KR101118988B1 - Back light unit and liquid crystal display device using the same - Google Patents

Abstract

The present invention relates to a backlight unit and a liquid crystal display device using the same to increase luminance and improve luminance uniformity; A base pattern layer, an upper pattern layer having a plurality of lenses continuously formed in a first direction on an upper side of the base member, and a plurality of continuously formed in a second direction crossing the first direction on a lower side of the base member A light guide plate including a lower pattern layer having an inclined protrusion; A reflection member having a plurality of inclined recesses formed concave to correspond to the plurality of inclined protrusions; And a plurality of light emitting diode substrates disposed on the plurality of inclined recesses and configured to irradiate light to each of the plurality of inclined protrusions, and a back light unit and a liquid crystal display using the same.

Description

BACK LIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME}

The present invention relates to a backlight unit and a liquid crystal display, and more particularly, to a backlight unit and a liquid crystal display using the same to increase luminance and improve luminance uniformity.

In general, a liquid crystal display includes a backlight unit by a liquid crystal display panel including a plurality of liquid crystal cells arranged in a matrix and a plurality of control switches for switching image data to be supplied to the liquid crystal cells. The amount of light transmitted from the Back Light Unit) is adjusted to display a desired image on the screen.

In recent years, large screen monitors and televisions have been released as large screens of the above-mentioned liquid crystal display devices are required.

Although the thickness of the liquid crystal display panel does not increase greatly even when the liquid crystal display device is large, as described above, the size and thickness of the backlight unit increase in proportion to the size of the liquid crystal display panel. In this case, the size and thickness of the backlight unit according to the large screen of the liquid crystal display is due to an increase in the area of the light guide plate which increases in proportion to the size of the liquid crystal display panel.

Accordingly, a general liquid crystal display device has the following problems due to an increase in the size and thickness of the backlight unit according to the large screen of the liquid crystal display panel.

First, as the area of the light guide plate increases, luminance decreases and there is a problem of non-uniformity.

Second, there is a problem in that there is a limit in slimming due to the thickness of the backlight unit.

Third, there is a limit to increase the brightness contrast of the bright and dark parts of the display image, because the irradiated light of a constant luminance irrespective of the image displayed on the liquid crystal display panel, and has a high power consumption problem. have.

Disclosure of Invention The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a backlight unit and a liquid crystal display device using the same to increase luminance and improve luminance uniformity.

In addition, the present invention provides a backlight unit and a method for increasing the brightness contrast of the display image and reducing power consumption by using local dimming that partially controls the backlight unit according to the display image. It is a technical problem to provide a liquid crystal display device.

According to an aspect of the present invention, there is provided a backlight unit including an upper pattern layer having a base member, a plurality of lenses continuously formed in a first direction on an upper side of the base member, and a lower side of the base member. A light guide plate including a lower pattern layer having a plurality of inclined protrusions continuously formed in a second direction crossing the first direction; A reflection member having a plurality of inclined recesses formed concave to correspond to the plurality of inclined protrusions; And a plurality of light emitting diode substrates provided on the plurality of inclined recesses to irradiate light to each of the plurality of inclined protrusions.

Each of the plurality of inclined protrusions protrudes to have an isosceles triangular cross section including a reflection surface formed to be inclined at a predetermined inclination from a lower side of the lower pattern layer and a light incident surface formed perpendicular to an end of the reflection surface. It is done.

The light guide plate may further include a plurality of reflective patterns formed on reflective surfaces of each of the plurality of inclined protrusions.

The density of the plurality of reflective patterns is increased from the vertex formed by the reflective surface and the light incident surface of the inclined protrusion toward the lower side of the lower pattern layer.

형태 중 어느 하나의 형태를 가지도록 상기 반사면에 음각 또는 양각되어 형성된 것을 특징으로 한다.Each of the plurality of reflective patterns

It is characterized in that the intaglio or embossed on the reflective surface to have any one of the forms.

Each of the plurality of inclined concave portions is concave to include an inclined surface formed to face the reflecting surface so that each of the plurality of inclined protrusions can be inserted therein and a vertical surface on which the light emitting diode substrate is installed. Characterized in that formed.

The reflective member may further include a plurality of substrate insertion grooves formed on a vertical surface of each of the plurality of inclined recesses, in which the light emitting diode substrate is installed.

