KR100505182B1 - Structure of backlignt unit for liquid crystal display - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight structure of a liquid crystal display device, wherein an image display unit is divided into a plurality of blocks and driven in a time-division manner, wherein a boundary surface of a plurality of divided blocks of the liquid crystal display panel is formed on a rear surface of the light guide plate. And a groove-shaped boundary portion, a reflecting plate is provided along the back curve of the light guide plate, and a prism sheet is provided between the liquid crystal display panel and the light guide plate. When blue is sequentially displayed, light can be prevented from leaking to adjacent blocks.

Description

Backlight structure of liquid crystal display {STRUCTURE OF BACKLIGNT UNIT FOR LIQUID CRYSTAL DISPLAY}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight structure of a liquid crystal display device, and more particularly, to a backlight structure of a liquid crystal display device suitable for improving contrast of a field-sequential liquid crystal display panel.

In general, cathode ray tube (CRT), one of the widely used display devices, is mainly used for monitors such as televisions, measuring instruments, information terminal devices, etc. Could not respond actively to the demand for miniaturization and weight reduction.

Accordingly, liquid crystal displays having advantages of small size, light weight, and low power consumption have been actively developed in order to replace the cathode ray tube, and recently, the liquid crystal display has been developed enough to perform a role as a flat panel display, and the demand continues to increase. It is becoming.

The driving principle of the liquid crystal display device uses the optical anisotropy and polarization of the liquid crystal. In this case, since the liquid crystal has a long axis and a short axis in the shape of a round bar, the liquid crystal has directivity in the molecular arrangement, and the direction of the molecular array can be controlled by artificially applying an electric field to the liquid crystal.

Accordingly, when the molecular alignment direction of the liquid crystal is arbitrarily adjusted, light supplied from the back-light provided on the rear surface of the liquid crystal display panel is selectively transmitted or blocked according to the molecular arrangement direction of the liquid crystal. It can be applied to implement an image. Such a liquid crystal display will be described in detail with reference to the accompanying drawings.

1 is an exemplary view showing a schematic cross-sectional configuration of a general liquid crystal display.

Referring to FIG. 1, the liquid crystal display device 10 may include a first substrate 20 and a second substrate 40 bonded to each other so as to have a predetermined distance from each other; A liquid crystal layer 30 formed at a distance between the first substrate 20 and the second substrate 40; The back-light is disposed on the rear surface of the second substrate 40 and supplies light to the liquid crystal display panel 15 including the first substrate 20, the second substrate 40, and the liquid crystal layer 30. backlight, 50).

The lower surface of the transparent substrate 21 of the first substrate 20 is provided with a black matrix 22 formed of a material that blocks light in the form of a net along the outer edges of the pixels in order to partition pixels through which light passes. On the bottom surface of the transparent substrate 21 on which the matrix 22 is formed, red, green, and blue color filters 23 are provided so that light transmitted from the pixels may have red, green, and blue colors.

A lower portion of the color filter 23 is provided with a transparent common electrode 24, which is one electrode that applies an electric field to the liquid crystal layer 30.

On the other hand, a thin film transistor (TFT) to the switching role on the transparent substrate 41 of the first substrate 40; A transparent pixel electrode 42 is provided to receive a signal from the thin film transistor TFT and apply an electric field to the liquid crystal layer 30 together with the transparent common electrode 24.

Although not shown in detail in the drawings, a plurality of gate lines are horizontally arranged on the upper portion of the transparent substrate 41 of the second substrate 40 at regular intervals; A plurality of data lines arranged vertically apart and vertically intersect, pixels are defined and arranged in a matrix in a rectangular area where the gate lines and the data lines intersect, and the pixel electrode 42 is individually arranged in the pixels. It is provided with.

The thin film transistor TFT may include a gate electrode in electrical contact with the gate lines; A source electrode in electrical contact with the data lines; A drain electrode in electrical contact with the pixel electrode 42 is provided.

However, the general liquid crystal display as described above has the following problems.

First, since the transmittance of light transmitted through the color filter 23 is about 33% at maximum, the loss of light is large. Therefore, in order to improve the brightness of the liquid crystal display, the light generated from the back light 50 must be brightened, and thus the power consumption is very large.

