JPH113051A - Led display and display device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a LED display and a display device in which outward appearance is good at the time of non-lighting and color deviation is less by making picture elements constituting a pixel in a block different one another in arrangement and arranging the block repeatedly. SOLUTION: Semiconductor light emitting elements which can emit R, G, B respectively are arranged in each light emitting diode. One more R is arranged in addition to light emitting diode which can emit R, G, B, then four elements constitutes one diode. One pixel of a LED display performs display using this four elements. In this case, color deviation is suppressed by arranging a block periodically and repeatedly changing arrangement of light emitting diodes of RGB constituting one pixel in a block. That is, as shown by a dot line 302, ore more R is added to a light emitting diode of RGB and four elements constitutes one pixel. Also, as shown by a chain line 301, one block is formed by using three pixels vertically and horizontally. A LED display is constituted by arranging blocks repeatedly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED display used for a destination display panel, an LED display, and the like capable of displaying characters, symbols, and the like. The present invention relates to an LED display capable of multi-color or full-color display and a display device using the same.

[0002]

2. Description of the Related Art Today, light-emitting diodes (hereinafter also referred to as LED lamps) are semiconductor light-emitting elements capable of emitting light of three primary colors, RGB (red, green, and blue) with ultra-high brightness of 1000 mcd or more. A display device utilizing the technology has been developed. Such an LED display is
Each light emitting diode of RGB is used as one pixel, and RGB is combined and arranged in close proximity to form one pixel. It is configured by arranging each pixel in a matrix.

More specifically, each light emitting diode is electrically connected to one electrode of the light emitting element, and is electrically connected to the other electrode of the light emitting element using a conductive wire or the like. The inner lead, a light emitting element, a mount lead, and a mold member covering a part of the inner lead. As the semiconductor light emitting element used for each light emitting diode, a semiconductor light emitting element capable of emitting light of each of RGB is used. A colorant having a filter effect is suitably added to the mold member so that desired emission characteristics can be obtained.

A multi-color or full-color image can be displayed by adjusting the amount and time of current supplied to each light emitting diode of an LED display to emit mixed colors.

In order to make the LED display emit light with higher luminance and stably, it is more preferable to use four or more elements in which one or more elements selected from RGB are added to RGB light emitting diodes. In particular, it is currently difficult to form all RGB light emitting diodes with the same semiconductor material. Therefore, specifically, a nitride-based compound semiconductor is used for the light-emitting layer in order to emit blue or green light-emitting diodes with ultra-high brightness. On the other hand, in order to make a red light emitting diode emit light with ultra-high brightness, a semiconductor material such as indium / gallium / aluminum / phosphorus is used as a light emitting layer. The semiconductor material and the structure are different between the red system and the blue system and the green system.

[0006] In this case, the driving voltage, the light emission luminance, and the like are different due to semiconductor characteristics and the like. Therefore, there are cases where two red light emitting diodes whose driving voltage is about half that of blue or green light are used. That is, it is conceivable to use four red and two red light elements each for one blue light and one green light to constitute one pixel. Similarly, Japanese Patent Application Laid-Open
As described in JP-A-272316, in order to expand a display area on a chromaticity diagram, there may be a case where four elements each using one red system and one blue system and two green systems. Furthermore, 4
As an example of the device, one red light system and one green light system are used to adjust the luminous intensity, and two blue light systems with low emission luminance are used.
In some cases, four elements are used. In some cases, four or more elements are arranged in one pixel to increase light emission luminance.

Accordingly, in the case of using an LED display having one pixel using not only three elements but also one or more light-emitting diodes of the same color, which is one of the three primary colors, in addition to the three primary colors due to various circumstances. There is. Among them, four-element LE
The D display is suitably used because the light emitting diodes can be easily arranged and the display surface looks uniform even when no light is emitted.

