KR101001263B1 - A Reflective Sheet For Backlight and Backlight Unit With It - Google Patents

Abstract

The present invention provides a backlight upward reflection sheet for repeatedly forming upward reflection means capable of reflecting light and heat generated from a light source upward, and a backlight upward reflection sheet for backlight repeatedly formed with upward reflection means. Provided is a backlight unit attached to a module substrate to be implanted.

The present invention can reflect and emit light and heat generated from the light source upwards by upward reflecting means, and lower the temperature around the light source and protect the system by simultaneously reflecting and emitting the light and heat generated from the light source upwards. can do.

In addition, the present invention, since the light and heat generated from the light source is raised by the specular reflection by the upward reflection means so that the reflected light and the reflected heat do not penetrate into the light source light generated from the light source to protect the light source light and does not interfere Light can be scanned onto the flat panel display to improve color reproducibility of the flat panel display.

Reflective sheet. Flat reflective sheet. Light source. Module board. Upward reflection sheet. Triangular reflection bar. Reflective slope. Backlight unit.

Description

A Reflective Sheet For Backlight and Backlight Unit With It}

The present invention relates to a backlight upward reflection sheet for attaching to a front surface of a module substrate (PCB) to reflect the light generated from the light source to the front and a backlight unit formed using the same.

In more detail, the upper and lower reflecting means for repeatedly reflecting the light and heat generated from the light source to the upper and upper sides is formed repeatedly, in particular, the inclined surface used as the reflecting surface is based on the center line Backlight upward reflecting sheet for forming a space inside the intersection where the horizontal triangular reflection bar and the longitudinal triangular reflection bar cross each other while maintaining the triangular reflection bars formed on both sides at regular intervals, and the backlight formed as such The purpose of the present invention is to provide a backlight unit by attaching an upward reflection sheet for a module to a module substrate on which a light source is placed.

As is commonly known, a backlight unit is installed on a flat panel display device that applies the principle that liquid crystals vary in molecular structure according to an applied voltage to provide a light source to display a screen on a flat panel display device. Device).

Such a backlight unit mainly uses a light emitting diode (LED) applied (mounted) in recent years to meet various conditions such as lifespan, brightness, and color reproducibility.

When the light emitting diode (LED) is used as a light source of a backlight unit, the light emitting diode (LED) generates a large amount of heat, so a reflective sheet for emitting heat generated from the light emitting diode (LED) ) Shall be provided (installed) on the module board where the light source is to be implanted.

Failure to dissipate heat generated from the light emitting diodes (LEDs) to the outside will increase the ambient temperature and adversely affect the system.

In general, a metal core substrate (Metal Core Printed Circuit Board) having excellent heat dissipation properties may be used to dissipate heat generated from a light emitting diode (LED).

The metal core substrate is excellent in heat dissipation characteristics, but the price increases the manufacturing cost of the non-incident backlight unit.

Also, conventionally, as illustrated in FIGS. 1A to 1D, the flat reflective sheet 2 is attached to the surface of the module substrate 4 on which the light source 3 is implanted as a reflective sheet for heat dissipation. Used.

When the flat reflective sheet 2 is attached to the surface of the module substrate 4 and used for heat dissipation, as illustrated in FIG. 1B, in the light source 3, the light source light 3-5 and heat Is generated, and part of the light source light 3-5 generated by the light source 3 is reflected by the surface of the flat reflective sheet 2 and is emitted.

However, since the surface of the flat reflecting sheet 2 is formed of a flat plate, light reflection 3-5 occurs on the surface of the flat reflecting sheet 2, so that diffuse reflection occurs on the surface of the flat reflecting sheet 2, There is a problem that some are reflected by other adjacent light sources 3 to raise the heat of the light source 3 to each other, and some heat and light are light source light (3-5) generated by other adjacent light sources (3) As it penetrates and collides with the light, it interferes with the light's brightness and heat release.