In addition, since the color filter 23 is very expensive compared to other materials, the color filter 23 increases the manufacturing cost of the liquid crystal display.

In order to solve the above problems, a time-division liquid crystal display device capable of realizing full color without applying the color filter 23 has been proposed.

In general, the back-light of the liquid crystal display is a method of supplying white light when the liquid crystal display is turned on while the liquid crystal display is driven, but the time-division type liquid crystal display is red, green, and green for one frame. The red, green, and blue light sources are turned on at regular time intervals through a back light having blue light, thereby displaying a color image.

2 is an exemplary view showing a schematic cross-sectional configuration of the time-division liquid crystal display.

Referring to FIG. 2, a general time-division type liquid crystal display device 60 includes: a first substrate 70 and a second substrate 90 joined to face each other to have a predetermined spacing interval; A liquid crystal layer 80 formed at a distance between the first substrate 70 and the second substrate 90; Red, green, and blue light is emitted to the liquid crystal display panel 65 disposed on the rear surface of the second substrate 90 and composed of the first substrate 70, the second substrate 90, and the liquid crystal layer 80. It is composed of red (R), green (G), blue (B) back-light 100 to supply.

The lower surface of the transparent substrate 71 of the first substrate 70 is provided with a black matrix 72 formed of a material that blocks the light of the net shape along the outer edge of the pixels in order to partition the pixels through which the light is transmitted.

The lower surface of the transparent substrate 71 on which the black matrix 72 is formed is provided with a transparent common electrode 73 which is one electrode that applies an electric field to the liquid crystal layer 80.

On the other hand, a thin film transistor (TFT) to the switching role on the transparent substrate 91 of the second substrate 90; A transparent pixel electrode 92 is provided to receive a signal from the thin film transistor TFT and apply an electric field to the liquid crystal layer 80 together with the transparent common electrode 73.

Although not shown in detail in the drawings, a plurality of gate lines are horizontally arranged on the transparent substrate 91 of the second substrate 90 and are arranged laterally; A plurality of data lines that are vertically spaced apart and vertically intersect, pixels are defined and arranged in a matrix in a rectangular region where the gate lines and the data lines intersect, and the pixel electrode 92 is individually arranged in the pixels. It is provided with.

The thin film transistor TFT may include a gate electrode in electrical contact with the gate lines; A source electrode in electrical contact with the data lines; A drain electrode in electrical contact with the pixel electrode 92 is provided.

The most distinctive feature of the time-division type liquid crystal display device 60 is distinguished from a general liquid crystal display device is that a color filter is not required, and red (R) of a method of individually lighting red, green, and blue light sources, Green (G), blue (B) back-light 100 is to be applied.

The red (R), green (G), and blue (B) back-lights 100 turn on red, green, and blue light sources 60 times a second for a total of 180 times by an inverter (not shown). By flashing, colors are expressed by mixing red, green, and blue through the afterimage effect of vision.

The red, green, and blue light sources flash 180 times per second, but the actual human view recognizes that the red, green, and blue light sources are all turned on.

For example, when the red light source is turned on first, and then the blue light source is turned on, the phenomenon which appears purple due to the afterimage effect of vision is applied.

As described above, the time-division liquid crystal display device overcomes the problem of deterioration in luminance of a general liquid crystal display device to which a color filter is applied, and applies full-color by applying a back light having red, green, and blue light sources. Since it can be implemented, by having a high brightness and contrast characteristics, by providing a liquid crystal display panel with reduced manufacturing cost, it has the advantage that can be applied very effectively to the production of large area liquid crystal display device.

FIG. 3 is an exemplary view briefly illustrating a structure of a substrate on which a thin film transistor is manufactured in order to explain driving of the time-division liquid crystal display.

Referring to FIG. 3, a plurality of gate lines 101 regularly spaced apart from each other and horizontally arranged and a plurality of data lines 102 arranged in columns spaced apart from each other cross each other, and the gate lines 101 and the data intersect. The unit pixel is defined in a rectangular region where lines 102 intersect each other.

