JP2001154635A - Led display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which facilitates connections between different kinds of LED display units, and permits arbitrary location of each unit and various displays. SOLUTION: This LED display device is comprising a 1st LED unit 101 provided with a 1st display part 3 where pixels having plural light emitting elements and emitting one or more kinds of luminescent colors are arranged in matrix form, 1st data storage means IR, IG, IB for sequentially transferring display data corresponding to the luminescent colors, and a 1st control part 2 for controlling to turn on each light emitting element according to display data, and a 2nd LED unit 102 provided with a 2nd display part with less kinds of luminescent colors than those for the 1st LED unit, a data storage means 1W, and a control part; and electrically connecting a data bus 4 for transferring display data commonly to the data storage means of both units, and the 2nd LED unit has a 3rd data storage means 1P1, 1P2 arranged correspondingly to the 1st data storage means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED display device having a plurality of LED units each having a plurality of LEDs arranged in a matrix, and having a high degree of freedom in the type, arrangement or expression of each LED unit. It relates to a display device.

[0002]

2. Description of the Related Art An LED display device that displays an image by arranging a plurality of LEDs vertically and horizontally and further arranging a plurality of LED units is used for various purposes. As an LED display unit, for example, red, green, blue, ie, RG
B3 LEDs are arranged close to each other to form one pixel and are arranged in a matrix to realize a multi-color LED display unit.
There is an LED unit having two pixels of green and one LED.

[0003] Such an LED display unit having a structure in which one pixel is formed by LEDs of different emission colors, for example, in the case of a multi-color, an LE of each color (RGB).
The emission luminance of D is controlled by the gradation data to adjust the emission color and brightness.

With the advancement of LEDs, two-color LED units in which relatively old pixels are red, green or the same color system as one pixel, and LED units in which a pixel is constituted by one single-color LED are also available. Images can be displayed and expressed in various luminescent colors. However, these LED units are usually arranged in a plurality of the same type to form an LED display device. However, an LED display device in which different LED units are mixed is rarely used.

[0005] However, as described above, various types of LED units have been developed in recent years due to multi-color and high-brightness of LEDs. There has been a demand for a display device capable of performing various displays.

[0006]

An LE combining a plurality of different types of LED units, such as multicolor and single color, is described.
For example, FIG. 7 shows multi-color and single-color LE display devices.
It is most common to provide one data bus line for each type of LED unit, as shown by combining D units. However, as shown in FIG. 7, in such a method, a certain limitation is added to the expression form of the LED display device, or a length of a cable connecting each LED unit is increased, and a limitation is imposed on a driving frequency. Or

It is also possible to connect different LED units in a single data bus line shape. For example, as shown in FIG. 6, a single color LED unit can be connected only to the terminal end in the data transfer direction. And the arrangement of the LED units is restricted.

Furthermore, connecting each LED unit with complicated wiring as described above makes the operation of assembling the LED display device complicated, and requires extra space for connecting each LED unit. And the size of the entire LED display device increases.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can be handled in the same manner as a conventional LED display device in which a plurality of LED units having the same kind of luminescent color are arranged. Further, a module unit for turning on and driving the LED can also be used, and it is possible to provide an LED display device which can easily assemble an LED unit and can perform various expressions. That is, by making the number of data storage means included in each LED unit the same regardless of the type of emission color, it is possible to arrange LED units of different types arbitrarily. The surplus display data can be ignored, or the display data can be used to increase the number of dots in the multi-gradation expression and display section.

That is, the LED display device of the present invention has the following configurations (1) to (3).

