JPH11296108A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve uniformity on a screen and to provide excellent visibility by deviating the maximum emitted light intensity direction of a light emitting element from a direction perpendicular with a mounting surface. SOLUTION: By attaching a light emitting element inclination regulating component 8 by fitting each LED 6 into a long hole 12 on the light emitting element inclination regulating component 8, the light emitting element inclination regulating component 8 is arranged while deviating the LED 6 downward with respect to a light emitting element attaching substrate 7 in the state of covering each LED 6. Thus, a maximum emitted light intensity direction 9 of each LED 6 is directed downward by an angle θ with respect to a perpendicular L. This perpendicular L is the one to the light emitting element inclination regulating component 8 and the light emitting element attaching substrate 7 and it is preferable for the inclination between the maximum emitting light intensity direction 9 and the perpendicular L to be angle θ of from 2 to 45 deg. in down ward direction. When this angle θ is smaller than 2 deg., it is not preferable since a difference from conventional 0 deg. is a little and when this angle is larger than 45 deg., it is not preferable since the neck or the like is tired at the time of locking up the display for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device using a display element such as a light emitting diode.

[0002]

2. Description of the Related Art For example, as a large screen type display device,
A light emitting diode element (hereinafter, referred to as LED (Light Em)
A display device for displaying an image using a light emitting element (referred to as "itching diode") has been developed. FIG.
Is L attached to the mounting surface of the display panel of the display device.
ED is shown. As shown in FIG. 5, LEDs indicated by ○ are arranged on the mounting surface 21 of the display unit 20 by, for example, a horizontal in-line arrangement. These LEDs correspond to the respective colors of R (red), G (green), and B (blue), as shown in the circles, and three LEDs of each color of RGB form a set. The pixel 22 is constituted. When a display screen of a display device is formed by the display unit 20, a plurality of display units 20 are combined so that the number of pixels corresponds to the resolution of the display device.

By the way, such a display unit 20
Recently, is used for, for example, a large-screen display device for outdoor advertisement such as a wall surface of a building. However, for example, CRT
The viewing angle is narrower than that of a display device using a (Cathode Ray Tube) or a discharge tube, and a wider viewing angle is desired for further market expansion. Therefore,
For example, as shown in the schematic diagrams of FIGS. 6A, 6B, and 6C, by setting the mounting angle of the display device and the mounting angle of the LED forming the pixel downward, the viewing angle is lowered. To ensure that.

[0006] In the conventional example shown in FIG.
The display surface faces downward by attaching the upper end portion of the “0” so as to protrude forward from the lower end portion.
However, if the lower end portion of the display device 30 is located at the position of the wall surface W, the overhanging upper end portion may protrude out of the site of the building, which is not preferable in terms of aesthetics and safety. In addition, as shown in FIG.
And the upper end of the display device 30 is
If it is mounted so that it does not protrude, the lower end portion is disposed in the recess WH, so that the image at the lower portion of the display surface is blocked. Further, the LED is mounted at a predetermined angle with respect to the mounting surface 21 so that the display device 3
Although it is conceivable to attach 0 vertically along the wall surface W, for example, the angle is limited to about 10 degrees due to a problem such as an attachment structure to the substrate (the structure of the substrate itself, the shape of the terminal of the element). Also, when the angle is increased, the pixel pitch in the vertical direction is reduced, and there is a problem that a displayed image looks unnatural.

Therefore, as shown in FIG. 6C, the display device 31 is vertically mounted along the wall surface W,
Display units 32a, 3 having inclined ED mounting surfaces
It is known to use 2b, 32c, 32d, 32e. Note that the display units 32 are actually arranged by the number corresponding to the resolution of the display device.

FIG. 7 is a partial front view showing an example of mounting LEDs of the display units 32a and 32b shown in FIG. 6C. FIG. 8 is a side view of the units 32a and 32b shown in FIG. FIG. The other display units 32c to 32e (not shown) have the same configuration.

As shown in FIG. 7, LEDs 34R, 34G, 34B corresponding to RGB colors are mounted on the mounting surfaces 33a, 33b of the display unit 32a and the mounting surfaces 33c, 33d of the display unit 32b, for example, by a delta arrangement method. The pixel 34 is formed by, for example, five LEDs. The eaves member 3 is located above each pixel 34.
5a, 35b, 35c, and 35d are formed to block external light incident on the LED to improve contrast. That is, each eave member 35a, 35 is provided for each horizontal line.
b, 35c and 35d are formed.

