KR200288853Y1 - Display and back-light unit for display - Google Patents

Abstract

The present invention relates to a display device and a backlight unit for a display device, the backlight unit comprising: a support frame; A light guide plate mounted at one end thereof and provided in the support frame, and having a first pattern formed on at least one surface to focus light toward the plate surface of the panel; A reflection sheet disposed on one side of the light guide plate; A prism sheet disposed on the other side of the light guide plate with respect to the reflective sheet and having a second pattern formed on one surface thereof; And a diffusion sheet provided between at least one of the light guide plate and the prism sheet and an upper portion of the prism sheet to diffuse light. As a result, a display device and a backlight unit for a display device, which can increase the production efficiency through a simple structure and significantly reduce the overall production cost, are provided.

Description

Display and back-light unit for display

The present invention relates to a display device and a backlight unit for a display device, and more particularly, a display device and a backlight unit for a display device that can significantly reduce the overall production cost while increasing the production efficiency through a simple structure. It is about.

The display device refers to a TV, a computer monitor, or a liquid crystal of a notebook computer. The CRT panel and the LCD panel are generally used.

CRT panel uses cathode ray tube to emit light of different brightness or color by hitting monochromatic or RGB (Red, Green, Blue) fluorescent material coated on the surface of CRT panel according to the intensity of video signal. It uses the principle that is made by me, and it is widely used because it is economical and excellent in terms of price and display performance, but it has the disadvantage of being bulky.

On the other hand, the LCD panel uses the principle that the molecular arrangement of liquid crystal (liquid crystal) is disturbed by passing a constant voltage, so that light cannot pass through it. Not only is it less expensive, but it is easier to flatten. Hereinafter, a display device having an LCD panel will be described as an embodiment.

An LCD panel (hereinafter referred to as a "panel") provided in a display device is adopted in such a manner that it does not emit light on its own and adjusts the light transmittance, so that light is projected onto the panel so that a predetermined image is formed on the panel. There is a need for a so-called back-light unit, which is a light source.

The backlight unit is a direct method of directly dimming the front surface of the panel by arranging a light source on one side of the panel, and an edge for reflecting / diffusing light on a light guide plate and a reflective sheet by disposing a light source on one side or a plurality of sides of the panel. ) Is divided into Currently, devices such as notebook computers mainly adopt the latter edge method.

However, the edge type backlight unit is lower in brightness than the direct backlight unit. In order to compensate for this, the conventional backlight unit uses two prism sheets arranged in an overlapping manner to focus light vertically toward the panel.

A schematic partial side cross-sectional view of such a conventional backlight unit is shown in FIG. 1. As shown in this drawing, the conventional backlight unit 130 includes a support frame 132, a light guide plate 133 provided in the support frame 132, and an area of the light guide plate 133 under the light guide plate 133. And a reflection sheet 137 disposed substantially the same as that of the light guide plate 133 to prevent light from leaking to the lower portion of the light guide plate 133, a diffusion sheet 139 disposed on the light guide plate 133 to uniformly diffuse light, It has a pair of prism sheets 140 and 141 superposed on the sheet 139 and a protective sheet 142 provided on the prism sheets 140 and 141.

The light guide plate 133 is formed to be inclined so that the upper surface toward the pair of prism sheets 140 and 141 is flat and the lower surface thereof becomes narrower from one end to the other end. At one end of the light guide plate 133, a lamp 135, which is a light source for emitting light, is mounted by the lamp housing 136.

On the plate surfaces of the pair of prism sheets 140 and 141, triangular linear prisms 140a and 141a are continuously formed to collect light diffused by the diffusion sheet 139, respectively. The linear prisms 140a and 141a formed on the pair of prism sheets 140 and 141 face the protective sheet 142, and the directions of the linear prisms 140 and 141a are arranged perpendicular to each other to condense light in different directions.

