JPH1091073A - Display panel and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recognize an LED on a back surface with high luminance or to surely perform remote control with an infrared ray remote control device by providing a cylindrical or a pyramid-state projection on the transmission part of the back surface of a panel base. SOLUTION: The panel base 2 is molded so that the LED 6 or a photodetector for remote control is arranged on the transmission part 4, that is, the back surface, and a part transmitting visible light or an infrared ray has the cylindrical or the pyramid-state projection 5. The forming range of the projection 5 may be the same size as that of the part 4, may be larger or smaller than that of the part 4. Thus, since the part 4 for transmitting the visible light emitted from the LED 6 on the back surface of the panel base 2 has the cylindrical or pyramid-state projection 5, the visible light emitted from the LED 6 is guided to the surface of the panel base 2 while being reflected inside the projection 5. Consequently, extinction by diffusion is drastically restrained, so that the luminance of the LED 6 is viewed high in the case the visible light is viewed through a display panel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel using LEDs or remote control light-receiving elements for use in audio equipment, home appliances, automobiles and the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a display panel used for audio equipment, home electric appliances, automobiles, etc., in which an LED or a light receiving element for a remote control is arranged on a back surface, has a printed layer on the surface of a resin panel base. Some have a visible light transmitting portion from the LED or an infrared transmitting portion to the light receiving element for the remote controller on the rear surface, recognize the blinking of the LED from the front side, and perform remote control by the remote controller.

[0003] These conventional display panels have been produced by a method of printing directly on the surface of a resin panel base or a method of bonding a printed sheet to a resin plate.

Japanese Patent Application Laid-Open No. 63-19694 also discloses a method for producing a display panel having a transfer layer on the surface of a resin panel base by simultaneous transfer with molding.

[0005]

As audio equipment and the like have been miniaturized, the LEDs on the back of the display panel have also been miniaturized, resulting in LEDs with low power consumption. However, there is a problem in that the LED emits less light than a light bulb or the like, and when viewed through a display panel, the visible light from the LED is dimmed due to diffusion, and the expected emission luminance cannot be obtained.

Further, even when a remote control light-receiving element is provided on the back of the display panel, the infrared light to the remote control light-receiving element is attenuated by diffusion, so that the infrared light receiving sensitivity is reduced and remote control by the infrared remote control is performed. There was a problem that it was difficult.

Therefore, the present invention solves the above-mentioned problems, and provides a front panel capable of recognizing LEDs on the back with high brightness or capable of reliably performing remote control using an infrared remote controller, and a method of manufacturing the same. The purpose is to do.

[0008]

In order to achieve the above object, a display panel according to the present invention has a transfer layer on the surface of a resin-made panel base and is provided with a visible light from an LED on the back or a remote control for the back. In a display panel having an infrared transmitting portion to the light receiving element, the transmitting portion on the back surface of the panel base is configured to have a columnar or frustum-shaped projection.

Also, in a display panel having a decorative film on the surface of a resin-made panel base and transmitting a visible light from an LED on the back or an infrared ray to a light-receiving element for remote control on the back, a transmission on the back of the panel base is provided. The portion was configured to have a columnar or frustum-shaped projection.

In each of the above configurations, the visible light transmittance or the infrared light transmittance of the transmission portion of the display panel is 50% or more.

Further, according to the present invention, a transfer material having a transfer layer formed on a base sheet is superimposed on a surface of a resin panel base, and the transfer material is adhered to the panel base by applying heat and pressure. Transferring only the transfer layer to obtain a display panel having a transmission part of visible light from the LED on the rear side or an infrared ray to the light-receiving element for remote control on the rear side, the transmission part on the back of the panel base is columnar or It was configured to have a frustum-shaped projection.