FIGS. 1 and 2 show an example of a four-element LED display as a specific example. RGB on the substrate 202
In addition to the light emitting diodes described above, a light emitting diode capable of emitting R light is added, and four light emitting diodes 101 are arranged vertically and horizontally close to each other to form one pixel. Items arranged for each pixel are arranged in a matrix. Each light emitting diode 201 is electrically connected to a conductive pattern provided on the back surface side of the substrate 202 by solder or the like. The substrate 202 is disposed and fixed in the housing 203 and is covered with a highly weather-resistant silicone resin 205 to protect the light emitting diode 201 from the external environment except for the tip of the mold. Further, a louver 204 serving as a light shielding member is suitably provided in order to prevent a decrease in visibility due to irradiation from sunlight or the like. Such an LED display 100 is
Each of the picture elements can be stably emitted with high luminance, or a display color with a wide chromaticity range can be displayed. Also,
Since one pixel is constituted by using four elements, it is arranged in a regular manner, and the appearance at the time of non-lighting is good.

[0009]

SUMMARY OF THE INVENTION However, RGB
In the three elements using one light emitting diode, the arrangement of each pixel becomes distorted. Further, as compared with an LED display in which one light emitting diode of each of RGB is used and one pixel is used, for example, the display area is increased by one color when, for example, four elements are used. Therefore, when viewed from a certain angle such as left and right or up and down at the time of full lighting such as white light, the color balance tends to be lost. In particular, when a light emitting diode having a mold containing a coloring agent is turned on, the entire mold member is colored in the color of each light emitting diode.

[0010] Therefore, when viewed from a certain angle, a phenomenon occurs in which the mold member is colored with the lighting of the front light emitting diode, and the light emission of the light emitting diode at the back is blocked. Similarly, when viewed from a certain vertical angle, the light emitting diode is partially hidden by the louver, and the light emitting diode is blocked, thereby causing a kicking phenomenon. As a result, the light emission balance of RGB is easily lost, and the display surface is distorted, so that color shift is particularly likely to occur. Since it is inevitable to arrange the light emitting diodes densely to some extent in consideration of the color mixing property and the like, the problem becomes larger as the number of light emitting diodes increases. The present invention has been made in view of the above problems, and has an object to provide an LED display which has a good appearance at the time of non-lighting and has very little color shift, and a display device using the same.

[0011]

SUMMARY OF THE INVENTION The present invention provides an LED in which one pixel composed of three or more light emitting diodes is arranged in a matrix as respective picture elements capable of emitting RGB light.
It is a display. In particular, the picture elements constituting a block with three or more pixels and constituting the pixels in the block are arranged differently from each other, and are LED displays in which the blocks are repeatedly arranged. As a result, a color shift or the like that could not be solved only between pixels can be solved by using a block in which pixels are combined.

The LED display according to a second aspect of the present invention is an LED display in which each light emitting diode has a mold member colored in the same color as the emission color. As a result, even when the adjacent light emitting diodes are significantly kicked, an LE that can emit uniform white light at the time of full light emission or the like can be obtained.
It can be a D display.

According to a third aspect of the present invention, there is provided the LED display, wherein the light emitting diode is a light emitting diode as each picture element capable of emitting RGB light, and one more light emitting diode selected from RGB in addition to the light emitting diode. Is an LED display that constitutes one pixel with four elements. This makes it possible to arrange the light emitting diodes regularly and densely, thereby providing an LED display with good color mixing and little color shift. In addition, it is possible to simplify the driving circuit, improve the appearance when not lit, and the like.

In the LED display device according to the fourth aspect of the present invention, each vertical line and each horizontal line are not adjacent to each other except for the light-emitting diodes of the color emitted by one more light-emitting diode selected from RGB in the block. It is an LED display arranged. This makes it possible to provide an LED display with less color shift even when it is kicked in the vertical direction.

According to a fifth aspect of the present invention, in the LED display, the light emitting diodes in the block include RGB light emitting diodes and the R light emitting diodes on each vertical line and each horizontal line.
LED including a kind of light emitting diode selected from GB
It is a display.

