KR101291938B1 - Backlight assembly and liquid crystal display device having the same - Google Patents

Backlight assembly and liquid crystal display device having the same Download PDF

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Publication number
KR101291938B1
KR101291938B1 KR1020050135084A KR20050135084A KR101291938B1 KR 101291938 B1 KR101291938 B1 KR 101291938B1 KR 1020050135084 A KR1020050135084 A KR 1020050135084A KR 20050135084 A KR20050135084 A KR 20050135084A KR 101291938 B1 KR101291938 B1 KR 101291938B1
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KR
South Korea
Prior art keywords
light
compensation plate
formed
disposed
pattern
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KR1020050135084A
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Korean (ko)
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KR20070071541A (en
Inventor
이성근
김재범
김재진
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엘지디스플레이 주식회사
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Publication of KR20070071541A publication Critical patent/KR20070071541A/en
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Abstract

The present invention provides a backlight assembly and a liquid crystal display device having the same to improve color mixing and light efficiency. The disclosed backlight assembly includes a light emitting diode disposed at predetermined intervals to emit light and a light compensation plate disposed on the light emitting diode.
Light correction plate, round pattern, pyramid pattern, prism pattern

Description

BACKLIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

Figure 1a is a perspective view showing a conventional direct type liquid crystal display device.

FIG. 1B is a cross-sectional view taken along the line II ′ of FIG. 1A; FIG.

2A is an exploded perspective view showing a direct type liquid crystal display device according to a first embodiment of the present invention;

FIG. 2B is a cross-sectional view taken along the line II-II 'of FIG. 2A;

Figure 3a is a perspective view showing the front of the light compensation plate according to the present invention.

Figure 3b and Figure 3c is a perspective view showing the back of the light compensation plate according to the present invention.

4 is a view showing an optical path of region A of FIG. 2B according to the first embodiment of the present invention;

5A to 5C are cross-sectional views showing light compensation plates according to the second to fourth embodiments of the present invention.

Description of the Related Art [0002]

110: liquid crystal panel 111: top case

120: backlight assembly 130: optical sheet

150: light emitting diode 151: red (R) light emitting diode

152: green (G) light emitting diode 153: blue (B) light emitting diode

160: printed circuit board 170: reflecting plate

180: bottom case 190: support main

200: light compensation plate 210: round pattern

220, 220a: Pyramid Pattern 220b: Prism Pattern

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight assembly, and more particularly, to a backlight assembly for improving color mixing and light efficiency and a liquid crystal display device having the same.

CRT (Cathode Ray Tube), which is one of the widely used display devices, is mainly used for monitors such as TVs, measuring instruments, information terminals, etc. However, due to the weight and size of the CRT itself, Could not respond positively to the response of

To replace such CRTs, liquid crystal displays have been actively developed, which have advantages of small size, light weight, and low power consumption.

The LCD has a large contrast ratio, a moving image display, and low power consumption. Therefore, the LCD has been expanded as an alternative means to overcome the disadvantages of the CRT.

However, since the liquid crystal display itself is non-luminescent, a separate external light source for irradiating light is required. Accordingly, a backlight assembly for irradiating light to the liquid crystal panel has been proposed.

The backlight assembly is classified into an edge type and a direct type according to the position of the light source with respect to the display surface. Among these, the direct type backlight assembly is widely used in a large liquid crystal display device of 30 inches or more because of its excellent light efficiency and easy handling, and thus there is no limitation on the size of the display surface.

The direct backlight assembly is inexpensive because it does not require a light guide plate for converting the light of the light source into surface light.

Hereinafter, a direct backlight assembly according to the related art will be described in detail with reference to the accompanying drawings.

FIG. 1A is a perspective view illustrating a conventional direct type liquid crystal display, and FIG. 1B is a cross-sectional view taken along the line II ′ of FIG. 1A.

As shown in FIGS. 1A and 1B, a conventional direct type liquid crystal display device includes a liquid crystal panel 10 displaying an image, a top case 11 protecting the liquid crystal panel 10, and supplying light. And a backlight assembly 20.

The backlight assembly 20 may include a bottom case 80, light emitting diodes (LEDs) disposed at predetermined intervals on the bottom case 80 to emit light, and the light emitting diodes ( The printed circuit board 60 for supplying power to the power supply 50, the optical sheet 30 for diffusing and condensing the light generated by the light emitting diode 50, and the liquid crystal panel 10 are fixedly supported. It is configured to include a support main 90 fixed to the bottom case (80).

The light emitting diode 50 includes a red light emitting diode emitting red light, a green light emitting diode emitting green light, and a blue light emitting diode emitting blue light.

The light emitting diode 50 is provided with a side type light emitting diode 50 which is advantageous in stabilizing luminance by mixing light evenly.

The light generated from the red (R), green (G) and blue (B) light emitting diodes 50 is mixed with each other and emits as white (W) light.

The optical sheet 30 includes a diffusion sheet 31 for diffusing light, a light collecting sheet 32 for collecting light, and a protective sheet 33 for protecting the light collecting sheet 32.

The diffusion sheet 31 includes a haze, and the haze diffuses the light to improve the uniformity of the light.

The haze of the diffusion sheet 31 has an advantage of diffusing light, but the light efficiency may be lowered by increasing the amount of light reflected and lost by the haze according to the amount of haze.

The light generated from the red (R), green (G) and blue (B) light emitting diodes 50 is irradiated to the liquid crystal panel 10 through the optical sheets 30 while being mixed with each other.

However, in the conventional direct type liquid crystal display device described above, light is generated on the side of the light emitting diodes 50 of red (R), green (G), and blue (B), whereby red (R), green (G) and In order for blue (B) light to be mixed and emitted as white light, a distance L1 between the light emitting diode 50 and the optical sheet 30 is to be provided. The gap L1 causes difficulty in slimming the liquid crystal display device and causes light loss.

In addition, the light path of the light emitting diodes 50 is in a lateral direction directly under the liquid crystal panel 10. As a result, the luminance unevenness of the edge region is relatively higher than that of the center region of the liquid crystal panel 10, and the light emitted from the side surface is lost while being reflected and refracted, thereby reducing the overall luminance of the liquid crystal display device. There is a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a backlight assembly having a light compensating plate to improve color mixing and light efficiency, and to be advantageous in slimming, and a liquid crystal display device having the same.

In order to achieve the above object, the backlight assembly according to the present invention,

A light emitting diode disposed at predetermined intervals to emit light; And

It includes; a light compensation plate disposed on the light emitting diode.

In addition, the liquid crystal display device according to the present invention,

A light emitting diode disposed at predetermined intervals to emit light;

A light compensation plate disposed on the light emitting diode; And

It includes a liquid crystal panel for displaying a predetermined image using the light emitted from the light compensation plate.

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

FIG. 2A is an exploded perspective view illustrating a direct type liquid crystal display device according to a first exemplary embodiment of the present invention, and FIG. 2B is a cross-sectional view taken along the line II-II ′ of FIG. 2A.

As shown in FIGS. 2A and 2B, the liquid crystal display according to the first exemplary embodiment of the present invention includes a liquid crystal panel 110 for displaying an image, a top case 111 for protecting the liquid crystal panel 110, and a liquid crystal panel 110. The backlight assembly 120 may supply light to the liquid crystal panel 110.

The backlight assembly 120 includes a bottom case 180, a plurality of light emitting diodes 150 disposed at predetermined intervals on the batter case 180 to emit light, and a power supply to the light emitting diodes 150. A plurality of printed circuit boards (160) for supplying light, a light compensation plate (200) disposed on the light emitting diodes (150) for mixing and condensing light, and an optical sheet (130) for diffusing and condensing the light. And a support main 190 fixed and supported to the liquid crystal panel 110 and fixed to the bottom case 180.

The bottom case 180 of the backlight assembly 120 further includes a reflecting plate 170 attached or coated to reflect light.

The light emitting diode 150 includes a red light emitting diode emitting red light, a green light emitting diode emitting green light, and a blue light emitting diode emitting blue light.

The light emitting diode 150 has a side type which is advantageous for stabilizing luminance by mixing light evenly. The light emitting diode 150 of red (R), green (G), and blue (B) may be formed. Emitted from the light is emitted as white (W) light while being mixed with each other

The light compensation plate 200 is polyethylene terephthalate, polyethylene naphthalate, acrylic resin, polycarbonate, polystyrene, polyolefin, cellulose acetate, It may be made of a material such as polymethyl-methacrylate (PMMA) or a synthetic resin, and may include a haze for diffusing light.

A round pattern 210 having a round shape is formed on the front surface of the light compensation plate 200, and a pyramid pattern 220 having a pyramid shape is formed on a rear surface of the light compensation plate 200.

The round pattern 210 and the pyramid pattern 220 may be formed to correspond to each other, or may not be formed to correspond to each other.

The round pattern 210 is formed to face the liquid crystal panel 110, and the pyramid pattern 220 is formed to face the light emitting diode 150.

The round pattern 210 and the pyramid pattern 220 are periodically arranged in a repeating pattern without gaps left and right.

The pyramid pattern 220 serves to diffuse light generated from the light emitting diodes 150.

The pyramid pattern 220 diffuses light having an inclined slope generated from the light emitting diodes 150 by the inclined surface. Accordingly, the color mixture may be improved by diffusing light of red (R), green (G), and blue (B) generated from the light emitting diodes 150.

Since the path of the light is changed according to the round inclination, the round pattern 210 serves to improve light efficiency by uniformly radiating the light toward the front surface of the liquid crystal panel 110.

The light compensation plate 200 is not limited to the pyramid pattern 220 formed on the rear surface, and a prism pattern may be formed to diffuse color to improve color mixing.

In the liquid crystal display according to the first embodiment, a pyramid pattern 220 or a prism pattern is formed on the rear surface of the light compensation plate 200 to improve color mixing, and a round pattern 210 is formed on the entire surface to improve light efficiency. As a result, the liquid crystal display device, which is advantageous in slimming, can be implemented by narrowing the distance L2 between the optical sheets 130 and the light emitting diodes 150.

In the liquid crystal display according to the first exemplary embodiment of the present invention as described above, the light compensation plate 200 is disposed on the light emitting diodes 150 to form a pyramid pattern 220 formed on the rear surface of the light compensation plate 200. Color diffusion may be improved by diffusing the light, and light efficiency may be improved by condensing the light by the round pattern 210 formed on the front surface of the light compensation plate 200.

Figure 3a is a perspective view showing a front surface of the light compensation plate according to the present invention, Figures 3b and 3c is a perspective view showing a rear surface of the light compensation plate according to the present invention.

As shown in Figure 3a, the light compensation plate 200 of the present invention includes a round pattern 210 of a round shape on the front.

The round pattern 200 may be periodically arranged left and right and up and down without a gap in a repeating pattern, or may be randomly arranged.

The round pattern 210 changes the path of the incident light according to the round slope to distribute the light evenly forward. As such, the round pattern 210 serves to condense by changing a path of light incident at an inclined slope.

As shown in FIGS. 3B and 3C, the light compensation plate 200 of the present invention includes a pyramid-shaped pyramid pattern 220a or a prism-shaped prism pattern 220b on the rear surface.

The pyramid pattern 220a is formed in the form of four inclined surfaces having a predetermined inclination, and the inclinations of the four inclined surfaces are the same, and are formed in the form of meeting from the top. In addition, the surfaces of the four inclined surfaces may be smoothly formed without being curved or rough.

The pyramid pattern 220a serves to improve the color mixing of the red (R), green (G), and blue (B) light by changing and diffusing the path of the incident light according to the inclination of the four inclined surfaces.

The prism pattern 220b is formed to extend in the other direction from one side of the rear surface of the light compensation plate 200 in the form of a mountain. The prism pattern 220b is formed of first and second inclined surfaces having predetermined inclinations, and the inclinations of the first and second inclined surfaces are the same, and are formed to meet at the top.

The prism pattern 220b has a shape in which the widths of the first and second inclined surfaces decrease from the bottom to the top. The inclined surface has a constant slope, and serves to diffuse the light by changing the path of the light incident by the constant slope.

4 is a view showing an optical path of region A of FIG. 2B according to the first embodiment of the present invention.

As shown in FIG. 4, since the backlight assembly 120 of the liquid crystal display according to the first exemplary embodiment is the same as the component illustrated in FIG. 2B, the description of the components will be omitted.

The light emitting diode 150 provided as a light source of the backlight assembly 120 includes a red (R) light emitting diode 151, a green (G) light emitting diode 152, and a blue (B) light emitting diode 153. The light emitting diode 150 has a side type in which light is emitted to the side of the light emitting diode 150.

The inclined light generated by the light emitting diodes 150 is incident on the inclined surface of the pyramid pattern 220 so that the light path is changed and diffused. The diffused light is condensed by the inclined surface of the round pattern 210 and condensed under the liquid crystal panel 110.

5A to 5C are cross-sectional views illustrating light compensation plates according to second to fourth embodiments of the present invention.

As shown in FIG. 5A, a round first round pattern 310 protrudes from a front surface of the light compensation plate 300 according to the second embodiment, and a round second round pattern ( 320 is formed in the direction of the first round pattern 310.

The first round pattern 310 and the second round pattern 320 may correspond to each other or may not correspond to each other.

The second round pattern 320 serves to improve color mixing by changing and diffusing the light path by tilting the incident light, and the first round pattern 310 reduces the light path by tilting the incident light. By changing and diffusing and condensing, it serves to improve the light efficiency.

As shown in FIG. 5B, a pyramid-shaped pyramid pattern 410 is formed on the front surface of the light compensation plate 400 according to the third embodiment, and a round-shaped round pattern 420 is formed on the rear surface.

The pyramid pattern 410 and the round pattern 420 may correspond to each other or may not correspond to each other.

The round pattern 420 serves to improve color mixing by diffusing the incident light by changing the light path by the inclination of the round pattern 420, and the pyramid pattern 410 inclines the incident light By changing the light path by the slope of the light condensing role.

A prism pattern may be formed on the rear surface of the light compensation plate 400 according to the third embodiment.

As shown in FIG. 5C, in the light compensation plate 500 according to the fourth embodiment, a first pyramid pattern 510 is formed on a front surface thereof, and a second pyramid pattern 520 is formed on a rear surface thereof.

The first pyramid pattern 510 protrudes, and the second pyramid pattern 520 protrudes in a direction corresponding to the first pyramid pattern 510.

The first pyramid pattern 510 and the second pyramid pattern 520 may correspond to each other, or may not correspond to each other.

The second pyramid pattern 520 serves to improve color mixing by expanding the incident light by changing the optical path by the inclination of the inclined plane, and the second pyramid pattern 520 inclines the incident light into the inclined plane By changing the optical path by the light condensing role.

Not limited to the first to fourth embodiments, a pyramid pattern may be formed on a front surface of the light compensation plate, a prism pattern may be formed on a rear surface thereof, a prism pattern may be formed on a front surface thereof, and a pyramid pattern may be formed on a rear surface thereof. It may be. In addition, a first prism pattern may be formed on the front surface of the light compensation plate 500, and a second prism pattern may be formed on the rear surface of the light compensation plate 500.

According to the present invention, the light compensation plates 200, 300, 400, and 500 formed on the front and the rear of the round pattern, the pyramid pattern, or the prism pattern are disposed on the light emitting diodes 150, thereby improving color mixing and light efficiency. As a result, it is possible to implement a liquid crystal display device which is advantageous for slimming.

According to the present invention, a light compensation plate having one of a round pattern, a pyramid pattern, and a prism pattern formed on a front surface and a rear surface thereof is disposed on a light source, thereby improving color mixing and light efficiency. Accordingly, there is an advantageous effect on slimming.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (10)

  1. Side type light emitting diodes disposed at regular intervals to emit red, green, and blue light from the side, respectively;
    A light compensation plate disposed on the light emitting diodes; And
    A diffusion sheet and a light collecting sheet disposed on the light compensation plate,
    A round pattern for condensing light is formed on the front surface of the light compensation plate, and a back light assembly has a pyramid pattern having four inclined surfaces for diffusing light.
  2. Side type light emitting diodes disposed at regular intervals to emit red, green, and blue light from the side, respectively;
    A light compensation plate disposed on the light emitting diodes; And
    A diffusion sheet and a light collecting sheet disposed on the light compensation plate,
    A pyramid pattern having four inclined surfaces for condensing light formed in an upper direction is formed on the front surface of the light compensation plate, and a round pattern is formed on the rear surface of the light compensation plate to diffuse light formed in the pyramid pattern direction. Backlight assembly.
  3. Side type light emitting diodes disposed at regular intervals to emit red, green, and blue light from the side, respectively;
    A light compensation plate disposed on the light emitting diodes; And
    A diffusion sheet and a light collecting sheet disposed on the light compensation plate,
    A first round pattern for condensing light formed in the upper direction is formed on the front surface of the light compensation plate, and a second round pattern for diffusing light formed in the first round pattern direction is formed on the rear surface of the light compensation plate. Backlight assembly.
  4. Side type light emitting diodes disposed at regular intervals to emit red, green, and blue light from the side, respectively;
    A light compensation plate disposed on the light emitting diodes; And
    A diffusion sheet and a light collecting sheet disposed on the light compensation plate,
    A first pyramid pattern having four inclined surfaces protruding upward and condensing light is formed on the front surface of the light compensation plate, and a fourth inclined surface having four inclined surfaces diffusing light formed in the lower direction on the rear surface of the light compensation plate. Backlight assembly, characterized in that the pyramid pattern is formed.
  5. delete
  6. delete
  7. Side type light emitting diodes disposed at regular intervals to emit red, green, and blue light from the side, respectively;
    A light compensation plate disposed on the light emitting diodes;
    A diffusion sheet and a light collecting sheet disposed on the light compensation plate; And
    It includes a liquid crystal panel for displaying an image using the light emitted from the light compensation plate,
    And a round pattern for condensing light on a front surface of the light compensation plate, and a pyramid pattern having four inclined surfaces for diffusing light on a rear surface of the light compensation plate.
  8. Side type light emitting diodes disposed at regular intervals to emit red, green, and blue light from the side, respectively;
    A light compensation plate disposed on the light emitting diodes;
    A diffusion sheet and a light collecting sheet disposed on the light compensation plate; And
    It includes a liquid crystal panel for displaying an image using the light emitted from the light compensation plate,
    A liquid crystal display having a pyramid pattern having four inclined surfaces for condensing light formed in an upper direction on a front surface of the light compensation plate, and a round pattern having a round pattern for diffusing light formed in the pyramid pattern direction on a rear surface of the light compensation plate. .
  9. Side type light emitting diodes disposed at regular intervals to emit red, green, and blue light from the side, respectively;
    A light compensation plate disposed on the light emitting diodes;
    A diffusion sheet and a light collecting sheet disposed on the light compensation plate; And
    It includes a liquid crystal panel for displaying an image using the light emitted from the light compensation plate,
    A first round pattern for condensing light formed in an upper direction is formed on the front surface of the light compensation plate, and a liquid crystal display having a second round pattern for diffusing light formed in the first round pattern direction on a rear surface of the light compensation plate. Device.
  10. Side type light emitting diodes disposed at regular intervals to emit red, green, and blue light from the side, respectively;
    A light compensation plate disposed on the light emitting diodes;
    A diffusion sheet and a light collecting sheet disposed on the light compensation plate; And
    It includes a liquid crystal panel for displaying an image using the light emitted from the light compensation plate,
    A first pyramid pattern having four inclined surfaces protruding upward and condensing light is formed on the front surface of the light compensation plate, and a fourth inclined surface having four inclined surfaces diffusing light formed in the lower direction on the rear surface of the light compensation plate. 2. A liquid crystal display device having a pyramid pattern formed thereon.
KR1020050135084A 2005-12-30 2005-12-30 Backlight assembly and liquid crystal display device having the same KR101291938B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
KR1020050135084A KR101291938B1 (en) 2005-12-30 2005-12-30 Backlight assembly and liquid crystal display device having the same

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KR101291938B1 true KR101291938B1 (en) 2013-07-31

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH078805U (en) * 1993-06-29 1995-02-07 信越ポリマー株式会社 Directional diffuser and its Applications
JP2005043611A (en) * 2003-07-28 2005-02-17 Dainippon Printing Co Ltd Optical sheet, surface light source device, and transmission-type display device
JP2005107020A (en) * 2003-09-29 2005-04-21 Sony Corp Manufacturing method for backlight and diffusing plate and liquid crystal display device
JP2005332828A (en) * 2004-05-07 2005-12-02 Lumileds Lighting Us Llc Multi-colored led array with improved brightness profile and color uniformity

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH078805U (en) * 1993-06-29 1995-02-07 信越ポリマー株式会社 Directional diffuser and its Applications
JP2005043611A (en) * 2003-07-28 2005-02-17 Dainippon Printing Co Ltd Optical sheet, surface light source device, and transmission-type display device
JP2005107020A (en) * 2003-09-29 2005-04-21 Sony Corp Manufacturing method for backlight and diffusing plate and liquid crystal display device
JP2005332828A (en) * 2004-05-07 2005-12-02 Lumileds Lighting Us Llc Multi-colored led array with improved brightness profile and color uniformity

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