KR101171546B1 - Edge type Backlight unit - Google Patents

Edge type Backlight unit Download PDF

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Publication number
KR101171546B1
KR101171546B1 KR20100071213A KR20100071213A KR101171546B1 KR 101171546 B1 KR101171546 B1 KR 101171546B1 KR 20100071213 A KR20100071213 A KR 20100071213A KR 20100071213 A KR20100071213 A KR 20100071213A KR 101171546 B1 KR101171546 B1 KR 101171546B1
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KR
South Korea
Prior art keywords
light
guide plate
light guide
diffusion
side
Prior art date
Application number
KR20100071213A
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Korean (ko)
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KR20120009209A (en
Inventor
전복수
Original Assignee
희성전자 주식회사
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Priority to KR20100071213A priority Critical patent/KR101171546B1/en
Publication of KR20120009209A publication Critical patent/KR20120009209A/en
Application granted granted Critical
Publication of KR101171546B1 publication Critical patent/KR101171546B1/en

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Abstract

The present invention relates to a side dimming type backlight device in which a plurality of LEDs are disposed on one side of the light guide plate, the reflection film being disposed above the light incident part of the light guide plate to allow light leaking upward into the light guide plate; And a diffusion member interposed between the reflective film and the light guide plate to diffuse upwardly leaking light in the left and right directions. As a result, it is possible to minimize the luminance deviation caused by the dark portion generated by the light generated by the strong light of the light emitting diode light source and the weak light between the light source, thereby improving the lighting defect in the light incident region.

Description

Side type backlight unit {Edge type Backlight unit}

The present invention relates to a side-illuminated backlight device, and more particularly, to minimize the luminance deviation caused by the dark portion generated by the weak light between the light source and the light source generated by the strong light of the light emitting diode light source in the light incident region It relates to a side-illuminated backlight device that can improve the.

BACKGROUND ART A backlight device using a light emitting diode (LED), which has recently been in the spotlight, is a liquid crystal panel of a liquid crystal display device using a direct lighting type or an edge lighting type. Illuminate. The direct dimming method is a method of directly illuminating and illuminating a liquid crystal panel through an optical sheet from a lower light source. The side dimming method is a method of illuminating a liquid crystal panel by injecting light from a light source into the side surface of the light guide plate and changing the direction upward.

1 is a partial cutaway side cross-sectional view of a side dimming backlight device according to the prior art. As can be seen from this figure, in the conventional side-illumination type backlight device, an LED array in which the LED 2 as a light source is attached to the substrate 3 is inserted into the light incident portion of the plate bottom 1, and the LED 2 The light guide plate 5 is disposed at the front side of the light guide plate 5, and the support main 7 is fastened to the plate bottom 1 to fix the light guide plate 5 at an upper side thereof. In addition, a reflection sheet 4 is provided below the light guide plate 5 to reflect light leaking downward to the upper side, and the light leaking on the LED 2 and the light guide plate 5 inside the light guide plate 5. The reflective film 6 for reflecting to form a structure is arranged.

In such a structure, the light emitted from the LED 2 is incident into the light guide plate 5, and the light incident into the light guide plate 5 is converted into the light of the surface light source by total reflection or refraction and is emitted back to the upper side to provide a backlight. It will function. At this time, the light leaking to the light incident portion of the light guide plate 5 is incident to the light guide plate 5 by the reflective film 6, as shown, is configured to increase the brightness.

In the side-illumination type backlight device, a plurality of LEDs 2 are disposed on the substrate 3 spaced apart at regular intervals, and each of the LEDs 2 emits light having a predetermined direction angle in the plane direction of the light guide plate. In this case, in the light-receiving part region of the light guide plate 5, as shown in Fig. 2, the light A occurs due to the strong light in the portion where the LED 2 is disposed, and the LED 2 is not disposed. In the part, the dark part B by the relatively weak light is generated. Luminance deviation occurs due to the light and dark portions, and thus there is a problem in that uniform backlight illumination in the light incident region cannot be achieved.

The present invention has been proposed to solve the above problems, in the side-illumination type backlight device, in order to reflect the light leakage to the inside of the light guide plate through the diffusion member between the reflecting film and the light incident portion of the light guide plate, LED Since the light emitted from the light is diffused into the light guide plate while being diffused in a wide direction in the left and right direction, the luminance deviation caused by the structure in which the LEDs are spaced at regular intervals can be eliminated, thereby improving the appearance in the light incident region. It is an object to provide a side-illuminated backlight device.

