KR20130022161A - Backlight unit and liquid crystal display using the same - Google Patents

Backlight unit and liquid crystal display using the same Download PDF

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Publication number
KR20130022161A
KR20130022161A KR1020110084957A KR20110084957A KR20130022161A KR 20130022161 A KR20130022161 A KR 20130022161A KR 1020110084957 A KR1020110084957 A KR 1020110084957A KR 20110084957 A KR20110084957 A KR 20110084957A KR 20130022161 A KR20130022161 A KR 20130022161A
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KR
South Korea
Prior art keywords
light
liquid crystal
optical film
backlight unit
diffraction optical
Prior art date
Application number
KR1020110084957A
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Korean (ko)
Inventor
임희진
방형석
이근식
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020110084957A priority Critical patent/KR20130022161A/en
Publication of KR20130022161A publication Critical patent/KR20130022161A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0252—Diffusing elements; Afocal elements characterised by the diffusing properties using holographic or diffractive means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1842—Gratings for image generation
    • 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
    • G02F1/133553—Reflecting 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

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit and a liquid crystal display device using the same, and in particular, using a diffraction optical film (HOE film) applied to a holographic stereoscopic image display device, a path of light incident on the liquid crystal panel may be used. It is a technical object of the present invention to provide a backlight unit and a liquid crystal display device using the same that can be changed in a direction perpendicular to the direction. To this end, the backlight unit according to the present invention includes a light source mounted on one side of the bottom cover and outputting light; A wedge type light guide plate for condensing light emitted from the light source and received through the light incident surface adjacent to the light source in a vertical direction in the liquid crystal panel direction; And a diffraction optical film for spreading the light output from the wedge-shaped light guide plate to the full viewing angle of the liquid crystal panel.

Description

BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY USING THE SAME}

The present invention relates to a backlight unit, and more particularly, to a backlight unit using a white light emitting diode and a liquid crystal display using the same.

An active matrix type liquid crystal display device displays a moving image by using a thin film transistor (Thin Film Transistor) as a switching element. The liquid crystal display device is applied to a television as well as to display as a display device in portable information equipment, office equipment, computers and the like.

Since the liquid crystal display is not a self-light emitting device, a backlight unit is provided under the liquid crystal panel to display an image using light emitted from the backlight unit.

The backlight unit may be classified into an edge type and a direct type according to the arrangement of light sources. Among these, the direct type backlight unit uses a method of arranging a plurality of light sources under the liquid crystal panel to directly irradiate light directly onto the entire surface of the liquid crystal display panel.

1 is a cross-sectional view of an embodiment of a conventional photometric backlight unit.

As shown in FIG. 1, the photometric backlight unit includes light guide plates 40 disposed below the liquid crystal panel 20, light sources 10 disposed on side surfaces of the light guide plates, and various types of light guide plates inserted between the light guide plates and the liquid crystal panel. It may be configured to include an optical sheet 30, such a photometric backlight unit is mounted on the bottom cover (60). In addition, a reflecting plate 50 may be provided on the bottom surface of the light guide plate 40 or the bottom of the light guide plate.

That is, in the light metering type backlight unit, the light guide plate 40 is disposed below the liquid crystal panel 20, and the light guide plate 40 converts the light emitted from the light source 10 into planar light to irradiate the liquid crystal panel 20. As used, there is an advantage that the liquid crystal display device can be made slim by reducing the thickness of the backlight unit.

As the light source 10 of the backlight unit as described above, an external electrode fluorescent lamp (EEFL), a cold cathode fluorescent lamp (CCFL), a light emitting diode (LED), etc. may be used, but recently, a light emitting diode (LED) is used. Increasingly, there is a white light emitting diode which is applied to such a liquid crystal display.

In addition, the optical sheet 30 may include various types of optical films such as a diffusing sheet and a prism sheet.

Here, the diffusing sheet (Diffusing Sheet) serves to diffuse the light irradiated from the light guide plate 40 to the front of the liquid crystal panel 20, the prism sheet is a light diffused by the diffusion sheet on the bottom surface of the liquid crystal panel It is to change the path of the light so as to be perpendicular to the light.

