JP2000276967A - Lighting structure of switch and method of manufacturing display panel - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the visibility of the external appearance of an operation switch. SOLUTION: An impermeable first layer portion 14 and a non-layer portion 15 having a shape along the outer periphery of a switch are formed on one surface of a resin film of a display panel 2, and a non-layer portion is formed on the other surface. A second layer portion 16 that is opaque symmetrically to the portion was formed. The display panel 2 includes a light-transmitting resin substrate 13. Resin film 1
2, a transparent symbol mark was formed, and the light guide 4 for irradiating the symbol mark was arranged to face the layer portion 16. The layer portion 16 may be formed in a halftone dot shape. As a method of manufacturing the display panel, an impermeable first layer portion 14 is printed on one surface of the resin film 12 while leaving a non-layer portion 15 having a shape along the outer periphery of the operation switch 1 to be attached later. On the other surface, a second layer portion 16 that is opaque symmetrically to the non-layer portion is printed. When the resin substrate 13 is impermeable, an opening for light transmission is provided in the resin substrate corresponding to the layer portion 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch illumination structure in which the outline of a switch for operating an air conditioner, audio or the like in a vehicle is clarified by indirect lighting to improve the operability of the switch at night or the like. The present invention relates to a method for manufacturing a display panel for obtaining the lighting structure.

[0002]

2. Description of the Related Art FIGS.
1 shows a conventional lighting structure of a switch for an automobile described in Japanese Patent Application Publication No. 69-69. In FIG. 12, 41 is a push switch for operation, and 42 is a push switch 41.
The light guides made of an optical resin are denoted by reference numerals 43 and 44 are light-emitting bodies L
ED, lamp, and 45 indicate switch contact portions.

The push switch 41 protrudes from a control panel 46. On the top (display surface) of the push switch 41, as shown in FIG. 13, a symbol mark 47 for displaying a display of an air conditioner or switching between inside and outside air and the like is formed by means such as printing, two-color molding, laser processing, and pasting. . The symbol mark 47 may be light transmissive.

In FIG. 12, light from an LED 43 or a lamp 44 is reflected by a reflection surface 48 of a light guide 42, guided to a display surface of a push switch 41 along the light guide 42, and illuminates a symbol mark 47. The lamp 44 is turned on when the ignition switch of the vehicle is turned on, and the LED 43 is turned on when the switch contact 45 is turned on. The symbol mark 47 is displayed in a mixed color of the LED 43 and the lamp 44.

[0005] However, in the above-mentioned conventional switch lighting structure, it is possible to sufficiently determine the switch function at night, but since the appearance of the push switch 41 looks blurry, it is difficult to determine where to press at the time of operation. There was a problem that it was difficult to understand. To solve such a problem,
For example, a structure has been proposed in which a ring-shaped light guide (not shown) is provided around the periphery of a large-diameter dial switch (not shown) to illuminate the outside of the switch. However, there has been a problem that the cost is increased and the unevenness of the illumination luminance is apt to occur.

On the other hand, FIG. 14 shows an illumination structure of a switch similar to that described in Japanese Patent Application Laid-Open No. 9-55262. In FIG. 14, reference numeral 51 denotes a display panel made of a synthetic resin which forms a part of a center cluster located at the center of an instrument panel of an automobile;
A reference numeral 53 denotes a light guide made of an optical resin, and 54 denotes a light guide case made of a synthetic resin.

The display panel 51 has openings 55 and 5 for exposing dial switches and push switches (not shown).
6 are provided. Nameplate 52 around openings 55 and 56
Is fixed. On the nameplate 52, a symbol mark (picture) 57 indicating the type of switch, the operation direction, and the like is formed by means such as printing.

The light guide 53 is arranged to face each symbol mark 57 of a dial switch or a push switch. The light guide case 54 is arranged on the back side of the display panel 51 in a state where the light guide 53 is housed. Each symbol mark 5
7 is illuminated with light guided from a light emitter (not shown) via a light guide 53, and the type and operation direction of the switch are specified.

However, in the above-described conventional switch lighting structure, the number of steps for attaching the name plate 52 is increased, and the flat plate 5 is attached to the curved portion of the display panel 51.
2 is difficult to attach.
In order to solve this problem, the present applicant has previously proposed a display panel manufacturing method in which the nameplate 52 and the display panel 51 are integrated by two-color molding.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of each structure, and clearly indicates where to press a switch at night, so that switch operation can be performed without fail. In addition, it is an object of the present invention to provide a switch lighting structure having a simple and inexpensive structure and to provide a display panel manufacturing method capable of easily and inexpensively manufacturing the switch lighting structure.