The thin film transistor TFT is disposed near the intersection point of the gate lines 101 and the data lines 102 of the unit pixel, and the thin film transistor TFT is electrically connected to the unit pixel region except for the thin film transistor TFT. The pixel electrode 103 in contact with the second electrode is provided.

A typical liquid crystal display device is driven by applying image information to the data lines 102 and scanning pulse signals on the gate lines 101.

That is, the liquid crystal display is driven by gate pulse voltages selectively applied to the gate lines 101, and the gate pulse voltages are sequentially applied in a unit of one gate line 101 by the gate driver. When applied by the driving method and the gate pulse voltage is applied to all the gate lines 101, one image frame is completed.

That is, when a gate pulse voltage is applied to the N-th gate line 101, all the thin film transistors TFTs electrically contacting the N-th gate line 101 are turned on at the same time, and the turn- Image information of the data lines 102 is applied to the pixel electrode 103 through the turned on TFTs.

When the image information is applied to the pixel electrode 103, an electric field is applied to the liquid crystal layer together with a common electrode formed on another substrate and applied with a common voltage, and the image information is provided in the unit pixel to Accumulate in a capacitor (not shown) in electrical contact.

When an electric field is applied to the liquid crystal layer, the alignment direction of the liquid crystal molecules in the liquid crystal layer is changed, and at this time, the red, green, and blue light sources are sequentially turned on in the back-light so that the liquid crystal molecules of the red, green, and blue colors are changed according to the alignment direction. By selectively transmitting light, color images can be realized.

That is, the back light is turned on once for each of red, green, and blue light sources for one frame in the entire driving region of the liquid crystal display panel.

As described above, the time-division liquid crystal display panel driving method sequentially scans the gate pulse voltages on the gate lines of the entire driving region of the liquid crystal display panel for a predetermined time of one frame, and transmits image information in the unit of gate lines through the data lines. The thin film transistor scan section for supplying the light emitting diode, the liquid crystal response section in which the liquid crystal molecules of the liquid crystal layer are rearranged, and the flashing section in which the back light is turned on are separately required for the red, green, and blue light sources.

However, when the liquid crystal display device has a high resolution and a large area, the number of the gate lines increases gradually.

Therefore, the thin film transistor scan section is gradually longer, and the time of one frame is fixed, and as a result, the liquid crystal response section or the flashing section should be gradually shortened. When it reaches | attains, it will be in the state which cannot express a favorable image.

Accordingly, a deviated display area method (DDAM) for dividing the screen of the liquid crystal display has been proposed.

4 is an exemplary diagram illustrating an example of screen division of the time-division type liquid crystal display.

4, a liquid crystal display panel 110 including a first substrate and a second substrate to be opposed to each other, and a liquid crystal layer formed between the first substrate and the second substrate; A back light 120 supplying red, green and blue light sources to the liquid crystal display panel 110; The control unit 130 for controlling the lighting of the red, green and blue light sources of the back-light 120 is shown.

The liquid crystal display panel 110 is divided into four blocks 110A to 110D.

The back light 120 includes a light guide plate 121 provided corresponding to the entire rear surface of the liquid crystal display panel 110 and a light source unit generating red, green, and blue light provided on one side of the light guide plate 121. 122 is provided.

The light source unit 122 is divided into four blocks 122A to 122D for supplying red, green, and blue light to the four blocks 110A to 110D of the liquid crystal display panel 110, respectively.

However, in the conventional time-division type liquid crystal display, four blocks 110A to 110D of the liquid crystal display panel 110 are sequentially driven as the screen division driving is performed, and four blocks of the light source unit 122 corresponding thereto ( Since red, green, and blue light sources are supplied from 122A to 122D, the second block 110B of the liquid crystal display panel 110 is driven, for example, as shown in the example of FIG. When the light sources of red, green, and blue light is supplied from the second block 122B of 122 to the second block 110B of the liquid crystal display panel 110 through the light guide plate 121, the second light source unit 122 may be used. The red, green, and blue light sources supplied from the block 122B leak to adjacent first and third blocks 110A and 110C of the liquid crystal display panel 110, thereby reducing contrast, thereby causing liquid crystals. There was a problem that the image quality of the display device is degraded.

Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to improve contrast by preventing leakage of light sources in adjacent blocks of a screen-divided time-division type liquid crystal display. It is to provide a backlight structure of the liquid crystal display device.

According to an aspect of the present invention, there is provided a backlight structure of a liquid crystal display device comprising: a liquid crystal display panel in which a screen is divided into a plurality of blocks; A light guide plate provided on a rear surface of the liquid crystal display panel and having a groove-shaped boundary portion corresponding to a boundary surface in which a plurality of blocks of the liquid crystal display panel are divided; A reflection plate formed on a rear surface of the light guide plate including the groove-shaped boundary portion; A plurality of light source parts provided on at least one side of the light guide plate and partitioned to correspond to the plurality of divided blocks of the liquid crystal display panel by boundary portions of the light guide plate to supply red, green, and blue light, respectively; And a control unit for controlling the lighting of the plurality of light source units.

Hereinafter, a backlight structure of a liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

6 is an exemplary view showing a time-division type liquid crystal display device according to a first embodiment of the present invention, and FIG. 7 is an exemplary view showing a cross-sectional configuration thereof.

6 and 7, in the time-division type liquid crystal display according to the first embodiment of the present invention, a liquid crystal layer formed between opposingly bonded first and second substrates and the first and second substrates. A liquid crystal display panel 210 configured to include; First to fourth blocks 210A to 210D for dividing the liquid crystal display panel 210 into a plurality of regions; In the rear surface of the liquid crystal display panel 210, groove-shaped boundary portions 221A to 221D corresponding to the boundary surfaces of the first to fourth blocks 210A to 210D of the liquid crystal display panel 210 are provided on the rear surface. A light guide plate 221; A prism sheet 240 disposed between the liquid crystal display panel 210 and the light guide plate 221; A reflecting plate 223 formed along a rear curve of the light guide plate 221; It is provided on one side of the light guide plate 221 and is partitioned to correspond to the first to fourth blocks 210A to 210D of the liquid crystal display panel 210 by the boundary portions 221A to 221D of the light guide plate 221. First to fourth light source portions 222A to 222D for supplying red, green, and blue light; And a control unit 230 for outputting a control signal to the first to fourth light source units 222A to 222D to control lighting of the red, green, and blue light sources.

Here, the liquid crystal display panel 210 is divided into first to fourth blocks 210A to 210D. However, the liquid crystal display panel 210 may be divided into an appropriate number in consideration of the area of the image display unit, the liquid crystal response time, and the resolution of the liquid crystal display panel 210. Can be.

In addition, the liquid crystal layer may be a ferroelectric liquid crystal, an optically compensated birefringent (OCB), a twisted nematic (TN), or the like having high-speed response characteristics.

The first to fourth light source parts 222A to 222D are provided on one side surface of the light guide plate 221, but may be provided on both side surfaces of the light guide plate 221, and the light source units facing each other may be disposed on the control unit 230. It is desirable to be driven at the same time.

The reflective plate 223 is a material that reflects light, for example, preferably formed of aluminum.

In the time-division type liquid crystal display according to the first exemplary embodiment of the present invention, the first to fourth blocks 210A to 210D of the liquid crystal display panel 210 are sequentially driven and output from the controller 230. The red, green, and blue light is turned on from one of the first to fourth light source parts 222A to 222D by the signal, and thus the first to fourth blocks 210A to 210D of the liquid crystal display panel 210 through the light guide plate 221. Is supplied to the corresponding one of the blocks.

The backlight structure of the time-division type liquid crystal display according to the first embodiment of the present invention corresponds to the boundary surface of the first to fourth blocks 210A to 210D of the liquid crystal display panel 210 on the rear surface of the light guide plate 221. As the groove-shaped boundary portions 221A to 221D are provided and the reflecting plate 223 is provided along the back curve of the light guide plate 221, the liquid crystal display panel 210 is formed from one of the first to fourth light source portions 222A to 222D. In the corresponding blocks in the first to fourth blocks 210A to 210D, red, green and blue are adjacent blocks of the liquid crystal display panel 210 when light of red, green, and blue is supplied through the light guide plate 221. And blue light can be prevented from leaking.