When the display units 32a and 32b are viewed from the side, as shown in FIG.
The mounting surfaces 33a and 33b and the mounting surfaces 33c and 33d are formed to be inclined downward at a predetermined angle, and the LEDs 34R, 34G and 34B constituting the pixel 34 are mounted facing downward. Further, the eave members 35a, 35b, 35c, 35
d is also disposed at an adjacent position above the LED 34R, 34G, 34B at the same angle as the arrangement angle of the LED 34R, 34G, 34B.
ED34R, 34G, and 34B) are shielded from external light to improve contrast.

[0009]

However, by providing the mounting surface of each display unit 32 with an inclination, a step is generated for each display unit 32, and the LEDs 34R, 3
The angles at which the light beams emitted from the 4G and 34B are blocked by the eaves member 35 differ.

For example, as shown as an example, the light beam emitted from the LED 34G1 in the display unit 32a is blocked by the lower eave portion 35 at an angle of, for example, 36.2 degrees downward from the horizontal line. LED34
The light beam emitted from G2 goes downward from the horizontal line,
For example, it is blocked by the lower eaves 35 at an angle of 31.4 degrees. As a result, a large luminance difference actually occurs for each pixel, and when an image is viewed from a position at a certain angle or more, for example, the entire image is displayed as a horizontal color stripe screen.

Therefore, the present invention solves the above-mentioned problems, and can obtain a sufficient viewing angle in the downward direction even when the screen is installed vertically without tilting downward, and the mounting surface of the light emitting element is constituted by a flat surface. Therefore, it is an object of the present invention to provide a display device with good screen uniformity and excellent visibility.

[0012]

According to the present invention, there is provided a display device in which a plurality of light emitting elements are arranged in a dot pattern on a flat mounting surface to display an image. By a display device characterized in that the maximum emission intensity direction of the light emitting element is shifted from a direction perpendicular to the mounting surface,
Achieved.

According to the present invention, in a display device in which a plurality of light emitting elements are arranged in a dot pattern on a flat mounting surface to display an image, the maximum light emission intensity direction of the light emitting element is perpendicular to the mounting surface. From the direction. Assuming that the shift is downward, even when the screen of the display device is installed without tilting downward, it can be seen brightest from below, which is often seen, and a sufficient viewing angle can be obtained.

In the present invention, preferably, the horizontal and vertical pixel pitches are substantially the same when viewed from the direction of the maximum light emission intensity of the light emitting element. This makes it possible to make the display image on the display device look substantially uniform.

In the present invention, the inclination between the direction of the maximum light emission intensity of the light emitting element and the perpendicular to the mounting surface is preferably from 2 degrees to 45 degrees downward. If the inclination is smaller than 2 degrees, the difference from the conventional 0 degree is small, which is not preferable. On the other hand, if the inclination is larger than 45 degrees, the neck and the like become tired when looking up the display for a long time, which is not preferable.

In the present invention, preferably, the light emitting element has a plurality of energizing leads, the direction of maximum emission intensity coincides with the longitudinal direction of the leads, and the energizing leads are inserted vertically into the lead holes of the light emitting element mounting board. By covering a plurality of light emitting elements with a light emitting element inclination regulating component having an elongated hole larger than the size of the light emitting element, the direction of maximum light emission intensity of the light emitting element is shifted from a direction perpendicular to the mounting surface. This allows
Although the light emitting element has a simple structure, the light emitting element is held at a constant inclination, and the direction of the maximum light emission intensity of the light emitting element can be shifted from a direction perpendicular to the mounting surface.

In the present invention, preferably, an abutting portion is provided between the light emitting element mounting board and the light emitting element inclination regulating component. This makes it possible to properly secure a space between the light emitting element mounting board and the light emitting element inclination regulating component, and to make the inclination of the light emitting element a constant value.

In the present invention, preferably, the light emitting element inclination regulating component and the abutting portion are made of a material having good thermal conductivity, so that even if the light emitting element generates heat, the amount of heat is reduced by the light emitting element inclination regulating component and the abutting portion. The heat can be radiated to the outside via.

[0019]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 is a perspective view showing a preferred embodiment of a display device (display) according to the present invention. In FIG. 1, a display device 1 includes a housing 2 in which a light emitting element mounting board for mounting a light emitting diode (LED), which will be described later, and various display controls are provided. Control board and the like are arranged. The front surface of the housing 2 is configured as a vertical flat mounting portion 3. The housing 2 is provided with a plurality of eaves members 4 at predetermined intervals in the horizontal direction. Although the eaves member 4 in FIG. 1 is a plate-shaped member that is continuous in the horizontal direction, the present invention is not limited to this, and may be provided intermittently corresponding to the position of each pixel described later. The upper surface of the eaves member 4 is an eaves surface 4a, which can block external light such as the sun.

