JP2533024B2 - Incident light supply device for edge light panel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edge light panel lighting device, and more particularly to an incident light supply device for the edge light panel.

[0002]

2. Description of the Related Art An edge light panel illuminating device supplies light from a primary light source to an incident end surface of an edge light panel so that a diffused reflection surface of the edge light panel emits secondary light. Examples of the incident light supply device include, for example, No. Shokai 32-33108 and No. Hei 1
No. 90085, JP-A-2-32320, etc. are known, and according to these, in general, this incident light supply device is
A C-shaped or U-shaped lamp house that covers the primary light source facing the incident end face of the edge light panel in the longitudinal direction is used. With this lamp house, the incident end face side of the source light on the outer periphery of the primary light source non-opposing side It is supposed that the amount of incident light is increased by promoting the reflection to the.

Japanese Utility Model Laid-Open No. Sho 63-33108 uses a C-shaped lamp house.
The U.S. Pat. No. 2,320,320 uses a U-shaped lamp house, and the tip of the U-shaped lamp house is placed so as to abut the front and back edges of the incident end face of the edge light panel. A lamp house is used and a prism is provided between the incident end face of the edge light panel and the primary light source.

[0004]

The edge light panel lighting device is widely used as, for example, a liquid crystal backlight instead of the direct type lighting device because it has a feature that it is compact and can obtain uniform brightness.

However, when this edge light illuminating device is used as a liquid crystal backlight today, the liquid crystal display surface is limited to a monochrome display surface. For example, when the liquid crystal display surface is used for a color display surface, insufficient brightness is remarkable. Yes, it is hard to say that it can be put to practical use.

Generally, the average brightness obtained by this kind of edge light panel lighting device is 950 to 1,150 cd.
/ M ^2, although the luminance is no practical problem with respect to monochrome display surface, because the color display surface of at least 2-fold or increase more brightness is needed.

Brightness can be improved by, for example, increasing the number of primary light sources, but since the liquid crystal backlight is mounted and used in devices such as a television receiver, a computer and a word processor, it is generally indispensable to make it as compact as possible. In addition, it is indispensable to save power as much as possible due to the increasing trend of portable type. For example, one side light source by a single primary light source and both side light sources by both side primary light sources must be improved within the current range. There will be a constraint that it will not happen.

The brightness may be further improved by improving the edge light panel, but increasing the amount of incident light is an effective brightness improving means. Although it has a certain effect as compared with the case of not using, it is difficult to exceed the current brightness.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an incident light supply device that realizes a dramatic improvement in average luminance under the above-mentioned restrictions.

[0010]

[Means for Solving the Problems] As a result of repeated intensive research on the above problems, the incident light supplied to the incident end surface of the edge light panel diffuses the light from the light source before the incident as non-directionally as possible. reaches on the finding of the fact that it allowed to incident may make effective brightness enhancement in the, also be interposed a mirror frame below between edges incident end face of the light panels and the primary light source for this purpose, even in this It has been found that it is extremely effective to construct the lamp house used in a tapered U shape.

Based on such knowledge, the present invention diffuses the light source light of the primary light source over the entire length in the longitudinal direction on the incident end face side of the edge light panel at the position between the primary light source and the edge light panel as much as possible. The diffuse reflection means for supplying the incident light from the incident end face later is arranged, that is, in the present invention, a large number of penetrating sections are continuously arranged in the longitudinal direction of the incident end surface of the edge light panel and the penetrating sections of these penetrating sections are arranged. A mirror frame having an inner peripheral surface as a mirror surface is formed, and the mirror frame is interposed between an incident end face of the edge light panel and a primary light source facing the incident end face. Incident light supply device (Claim 1), the mirror frame according to Claim 1 are integrally or integrally formed with a lamp house that covers a primary light source in a longitudinal direction. An incident light supply device for an edge light panel (claim 2) which is formed and a lamp house according to claim 2 are opposed to an incident end face of the edge light panel.
The outer periphery of the primary light source on the non-opposing side is C-shaped or U-shaped in the longitudinal direction.
And is tapered toward the incident end face side.
And a pair of light source light guide fins are formed in a tapered U shape, and the tips of the pair of light source light guide fins are integrally or integrally formed so as to abut the mirror frame. According to another aspect of the present invention, there is provided an incident light supply device for an edge light panel (claim 3 ), which is the subject matter of the invention.

[0012]

According to the first aspect of the present invention, each penetration section of the mirror frame promotes diffuse reflection of light from the light source.
It is supplied to the incident end face as incident light, and claim 2 further prevents loss of light from the light source, and claim 3 further promotes diffuse reflection of the light from the light source by the mirror frame and the tapered U-shaped lamp house. The light is supplied to the incident end face as light, and in each case, the diffuse reflection in the edge light panel is greatly increased immediately after the incidence, thereby improving the brightness.

[0013]

EXAMPLES The present invention will be described in more detail with reference to the drawings showing the following examples. In FIGS. 1 to 4, A is a liquid crystal backlight by an edge light illuminating device, and this liquid crystal backlight A is shown in the drawing. It is used for installation by being installed in equipment such as a television receiver, computer, and word processor so that it is installed on the back side of the omitted liquid crystal display surface.

In the liquid crystal backlight A, a milky white polyester film 1 for light diffusion, an edge light panel 2 and a white polyester film 9 for light reflection are arranged in layers from the liquid crystal display surface side, and the edge light panel 2 is arranged.
Of the primary light source 10, the incident light supply device B, and the edge light panel 2 which are arranged to face the incident end face of the above, and a reflection means 11 by a white resin tape integrally attached in a surrounding shape using a transparent adhesive. is there.

The edge light panel 2 is a 6 mm thick 1
Acrylic transparent substrate 3 having horizontal dimensions of 30 × 240
The diffused reflection pattern 5 is formed by screen printing so as to cover substantially the entire rear surface of the edge light panel, that is, the non-liquid crystal display surface side. In this example, a single edge light panel 2 is used. .

The irregular reflection pattern 5 is formed by gradually increasing the area ratio of the halftone dots of the irregular reflection unit so that the amount of irregular reflection is gradually increased from the end portion in the in-plane direction. A halftone dot which is divided into an adjusted irregular reflection portion 7 on the side of the reflection means 11 and a maximum irregular reflection portion 8 in which the irregular reflection amount is commonly maximized at a position deviated toward the reflection means 11 side between them. The incident light diffused reflection portion 6 diffuses the incident light and the adjustment diffused reflection portion 7 reflects the incident light and the reflection means 1.
Diffuse the composite light with the reflected light from 1 in the suppressing direction to adjust the non-uniformity due to the high brightness of the composite light of the part,
Further, the maximum diffused reflection portion 8 diffuses the light amount reduction portion between them to the maximum extent and is capable of performing back illumination with high brightness and high uniformity as a whole.

In the present example, the primary light source 10 is, for example, a single cold-cathode tube with power saving of 2 to 4 W, and the primary light source 10 is opposed so as to extend over the entire length of the incident end face 4 of the edge light panel 2 in the longitudinal direction. Thus, the liquid crystal backlight A is configured as an edge light illuminating device for one side light source.

The incident light supply device B is, in this example, a mirror frame 20 provided between the incident end surface 4 of the edge light panel 2 and the primary light source 10, and a U-shaped lamp integrally formed with the mirror frame 20. And a house 30.

That is, the mirror frame 20 has a plurality of penetrating sections 21 continuously arranged in the longitudinal direction of the incident end surface of the edge light panel 2 and has an inner peripheral surface of these penetrating sections 21 as a mirror surface 23 in the form of a multi-section frame. In this example, the mirror frame 20 uses a frame main body in which the partition wall 22 is made as thin as possible by extrusion molding of aluminum or injection molding of synthetic resin. In this case, the inner height H is preferably the edge light panel 2 in a preferable mode.
The same as the above-mentioned inner height H so that the inner width W is within 1.5 times, more preferably within 1.4 times the wall thickness of the edge light panel 2 of the preferred embodiment while being equal to the wall thickness. In addition, by making the thickness of the edge light panel 2 to be equal to that of the edge light panel 2, the edge light panel 2 is configured as a square grid with an opening area as large as possible.