Further, a transfer material having a transfer layer formed on a base sheet is sandwiched between molding dies, a molten resin is injected and filled in the dies, and cooled to obtain a panel base. A method for producing a display panel having a transmitting portion of visible light from an LED on the back or an infrared ray to a light-receiving element for remote control on the back by transferring only the transfer layer after peeling off the base sheet after bonding the transfer material. In this case, a column-shaped or frustum-shaped projection may be formed on the panel base by making the mold portion corresponding to the transmission part on the back surface of the panel base into a concave portion.

[0013] The present invention also relates to a method of superposing a decorative film on a surface of a resin-made panel base, and applying heat and pressure to adhere the decorative film to the panel base.
In a manufacturing method for obtaining a display panel having a transmitting portion of visible light from D or an infrared ray to a light-receiving element for remote control on the rear surface, the transmitting portion on the rear surface of the panel base is configured to have a columnar or frustum-shaped projection.

Further, by sandwiching the decorative film between the molding dies, injecting and filling a molten resin into the mold, and cooling to obtain the panel base, the decorative film is adhered to the surface of the panel base at the same time. In a manufacturing method for obtaining a display panel having a transmitting portion of visible light from an LED on the rear side or an infrared ray to a light-receiving element for remote control on the rear side, a mold portion corresponding to the transmitting portion on the rear side of the panel base is formed into a concave portion and a columnar shape is formed on the panel base. Alternatively, a frustum-shaped projection may be formed.

In each configuration of the above-described manufacturing method, the visible light transmittance or the infrared light transmittance of the transmission portion of the display panel is 50% or more.

[0016]

Embodiments of the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 are sectional views showing an embodiment of a display panel according to the present invention. FIGS. 3 to 8 are perspective views showing an embodiment of a projection of the display panel according to the present invention. FIG. 10 is a sectional view showing one embodiment of each step of the method for manufacturing a display panel of the present invention. In the figure, 1 is a display panel, 2 is a panel base, 3 is a transfer layer, 4 is a transmissive part, 5 is a protrusion, 6 is an LED, 7 is a light receiving element for remote control, 8 is a transfer material, 9 is a mold, and 10 is a mold. Each shows a decorative film.

According to the present invention, a resin panel base 2 has a transfer layer 3 or a decorative film 10 on the surface thereof,
In a display panel having a transmission part 4 for transmitting visible light from the infrared ray 6 to the light-receiving element 7 for remote control on the rear side, the transmission part 4 on the rear side of the panel base 2 has a columnar or frustum-shaped projection 5.
(See FIGS. 1 and 2).

The panel base 2 is formed in such a manner that an LED 6 or a light-receiving element 7 for a remote controller is disposed on the transmitting portion 4, that is, on the rear surface, and a portion that transmits visible light or infrared light has a columnar or frustum-shaped projection 5. The formation range of the projection 5 may be the same size as the transmission part 4, or may be wider or narrower than the transmission part 4. The LED 6 is a light emitting diode that emits light in red, yellow, green, blue, and the like. The projection 5 is provided on the panel base 2 to guide most of the visible light from the LED 6 to the surface of the panel base 2 while reflecting the light within the projection 5 or to reflect most of the infrared light from the remote controller in the projection 5. This is for guiding to the remote control light receiving element 7 on the back side of the panel base 2. The shape of the projection 5 is columnar or frustum-shaped, and specifically, a polygonal prism (see FIG. 3) such as a cylinder, a triangular prism, or a quadrangular prism, a polygonal truncated cone such as a truncated cone, a triangular pyramid, or a quadrangular pyramid. There is. The frustum of a cone is a cone delimited by two parallel planes that intersect at right angles to the axis, and the frustum of a polygon is the same (see FIG. 4). In addition, the columnar shape or the frustum shape includes a shape similar to the above-described column or frustum. For example, the bottom surface of the protrusion 5 may not be parallel to the top surface according to the shape of the panel base (see FIG. 5). In addition, the top surface of the protrusion 5 is rounded (see FIG. 6).
(See FIG. 7), or the top surface of the projection 5 may be angled with respect to the LED 6 and the remote control light-receiving element 7 (see FIG. 8). . The side surfaces of the projections 5 are formed in a mirror surface so as to promote internal reflection of the resin.