FIG. 2 is a diagram showing a state where the display device 1 of FIG. 1 is cut along the line AA. As shown in FIG.
The display device 1 is fixed to a vertical wall surface W of a building or the like, for example, and has LEDs 6 as a plurality of light emitting elements. A light emitting element mounting board 7 and a light emitting element tilt regulating component 8 are provided inside the housing 2 of the display device 1. LE
D6 is an LE that emits red (R) light as shown in FIG.
D6A, an LED 6B that emits blue (B) light, and an LED 6C that emits green light (G). The set of LEDs 6A, 6B, 6C is arranged in a horizontal inline manner. Each set of LEDs 6A, 6B, 6C constitutes a pixel. The vertical interval d and the horizontal interval d1 of each set of LEDs 6 are set to be substantially the same when viewed from the maximum emission intensity direction 9. The LEDs 6 are arranged in a dot pattern with respect to the light emitting element inclination regulating component 8 to display a color image. The light emitting element inclination regulating component 8 and the light emitting element mounting board 7 each constitute a planar mounting surface.

In the display device 1 shown in FIG. 2, a plurality of eaves members 4 are fixed to the housing 2. These eaves members 4
In FIG. 2, the LEDs 6 are arranged corresponding to one row of LEDs 6 in the horizontal direction. The eaves member 4 is substantially parallel to the maximum emission intensity direction (axial direction) 9 of the LED 6, and as described above, the external light 10 such as sunlight is blocked by the eaves member 4 so that the external light 10 The LED 6 does not reach the corresponding LED 6. As shown in FIGS. 2 and 3, the display device 1 is configured by combining a plurality of display units 1A, and secures a necessary display device area.

Next, as shown in FIG. 4, the LED 6, which is a light emitting element, has a light emitting portion 6F and a bar-shaped conducting lead 6H. The axial direction of the energizing lead 6H coincides with the maximum light emission intensity direction 9 of the light from the light emitting portion 6F.

Next, the light emitting element mounting board 7 will be described with reference to FIGS. Light emitting mounting board 7
Is designed to insert and attach a rod-shaped energizing lead 6H of the LED 6. For this purpose, the light emitting element mounting board 7 has a plurality of holes 7A. The light emitting element mounting board 7 is fixed vertically between the outer frame 2A and the middle frame 2B of the housing 2. The light emitting element mounting board 7
The rod-shaped energizing lead 6H of the LED 6 is electrically connected to a predetermined circuit pattern so that the light emitting section 6F emits light.

On the other hand, as shown in FIGS. 2 and 4, the light emitting element inclination restricting component 8 shown in FIGS. 2 and 4 is parallel to the light emitting mounting board 7 and has an outer frame 2A and a middle frame 2B. Mounted vertically between. The light emitting element inclination regulating component 8 has an abutting portion 11. This butting part 1
Numeral 1 regulates the distance between the light emitting element mounting board 7 and the light emitting element inclination restricting component 8, and is adapted to abut against the light emitting element mounting board 7. The light emitting element tilt regulating component 8 and the abutting portion 11 can be preferably made of, for example, aluminum, copper, iron, or the like having good thermal conductivity. By doing so, even when each LED 6 generates heat, the heat can be efficiently radiated to the outside via the abutting portion 11 and the light emitting element inclination regulating component 8.

The light emitting element inclination regulating component 8 has an elongated hole 12 for regulating the inclination of the LED 6. This long hole 1
2 is, for example, three LEDs 6A, 6B, 6 of a set of pixels.
It is a long hole large enough to fit C individually.
The long hole 12 is formed to be slightly larger in the vertical direction than the size of the light emitting portion 6F, and is a hole for restricting and holding each LED 6 by being inclined obliquely downward from the perpendicular L as shown in FIG. Each LED 6 is fitted in the elongated hole 12, and the energizing lead 6H of each LED 6 is fitted in the hole 7A of the light emitting element mounting board 7. That is, the conducting lead 6H
Are inserted vertically or substantially perpendicularly into the hole 7A of the light emitting element mounting board 7.