(1) A first method in which pixels having a plurality of light-emitting elements and emitting one or more kinds of emission colors are arranged in a matrix.
A first data storage means for sequentially transferring and storing display data respectively corresponding to the emission colors;
A first LED unit having at least a first control unit for controlling lighting of each light emitting element according to the display data stored in the data storage means, and a type of light emission color is smaller than that of the first LED unit, A second display unit in which pixels using the respective luminescent colors are arranged in a matrix, a second data storage unit for sequentially transferring and storing display data corresponding to the respective luminescent colors, and the second data storing unit A second LED unit having a second control unit for controlling lighting of each light emitting element by display data stored in the means, and displaying the data in each data storage means of the first LED unit and the second LED unit. An LED display device electrically connected to a data bus for transferring data in common, wherein the second LED unit includes a first data storage unit and a first data storage unit. And having a third data storage means provided corresponding to the data storage means. Due to this, the emission color is different as before,
The first LED unit and the second LED unit cannot be connected using the same data bus due to different data storage means or need to be connected via some data conversion means. In addition, connection is possible with an arbitrary arrangement, and various display devices can be obtained.

(2) In the second unit, at least one kind of luminescent color is multi-graded by the stored display data using the third data storage means. And The third data storage means for compensating for the difference between the different LED units is to be used effectively, and the display data stored here is added to the display data of the second data storage means to thereby obtain the second data storage means. The second LED unit can have multiple gradations as compared with the case where only the storage means is used for display. That is, a display device including LED units having different gradations can be easily realized without requiring a complicated design change.

(3) In the second unit, the second display section is divided into at least two or more sets, and the third data storage means is assigned to each of the divided sets. , Characterized in that each set of LEDs of the display unit is turned on by the stored display data. Thus, the number of pixels of the second LED unit can be easily increased only by changing the design of the second display unit, and a display device including LED units having different numbers of pixels can be easily realized. Things.

[0014]

FIG. 8 is a block diagram showing the entire display device of the present invention. The display device of the block diagram has a configuration in which a plurality of LED dot matrix units are connected via a distribution board or the like, and display data is input to data storage means. Each L
The ED unit has a display unit in which pixels made up of LEDs are arranged in a matrix, a data storage unit that transfers and stores display data, and takes in the display data stored in the data storage unit to control lighting of each LED. A control unit.

Each LED unit has a dynamic lighting system in which the LEDs are divided into a plurality of groups and the divided LEDs are lighted in a time-division manner, and a static lighting system in which the LEDs are not divided. In this way, the LED on the display
Is called one frame. For example, in the case of dynamic lighting and a display unit of 16 × 16 dots, one image is displayed for 16 msec (frequency is 60 Hz).
, The display time for one column is 1 msec. At this time, one row of LEDs may perform the gradation expression by controlling the lighting time during 1 msec to the gradation data and adjusting the light emission luminance.

In the conventional LED display device, as shown in FIG. 8, each LED unit connected by a cable or the like and connected to one data bus has the same type of luminescent color forming a pixel. Was. For example, a plurality of multi-color LED units each having one light-emitting element for each of the three colors of RGB as one pixel are connected to the data bus.

However, the LED display device of the present invention uses an LED having pixels of various kinds of luminescent colors on the data bus.
Units are arbitrarily arranged. More specifically, the LED units on the same data bus have at least two or more LED units having different emission colors.

For example, when there are two types, the first one having a large number of emission colors and the second one having a small number of colors are used.
Each LED unit has at least first and second data storage units and a control unit, and the second LED unit has a second data storage unit corresponding to the emission color. And a third data storage unit that does not correspond to the emission color. More specifically, since the second LED unit has only a small number of types of luminescent colors constituting pixels, the data storage means (second data storage means) required for displaying the data is stored in the first LED unit. This means is different from the means (first data storage means), and it is impossible to arrange each LED unit at an arbitrary position on the same data bus as it is.
Therefore, by adding a third data storage unit corresponding to the difference between the first and second data storage units to the second LED unit, any data change unit can be interposed on the same data bus. Each LED unit can be easily connected with a cable or the like, and can be arranged arbitrarily.