In order to achieve the above object, the present invention provides a side-illuminated backlight device in which a plurality of LEDs are disposed on one side of the light guide plate, and is disposed on the light incident part of the light guide plate to reflect the light leaking upward into the light guide plate. film; And a diffuser or a diffused bead is added to diffuse the upwardly leaking light in the left and right directions, and a prism or a cylindrical light pattern is formed on a lower surface thereof, and one end thereof extends to at least the exit surface of the LED. And an end portion interposed between the reflective film and the light guide plate so as to overlap an end portion of the light guide plate.

In the above-described configuration, the diffusion member is characterized in that it is composed of any one of a diffusion pattern, a coated diffusion coating layer, and a resin film formed on the lower surface of the reflective film.

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According to the present invention having the above configuration, the light emitted from the LED is diffused into the light guide plate by the diffusion member interposed between the light guide plate and the reflective film at a wide direction angle in the left and right direction, thereby eliminating the luminance deviation caused by the light and dark portions. The appearance at the light incident part can be improved.

1 is a partial cutaway side cross-sectional view showing a light incident portion of a side-illumination backlight device according to the prior art;
Fig. 2 is a plan view of Fig. 1,
3 is a partial cross-sectional side view of the side-illumination backlight device according to an embodiment of the present invention, a view showing the light incident portion in detail;
4 is a plan view of Figure 3, a plan view showing the optical characteristics of the side-illumination backlight device according to an embodiment of the present invention,
5A is an enlarged side view illustrating a reflective film, a diffusion member according to a first embodiment, and an LED;
5B and 5C are partially enlarged side cross-sectional views showing the shape of a diffusion pattern of the diffusion member;
FIG. 6 is a bottom view of FIG. 5A and illustrates a bottom view of a diffusion member using a diffusion pattern according to an exemplary embodiment of the present invention.
7 is a side view showing a diffusion member using a diffusion layer according to a second embodiment of the present invention;
8 is a side view showing a diffusion member using a resin film according to a third embodiment of the present invention;
9 is a side view and a partially enlarged side cross-sectional view showing a diffusion member using a resin film according to a fourth embodiment of the present invention;
10 to 12 are bottom and side views showing the shape of the diffusion member according to various other embodiments of the present invention.

The technical problem achieved by the present invention and the practice of the present invention will be apparent from the preferred embodiments described below. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a partial cutaway side cross-sectional view illustrating a light incident part of a side dimming backlight device according to an embodiment of the present invention, and FIG. 4 is a plan view of FIG. 3, showing optical characteristics of the side dimming backlight device according to an embodiment of the present invention. The figure shown. In the backlight device of the present invention, as can be seen in these figures, the reflecting sheet 20, the LED array 30, the light guide plate 40 and the reflecting film 50 are sequentially arranged inside the plate bottom 10. Is inserted. A support main 70 is disposed above the reflective film 50 to be fastened to the plate bottom 10 to stably fix the light guide plate 40. The diffusion member 60 is interposed between the reflective film 50 and the light guide plate 40.

The plate bottom 10 is coupled to the support main 70 to store components constituting the backlight device therein. The light incident part side has a 'c' shape for accommodating the LED array 30, and the support main 70 is formed in a flat shape.

The LED array 30 is a light source of a backlight device, and a plurality of LEDs 31 are arranged at regular intervals on the substrate 32, and a main window of the LEDs 31 is disposed to face the light guide plate 40. The light is emitted at a directed angle.

The light guide plate 40 is configured to convert the light of the point light source incident from the LED into a surface light source, and totally reflects and refracts the light incident therein to be emitted to the entire surface of the light guide plate. The light guide plate 40 is mainly formed of a resin such as PMMA in a rectangular flat plate shape.

The reflective sheet 20 and the reflective film 50 are configured to improve brightness by injecting light leaking outside into the light guide plate 40. The reflective sheet 20 is disposed on the upper surface of the plate bottom 10, that is, the lower portion of the light guide plate 40, and reflects the light emitted from the lower portion of the light guide plate 40 to total reflection and refraction inside the light guide plate 40. Induces the light guide plate 40 to exit. The reflective film 50 is disposed between the upper horizontal portion 10a of the plate bottom 10, the LED array 30, and the light guide plate 40 in the light incident region. Light emitted from the LED 31 and not incident to the light guide plate 40 but exited to the upper side or emitted from the light incidence part to the upper side of the light guide plate 40 is reflected by the reflective film 50 and is induced to enter the light guide plate. . The reflective film 50 is made of a film of a material such as PET or acrylic.