According to a sixth aspect of the present invention, in the LED display device, in addition to each pixel capable of emitting RGB, RGB
An LED display device in which pixels each composed of four elements combined with one pixel selected from the following are arranged in a matrix and a driving device for driving the LED display device is electrically connected. In particular, if the LED display is 3
This is an LED display device in which a block is constituted by pixels or more, and picture elements constituting pixels in the block are arranged differently from each other and the blocks are arranged repeatedly.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The inventor of the present invention
Invented based on this finding that color shift can be prevented by adding the color shift of the light emitting diode of the element or more to the displacement of each pixel and adjusting the arrangement of the light emitting diode for each block including a plurality of pixels. I came to.

That is, three or more elements can display multi-color or full color with high luminance. In particular, a light emitting diode selected from RGB is added to an RGB light emitting diode.
The LED display using the element as one pixel has an advantage that the pixels can be arranged densely and the characteristics of the RGB light emitting elements can be made uniform. However, in the case of three elements, the number of colors increases by one color in addition to the arrangement of the three primary colors. According to the present invention, the color shift as a whole is suppressed by using another pixel arranged in the vicinity of one pixel that cannot absorb the color shift only by the rearrangement of each pixel.

Hereinafter, the present invention will be described in detail with reference to the drawings. 3, 4, 5, and 6 show schematic partial plan views of the LED display of the present invention. Each LED display is formed in substantially the same manner as the configuration of FIGS. 1 and 2 except for the arrangement of the light emitting diodes. In addition, the mold member of the light emitting diode has an elliptical shape when viewed from the light emission observation surface side in order to widen the viewing angle. Each light emitting diode is provided with a semiconductor light emitting element capable of emitting RGB light. (FIGS. 3, 4,
RGB (red, green, and blue) are exemplarily described in 5 and 6 so that the arrangement of the picture elements can be understood.) In the case of FIGS. 3, 4, and 5, in addition to the light emitting diodes capable of emitting RGB light, one more R is arranged to make four elements.
One pixel of the LED display is displayed using four elements.
FIG. 6 shows an example in which a pixel is composed of three elements using a light emitting diode capable of emitting RGB light.

In a specific LED display of the present invention, the color shift is suppressed by periodically arranging the blocks while changing the arrangement of the RGB light-emitting diodes constituting one pixel in the block. . Specifically, an example of four elements is shown in FIG. FIG. 3 is a partial plan view of the LED display in which 16 × 16 pixels are arranged as viewed from the light emission observation surface. As indicated by a dotted line 302, R is increased by one in the RGB light emitting diodes, and one pixel is constituted by four elements. Also, by using three of these pixels vertically and horizontally, an alternate long and short dash line 30
One block is formed as in 1. The LED display is configured by repeatedly arranging the blocks. When one pixel in the block is viewed from the light emission observation surface side, the configuration in one pixel as shown in the upper left of FIG. 3 is shown.

More specifically, the pixel is located at the upper left corner of R
(Red) light emitting diode and B located at the lower left
(Blue) light emitting diode and G
(Green) light emitting diode and R arranged at the lower right
(Red) light emitting diodes.
The pixel on the right side adjacent to this pixel is the R on the upper left.
(Red) light emitting diode and G
It is composed of a (green) light emitting diode, a B (blue) light emitting diode disposed at the upper right, and an R (red) light emitting diode disposed at the lower right. Similarly, adjacent lower pixels include an R (red) light emitting diode disposed at the upper left, a G (green) light emitting diode disposed at the lower left, and a B (blue) light emitting diode disposed at the upper right. A light emitting diode and an R (red) light emitting diode arranged at the lower right are arranged.