Meanwhile, the conventional backlight unit should be provided with various kinds of optical films 30 and reflecting plates 50 that perform various functions as described above. That is, the conventional backlight unit requires various optical films, fastening structures, etc. in order to secure 2D luminance and viewing angle.

Therefore, the conventional backlight unit requires a lot of cost to have the above components, and the structure thereof is also complicated.

The present invention is to solve the above-mentioned problems, a backlight unit that can be incident on the front surface of the liquid crystal panel using a diffraction optical film (HOE film) applied to a holographic stereoscopic image display device and It is a technical problem to provide a liquid crystal display device using the same.

According to an aspect of the present invention, there is provided a backlight unit including: a light source mounted on one side of an inner bottom cover to output light; A wedge type light guide plate for condensing light emitted from the light source and received through the light incident surface adjacent to the light source in a vertical direction in the liquid crystal panel direction; And a diffraction optical film for spreading the light output from the wedge-shaped light guide plate to the full viewing angle of the liquid crystal panel.

The wedge-shaped light guide plate may include a turning film to convert light incident from the light source into parallel light and to focus the light in a direction perpendicular to the diffraction optical film.

Paste may be formed in a direction opposite to a light incident surface on which the light source is located among the wedge-shaped light guide plates.

The paste may be formed in a zigzag form.

When the light collected and output from the wedge-shaped light guide plate is incident, the diffraction optical film may output light in a direction designed by a diffraction component recorded on the diffraction optical film.

The surface of the wedge-shaped light guide plate opposite to the light incident surface on which light is incident from the light source may be formed as a curve.

According to an aspect of the present invention, there is provided a backlight unit comprising: a diffraction optical film for injecting light onto a liquid crystal panel; A light source for outputting light; A first reflector for reflecting light transmitted from the light source; And a second reflector for reflecting the light reflected from the first reflector to the diffraction optical film.

The first reflector may be configured of an IPM-HOE.

The first reflecting plate stores a form of the diffraction optical film, reflects light transmitted from the light source and irradiated to a partial region of the first reflecting plate, and uniformly distributes the light to the entire area of the second reflecting plate. Can be distributed.

The second reflector 600 may be composed of an IPM-HOE or a mirror.

The mirror may be composed of a parabolic mirror or a mirror or fresnel mirror in which a flat mirror and a Fresnel lens are combined.

The diffraction optical film may output light in a direction designed by a diffraction component recorded on the diffraction optical film when light that has been collected from the first reflection plate and then reflected by the second reflection plate is incident.

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a backlight unit as described above; The liquid crystal panel for displaying an image; And a driving unit for driving the liquid crystal panel.

According to the above solution, the present invention provides the following effects.

That is, the present invention not only simplifies the structure of the backlight unit by injecting light onto the front surface of the liquid crystal panel using a diffraction optical film (HOE film) applied to a holographic stereoscopic image display device. It provides the effect of reducing the manufacturing cost.

1 is a cross-sectional view of an embodiment of a conventional photometric backlight unit.
2 is an exploded perspective view of a liquid crystal display device having a backlight unit according to a first embodiment of the present invention.
3 and 4 are exemplary views showing a state in which light is reflected in a wedge-type light guide plate applied to a backlight unit according to a first embodiment of the present invention.
5 is a perspective view of a liquid crystal display device having a backlight unit according to a second embodiment of the present invention.
6 is a side view of a liquid crystal display device having a backlight unit according to a second embodiment of the present invention.

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

2 is an exploded perspective view of a liquid crystal display device having a backlight unit according to a first embodiment of the present invention. In particular, the backlight unit using the wedge-shaped light guide plate 200 is shown. 3 and 4 are exemplary views showing a state in which light is reflected from a wedge-type light guide plate applied to a backlight unit according to a first embodiment of the present invention.

The present invention relates to a backlight unit and a liquid crystal display using the same, which can irradiate light onto the front surface of the liquid crystal panel using a diffraction optical film (HOE film) applied to a holographic stereoscopic image display device. In particular, the backlight unit according to the first embodiment of the present invention applies a wedge-shaped light guide plate to condense the light output from the light source in a parallel light state, and then collect the condensed light in a holographic stereoscopic image display device. By injecting a diffraction optical film (HOE (Holographic Optical Element) film) to be applied to the light diffraction optical film to the full viewing angle of the liquid crystal panel, the configuration of a general backlight unit except for the wedge-shaped light guide plate and the diffraction optical film It is characterized by the ability to remove elements (such as optical sheets and reflectors).