[0011]

In order to achieve the above object, according to the present invention, a display panel is provided with an operation switch,
In a switch illumination structure for illuminating an outer peripheral side of the switch from a back side of the display panel, the display panel includes a light-transmissive resin film, and an impermeable first layer portion on one surface of the resin film. A non-layered portion having a shape along the outer periphery of the switch is formed, and on the other surface of the resin film,
An impermeable second layer portion is formed symmetrically to the non-layer portion (claim 1). It is also effective that the first layer portion and the non-layer portion are formed on the front surface side of the resin film, and the second layer portion is formed on the back surface side of the resin film (claim 2). . It is also effective that the display panel is composed of the resin film and a resin substrate, and the resin substrate is light-transmissive. Also,
It is also effective that a transparent symbol mark is formed on the resin film, and a light guide for irradiating the symbol mark is arranged on the back side of the display panel opposite to the second layer portion. 4). It is also effective that the second layer is formed in a halftone dot shape (claim 5). In order to obtain the illumination structure of the switch described above, the present invention provides a method for manufacturing a display panel in which a resin film is preformed into the shape of a display panel and a resin substrate is integrally formed on the back side of the resin film. Leaving a non-layer portion in the shape along the outer periphery of the switch, printing an impermeable first layer portion on one surface of the resin film, and on the other surface of the resin film, the non-layer portion and Prints a symmetrically impermeable second layer (claim 6). It is also effective to form the resin substrate with a light transmissive material (claim 7). It is also effective to form the resin substrate with an impermeable material and to form an opening for light transmission in the resin substrate corresponding to the second layer portion.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show one embodiment of a lighting structure of a switch according to the present invention. In FIG. 1, 1 is a synthetic resin operation dial switch (switch), 2 is a synthetic resin display panel,
Reference numeral 3 denotes a switch contact portion, and reference numeral 4 denotes a light guide made of an optical resin.

The dial switch 1 has a central tubular portion 5 press-fitted and fixed to a rotary shaft 6 on the switch contact portion 3 side. The display panel 2 is located around the dial switch 1, and the lower half of the dial switch 1 is housed in the circular recess 7 of the display panel 2. Outer peripheral surface 8 of dial switch 1
Is close to the peripheral wall 9 of the concave portion 7 of the display panel 2. The bottom wall 10 of the recess 7 is located close to the bottom of the dial switch 1, and the rotary shaft 6 is inserted into a central hole 11 of the bottom wall 10.

As shown in FIG. 2 (enlarged view of a portion A in FIG. 1),
The display panel 2 includes at least a resin film 12 on the front side and a resin substrate 13 on the back side. The resin film 12 and the resin substrate 13 are integrated by means such as two-color molding (the molding method will be described later). The resin film 12 is formed using a light-transmitting material from the front wall side of the display panel 2 to the middle part in the height direction of the peripheral wall 9 of the concave portion 7. The resin film 12 has a front portion 17 and a peripheral wall portion 1.
8 is provided. The resin film 12 may be colorless and transparent or colored and transparent. In this example, the resin substrate 13 is formed using a light-transmissive material like the resin film 12.

A non-transparent (non-translucent) outer layer (first layer) 14 is formed on the surface of the resin film 12 except for a part near the outer periphery of the dial switch 1 by means such as printing. It is formed with. A ring-shaped non-layered portion 15 is formed on the surface of the resin film 12 near the dial switch 1 (FIG. 1). On the back surface of the resin film 12, a ring-shaped impermeable inner layer (second layer) 16 is formed at a position corresponding to the non-layer 15 (symmetrically with the non-layer 15) by means such as printing. Have been. That is, the inner layer portion 16 is formed on the back side (symmetric position) of the non-layer portion 15. In the dial switch 1 (FIG. 1), a transparent symbol mark (not shown) is formed integrally with the outer layer portion 14.

The outer layer 14 and the inner layer 16 preferably have a dark color such as black or brown. Preferably, the width L of the non-layer portion 15 and the inner layer portion 16 is the same, and the width L may be narrow. The positions of the non-layer portion 15 and the inner layer portion 16 are preferably close to the outer peripheral surface 8 (FIG. 1) of the dial switch 1 (FIG. 1).