With this configuration, when the lamp 135 emits light and the light from the lamp 135 is incident on the light guide plate 133 and proceeds along the plate surface of the light guide plate 133, a part of the light is reflected by the light guide plate 133 by reflection and scattering. ) Is moved to the diffusion sheet 139 on the upper side, and the rest is directed to the lower reflective sheet 137 of the light guide plate 133. At this time, the light directed to the reflective sheet 137 is reflected by the reflective sheet 137 and is moved back to the diffusion sheet 139 through the light guide plate 133.

Light diffused from the lamp 135 to the diffusion sheet 139 through the light guide plate 133 is uniformly diffused through the diffusion sheet 139 and then directed to the pair of prism sheets 140 and 141. The prism sheets 140 and 141 are refracted by the plurality of linear prisms 140a and 141a formed on the surface of the light guide plate 133 in the direction perpendicular to the surface of the light guide plate 133 in the direction perpendicular to the light guide plate 133. It enters into the panel 115 through 142. Therefore, the image formed in the panel 115 can be seen by the light incident on the panel 115.

By the way, in the conventional backlight unit 130 having the above structure, the backlight unit 130 is manufactured by overlapping a plurality of sheets 137, 139, 140, 141 and 142, and the structure thereof is quite complicated.

In addition, since the prism sheets 140 and 141 having a relatively high unit price must be provided in pairs, there is a problem in that the production cost of the backlight unit 130 is high and the assembly process is complicated, thereby significantly lowering the production efficiency.

Accordingly, it is an object of the present invention to provide a display device and a backlight unit for a display device that can significantly reduce the overall production cost while increasing the production efficiency through a simple structure.

1 is a schematic side cross-sectional view of a conventional backlight unit;

2 is a schematic partial exploded perspective view of a display device according to the present invention;

3 is a schematic side cross-sectional view of a backlight unit according to a first embodiment of the present invention;

4 is an enlarged view of region “A” of FIG. 3,

5A and 5B are top and bottom views of the light guide plate illustrated in FIG. 4, respectively.

FIG. 6A is a top view of the light guide plate shown in FIG. 5A and FIG. 6B is a bottom view of the light guide plate showing the second embodiment of FIG. 4;

7A and 7B are enlarged main views of the light guide plate according to the third and fourth embodiments, respectively;

8A and 8B are top and bottom views of the light guide plate shown in FIG. 7B, respectively;

9 is a schematic side cross-sectional view of a backlight unit according to a fifth embodiment of the present invention corresponding to FIG. 3;

FIG. 10 is a schematic side cross-sectional view of a backlight unit according to a sixth embodiment of the present invention corresponding to FIG. 3.

* Explanation of symbols for the main parts of the drawings

20: display device 15: panel

30: backlight unit 32: support frame

33,33 ', 33 ", 33"': Light guide plate 34: First pattern

34a, 34'a, 34 "a, 34" 'a: first upper surface pattern 34b, 34'b, 34 "b, 34"' b: first lower surface pattern

35 lamp 36 lamp housing

37: reflective sheet 38: prism sheet

38a, 38'a: second pattern 39: diffusion sheet

The above object is, according to the present invention, a display device having a panel on which an image is formed and a backlight unit disposed on one side of the panel to transmit light to the panel, the backlight unit comprising: a support frame; A light guide plate mounted at one end thereof and provided in the support frame, and having a first pattern formed on at least one surface to focus light toward the plate surface of the panel; A reflection sheet disposed on one side of the light guide plate; A prism sheet disposed on the other side of the light guide plate with respect to the reflective sheet and having a second pattern formed on one surface thereof; And a diffusion sheet provided between at least one of the light guide plate and the prism sheet and an upper portion of the prism sheet to diffuse light.

Here, the first pattern includes a first upper surface pattern and a first lower surface pattern respectively formed on the upper and lower surfaces of the light guide plate.

The first upper surface and the first lower surface pattern are integrally formed on the upper and lower surfaces of the light guide plate.