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In addition, in the backlight structure of the time-division type liquid crystal display according to the first exemplary embodiment of the present invention, the prism sheet 240 is further provided between the liquid crystal display panel 210 and the light guide plate 221. Red, green, and blue light is supplied through the light guide plate 221 from one of the fourth light source portions 222A to 222D to a corresponding block of the first to fourth blocks 210A to 210D of the liquid crystal display panel 210. In this case, the red, green, and blue light incident to the adjacent blocks of the liquid crystal display panel 210 are vertically refracted to collect light, thereby effectively preventing light from leaking to the adjacent blocks of the liquid crystal display panel 210. You can do it.

FIG. 8 is an exemplary view showing a time chart of a driving method of a screen-divided time-division liquid crystal display according to a first embodiment of the present invention. Referring to FIGS. 6, 7 and 8 described above. The driving of the screen-divided time-division liquid crystal display panel according to the first embodiment of the present invention will be described in detail as follows.

First, in order to drive the first block 210A of the liquid crystal display panel 210, the gate is sequentially gated to the gate lines of the first block 210A of the liquid crystal display panel 210 during the thin film transistor scan period TFT-SCAN1. Image information is supplied in units of gate lines through data lines while scanning a pulse voltage.

Therefore, the liquid crystal molecules of the first block 210A of the liquid crystal display panel 210 to which the image information is supplied in the thin film transistor scan period TFT-SCAN1 are rearranged during the liquid crystal response period LC-RESPONSE1.

When the liquid crystal molecules are rearranged during the liquid crystal response section LC-RESPONSE1, the red light source is turned on in the first light source unit 222A by the control signal applied from the controller 230, thereby the liquid crystal display panel 210. Red is displayed during the red flashing section RED-FLASHING1 in the first block 210A.

After displaying red on the first block 210A of the liquid crystal display panel 210, the thin film transistor scan section TFT-SCAN1 and the liquid crystal response section LC-RESPONSE1 are performed in the same manner, and the controller 230 The green light source is turned on in the first light source unit 222A according to a control signal applied from the first light source unit 222A, thereby displaying green color during the green flashing period GREEN-FLASHING1 in the first block 210A of the liquid crystal display panel 210.

In addition, after the green color is displayed on the first block 210A of the liquid crystal display panel 210, the thin film transistor scan section TFT-SCAN1 and the liquid crystal response section LC-RESPONSE1 are performed in the same manner. The blue light source is turned on in the first light source unit 222A by the control signal applied from 230, thereby displaying blue color during the blue flashing period BLUE-FLASHING1 in the first block 210A of the liquid crystal display panel 210.

In this case, as described above, the backlight structure of the time-division type liquid crystal display according to the first exemplary embodiment of the present invention includes the first to fourth blocks 210A to 210D of the liquid crystal display panel 210 on the rear surface of the light guide plate 221. Groove-shaped boundary portions 221A to 221D corresponding to the boundary surface of the plurality of light emitting diodes, and a reflecting plate 223 is provided along the rear surface curvature of the light guide plate 221, and the liquid crystal display panel 210 and the light guide plate 221 are provided. As the prism sheet 240 is provided between the second blocks 210B of the liquid crystal display panel 210 when red, green, and blue colors are sequentially displayed on the first block 210A of the liquid crystal display panel 210. ), Red, green, and blue light can be prevented from leaking.

On the other hand, the thin film transistor scan section TFT-SCAN2 of the second block 210B of the liquid crystal display panel 210 is the thin film transistor scan section TFT-SCAN1 of the first block 210A of the liquid crystal display panel 210. At the end of).