The inner layer 16 is embedded in the resin substrate 13. The resin substrate 13 is formed to be thicker than the resin film 12 and makes the display panel 2 rigid. Most of the peripheral wall 9 of the recess 7 and all of the bottom wall 10 (FIG. 1) are formed by a resin substrate 13.

The ring-shaped light guide 4 for illuminating the symbol mark is arranged on the back side of the ring-shaped inner layer portion 16 near the outer side of the peripheral wall 9 of the concave portion 7. One end face 4a of the light guide 4
Is located with a small gap 19 between itself and the resin substrate 13, and faces the inner layer portion 16 via the resin substrate 13.
A recess 20 is formed on the other end surface side of the light guide 4, and an LED (light emitting diode) 21 as a light emitting body is arranged in the recess 20. At least two or more LEDs 21 are arranged equally on the circumference.

As shown in FIG. 3, the outer peripheral surface 8 of the dial switch 1
Adjacent to (close to) the ring-shaped inner layer portion 16 and the non-layer portion 15
(FIG. 2). The inner layer part 16 and the non-layer part 15 completely wrap up and down. In FIG. 3, 25 is a knob.

As shown in FIG. 4, an inner layer portion 16 and a non-layer portion (not shown) similar to those described above can be provided adjacent to (close to) an outer peripheral surface 24 of a push switch (switch) 23 for operation. is there. The push switch 23 is a conventional example (FIG. 1).
For example, as shown in 4), the dial switch 1 is arranged in the lower opening, and the dial switch 1 is arranged in the upper opening of the display panel (the reference numeral is omitted).

In the case of the push switch 23, the outer layer portion 14 (see FIG. 2) and the substantially rectangular ring-shaped non-layer portion 15 are formed on the surface side of the resin film 12 in the same manner as the dial switch 1 described above. A substantially rectangular ring-shaped inner layer portion 16 is formed on the back side of the resin film 12 corresponding to the layer portion 15. When the push switch 23 has a circular shape, both the non-layer portion 15 and the inner layer portion 16 are formed in a circular shape according to the outer shape of the push switch 23. Push switch 2
In the case of No. 3, a transparent or non-transparent symbol mark 26 is formed on the knob surface by printing or the like.

In a bright daytime period, the driver or the passenger operates the dial switch 1 or the push switch 23.
And the symbol mark 26 can be directly confirmed visually. When the light switch (not shown) of the vehicle is turned on in a tunnel or at night, the LED 21 shown in FIG.
Is emitted, and the light of the LED 21 is guided by the light guide 4, passes through the transparent resin substrate 13 from the one end face 4 a of the light guide 4, and is irradiated on the back surface side of the inner layer portion 16 of the resin film 12.

As shown by the arrow A in FIG. 5, the light passes through the transparent resin film 12 from both sides of the inner layer portion 16 and is led out from the non-layer portion 15 on the front surface side as light leakage light 27 to the outside.
That is, the light from the LED 21 (FIG. 2) is blocked by the inner layer portion 16 to provide indirect illumination, and the faint light 27 leaks out of the circular or rectangular ring-shaped non-layer portion 15.

Thus, the outer periphery of the dial switch 1 or the push switch 23 is lightly illuminated, and the shape (outline) or position of the dial switch 1 or the push switch 23 is displayed easily on the eyes. In particular, since the distance between the ring-shaped inner layer portion 16 and the non-layer portion 15 is reduced by using the thin resin film 12, light from the light guide 4 is not directly radiated to the outside, so that indirect illumination is ensured. Is performed. Illumination of the symbol mark (see FIG. 10A) is also performed simultaneously with light from the LED 21. At night, in a tunnel, or the like, a driver or a passenger can easily visually recognize the outline of each of the switches 1 and 23, and can accurately perform the switch operation without fail.

In the above embodiment, the outer layer portion (first layer portion) 1 covers almost the entire surface of the resin film 12.
4, a ring-shaped non-layered portion 15 is formed on a part of the outer layer portion 14, and a ring-shaped inner layer portion (second layer portion) 16 is formed on the back surface of the resin film 12 corresponding to the non-layered portion 15. As shown in FIG. 6, a ring-shaped outer layer (second layer) 16 'is formed on the front side of the resin film 12', and the inner layer is formed almost entirely on the back side of the resin film 12 '. In addition to forming the portion (first layer portion) 14 ', it is also possible to form a ring-shaped non-layer portion 15' at a symmetric position of the outer layer portion 16 '.

