JPH0590321U - Display device - Google Patents

Abstract

(57) [Abstract] [Purpose] Assembling workability is good, high-density mounting is possible, and it is possible to display without reducing the illuminance of the LED. An opaque member having a plurality of holes for emitting light of a light emitting element in a position facing the light emitting element in a display device for displaying an operation state of an electronic device by light emission of a plurality of light emitting elements arranged in a matrix. And a shielding plate mounted on a printed circuit board on which the light emitting element is mounted, the panel plate having a plurality of holes for accommodating the light emitting element independently, and the light transmitting member. In order to eliminate mutual interference between the light emitting elements, a light guide board which is formed between the shield plate and the panel plate and integrally formed with a light guide path communicating the holes of the shield plate and the panel plate is provided. The light of each light emitting element is emitted through the light guide path.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a display device for displaying an operating state of an electronic device by emitting light from a plurality of light emitting elements, and more particularly, to a display device having a high mounting density of light emitting elements without being affected by interference between the light emitting elements. Regarding

[0002]

[Prior Art]

 An electronic device such as a controller is provided with a display device that indicates an operating state so that the operating state can be always grasped. FIG. 4 is a block diagram of the controller, and FIG. 5 is an exploded block diagram showing a main part of a conventional display device provided in the controller. In the figure, 10 is a controller formed of a synthetic resin material, which is composed of a lid body 11 and a main body 12. The lid body 11 (hereinafter, referred to as panel 11) has a display device 2 for indicating an operation state of the device. 0 is provided.

In the display device 20, 21 is a printed board on which LEDs 22 which are light emitting elements are mounted, and 23 is a shield plate made of an opaque member so that each LED 22 is not affected by the light of the adjacent LED 22. A shield wall is provided on the LED 22 and surrounds the LED 22.

Reference numeral 24 denotes a light guide substrate made of a transparent material such as acrylic resin, which is provided on the shielding plate 23, and the light guide path 24 ₁ guides the light of the LED 22 to the window 11 ₁ of the panel 11, and the window part Emit from 11 ₁ . 11 ₂ with a shielding wall provided on the panel 11 side, engages the groove 24 ₂ engagement and provided between the light guiding path 24 _1, shields to prevent the incidence of light of the adjacent LED in the light guiding path 24 _1. FIG. 6 is a cross-sectional view of a main part of the display device shown in FIG. The light of the LED 22 is contained by the shield plate 23 and the shield wall 11 ₂ provided on the panel 11 side so as not to leak to the adjacent light guide path 24 ₁ .

FIG. 7 is a main-portion cross-sectional view showing another conventional display device. In the figure, components having the same functions as those in FIG. The same applies hereinafter in the drawings. The light guide path 25 is independently embedded in the panel 11 for each LED 22, and the light of the LED 22 is guided to the window 11 ₁ through the light guide path 25. Therefore, the light is not incident on the light guide paths 25 from the adjacent LEDs 22.

[0006]

[Problems to be solved by the device]

 Such a conventional display device has the following drawbacks. (1) In the method of providing a shielding wall on the panel side and shielding the light of an adjacent LED, it is not possible to increase the packaging density because of the space of the shielding wall. (2) In the method of independently providing the light guide path for each LED, the work of burying the light guide path in the panel is complicated, and in addition, it is necessary to finish the display surface having the light guide path.

The present invention has been made in view of the above points, and an object thereof is to provide a display device which has a good assembly workability, does not reduce the illuminance of the LED, and is capable of high-density mounting of LEDs. There is.

[0008]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides a display device for displaying an operating state of an electronic device by emitting light from a plurality of light emitting elements arranged in a matrix, wherein the light emitting element is provided at a position facing the light emitting element. A panel plate formed of an opaque member, and a plurality of holes formed of an opaque member for independently accommodating the light emitting element, and mounting the light emitting element. A shield plate mounted on the printed circuit board, and a light guide path that is formed between the shield plate and the panel plate by a light-transmissive member and connects the holes of the shield plate and the panel plate together. The formed light guide substrate is provided so that mutual interference between the light emitting elements is eliminated, and the light of each light emitting element is emitted through the light guide path.

