JPH1063200A - Led dot matrix light emissive display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent scrolled characters, etc., from being viewed unnatural, to improve the display expressiveness, to increase the display contrast ratio and to improve the distinctness of the display, by forming the shape of respective light emitting dot parts long in a direction orthogonal to the scroll. SOLUTION: The respective light emitting dot parts are arranged in a matrix form at intervals of dot pitches P1, P2 by defining the dot pitch in a longitudinal direction as P1 and the dot pitch in a transverse direction as P2. These light emitting dot parts having an elliptic shape are formed to the length larger by >=2 times in the dot length (b) in the longitudinal direction that the dot width (a) in the transverse direction. The dot width (a) of the light emitting dot parts is so formed as to be made <=2/5 the dot pitch P2 in the transverse direction. If the dot width (a) is set <=2/5 the dot pitch P2 in such a manner, the numerical aperture attains max. 40% when the shape of the light emitting dot parts is formed into a rectangle and the dot length (b) is made coincident with the dot pitch P1, and actually, the numerical aperture becomes further smaller value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED dot matrix light emitting display in which a large number of light emitting dot portions of LEDs are arranged in a matrix and scroll display of characters and the like is performed.

[0002]

2. Description of the Related Art As shown in FIG. 9, a conventional LED dot matrix light emitting display has a light emitting dot section 2 in which a large number (8.times.8 dots in FIG. 9) are arranged in a matrix on a display surface 1a of a light emitting display 1. Was often circular in shape. In some cases, these light emitting dot portions 2 may be square or other polygons having substantially the same length and width.

As shown in FIG. 10, for example, a light emitting display 1 has a mask plate 4 on a wiring board 3 on which a number of LEDs ([Light Emitting Diode] light emitting diodes) 5 are arranged and wired.
Are joined. The mask plate 4 has many through holes 4
a are arranged in a matrix. Each through-hole 4a is a mortar-shaped tapered hole penetrating from the display surface 1a on the front surface to the back surface, and the inner peripheral surface is a light reflection surface. Each of the LEDs 5 is disposed on the wiring board 3 so as to be accommodated in the respective through holes 4a of the mask plate 4 bonded to the wiring board 3 by one or two or more (one in FIG. 10). Wired. Each of the through holes 4a is filled with a sealing material 8 made of translucent silicone rubber or the like so as to seal the LED 5 housed therein. Therefore, the light emitted by each LED 5 is directly reflected through the sealing material 8 or reflected on the inner peripheral surface of the through hole 4a, and is emitted to the outside from the entire opening of the through hole 4a. The opening 4a becomes the light emitting dot portion 2 of the light emitting display 1.

The light-emitting display 1 can be used alone or as shown in FIG.
As shown in FIG. 11, a plurality of light emitting displays 1 are arranged side by side (FIG. 11).
In this case, two characters are arranged vertically and a large number are arranged horizontally), and an arbitrary character, figure, symbol, or the like is displayed by turning on the LED 5 of the light emitting dot unit 2 by a controller (not shown). That is, for example, when the light emitting display 1 shown in FIG. 9 is used alone, one character such as 8 × 8 dot characters can be displayed, and in the case of a large number of light emitting displays 1 shown in FIG. Can display a plurality of 16 × 16 dot characters and the like side by side (L in FIGS. 9 and 11).
(The hatching is applied to the light emitting dot section 2 in which the ED 5 is turned on.)

Here, each light emitting dot portion 2 of the light emitting display 1
The larger the area (the size of the opening of the through hole 4a) is, the smaller the gap between the adjacent light emitting dot portions 2 becomes. Therefore, the arrangement of the light emitting dot portions 2 to be turned on can be easily recognized as a continuous line, and Expressiveness is improved. However, since the light emitting dot portion 2 emits the light emitted by the LED 5 from the entire surface of the opening of the through hole 4a, as long as the same LED 5 is used, if the area of the light emitting dot portion 2 becomes large, the brightness decreases, and
The display contrast ratio is reduced due to the reflection of the external light from the surroundings at the light emitting dot portions, and the display clarity deteriorates.
That is, when the area of the light emitting dot portion 2 is large, the display expression is improved but the display clarity is reduced. When the area is reduced, the display expression is reduced but the display clarity is improved. For this reason, generally, the surrounding brightness is 1000 to 2000.
In the indoor light-emitting display device 1 having a luminance of about lux and providing a certain level of display clarity even with low luminance, the dot aperture ratio (the total area of the light-emitting dot portions 2 is equal to the display surface 1a) in order to improve the display expression. Of the total area) is about 50%. On the other hand, in brighter outdoor applications, the display expression is sacrificed to some extent in order to secure sufficient display clarity, the dot aperture ratio is reduced to about 30%, the display contrast is increased, and the brightness is increased. I was

Further, in the case of the light emitting display 1 for displaying stationary characters and the like, the light emitting dot portion 2 with the LED 5 turned on is connected equally in both the vertical and horizontal directions so as to appear as a continuous line. In order to achieve this, it is necessary that the shape of each light emitting dot section 2 be a circle or a square having substantially the same vertical and horizontal widths as described above.