In this case, the transparent symbol mark (FIG. 1)
0 (a) may be formed on the front side of the resin film 12 'by printing or the like, or the inner layer portion 14' on the back side may be formed.
And may be formed integrally. The symbol mark does not necessarily need to be transparent.

In the example of FIG. 6, the transparent resin substrate 1
Light introduced into the resin film 12 'from the non-layer portion 15' via the 3 'is reflected and diffused to the back surface of the outer layer portion 16', and as a light leaking from both sides of the outer layer portion 16 'as indicated by an arrow B, the light is externally reflected. Is derived. The outer layer portion 16 'is extended to one side of the outer layer portion 16' as shown by a chain line, and the non-layer portion 28 is formed in a ring shape only on the other side (closer to the switch 1) of the outer layer portion 16 '. It is also possible to emit the leaked light in a single ring shape.

As shown in FIG. 7, a light-emitting body (lamp) 3 is formed by using a reflection plate 29 instead of the light guide 4 (FIG. 2).
Light from 0 may be reflected toward the ring-shaped inner layer portion 16 or a symbol mark (not shown) as indicated by an arrow C.
Also in the example of FIG. 7, the ring-shaped inner layer portion 16 and the non-layer portion 15 are formed.
May be on either side of the resin film 12.

The ring-shaped light guide 4 and the reflecting plate 29 are mainly for illuminating the symbol mark of the dial switch 1, and indirectly illuminate the outer periphery of the dial switch 1 and the push switch 23 (FIG. 4). For this purpose, the ring-shaped inner layer portion 16 or the outer layer portion 1 can be formed by the light-emitting members 21 and 30 such as lamps without using the expensive light guide 4 and the reflection plate 29.
6 'may be directly irradiated.

As shown in FIG. 8, when an impermeable resin substrate 31 is used, the resin substrate 31 has an inner layer corresponding to the ring-shaped inner layer 16 and the ring-shaped outer layer 16 'of FIG. By providing the ring-shaped opening 32 larger than the portion 16 and the outer layer portion 16 ′ (FIG. 6), light from the light emitter can be introduced into the transmissive resin film 12. The resin substrate 31 is colored, such as black or brown. When the resin substrate 13 (FIG. 2) is transmissive, the light guide 4 (FIG. 2) may be formed integrally with the resin substrate 13.

As a method of tuning the illuminance unevenness of light leaked from the resin film 12 (FIG. 2), a ring-shaped inner layer portion 16 on the back surface of the resin film 12 or a ring-shaped outer layer portion 16 '(FIG. It is possible to apply a known technique such as halftone dot to 6). A halftone dot is a plurality of impermeable points such as black that intersect in a mesh pattern. The denser the halftone dot, the less light leaks, and the rougher the halftone dot, the more leak light. Utilizing this principle, for example, the luminous body (21)
The ring illumination without unevenness in illuminance can be obtained by making the halftone dots dense near and the halftone dots gradually become coarser as the distance from the light emitter increases.

In each of the embodiments described above, a transparent symbol mark is formed on a black face by film forming,
Further, the present invention can be applied to a multi-switch in which a lighting position is switched within one push switch according to a function.

FIGS. 9 to 11 show one embodiment of a method of manufacturing a display panel in the illumination structure of the switch. This display panel manufacturing method is an application of the display panel manufacturing method proposed by the present applicant in Japanese Patent Application No. 9-241487.

That is, as shown in FIG. 9, a transparent symbol mark 35 and a ring-shaped non-layered portion 15 (FIG. 10) are formed on the surface of a sheet-shaped flexible light-transmitting resin film 12.
(b)) and an impermeable outer layer portion (first layer portion) 14 having a ring-shaped impermeable inner layer portion (second Layer part) 16
(FIG. 10B) is printed by means such as transfer.

Next, as shown in FIGS. 10 (a) and 10 (b), the resin film 12 is applied to the display panel 2 using a molding die (not shown).
It is preformed three-dimensionally into the shape shown in FIG. This preforming is performed by means such as vacuum forming or pressure forming. An inner peripheral surface 18 of a circular opening 36 for accommodating the dial switch 1 (FIG. 1), an outer layer portion 14 is formed on the film surface outside the opening 36, and an annular non-layer is formed on the film surface near the opening 36. A portion 15 (FIG. 10B) is formed, and a ring-shaped inner layer portion 16 is formed on the back surface of the film corresponding to the non-layer portion 15.
(FIG. 10 (b)) is formed. Push switch 2
The same applies to the rectangular opening 37 for accommodating 3 (FIG. 4), so that illustration and description are omitted. Resin film 12
Unnecessary portion 12a around is cut by trimming.