Here, the present invention is not limited to the above two types of LED units, but may be three or more types. For example, even when three or more types of LED units are on the same data bus, the first and second LED units whose emission color types have the above relationship are selected, and the data storage unit is similarly set. It should be taken into account. At this time, among the LED units, a light emitting color corresponding to the data storing means, that is, an LED unit having a smaller number of kinds of light emitting colors is provided with a data storing means corresponding to the difference thereof. What should I do?

FIG. 1 shows how LED units are connected on the same data bus. Each LED unit is
A data bus is used to transfer the display data in common by a cable or the like. On the data bus, the display data is allocated for each type of luminescent color, and is transferred and stored by the data storage means of each LED unit. . In the LED display device of the present invention, as described above, in the LED unit having a small number of luminescent colors, in addition to the data storage means corresponding to the type of the luminescent color, another LED unit having a large number of luminescent colors is used.
A data storage means is provided in accordance with the ED unit, and the display data allocated to the emission color is stored in each LE on the same data bus.
It can be transferred to the D unit and stored. Specifically, as shown in the figure, the shift register, which is the data storage means of each unit, stores the input display data in the corresponding shift register for each type of luminescent color, and the control unit The gradation and the like are processed, and each LED of the display unit is turned on by the lighting output circuit. At this time, as described above, if the LED units are of the same type, as described above, it is as described above. However, when LED units of different types are connected as in the present invention, the LED units do not necessarily correspond to the emission colors. Since no data storage means is provided, processing inside the control unit or the module responsible for driving is different as described later.

Therefore, the LED display device of the present invention has at least a plurality of different types of LED units connected on the same data bus, and the data storage provided by each LED unit on the data bus. The means are equivalent as described above. That is, the conventional LED
Similarly to the display device, the display data allocated to the type of the emission color can be transferred to each LED unit on the data bus and stored.

Here, as shown by the shift register in FIG. 1, the display data passes through data storage means in each LED unit, and each LED unit is connected by a cable, and is located at the end of the data flow. The display data is stored from the shift registers of the LED units, and when the display data is stored in the shift registers of all the units, the data is latched and input to the logic circuit.

In the present invention, one data storage means in the LED unit is assigned to one type of luminescent color constituting one pixel, and each data storage means stores display data for each type of luminescence. Is stored.

In the present invention, one pixel is one dot of a dot matrix display portion in the LED unit, and is a unit of coloring. Further, the pixel is composed of one or more kinds of emission colors, and each of these emission colors has one color.
It is configured by using at least two light emitting elements (LEDs). For example, when a pixel is composed of three colors (types) of RGB as emission colors, three emission colors of R, G, and B are defined as one pixel. Therefore, two or more LEDs may be used for one emission color. Specifically, three colors of RGB may be constituted by four LEDs, and LEDs having lower luminance than other colors may be used.
And one pixel. Here, as the types of the emission colors, the same three emission colors or the three colors of the light emitting elements RGB having the same emission color have been exemplified, but the present invention is not limited to this, and one pixel is formed by combining various LEDs. Things are available.

In the LED unit having a small number of emission colors, the data storage means of the other LED units are provided with data storage means provided to compensate for the shortage (for example, the third data storage means). In the present invention, various expressions can be provided to the LED unit by using at least a part of the emission color in the present invention. That is,
In addition to the data storage means not corresponding to the luminescent color, the data storage means corresponding to the luminescent color, that is, assigning two or more data storage means to one kind of luminescent color. At this time, it is not necessary to use all of the data storage means that do not correspond to the emission color for emitting light from the LED. Below, 2
A method for expressing various images by using data storage means corresponding to more than one kind of luminescent color for one kind of luminescent color will be described.

