JPH02269382A - Surface light source panel for one-side light source - Google Patents

Abstract

PURPOSE:To obtain much brighter and uniform luminance by arranging the part having a maximum area ratio of an irregular reflection layer in a position, which is made deviated to the opposite end face of a primary light source, and decreasing the area ratio of the irregular reflection layer symmetrically in the manner of no stage in both side direction from the deviated position. CONSTITUTION:A maximum area ratio part 20 of an irregular reflection layer 18 is arranged in the position, which is deviated from a central position to an end reflection part 14 side, between a primary light source 13 and the end reflection part 14 in the other end face side and the area ratio of the irregular reflection layer 18 is symmetrically decreased in the manner of no stage in the both side direction from the deviated position. Thus, light incident by the primary light source 13 advances in a panel by the irregular reflection layer 18, for which the area ratio is increased in the manner of no stage in the beginning, and the surface of the panel is brightly lighted up. On the other hand, in the side of the end reflection part 14 rather than the maximum area ratio part 20, the composite light quantity of the incident light, which advances forward while being reduced, and light reflected by the end reflection part 14 is adjusted by the irregular reflection part 18, which is reversely decreased in the manner of no stage, and the panel is brightly lighted up. Then, uniformity is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application] The present invention relates to a surface immersion source panel that can be widely used, for example, as a backlight for a liquid crystal display device, a billboard, a sign, etc. The present invention relates to a surface light source panel for one-sided light source, which is arranged on six sides.

[Prior art*] Regarding this type of surface light source, the present inventors have developed a special
Excellent in brightness and uniformity according to No. 208670,
We have already proposed a bright and highly practical high-brightness surface light source and panel.

According to this, the arrangement of the diffused reflection part in a surface light source panel in which fine dot-like or linear diffused reflection parts are formed on a transparent resin substrate in a stepless manner so that the area ratio increases in inverse proportion from the end light source position. The brightness 2 uniformity of the surface light source panel is obtained by determining the density, the ink concentration when printing, the additive content, the range of the number of laminated layers, etc.

[Problem to be solved by the invention] As shown in the specification, the above inventors' proposal solves the following problems:
Although the inventors obtained excellent results in dramatically increasing the brightness and uniformity of this type of surface light source panel, the inventors also
For example, we attempted to improve a surface light source panel for a one-sided light source that is suitable as a backlight for a liquid crystal display board in an OAg device.

That is, in order to further increase the brightness, the inventors of the tree
In the surface light source panel of the invention, an end reflecting portion is arranged by applying a silver, white, etc. tape with high reflectivity to the non-light source side end surface of the surface light source for the − side light source. is on the non-light source side, and near this end reflection part,
It has been discovered that, contrary to expectations, there are cases in which the light shines brightly.

The present invention relates to an improvement in such a case, and in particular, in a surface light source panel that is used by arranging a primary light source on the negative end surface side and an end reflecting section on the other end surface side, one side can obtain brighter and more uniform luminance. An object of the present invention is to provide a surface light source panel for a light source.

[Means for solving the problem] After extensive research in line with the above purpose, we found that the incident light from the -order light source reaches the edge reflection section, is reflected by this, and enters the surface light source panel again, thereby eliminating this non-light drifting. The secondary light source is placed too close to the side edge, and as a solution to this problem, it is effective to control the diffused reflection area by placing it near the edge reflection area, which corresponds to the worn out secondary light source. The present invention has been made based on the discovery that It is characterized by arranging the maximum area ratio portion of the diffused reflection layer at a position offset to the side, and symmetrically and steplessly decreasing the area ratio of the diffused reflection layer in both directions from the offset position. This is the main point of this article, which concerns the one-side light source panel.

[For production] In the present invention, the incident light from the -order light source is:

Initially, the diffused reflection part whose area ratio increases steplessly moves through the panel, brightening the panel surface, while
On the side of the end reflection section from the maximum area ratio part, the diffused reflection section that decreases steplessly reversely adjusts the composite light amount of the incident light that progresses while being consumed and the light reflected by the end reflection section, and reduces this as described above. Similarly, it makes the light shine brightly and ensures its uniformity.

In addition, at this time, even if the maximum area ratio part is shifted toward the end reflection part, it does not reach the end part, so the relative distance between the primary light source and this maximum area ratio part is shortened, and it can be used as a single-sided light source panel. Since the maximum light amount position is closer to the primary light source side, the overall brightness increases accordingly.