Accordingly, the liquid crystal response section LC-RESPONSE2 and the red, green, and blue flashing sections RED-FLASHING2, GREEN-FLASHING2, and BLUE-FLASHING2 of the second block 210B of the liquid crystal display panel 210 also have a thin film transistor scan section. In response to the TFT-SCAN2, the liquid crystal response section LC-RESPONSE1 of the first block 210A of the liquid crystal display panel 210 and the red, green, and blue flashing sections RED-FLASHING1, GREEN-FLASHING1, and BLUE-FLASHING1 ) And the red, green, and blue light sources are sequentially turned on during the red, green, and blue flashing sections RED-FLASHING2, GREEN-FLASHING2, and BLUE-FLASHING2 in the second light source unit 222B. Red, green, and blue colors are displayed on the second block 210B of the display panel 210.

In this case, as described above, the backlight structure of the time-division type liquid crystal display according to the first exemplary embodiment of the present invention includes the first to fourth blocks 210A to 210D of the liquid crystal display panel 210 on the rear surface of the light guide plate 221. Groove-shaped boundary portions 221A to 221D corresponding to the boundary surface of the plurality of light emitting diodes, and a reflecting plate 223 is provided along the rear surface curvature of the light guide plate 221, and the liquid crystal display panel 210 and the light guide plate 221 are provided. As the prism sheet 240 is provided between the first and third portions of the liquid crystal display panel 210 when red, green, and blue colors are sequentially displayed on the second block 210B of the liquid crystal display panel 210. Blocks 210A and 210C can be prevented from leaking red, green and blue light.

On the other hand, the thin film transistor scan section TFT-SCAN3 of the third block 210C of the liquid crystal display panel 210 is the thin film transistor scan section TFT-SCAN2 of the second block 210B of the liquid crystal display panel 210. ) And the thin film transistor scan section TFT-SCAN4 of the fourth block 210D of the liquid crystal display panel 210 scans the thin film transistor of the third block 210C of the liquid crystal display panel 210. It starts when the section TFT-SCAN3 ends.

Accordingly, the liquid crystal response section LC-RESPONSE3 and the red, green, and blue flashing sections RED-FLASHING3, GREEN-FLASHING3, and BLUE-FLASHING3 of the third block 210C of the liquid crystal display panel 210 also have a thin film transistor scan section. In response to the TFT-SCAN3, the liquid crystal response section LC-RESPONSE2 of the second block 210B of the liquid crystal display panel 210 and the red, green, and blue flashing sections RED-FLASHING2, GREEN-FLASHING2, and BLUE-FLASHING2 ) And the red, green, and blue light sources are sequentially turned on during the red, green, and blue flashing sections (RED-FLASHING3, GREEN-FLASHING3, and BLUE-FLASHING3) in the third light source unit 222C. Red, green, and blue colors are displayed on the third block 210C of the display panel 210.

In this case, as described above, the backlight structure of the time-division type liquid crystal display according to the first exemplary embodiment of the present invention includes the first to fourth blocks 210A to 210D of the liquid crystal display panel 210 on the rear surface of the light guide plate 221. Groove-shaped boundary portions 221A to 221D corresponding to the boundary surface of the plurality of light emitting diodes, and a reflecting plate 223 is provided along the rear surface curvature of the light guide plate 221, and the liquid crystal display panel 210 and the light guide plate 221 are provided. As the prism sheet 240 is provided between the second and fourth portions of the liquid crystal display panel 210 when red, green, and blue colors are sequentially displayed on the third block 210C of the liquid crystal display panel 210. Blocks 210B and 210D can prevent red, green and blue light from leaking.

In addition, the liquid crystal response section LC-RESPONSE4 and the red, green, and blue flashing sections RED-FLASHING4, GREEN-FLASHING4, and BLUE-FLASHING4 of the fourth block 210D of the liquid crystal display panel 210 are also thin film transistor scan sections. In response to the TFT-SCAN4, the liquid crystal response section LC-RESPONSE3 and the red, green and blue flashing sections RED-FLASHING3, GREEN-FLASHING3, and BLUE-FLASHING3 of the third block 210C of the liquid crystal display panel 210 are ) And the red, green, and blue light sources are sequentially turned on during the red, green, and blue flashing sections RED-FLASHING4, GREEN-FLASHING4, and BLUE-FLASHING4 in the fourth light source unit 222D. Red, green, and blue colors are displayed on the fourth block 210D of the display panel 210.