The base member is made of a poly methyl methacrylate (PMMA) material, and the upper pattern layer and the lower pattern layer is made of a methyl methacrylate (MMA) material.

According to an aspect of the present invention, a liquid crystal display device includes: a liquid crystal display panel configured to display an image by adjusting light transmittance; A backlight unit radiating light onto the liquid crystal display panel; A backlight driver driving each of the plurality of light emitting diode substrates; And a panel driver configured to drive the liquid crystal display panel and control the backlight driver, wherein the backlight unit has a base member and an upper portion having a plurality of lenses continuously formed in a first direction on an upper side of the base member. A light guide plate including a pattern layer, and a lower pattern layer having a plurality of inclined protrusions formed continuously in a second direction crossing the first direction below the base member; A reflection member having a plurality of inclined recesses formed concave to correspond to the plurality of inclined protrusions; And a plurality of light emitting diode substrates provided on the plurality of inclined recesses to irradiate light to each of the plurality of inclined protrusions.

The liquid crystal display panel displays the image by dividing the image into a plurality of display blocks so as to correspond to each of the plurality of light emitting diode substrates.

The panel driver may include a timing controller configured to analyze data signals to be supplied to the plurality of display blocks, generate a dimming signal for each block corresponding to each of the display blocks, and provide the dimming signal to the backlight driver.

The backlight driver may individually control driving of each of the plurality of light emitting diode substrates based on the dimming signal for each block provided from the timing controller.

As described above, the backlight unit and the liquid crystal display using the same have the following effects.

First, a plurality of lenses are formed on the light guide plate, a plurality of inclined protrusions are formed below the light guide plate, and a plurality of light emitting diode substrates are disposed to face each of the plurality of inclined protrusions, thereby improving brightness of the light guide plate. In addition, there is an effect that can improve the uniformity of the brightness.

Second, according to the slimming of the light guide plate, the overall thickness is reduced, thereby achieving the slimming.

Third, by dividing the light guide plate into a plurality of blocks so as to correspond to each of the plurality of light emitting diode substrates, and individually controlling the light emitting diode substrates corresponding to each block, brightness contrast between light and dark portions can be increased, and power consumption can be increased. There is an effect that can be reduced.

Fourth, the input data to be displayed on the liquid crystal display panel divided into a plurality of display blocks is analyzed for each display block to generate dimming data for each block, and local dimming of the backlight unit is performed based on the generated dimming data for each block. It is possible to improve brightness contrast by reducing the partial luminance of and to reduce power consumption.

1 is an exploded perspective view for schematically illustrating a backlight unit according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating a cutting plane of AA illustrated in FIG. 1.
3 is a rear perspective view of the light guide plate illustrated in FIG. 1.
4 is a plan view illustrating an arrangement structure of the light emitting diode substrate illustrated in FIG. 1.
5 is an exploded perspective view for schematically illustrating a backlight unit according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view illustrating a cut surface of the BB illustrated in FIG. 5.
7 is a diagram schematically illustrating a liquid crystal display according to an exemplary embodiment of the present invention.
FIG. 8 is a diagram for describing the timing controller illustrated in FIG. 7.
FIG. 9A is a diagram illustrating an image displayed on the liquid crystal display panel illustrated in FIG. 5.
FIG. 9B is a diagram for describing a method for generating block-based dimming data according to the image shown in FIG. 9A.

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

1 is an exploded perspective view for schematically illustrating a backlight unit according to a first exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating a cut plane of A-A shown in FIG. 1.

1 and 2, a backlight unit BLU according to a first embodiment of the present invention includes a light guide plate 100, a reflective member 200, and a plurality of light emitting diode substrates 300. .

The light guide plate 100 includes a base member 110, an upper pattern layer 120, and a lower pattern layer 130.

The base member 110 is formed in a flat plate shape, and the material may be made of a poly methyl methacrylate (PMMA) material.

The upper pattern layer 120 includes a plurality of lenses RL continuously formed in the first direction on the upper side of the base member 110. Here, the upper pattern layer 120 may be made of MMA (Methyl Methacrylate) material.