[0007]

However, even when the conventional light emitting display 1 is used for scrolling display contents such as characters, the shape of each light emitting dot portion 2 is almost equal in width and length. They were equal circles and squares. But,
When the display contents of characters and the like are scroll-displayed by such a light emitting display 1, there is a problem that the characters and the like appear to be spread in the scroll display direction due to a visual afterimage phenomenon, and the display becomes unnatural.

For example, if the shape of each light emitting dot portion 2 is circular and the dot aperture ratio is 30% or less, the ratio of the diameter of the light emitting dot portion 2 to the dot pitch becomes about 60% or less, and each adjacent light emitting dot portion 2 There is a gap between the light emitting dots so that one or more light emitting dot portions can be arranged. Therefore, as shown in FIG. 12, when the character "A" displayed on the light emitting display 1 is scrolled to the left by one dot (in FIG. 12, the light emitting dot portion 2 illuminated before scrolling is moved to the left). Light-emitting dot portions 2 which are indicated by downward hatching and are turned on after scrolling are indicated by right-downward hatching), and as shown in FIG. The light-emitting dot unit 20 appears as if it were lighted in a pseudo manner (in FIG. 13, the virtual light-emitting dot unit 20 that is lighted in a pseudo manner is indicated by cross-hatching). Therefore, when the light emitting display 1 performs scroll display, the lines constituting characters and the like appear thick in the scroll direction due to the pseudo lighting of the virtual light emitting dot portion 20, but in the direction orthogonal to the scroll. , Adjacent light emitting dot section 2
Since the original gap remains as it is, the font configuration of the character "A" is not uniform in the vertical and horizontal directions, and is felt unnatural.

In view of the above circumstances, the present invention can prevent characters and the like displayed by scrolling from appearing unnatural by forming the shape of each light emitting dot portion to be long in the direction perpendicular to the scroll. LED with good display expression and high display contrast ratio and high display clarity
It is an object to provide a dot matrix light emitting display.

[0010]

In order to solve the above-mentioned problems, a first aspect of the present invention is to arrange a large number of light emitting dot portions which emit light by LEDs on a display surface in a matrix. An LED dot matrix that displays an arbitrary character or the like by turning on the LED and sequentially switches the light emitting dot portion where the LED is turned on to a vertically or horizontally adjacent one and scrolls the display content of the character or the like. In the light emitting display, the dot width of each light emitting dot portion along the scroll direction is formed to be 2/5 or less of the dot pitch of each light emitting dot portion, and the dot length of each light emitting dot portion orthogonal to the scroll direction. Are formed at least twice the dot width.

According to the first aspect of the present invention, since the dot width of each light emitting dot portion is equal to or less than 2/5 of the dot pitch, each light emitting dot portion is arranged with a sufficient gap in the scroll direction, and scroll display is performed. In this case, the virtual light emitting dot portion can be surely illuminated pseudo between them. Further, since the dot length of each light-emitting dot portion is twice or more the dot width, the shape of each light-emitting dot portion is elongated in the direction orthogonal to the scroll. Therefore, in the LED dot matrix light emitting display, when a display content such as a character is scroll-displayed, the light emitting dot portion to be turned on appears to be spread in the scroll direction by pseudo lighting of the virtual light emitting dot portion. Since the shape of the portion itself is elongated in a direction orthogonal to the direction, it is recognized as a lighting display having a substantially uniform size in the vertical and horizontal directions, and it is possible to prevent display characters and the like from appearing unnatural.

In addition, the virtual light emitting dot portion is simulated in the scroll direction, and the actual gap between the light emitting dot portions is narrowed in the direction perpendicular to the scroll. And the display expression is improved. Since the dot width of each light emitting dot portion is not more than 2/5 (1 / 2.5) of the dot pitch, the dot aperture ratio is sufficiently lower than 40%, so that the display contrast is improved and The display clarity can be improved by increasing the brightness of each light emitting dot portion without impairing the display expression.