In other words, the light emitting element inclination restricting parts 8 are attached so that the respective LEDs 6 are fitted into the elongated holes 12 of the light emitting element inclination restricting parts 8, so that the light emitting element inclination restricting parts 8 are covered with the respective LEDs 6. By disposing the LEDs 6 so as to be shifted downward with respect to the light emitting element mounting board 7, the maximum emission intensity direction 9
Is directed downward by an angle θ with respect to the perpendicular L shown in FIG. The perpendicular L is a perpendicular to the light emitting element inclination regulating component 8 and the light emitting element mounting board 7, and the inclination between the maximum emission intensity direction 9 and the perpendicular L is such that the angle θ is 2 degrees to 4 degrees in the downward direction.
Preferably, it is 5 degrees. If the angle θ is smaller than 2 degrees, it is not preferable because the difference from the conventional 0 degree is small, and if it is larger than 45 degrees, the neck and the like become tired when looking up the display for a long time, which is not preferable. The angle θ is, for example, preferably about 15 degrees, and the inclination of about 15 degrees is the optimum viewing angle of the display image of the display device 1 at the average installation position, but is limited to this angle. Not something.

As shown in FIG. 2, the rear side of the housing 2 is mounted on a vertical wall surface W. As shown in FIG. 2, external light 10 such as sunlight is blocked by the eaves member 4,
Is, for example, 25 degrees so as not to reach the light emitting portion 6F of the LED 6. An eaves member 4 is provided above each LED 6, but in the embodiment of the present invention, the eaves member 4 has, for example, an inclination of about 15 degrees downward from a perpendicular (horizontal line) L. It is arranged. The eaves member 4 is located below and adjacent to the L
Above the vertical line (horizontal line) L from the position of the ED 6;
For example, an extension of a line forming an angle of 4 degrees becomes an intersection, and the line extends downward from a perpendicular line L from the LED 6 disposed adjacent to the tip of the eaves surface 4A and above the eaves surface 4A, for example, by about 45 degrees.
It is desirable that the shape of the eaves member 4 be set so that the intersection of the extension of the degree line is the intersection. That is, it is desirable to set the thickness and length of the eaves member 4 so as to satisfy such a condition.

Further, the light emitting element inclination regulating component 8 shown in FIG.
It is desirable that the vertical width S of the long hole 12 be larger than the diameter of the light emitting portion 6A of the light emitting portion 6 of the LED 6 only by a predetermined dimension, and for example, three protruding abutting portions 11 are provided. . The abutting portion 11 may be provided in advance on the light emitting element mounting board 7 side. The presence of the abutting portion 11 allows the distance between the light emitting element mounting board 7 and the light emitting element tilt regulating component 8 to be set correctly,
The maximum emission intensity direction 9 of the ED 6 can be directed to a correct angle.

Next, with reference to FIGS. 2 and 4, the manner in which the LED 6 is mounted using the light-emitting element mounting board 7 and the light-emitting element tilt regulating component 8 will be briefly described. LED
6 is provided with a hole 7
A, and the conducting lead 6H is securely connected electrically to the circuit pattern of the light emitting element mounting board 7, for example, by soldering. In this state, the light emitting element inclination restricting component 8 is fitted into the housing 2. In this case, each LED 6 is fitted over the elongated hole 12 so as to cover the light emitting element inclination restricting component 8, and The straight portion of the inner peripheral surface contacts the straight portion of the rear portion 6A. Thereby, each L
As shown in FIG.
From a predetermined angle downward. That is, the maximum light emission intensity direction 9 of the light emitting unit 6F is directed downward at an angle of θ with respect to the perpendicular L as shown in FIG. The maximum emission intensity direction 9 refers to a direction in which the maximum emission intensity direction of the light emitted from the light emitting unit 6F of the LED 6 occurs.

As described above, by arranging each LED 6 and the eaves member 4 at a predetermined angle, the direction of the LED 6 can be a direction below the perpendicular L and an optimum viewing (maximum luminance) direction. For this reason, the set of LEDs 6 for each horizontal row can prevent a difference in viewing angle and contrast from being caused by the influence of the eaves member 4.

It should be noted that the shapes, arrangements, or set angles of the respective elements in the illustrated embodiment are merely examples, and the angles, lengths, and LEDs may be changed according to the display device (display unit) to which the present invention is applied.
Can be changed.

Further, the present invention is not limited to the above-described embodiment, and the LEDs may be arranged not in a horizontal in-line arrangement but in a delta arrangement or another arrangement, for example. The light emitting element is not limited to the LED, and it is a matter of course that another kind of light emitting element can be adopted.