To this end, the liquid crystal display device having the backlight unit according to the first embodiment of the present invention is mounted on one side of the liquid crystal panel 400 and the bottom cover (not shown) as shown in FIG. 2 to output light. Wedge light guide plate 200 and light output from the wedge light guide plate for condensing light emitted from the light source 100 and a light incident surface adjacent to the light source in the direction of the liquid crystal panel in parallel light state. It may be configured to include a diffraction optical film 300 for spreading the full viewing angle of the liquid crystal panel.

First, a light emitting diode (Light Emitting Diode: LED) (hereinafter, simply referred to as 'LED') may be used as the light source 100 having excellent energy saving effect and being environmentally friendly, and having advantages such as high response speed. In addition to the light emitting diodes, OLEDs or lasers may be used.

Here, the light source 100 is preferably arranged side by side in a bottom cover (not shown) in the form of a stripe (stripe) of a row.

Next, the wedge type light guide plate 200 is made of a material such as plastic or resin, such as polymethylmethacrylate (PMMA), and is disposed on the top of the wedge type light guide plate by reflecting light emitted from a light source. It performs a function to focus the diffraction optical film 300.

In particular, the wedge-shaped light guide plate 200 is different from a general light guide plate in that light incident from a light source can be focused in a direction perpendicular to the diffraction optical film 300 in a parallel light state.

In detail, the wedge light guide plate 200 may perform a function of condensing the light emitted from the light source 100 into the form of collimated light.

That is, the light guide plate applied to the conventional backlight unit reflects only part of the light toward the liquid crystal panel by scattering or reflecting light incident from the light source, and the light reflected to the side or bottom of the light guide plate is reflected by the liquid crystal panel. It is reflected in the direction.

However, in the wedge-shaped light guide plate 200 applied to the present invention, as shown in FIGS. 3 and 4, the light incident from the light source 100 has parallel light directed toward a predetermined direction, that is, toward the diffraction optical film 300. It has the feature that it can be focused.

That is, as shown in FIGS. 3 and 4, total reflection occurs inside the wedge-shaped light guide plate 200, and the end portion A of the wedge-shaped light guide plate 200, that is, the surface opposite to the incident light incident surface to which light is incident. By making a curve, the light can be emitted in the form of collimated light when the total reflection condition is broken.

On the other hand, the present invention by attaching a turning film (210) to the portion in which the collimated light is emitted from the wedge-shaped light guide plate 200, the light emitted from the wedge-shaped light guide plate 200 at the front angle The optical path may be modified to be incident on the liquid crystal panel.

That is, the wedge-shaped light guide plate 200 is for irradiating parallel light in a direction perpendicular to the diffraction optical film 300 as described above. The function of the wedge-shaped light guide plate 200 constitutes a wedge-shaped light guide plate. The turning film 210 may be implemented. In detail, as illustrated in (b) of FIG. 3, the turning film 210 is a diffraction beam disposed at an upper end of a path of light that is condensed and output obliquely in a parallel light state on the light guide plate 200 itself. It performs a function of changing in the direction perpendicular to the optical film (300).

Meanwhile, the wedge-shaped light guide plate 200 described below includes the turning film 210 as described above.

In addition, the present invention may use pastes as shown in FIG. 4 to correct the focus point in the wedge-shaped light guide plate 200. Here, the facets may be formed in zigzag, causing the same effect on the upper and lower portions of the wedge-shaped light guide plate.

That is, the wedge-shaped light guide plate 200 performs a function of focusing light output from the light source perpendicularly to the diffraction optical film in a parallel light state, and the diffraction optical film 300 spreads the incident light to the entire viewing angle of the liquid crystal panel. It performs the function that makes it possible.

At this time, the diffraction optical film (HOE film) 300 should be recorded so that light can be diffracted according to design conditions, as described below.