For this frame body, for example, silver,
The inner peripheral surface of the penetrating section 21 is formed as a mirror surface 23 by vapor deposition or metal plating of aluminum or the like.

On the other hand, the lamp house 30 includes the primary light source 10
Is a U-shaped member that covers in the longitudinal direction, and is provided with a pinching fin 31 whose tip extends in parallel. The pinching fin 31 is used to pinch the mirror frame 20. The inner surfaces that cover the primary light source 10 are mirror surfaces similar to those described above.

In the incident light supply device B of the present example, the primary light source 10 is inserted and installed in the lamp house 30 so that the primary light source 10 and the edge light panel 2 incident end face 4 are not too far apart from each other. The primary light source 10 is arranged such that the distance L is 1.5 times, more preferably 1.4 times or less, the wall thickness of the edge light panel 2 of the preferred embodiment.

In the liquid crystal backlight A of this example, the light source light of the primary light source 10 travels to the penetrating section 21 of the mirror frame 20 and is reflected by the lamp house 30 to the penetrating section 21 of the mirror frame 20. As it advances, the mirror surface 23 diffuses non-directionally, and the mirror surface 23 of the lamp house 30 and the mirror frame 20 causes the entire amount of the light source light to be incident light of the edge light panel 2 without loss. It is supplied to the incident end face 4. Therefore, the incident light is sequentially supplied to the irregular reflection pattern 5 of the edge light panel 2 as non-directional light having no directivity in a specific direction, and diffuse reflection on the edge light panel 2 is greatly promoted to improve the brightness. In the present example, the luminance was about 1,800 cd / m ² , which was about 60% higher than that of the conventional incident light supply device.

FIG. 5 shows another example of the incident light supply device B. In this example, the outer periphery of the primary light source 10 on the non-opposing side is covered with a C shape in the lamp house 30. The pair of light source light guide fins 32, which are inclined and tapered toward the incident end face 4 side of the edge light panel 2, are arranged as a tapered U-shape, while the upper and lower sides of the mirror frame 20 are similarly arranged on the incident end face 4 side. The tip of the light source light guide fin 32 is similarly pressure-bonded to the top and bottom of the mirror frame 20.

Although the rest is configured in the same manner as described above, when the incident light supply device B of this example is used, diffuse reflection of the light source light is further promoted, and a brightness improvement of about 70%, which is higher than the above, is obtained.

Further, FIGS. 6 to 8 show the mirror frame 20.
2 is an example in which the shape of the penetration section 21 in FIG.
Figure 6 is an example of an enlarged as a through compartment 21 cylindrical, the opening area as possible as triangular in its corners, Fig 7
8 shows an example in which the penetrating section 21 has a triangular shape and is arranged in the forward and reverse order to expand the opening area as much as possible, as shown in FIG.
Shows an example in which the penetrating section 21 has a polygonal shape and an I-shaped section between the penetrating sections 21 and the opening area is enlarged as much as possible, and these can also obtain good results as in the above.

Although the illustrated example is as described above, the incident light supply device of the present invention can be configured by using the mirror frame alone or in combination with the conventional lamp house or the like. In order to prevent the loss of light from the light source as much as possible and make it efficiently incident light, the mirror frame should be formed integrally or integrally with the lamp house as the incident light supply device as in the above example. Is particularly preferable.

It is preferable that the mirror frame is installed so as to cover the entire length in the longitudinal direction of the incident end face of the edge light panel. At this time, in addition to the above example, the penetrating section is, for example, a square or rectangular grid having two upper and lower stages. By doing so, it is also possible to arrange the penetrating sections with different dimensions. However, making it too complicated or thickening the wall thickness of the partition wall between the through sections should be avoided because it reduces the overall opening area. Therefore, for example, omitting the I-shaped through section in FIG. Therefore, it is not preferable to use only the polygonal through section.