In addition, when the heathink 5 is used together with the plate type reflective sheet 2 and connected in series as shown in FIG. 1C (Top) and FIG. 1D (Bottom), a potential difference exists for each section. A short occurs between the electrodes of (3: element), and therefore, in order to prevent the short, there is a closed end in which a piece of metal plate must use a nonconductive heat dissipation sheet.

The present invention is to provide a backlight upward reflection sheet and a backlight unit using the same that can solve the above problems.

The present invention is a reflection sheet for reflecting light and heat generated from the light source,

It is an object of the present invention to provide a backlight upward reflection sheet for backlighting by repeatedly forming upward reflection means capable of reflecting light and heat generated from a light source upward.

Another object of the present invention, the upward reflection means for reflecting the light and heat generated from the light source to the upper side, the inclined surface used as the reflection surface is formed on both sides of the triangular reflection with respect to the center line, the triangular reflection bar at regular intervals It is intended to provide a backlight upward reflection sheet for forming a space inside the intersection where the horizontal triangular reflector bar and the longitudinal triangular reflector bar cross each other while maintaining vertically.

Still another object of the present invention is to reflect and emit light and heat generated from the light source upward by the upward reflecting means formed by the triangular reflection bar, and by simultaneously reflecting and emitting light and heat generated from the light source upward The present invention aims to provide a backlight upward reflection sheet for backlight and a backlight unit using the same, which can lower the temperature around the light source and protect the system.

Still another object of the present invention is to allow light and heat generated from the light source to rise by specular reflection by the upward reflecting means so that the reflected light and the reflected heat do not penetrate the light source light generated from the light source to protect the light source light. In order to improve the color reproducibility of the flat panel display by allowing the light of the light source to rise smoothly to be scanned on the flat panel display to provide a backlight unit and a backlight unit.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects,

In the reflective sheet reflecting light and heat generated from the light source,

It is achieved by the upward reflection sheet for a backlight, characterized in that repeatedly forming an upward reflection means for reflecting light and heat generated from the light source upward.

Other above and other objects of the present invention,

In attaching the reflective sheet to the module substrate on which the light source is implanted,

It is achieved by the backlight unit, characterized in that the upward reflection means for the backlight is formed by repeatedly attaching the module substrate on which the light source is implanted.

The present invention provides a backlight upward reflection sheet for repeatedly forming upward reflection means capable of reflecting light and heat generated from a light source upward, and a backlight upward reflection sheet for backlight repeatedly formed with upward reflection means. It is to provide a backlight unit by attaching to a module substrate to be planted.

The present invention can reflect and emit light and heat generated from the light source upwards by upward reflecting means, and lower the temperature around the light source and protect the system by simultaneously reflecting and emitting the light and heat generated from the light source upwards. You can do it.

In addition, the present invention, since the light and heat generated from the light source is raised by the specular reflection by the upward reflection means so that the reflected light and reflected heat does not penetrate the light source light generated from the light source to protect the light source light and does not interfere It is possible to improve the color reproducibility of the flat panel display by emitting light from the flat panel display.

These and other objects and features of the present invention will be more clearly understood from the following detailed description based on the accompanying drawings.

2A to 5B illustrate specific examples of the upward reflection sheet 10 and the backlight unit 20 according to the present invention.

2A and 2B and FIGS. 3A and 3B show different embodiments of the upward reflection sheet 10 according to the present invention, and FIGS. 4A and 4B illustrate the upward reflection sheet 10 according to the present invention. Illustrates the backlight unit 20 formed by using.

5A and 5B are exemplary views illustrating a state in which light sources are connected in series by using a heat sink in the backlight unit 20 according to the present invention, and FIGS. 6A to 6C illustrate the backlight unit 20 according to the present invention. Exemplary views showing different light sources 3 installed on the module substrate 10.

The upward reflection sheet 10 according to the present invention was formed as illustrated in FIGS. 2A and 2B and FIGS. 3A and 3B.