Further, as shown in FIG. 11, in a state where the resin film 12 is placed in the molding dies 39 and 40, a permeable resin is injected into the back surface of the resin film 12 by injection molding, and Thick resin substrate 1
Form 3 Thus, the display panel 2 is completed.

In FIG. 9, a ring-shaped impermeable outer layer (second layer) 16 ′ is formed on the surface of the resin film 12.
(FIG. 6) is printed, and an impermeable inner layer portion (first layer portion) 14 ′ and a ring-shaped non-layer portion 1 are formed on the back surface of the resin film 12.
It is also possible to print 5 'and transparent symbol marks. Alternatively, the resin substrate 13 may be formed of an impermeable material, and the light transmitting opening 32 (FIG. 8) may be formed in the resin substrate 13 corresponding to the inner layer portion 16.

According to the display panel manufacturing method described above,
The outer layer portion 14, the symbol mark 35, and the inner layer portion 16 (FIG. 10B) can be easily formed on the flat resin film 12 of FIG. 9 by means such as transfer. Further, the flexible resin film 12 on which the outer layer portion 14, the inner layer portion 16, and the like are printed can be easily preformed into the shape of the display panel 2 using a molding die. By preforming the resin film 12 into a required shape, the rigid resin substrate 13 can be easily integrally formed with the resin film 12. The two-color molding of the resin film 12 and the resin substrate 13 enables the combination of the light-transmitting resin film 12 and the impermeable resin substrate 31 (FIG. 8).

Even when the light-transmitting resin substrate 13 is used, the ring-shaped inner layer portion 16 (FIG. 2) is sandwiched between the resin film 12 and the resin substrate 13 and the inner layer portion 16 is peeled off. Is prevented, and the distance between the inner layer portion 16 and the non-layer portion 15 is reduced by the thin resin film 12, so that the light from the light guide 4 (FIG. 2) reliably interferes with the inner layer portion 16, and Indirect lighting is performed.

For example, when the inner layer 16 is formed on the back surface of the light-transmitting resin substrate 13, the inner layer 16 and the non-layer
5, the probability that the light from the light guide 4 is directly radiated to the outside increases, stimulating the eyes of the driver or the like, obstructing the driving operation, and the contours of the switches 1 and 23. Is also difficult to see. The display panel 2 is composed of the resin film 12 and the resin substrate 13 in two layers also in order to solve the problem. Needless to say, this effect is similarly exhibited in the illumination structure of the switch.

In place of the above molding method, it is also possible to adopt a method of bonding a printed nameplate to a display panel as shown in the conventional example (FIG. 14). In this case, the name plate corresponds to the resin film 12, and the layer portions 14, 16 and the symbol mark 35 are printed on the name plate in advance. The nameplate is bonded to the resin substrate 13.

[0042]

As described above, according to the first aspect of the present invention, light interferes with the second layer portion of the resin film in the display panel and is indirectly irradiated to the outside. The switch outline is lightly illuminated, and the visibility of the switch at night or the like is improved. Thereby, erroneous operation of the switch is prevented, and accurate switch operation becomes possible. In particular,
By using a thin resin film, the distance between the second layer part and the non-layer part on the front and back of the resin film becomes narrower, the probability that light is directly radiated to the outside becomes extremely low, and reliable indirect lighting Is performed, the contour of the switch is gently displayed by the faint light without stimulating the driver's eyes. Further, since a conventional expensive ring-shaped light guide for specifying the contour of the switch is not required, the structure is simplified and the cost is reduced. According to the second aspect of the present invention, light leaks out around the switch in a non-layered portion on the front surface side of the resin film, so that the outline of the switch is further clarified. According to the third aspect of the present invention, since the light is irradiated to the resin film through the transparent resin substrate, it is not necessary to form a hole for light transmission in the resin substrate, and the rigidity of the display panel is secured. And the cost associated with drilling is reduced. According to the fourth aspect of the present invention, the illumination of the symbol mark and the clarification of the outline of the switch are simultaneously performed by one light guide, so that the structure is simplified and the cost is reduced.
According to the fifth aspect of the present invention, it is possible to obtain indirect illumination without illuminance unevenness by appropriately changing the shading of the halftone dots of the second layer according to the position of the light-emitting body (light source). .
According to the invention of claim 6, in addition to the effect of the invention of claim 1, the first layer portion, the non-layer portion, and the second layer portion are easily formed on the resin film by printing. Therefore, it is possible to easily and inexpensively manufacture a display panel that clearly shows the outline of the switch. In addition, by printing, the degree of freedom in the design of each layer portion is improved, it is possible to easily cope with switches having various external shapes, and the symbol mark can be printed at the same time. Further, by integrally molding the resin substrate with the resin film, the rigidity of the display panel is improved. According to the seventh aspect of the present invention, since the light is applied to the resin film through the transparent resin substrate, it is not necessary to form a light transmitting hole in the resin substrate, and the rigidity of the display panel is secured. And the cost associated with drilling is reduced. Further, according to the invention of claim 8, since the light is directly applied to the resin film from the opening portion without passing through the resin substrate, the illuminance of the light does not decrease and clear indirect illumination can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a lighting structure of a switch according to the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a front view showing a dial switch according to the present invention.