First, one method is to use data storage means corresponding to two or more types of luminescent colors for one type of luminescent color, and to multiply the luminescent color in multiple gradations. This is because multi-bit digital data is supplied as display data for each emission color, and gradation expression according to the data can be performed. In the present invention, in addition to this, surplus data is allocated and multi-gradation is performed. It is to be. That is, the third data storage means is provided so as to correspond to the other LED units in which the types of light emission colors constituting the pixel are small, and in an LED unit having more data storage means than the light emission color types, The display data stored therein is added to the data storage means to make the digital data further multi-bit, and the luminescent LED is turned on with gradation data based on the digital data. This method can be realized without requiring a significant design change in the control unit, and various LED units can be created by changing the setting.

Another method is to increase the number of dots in the display section by using data storage means corresponding to two or more types of luminescent colors for one type of luminescent color. This is because it is possible to display the display section of the LED array with a predetermined number of dots for each type of luminescent color constituting the pixel by the display data stored in each data storage means. By increasing the number of LED arrays having a predetermined number of dots that can be displayed by the storage unit, the number of dots in the entire display unit can be increased. That is, in a LED unit having a small number of types of luminescent colors forming pixels and provided with a third data storage unit so as to correspond to other LED units, and one type of LED unit having more data storage units than the types of luminescent colors, By using the LED array of a predetermined number of dots that can be displayed by the data storage means assigned to the light emission color as the minimum unit, and using the data storage means obtained by adding a surplus for each minimum unit according to the type of the light emission color. is there. Therefore, in an LED unit having a small number of types of luminescent colors constituting pixels, the data storage unit to which a surplus data storage unit is added corresponds to the type of the luminescent color for each display unit divided into the minimum units. Supply and display display data. The minimum unit is, for example, that the pixel is constituted by one kind of luminescent color and can be displayed by data storage means corresponding to one kind of luminescent color when the pixel has a display unit of 16 × 16 dots. For example, this 16 × 16 dot is the minimum unit. That is, the minimum number of dots that can be displayed by the data storage unit corresponding to each emission color is the minimum unit, and the surplus data storage unit added with the third data storage unit is further divided for each divided minimum unit. By associating each type of luminescent color, it is possible to display the entire display unit using a combination of minimum units.

In such a method, it is possible to simply increase the number of dots in the display unit and provide a data storage unit corresponding to the number of dots to achieve the same expression as the LED unit. Since the flow of the change and the processing of the display data in the control unit is greatly different, it is necessary to redesign from the beginning. In the present invention, since the number of dots in the display unit is increased by using the surplus data storage means, the number of dots is limited to the increase based on the minimum unit. Can be realized by using the conventional control unit without requiring the use of a conventional control unit, and the LED array of the display unit can be easily increased.

By combining these two methods, multiple gradations and an increase in the number of dots may be simultaneously performed for one kind of luminescent color, and each method may be applied to two or more kinds of luminescent colors. Needless to say, a combination thereof may be applied.

Here, the data storage means in the LED unit having a small number of emission colors is expressed by the presence or absence of correspondence to the emission color. This is because the display data necessary for displaying the LED array of the display unit emits light. This means that the data storage means 1 does not have to be clearly formed for each light-emitting color as shown in FIG. 1, and display data is supplied for each light-emitting color. Such a configuration is sufficient.

As described above, in the present invention, all of the stored display data is stored in the LED unit of the display unit by the LED unit.
In some cases, the method is not used for D light emission, but the method is not particularly limited in the present invention. As processing of display data not used for light emission of the LED, for example, a means for taking in data stored in the data storage means may be reduced, or a lighting output circuit for taking in the control unit and corresponding data may be connected to the display unit. There is no such method.

[0032]

Embodiments of the present invention will be described below with reference to the drawings. The following embodiments embody the technical idea of the present invention, and the present invention is not limited to these embodiments.

One of the LED dot matrix units constituting the LED display device has three pixels of red, green, and blue, each of which has one LED as one dot.
This LED unit is shown in FIG. 1 when it is arranged in 16 dots. As shown in FIG. 1, this LED unit has a shift register as data storage means. The shift register shifts the display data one bit at a time, and the display data input from the controller or the like is transferred to the shift register of each LED unit on the data bus. The display data is transferred to the shift registers of all the LED units, latched by the logic circuit shown in the drawing having a latch circuit, and each L of the display unit is
A display signal such as blinking data for causing the ED to emit light is sent to the lighting output circuit, and the lighting output circuit lights each LED.

