-11 2011-08-11 Liquid crystal display device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160038130A (en) * 2014-09-29 2016-04-07 엘지디스플레이 주식회사 Thin Flat Type Controlled Viewing Window Display Using The Same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160038130A (en) * 2014-09-29 2016-04-07 엘지디스플레이 주식회사 Thin Flat Type Controlled Viewing Window Display Using The Same

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