The plurality of lenses RL are formed convexly on the upper side of the base member 110 to have a stripe shape along the first direction parallel to the short side direction of the base member 110. In this case, each of the plurality of lenses RL may be formed to have a cross-sectional shape such as hemispherical shape or semicircle.

Meanwhile, the upper pattern layer 120 applies MMA to the entire upper side of the base member 110 made of PMMA, and bases a mold (not shown) having lens patterns (not shown) corresponding to the plurality of lenses RL. After contacting the MMA applied to the member 110, the MMA may be polymerized with PMMA to form a semi-cured PMMA, and then may be formed by fully curing the semi-cured PMMA. Such, the upper pattern layer 120 is a plurality of lenses by the same method as the manufacturing method of the optical member described in Korean Patent Application Nos. 10-2009-0041121, 10-2009-0085716 previously filed by the applicant of the present application It may be formed on the upper side of the base member 110 to include (RL).

The lower pattern layer 130 includes a plurality of inclined protrusions 132 continuously formed along the second direction crossing the first direction below the base member 110. Here, the lower pattern layer 130 may be made of MMA (Methyl Methacrylate) material.

Each of the plurality of inclined protrusions 132 protrudes from an underside of the lower pattern layer 130 to have an isosceles triangular cross section, and has a reflective surface formed to have a predetermined inclination from the underside of the lower pattern layer 130. 132a and a light incident surface 132b formed vertically from the end of the reflective surface 132a to the lower side of the lower pattern layer 130.

The light incident surface 132b is formed to face the light emitting diode substrate 300 so that light is irradiated from the light emitting diode substrate 300.

The reflective surface 132a reflects light incident from the light emitting diode substrate 300 through the light incident surface 132b toward the upper pattern layer 120.

Meanwhile, the lower pattern layer 130 applies MMA to the entire lower side of the base member 110 made of PMMA, and has a plurality of inclined concave patterns (not shown) corresponding to the plurality of inclined protrusions 132. (Not shown) may be formed by contacting the MMA applied to the base member 110, polymerizing the MMA with PMMA to form a semi-cured PMMA, and then completely curing the semi-cured PMMA. have. The lower pattern layer 130 has a plurality of inclinations by the same method as that of the optical member manufacturing method described in Korean Patent Application Nos. 10-2009-0041121 and 10-2009-0085716 filed by the applicant of the present application. It may be formed on the lower side of the base member 110 to include a shaped protrusion 132.

As such, the light guide plate 100 reflects light incident from the light emitting diode substrate 300 toward the upper pattern layer 120 by using the plurality of inclined protrusions 132 formed on the lower pattern layer 130. The light is condensed using the plurality of lenses RL formed on the pattern layer 120 to emit light having a uniform brightness over the entire surface. In this case, the luminance of the light emitted from the light guide plate 100 to the outside is collected by the plurality of lenses RL and the light reflected by the lower pattern layer 130 is emitted to the outside or totally reflected so that the lower pattern layer 130 and // Or it is uniform through the recycling reflected from the reflective member 200.

On the other hand, the light guide plate 100, as shown in Figure 3, in order to uniform the reflection efficiency of the light reflected by the lower pattern layer 130 and the brightness of the light, as shown in Figure 3, each of the reflective surface (132) A plurality of reflective patterns 134 formed on the 132a may be further included.

형태 중 어느 하나의 형태를 가지도록 반사면(132a)에 음각 또는 양각 형태로 형성될 수 있다. 이때, 복수의 반사 패턴(134)의 밀도는 반사면(132a)과 입광면(132b)에 의해 형성되는 경사형 돌출부(132)의 꼭지점으로부터 하부 패턴층(130)의 하측으로 갈수록 높아지도록 설정되는 것이 바람직하다.Each of the plurality of reflective patterns 134

It may be formed in the intaglio or embossed form on the reflective surface 132a to have any one of the forms. In this case, the densities of the plurality of reflective patterns 134 are set to increase from the vertex of the inclined protrusion 132 formed by the reflective surface 132a and the light incident surface 132b toward the lower side of the lower pattern layer 130. It is preferable.

1 and 2, the reflective member 200 includes a plurality of inclined recesses 210 formed to be concave to correspond to the plurality of inclined protrusions 132 formed on the lower pattern layer 130 of the light guide plate 100. It is formed to include. In this case, the reflective member 200 may be made of a reflective material, for example, polyethylene terephthalate (PET) material, for reflecting light incident from the light guide plate 100 toward the lower pattern layer 130.