Here, R, G, and B pixels of the display section are red,
Each of green and blue LEDs is used, and as shown in FIG. 1 as data storage means corresponding to each pixel,
A shift register for storing R, G, and B display data is provided.

In the example shown in the figure, since the LED unit is a 16 × 16 dot LED unit, the display data of the first to sixteenth columns of the LED array of the display unit stored in each of the RGB shift registers is controlled and controlled. Latched in the drive unit, the LED of the first row of the display unit is turned on. This operation is repeated at high speed up to the 16th line, and lighting of one frame of the display unit is performed. At this time, if the display data is an 8-bit digital signal, the RGB LEDs are turned on at 256 gradations,
The D unit can express 160,000 colors.

Hereinafter, an embodiment of a display device having the LED unit will be described. However, it is needless to say that the present invention does not need to have the LED unit, and any combination with another LED unit is possible. Nor.

Embodiment 1 A description will be given below of a case where the LED units constituting the display device are connected in a row of a multi-color, monochrome and multi-color unit as shown in FIG.

Two multi-color units 101 shown in FIG.
Are the same as those described above, and are pixels each using one light emitting element for each of the three types of emission colors R, G, and B,
The display unit 3 is a matrix display of 16 × 16 dots by using this as one dot. Monochrome unit 102
Is one type of luminescent color and one white light emitting LED as one pixel,
16 × 16 dots are arranged. Conventionally, in such a monochrome unit, since one pixel is composed of one kind of emission color and one LED, only one data storage means for transferring display data corresponding to this is required. It had one shift register.

Here, the LE of white light emission used in this embodiment was used.
Examples of the D (one chip) include an LED using a phosphor and an LED having a light emitting layer of a multiple quantum well structure (MQW). Specifically, as the LED using the phosphor, there is an LED in which a substance for converting the color of light emitted from the light emitting element is applied on a chip, or an LED in which a substance is mixed in a sealing agent. Also, MQW white LED
The light emitting layer has a multiple quantum well structure, and the light emitting layer has a short emission peak wavelength and a long emission peak wavelength. Specifically, the well layer of the multiple quantum well structure is InGaN, and this well layer has In
A first light-emitting layer having a high content, that is, a long emission peak wavelength, and a low In content (a short emission peak wavelength)
By having the second light emitting layer, an LED that emits white light as mixed color light is obtained. At this time, the first and second layers are preferably provided first on the p-type conductive layer side, and each layer may be composed of a plurality of layers. Further, the intensity ratio of each emission color can be controlled by the lamination ratio or the number of layers relating to each wavelength and / or the thickness of the barrier layer sandwiching the well layer. In this embodiment, a white LED of MQW is used as a monochrome (white) LED unit.

In the display device of this embodiment, the monochrome unit has three shift registers (1R, 1G, 1B) as data storage means, one of which is used. Uses the shift register 1W on the bus line to which the green display data is supplied in the multi-color unit, and the display data stored in the shift register 1W is sent to the control unit as shown by the arrow, and the white LED is turned on. 2 left in the monochrome unit
The (R, B) shift registers 1p1, 1p2, or the display data stored therein, are ignored without being used for lighting the LEDs of the display unit, and are ignored by the multi-color unit 101 downstream of the data line. Display data (R,
B) It serves as a route for delivering and receiving.

In the white unit, a control unit for a conventional white LED unit which handles one type of conventional white may be used as described above. The lighting output circuit used in the above may be connected to and connected to the display section of the white LED, and nothing may be connected to the output side of another output circuit. As another method, a method having a mechanism for discarding unnecessary display data in the control unit may be used.

In the LED display device thus obtained, monochrome and multi-color panels can be arbitrarily arranged, and can display various images. When assembling the LED units, it is sufficient to simply arrange the units and connect adjacent units with a cable as in the conventional case.

[Embodiment 2] Next, instead of the monochrome unit 102 of Embodiment 1, a two-color unit 103 shown in FIG.
Is sandwiched between multi-color units, and L
The ED display will be described. This two-color unit 10
Reference numeral 3 denotes a single pixel composed of one two-color LED (two kinds of emission colors) including a red LED chip and a blue-green LED chip as pixels, and is arranged in a 16 × 16 dot matrix. At this time, as the two-color LED, two LEs
D chip is die-bonded on a cup provided on the same lead (main lead), one electrode of each LED chip is connected, and the other electrode is connected to two sub-leads and sealed. Each LED chip is die-bonded to a separate lead cup, the other electrode of each LED is connected to another lead, and each chip is individually sealed with a resin mold so that a lens effect is imparted. Or an LED lamp mounted on a printed circuit board and integrally sealed with a resin mold. In this embodiment, as the emission colors of the two LED chips, when the color of each LED chip is represented by two points on a chromaticity diagram (for example, the XY color chromaticity diagram of CIE), the two points Are selected so that the straight line connecting the... Passes through the white area. In the red and green two-color LEDs, which are often seen today, the display of the color appears to the human eye as a monotonous orange-like color as a whole. However, since it is a two-color LED capable of expressing white as in this embodiment,
The emission colors are variously represented by intermediate colors including white.
In combination with B multi-color unit, LED
The entire display device does not have a monotonous color tone, and is compatible as a pseudo color. Others include a combination of yellow and blue.

LED having each unit in such an arrangement
In the display device, unlike the first embodiment, two shift registers are used for two kinds of emission colors constituting pixels by display data stored in two (1R, 1BG) of the three shift registers, and LEDs of the display unit are used. Light is emitted. In the figure, the shift registers (1) corresponding to the emission colors green and blue of the multi-color unit are shown.
R, 1BG) is used for red and blue-green light emission constituting a pixel. At this time, it is possible to arbitrarily set which data storage means is assigned to each of the luminescent colors constituting the pixel. Unused shift register 1P
Is used as a path for display data as in the first embodiment. As in the first embodiment, unnecessary display data is
Not used for LED light emission. As for the control unit, similarly to the first embodiment, the control unit used in the conventional two-color LED unit may be used, or the multi-color LED unit may be used.

Therefore, in the first and second embodiments, in the LED unit having a small number of luminescent colors, a data storage means (third data storage means) is newly added to compensate for the difference, or It can be almost realized only by changing the LED array of the display unit in the LED unit having many types. In other words, there is no need for major design changes, and most of them can be realized by using existing products, and it can flexibly respond to various LED display devices.
Can be designed.

[Embodiment 3] Further, as another embodiment of the present invention, in an LED display device having the same arrangement of LED units as in Embodiment 1 (FIG. 1), the display data is taken in the white unit. An LED display device as shown in FIG. 3 will be described. The display data sent to the multi-color unit is RGB
Shift registers (1R,
1G, 1B), digital data of 3 bits (8 gradations) is input, and a unit can display 512 gradations in three colors. The display unit 2 uses one light emitting element for each of RGB, and uses it as one dot.
This is a 6 × 16 dot matrix display. FIG.
In a monochrome unit (one dot is composed of one white LED and a pixel is composed of one kind of emission color), three shift registers (1W1, 1W) corresponding to RGB of a multi-color unit are used.
All the display data stored in W2, 1W3) is taken into the control unit 2, processed by the logic circuit in the control unit as 9-bit digital data for white, input to the lighting output circuit as a white signal, and output to the display unit 3. At 16 × 1
Gray scale display of 512 gradations with 6 dots becomes possible.