The panel base 2 is a resin molded product, and may be transparent or translucent. Opaque materials are not suitable because they do not transmit visible or infrared light. Further, the panel base 2 may be colored or not colored. As the resin, polystyrene resin,
General-purpose resins such as polyolefin resins, ABS resins, AS resins, and AN resins can be given. In addition, polyphenylene oxide polystyrene resin, polycarbonate resin, polyacetal resin, acrylic resin,
General-purpose engineering resin such as polycarbonate-modified polyphenylene ether resin, polybutylene terephthalate resin, ultra-high molecular weight polyethylene resin, polysulfone resin, polyphenylene sulfide resin, polyphenylene oxide resin, polyarylate resin, polyetherimide resin, polyimide resin, liquid crystal polyester resin A super-engineering resin such as a polyallyl heat-resistant resin can also be used.

The visible light transmittance or infrared light transmittance of the transmission section 4 of the display panel 1 is 50% or more. The reason for setting the visible light transmittance to 50% or more is to recognize the blinking of the LED 6 with high luminance.
This is because the ED6 has a large dimming and has no practical value. 5
The visible light transmittance of 0% or more can be realized by reducing the amount of the colorant in the design layer in the portion of the transfer layer 3 or the decorative film 10 covering the front surface of the LED 6. On the other hand, the reason why the infrared transmittance is set to 50% or more is to ensure the response of the remote controller even if the distance from the remote controller is long, and if the distance is less than 50%, the response of the remote controller is not reliable. The infrared transmittance of 50% or more, for example, a portion of the transfer layer 3 or the decorative film 10 that covers the front surface of the remote control light-receiving element 7 has an infrared transmittance of 70 to 80% and a visible light transmittance of 20% or less. By forming using dye ink, built-in components such as the light-receiving element 7 for remote control are not seen from the front side of the panel,
Can be realized. Here, assuming that each of the transmittances is the incident light amount T and the transmitted light amount T ₀ , the transmittance = (T ₀ / T) × 1
00 (%).

In order to obtain the display panel 1 by providing the transfer layer 3 on the surface of the resin panel base 2 as described above, a transfer layer 3 composed of a release layer, a pattern layer, an adhesive layer, etc. is formed on a base sheet.
Using the transfer material 8 formed with the above, the transfer material 8 is adhered to the panel base 2 by applying heat and pressure, and then the base sheet is peeled off to transfer only the transfer layer 3. Further, the transfer material 8 having the transfer layer 3 formed on the base sheet is sandwiched between the molding dies 9, the molten resin is injected and filled in the dies 9, and then cooled to obtain the panel base 2. After the transfer material 8 is adhered to the surface 2, a method in which the base sheet is peeled off and only the transfer layer 3 is transferred may be used.

First, the transfer material 8 will be described.

Examples of the material of the base sheet include resin sheets such as polypropylene-based resin, polyethylene-based resin, polyamide-based resin, polyester-based resin, acrylic-based resin and polyvinyl chloride-based resin; metal foils such as aluminum foil and copper foil; What is used as a base sheet of the ordinary transfer material 8, such as glassine paper, coated paper, a cellulosic sheet such as cellophane, or a composite of the above sheets can be used.

In the case where the transfer layer is easily separated from the base sheet, the transfer layer may be provided directly on the base sheet. In order to improve the releasability of the transfer layer from the base sheet, a release layer may be formed over the entire surface before providing the transfer layer on the base sheet. The release layer is released from the transfer layer together with the base sheet when the base sheet is peeled off after the transfer or the simultaneous transfer with molding. As the material of the release layer, a melamine resin-based release agent, a silicone resin-based release agent, a fluororesin-based release agent, a cellulose derivative-based release agent, a urea resin-based release agent, a polyolefin resin-based release agent, Paraffin-based release agents, composite release agents thereof, and the like can be used. Examples of the method for forming the release layer include a coating method such as a roll coating method and a spray coating method, and a printing method such as a gravure printing method and a screen printing method.

The release layer is formed entirely or partially on the base sheet or the release layer. The release layer is a layer which becomes the outermost layer of the transferred material by being separated from the base sheet or the release layer when the base sheet is separated after the transfer or the simultaneous transfer with the molding. Examples of the material of the release layer include acrylic resin, polyester resin, polyvinyl chloride resin, cellulose resin, rubber resin, polyurethane resin, polyvinyl acetate resin, and the like, as well as vinyl chloride-vinyl acetate copolymer. It is preferable to use a copolymer such as a resin. When the release layer requires hardness, a photocurable resin such as an ultraviolet curable resin, a radiation curable resin such as an electron beam curable resin, or a thermosetting resin may be selected and used. The release layer may be colored or uncolored. As a method for forming the release layer, there are a coating method such as a gravure coating method, a roll coating method, and a comma coating method, and a printing method such as a gravure printing method and a screen printing method.

The design layer is formed on the release layer, usually as a printing layer. As a material of the printing layer, a resin such as a polyvinyl resin, a polyamide resin, a polyester resin, an acrylic resin, a polyurethane resin, a polyvinyl acetal resin, a polyester urethane resin, a cellulose ester resin, and an alkyd resin is used as a binder. ,
It is preferable to use a coloring ink containing a pigment or dye of an appropriate color as a coloring agent. As a method for forming the printing layer, a normal printing method such as an offset printing method, a gravure printing method, or a screen printing method may be used. In particular, an offset printing method or a gravure printing method is suitable for performing multicolor printing and gradation expression. In the case of a single color, a coating method such as a gravure coating method, a roll coating method, and a comma coating method can be adopted. The printing layer may be provided entirely or partially depending on the design to be expressed.

The design layer may be composed of a metal thin film layer or a combination of a printed layer and a metal thin film layer. The metal thin film layer is for expressing metallic luster as a design layer, and is formed by a vacuum evaporation method, a sputtering method, an ion plating method, a plating method, or the like. Aluminum, nickel, gold, platinum, chromium, iron, copper, tin, indium,
Metals such as silver, titanium, lead, and zinc, and alloys or compounds thereof are used. As an example of forming a partial metal thin film layer, after forming a solvent-soluble resin layer on a portion that does not require a metal thin film layer, a metal thin film is entirely formed on the resin-soluble resin layer, and solvent cleaning is performed by solvent cleaning. There is a method of removing an unnecessary metal thin film together with the resin layer. The solvent often used in this case is water or an aqueous solution. As another example, there is a method in which a metal thin film is formed on the entire surface, a resist layer is formed on a portion where the metal thin film is to be left, and the resist layer is removed by etching with an acid or an alkali. . When the metal thin film layer is provided, a front anchor layer or a rear anchor layer may be provided in order to improve the adhesion between another transfer layer and the metal thin film layer. As the material of the front anchor layer and the rear anchor layer, two-component cured urethane resin, thermosetting urethane resin, melamine resin, cellulose ester resin, chlorine-containing rubber resin, chlorine-containing vinyl resin, acrylic resin, epoxy It is preferable to use a resin such as a vinyl resin or a vinyl copolymer resin. As a method of forming the front anchor layer and the rear anchor layer, a gravure coating method,
There are coating methods such as a roll coating method and a comma coating method, and printing methods such as a gravure printing method and a screen printing method.

The adhesive layer is formed on the design layer. The adhesive layer is for bonding each of the above layers to the surface of the panel base 2. As the adhesive layer, a heat-sensitive or pressure-sensitive resin suitable for the material of the panel base 2 is appropriately used. For example, when the material of the panel base 2 is an acrylic resin, an acrylic resin may be used. The material of the panel base 2 is polyphenylene oxide / polystyrene resin,
In the case of a polycarbonate-based resin, a styrene copolymer-based resin, or a polystyrene-based blended resin, an acrylic resin, a polystyrene-based resin, a polyamide-based resin, or the like having affinity for these resins may be used. Further, when the material of the panel base 2 is a polypropylene resin, chlorinated polyolefin resin, chlorinated ethylene-vinyl acetate copolymer resin, cyclized rubber, and coumarone indene resin can be used. As a method of forming the adhesive layer, a gravure coating method,
There are coating methods such as a roll coating method and a comma coating method, and printing methods such as a gravure coating method and a screen printing method.

The configuration of the transfer layer 3 is not limited to the above-described embodiment. For example, when a material having excellent adhesion to the panel base 2 is used as the material of the design layer, the adhesive layer Can be omitted.

Using the transfer material 8 having the above-described layer configuration, the preformed panel base 2 having the protrusions 5
The method of decorating the surface of the device will be described. First, the transfer material 8 is overlaid on the surface of the panel base 2 made of resin from the adhesive layer side. Next, using a heating / pressing machine such as a roll heating / pressing machine equipped with a heat-resistant rubber-like elastic body such as silicon rubber or an up / down heating / pressing machine, at a temperature of about 80 to 260 ° C. and a pressure of about 50 to 200 kg / m ^2. Heat and pressure are applied from the base sheet side of the transfer material 8 via the heat-resistant rubber-like elastic material set in the above. By doing so, the adhesive layer adheres to the surface of the panel base 2. Finally, when the base sheet is peeled off after cooling, peeling occurs at the interface between the base sheet and the release layer, and the transfer is completed, whereby the display panel 1 can be obtained.

Next, a method of decorating the surface of the panel base 2 simultaneously with injection molding using the transfer material 8 will be described. First, a molding die 9 composed of a movable die and a fixed die
The transfer material 8 is fed into the inside (see FIG. 9). The molding die 9
The cavity surface is constituted by a single curved surface or a flat surface, and the mold 9 corresponding to the transmission portion 4 on the back surface of the panel base 2 is constituted by a concave portion. Further, the transfer material 8 of a single sheet may be fed one by one, or a necessary portion of a long transfer material may be fed intermittently. When a long transfer material 8 is used, it is preferable to use a feeding device having a positioning mechanism so that the register between the symbol layer of the transfer material 8 and the molding die 9 coincides with each other. When the transfer material 8 is intermittently fed, the transfer material 8
If the transfer material 8 is fixed by the movable mold and the fixed mold after the position of the transfer material 8 is detected by the sensor, the transfer material 8 can be fixed at the same position at all times, and there is no displacement of the design layer, which is convenient. It is. After closing the molding die 9, the molten resin is injected and filled into the cavity from the gate provided on the fixed die,
At the same time when the panel base 2 is formed, the transfer material 8
(See FIG. 10). After the panel base 2 is cooled, the transfer is completed and the display panel 1 can be obtained by peeling off the base sheet at the same time as opening the molding die 9.

In order to obtain the display panel 1 by providing the decorative film 10 on the surface of the resin-made panel base 2, the decorative film 1 having a pattern layer, an adhesive layer and the like formed on a base sheet is provided.
It is preferable to use a method of bonding the decorative film 10 to the panel base 2 using 0. Further, as a method of providing the decorative film 10 on the surface of the resin-made panel base 2 more rationally, there is an insert molding method. What is insert molding?
A decorative film 10 cut or preformed in a desired shape in advance is supplied into an injection molding die 9 and the decorative film 10 is simultaneously formed with the panel base 2 at the same time as the molding of the panel base 2.
It is a method of sticking integrally to the. In the insert molding method, since the decorative film 10 can be attached simultaneously with the molding in the mold 9, the manufacturing process can be greatly simplified. Further, since the decorative film 10 is stretched by the injection pressure of the molten resin and follows the mold 9, there is an advantage that a three-dimensional display panel can be easily obtained.