[0009]

[Action]

 The light of the LED is transmitted to the panel through a light guide path that connects the shield plate and each hole of the panel, and is emitted from the window of the panel.

[0010]

【Example】

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an exploded perspective view of an essential part showing an embodiment of the display device of the present invention, and FIG. 2 is a sectional view of the essential part of FIG. In the figure, reference numeral 30 denotes a light guide substrate made of a light transmissive member, which is provided between the shield plate 23 and the panel 11 and has light guide paths 31 provided on both sides in a convex shape. Light guide path provided on the convex 31, the window 11 _first panel 11 and have adapted to be inserted into the hole 2 3 ₁ of the shielding plate 23 guides light of LED 22, the window 11 _first panel 11 Exit from.

FIG. 3 is an explanatory diagram illustrating a light transmission operation of the display device shown in FIG. In order for the light of the LED 22 to enter the light guide path 31 and to be efficiently emitted from the window of the panel 11 without leaking from the light guide substrate 30, ε must be 50 ° or more. For this purpose, the light guide substrate 30 satisfying the following conditions is required.

The refractive index n of the light guide substrate 30 is larger than 1, and the following relationship holds. n = sin α / sin β ... When α is 50 ° or more, the reflectance increases, and therefore the distance d ₁ on the LED 22 side of the light guide path 31 cannot be unnecessarily increased, and the distance from the LED 22 to the light guide path 31 is increased. It is determined by the relationship with the distance.

When the distance from the LED 22 to the light guide path 31 is L ₁ and the distance d ₁ of the light guide path 31 on the LED 22 side is 2 (x ₁ + x ₂ ), the following relationship holds. tan α = L ₁ / x ₁ ... Tan β = L _x / x ₂ ... L _x of the _equation is such that ε is 50 ° or more, that is, the reflectance is high, and ε = 90 ° − It is determined from the relationship of β.

Further, in order to prevent the light of the LED 22 from being emitted to the adjacent light guide path 31, the following conditions need to be satisfied. When the distance of the light guide path 31 on the side of the window 11 ₁ is d ₂ and the thickness of the light guide substrate 30 is t, d ₂ , d ₁ and t are determined so that the relationship of the following equation is established. {(D ₂ −d ₁ ) / t} ≧ tan β ... As described above, the relationship between L _x and the formula is maintained, so that the light of the LED 22 can be prevented from exiting from the adjacent window 11 _1. The light is emitted from the predetermined window 11 ₁ with a small loss.

[0015]

[Effect of the device]

 As described above in detail, in the display device of the present invention, the light guide path that connects the shield plate and each hole of the panel is integrally formed on the light guide substrate, and the light of the LED is displayed through the light guide path. It was designed to lead to. Therefore, the assembling workability is good, the high-density mounting is possible, and the display can be performed without reducing the illuminance of the LED.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an essential part showing an embodiment of a display device of the present invention.

FIG. 2 is a cross-sectional view of the main parts of FIG.

FIG. 3 is an explanatory diagram illustrating a light transmission operation of the display device shown in FIG.

FIG. 4 is a configuration diagram of a controller provided with a conventional display device.

FIG. 5 is an exploded configuration diagram of a main part of a conventional display device.

6 is a cross-sectional view of a main part of the display device shown in FIG.

FIG. 7 is a main-portion cross-sectional view showing another display device of a conventional example.

[Explanation of symbols]

 22 LED 23 Shielding plate 30 Light guide substrate 31 Light guide path 11 Panel

Claims (1)

[Scope of utility model registration request] 1. A display device for displaying an operation state of an electronic device by light emission of a plurality of light emitting elements arranged in a matrix, wherein a plurality of holes for emitting light of the light emitting element are provided at positions facing the light emitting element. A panel plate formed of an opaque member, and a shield plate formed of an opaque member, having a plurality of holes for accommodating the light emitting elements independently, and mounted on a printed circuit board on which the light emitting elements are mounted And a light guide substrate formed of a light transmissive member between the shield plate and the panel plate, and integrally formed with a light guide path that communicates the holes of the shield plate and the panel plate. The display device is provided so that mutual interference between the light emitting elements is eliminated and the light of each light emitting element is emitted through the light guide path.