One of the first upper surface and the first lower surface pattern may be a dot pattern and the other may be a prism pattern. At this time, it is advantageous that the dot pattern formed on any one of the first upper surface and the first lower surface pattern is an embossed projection having an embossed protrusion protruding from the plate surface.

The second pattern formed on the prism sheet may be formed toward the light guide plate or may be formed toward the panel as a prism pattern.

Advantageously, the prism pattern formed on the other of the first upper surface and the first lower surface pattern and the second pattern formed on the prism sheet cross each other in the orthogonal direction.

The diffusion sheet may be provided on an upper portion of the prism sheet.

On the other hand, according to another field of the present invention, the above object, according to the present invention, in the backlight unit for a display device for transmitting light to the panel is disposed on one side of the panel provided in the display device to form an image, the support frame and ; A light guide plate mounted at one end thereof and provided in the support frame, and having a first pattern formed on at least one surface to focus light toward the plate surface of the panel; A reflection sheet disposed on one side of the light guide plate; A prism sheet disposed on the other side of the light guide plate with respect to the reflective sheet and having a second pattern formed on one surface thereof; It is also achieved by a backlight unit for a display device comprising a diffusion sheet provided between at least one side of the light guide plate and the prism sheet and an upper portion of the prism sheet to diffuse light.

Here, the first pattern includes a first upper surface pattern and a first lower surface pattern respectively formed on the upper and lower surfaces of the light guide plate.

The first upper surface and the first lower surface pattern are integrally formed on the upper and lower surfaces of the light guide plate.

One of the first upper surface and the first lower surface pattern may be a dot pattern and the other may be a prism pattern. At this time, it is advantageous that the dot pattern formed on any one of the first upper surface and the first lower surface pattern is an embossed projection having an embossed protrusion protruding from the plate surface.

The second pattern formed on the prism sheet may be formed toward the light guide plate or may be formed toward the panel as a prism pattern.

Advantageously, the prism pattern formed on the other of the first upper surface and the first lower surface pattern and the second pattern formed on the prism sheet cross each other in the orthogonal direction.

The diffusion sheet may be provided on an upper portion of the prism sheet.

Hereinafter, with reference to the accompanying drawings will be described in detail for each embodiment of the present invention and the same reference numerals are assigned to the same configuration.

As described above, the display device 20 refers to a TV, a computer monitor, or a liquid crystal of a notebook computer. Hereinafter, as shown in FIG. 2, the present invention will be described with the laptop computer as an embodiment.

As shown in FIG. 2, the display device 20 according to the present invention includes a RAM, a disk driver, various cards such as a graphics card, and the like on a main board on which a CPU is mounted. Is provided, and it is coupled to the main body 10 provided with the keyboard 10a etc. which input predetermined information in the outer side.

The display apparatus 20 is supported by a pair of cover housings 12a and 12b coupled in the front-rear direction and is disposed behind the panel 15 and the panel 15 having an image formed on the plate surface. It includes a backlight unit 30 for transmitting light to the. As described above, the panel 15 itself is manufactured in such a manner that it does not emit light but adjusts the transmittance of the light, so that a predetermined image is formed on the panel 15 to project light onto the panel 15. Back-light unit (30) is necessary.

3 is a schematic side cross-sectional view of the backlight unit 30 according to the first embodiment of the present invention. As shown in this figure, the backlight unit 30 according to the first embodiment of the present invention has a rectangular frame-shaped support frame 32, a light guide plate 33 provided in the support frame 32, and a light guide plate 33. A reflection sheet 37 disposed on one side of the plate surface, a prism sheet 38 disposed on the other plate surface of the light guide plate 33 with respect to the reflection sheet 37, and an upper portion of the prism sheet 38 to diffuse light. Diffusion sheet 39 is included. At this time, a protective sheet (not shown) for protecting them may be further provided on the diffusion sheet 39.