As described above, the size of the through section is equivalent to the inner height with respect to the thickness of the edge light panel, that is, the thickness at the incident end face, and the inner width is within 1.5 times, more preferably Since it is possible to obtain particularly good results, it is preferable that the distance between the primary light source and the incident end face is within 1.5 times, more preferably within 1.4 times. It is preferable to set each penetration section and depth in the mirror frame accordingly.

The mirror surface of the mirror frame has a mirror shape with a reflectivity as high as possible. For example, it is necessary to avoid unevenness on the mirror surface because it hinders the progress of light from the light source toward the incident end surface. Is preferred. The mirror surface can also be formed by stretching a metal foil, a thin glass mirror, etc., but it is simple to use the above vapor deposition or plating, and the mirror frame or its body can also be constructed by assembling individual members. However, the above molding is convenient for obtaining a simple and accurate product.

[0031] The tapered U-shaped lamp house is also the mirror off
The light source light guide fins can be configured to conform to the Laem, but the light source light guide fins can secure the distance between the primary light source and the incident end face without making the length too long.

One of the pair of guide fins is horizontal,
It is possible to tilt the other, but it is more preferable to tilt both.

[0033] In forming the tapered U-shaped lamp house mirrored frame integrally or integrally it may also be a horizontal one without a mirror frame and tapered well.

As can be seen from the above, the edge light illuminating device is applied to something other than the liquid crystal backlight, in this case, the edge light panel is laminated, and the wall thickness of the incident end face is adjusted accordingly. In implementing the present invention, the mirror frame is constructed based on the laminated thickness, the diffuse reflection surface of the edge light panel is formed into a different pattern, and it is formed by other means such as shot plast. Specific shapes, structures, dimensions, materials, production methods, etc. of panels, mirror frames, penetrating sections, mirror surfaces, U-shaped lamp houses, light source light guide fins, and the like, and additions thereof are not contrary to the gist of the above invention. As long as it can be variously modified, it is not limited to those shown or described above.

[0035]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the light source light of the primary light source is diffusely reflected between the incident end faces of the edge light panel as much as possible, and then is supplied to the incident end face as incident light. Therefore, the diffuse reflection of the edge light panel can be greatly increased immediately after the incidence, and the brightness of the edge light panel can be increased to several pick-up% or more.
As a result, for example, it is possible to greatly improve it by 60% or 70%.

Therefore, even if the liquid crystal backlight is made as compact as possible and power is saved, the average brightness can be dramatically improved. It is possible to open the way to the use as a liquid crystal backlight for the liquid crystal display surface.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a liquid crystal backlight.

FIG. 2 is a perspective view of an incident light supply device.

FIG. 3 is a partially enlarged vertical sectional view of a liquid crystal backlight.

FIG. 4 is a partially enlarged front view of a mirror frame.

FIG. 5 is a perspective view of an incident light supply device according to another example.

FIG. 6 is a partially enlarged front view of a mirror frame according to another example.

FIG. 7 is a partially enlarged front view of a mirror frame according to another example.

FIG. 8 is a partially enlarged front view of a mirror frame according to another example.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-238490 (JP, A) JP-A-3-191328 (JP, A) JP-A-1-245220 (JP, A) Actual development Sho-63- 118002 (JP, U)

Claims (3)

(57) [Claims] 1. An edge light panel, wherein a large number of through sections are continuously arranged in a longitudinal direction of an incident end surface of the edge light panel, and a mirror frame having an inner peripheral surface of these through sections as a mirror surface is formed. 2. An incident light supply device for an edge light panel, characterized in that it is interposed between an incident end face of and a primary light source facing the incident end face. 2. An incident light supply device for an edge light panel, wherein the mirror frame of claim 1 is integrally or integrally formed with a lamp house that covers a primary light source in a longitudinal direction. 3. A lamp house of claim 2, Ejjirai
Outer periphery of the primary light source facing the incident end face of the panel
The C-shaped or U-shaped longitudinal direction and
A pair of light source light guides that are tapered toward the end faces
Tapered and U-shaped comprising brought arranged fins, the incident light supply device for an edge light panel, characterized in that formed by integrally or integrally so as to contact the tips of the pair of the source light guide fins on the mirror frame .