Lastly, as described above, the diffraction optical film (HOE film) 300 performs a function of uniformly spreading light output from the wedge-shaped light guide plate in a parallel light state to the entire viewing angle of the liquid crystal panel.

An image of a diffusive light source is recorded in the diffractive optical film 300. By the recorded information, light incident on the diffractive optical film can be evenly irradiated on the entire surface of the liquid crystal panel.

In the backlight unit according to the first embodiment of the present invention as described above, the light incident from the light source 100 using the wedge-shaped light guide plate 200 is collimated perpendicularly to the diffraction optical film in a parallel light state. Then, the light is evenly spread over the entire viewing angle of the liquid crystal panel by the diffraction optical film 300.

That is, when the light collected and output from the wedge-shaped light guide plate 200 is incident, the diffraction optical film 300 may send light in a direction designed by the diffraction component recorded on the diffraction optical film. In the present invention using the same, the diffraction optical film is recorded so that the light incident on the diffraction optical film 300 is evenly distributed over the entire viewing angle of the liquid crystal panel, and the diffraction optical film is attached or positioned on the bottom surface of the liquid crystal panel 400. have.

Therefore, when the light collected using the wedge-shaped light guide plate 200 is incident on the diffraction optical film 300, the light passing through the diffraction optical film 300 may be irradiated onto the entire surface of the liquid crystal panel.

Therefore, the backlight unit according to the first embodiment of the present invention can implement a wide viewing angle LCD without a plurality of optical sheets used in the conventional backlight unit.

5 is a perspective view of a liquid crystal display device having a backlight unit according to a second embodiment of the present invention. In particular, FIG. 5 illustrates a backlight unit using a diffraction optical film (HOE film). 6 is a side view of a liquid crystal display device having a backlight unit according to a second embodiment of the present invention.

In the backlight unit according to the second embodiment of the present invention, a diffraction optical film (HOE film) is used instead of a plurality of optical sheets used in the conventional backlight unit, thereby simplifying the structure of the backlight unit and reducing manufacturing cost. It has the characteristic that it is.

To this end, the liquid crystal display device having the backlight unit according to the second exemplary embodiment of the present invention, as shown in FIG. The diffracted optical film 300, the light source 100 for outputting light, the first reflector 500 for condensing and reflecting the light transmitted from the light source in a parallel light state, and the light reflected from the first reflector to the diffraction optical film It may be configured to include a second reflector 600 for reflecting.

First, a light emitting diode (Light Emitting Diode: LED) (hereinafter, simply referred to as 'LED') may be used as the light source 100 having excellent energy saving effect and being environmentally friendly, and having advantages such as high response speed. In addition to the light emitting diodes, OLEDs or lasers may be used.

Here, as shown in FIG. 5, the light source 100 is preferably arranged side by side in a bottom cover (not shown) in the form of a stripe in a row.

Next, the first reflecting plate 500 performs the function of condensing the light output from the light source into parallel light and reflecting the reflected light to the second reflecting plate. -HOE: Image Panel Memorized-HOE (hereinafter, simply referred to as 'IPM-HOE') may be applied.

The first reflecting plate 500 stores the shape of the diffractive optical film (HOE film) 300 and reflects the light transmitted from the light source and irradiated to a part of the first reflecting plate to reflect the light. 600 to uniformly distribute the light over the entire area. That is, the first reflector 500 performs a function of causing the light transmitted from the light source to be incident on the diffraction optical film 300 with the angle of the reference light used when recording the hologram on the diffraction optical film 300. do.

The first reflector 500 or the above-described diffraction optical film (HOE film) may be composed of any one of photoresist, photopolymer, bleached photo plate, and dichromated gelatin (DCG). Can be.

On the other hand, a holographic optical element (HOE) such as the diffraction optical film (HOE film) 300 or the first reflecting plate (IPM-HOE) 500 as described above is produced by a holographic method. It refers to lenses, mirrors, gratings, prisms, beam splitters, and the like. These HOEs are classified as a type of diffraction optical elements (DOEs) and are referred to as DOEs because they use diffraction effects rather than reflection or refraction. In addition, HOE follows geometrical optics rules and can be used for conventional optical elements. In addition, the HOE appears in a wavelength of a narrow operating efficiency (Operate efficiency), but is not a big problem because it is manufactured using a laser (laser).