Each of the plurality of inclined recesses 210 is formed to be concave so as to have an isosceles triangular cross section from the surface of the reflective member 200, and includes an inclined surface 212 and a vertical surface 214.

The inclined surface 212 is formed to have a predetermined inclination from the surface of the reflective member 200 to correspond to the reflective surface 132a of the inclined protrusion 132 formed on the light guide plate 100.

The vertical surface 214 is vertically formed from the end of the inclined surface 212 to the surface of the reflective member 200 so as to face the light incident surface 132b of the inclined protrusion 132 formed on the light guide plate 100.

Each of the plurality of inclined recesses 210 is inserted into each of the plurality of inclined protrusions 132 formed in the light guide plate 100.

As described above, the reflective member 200 supports the light guide plate 100 and reflects the light incident from the light guide plate 100 back toward the light guide plate 100 to minimize the loss of light.

Each of the plurality of light emitting diode substrates 300 is disposed to face the light incidence surface 132b of each of the plurality of inclined protrusions 210 formed in the light guide plate 100 so that the light may be driven by an external backlight driver (not shown). Is generated and irradiated to the light incident surface 132b. To this end, each of the plurality of light emitting diode substrates 300 includes a plurality of light emitting diodes (LEDs).

Each of the plurality of light emitting diode substrates 300 includes a vertical surface of each of the plurality of inclined recesses 210 formed in the reflective member 200 to face the light incident surface 132b of each of the plurality of inclined protrusions 132. 214). Here, the light emitting diode substrate 300 may be attached to the vertical surface 214 of each of the plurality of inclined recesses 210 by the adhesive member 310. At this time, the adhesive member 310 may be a double-sided tape.

On the other hand, the adhesive member 310 may be a double-sided tape of a metal material or a double-sided tape containing a plurality of conductive wires in order to emit heat generated when the light emitting diode (LED) emits light. The adhesive member 310 may be connected to an external case accommodating the reflective member 200 to emit heat generated from the light emitting diode substrate 300 to the external case.

As shown in FIG. 4, each of the plurality of light emitting diode substrates 300 is provided on the reflective member 200 so as to face each of the plurality of inclined protrusions 132 formed on the light guide plate 100. The light guide plate 100 is divided into a plurality of blocks LB so as to correspond to the number of the substrates 300, and light is generated by partially controlling the brightness according to simultaneous or individual control by an external backlight driver. (LB) is irradiated.

Meanwhile, the backlight unit BLU according to the first embodiment of the present invention may further include a plurality of optical sheets (not shown) for improving luminance characteristics of light emitted from the light guide plate 100.

The plurality of optical sheets may include a lower diffusion sheet, a lower prism sheet, an upper prism sheet, and an upper diffusion sheet, which are not shown.

The lower diffusion sheet is disposed on the light guide plate 100 to diffuse light incident from the light guide plate 100 and emit the light to the lower prism sheet.

The lower prism sheet is disposed on the lower diffusion sheet to collect light incident from the lower diffusion sheet in the first direction to irradiate the upper prism sheet. Here, the first direction may correspond to the long side or short side direction of the light guide plate 100.

The upper prism sheet is disposed on the lower prism sheet to focus the irradiated light incident from the lower prism sheet in the second direction to irradiate the upper diffusion sheet. Here, the second direction may be a direction orthogonal to the first direction. The upper prism sheet may be omitted according to the structure of the backlight unit BLU.

The upper diffusion sheet is disposed on the upper prism sheet to diffuse white light incident from the upper prism sheet to emit to the outside (for example, a liquid crystal display panel). In this case, when the upper prism sheet is omitted, the upper diffusion sheet may be disposed on the lower prism sheet to diffuse light incident from the lower prism sheet to emit to the outside.

The backlight unit BLU according to the first embodiment of the present invention forms a plurality of lenses on the upper side of the light guide plate 100 and a plurality of inclined protrusions 132 on the lower side of the light guide plate 100. In addition, by arranging the plurality of light emitting diode substrates 300 to face each of the plurality of inclined protrusions 132, the luminance of the light guide plate 100 may be improved and the uniformity of the luminance may be improved.