In this case, as described above, the backlight structure of the time-division type liquid crystal display according to the first exemplary embodiment of the present invention includes the first to fourth blocks 210A to 210D of the liquid crystal display panel 210 on the rear surface of the light guide plate 221. Groove-shaped boundary portions 221A to 221D corresponding to the boundary surface of the plurality of light emitting diodes, and a reflecting plate 223 is provided along the rear surface curvature of the light guide plate 221, and the liquid crystal display panel 210 and the light guide plate 221 are provided. As the prism sheet 240 is disposed between the third blocks 210C of the liquid crystal display panel 210 when red, green, and blue colors are sequentially displayed on the fourth block 210D of the liquid crystal display panel 210. ), Red, green, and blue light can be prevented from leaking.

As described above, according to the backlight structure of the liquid crystal display according to the present invention, in the liquid crystal display device in which the image display unit is divided into a plurality of blocks and driven in a time-division manner, the liquid crystal display panel is divided on the rear surface of the light guide plate. Groove-shaped boundary portions corresponding to the boundary surfaces of the plurality of blocks are provided, a reflecting plate is provided along the back curve of the light guide plate, and a prism sheet is provided between the liquid crystal display panel and the light guide plate to drive the liquid crystal display panel. When red, green and blue are sequentially displayed in the block, it is possible to prevent light from leaking to adjacent blocks.

Therefore, it is possible to improve the contrast of the liquid crystal display which is divided into a plurality of blocks and driven in a time-division manner, thereby improving the image quality.

1 is an exemplary view showing a schematic cross-sectional configuration of a general liquid crystal display.

2 is a schematic cross-sectional view of a time-division liquid crystal display.

FIG. 3 is an exemplary view schematically illustrating the structure of a substrate on which a thin film transistor of a time-division type liquid crystal display device is manufactured.

4 is an exemplary view showing an example of screen division of a time-division liquid crystal display;

FIG. 5 is an exemplary view illustrating a phenomenon in which light of the screen-divided time-division liquid crystal display panel leaks in FIG. 4; FIG.

6 is an exemplary view showing a backlight structure of a liquid crystal display according to a first embodiment of the present invention.

7 is an exemplary view showing a cross-sectional structure of a backlight structure of a liquid crystal display according to a first embodiment of the present invention.

8 is an exemplary view showing a time chart of a driving method of a screen-divided time-division liquid crystal display panel according to the present invention;

*** Explanation of symbols for main parts of drawing ***

210: liquid crystal display panels 210A to 210D: first to fourth blocks

221: Light guide plate 221A to 221D: First to fourth boundary parts

222A to 222D: first to fourth light source portions 223: reflector plate

230: control unit 240: prism sheet

Claims (6)

A liquid crystal display panel in which a screen is divided into a plurality of blocks; A light guide plate provided on a rear surface of the liquid crystal display panel and having a groove-shaped boundary portion corresponding to a boundary surface in which a plurality of blocks of the liquid crystal display panel are divided; A reflection plate formed on a rear surface of the light guide plate including the groove-shaped boundary portion; A plurality of light source units provided on at least one side of the light guide plate and partitioned to correspond to the plurality of divided blocks of the liquid crystal display panel by boundary portions of the light guide plate to supply red, green, and blue light, respectively; And And a control unit for controlling the lighting of the plurality of light source units. The backlight structure of claim 1, wherein the plurality of light sources are provided on both side surfaces of the light guide plate. The backlight structure of the liquid crystal display device of claim 2, wherein a plurality of light source units provided on both side surfaces of the light guide plate are simultaneously driven to face each other. The backlight structure of a liquid crystal display device according to claim 1, further comprising a prism sheet between the liquid crystal display panel and the light guide plate. The backlight structure of claim 1, wherein the reflector is made of aluminum. The liquid crystal display of claim 1, wherein the number of blocks for dividing the image display unit of the liquid crystal display panel into a plurality of areas is determined in consideration of at least one of an area of the image display unit, a liquid crystal response time, and a resolution. Backlight structure of the device.