Next, the second reflector 600 is for reflecting the light transmitted from the first reflector 500 to the front surface of the diffraction optical film 300, it is configured in various forms using an IPM-HOE or a mirror Can be.

For example, the second reflector 600 may be configured as a parabola mirror, or may be configured as a mirror in which a flat mirror and a Fresnel lens are combined, and use a Fresnel mirror. It may be configured.

Here, the flat mirror and the Fresnel lens combined mirror, the flat mirror (Flat Mirror) and the Fresnel lens (Fresnel Lens) combined mirror, flat mirror (Flat Mirror) and Fresnel lens There may or may not be a gap between the (Fresnel Lens).

In particular, the Fresnel lens may be configured using both a glass type and a film type. The Fresnel lens is briefly described as follows. Fresnel Lens refers to a lens whose thickness is reduced instead of having the same effect as a convex lens. In this case, the reason why the thickness can serve as a convex lens is that the Fresnel lens is divided into several bands so that each band has a prism action, thereby reducing the aberration. That is, a Fresnel lens is a type of condenser, and is a lens used not for making an image but for concentrating light in a desired direction and place. Therefore, the reason for reducing the refractive index in the Fresnel lens is not to sharpen the image, but to play a role of collecting the light in one place.

In addition, the Fresnel mirror is manufactured similar to the principle of the Fresnel Lens, which makes the convex portion of the Convex Lens flat.

Finally, the diffraction optical film (HOE film) 300 is focused in a parallel light state from the first reflecting plate 500, and then changes the light reflected through the second reflecting plate in a direction perpendicular to the liquid crystal panel in the direction of the liquid crystal panel. It has the characteristic of being able to transmit.

The diffraction optical film 300 performs a function of diffracting light incident to the diffraction optical film through the second reflector 600 only in a specific direction, in which a direction designed according to the diffraction component recorded on the diffraction optical film Can send light to

As described above, the backlight unit according to the second exemplary embodiment of the present invention collects the light incident from the light source 100 using the first reflecting plate 500 composed of IPM-HOE, etc. to reflect the second reflecting plate 600. ), And the light reflected back by the second reflector and incident on the diffraction optical film 300 may be spread evenly over the entire surface of the liquid crystal panel.

That is, the diffraction optical film 300 is focused from the first reflecting plate 500, and when the light reflected through the second reflecting plate 600 is incident, the light is sent in the direction designed by the diffraction component recorded in the diffraction optical film. Can be. According to the present invention using the same, the diffraction optical film is recorded so that light incident on the diffraction optical film is evenly distributed over the entire viewing angle, and the diffraction optical film is attached or positioned on the bottom surface of the liquid crystal panel 400.

Therefore, when the light collected by using the first reflector 500 is incident on the diffraction optical film 300, the light passing through the diffraction optical film 300 may be radiated evenly on the entire surface of the liquid crystal panel.

Therefore, the backlight unit according to the second embodiment of the present invention can implement a wide viewing angle LCD without a plurality of optical sheets used in the conventional backlight unit.

On the other hand, the liquid crystal display device using the backlight unit according to the present invention as described above, the liquid crystal panel 400 having a liquid crystal cell matrix, a gate driver (not shown) for driving the gate lines of the liquid crystal panel, the data of the liquid crystal panel A data driver (not shown) for driving lines, a timing controller (not shown) for controlling the gate driver and the data driver, and a backlight unit according to the present invention may be included. Here, the data driver, the gate driver, and the timing controller are collectively called a driver.

First, the liquid crystal panel 400 includes a thin film transistor TFT formed in each region defined by the intersection of the gate lines and the data lines, and a liquid crystal cell including a pixel electrode.

The thin film transistor TFT supplies a pixel signal (image data signal) from the data line to the pixel electrode in response to a scan signal from the gate line. The pixel electrode drives the liquid crystal positioned between the common electrode and the light transmittance in response to the pixel signal.