The minimum value of the ratio of the dot width to the dot pitch is naturally larger than 0, and is actually larger than the LED element size. The ratio of the dot width to the dot pitch is preferably about 2/7 (1 / 3.5) to 1/6. The dot length is naturally smaller than the dot pitch of each light emitting dot portion, and is preferably about 2.5 to 4 times the dot width.

Further, the invention of claim 2 is characterized in that each of the light emitting dot portions is divided into a plurality of areas which emit light by different LEDs.

According to the second aspect of the present invention, each light emitting dot portion is not a single region formed by a single through hole, but a region formed by a plurality of through holes. When a plurality of LEDs are used in each light emitting dot portion, for example, it is possible to provide a through hole with high reflection efficiency for each LED. Further, even when a plurality of LEDs having different emission colors are used for each emission dot portion, a through hole or the like can be provided for each LED of each emission color.

The invention according to a third aspect is characterized in that a dot aperture ratio, which is a ratio of a total area of the plurality of light emitting dot portions to a total area of the display surface, is 20% or less.

According to the third aspect of the present invention, by setting the dot aperture ratio to 20% or less, a sufficiently high display contrast ratio can be obtained, and the brightness of each light emitting dot portion is also increased, thereby further improving the display clarity. Can be done. Moreover, even if the dot aperture ratio is reduced in this manner, sufficient display expression can be obtained by the elongated shape of each light emitting dot portion and the pseudo lighting of the virtual light emitting dot portion.

The minimum value of the dot aperture ratio is naturally 0
%, And the minimum value is actually determined by the element size of the LED. It is preferable that the dot aperture ratio is about 10 to 3%.

[0019]

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

FIGS. 1 to 8 show an embodiment of the present invention. FIG. 1 is a perspective view of an LED dot matrix light emitting display, FIG. 2 is a perspective view of a display device for horizontal scrolling, and FIG. FIG. 4 is a perspective view of a display device for vertical scrolling, FIG. 4 is a partial plan view showing an arrangement of light emitting dot portions, FIG. 5 is a plan view showing a lighting state of a light emitting display for performing scroll display, and FIG.
FIG. 7 is a partial plan view showing the arrangement of the light emitting dot portions composed of two circular regions, FIG. 7 is a partial plan view showing the arrangement of the light emitting dot portions composed of two octagonal regions, and FIG. FIG. 9 is a partial plan view showing the arrangement of light emitting dot portions each composed of four octagonal regions that emit light. Components having the same functions as those of the conventional example shown in FIGS. 9 to 13 are denoted by the same reference numerals.

As shown in FIG. 1, the LED dot matrix light emitting display of the present embodiment has a display surface 1 of the light emitting display 1.
A description will be given of a case in which the light emitting dot portions 2 are arranged in a matrix in an 8 × 8 dot arrangement. However, the configuration of the number of dots of the light emitting dot unit 2 in the present invention is arbitrary. Also,
This light emitting display 1 has a structure in which a mask plate 4 is bonded on a wiring board 3 as in the case shown in FIG. 10, but is not necessarily limited to such a structure.
A structure in which an LED lamp is provided on a wiring board may be used.

In the light emitting display 1 of the present embodiment, the shape of each light emitting dot portion 2 is an oval that is long in the vertical direction. That is, the shape of the opening of each through hole 4a in the mask plate 4 shown in FIG. Only one LED 5 may be arranged and wired near the center of each through hole 4a, but two or more LEDs 5 may be arranged and wired along the longitudinal direction of the oval.

The light-emitting display 1 displays an arbitrary character, figure, symbol, or the like by turning on the appropriate light-emitting dot section 2 under the control of the controller 6, and simultaneously turns on the light-emitting dot section 2 by one dot. The direction can be switched to scroll display characters and the like (in FIG. 1, the light emitting dot unit 2 with the LED 5 turned on).
Hatching). Therefore, the light emitting display 1 is rarely used alone, and a large number of the light emitting displays 1 are used side by side. Further, a plurality of display dots may be arranged in the vertical direction to increase the number of display dots.

FIG. 2 shows an example of a display device in which a plurality of light emitting displays 1 are combined to display a Japanese sentence horizontally. In this display device, a plurality of light emitting displays 1 are arranged side by side on a front surface of a housing 7, and a controller 6 (not shown in FIG. 2) is stored in the housing 7. Then, for example, the dots forming each character of "Today's weather is ..." are scroll-displayed in order from the right end, so that this character string is displayed so as to flow to the left.
Further, as shown in FIG. 3, the display device can display a Japanese sentence vertically in a scrolling manner.
However, in this case, the shape of each light emitting dot portion 2 of the light emitting display 1 is an oval that is long in the horizontal direction.