By arranging the light emitting element and the eaves member at a predetermined angle, a sufficient viewing angle can be obtained even when the screen is set vertically without tilting downward. Since the light-emitting portion of the LED is formed of a flat surface, a display device with good screen uniformity can be realized. In FIG. 3, since the vertical pixel pitch (interval) d is wider than the horizontal pixel pitch d1, a natural image is obtained even when each LED is inclined or viewed from below. That is, the pixel pitch in the horizontal direction and the pixel pitch in the vertical direction are made substantially the same as viewed from the maximum light emission intensity direction 9 of the light emitting element in FIG. In addition, since the inclination of the light emitting element is controlled by the component, the LED linear portion can be used as a reference, and the accuracy of maintaining the inclination of the LED can be improved. A material having good heat conductivity, such as aluminum, can be used for the light emitting element inclination regulating component, and heat radiation is improved, so that reliability is improved. In addition, the amount of expensive silicone resin for sealing can be reduced and the cost can be reduced. With parts that have a slot for regulating the board surface and tilting,
It is preferable that the LED is inclined downward with respect to the substrate surface so that the pixel pitch viewed from the direction of the maximum luminance is substantially the same in the horizontal and vertical directions.

In the embodiment of the present invention, a so-called bullet-shaped LED having a plurality of rod-shaped conducting leads and having the direction of the maximum light emission intensity and the longitudinal direction of the leads coincide with each other is inserted vertically into the lead hole of the mounting board. An LED tilt regulating component having an elongated hole whose tilting direction is larger than that of the light emitting element is put on a plurality of LEDs, and is shifted in parallel to the substrate at a constant interval by using an abutting portion so as to have a constant tilt. Has formed. Preferably, the horizontal width HW of each LED 6 shown in FIG. 3 is larger than the vertical width VW, and is, for example, substantially elliptical. As a result, the viewing angle is wide in the horizontal direction and narrow in the vertical direction, which is the required viewing angle.

[0036]

As described above, according to the present invention,
In a display device in which a plurality of light emitting elements are arranged in a dot shape on a planar mounting surface to perform image display,
A display device can be realized in which the direction of the maximum light emission intensity of the light emitting element is shifted from a direction perpendicular to the mounting surface.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a preferred embodiment of a display device of the present invention.

FIG. 2 is a cross-sectional view of the display device of FIG. 1 taken along line AA.

FIG. 3 is a diagram showing an example in which the LED arrangement in the display device of FIG. 2 is a horizontal in-line system.

FIG. 4 is an enlarged perspective view showing a part of an arrangement portion of the LEDs in FIG. 2;

FIG. 5 illustrates an example of a conventional display device.

FIG. 6 is a diagram showing a mounting example of a conventional display device.

FIG. 7 is a diagram showing another example of a conventional display device.

FIG. 8 is a diagram showing another configuration example of a conventional display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 2 ... Housing, 4 ... Eaves member, 6
... LED (Light Emitting Element), 7 ... Light Emitting Element Mounting Board, 8 ... Light Emitting Element Inclination Control Part, 6F ... Light Emitting Part, 6H ... Electrification Lead, 9 ... Maximum Light Emission of LED Strength direction.

Claims (6)

[Claims] 1. A display device in which a plurality of light emitting elements are arranged in a dot pattern on a flat mounting surface to display an image, wherein a maximum light emission intensity direction of the light emitting elements is set to a direction perpendicular to the mounting surface. A display device characterized by being displaced. 2. A light-emitting element viewed from a maximum light-emission intensity direction.
2. The horizontal and vertical pixel pitches are substantially the same.
The display device according to claim 1. 3. The display device according to claim 1, wherein the inclination between the maximum luminous intensity direction of the light emitting element and a perpendicular to the mounting surface is set between 2 degrees and 45 degrees in a downward direction. 4. The light emitting element has a plurality of energizing leads, the direction of maximum light emission intensity coincides with the longitudinal direction of the lead, and the energizing lead is inserted vertically into the lead hole of the light emitting element mounting board. The display device according to claim 1, wherein a maximum emission intensity direction of the light-emitting element is shifted from a direction perpendicular to the mounting surface by covering a plurality of light-emitting elements with a light-emitting element inclination regulating component having an elongated hole larger than the size. 5. The display device according to claim 4, wherein an abutting portion is provided between the light emitting element mounting board and the light emitting element inclination regulating component. 6. The display device according to claim 4, wherein the light emitting element tilt regulating component and the abutting portion are made of a material having a high thermal conductivity.