[Example] The present invention will be further explained below with reference to drawings showing examples. l is 1, for example, 0A41I! This is a portable type word processor shown as an example among electronic devices having a liquid crystal display screen such as a computer, a television receiver, etc., and this word processor 1 includes a main body 2 having a keyboard part 3, and a main body 2 having a face-to-face structure with respect to the keyboard part 3. It is composed of a main body 2 which is housed in a shape, and a tilting display section 5 which is connected and connected so as to be tiltable.

The tiltable display section 5 has a wide flat plate shape with a thinner wall of about 10 mm compared to the conventional front and rear thickness of about 3 cra, and a liquid crystal display screen 7 is installed with an opening in a horizontally long rectangular shape on the front side. It is.

That is, in the box 6 of this tiltable display section 5, from the front side, there are a transparent protection panel 8 made of transparent glass, resin, etc., a liquid crystal display panel 9 with an appropriate display color such as white or blue, and a milky white polyester film 10. A surface light source panel 11 and a white polyester film 12 are stacked in close or close proximity in this order, and a two-surface light source panel 11 is provided.
A primary light source 13, which is a 2 to 4 W cold-eating polar fluorescent lamp, is installed and built into the lower end of the surface light source panel 11 along its longitudinal direction, facing and close to one end surface 16 of the surface light source panel 11. .

In addition, the fluorescent lamp used for this -order light source 13 is made transparent in the longitudinal direction, especially in the part of the glass tube facing the surface light source panel 11, and uses an aperture T in which the remaining part is internally reflected. The amount of incident light from the primary light source is relatively increased by the facing portion of the primary light source.

Furthermore, in this example, a transparent adhesive is used on the other three end faces of the surface light source panel 11, including the other end face 17 located opposite to the side of the -order light source 13 and corresponding to the upper end. By integrally adhering a white resin tape to a series of end faces, loss due to transmission of incident light from the primary light source 13 is prevented as much as possible. End reflection part 1 on the end face 17 side
4.

By the way, the surface light source panel 11 used in this way is
In this example, a single acrylic transparent resin flat plate 15 having vertical and horizontal dimensions of 130 x 240 mm and a thick wall of 6 ynm is used. In this example, a diffused reflection layer 18 is formed over the entire area.

The diffuse reflection layer 1B has a diffuse reflection section "
19..., the diameter of this diffused reflection section 19,
By changing the distribution density, the transparent resin flat plate 1
In this case, the area ratio to 5 is successively and steplessly changed from the one end surface 16 side of the primary light source 13.

In this stepless change, this - side end surface 1
In this example, the maximum area ratio portion 20 is arranged at a position shifted toward the end reflecting portion 17 from the center position between the primary light source 13 of 6 and the end reflecting portion 14 of the other end surface 17. This offset position is set within a range of 90±10 mm from the - side end surface 16, which is located after the vertical dimension of 130 mm.

The diffused reflection j1918 further decreases its area ratio symmetrically and steplessly in the direction of the -order light source 13 and the end reflection section 14 by 2 degrees with the shifted maximum area ratio portion 20 as the center line. It is assumed that the

In one example, this diffuse reflection layer 18 that changes symmetrically and steplessly is formed by screen printing using a halftone dot pattern.

The halftone pattern is 1, for example 4 manufactured by Letra Japan Co., Ltd.
Based on the halftone screen pattern with a 2.5-line 1 area ratio change of 20 to 60%, this becomes about 20% at the maximum area of 60%, the primary light source 13 side, and about 40% at the end reflection part 14@ This is used as a modified knitted material, which is then positioned in alignment with the transparent resin flat plate 15, and screen printed.

Regarding screen printing, the above patent application 1986-2086
It is made using a light density white ink containing glass beads as shown in No. 70.

When installing the surface light source panel 11 configured in this way, a milky white polynisdel film lO is placed on the front as described above.
This is provided to prevent even the slightest halftone pattern of the diffused reflection layer 18 from appearing on the liquid crystal display surface 7 of the word processor 1, and to further promote diffused reflection. be.

Note that 4 in the figure indicates a handle.

According to this example, the liquid crystal display screen of the word processor 1 is as follows.
It is extremely bright and uniformly illuminated, and at the same time, for example, a plurality of fluorescent lamps are installed vertically on the blue surface of the liquid crystal display panel 8, as in the conventional case.
The debt issue display section 5 is made thinner than that of a horizontally installed one, and can be made about 10 riiny as described above.