More specifically, the input display data is supplied to a lighting output circuit by a gradation control circuit or the like so that the gradation data portion emits light with a time width corresponding thereto, and the brightness of each luminescent color is adjusted. , Etc., so that gradation is expressed. In the above-mentioned white LED unit, display data corresponding to the three kinds of luminescent colors that have been captured is converted into one by the gradation control circuit or the like.
It is used for various emission colors (white) and is supplied to the lighting output circuit as multi-gradation gradation data, so that the matrix display of the display section can perform multi-gradation expression corresponding to three display data. In the embodiment, all the display data corresponding to the three emission colors are used. However, it is not always necessary to use all the display data, and two types may be used. That is, a display form combined with the first embodiment is also possible.
Specifically, a part of the surplus data storage means may be used for multi-gradation, and the rest may not be used for display.

[Fourth Embodiment] As another embodiment of the present invention, an LED display device having the same arrangement of LED units as in the second embodiment is described. An example of the embodiment as shown in FIG. 4 will be described below. Unlike the second embodiment, as shown in FIG. 4, all three shift registers (1R, 1BG1, 1BG2) of the two-color unit are assigned to two kinds of emission colors (one for red and two for blue-green). The display data stored in each shift register is fetched into the control unit 2, and the same processing as in the third embodiment is performed.
It becomes digital data of 64 bits gradation. That is, in the display unit, 8 gradations of red and 64 gradations of blue-green correspond to 16 gradations of 512 gradations.
It is a × 16 dot matrix unit.

In such a two-color unit, as described above, in the straight line connecting two points on the chromaticity diagram, the intermediate color between the blue-green and white regions is multi-grayed, and its expressiveness is increased. In addition, it can be applied to various uses.

As described above, LEDs having a small number of emission colors are used.
In the unit, a data storage means (third data storage means) provided so as to supplement the difference from other LED units to the data storage means corresponding to each emission color, and the display data thereof is used. Therefore, it is possible to easily perform multi-gradation with respect to at least one kind of emission color among a plurality of kinds. As a result, the obtained LED display device is excellent in gradation expression, and the range of applications is widened.

Embodiment 5 As another embodiment of the present invention, an LED display device having the LED unit shown in FIG. 5 instead of the white LED unit in Embodiment 1 will be described. FIG. 5 shows the LED units arranged in the same manner as in the first embodiment. However, the monochrome unit has an array of 16 × 48 dots as shown in FIG. As in the third embodiment, there are three shift registers (1W1, 1W2,
The display data stored in 1W3) is taken into the control unit 2, and the data corresponding to the three kinds of emission colors of RGB of the multi-color unit are W1 to W16, W17 to W32, and W33 of the display unit.
ＷW48, and each white LED is turned on.

At this time, the monochrome unit takes in data from three shift registers. However, even if the monochrome unit takes in display data from two of the three shift registers and turns on each LED of the 16 × 32 display unit. good. Also, in FIG. 5, the display unit is provided with each LED for easy understanding.
Although the array (16 × 16 dots) is arranged side by side at a distance, it is not necessary to be particularly limited to this figure.
The display may be a 6 × 48 (48 × 16) dot display, or may be arranged vertically.

That is, an LED unit having a large number of display dots can be easily formed only by using a combination of the above-described minimum unit number of dots for the display unit. Specifically, the white LED unit used in the present embodiment uses a multi-color portion for a portion other than the display portion, and replaces the display data allocated to each emission color with the display portion divided into the minimum unit. (A display unit having a predetermined number of dots) and the entire display unit is displayed. In the LED display device having such an LED unit, the number of dots can be increased only for the LED unit of a specific emission color type, so that the LED panel having a large area and a free display unit can be arranged, and the expression power can be increased. Rich LED display is the conventional L
It can be easily realized with the resources of the ED unit.