An LED display in which one pixel constituted by three or more light-emitting diodes is arranged in a matrix as each picture element capable of emitting RGB light,
The picture elements constituting a block with three or more pixels and constituting the pixels in the block are arranged differently from each other, and the blocks are arranged repeatedly. Therefore, even when one vertical column is kicked by a light emitting diode for each pixel, RBRG or RGRB is included in one block.
Is included. In addition, even when a lower row of light emitting diodes is kicked by a louver or the like as a light shielding member, one block includes an array of RGRB or RBRG. In the block, RGB and R components emit light. Therefore, the color shift L is small.
It can be an ED display. (Note that, in the present invention, four elements mean that one pixel is formed by using mixed light emission using four light emitting diodes.) Next, another specific example of the present invention will be described. FIG. 4 is also a partial plan view of the LED display in which 16 × 16 pixels are arranged as viewed from the light emission observation surface. As indicated by a dotted line 402, one R is added to the RGB light emitting diodes to form one pixel densely arranged with four elements. In addition, one block is formed as indicated by a dashed line 401 by using four pixels in the vertical and horizontal directions. An LED display is constructed by periodically arranging the blocks. When one pixel in the block is viewed from the light emission observation surface side, the configuration in one pixel as shown in the upper left of FIG. 4 is shown. The pixel includes an R (red) light emitting diode disposed at the upper left, a B (blue) light emitting diode disposed at the lower left, a G (green) light emitting diode disposed at the upper right, and a lower right light emitting diode. One pixel is arranged by the arranged R (red) light emitting diode. The right pixel adjacent to this pixel includes a B (blue) light emitting diode disposed at the upper left, an R (red) light emitting diode disposed at the lower left, and an R (red) light emitting diode disposed at the upper right. It is formed of a light emitting diode and a G (green) light emitting diode disposed at the lower right.

Similarly, adjacent lower pixels include a G (green) light emitting diode disposed at the upper left, an R (red) light emitting diode disposed at the lower left, and an R (red) disposed at the upper right. LED) and B arranged at the lower right
(Blue) light emitting diodes are arranged. Similarly, adjacent pixels in the diagonally lower right direction are the pixels arranged in the upper left.
(Red) light emitting diode and G
A (green) light emitting diode, a B (blue) light emitting diode arranged at the upper right, and an R (red) light emitting diode arranged at the lower right are arranged.

As described above, by arranging adjacent pixels in a block with mutually different picture elements and periodically arranging them in block units, any pixel can have a different arrangement of light emitting diodes. Therefore, even when one of the vertical columns is kicked by a light emitting diode for each pixel, the RBGR or BRRG arrangement is included in one block, and uniform white light emission is possible. Further, even when the lower row of light emitting diodes is kicked by a louver or the like which is a light shielding member, the arrangement of RGBR or GRRB is included. Even if a light emitting diode is kicked, the RGB and R components emit light evenly in the block. Therefore, no matter which one of the components of the light-emitting diode is included, an LED with very little color shift
It can be a display. It should be noted that L in the arrangement of FIG.
The ED display does not look reddish or bluish green when viewed from obliquely below as compared to FIG. 3, and can be an LED display with less color change.

Next, still another specific example of the present invention will be described. FIG. 5 is also a partial plan view of the LED display in which 16 × 16 pixels are arranged as viewed from the light emission observation surface. Dotted line 50
As shown in 2, the R is increased by one for the RGB light emitting diode, and
One pixel is densely arranged with elements. In addition, one block is formed as shown by a dashed line 501 by using four pixels in the vertical and horizontal directions. An LED display is constructed by periodically arranging the blocks. When one pixel in the block is viewed from the light emission observation surface side, the configuration in one pixel as shown in the upper left of FIG. 5 is shown.

The pixel includes a B (blue) light emitting diode disposed at the upper left, an R (red) light emitting diode disposed at the lower left, an R (red) light emitting diode disposed at the upper right, and One pixel is arranged by a G (green) light emitting diode arranged at the lower right. The right pixel adjacent to this pixel is R (red) arranged at the upper left.
, A light emitting diode of B (blue) disposed at the lower left, a light emitting diode of G (green) disposed at the upper right, and an R (red) light emitting diode disposed at the lower right. ing.