In addition, the backlight unit BLU according to the first embodiment of the present invention may reduce the overall thickness according to the slimming of the light guide plate 100 to achieve slimming.

In addition, the backlight unit BLU according to the first exemplary embodiment of the present invention divides the light guide plate 100 into a plurality of blocks so as to correspond to each of the plurality of light emitting diode substrates 300, and corresponds to each light emitting diode. By controlling the substrate 300 individually, it is possible to increase the contrast of light and dark parts, and to reduce power consumption.

FIG. 5 is an exploded perspective view for schematically illustrating a backlight unit according to a second embodiment of the present invention, and FIG. 6 is a cross-sectional view illustrating a cut surface of B-B shown in FIG. 5.

5 and 6, a backlight unit BLU according to a second embodiment of the present invention includes a light guide plate 100, a reflective member 200, and a plurality of light emitting diode substrates 300. . The backlight unit BLU of the second embodiment of the present invention having such a configuration is the same as the backlight unit BLU of the first embodiment of the present invention shown in FIGS. 1 to 4 except for the reflective member 200. Since it has a configuration, a description of the same configuration will be replaced by the above description.

The reflective member 200 may include a plurality of inclined recesses 210 formed to be concave to correspond to the plurality of inclined protrusions 132 formed on the lower pattern layer 130 of the light guide plate 100; And a plurality of substrate insertion grooves 220. In this case, the reflective member 200 may be made of a reflective material, for example, polyethylene terephthalate (PET) material, for reflecting light incident from the light guide plate 100 toward the lower pattern layer 130.

Each of the plurality of inclined recesses 210 is formed to be concave so as to have an isosceles triangular cross section from the surface of the reflecting member 200, and the reflecting surface 132a of the inclined protrusion 132 formed in the light guide plate 100. ) And a vertical surface 214 corresponding to the light incident surface 132b of the inclined protrusion 132 formed on the light guide plate 100. Each of the plurality of inclined recesses 210 is inserted into each of the plurality of inclined protrusions 132 formed in the light guide plate 100.

The plurality of substrate insertion grooves 220 are formed to be concave so as to be parallel to the vertical plane 214 from the vertical plane 214 of each inclined recess 210. A plurality of light emitting diode substrates 300 are attached to the plurality of substrate insertion grooves 220.

As described above, the reflective member 200 supports the light guide plate 100 and reflects the light incident from the light guide plate 100 back toward the light guide plate 100 to minimize the loss of light.

The backlight unit BLU according to the second embodiment of the present invention described above may provide the same effect as the backlight unit BLU of the first embodiment of the present invention described above.

In addition, the backlight unit BLU according to the second exemplary embodiment of the present invention may form the light guide plate by forming a plurality of substrate insertion grooves 220 into which the plurality of light emitting diode substrates 300 are inserted in the reflective member 200. Alignment between the plurality of inclined protrusions 132 and the light emitting diode substrate 300 formed on the light guide plate 100 may be facilitated, and the light incident surface 132b of the plurality of inclined protrusions 132 formed on the light guide plate 100 may be aligned. The boundary between the vertical surfaces 214 of the plurality of inclined recesses 210 formed in the reflective member 200 can be minimized.

7 is a diagram schematically illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 7, a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal display panel 500, a backlight unit BLU, a panel driver 600, and a backlight driver 700.

The liquid crystal display panel 500 includes a plurality of pixels P formed for each pixel area defined by the intersection of the plurality of gate lines GL and the plurality of data lines DL.

The plurality of pixels P includes a thin film transistor (not shown) connected to the gate line GL and the data line DL, and a liquid crystal cell connected to the thin film transistor.

The thin film transistor supplies a data voltage supplied from the data line DL to the liquid crystal cell in response to a gate signal supplied from the gate line GL.

The liquid crystal cell is composed of a common electrode facing each other with a liquid crystal layer interposed therebetween and a pixel electrode connected to the thin film transistor, so that the liquid crystal cell may be equivalently represented as a liquid crystal capacitor (not shown). In addition, the liquid crystal cell includes a storage capacitor (not shown) for maintaining the data voltage charged in the liquid crystal capacitor (not shown) until the next data voltage is supplied.