As shown in FIG. 4, the diffusion member 60 is disposed between the reflective film 50 and the light guide plate 40. The diffusion member 60 diffuses the light reflected from the reflective film 50 at a wide direction angle in the left and right directions. As a result, light is diffused into the light guide plate 40, and as a result, as shown in the drawing, the division of the arm portion B ′ is almost eliminated. That is, the light leaking toward the light guide plate 40 of the light incident part is simultaneously reflected and diffused, and is incident again into the light guide plate 40, thereby minimizing the luminance deviation caused by the light beam A ′ and the dark part B ′. The appearance of light in the light incidence region of the light guide plate 40 can be improved.

5 through 9 are views illustrating a diffusion member according to various embodiments of the present disclosure. As illustrated in FIGS. 5 and 7, the diffusion pattern 61 or the reflective layer 62 is directly disposed on the lower surface of the reflective film 50. This may be formed integrally with the reflective film 50, or may be composed of a separate resin film 63, as shown in FIG.

First, referring to FIGS. 5A through 5C, the integrated diffusion member 60 including the diffusion pattern 61 will be described. The prism or cylinder-shaped diffusion pattern may be formed on the lower surface of the reflective film 50. 61 is formed so that the light reflected from the reflective film 50 is diffused to the left and right by the diffusion pattern 61.

Looking at the diffusion pattern 61 in detail, the prism-shaped diffusion pattern 61 is shown in Figure 5b, the height (H1) of the prism pattern 61 is 3㎛ to 300㎛, intervals P1 Is formed from 1 μm to 1000 μm. At this time, the prism pattern 61 is continuously formed as (A) in a range in which one side length (L1 = H1 x tanθ1) is larger than 0 and smaller than the interval P1 between the patterns, or discontinuously as (B). Is formed.

In addition, in the cylindrical diffusion pattern 61, as illustrated in FIG. 5C, the height H2 of the cylinder pattern 62 is 3 μm to 300 μm, and the interval P2 is formed to be 1 μm to 1000 μm. . In this case, the cylinder pattern 62 is formed continuously or discontinuously in a range in which one side length L2 = H2 x sinθ2 / (1-cosθ2) is greater than 0 and smaller than the interval P1 between the patterns. As shown in FIG. 6, the diffusion pattern 61 having the shape may be formed in a horizontal direction or a vertical direction with respect to the traveling direction of light.

Referring to FIG. 7, referring to the integrated diffusion member 60 including the reflective layer 62, a diffusion layer 62 using a diffusion material or diffusion beads is formed on the lower surface of the reflective film 50. The light reflected from the reflective film 50 is diffused to the left and right by the diffusion layer 62.

The diffusion layer 62 may be integrally formed with the reflection film 50 by coating a diffusion material or a resin to which diffusion beads are added to one surface of the reflection film 50 using a PET film or the like as a base film. In addition, a protective layer (not shown) is formed on the diffusion layer 62.

Looking at the separation type diffusion member 60 with reference to Figure 8, it is composed of a reflective film 50 and a separate resin film (63). As the resin film 63 according to the embodiment of the present invention, a material such as PET, PC, PMMA, Acetate, or Acryl may be used. To the resin film 63, a diffusion material or diffusion beads for diffusing light efficiently can be added. As such, the resin film containing the diffusion material or the diffusion type beads is interposed between the reflective film and the light guide plate, so that the light reflected by the reflective film 50 diffuses in the left and right directions while passing through the resin film 63 and into the light guide plate. Incident.

On the other hand, in order to further increase the light diffusion efficiency on the lower surface of the resin film 63, as shown in FIG. 9, a prism shape or a cylindrical light pattern 64 may be further formed. As the light passes through the resin film 63 to which the diffusion material or the diffusion bead is added, light may be first diffused, and then may be secondarily diffused by the light pattern 64 on the bottom surface of the resin film. The prism or cylindrical light pattern 64 may be formed continuously or discontinuously in a shape as shown in FIGS. 5B and 5C, and may be formed in a horizontal direction or a vertical direction with respect to the traveling direction of light. have.