As an upward reflection means for reflecting light and heat generated from the light source upwards, the inclined surface 12 used as the reflective surface in cross section is the lower vertex 14 on both sides from the upper vertex 13 with respect to the center line (0). The triangular reflection bar 11 of the isosceles triangular shape formed obliquely is mentioned.

Reflecting inclined surfaces 12 formed on both sides of the center line 0 may be formed to be symmetrical with each other as illustrated in FIG. 2B with respect to the center line 0 or as an asymmetric shape although not specifically illustrated. Can be.

The triangular reflector bar 11 is formed of a transverse triangular reflector bar 11-1 and a longitudinal triangular reflector bar 11-2 having a space portion 11-3 formed on a bottom thereof, and a transverse triangular reflector bar 11-1. And longitudinal triangular reflector bars (11-2) were formed in the horizontal and vertical while maintaining a constant interval from each other, and the four adjacent intersection where the transverse triangular reflector bar (11-1) and the longitudinal triangular reflector bar (11-2) intersect each other. The space 15 was formed inside the point.

As described above, the upward reflection sheet 10 formed by maintaining the horizontal triangular reflection bar 11-1 and the longitudinal triangular reflection bar 11-2 at regular intervals, as shown in FIGS. 2A and 2B, has a space 15. ) May be formed into an open type in which it is drilled up and down, or may be formed in a closed type by forming the bottom surface 16 as illustrated in FIGS. 3A and 3B.

The upward reflection sheet 10 formed as open or closed as described above may be selected and used according to the type and characteristics of the light source 3 to be planted and the use and characteristics of the backlight unit 20 which will be described in detail later. .

The upward reflection sheet 10 in which the space 15 is open is introduced and implanted into the open space 15 when the light source 3 is planted, and the space 15 is closed by the bottom surface 16. The upward reflection sheet 10 formed in a shape is implanted so that the light source 3 is positioned on the upper surface of the bottom surface 16.

In particular, the triangular reflection bar 11 utilized as the transverse triangular reflection bar (11-1) and the longitudinal triangular reflection bar (11-2), as illustrated in Figure 2b, the height (h1) from the bottom to the top vertex 13 ) May be formed to be equal to the length l1 from the center line 0 to one side lower end point 14, or may be formed by making the height h1 larger or smaller than the length l1.

As described above, the height h1 up to the top vertex 13 is equal to the length l1 from the center line 0 to one side bottom vertex 14, or the height h1 is larger or smaller than the length l1. In this case, various kinds of triangular reflection bars 11 having different inclinations of the reflecting slopes 12 may be manufactured.

As described above, when the triangular reflection bar 11 is manufactured by varying the inclination of the reflecting slope 12, the type and characteristics of the light source 3 to be planted and the use and characteristics of the backlight unit 20 which will be described in detail later will be described. You can choose to use it.

The triangular reflection bar 11 utilized as the transverse triangular reflection bar 11-1 and the longitudinal triangular reflection bar 11-2 is formed of a metal such as aluminum, copper, or metal foil (aluminum foil) having excellent thermal conductivity, It can be formed from a polymer or the like.

In particular, when the triangular reflector bar 11 is formed of a polymer, the outer surface of the reflective inclined surface 12 formed on both sides of the center line 0 is coated or laminated with a metal plate and a metal foil having excellent thermal conductivity to improve thermal conductivity. Can be.

The backlight unit 20 is formed as illustrated in FIGS. 4A to 5B by using the upward reflection sheet 10 formed as described above (FIGS. 2A and 2B and FIGS. 3A and 3B).

The backlight unit 20, the upper reflection sheet 10 according to the present invention is bonded (fixed) to the upper surface of the module substrate 4, the upper reflection is bonded (fixed) to the upper surface of the module substrate 4 In each space 15 of the sheet 10, a light source 3 is inserted and implanted.

Since the method of implanting the light source 3 in the upward reflection sheet 10 is performed in the same manner as in the conventional method, description of the specific method for the expression is omitted.