Next, the timing controller inputs a timing signal input from an external system, that is, a dot clock DCLK, a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, and a data enable signal DE used as a reference clock in the liquid crystal display. The gate control signal GCS for controlling the gate driver and the data control signal for controlling the data driver are generated, and image data is supplied to the data driver.

The gate control signals generated by the timing controller include a gate start pulse GSP, a start signal VST, a gate shift clock signal GSC, a gate output enable signal GOE, and the like.

The data control signals generated by the timing controller include a source start pulse SSP, a source shift clock signal SSC, a source output enable signal SOE, a polarity control signal POL, and the like.

Next, the gate driver supplies a scan signal to gate lines using the gate control signals. Accordingly, the thin film transistors TFT are driven in units of horizontal lines in response to the scan signal.

Next, the data driver converts the input image data into an analog pixel signal (image data signal), and supplies one horizontal line of pixel signals to the data lines every one horizontal period during which the scan signal is supplied to the gate line GL. . In this case, the data driver converts the image data into a pixel signal (image data signal) using gamma voltages supplied from the gamma voltage generator (not shown).

Lastly, the backlight unit according to the present invention may be configured as the first embodiment as shown in FIG. 2 or the second embodiment as shown in FIG. 6, and is disposed on the bottom surface of the liquid crystal panel to provide light to the liquid crystal panel. It performs the function of investigating.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: light source 200: wedge light guide plate
300: diffraction optical film 400: liquid crystal panel
500: first reflection plate (IPM-HOE)
600: second reflection plate (mirror or IPM-HOE)

Claims (13)

A light source mounted on one side of the bottom cover to output light;
A wedge type light guide plate for condensing light emitted from the light source and received through the light incident surface adjacent to the light source in a vertical direction in the liquid crystal panel direction; And
And a diffraction optical film for spreading the light output from the wedge light guide plate to the full viewing angle of the liquid crystal panel. The method of claim 1,
And the wedge-shaped light guide plate includes a turning film for converting light incident from the light source into parallel light and focusing the light in a direction perpendicular to the diffractive optical film. The method of claim 1,
And a paste is formed in a direction opposite to a light incident surface on which the light source is located among the wedge-shaped light guide plates. The method of claim 3, wherein
The paste is formed in a zigzag form, the backlight unit. The method of claim 1,
And the diffraction optical film outputs light in a direction designed by a diffraction component recorded on the diffraction optical film when light collected and output from the wedge-shaped light guide plate is incident. The method of claim 1,
And a surface of the wedge-shaped light guide plate opposite to a light incident surface on which light is incident from the light source is curved. A diffraction optical film for injecting light onto the entire liquid crystal panel;
A light source for outputting light;
A first reflector for reflecting light transmitted from the light source; And
And a second reflector for reflecting the light reflected from the first reflector to the diffraction optical film. The method of claim 7, wherein
The first reflector is an IPM-HOE, the backlight unit. 8. The first reflecting plate according to claim 7, wherein the first reflecting plate stores a form of the diffractive optical film, reflects light transmitted from the light source and irradiated to a partial region of the first reflecting plate, and thus the whole of the second reflecting plate. A backlight unit, characterized in that the light is uniformly distributed in the area. The method of claim 7, wherein
The second reflector (600) is a backlight unit, characterized in that the IPM-HOE or a mirror. 11. The method of claim 10,
The mirror is a back light unit, characterized in that the mirror or fresnel mirror of the combination of a parabolic mirror or a flat mirror and a Fresnel lens. The method of claim 7, wherein
The diffraction optical film, when the light reflected by the second reflecting plate after being collected from the first reflecting plate is incident, the backlight, characterized in that for outputting light in the direction designed by the diffraction component recorded on the diffraction optical film unit. A backlight unit according to any one of claims 1 to 12;
The liquid crystal panel for displaying an image; And
And a driving unit for driving the liquid crystal panel.
KR1020110084957A 2011-08-25 2011-08-25 Backlight unit and liquid crystal display using the same KR20130022161A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9953579B2 (en) 2014-08-22 2018-04-24 Samsung Electronics Co., Ltd. Acousto-optic element array, display apparatus including an acousto-optic element array and method for driving an acousto-optic element array

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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