Similarly, adjacent lower pixels include a G (green) light emitting diode disposed at the upper left, an R (red) light emitting diode disposed at the lower left, and an R (red) disposed at the upper right. LED) and B arranged at the lower right
(Blue) light emitting diodes are arranged. Similarly, adjacent pixels in the diagonally lower right direction are the pixels arranged in the upper left.
(Red) light emitting diode and G
A (green) light emitting diode, a B (blue) light emitting diode arranged at the upper right, and an R (red) light emitting diode arranged at the lower right are arranged.

As described above, by arranging adjacent pixels in a block with mutually different picture elements and periodically and repeatedly arranging them in block units, the arrangement of light emitting diodes can be different from each other. Therefore, even when one of the vertical columns is kicked by a light emitting diode for each pixel, the BRGR or RBRG arrangement is included in one block, and uniform white light can be emitted. Further, even when the lower row of light emitting diodes is kicked by a louver or the like as a light shielding member, the arrangement of BRRG or GRRB is included.
Even if a light emitting diode is kicked, the RGB and R components emit light evenly in the block. Therefore, an LED display with extremely little color shift can be provided regardless of which component of the light emitting diode is included. The LE shown in FIG.
The D display does not look reddish or bluish green when viewed from obliquely below as compared with FIG. Further, since the RR does not continue vertically as shown in FIG. 4, the remaining R does not feel much, and an LED display with a very small color change can be provided.

FIG. 6 shows an example of three elements as an example other than the four elements. FIG. 6 shows L in which 16 × 16 pixels are arranged.
It is the partial top view seen from the light emission observation surface side of the ED display. The light emitting diode is formed by a shell-shaped mold member. As indicated by a dotted line 602, one pixel is formed using RGB light emitting diodes. In addition, one block is formed as shown by a dashed line 601 by using four pixels in the vertical and horizontal directions. An LED display is constructed by periodically arranging the blocks. When one pixel in the block is viewed from the light emission observation surface side, the configuration in one pixel as shown in the upper left of FIG. 6 is shown.

Each pixel is composed of an R (red) light emitting diode disposed at the upper left, a G (green) light emitting diode disposed below, and a B (blue) light emitting diode disposed at the upper right. Pixels are arranged. The right pixel adjacent to this pixel is composed of an R (red) light emitting diode disposed at the lower left, a G (green) light emitting diode disposed at an upper position, and a B (blue) light emitting diode disposed at a lower right position. Of light emitting diodes.

Similarly, adjacent lower pixels include a B (blue) light emitting diode disposed at the upper left, a G (green) light emitting diode disposed at the lower left, and an R (light emitting) diode disposed at the upper right.
(Red) light emitting diodes are arranged. Also,
Neighboring pixels in the diagonally lower right direction are B pixels arranged in the lower left.
A (blue) light emitting diode, a G (green) light emitting diode arranged above, and an R (red) light emitting diode arranged at the lower right are arranged.

In this manner, by arranging adjacent pixels in a block with different picture elements and periodically arranging them in block units, all the pixels can have different arrangements of light emitting diodes. Therefore, even when the lower row of light emitting diodes is kicked by a louver or the like as a light shielding member, the arrangement of RGB or BRG is included. Irrespective of which light-emitting diode is generated, the RGB components emit light uniformly in the block. Therefore, an LED display with less color shift can be provided. Although three and four elements are shown as examples, it goes without saying that five or more elements can be similarly formed. This makes it possible to provide an LED display with very little color misregistration in the viewing direction when fully lit. Hereinafter, each configuration of the present invention will be described in detail.

(Light emitting diodes 101, 201, 30
3, 403, 503, 603) The light emitting diode 101 used in the present invention functions as a picture element constituting one pixel. Suitable examples of the light emitting diode include a light emitting element formed by molding various semiconductors as desired with resin or glass, a chip type LED in which a light emitting element is arranged in a package, and the like. As a light emitting device, a liquid phase growth method or MOCV
ZnS, ZnSe, SiC, Ga
P, GaAs, GaAlP, GaAlAs, AlInG
aP, AlInGaAs, GaN, InN, AlN, G
A light emitting layer formed of a semiconductor such as aAlN, InGaN, or AlInGaN is preferably used. Examples of the semiconductor structure include a homostructure having a MIS junction, a PIN junction, and a pn junction, a heterostructure, and a double heterostructure. In addition, a single quantum well structure or a multiple quantum well structure in which the light emitting layer is a thin film in which a quantum effect occurs can be used. The emission wavelength can be variously selected from the ultraviolet region to the infrared region depending on the material of the semiconductor layer and the degree of mixed crystal thereof.

The light emitting diode mold member is an LED.
It is suitably provided to protect the chip from the outside. In addition, by including an organic or inorganic diffusing agent in the mold member, the directivity from the LED chip can be reduced and the viewing angle can be increased. Suitable examples of the diffusing agent include inorganic members such as barium titanate, titanium oxide, aluminum oxide, and silicon oxide, and organic members such as melamine resin, CTU guanamine resin, and benzoguanamine resin. Further, by including a coloring agent such as a coloring dye or a coloring pigment, a filter effect of cutting unnecessary wavelengths can be provided.

Further, by forming the mold member into a desired shape, it is possible to provide a lens effect of converging or diffusing light emitted from the LED chip. When observed from the light emitting surface side, various shapes such as a perfect circle, an ellipse, a rectangle, a square, and a polygon can be selected as desired. When used outdoors, an elliptical shape having a wide viewing angle in the lateral direction is more preferable. Further, a structure in which a plurality of mold members are stacked may be employed. Specifically, a convex lens shape, a concave lens shape, and a combination thereof are mentioned. As a material of the mold member, a translucent member having excellent weather resistance, such as an acrylic resin, an epoxy resin, a urea resin, or glass, is suitably used.

When the use of an LED display device is considered in the field, it is preferable to use a gallium nitride compound semiconductor for the light emitting layer as a green or blue light because of ultra-high brightness and stable light emission characteristics. In the system, it is preferable to use a gallium-aluminum-arsenic-based or aluminum-indium-gallium-phosphorus-based semiconductor for the light emitting layer.

In order to use an LED chip as a multi-color or full-color display, a red main emission wavelength is 600 nm to 700 nm, a green main emission wavelength is 495 nm to 565 nm, and a blue main emission wavelength is 400 nm. It is preferable to use an LED chip using a semiconductor within a wavelength of from 490 nm to 490 nm.

(Substrate 202) The substrate 202 on which the light emitting diodes 201 are arranged is used for arranging the respective light emitting diodes 201 as desired and electrically connecting them. They may be combined. As the substrate 202 for the light emitting diode, a substrate having high mechanical strength and low thermal deformation is preferable. Specifically, a substrate using ceramics, glass or various resins can be suitably used. Substrate 20 on which light emitting diode is mounted
Since the surface of No. 2 coincides with the LED display surface, it is more preferable that the surface is colored dark in order to improve the contrast.
In addition, unevenness processing may be performed to improve adhesion to the filler 205. Each light emitting diode 201 is provided on a substrate 202.
A conductive pattern is formed of copper or the like so that the device can be driven.

(Cases 103 and 203) The case 203 is preferably used for mechanically protecting the light emitting diodes 201 arranged in a desired shape such as a matrix form on the substrate 202 from the outside. Therefore, the housing 203 can be formed in a desired size and a desired shape. It is preferable that the housing has excellent adhesion to the filler. As a material for the housing, a polycarbonate resin, an ABS resin, an epoxy resin, a phenol resin, or the like is preferably used because of ease of molding. In addition, a concave portion is provided in the housing, and the angle of the light shielding plate can be variously changed depending on the shape of the concave portion by fitting the convex portion of the light shielding member. Further, the inner surface of the housing may be embossed to increase the bonding area, or the plasma treatment may be performed to improve the adhesion with the filler.

(Light shielding members 104, 204, 304, 40
4, 504, 604) The louver, which is the light shielding member 104, is suitably used in order to prevent each of the light emitting diodes 101 from being difficult to see due to extraneous light.
Further, the light shielding member 104 can be used as a heat conducting member that collects heat generated from the light emitting diode 101 via the filler and radiates heat to the outside. Specifically, heat dissipation can be improved by forming the light shielding member from aluminum, stainless steel, various alloys, or the like. Further, it is preferable to color the light shielding member black or the like for the purpose of improving the light shielding efficiency. It is more preferable that the light-shielding member 204 is configured by aligning the concave portion of the housing 203 with the wing so that the angle can be changed according to the viewing distance.
As the arrangement of the light shielding member 204, the heat collection efficiency can be increased by disposing the filler 205 between the light emitting diodes 201 in a matrix. In this case, the light blocking members 204 may be formed in a matrix between the light emitting diodes 201, or may be provided along rows or columns between the light emitting diodes.

(Filling Material 205) The filling material 205 preferably has good adhesion to the light emitting diode 201, the housing 203, the substrate 202 on which the light emitting diode is disposed, and the light shielding member 204. The filler 205 is required to have mechanical strength and weather resistance to protect the internal circuit. Further, it is preferable to efficiently conduct heat generated from the light emitting diode 201 to the outside. Specific examples of such a filler 205 include an epoxy resin and a silicone resin. Further, an infrared reflecting member such as titanium oxide can be contained in the filler. This makes it possible to provide an LED display in which the influence of heat from extraneous light is reduced.

(Drive Unit 206) The drive unit 206 has a lighting circuit and the like and is electrically connected to the LED display of the present invention. Specifically, the light emitting diodes 201 arranged in a matrix are driven by output pulses from the driving circuit. As the driving circuit, a RAM (Rando) for temporarily storing input display data is used.
m, Access, Memory) and a gradation control circuit for calculating a gradation signal for lighting the light emitting diode 201 to a predetermined brightness from data stored in the RAM;
A driver that is switched by the output signal of the gradation control circuit and turns on each light emitting diode 201;
The gradation control circuit calculates a lighting time and / or luminance of each light emitting diode 201 from data stored in the RAM, and outputs a pulse signal. The gradation signal, which is a pulse signal output from the gradation control circuit, is input to the driver of the light emitting diode 201 to switch the driver. The light emitting diode 201 is turned on when the driver is turned on, and is turned off when the driver is turned off. Thereby, a desired emission color can be obtained. Hereinafter, examples of the present invention will be described, but it goes without saying that the present invention is not limited to only specific examples.

[0043]

【Example】

(Example 1) InGaAlAs (emission wavelength: 660) was used as the semiconductor of the red, green, and blue light emitting layers, respectively.
nm), InGaN (emission wavelength 525 nm), InGa
An LED chip using N (emission wavelength: 470 nm, the emission wavelength was shortened with respect to the green system by reducing the In content) was used. Each LED chip is mounted on a mounting lead with an Ag paste or the like, and is electrically connected to the mounting lead and the inner lead. Further, a mold member having a lens effect is formed of epoxy resin for the purpose of protecting the LED chip from the external environment. Each mold member contains a colorant of the same color as each emission color according to the emission color of the LED chip. Further, each light emitting diode is configured so as to match the directional characteristics. Such a light emitting diode was arranged on a substrate made of glass epoxy resin by an automatic mounting apparatus as shown in FIG. The leads of each light emitting diode are electrically connected to a conductive pattern on a substrate by an automatic soldering device (not shown).