When adhering (fixing) the upward reflection sheet 10 according to the present invention to the upper surface of the module substrate 4 as described above, as shown in Figs. 4b and 4c, each transverse triangular reflection bar 11-1 In the lower side of the longitudinal triangular reflector bar 11-2, the module substrate 4 has a distribution hole 4-1 with a space portion of each of the transverse triangular reflector bar 11-1 and the longitudinal triangular reflector bar 11-2. 11-3) to improve the cooling effect of the upward reflection sheet 10, that is, the horizontal triangular reflection bar (11-1) and the longitudinal triangular reflection bar (11-2).

As the light source 3 implanted in each space 15 of the upward reflection sheet 10 bonded (fixed) to the upper surface of the module substrate 4, as shown in Figs. 6A to 6C, surface mount type LED package (3-1), lead frame type LED package (3-2), direct cooling type LED package (3-3) developed by the person and side view type LED package (3-4) as illustrated in Fig. 4C Etc. can be mentioned.

In particular, the light source 3 implanted in each space 15 of the upward reflection sheet 10 bonded (fixed) to the upper surface of the module substrate 4 has a light source height h2 as illustrated in FIG. 2B. The height h1 of the triangular reflection bar 11 may be maintained the same, or the light source height h2 of the light source 3 may be formed higher or lower than the height h1 of the triangular reflection bar 11. By varying the light source height (h2) as described above it is also possible to manufacture a variety of backlight unit 20 according to the use and characteristics.

An operation relationship of the backlight unit 20 in which the upward reflection sheet 10 is implanted as described above will be described with reference to FIGS. 4A, 4B, and 4C.

In the case where the light source 3 is the surface mount LED package 3-1, the lead frame LED package 3-2, or the direct cooling type LED package 3-3, as shown in Figs. 4A and 4B, Light source light 3-5 and heat generated from the light source 3 implanted in each space 15 of the reflective sheet 10 are emitted and irradiated upward, and the light source 3 is a side view type LED package (3- In the case of 4), as illustrated in FIG. 4C, the light sources 3-5 and heat are radiated and irradiated laterally.

Part of the light source light 3-5 and heat generated from the light source 3 forms a triangular reflector bar 11-1 or a longitudinal triangular reflector bar 11-2, as illustrated in FIGS. 4B and 4C. It is reflected upward by the reflection inclined surface 12 of the reflection bar 11.

Light and heat reflected and reflected by the reflecting slope 12 are reflected by the reflecting slope 12 and rise almost vertically, thus violating the scanning range of the light source light 3-5 generated by the light source 3 or The light source light 3-5 that is scanned while being protected by the reflected light does not interfere with the light source light 3-5 that is scanned by another adjacent light source 3.

Therefore, the reflected light reflected from the reflective inclined surface 12 is raised while wrapping and protecting the outside of the light source light (3-5), the light source light (3-5) is scanned without interference of the reflected light is the backlight unit 20 Scanned to a flat panel display (not specifically shown) to form a, it is possible to improve the color reproducibility of the flat panel display, to prevent the glare of the color and to improve the sharpness.

When the triangular reflector bar 11 is applied with the upward reflection sheet 10 formed of a polymer, the electrical short does not occur even if the upper reflector sheet 10 is in close contact with the top surface, and the direct light type LED is used as the light source 3. If the package (3-3) is used, soldering to the neutral portion of the LED where the LED is mounted can maximize the heat dissipation effect.

On the other hand, the heat generated by the light source 3 is also reflected and raised by the reflective inclined surface 12 of the triangular reflecting bar 11 and is emitted, and remains in the space 15 between the light source 3 and the reflective inclined surface 12. Since some heat is convexed in the space 15 and is reflected and released again (heat convection), the heat exchange phenomenon is rapidly performed, so that heat generated from the light source 3 can be efficiently discharged.

