JPH10115714A - Light emitting panel for surface light source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source for various displays, in particular, a light source for a surface light source, which is suitable for being installed as a light source panel for a rear light source on the back surface of a liquid crystal display cell, and has significantly improved light emitting efficiency and a viewing angle of a liquid crystal display. panel. SOLUTION: In a surface light source panel including a light reflecting layer, a light emitting surface provided to face the light reflecting layer, and a light guiding surface, the light emitting surface has a number of convex shapes,
A light emitting panel for a surface light source, wherein a light diffusion layer is provided on each of the convex shapes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-emitting panel for a surface light source, and more particularly, to a light-emitting panel for a display, particularly to a light-emitting panel for a rear light source on the back of a liquid crystal display cell. The present invention relates to a light emitting panel for a surface light source in which a viewing angle of a display is significantly improved.

[0002]

2. Description of the Related Art In recent years, with the rapid development of the information society, terminal devices for transferring various information to humans have been used very frequently. Most of these terminal displays are so-called CRTs. These CRTs are excellent in color display function and image adjustment function, and have many advantages such as a small number of signal cables. Since a display tube made of glass is required, it is large, heavy, and has the drawback of taking up space. Therefore, various flat-type flat displays have been proposed mainly for applications such as wall-mounted, portable, and portable types. Among them, a liquid crystal display which is particularly promising is a liquid crystal display which can be driven by an IC and can be easily made into a color.

[0003]

The conventional liquid crystal display has a light reflection layer on the back surface and displays information by using external light from the front surface, and does not require a special light source. It is widely used as a display for computers, battery-powered computers, clocks, and the like. However, when such a liquid crystal display is used in place of a conventional CRT as a terminal or a television, the viewing angle, contrast and display quality are inferior due to lack of brightness, and especially 10 to 12 inches. Make it over size
For large-capacity display of about 20 to 25 lines of 80 characters, there is a problem in display quality.

Further, since there is no special light source, the display quality is affected by changes in external light environment conditions, and there is a disadvantage that the display function is completely lost in the absence of external light. In order to solve such a problem, recently, many studies have been made on a back light source installed on the back surface of a liquid crystal display. As these back light sources, organic dispersion type E
L, a thin film EL, a light emitting diode array,
Various types have been proposed, such as a combination of a light source such as a fluorescent lamp or a lamp and a light guide plate, a Fresnel type light guide plate, an illumination box, etc., but for a large display, uniformity, light efficiency, color rendering, etc. There is no known satisfactory one.

Among these, a promising one is to provide a light source such as a fluorescent lamp on the side of a translucent panel such as an acrylic plate,
A method of emitting light from one surface of a panel is known. Although this method is promising, it does not solve the problem of the narrow viewing angle inherent in liquid crystal displays. As a method for solving this problem, there are known a method of roughening a light emitting surface of a light emitting panel and a method of diffusing emitted light by using a light diffusing agent such as alumina or glass beads. However, this method has insufficient light diffusivity,
In addition, since the light diffusing agent also has a certain level of light absorbency, the light diffusing effect is reduced as the size of the display is increased. Rather, there is a problem that the brightness is insufficient at the center of the display.

In addition, as the size of a large display increases, the number of people observing the display increases, and as a result, more excellent light diffusivity, particularly light diffusivity to the left and right of the screen, is required. Almost no response has been made to the demand for light diffusion.

Further, in this method, since a fluorescent lamp is used as a light source, there is a problem of the thickness of the light emitting panel. In other words, it is the thinnest state that the fluorescent lamp is installed on the side of the panel. However, if the panel is thinner than the diameter of the fluorescent lamp, there is a problem that the light guiding efficiency is remarkably reduced. There is a problem that the light output efficiency from the light output surface is low because the light is straight traveling light parallel to the surface. Furthermore, there is a problem that the larger the panel is, the more the illuminance between the light source and the center of the panel becomes.

When a fluorescent lamp is used as a light source, the amount of light from the light emitting surface cannot be arbitrarily controlled because the amount of light from the fluorescent lamp is always uniform. And cannot cope with the use environment.
Further, in consideration of not only the light amount, that is, light and dark, but also the white balance and the color rendering, and further considering the eye strain of the user, it is desirable to adjust the wavelength from the light emitting surface to obtain an appropriate hue light. In the case of a fluorescent lamp, since only white light is emitted, there is a disadvantage that it is impossible to electrically adjust the white light.

Therefore, a main object of the present invention is to enlarge a viewing angle, which is an essential drawback of a liquid crystal display, particularly a left and right viewing angle for a viewer, which is large enough to replace a CRT. Further, it is an object of the present invention to provide a light emitting panel for a surface light source, which can make the light emitting panel thin regardless of the size of a light source such as a fluorescent lamp, and which has excellent light emitting efficiency. Another object of the present invention is to provide a surface light source that is large enough to replace a CRT and that can easily adjust the light amount and / or wavelength according to the light environment to be used and individual differences among users. It is to provide a light emitting panel. The object of the present invention has been achieved by the following present invention.

[0010]

That is, the present invention relates to a surface light source panel comprising a light reflecting layer, a light emitting surface provided opposite to the light reflecting layer, and a light guiding surface. A light emitting panel for a surface light source, characterized in that the surface has a large number of convex shapes and each of the convex shapes is provided with a light diffusion layer.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in more detail with reference to the accompanying drawings, which schematically show preferred embodiments of a light emitting panel for a surface light source according to the present invention. It is to be noted that, in order to facilitate the explanation, each of the drawings is not a uniform scale drawing of an original size, but is drawn with its length direction being compressed. FIG. 1 is a cross-sectional view of one example of a light emitting panel for a surface light source according to the present invention, FIGS. 2 to 3 are cross-sectional views of another example of a light emitting panel for a surface light source of the present invention, and FIG. 2 is a plan view of a light emitting panel for surface light source 2;
FIG. 5 is a sectional view of a conventional light emitting panel for a surface light source.

As shown in FIG. 5, a conventional light emitting panel for a surface light source using an acrylic plate or the like has a light guide panel B provided with a light reflecting layer 4 at a portion other than a light emitting surface 3 and a light guiding surface 1. A light source A such as a fluorescent lamp is attached to the portion (light guide surface 1). One component of the light from the light source A emits light (arrow) almost perpendicularly from the light emission surface 3, and is provided thereon. The viewing angle of the liquid crystal display 5 is not improved. If the light emitting surface 3 is made to be light diffusing by a light diffusing agent in order to improve the viewing angle, the brightness of the light emitting surface increases as the light diffusing property increases. Was reduced.

Further, due to the problem of the thickness of the light emitting panel, if the thickness of the light emitting panel B is smaller than the diameter of the fluorescent lamp A, there is a disadvantage that the efficiency of introducing the light source light 6 is reduced. Further, if the light output panel B is made thicker, the light guide efficiency is improved, but this does not conform to the current tendency to reduce the thickness and weight. In addition, since the light introduced from the light source A occupies a large proportion of light traveling straight in the light emitting panel B in parallel to the light emitting surface,
There is a problem that the light emitting efficiency from the light emitting surface 3 is low. Further, the illuminance of the light emitting surface 3 near the light source A is high, and the illuminance decreases as the distance from the light source A is increased.

When a fluorescent lamp is used as the light source A, the light amount of the light emitting surface 3 cannot be arbitrarily controlled because the light amount of the fluorescent lamp is always uniform. Inability to respond to individual differences and usage environment. In addition, not only light quantity, that is, light and dark, but also considering white balance and color rendering properties, and furthermore, user's eye strain,
It is also desirable to adjust the wavelength from the light emitting surface 3 to obtain an appropriate hue light. However, when the light source A is a fluorescent lamp, only white light is emitted, so that the wavelength of the light is electrically adjusted. There is a problem that is impossible.

The light emitting panel for a surface light source according to the present invention solves the problems of the prior art as described above, and is shown in FIGS.
As shown in FIG. 1, the light emitting surface 3 is not a planar shape but a convex shape (preferably a convex curved shape) 11 such as a large number of lenticulars or a fly's eye.
The viewing angle of the liquid crystal display 5 arranged above, in particular, the viewing angle to the left and right can be enlarged.

Such a number of convex shapes 11 such as a lenticular shape or a fly's eye shape may be arranged in the light emitting surface 3 in any direction, that is, vertically, horizontally, or randomly. Further, the pitch width of the convex shapes 11 such as the large number of lenticulars and the shape of a fly is not particularly limited. However, if the pitch width is too large, the flatness of the light emitting surface 3 is lost and integration with the display 5 is performed. In addition, the uniformity of the emitted light becomes insufficient.

On the other hand, if the pitch width is too small, the light exit surface 3
Is sufficiently flat, but the diffusion efficiency, especially the diffusion efficiency to the left and right, becomes insufficient, which is not preferable. According to the inventor's detailed research, depending on the size of the light emitting panel B,
Generally 0.01 to 10 mm, preferably 0.05 to
When the pitch is 1.5 mm, the flatness of the light emitting surface and the light diffusing property of the light emitting surface, especially the light diffusing property to the left and right, are the best. It has been found that the display function of the display is best exhibited by making the pitch width substantially the same as the pitch width.

Further, in a preferred embodiment shown in FIG. 2, the light guide panel 7 is integrally formed at the end of the light output panel B, and the light guide section 7 is arranged, for example, shifted upward from the horizontal plane of the light output panel B. Accordingly, the entire thickness including the liquid crystal display 5 can be reduced.
The light 6 from the light source A is not parallel to the light-emitting surface 3 but light at an angle directed to the light-emitting surface 3 by forming the reflecting surface 8 below the light-emitting surface 3 into an appropriate shape or giving an appropriate angle. The light can be sent to the light exit surface 3 via the light guide 2, and the viewing angle of the liquid crystal display 5 can be further increased.

With the above configuration, the light (arrow) emitted from the light emitting surface 3 can be emitted even when the thickness of the light guide portion 2 of the light emitting panel B is smaller than the diameter of the fluorescent lamp A as a light source. The introduced light is reflected on the reflecting surface 4 on the side facing the light emitting surface 3.
And 8 are reflected (primary reflected light) and directly reach the light emitting surface 3 to enlarge the viewing angle of the liquid crystal display 5 and
The light guide efficiency of the light source light 6 is not reduced.

Further, the example shown in FIG. 3 is an example in which the light-emitting surface 3 having a large number of convex shapes 11 such as a lenticular shape or a fly's eye shape on the light-emitting surface 3 is entirely convex. In addition to having the effect of the example shown in FIG. 2, the viewing angle of the display 5 can be further increased. Further, in the example shown in FIG. 3, the overall convex curved surface shape is only one, but this is divided into a plurality of portions such as two or three, and a large number of lenticulars and A convex shape 11 such as a fly's eye shape may be formed.

With this configuration, even if the curvature of the entire convex curved surface shape is large, it is not necessary to increase the thickness of the light emitting panel B accordingly. Therefore, the thickness of the panel B is increased accordingly. Since there is no need, there is no problem that the light emitting surface of panel B is made thicker by making it a curved surface.

In yet another preferred embodiment of the present invention,
As shown in FIG. 1, a light control filter 9 is provided around the light source A. The dimming filter 9 can freely change the intensity and hue of the light from the light source A, and has a function as a light amount filter and / or a wavelength filter. First, when the dimming filter 9 is a light amount filter, such a light amount filter may have any configuration as long as the amount of light emitted from the fluorescent lamp A can be adjusted, and some preferable ones. An example is as follows.

(1) A mode in which a layer capable of controlling the light of the fluorescent lamp is formed around the fluorescent lamp A so that the fluorescent lamp can be rotated. In this embodiment, the layer serves as a light amount filter, for example, a method of forming a layer capable of blocking light or absorbing light, such as black and other colors, and a method of forming a layer capable of reflecting light such as white and metallic colors And so on. Such a light amount control layer is prepared by preparing an appropriate ink or paint and printing it around the fluorescent lamp A, or by brush, roll, spray, electrostatic coating, or the like.
Baking, applying by a method such as an ink jet method, or a method such as vapor deposition, CVD, sputtering, or forming a dyeing layer in advance and then directly forming the light source by a method of dyeing,
It may be formed in advance on another transparent base material and then bonded by any method such as bonding.

Of course, such a light amount filter is not formed uniformly on the tube wall of the fluorescent lamp A, but is formed with an appropriate density difference or density difference in a linear, striped, or dot shape.
Alternatively, light-shielding material layers having different transmission densities are formed stepwise or continuously. By forming the light amount filter 9 having such a configuration and rotating the fluorescent lamp A by an appropriate means (not shown), the light amount reaching the light emitting surface can be easily controlled.

(2) An embodiment in which the fluorescent lamp A is fixed and a rotatable light amount filter 9 is provided around the fluorescent lamp A. The principle of this example is exactly the same as in the case of the above (1). For example, a tubular filter 9 made of transparent glass or plastic is formed, and the surface thereof has a density difference or a density difference as in the above (1). A method of forming a light absorbing layer or a light reflecting layer may be used. Further, after the above-mentioned tubular body is provided, a film or the like having the above-mentioned light amount adjusting function may be wound around the surface thereof.

Also, a flexible tubular sheet is used to
It is also possible to rotate the shaft and feed it. By providing the light amount filter 9 having such a configuration and rotating the filter 9 by a suitable means (not shown) such as a gear or a belt, the light amount reaching the light emitting surface can be arbitrarily controlled. In the above, the tubular filter has been described as an example for ease of explanation, but the filter is not limited to these examples, and may have any shape and drive mechanism.

In the case where the light control filter 9 is a wavelength filter, the light absorbing layer according to the above-described embodiments (1) and (2) is colored to absorb light of a specific wavelength. The goal can be achieved. That is, the light control filter 9 may be colored in any order with yellow, orange, red, blue, green, violet, or an intermediate color thereof.
By rotating or sliding according to the user's preference, the wavelength of light reaching the light exit surface from the light source can be arbitrarily controlled. Further, for example, in a television application, it is effective as a method that can easily perform the essential hue adjustment.

Further, the light control filter 9 used in the present invention
Can simultaneously serve as the light amount filter and the wavelength filter. For example, a method of providing both functions of light quantity control and wavelength control on the same filter,
In the configuration example, there is a method of dividing into a plurality of filters and superimposing them on each other, and controlling them independently.The latter can perform more adjustments such as light intensity, color tone, shade of color tone, etc. Suitable for adjustment.

The light emitting panel B having the above-described effects of the present invention can be made of any material having excellent translucency, for example,
Although it can be formed from a glass material, etc., from the viewpoint of ease of molding and light transmission, acrylic resin, acrylonitrile-styrene copolymer resin, cellulose acetobutyrate resin, cellulose propionate resin, polymethylpentene resin,
It is preferably formed of a translucent plastic material such as a polycarbonate resin, a polystyrene resin, and a polyester resin, or a composite or copolymer thereof.
In addition, a reaction-solidified epoxy resin, acrylic resin, methacrylic resin, urethane resin, or the like can be used.
Molding methods include injection molding, compression molding,
Any of the known methods such as casting, cutting, and polishing can be applied.

The light-reflecting layers 4 and 8 of the light-emitting panel B obtained as described above have the light-emitting surface 3 as shown in FIGS.
A light-reflective metal such as nickel, aluminum, silver, or gold is formed on other portions of the light guide portion 7 except for the light guide surface 1 by vapor deposition, sputtering, plating, silver mirror reaction, or a reflective metal-containing paint. Or by bonding a light-reflective material such as an aluminum sheet to prevent the light source light 6 from leaking out of the panel B. Some of the leaked light is reflected inside again. It is effective including the effect of doing. It is also effective as a means to form a layer with a light-shielding agent or a light-absorbing agent for preventing unnecessary light from entering outside light, which is not designed. These reflecting surfaces can be treated to be scattered or use a retroreflective material such as glass beads as long as the optical design is not disturbed. It is possible.

A light diffusing layer 10 is formed on the light exit surface 3 to increase the viewing angle due to a large number of lenticulars and convex shapes such as a fly's eye shape of the light exit surface 3, and further increase the liquid crystal. The viewing angle of the display 5 can be increased.
Such a light-diffusing layer is not preferable if the light-diffusing property is too large, because the illuminance on the light-emitting surface is reduced. The light-diffusing layer 10 may have a light-emitting surface roughened by sandpaper polishing, sandplast, horning, buffing, hairline processing, embossing, pressing, or the like at the time of or after the formation of the light-emitting panel, or silica, Dipping, roll coating, blade coating, spray coating, etc., with a transparent resin layer containing a white pigment such as alumina, titanium oxide, zinc oxide, barium sulfate, magnesium oxide or a light diffusing material such as glass beads having a specific diameter. Formed by the method,
Alternatively, by bonding these layers, the light reaching the light emitting surface 3 is diffusely reflected or diffused, so that the illuminance from the light emitting surface 3 is made uniform and the viewing angle can be widened.

Further, such a light diffusing layer is prepared by separately preparing a ground glass plate, a light diffusing glass plate, a light diffusing plastic sheet, etc., and simultaneously integrating them during molding, or combining the liquid crystal display 5 with the light emitting surface during use. 3 and may be placed or bonded together. It is also advantageous in terms of efficiency improvement and thermal design to arrange a light-reflecting condenser mirror or heat sink on the side of the light source opposite to the light guide.

In the light emitting panel B of the preferred embodiment of the present invention as described above, the light emitting surface 3 and the light guide 7 form a concave portion as shown in FIGS. 2 and 3, and the liquid crystal display 5 is mounted in this concave portion. By doing so, the back surface of the liquid crystal display 5 can be illuminated, and the liquid crystal display 5 can be clearly seen regardless of the environment. Further, by forming the light emitting panel of the present invention in such a shape, the thickness of the entire display including the back light source can be reduced, and the overall weight can be reduced.

Although the present invention has been described with reference to preferred embodiments of the present invention, the surface light source of the present invention is applicable as long as the light-emitting surface has a convex shape such as a large number of lenticulars or fly's eyes. The light emitting panel for use is not limited to the illustrated shape, and may have any shape. For example, the shape of the various lens surfaces may be a hemispherical surface, an elliptical surface shape, a shape in which the top of a somewhat protruding rectangular body is a hemispherical shape, and the like, and further, the light guide portion 7 (light source A) of the light emitting panel B. Is not limited to the location shown in the figure.
There may be three places, three places or four places, and the shape of the light emitting panel B is not limited to a rectangle, and may be any shape such as a disk shape, an elliptical plate shape, a polygonal shape, and a rectangular shape having a rounded corner. Accordingly, the shape of the light source is not limited to the rod-shaped fluorescent lamp A, but may be an arbitrary shape such as an annular shape depending on the shape of the light emitting panel B.

In the light emitting panel for a surface light source of the present invention as described above, the light emitting surface has a convex shape such as a large number of lenticulars or the shape of a fly's eye. Since the shape is not vertical but is diffused outward, the viewing angle of the liquid crystal display mounted on the light emitting surface can be increased. That is,
In the case of the light emitting panel for a surface light source of the present invention, the diffusion angle of light, particularly the diffusion angle to the left and right, is very wide. If the illuminance at the center is 1, the angle at which the illuminance is attenuated by 10% is ± 70 from the center. ° to ± 80 °.

Further, from such a wide viewing angle, the illuminance of the light emitting surface was also very uniform, and the illuminance unevenness in the length direction of the fluorescent lamp as the light source was very small. Further, since sufficient light diffusion is possible by the above configuration, the amount of light diffusing agent used for forming the light diffusing layer on the light exit surface or the degree of light diffusing treatment can be reduced, and light attenuation is reduced,
High light output efficiency can be obtained. That is, the illuminance of the light emitting surface in the case of the conventionally known light emitting panel for a surface light source as shown in FIG. 5 is only about 10% of the fluorescent light source, but the illuminance in the case of the light emitting panel for a surface light source of the present invention is Light source 30 ~
Reached 70%.

Further, in a preferred embodiment of the present invention, in addition to the effect of increasing the viewing angle by the convex shape such as the lenticular shape or the fly's eye shape, the light from the light source is incident parallel to the light guide. Instead, the light is incident as reflected light having directivity on the light exit surface, so that most of the incident light can be light with an angle directed to the light exit surface, and the light from the light source Can be efficiently guided to the light emitting surface, and the viewing angle of the liquid crystal display can be further expanded.

In another preferred embodiment of the present invention,
Regardless of the size of the fluorescent lamp as a light source, the light guide portion can be made thinner, so that the demand for a thinner and lighter display can be satisfied and the viewing angle of the liquid crystal display can be further expanded. be able to.

For the same reason, the light guide is made thicker than the diameter of the fluorescent lamp, and more than half of the fluorescent lamp is fitted into the light guide. Since the portion can be made thinner than the diameter of the fluorescent lamp, most of the light emitted from the fluorescent lamp can be collected and introduced into the light guide. Therefore, even if the light guide portion is thinner than the diameter of the fluorescent lamp, the light source light use efficiency can be significantly improved.

Further, a light reflecting layer is formed on the outer surface of the light emitting panel except for a part of the light emitting surface and the like, and the angle and shape of the light reflecting panel with respect to the light source are appropriately controlled so that the light from the light source can be uniformly distributed over the entire light emitting surface. Therefore, the illuminance on the light emitting surface can be made more uniform, and the viewing angle of the liquid crystal display can be further expanded.

Further, in a preferred embodiment of the present invention, by providing a dimming filter around the light source, the light quantity and / or wavelength of the light reaching the light emitting surface can be easily and arbitrarily controlled by the user. A display such as a liquid crystal display can be used with an optimum amount of light (bright and dark) and / or an optimum wavelength of light (hue) for each user.

[0042]

【Example】

Example 1 Using a polymethyl methacrylate resin (Parapet HR, manufactured by Kyowa Gas Chemical Co., Ltd.), a shape as shown in FIGS. 2 and 4, a size of 200 mm × 120 mm, and a thickness of a light guide portion of 1
0 mm, lenticulars shape pitch width 1.2 mm,
A light-emitting panel having a light-guiding part having a thickness of 25 mm was formed by an injection molding method, and aluminum was vacuum-deposited on the outer surface excluding the light-emitting surface and the light-guiding surface to form a light reflecting layer. The light emitting surface was slightly roughened by a sand blast method to obtain a light emitting panel for a surface light source of the present invention. Two 15 W fluorescent lamps were used as light sources, fitted into recesses formed in the light guide, and the upper surface was sealed with an aluminum sheet to form a surface light source. When a liquid crystal display was mounted on the light-emitting surface of this surface light source and the surface light source was turned on, the liquid crystal display exhibited excellent viewing angles, contrast, and illuminance, and exhibited a high display function that was uniform throughout.

Example 2 A tubular body was formed from the acrylic resin of Example 1 above, with one end provided with a rotatable bar. Black dots were printed on the surface, and the number of dots changed continuously. Then, two dimming filters were prepared. The 15 W fluorescent lamps are mounted therein, the light guides of the light output panel of Example 1 are mounted, respectively, fitted into the recesses of the light guide of the light output panel of Example 1, and the upper surface is sealed with an aluminum sheet. The light control filter was turned off from the outside, and the light control filter was freely rotatable from outside to obtain a surface light source.

When a liquid crystal display was mounted on the light-emitting surface of the surface light source and the surface light source was turned on, the liquid crystal display was of a light-emitting type, had a good viewing angle and contrast, and exhibited a uniform high display function as a whole. Further, by gradually rotating the dimming filter, the brightness of the liquid crystal display changes, and dimming of the display surface can be performed according to individual differences and external light.

Example 3 In place of the dot printing sheet in Example 2, a sheet having a width equal to the circumference of the fluorescent lamp and having seven colors of rainbows, which are continuously transparent in the vertical direction, was used. In the same manner as in Example 2, a surface light source was obtained. When this surface light source was used in the same manner as in Example 1, the hue of light on the display surface could be changed to various hues.

[0046]

As described above, the light emitting panel for a surface light source of the present invention is very useful as a light emitting panel for a back light source of various displays such as a liquid crystal display.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a cross section of an example of a light emitting panel for a surface light source according to the present invention.

FIG. 2 is a diagram schematically showing a cross section of one example of a light emitting panel for a surface light source according to the present invention.

FIG. 2 is a diagram schematically showing a cross section of one example of a light emitting panel for a surface light source according to the present invention.

FIG. 4 is equivalent to the plan view of FIG.

FIG. 5 is a diagram schematically showing a cross section of a light emitting panel for a surface light source according to the related art.

[Explanation of symbols]

 A; light source B; light emitting panel 1; light guiding surface 2; light guiding portion 3; light emitting surface 4; light reflecting layer 5; display 6; light source light 7; light guiding portion 8; Light diffusion layer 11; Lenticular shape

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 25, 1997

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a cross section of an example of a light emitting panel for a surface light source according to the present invention.

FIG. 2 is a diagram schematically showing a cross section of one example of a light emitting panel for a surface light source according to the present invention.

FIG. 3 is a diagram schematically showing a cross section of one example of a light emitting panel for a surface light source according to the present invention.

FIG. 4 is equivalent to the plan view of FIG.

FIG. 5 is a diagram schematically showing a cross section of a light emitting panel for a surface light source according to the related art.

[Explanation of Symbols] A; light source B; light emitting panel 1; light guiding surface 2; light guiding portion 3; light emitting surface 4; light reflecting layer 5; display 6; Light control filter 10; Light diffusion layer 11; Lenticular shape

Claims (4)

[Claims] 1. A surface light source panel comprising a light reflecting layer, a light emitting surface provided to face the light reflecting layer, and a light guiding surface, wherein the light emitting surface has a number of convex shapes,
A light emitting panel for a surface light source, wherein a light diffusion layer is provided on each of the convex shapes. 2. The light emitting panel for a surface light source according to claim 1, wherein the plurality of convex shapes are lenticulars shapes or fly-eye-shaped convex curved shapes. 3. The light emitting panel for a surface light source according to claim 1, wherein the diffusion layer has a rough surface. 4. The light emitting panel for a surface light source according to claim 1, wherein the diffusion layer is formed of a transparent resin containing a light diffusing material.