The liquid crystal display panel 500 forms an electric field in each pixel P by using a gate signal and a data voltage supplied from the panel driver 600 to adjust a transmittance of light emitted from the backlight unit BLU. Will display the video.

Since the backlight unit BLU has the same configuration as the backlight unit according to the first or second embodiment of the present invention illustrated in FIGS. 1 to 6, a detailed description thereof will be given with reference to FIGS. 1 to 6. I will replace it.

As shown in FIG. 1 or 5, the backlight unit BLU divides the light guide plate 100 into a plurality of blocks so as to correspond to each of the plurality of light emitting diode substrates 300, and corresponds to each block. The light emitting diode substrate 300 is individually controlled by the backlight driver 700 to irradiate light whose luminance is partially controlled to the liquid crystal display panel 500 corresponding to each block. In this case, since each of the plurality of light emitting diode substrates 300 is divided into a plurality of blocks on the rear surface of the liquid crystal display panel 500, the liquid crystal display panel 500 is divided into a plurality of display blocks, and is partially disposed on each display block. The light whose brightness is controlled is irradiated. Accordingly, the liquid crystal display panel 500 may be divided to include a plurality of display blocks corresponding to each of the plurality of light emitting diode substrates 300. For example, the liquid crystal display panel 500 may be divided into 24 (3 × 8) display blocks, but is not limited thereto. The number of display blocks may be the size of the liquid crystal display panel 500 and / or a plurality of light emission. It may vary depending on the number of diode substrates 300.

The panel driver 600 includes a timing controller 610, a gate driver 620, and a data driver 630.

As shown in FIG. 8, the timing controller 610 includes a control signal generator 612, a data processor 614, and a dimming signal generator 616.

The control signal generator 612 controls the driving timing of the gate control signal GCS and the data driving unit 630 for controlling the driving timing of the gate driver 620 using the timing synchronization signal TSS supplied from the outside. A data control signal DCS is generated.

The gate control signal GCS may be a gate start pulse, a gate shift clock, or the like.

The data control signal DCS includes a source start pulse; A source sampling clock; Source Output Enable; And a polarity control signal POL.

The data processor 614 generates the data signals R, G, and B by aligning the input data RGB supplied from the outside to be suitable for driving the liquid crystal display panel 500, and generates the generated data signals R and G. , B) is supplied to the data driver 630.

In addition, the data processor 614 analyzes a block-specific data signal to be supplied to each of the plurality of display blocks to generate block-specific dimming data BD. Here, the data processor 614 detects the gray level of the data signals to be supplied to each display block on a frame basis to generate dimming data BD for each block. In this case, the dimming data BD per block may be the largest gray level value or the average gray level value among the data signals to be supplied to each display block, but is not limited thereto.

For example, as illustrated in FIG. 9A, when the image such as sunrise is displayed on the liquid crystal display panel 500, the data processor 614 may display an image as shown in FIG. 9B. The dimming data (BD) may be generated for each block by dividing the data signal to correspond to DB) and analyzing the gray value of the data signal included in each display block. That is, the data processor 614 controls the plurality of light emitting diode substrates 300 corresponding to each display block DB according to the luminance of the data signal to be displayed on each display block DB of the liquid crystal display panel 500. Block-based dimming data BD is generated.

In FIG. 8, the dimming signal generator 616 blocks blocks for individually driving the LED substrates 300 corresponding to each display block based on the block-specific dimming data BD supplied from the data processor 614. The dimming signal BDIM is generated and the generated block-specific dimming signal BDIM is supplied to the backlight driver 700 (see FIG. 7).

In FIG. 7, the gate driver 620 generates a gate signal according to the gate control signal GCS supplied from the timing controller 610 and sequentially supplies the gate signal to the gate lines GL.

The data driver 630 latches the data signals R, G, and B input from the timing controller 610 according to the data control signal DCS supplied from the timing controller 610, and performs analog positive / negative polarity gamma. After the latched data signal is converted into a positive / negative analog data voltage using a voltage, a data voltage having a polarity corresponding to the polarity control signal POL is generated and supplied to the data lines DL.