The display device 20 shown in this embodiment has a rectangular shape. Thus, the support frame 32 of the backlight unit 30 also forms a rectangular frame. However, in order to enhance the beauty of appearance and satisfy various consumer curiosity, if the display apparatus 20 has a circular or elliptical shape instead of a rectangular shape, the support frame 32 may also take a corresponding shape. .

The light guide plate 33 is formed to be inclined so that the upper surface toward the diffusion sheet 39 is flat and the lower surface toward the reflective sheet 37 becomes narrower from one end to the other end. At one end of the light guide plate 33, a lamp 35, which is a light source for emitting light, is mounted by the lamp housing 36. The lamp housing 36 collects the amount of light emitted from the lamp 35 into the light guide plate 33, and the light guide plate 33 is provided to evenly output the light emitted from the lamp 35.

On the other hand, at least one surface of the light guide plate 33 is formed with a first pattern 34 for condensing the light from the lamp 35 toward the plate surface of the panel 15.

The first pattern 34 includes a first upper surface pattern 34a formed on the upper surface of the light guide plate 33 and a first lower surface pattern 34b formed on the lower surface of the light guide plate 33. The first upper surface and the first lower surface patterns 34a and 34b may be integrally formed on the upper and lower surfaces of the light guide plate 33 when the light guide plate 33 is manufactured. That is, a stamper (not shown) is mounted inside a mold MOLD (not shown), and the light guide plate 33 is molded by using an injection molding machine or a press. When the stamper mounted inside the mold is mounted in the upper side and the lower side (not shown) of the mold, respectively, and the light guide plate is molded, the first upper surface and the first bottom surface pattern 34a and 34b are formed on the light guide plate 33 to be formed. When the stamper is mounted only on one side of the upper side and the lower side of the mold, patterns are formed only on one surface of the light guide plate. The shape of the first upper surface and the first lower surface patterns 34a and 34b is determined by a pattern of a predetermined shape formed on a stamper (not shown) plate surface, so that the light guide plate 33 is formed when forming a light guide plate using an injection molding machine. The shapes of the patterns on the upper and lower surfaces of the are transferred to the light guide plate 33.

At this time, the first upper surface and the first lower surface patterns 34a and 34b formed on the light guide plate 33 face each other in the forward direction so that light emitted from the lamp 35 can be focused toward the entire surface of the panel 15. It may be formed, or may have a different arrangement direction.

This will be described in more detail with reference to the drawings.

For example, as shown in FIG. 4 in which the area “A” of FIG. 3 and FIG. 3 are enlarged, the first top pattern 34a is a dot pattern, and the first bottom pattern 34b is a triangular prism. It can be configured as a pattern. At this time, the dot pattern formed on the first upper surface 34a is preferably an embossed projection embossed from the plate surface.

In addition, when the shape of the first upper surface pattern 34a formed on the upper surface of the light guide plate 33 is as shown in FIG. 5A, as shown in FIG. 5B, the shape of the first lower surface pattern 34b is vertically ( It may be formed in the front and rear direction).

In addition, when the shape of the first upper surface pattern 34 ′ a formed on the upper surface of the light guide plate 33 ′ is as illustrated in FIG. 6A, as illustrated in FIG. 6B, the first lower surface pattern 34 ′ b is formed. The shape may be made in the horizontal direction (left and right directions).

Meanwhile, unlike FIG. 3 and FIG. 4, as shown in FIG. 7A, the first upper surface pattern 34 ″ a formed on the upper surface of the light guide plate 33 ″ is a triangular prism pattern, and the first lower surface pattern formed on the lower surface of the light guide plate 33 ″. 34 " b may be a dot pattern. In this case, it is also advantageous that the first lower surface pattern 34 " b is an embossed projection embossed from the plate surface.