The diffusion member 60 using the resin film 63 may be separately inserted between the reflective film 50 and the light guide plate 40 during the assembling process. However, the diffusion member 60 may be attached to the bottom surface of the reflective film 50 using an adhesive. In this case, the process can be made easier.

10 to 12 are bottom and enlarged side cross-sectional views illustrating the shape of a diffusion member according to various embodiments of the present disclosure. First, referring to the diffusion member 60 according to the embodiment of FIG. 10, the diffusion member 60 is formed on the entire lower surface of the reflective film 50. That is, the diffusion pattern 61 or the diffusion layer 62 having the same area as the reflective film 50 is formed to cover all of the LED 31 and the light guide plate 40 in the light incident region below the reflective film 50, The resin film 63 having the same area as the reflective film 50 may be disposed. The diffusion member 60 having such a shape has an advantage of diffusing all the light reflected through the reflective film 50.

And, looking at the diffusion member 60 according to the embodiment of Figure 11, the diffusion member 60 is formed on a portion of the lower surface of the reflective film 50. That is, it may be formed on a portion of the bottom surface of the reflective film 50 so as to cover the light guide plate 40 of the light incident part area with respect to the front of the LED 31 spaced apart from the LED 31 by a predetermined interval. Here, the distance d between the LED 31 and the diffusion member 60 should be formed within at least 4 mm so that the light emitted from the LED 31 can be sufficiently diffused. The diffusion member 60 having such a shape can diffuse all the light emitted to the front of the LED 31, and relatively less material is consumed in forming the diffusion member 60 than in the first embodiment.

In addition, referring to the diffusion member 60 according to the embodiment of FIG. 12, the diffusion member 60 is formed separately with respect to each LED 31 in front of the LED 31. That is, it is formed in front of the LED 31 is spaced apart from the LED 31 at a predetermined interval, it is formed separately to correspond to each LED 31 disposed at a constant interval. Here, the distance d between the LED 31 and the diffusion member 60 should be formed within at least 4 mm so that the light emitted from the LED 31 can be sufficiently diffused. The diffusion member 60 may diffuse light emitted toward the front of each LED 31, and may form the diffusion member 60 using a minimum material.

On the other hand, the diffusion member 60 according to the embodiment of FIG. 12 is preferably formed in a trapezoidal shape that is wider toward the light guide plate 40 side from the LED 31 side. The light emitted from the LED 31 has a predetermined direction angle θ in the left and right directions, and is formed in a trapezoidal shape corresponding to the direction angle θ, so that light can be efficiently diffused.

As described above, the side dimming type backlight device according to the embodiment of the present invention is a light diffusion plate intervening between the reflective film and the light guide plate, the light leaking to the upper side is reflected and diffused at the same time is incident to the light guide plate at a wide direction angle, The luminance deviation caused by the dark portion can be eliminated.

Although the embodiments of the present invention have been described with reference to the present invention, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the scope of the present invention is not limited thereto, but various modifications and improvements of those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

10: plate bottom 20: reflective sheet
30: LED array 40: light guide plate
50: reflective film 60: diffusion member
61 diffusion pattern 62 diffusion layer
63: resin film 64: light pattern
70: support main

Claims (4)

  1. In the side light type backlight device, a plurality of LEDs are arranged on one side of the light guide plate,
    A reflection film disposed on the light incidence portion of the light guide plate to allow light leaking upward into the light guide plate; And
    In order to diffuse the upwardly leaking light in the left and right direction, a diffusion material or a diffusion bead is added, and a prism or a cylindrical light pattern is formed on a lower surface thereof, and one end thereof extends at least to the exit surface of the LED and the other end thereof. And a diffusion member interposed between the reflective film and the light guide plate so as to overlap an end portion of the light guide plate.
  2. The method of claim 1, wherein the diffusion member,
    Side dimming type backlight device, characterized in that consisting of any one of a diffusion pattern, a coated diffusion coating layer, and a resin film formed on the lower surface of the reflective film.
  3. delete
  4. delete
KR20100071213A 2010-07-23 2010-07-23 Edge type Backlight unit KR101171546B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR20100071213A KR101171546B1 (en) 2010-07-23 2010-07-23 Edge type Backlight unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR20100071213A KR101171546B1 (en) 2010-07-23 2010-07-23 Edge type Backlight unit

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KR20120009209A KR20120009209A (en) 2012-02-01
KR101171546B1 true KR101171546B1 (en) 2012-08-06

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