The backlight driver 700 generates a plurality of block-specific dimming voltages Vbd corresponding to each block-specific dimming signal BDIM supplied from the timing controller 610 and supplies the same to the backlight unit BLU. That is, the backlight driver 700 is configured to emit light of the plurality of light emitting diodes (LEDs) installed in each of the plurality of light emitting diode substrates 300 based on each of the block-specific dimming signals BDIM corresponding to the display block DB. The dimming voltage Vbd for each block is generated and supplied to each of the plurality of light emitting diode substrates 300. Accordingly, the backlight unit BLU partially controls the luminance so as to correspond to an image by emitting each of a plurality of light emitting diodes LED installed on each of the plurality of light emitting diode substrates 300 according to the dimming voltage Vbd for each block. The light is irradiated onto the liquid crystal display panel 500.

As described above, the liquid crystal display according to the exemplary embodiment of the present invention generates dimming data for each block by analyzing input data to be displayed on the liquid crystal display panel 500 divided into a plurality of display blocks for each display block, and for each generated block. By performing local dimming of the backlight unit BLU based on the dimming data, partial luminance of the image may be improved to improve brightness contrast and reduce power consumption.

In addition, since the liquid crystal display according to the exemplary embodiment of the present invention includes the backlight unit BLU according to the first or second exemplary embodiment of the present invention, the overall thickness is reduced to achieve slimming.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

100: light guide plate 110: base member
120: upper pattern layer 130: lower pattern layer
132: inclined protrusion 134: reflection pattern
200: reflection member 210: inclined recess
220: substrate insertion groove 300: light emitting diode substrate
500: liquid crystal display panel 600: panel driver
610: timing controller 620: gate driver
630: data driver 700: backlight driver

Claims (12)

A base pattern layer, an upper pattern layer having a plurality of lenses continuously formed in a first direction on an upper side of the base member, and a plurality of continuously formed in a second direction crossing the first direction on a lower side of the base member A light guide plate including a lower pattern layer having an inclined protrusion;
A reflection member having a plurality of inclined recesses formed concave to correspond to the plurality of inclined protrusions; And
And a plurality of light emitting diode substrates disposed on the plurality of inclined recesses to irradiate light to each of the plurality of inclined protrusions. The method of claim 1,
Each of the plurality of inclined protrusions,
A reflective surface protruding from the lower side of the lower pattern layer to be inclined at a predetermined slope; And
And a light incident surface formed vertically from the end of the reflective surface to the lower side of the lower pattern layer. The method of claim 2,
The light guide plate further comprises a plurality of reflective patterns formed on the reflective surface of each of the plurality of inclined protrusions. The method of claim 3, wherein
And a density of the plurality of reflective patterns increases from a vertex formed by the reflective surface and the light incident surface of the inclined protrusion toward the lower side of the lower pattern layer. The method of claim 3, wherein
Each of the plurality of reflective patterns

The backlight unit, characterized in that the inclined or embossed on the reflective surface to have any one of the forms. The method of claim 3, wherein
Each of the plurality of inclined concave portions is concave to include an inclined surface formed to face the reflecting surface so that each of the plurality of inclined protrusions can be inserted therein and a vertical surface on which the light emitting diode substrate is installed. Back light unit, characterized in that formed. The method according to claim 6,
And the reflecting member further comprises a plurality of substrate insertion grooves formed on a vertical surface of each of the plurality of inclined recesses to install the light emitting diode substrate. The method of claim 1,
The base member is made of a poly methyl methacrylate (PMMA) material,
The upper pattern layer and the lower pattern layer is a backlight unit, characterized in that made of MMA (Methyl Methacrylate) material. A liquid crystal display panel which displays an image by adjusting light transmittance;
A backlight unit according to any one of claims 1 to 8, wherein the liquid crystal display panel is irradiated with light;
A backlight driver driving each of the plurality of light emitting diode substrates; And
And a panel driver for driving the liquid crystal display panel and controlling the backlight driver. The method of claim 9,
And the liquid crystal display panel divides and displays the image into a plurality of display blocks so as to correspond to each of the plurality of light emitting diode substrates. The method of claim 10,
The panel driver may include a timing controller configured to analyze data signals to be supplied to the plurality of display blocks, generate a dimming signal for each block corresponding to each of the display blocks, and provide the dimming signal to the backlight driver. Display device. The method of claim 11,
And the backlight driver individually controls driving of each of the plurality of light emitting diode substrates based on the dimming signal for each block provided from the timing controller.

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