Each pixel 502 has four elements by adding a light emitting diode capable of emitting R light in addition to a light emitting diode capable of emitting RGB light. Note that two Rs are connected in series and the drive voltage is adjusted to B and G. Each pixel is arranged at a constant dot pitch so as not to impair the color mixing property and to be able to be recognized independently. Note that L
The dot pitch of the pixels located at both ends of the ED display is 9.75 mm, and the other dot pitch is 10.5 m.
It is made narrower than m. Thereby, a sense of discomfort when a plurality of LED displays are arranged can be reduced.
In addition, four pixels are collected vertically and horizontally to form one block 501, and the light emitting diodes in the block 501 are formed of pixels having a different arrangement except for R. The light emitting diodes arranged on the substrate were arranged inside the housing for each substrate and fixed with screws. Except for the tip of the light emitting diode, the housing, the light emitting diode and the substrate were filled with silicone resin. The silicone resin was cured to form an LED display.

In such an LED display, each of the RGB light-emitting diodes constituting adjacent pixels is arranged independently and for each block. A driving device can be electrically connected to the formed LED display as shown in FIG. 2 to obtain an LED display. Even if the LED display device is kicked by a light emitting diode or a louver, which is an adjacent picture element in a pixel, there is a light emitting component of RGBR from both vertical and horizontal directions, so that color shift in a viewing direction is extremely reduced. Can be.

[0046]

As described above, the LED display and the display device using the same according to the present invention provide one or two types of picture elements in addition to the arrangement of the three primary colors or the three primary colors. By arranging the picture elements in each pixel and making the pixels block-wise, the color shift that occurs due to the use is very different in the emission color depending on the viewing direction and angle even in the simultaneous emission of RGB such as white light. Low LED
It can be a display and a display device using the same. In particular, even in a four-element LED display capable of improving various characteristics, it is possible to obtain an LED display with a very small color change even when kicked from various directions.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an LED display of the present invention.

FIG. 2 is a schematic sectional view taken along the line AA in FIG.

FIG. 3 is a schematic partial plan view showing the arrangement of the light emitting diodes of the present invention.

FIG. 4 is a schematic partial plan view showing another light emitting diode arrangement of the present invention.

FIG. 5 is a schematic partial plan view showing another light emitting diode arrangement according to the present invention.

FIG. 6 is a schematic partial plan view showing still another light emitting diode arrangement of the present invention.

[Explanation of symbols]

100 ... LED display 101, 201, 303, 403, 503, 603 ...
-Light emitting diodes 103, 203 ... housings 104, 204, 304, 404, 504, 604 ...
-Louver 202-Substrate 205-Filler 206-Driving device 301, 401, 501, 601-1 block 302, 402, 502, 601-1 pixel

Claims (6)

[Claims] 1. An LED display in which one pixel composed of three or more light emitting diodes is arranged in a matrix as respective picture elements capable of emitting RGB light, wherein a block is composed of three or more pixels. A picture element constituting a pixel is arranged differently from each other, and the blocks are arranged repeatedly. 2. The LE according to claim 1, wherein each light emitting diode has a mold member colored in the same color as the emission color.
D display. 3. The one pixel comprises four elements in which a light emitting diode as each picture element capable of emitting RGB light and one light emitting diode selected from RGB in addition to the light emitting diode are combined. LE described
D display. 4. Each of the light emitting diodes in the block is:
4. The LED display according to claim 3, wherein a color other than a color emitted by one more light emitting diode selected from the RGB is arranged so as not to be adjacent to each vertical line and each horizontal line. 5. The LED display according to claim 3, wherein the light emitting diodes in the block include an RGB light emitting diode and a kind of light emitting diode selected from the RGB in each vertical line and each horizontal line. 6. An L in which pixels composed of four elements are arranged in a matrix by combining one picture element selected from RGB in addition to each picture element capable of emitting RGB light.
An LED display device in which an ED display and a driving device for driving the LED display are electrically connected, wherein the LED display forms a block with three or more pixels, and forms a pixel in the block. A plurality of picture elements having different arrangements, and the blocks are repeatedly arranged.