As shown in FIG. 7B, the first upper surface and the first lower surface patterns 34 ″ 'a and 34 ″' b formed on the upper and lower surfaces of the light guide plate 33 ″ 'may be triangular prism patterns. At this time, in the case of the light guide plate 33 "'of FIG. 7B, as shown in FIG. 8A, if the 1st top surface pattern 34"' a has the arrangement direction to the left-right direction, the 2nd lower surface pattern will be carried out. As shown in FIG. 8B, 34 "'b may have the arrangement direction in the front-back direction, or the arrangement direction may change mutually.

Although not shown, the first upper surface and the first lower surface pattern 34 "'a, 34"' b may have a diagonal direction or a predetermined inclination direction of the light guide plate 33 "'differently from FIGS. 8A and 8B. In addition, all of the above-described prism pattern shapes may form a linear triangular shape, or may have a triangular shape and a trapezoidal shape of an inclination biased to one side.

The reflective sheet 37 is disposed on the lower surface of the light guide plate 33 to be substantially equal to the area of the light guide plate 33, and serves to reflect the light transmitted back to the lower surface of the light guide plate 33. That is, when a part of the light emitted from the lamp 35 is directed to the reflective sheet 37, the light may be reflected back by the reflective sheet 37 and may be directed to the prism sheet 38 through the light guide plate 33.

The second pattern 38a is formed on one surface of the prism sheet 38. In the present embodiment, the second pattern 38a formed on the prism sheet 38 is formed in a prism pattern having an equilateral triangle shape to condense light, and is formed in the opposite direction toward the light guide plate 33 (see FIG. 3). However, this is also just one embodiment, and as shown in FIG. 9, the second pattern 38 ′ a may be directed toward the diffusion sheet 39, and may have a crooked triangular pyramid shape or a trapezoid instead of an equilateral triangle. It can also be embossed projections.

At this time, the first lower surface pattern 34b and the first upper surface pattern 34 "formed on the second patterns 38a and 38'a and the light guide plate 33 of the prism sheet 38 shown in FIGS. 3 and 9, respectively. It is preferable that a) intersects mutually orthogonally.

A process of transmitting light to the panel 15 by the backlight unit 30 having such a configuration will be described with reference to FIG. 3.

When power is applied and the lamp 35 is turned on, the light from the lamp 35 is collected and transmitted to the light guide plate 33 by the lamp housing 36. When the light of the lamp 35 enters the light guide plate 33 and proceeds along the plate surface of the light guide plate 33, part of the light is moved to the upper prism sheet 38 of the light guide plate 33 by reflection and scattering, and the rest is The lower surface of the light guide plate 33 faces the reflective sheet 37. Light directed to the reflective sheet 37 is reflected by the reflective sheet 37 and is directed back to the prism sheet 38 through the light guide plate 33.

At this time, since the first upper surface and the first lower surface patterns 34a and 34b are formed on the upper and lower surfaces of the light guide plate 33, and the second pattern 38a is formed on the prism sheet 38, the light guide plate 33 is formed. The light spaced apart or separated from the direction perpendicular to the upper surface of the light is refracted by the second pattern 38a along with the first upper surface and the first lower surface patterns 34a and 34b to diffuse in the direction perpendicular to the light guide plate 33. Head to 39).

The light directed toward the diffusion sheet 39 is uniformly diffused through the diffusion sheet 39 and then incident on the panel 15 so that the user can see an image formed on the panel 15.

Thus, according to the backlight unit 30 of the present invention, instead of employing a pair of prism sheets 38 as in the prior art, the first upper surface and the first lower surface patterns 34a and 34b on the plate surface of the light guide plate 33. ) And the production cost can be reduced by employing a single prism sheet 38. In addition, unlike the related art, the structure is simple, so that the production efficiency can be significantly increased.

In the above-described embodiment, the first upper surface and the first lower surface patterns 34a and 34b are described as being integrally formed on the upper and lower surfaces of the light guide plate 33. However, in addition to this method, separate first upper surface and first lower surface pattern sheet (not shown) may be attached to both surfaces of the light guide plate 33, respectively.

In addition, in the above-described embodiment, the first pattern 34 is described on both the top and bottom surfaces of the light guide plate 33. However, in some cases, the first pattern 34 may be formed on only one of the top and bottom surfaces of the light guide plate 33. It is a matter of course that the pattern 34 may be formed. In addition, the first pattern 34 formed on the light guide plate 33 may have a droplet shape or the like.

In the above-described embodiment, it has been described that the diffusion sheet 39 is provided on the prism sheet 38. However, as shown in FIG. 10, even if the diffusion sheet 39 is disposed between the light guide plate 33 and the prism sheet 38, there is no problem in realizing the idea of the present invention.

As described above, according to the present invention, there is provided a display device and a backlight unit for a display device that can significantly reduce the overall production cost while increasing the production efficiency through a simple structure.

Claims (18)

A display apparatus having a panel on which an image is formed and a backlight unit disposed on one side of the panel to transmit light to the panel. The backlight unit, A support frame; A light guide plate mounted at one end thereof and provided in the support frame, and having a first pattern formed on at least one surface to focus light toward the plate surface of the panel; A reflection sheet disposed on one side of the light guide plate; A prism sheet disposed on the other side of the light guide plate with respect to the reflective sheet and having a second pattern formed on one surface thereof; And a diffusion sheet provided between at least one of the light guide plate and the prism sheet and an upper portion of the prism sheet to diffuse light. The method of claim 1, The first pattern includes a first upper surface pattern and a first lower surface pattern formed on the upper and lower surfaces of the light guide plate, respectively. The method of claim 2, And the first upper surface and the first lower surface pattern are integrally formed on the upper and lower surfaces of the light guide plate. The method of claim 2, And one of the first upper surface and the first lower surface pattern is a dot pattern and the other is a prism pattern. The method of claim 4, wherein And a dot pattern formed on one of the first upper surface and the first lower surface pattern is an embossed projection embossed from the plate surface. The method according to claim 1 or 5, And the second pattern formed on the prism sheet is formed toward the light guide plate as a prism pattern. The method of claim 6, And the second pattern is formed toward the panel. The method of claim 7, wherein And a prism pattern formed on the other of the first upper surface and the first lower surface pattern and the second pattern formed on the prism sheet cross each other in a direction perpendicular to each other. The method of claim 1, And the diffusion sheet is provided on an upper portion of the prism sheet. In the backlight unit for a display device that is disposed on one side of the panel provided on the display device to form an image, and transmits light to the panel A support frame; A light guide plate mounted at one end thereof and provided in the support frame, and having a first pattern formed on at least one surface to focus light toward the plate surface of the panel; A reflection sheet disposed on one side of the light guide plate; A prism sheet disposed on the other side of the light guide plate with respect to the reflective sheet and having a second pattern formed on one surface thereof; And a diffusion sheet provided between at least one of the light guide plate and the prism sheet and an upper portion of the prism sheet to diffuse light. The method of claim 10, The first pattern includes a first upper surface pattern and a first lower surface pattern formed on the upper and lower surfaces of the light guide plate, respectively. The method of claim 11, And the first upper surface and the first lower surface pattern are integrally formed on upper and lower surfaces of the light guide plate. The method of claim 11, And one of the first upper surface and the first lower surface pattern is a dot pattern and the other is a prism pattern. The method of claim 13, And a dot pattern formed on one of the first upper surface and the first lower surface pattern is an embossed projection embossed from the plate surface. The method according to claim 10 or 14, The second pattern formed on the prism sheet is a prism pattern formed toward the light guide plate. The method of claim 15, And the second pattern is formed toward the panel. The method of claim 16, And a prism pattern formed on the other of the first upper surface and the first lower surface pattern and the second pattern formed on the prism sheet cross each other in a direction perpendicular to each other. The method of claim 10, And the diffusion sheet is provided on an upper portion of the prism sheet.