In particular, as illustrated in FIGS. 4B and 4C, the module substrate 4 on which the upward reflection sheet 10 is attached to an upper surface thereof has a horizontal triangular reflection bar 11-1 forming the upward reflection sheet 10. Since the distribution holes 4-1 are drilled to communicate with the space portion 11-3 of the longitudinal triangular reflector bar 11-2, heat is transferred to the horizontal triangular reflector bar 11-1 and the longitudinal triangular reflector bar 11-2. The internal air of the space portion 11-3 is heated by heat, and the internal air of the space portion 11-3, which is heated by heat, is convection and blows out through the flow hole 4-1 of the module substrate 4. Is exchanged with

Therefore, the heat applied to the horizontal triangular reflector 11-1 and the longitudinal triangular reflector 11-2 is caused by convection (thermal convection) occurring on the surface and the distribution hole of the module substrate 4 (4-1). Cooling by the external air exchanged through) can greatly improve the cooling effect.

In addition, even when the light sources 3 are connected in series, as illustrated in FIGS. 5A and 5B, using the heathink 5 together with the upward reflection sheet 10 according to the present invention, the connection Cu Since the upper and lower surfaces do not generate a potential difference at all, the presence of Cu surfaces is possible. Therefore, even if a metal plate is attached to the entire module substrate or a conductive heat-dissipating sheet is used, no short occurs. It becomes possible.

Although the present invention has been described in detail only with respect to the specific embodiments described, it will be obvious to those skilled in the art that various modifications and changes can be made within the technical scope of the present invention, and such modifications and modifications belong to the appended claims. will be.

1A to 1D are exemplary views showing a state in which a light source is installed using a conventional flat reflective sheet and a state in which light sources are connected in series using a heath sink.

2a and 2b is a partial perspective view and a cross-sectional view showing an upward reflection sheet according to the present invention.

3a and 3b is a partial perspective view and a sectional view showing another embodiment of an upward reflection sheet according to the present invention.

Figures 4a and 4b is an exemplary view showing the state of forming a unit for the backlight using the upward reflection sheet according to the present invention and an operational relationship explanatory drawing.

5A and 5B are exemplary views illustrating a state in which light sources are connected in series using a heat sink together with an upward reflection sheet in the backlight unit according to the present invention.

6A to 6C are exemplary views showing different light sources installed on a module substrate together with an upward reflection sheet in the backlight unit according to the present invention.

Explanation of symbols on the main parts of the drawings

1: Reflective sheet 2: Flat type reflective sheet 3: Light source

4. Module board 10: Upward reflection sheet 11: Triangular reflection bar

12: Reflective surface 15: Space 16: Bottom

20: backlight unit

Claims (14)

delete delete delete delete delete delete delete delete delete In the backlight unit having an upward reflection sheet attached to the module substrate on which the light source is implanted, It is attached to the upper surface of the module substrate and the triangular reflective bar is formed by the cross repeatedly crosswise and vertically formed; And a light source formed in a space between the triangular reflection bars repeatedly formed in the vertical and horizontal directions in the upward reflection sheet. And a distribution hole formed in the module substrate so as to communicate with the space portion of the triangular reflection bar repeatedly formed horizontally and vertically. The method according to claim 10, wherein the light source implanted in the upward reflection sheet; And any one of a surface mount LED package, a lead frame LED package, a direct-cooling LED package, and a side view type LED package. The method according to claim 10, Upward reflection sheet is attached to the upper surface of the module substrate and the triangular reflection bar is formed by repeatedly crossing the transverse and longitudinal, The light source is formed in the space between the triangular reflection bar is repeated in the horizontal and vertical in the upward reflection sheet; Making the height of the light source of the light source the same as the height of the triangular reflection bar; The height of the light source of the light source is higher than that of the triangular reflection bar; The light source height of the light source is lower than the height of the triangular reflector; The backlight unit, characterized in that any one of. delete The backlight unit according to claim 10, wherein a light source formed by attaching a metal plate made of a plate or a conductive heat dissipation sheet is attached to the entire module substrate.

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