FIG. 4 shows a case where a surface light source panel 11 configured in the same manner at the m position is applied to a stand type display device 121 for use on both sides of the one side light aperture 13 of approximately A4 size. , Similarly, two surface light source panels 11 with a thickness of 6 mm
．． 11 is arranged with a milky white polyester film lO sandwiched between them, and the same milky white polyester films 10 and 10 are placed and laminated on the front side of each film just in case, and are attached to a restraining frame 24 which can be attached and detached with a rubber magnet. Therefore, A4 size positive films (not shown) are arranged and fixed and used as an illuminated signboard on a counter or the like.

In FIG. 4, 22 is a display case, 23 is
- It is a stand with a built-in secondary light l113.

The instant example is as described above, but in carrying out the present invention, the following may be used.

In other words, in each of the above-mentioned surface light source panels, good results have been obtained by setting the deviation position of the maximum area ratio portion of the diffuse reflection layer to a position approximately % above from the center in the traveling direction of the primary light source light. The position may change relative to each other depending on the amount of light of the primary light source used, the size of the surface light source panel, the presence or absence of a gap between the end reflection part and the other end surface, the presence or absence of a curved surface, etc., so it should always be included in the above range. Under each specific condition, it is better to define this on the premise that it will deviate from the center position of both sides to the other side end face side. It is desirable to have it within the range of .

The primary light source may be appropriately selected from various sources, but when a cold cathode fluorescent lamp is used, it is desirable to use the aperture tube described above, as this is suitable for efficiently obtaining good brightness.

In addition to using the above-mentioned tape when configuring the edge reflector, paint may be applied directly to the edge, independent reflectors may be closely placed using strips of aluminum foil, or aluminum may be applied to the surface that faces the surface light source panel holding case. It is possible to attach foil etc.

The area ratio of the diffused reflection layer only needs to ensure sufficient uniformity by visual inspection, and is not necessarily required to have strict microscopic symmetry, and the minimum area ratio should be about 20%. is good, and 20% or more4 on the edge reflective part side.
In order to obtain suitable results, it is preferable to adjust the amount to about 0% or less.

In addition, the diffuse reflection layer of the present invention may be arranged in the form of fine lines such as a hairline shape or a haircloth shape, for example, by means other than printing, and when a screen pattern is used, the density may be 30 lines or more and 65 lines or less. Regarding the specific structure of the surface light source panel, including,
This can be done with reference to No. 8670, and it is also possible to use a curved shape instead of the flat shape described above. In addition, the surface light source panel of the present invention can be used for various fences and indoor and outdoor installations, either by incorporating it into other things or as a stand-alone lighting device or as a twin panel, so it is possible to install the -dimensional light sources facing each other. There is no need to install a transformer or the like on the other side, and therefore, as a whole,
An extremely thin lighting device can be obtained, and when it is incorporated into the electronic device, the entire device can be made thinner or smaller.

[Effect of the invention] The present invention has the following effects.

In other words, the surface light source panel of the present invention has a primary light source on one end surface and an end reflection section on the other am surface, and is intended for use as a ρ body-side light source. There is no need to install a light source, and there is no need to install a transformer, etc., on the other side. By processing this, the lighting device can be made extremely thin as a whole, and when installed with JIIl, its am
This is effective for compacting i, etc.

Moreover, in the surface light source panel of the present invention, the maximum area ratio portion of the diffused reflection layer is arranged at a position offset l from the center position toward the end reflecting portion, and the area ratio of the diffused reflection layer is symmetrical in both directions from the offset position. By arranging the shapes in a stepless manner so that they are arranged in a stepless manner, an extremely bright and uniform luminance can be obtained. This will greatly promote practical application.

[Brief explanation of drawings]

The drawings show an embodiment, and FIG. 1 is a perspective view of a word processor incorporating a surface light source panel for a tree-side light source, and FIG.
The figure is an exploded perspective view showing the main parts, FIG. 3 is a partially enlarged view of a diffuse reflection layer, and FIG. 4 is a perspective view of a display device using the above surface light source panel. l... Word processor lO... Milky white film 7... Liquid crystal display surface 11... Surface light source panel 8...
- Transparent protection panel 13...-Next light source 9...Liquid crystal display panel 14... End reflective part l5...
Transparent resin flat plate 20...Maximum area ratio portion 18...Diffuse reflection layer 21...Display device 9...
Agent for patent applicant Meitaku System Co., Ltd.

Claims (1)

[Claims] The maximum area ratio portion of the diffused reflection layer is arranged at a position offset toward the end reflection part from the center position between the primary light source on one end face side and the end reflection part on the other end face side, and diffused reflection is reflected in both directions from the offset position. 1. A surface light source panel for a one-sided light source, characterized in that the area ratio of the layers is arranged symmetrically and in a stepless manner.