As shown in FIG. 4, each of the light emitting dot units 2 has a vertical dot pitch (arrangement interval) of P1, a horizontal dot pitch of P2, and a matrix of the dot pitches P1, P2. It is arranged in a shape. The dot pitch P1 and the dot pitch P2 are usually the same length, but may be different depending on the case. And
Each of the oval light emitting dot portions 2 has a dot length b in the vertical direction more than twice as long as the dot width a in the horizontal direction, and preferably about 2.5 to 4 times. It is formed.
Further, the dot width a of the light emitting dot portion 2 is not more than 2/5 (1 / 2.5) of the horizontal dot pitch P2, and preferably about 2/7 (1 / 3.5) to about 1/6. It is formed so that it becomes. Thus, the dot width a is set to 2 of the dot pitch P2.
When / 5 or less, the aperture ratio becomes 40% of the maximum when the shape of the light emitting dot portion 2 is rectangular (the area is a × b) and the dot length b is equal to the dot pitch P1.
Actually, the value becomes smaller. The opening ratio is preferably set to 20% or less. For example, when the dot pitches P1 and P2 are P1 = P2 = 20 mm, a = 5 mm (= P22) b = 12.5 mm (= 2.5a) and the aperture ratio is set to about 14%. a = 3 mm (= approximately P2 / 1 / 6.6) b = 9 mm (= 3a) and the aperture ratio is approximately 6%, and when P1 = P2 = 15 mm, a = 3 mm (= P2 · 1/5) b = 9 mm (= 3a) and the aperture ratio can be set to about 11%.

When the character "A" is scroll-displayed on the light emitting display 1 having the above structure, as shown in FIG. 5, a virtual image is formed between the adjacent light emitting dot portions 2 whose lighting is switched by the visual afterimage phenomenon. Since the light-emitting dot portion 20 looks as if it were simulatedly lit (in FIG. 5, the light-emitting dot portion 2 that is actually lit is shown by hatching falling to the right, and the virtual light-emitting dot portion 20 that is simulated is lit by cross hatching. Shown), the illuminated light-emitting dot portion 2 is felt to spread horizontally. However, since the light-emitting dot portions 2 that are actually turned on have a long oval shape in the vertical direction, each light-emitting dot portion 2 is recognized as a light-on display having a substantially uniform size in the vertical and horizontal directions. Character display can be prevented from appearing unnatural.

Each of the light emitting dot portions 2 to be lit is seen to be spread in the horizontal direction due to the pseudo lighting of the virtual light emitting dot portion 20, and is formed in an oblong shape in the vertical direction with a gap between the adjacent light emitting dot portions 2. , The connection of the light-emitting dot portions to be lit is good in both the vertical and horizontal directions, and the display expression is improved (that is, the dot aperture ratio is artificially increased). In addition, since the actual dot aperture ratio can be made sufficiently smaller than 40% (preferably 20% or less) without impairing the display expression, a high display contrast ratio can be obtained and the brightness of each light emitting dot portion 2 can be improved. Thus, the display clarity can be further improved.

In the above embodiment, the shape of each light emitting dot portion 2 is an ellipse. However, the light emitting dot portion 2 may be an elliptical shape, a rectangular shape, or other polygonal shape which is long in the vertical direction (horizontal direction in the case of vertical scrolling). Similar effects can be obtained.

Further, in addition to each light emitting dot portion 2 being a single region surrounded by an appropriate shape as in the above-described embodiment, it may be constituted by a plurality of divided regions. For example, as shown in FIG. 6, each light emitting dot portion 2 may be constituted by two circular regions 2a, 2a arranged in the vertical direction. Since the dot length b of the light emitting dot portion 2 is at least twice the dot width a which is the diameter of each region 2a, these regions 2a, 2a are arranged in contact with each other or with a certain gap. Thus, the light emitting dot unit 2 is divided into the area 2a,
2a, the mask plate 4 shown in FIG.
A through hole 4a having a circular opening is provided for each region 2a, and one or two or more LEDs 5 are accommodated therein. However, the controller 6 determines the L of these two areas 2a, 2a except when performing special display processing.
The same lighting control is performed for ED5.

Further, each of the light emitting dot portions 2 may be constituted by two octagonal regions 2b, 2b arranged in the vertical direction, for example, as shown in FIG. Each of these octagonal regions 2b, 2b has a shape in which four corners of a rectangle that is long in the vertical direction are chamfered. When each area 2b has a substantially rectangular shape as described above, the area of each light emitting dot section 2 becomes substantially a × b. Therefore, if the dot opening ratio is the same, the dot width a is narrower than in the case of FIG. be able to.