First, the decorative film 10 will be described.

As the material of the base sheet, a resin sheet such as a polypropylene resin, a polyethylene resin, a polyamide resin, a polyester resin, an acrylic resin, a polyvinyl chloride resin, a cellulosic sheet such as cellophane, or the above A transparent or translucent material may be used as a substrate sheet of the ordinary decorative film 10, such as a laminate of each sheet. Further, a base sheet coated on both sides may be used.

The design layer may be formed in the same manner as the transfer material 8.

The adhesive layer is for bonding each of the above layers to the surface of the panel base 2. The adhesive layer is formed entirely on the design layer. The adhesive layer may be formed in the same manner as the transfer material 8.

A method of decorating the surface of the previously formed panel base 2 having the projections 5 using the decorative film 10 having the above-described layer structure will be described. First, the decorative film 10 is overlaid on the surface of the resin-made panel base 2 from the side of the adhesive layer. Next, using a heating / pressing machine such as a roll heating / pressing machine equipped with a heat-resistant rubber-like elastic body such as silicon rubber, and an up / down heating / pressing machine, the temperature is 80 to
Decorative film 10 via a heat-resistant rubber-like elastic body set at about 260 ° C. and pressure of about 50 to 200 kg / m ^2.
Heat and pressure are applied from the side of the base sheet. By doing so, the decorative film 10 adheres to the surface of the panel base 2 and the display panel 1 can be obtained.

Next, an insert molding method using the decorative film 10 will be described. First, the decorative film 10 is fed into a molding die 9 composed of a movable die and a fixed die (see FIG. 9). The molding die 9 has a cavity surface formed of a single curved surface or a flat surface, and the transmission portion 4 on the back surface of the panel base 2.
The mold 9 corresponding to the above is configured to be concave. Further, the decorative film 10 may be fed one by one, or a necessary portion of the long decorative film 10 may be sent intermittently. When the long decorative film 10 is used, the register between the design layer of the decorative film 10 and the molding die 9 may be matched by using a feeding device having a positioning mechanism. Also, when the decorative film 10 is intermittently fed, if the decorative film 10 is fixed by the movable mold and the fixed mold after the position of the decorative film 10 is detected by the sensor, the decorating film 10 is always fixed at the same position. The decorative film 10 can be fixed, and the pattern layer is not misaligned, which is convenient. Here, the decorative film 10 may be heated so that the decorative film can easily follow the mold. For heating, an infrared heater, a nichrome heater, or the like may be arranged near the decorative film 10. After the molding die 9 is closed, the molten resin is injected and filled into the cavity from the gate provided in the fixed die, and the decorative film 10 is adhered to the surface of the panel base 2 simultaneously with the formation of the panel base 2 (see FIG. 10). . After cooling the molded product, the molding die is opened, the molded product is taken out, insert molding is completed, and the display panel 1 can be obtained.

[0040]

【Example】

Example 1 A 25 μm-thick long polyester film subjected to a release treatment was used as a base sheet, a release layer made of an acrylic resin was provided thereon by a gravure printing method, and a pattern layer and a gravure printing method were further provided. An adhesive layer was provided to obtain a transfer material.
The design corresponding to the LED was a colored window that transmits visible light, and the design corresponding to the light-receiving element for remote control was designed to be invisible to the surrounding design in gray that transmits infrared light. The visible light transmittance of the portion corresponding to the LED is 9
It was 0%. The visible light transmittance at the position corresponding to the remote control light-receiving element was 15%, and the infrared light transmittance was 92%.

After inserting the long transfer material into an injection mold and injecting the molten transparent AS resin to obtain the panel base and simultaneously bonding the transfer material to the surface of the panel base, the base sheet is formed. Is peeled off, and only the transfer layer is transferred, so that a thickness of 5.0 m having a transmitting portion of visible light from the LED on the back surface or infrared light to the light receiving element for remote control on the back surface is obtained.
m were obtained. This display panel has a truncated-cone projection protruding 3.0 mm from a peripheral 2.0-mm-thick portion on each transmissive portion on the back surface of the panel base.

The possible viewing light transmittance of the transmitting portion corresponding to the LED of the display panel thus obtained was 85%.
The possible viewing light transmittance of the transmitting portion corresponding to the light-receiving element for remote control was 12%, and the infrared transmittance was 85%. Also, L
When the ED was turned on, the light was converged, and a dot-like display with high luminance was obtained. In addition, it was recognized as a pattern from the outside, and it was possible to operate from a position 5 m away by infrared light of 940 nm emitted from a remote controller.

Example 2 A polyester film having a thickness of 100 μm was used as a base sheet, and a pattern layer and an adhesive layer were provided thereon by gravure printing to obtain a decorative film. No design was provided at the location corresponding to the LED, and the design at the portion corresponding to the light-receiving element for the remote control was designed to be gray and transparent to infrared rays and to be blended into the surrounding design. The possible viewing light transmittance at the location corresponding to the LED was 96%. The possible viewing light transmittance at the location corresponding to the light-receiving element for remote control was 20%, and the infrared transmittance was 80%.

Inserting the decorative film into the injection mold,
By injecting a molding resin colored in gray smoke with a dye to obtain a panel base and attaching a decorative film to the surface of the panel base, visible light from the LED on the back or infrared light to the light-receiving element for remote control on the back A display panel having a thickness of 5.0 mm and a transmission portion of the above was obtained. This display panel has columnar projections protruding 3.0 mm from a peripheral 2.0 mm thick portion on each transmissive portion on the back surface of the panel base.

The possible viewing light transmittance of the transmitting portion corresponding to the LED of the display panel thus obtained was 80%.
The possible viewing light transmittance of the transmitting portion corresponding to the light-receiving element for remote control was 10%, and the infrared transmittance was 75%. Also, L
When the ED was turned on, the light was converged, and a dot-like display with high luminance was obtained. In addition, it was recognized as a pattern from the outside, and it was possible to operate from a position 5 m away by infrared light of 940 nm emitted from a remote controller.

[0046]

Since the present invention has the above-described structure,
It has the following effects.

Since the transparent portion of the visible light from the LED on the rear surface of the panel base has a columnar or frustum-shaped projection, the visible light from the LED is guided to the surface of the panel base while being reflected within the projection. Therefore, when viewed through the display panel, the dimming due to diffusion is significantly suppressed, and the LED
Looks high.

Also, since the infrared transmitting portion to the light receiving element for the remote controller on the rear surface of the panel base has a columnar or frustum-shaped projection, the infrared ray from the remote controller is reflected in the projection and the remote controller on the rear surface of the panel base. To the light receiving element for use. Therefore, the dimming due to diffusion is remarkably suppressed, and the portion incorporating the remote control light receiving element has high sensitivity of the remote control and can reliably operate.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a display panel according to the present invention.

FIG. 2 is a sectional view showing one embodiment of a display panel according to the present invention.

FIG. 3 is a perspective view showing one embodiment of a projection of a display panel according to the present invention.

FIG. 4 is a perspective view showing one embodiment of a projection of the display panel according to the present invention.

FIG. 5 is a perspective view showing one embodiment of a projection of the display panel according to the present invention.

FIG. 6 is a perspective view showing one embodiment of a projection of the display panel according to the present invention.

FIG. 7 is a perspective view showing one embodiment of a projection of the display panel according to the present invention.

FIG. 8 is a perspective view showing one embodiment of a projection of the display panel according to the present invention.

FIG. 9 is a cross-sectional view showing one embodiment of each step of the display panel manufacturing method according to the present invention.