[Comparative Example 1] As shown in FIG. 6, when a multi-color and a white unit are mixed, the white unit is arranged so as to be located at the end with respect to the flow of the display data, and is immediately before. Are connected such that only the display data corresponding to B is input from the multi-color unit of. The display data is sent so as to correspond to it, and can be displayed.

However, in such a method, the position of a unit having a small number of pixels (white unit in this embodiment) is limited, and only one unit can be arranged.

Comparative Example 2 As shown in FIG. 7, different data transfer paths are prepared for each type of LED unit.
An apparently mixed LED display device was manufactured.

However, in such an LED display device,
Two or more routes are required, and the number of processes in the control unit that outputs display data increases. In addition, since the LED arrays appear to be seemingly mixed, the cables connecting each LED unit are inevitably long, making it difficult to operate at high frequencies to ensure data reliability. In addition, a space for the LED display device is required, and the volume of the LED display device is increased. In addition, the assembling work of the LED display device becomes complicated, and the installation cost increases as the display device becomes larger.

[0058]

According to the LED display device of the present invention, when different dot matrix units are mixed, two types of input lines are not required as in the prior art. Even in the case of a device, an LED display device can be manufactured by using the input circuit used for the multi-color unit as it is, without requiring a special input circuit side design for the device.
Further, in the conventional device, the length of the cable connecting the same type of units largely depends on the arrangement of each unit in the LED display device, and is longer than that of the LED display device including the same unit. For this reason, the reliability of the LED and the operation at a high frequency become impossible.
As long as the number of units constituting the display unit is the same, the length of the cable connecting them is the same, so operation under the same conditions as conventional LED display units consisting of a single unit is possible It became.

Further, in the LED display device of the present invention, compared with the conventional LED display device composed of different units,
The assembly work of each LED unit is easy and the conventional LE
By simply diverting the components of the D unit and the accumulated technology, an LED display device capable of various expressions can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a state in which LED units according to one embodiment of the present invention are arranged.

FIG. 2 is a block diagram of an LED unit according to one embodiment of the present invention.

FIG. 3 is a block diagram of an LED unit according to one embodiment of the present invention.

FIG. 4 is a block diagram of an LED unit according to one embodiment of the present invention.

FIG. 5 is a block diagram of an LED unit according to one embodiment of the present invention.

FIG. 6 is a block diagram showing an arrangement of LED units according to a conventional example.

FIG. 7 is a block diagram showing a configuration of an LED unit according to a conventional example.

FIG. 8 is a block diagram showing an LED display device.

[Explanation of symbols]

 1 shift register (data storage means) 2 control unit 3 display unit 4 data bus 100 LED unit 101 multi-color LED unit 102 .... White (monochrome) LED unit 103 .... 2-color LED unit

Claims (3)

[Claims] 1. A first display section in which pixels having a plurality of light emitting elements and emitting one or more kinds of emission colors are arranged in a matrix, and display data respectively corresponding to the emission colors are sequentially transferred and stored. A first data storage unit including at least a first data storage unit and a first control unit that controls lighting of each light emitting element based on display data stored in the first data storage unit;
And a second display unit in which the types of light emission colors are smaller than those of the first LED unit and pixels using each light emission color are arranged in a matrix, and a display corresponding to each of the light emission colors. A second data storage unit for sequentially transferring and storing data, and a second LED unit having a second control unit for controlling lighting of each light emitting element by display data stored in the second data storage unit. An LED display device, comprising: a data bus for causing common transfer of display data to respective data storage means of a first LED unit and a second LED unit; and wherein the second LED unit is provided. LE has a third data storage means provided corresponding to the first data storage means in addition to the second data storage means.
D display device. 2. In the second unit, at least one kind of luminescent color is multi-grayed by the stored display data using the third data storage means. The LED display device according to claim 1. 3. In the second unit, the second display section is divided into at least two or more sets, and the third data storage means is assigned to each of the divided sets. 4. The LED display device according to claim 2, wherein each set of LEDs of the display unit is turned on by the stored display data.