FIG. 4 is a front view showing the same push switch.

FIG. 5 is a vertical sectional view showing a main part of the switch in the lighting structure.

FIG. 6 is an essential part longitudinal cross sectional view showing an embodiment in which a first layer portion and a second layer portion are arranged in reverse.

FIG. 7 is a longitudinal sectional view of a main part showing an embodiment using a reflector.

FIG. 8 is a vertical sectional view of a main part showing an embodiment in which an opening is provided in a resin substrate.

FIG. 9 is a perspective view showing a first step in a method for manufacturing a display panel.

10A is a perspective view showing a second step of the method for manufacturing a display panel, and FIG. 10B is a longitudinal sectional view of the same.

FIG. 11 is a longitudinal sectional view showing a third step of the method for manufacturing a display panel.

FIG. 12 is a longitudinal sectional view showing an example of a conventional switch illumination structure.

FIG. 13 is a front view of the same.

FIG. 14 is an exploded perspective view showing another example of the illumination structure of the conventional switch.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 dial switch (switch) 2 display panel 4 light guide 12, 12 ′ resin film 13 resin substrate 14 outer layer (first layer) 14 ′ inner layer (first layer) 15, 15 ′ non-layer part 16 Inner Layer (Second Layer) 16 'Outer Layer (Second Layer) 23 Push Switch (Switch) 32 Opening 35 Symbol Mark

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshifumi Kobayashi 1500 Onjuku, Susono City, Shizuoka Prefecture Yazaki Sogyo Co., Ltd. F-term (reference) 3K040 CA05 HA02 HB04 5G006 AZ01 JA01 JB03 JC02 JD02 JF01 JF21 LC04 5G019 JJ03 JJ08 LL02 SK02 SY01

Claims (8)

[Claims] An operation switch is provided on a display panel,
In a switch illumination structure for illuminating an outer peripheral side of the switch from a back side of the display panel, the display panel includes a light-transmissive resin film, and an impermeable first layer portion on one surface of the resin film. A non-layered portion having a shape along the outer periphery of the switch is formed, and on the other surface of the resin film,
An illumination structure for a switch, wherein an opaque second layer portion is formed symmetrically to the non-layer portion. 2. The method according to claim 1, wherein the first layer portion and the non-layer portion are formed on a front surface side of the resin film, and the second layer portion is formed on a back surface side of the resin film. An illumination structure for a switch according to claim 1. 3. The switch lighting structure according to claim 1, wherein the display panel is composed of the resin film and a resin substrate, and the resin substrate is light transmissive. 4. A transparent symbol mark is formed on the resin film, and a light guide for irradiating the symbol mark is arranged on the back side of the display panel opposite to the second layer portion. The lighting structure for a switch according to claim 1. 5. The switch lighting structure according to claim 1, wherein said second layer portion is formed in a halftone dot shape. 6. A method of manufacturing a display panel in which a resin film is preformed into a shape of a display panel and a resin substrate is integrally formed on the back side of the resin film, wherein a non-layered shape along the outer periphery of an operation switch to be retrofitted is provided. Part, printing an impermeable first layer part on one surface of the resin film,
A method for manufacturing a display panel, comprising printing a second layer portion impermeable symmetrically to the non-layer portion on the other surface of the resin film. 7. The method according to claim 6, wherein the resin substrate is formed of a light transmissive material. 8. The resin substrate according to claim 6, wherein the resin substrate is formed of an impermeable material, and an opening for light transmission is formed in the resin substrate corresponding to the second layer portion. The method for manufacturing the display panel described in the above.