FIG. 10 is a cross-sectional view showing one embodiment of each step of the display panel manufacturing method according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display panel 2 Panel base 3 Transfer layer 4 Transmissive part 5 Projection 6 LED 7 Remote control light receiving element 8 Transfer material 9 Die 10 Decorative film

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[Procedure amendment]

[Submission date] June 17, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction contents]

In order to obtain the display panel 1 by providing the decorative film 10 on the surface of the resin-made panel base 2, the decorative film 1 having a pattern layer, an adhesive layer and the like formed on a base sheet is provided.
It is preferable to use a method of bonding the decorative film 10 to the panel base 2 using 0. Further, as a method of providing the decorative film 10 on the surface of the resin-made panel base 2 more rationally, there is an insert molding method. What is insert molding?
A decorative film 10 cut or preformed into a desired shape in advance is supplied into an injection molding die 9, and the decorative film 10 is simultaneously formed with the panel base 2.
It is a method of sticking integrally to the. In the insert molding method, since the decorative film 10 can be attached simultaneously with the molding in the mold 9, the manufacturing process can be greatly simplified. Further, since the decorative film 10 is stretched by the injection pressure of the molten resin and follows the mold 9, there is an advantage that a three-dimensional display panel can be easily obtained.

Claims (8)

[Claims] 1. A display panel having a transfer layer on the surface of a resin-made panel base and transmitting a visible light from an LED on the rear surface or an infrared ray to a light-receiving element for remote control on the rear surface. Has a columnar or frustum-shaped projection. 2. A display panel having a decorative film on the surface of a resin-made panel base and transmitting a visible light from an LED on the rear surface or an infrared ray to a light-receiving element for remote control on the rear surface. A display panel characterized in that the portion has a columnar or frustum-shaped projection. 3. The display panel according to claim 1, wherein a visible light transmittance or an infrared transmittance of the transmission portion of the display panel is 50% or more. 4. A transfer material having a transfer layer formed on a base sheet is superimposed on a surface of a resin panel base, and the transfer material is adhered to the panel base by applying heat and pressure. By transferring only the back LE
A method for producing a display panel having a transmission portion for transmitting visible light from D or infrared light to a light-receiving element for remote control on the rear surface, wherein the transmission portion on the rear surface of the panel base has a columnar or frustum-shaped projection. Panel manufacturing method. 5. A transfer material having a transfer layer formed on a base sheet is sandwiched between molding dies, a molten resin is injected and filled in the dies, and cooled to obtain a panel base. A method for producing a display panel having a transmitting portion of visible light from an LED on the back or an infrared ray to a light-receiving element for remote control on the back by transferring only the transfer layer after peeling off the base sheet after bonding the transfer material. 3. A method of manufacturing a display panel according to claim 1, wherein a mold portion corresponding to the transmission portion on the back surface of the panel base is formed as a recess, and a columnar or frustum-shaped projection is formed on the panel base. 6. A decorative film is superimposed on the surface of a resin panel base, and the decorative film is adhered to the panel base by applying heat and pressure to the visible light from the LED on the rear surface or to the light receiving element for remote control on the rear surface. A method for producing a display panel having a transparent portion for infrared rays as described above, wherein the transparent portion on the back surface of the panel base has a columnar or frustum-shaped projection. 7. A decorative film sandwiched between molding dies,
Injecting and filling the molten resin into the mold, cooling it to obtain the panel base, and simultaneously attaching a decorative film to the panel base surface, allowing visible light from the LED on the back or the light-receiving element for the remote control on the back. A method for producing a display panel having an infrared transmitting portion, wherein a column-shaped or frustum-shaped projection is formed on a panel base with a mold portion corresponding to a transmitting portion on a back surface of a panel base formed as a recess. Manufacturing method. 8. The visible light transmittance or the infrared light transmittance of the transmission portion of the display panel is 50% or more.
8. The method for manufacturing a display panel according to any one of 7.