Further, each of the light emitting dot sections 2 has four octagonal regions 2 arranged vertically and horizontally as shown in FIG.
c ... can also be comprised. Each of these octagonal regions 2c is formed by chamfering four corners of a rectangle that is long in the vertical direction. In each of the light emitting dot sections 2, red light emitting LEDs 5 are used for the two areas 2c, 2c arranged at the upper right and lower left, and green light emitting is used for the two areas 2c, 2c arranged at the upper left and lower right. LED5 is used. That is,
In the mask plate 4 shown in FIG. 10, LEDs 5 of respective emission colors are accommodated in through holes 4a provided for each region 2c. In this case, the controller 6 has four areas 2c.
By turning on all the LEDs 5, not only the light emitting dot portion 2 is turned on in orange (red + green), but also two areas 2c, 2c of one of the light emitting colors.
By turning on only the LED 5, the light emitting dot portion 2 can be turned on in red or green.

[0032]

As is apparent from the above description, according to the LED dot matrix light emitting display of the present invention, each light emitting dot portion appears to be spread in the scroll display direction by pseudo lighting of the virtual light emitting dot portion. Since the shape itself is elongated in the direction orthogonal to the scroll display, it is recognized as a lighting display having a substantially uniform size in the vertical and horizontal directions, and it is possible to prevent display characters and the like from appearing unnatural. Become like That is, sufficient display expression can be ensured by the pseudo lighting of the light emitting dot portion and the elongated shape. In addition, since the dot aperture ratio can be reduced, the display contrast ratio is increased, and the luminance of each light emitting dot portion is also increased, so that the display clarity can be further improved.

[Brief description of the drawings]

FIG. 1 illustrates one embodiment of the present invention, wherein LE is
It is a perspective view of a D dot matrix light emitting display.

FIG. 2 illustrates one embodiment of the present invention, and is a perspective view of a display device for horizontal scrolling.

FIG. 3, showing one embodiment of the present invention, is a perspective view of a display device for vertical scrolling.

FIG. 4 illustrates one embodiment of the present invention, and is a partial plan view illustrating an arrangement of light emitting dot units.

FIG. 5, showing an embodiment of the present invention, is a plan view illustrating a lighting state of a light emitting display for performing scroll display.

FIG. 6 illustrates one embodiment of the present invention, and is a partial plan view illustrating an arrangement of a light emitting dot portion including two circular regions.

FIG. 7 illustrates one embodiment of the present invention, and is a partial plan view illustrating an arrangement of a light emitting dot portion including two octagonal regions.

FIG. 8, showing an embodiment of the present invention, is a partial plan view showing an arrangement of light-emitting dot portions composed of four octagonal regions that emit red and green light.

FIG. 9 shows a conventional example, and is a perspective view of a light emitting display.

FIG. 10 shows a conventional example and is a partial longitudinal sectional view showing a structure of a light emitting display.

FIG. 11 shows a conventional example, and is a partial perspective view when a large number of light emitting displays are combined.

FIG. 12 is a plan view showing a conventional example and showing an actual lighting state of a light emitting display for performing scroll display.

FIG. 13 is a plan view showing a conventional example and showing an apparent lighting state of a light emitting display for performing scroll display.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 light emitting display 1 a display surface 2 light emitting dot portion 2 a region 2 b region 2 c region 20 virtual light emitting dot portion 5 LED 6 controller

Claims (3)

[Claims] 1. A large number of light emitting dot portions which emit light by LEDs are arranged in a matrix on a display surface. By turning on the LEDs of the light emitting dot portions, arbitrary characters and the like are displayed, and the LEDs are turned on. In an LED dot matrix light emitting display that sequentially switches the light emitting dot portions to vertically or horizontally adjacent ones and scrolls display contents such as characters, the dot width of each light emitting dot portion along the scroll direction is: An LED dot which is formed at a dot pitch of not more than 2/5 of a dot pitch of each light emitting dot portion and a dot length orthogonal to a scroll direction in each light emitting dot portion is formed at least twice a dot width. Matrix light emitting display. 2. Each of the light emitting dot portions has a different L.
2. The LED dot matrix light emitting display according to claim 1, wherein the LED dot matrix light emitting display is divided into a plurality of areas that emit light by ED. 3. A dot aperture ratio, which is a ratio of the total area of the plurality of light emitting dot portions to the total area of the display surface, is 20%
The LED dot matrix light emitting display according to claim 1 or 2, wherein: