JP3060798B2 - LED information display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED information display device which is installed in an office or a street and displays various information by LEDs.

[0002]

2. Description of the Related Art An LED information display device includes a plurality of LEDs.
It consists of an LED information board with elements arranged vertically and horizontally,
FIG. 5 shows the configuration of such a conventional LED information display device. In the figure, reference numeral 31 denotes a display data storage unit for storing contents to be displayed on the LED information board, and a display data reading unit 32 sequentially reads data stored therein. The 33 LED lighting control unit turns on the 34 LED display units according to the data sent from the display data reading unit 32.

FIG. 6 shows the timing of the lighting operation of the conventional LED information display device.

The operation of the conventional LED information display device will be described below. In FIG. 5, a display data reading unit 32 reads data for the leftmost LED element from a display data storage unit 31 storing the content to be displayed on the LED display unit 34 for each LED element, and performs LED lighting control. The unit 33 turns on the leftmost LED element of the LED display unit 34 for a predetermined time when the transmitted data is data for turning on the LED element.

If the transmitted data is not data for turning on the LED, the leftmost LED element of the LED display section 34 is kept turned off. Next, data for the second LED element from the left is sent from the display data storage unit 32 to the LED lighting control unit 33 by the display data reading unit 32, and lighting or extinguishing is performed.

In the same manner, the operation is sequentially performed up to the rightmost LED element, and the above operation is repeated by returning to the leftmost LED element. FIG. 6 shows the lighting timing. The figure shows the lighting state of each LED element when all the LED elements are turned on. The LED elements are turned on only while the line is rising, and are turned off at other times. .

As described above, in the LED display section 34, not all the LED elements are turned on at once, but are turned on sequentially for a short time. By repeating this sequential lighting operation at a high speed, it is possible for the human eye to make the LED seem to be constantly lit. Thus, LE
By dynamically lighting the D element, the number of data lines, power consumption, and the like are suppressed.

[0008] Here, the brightness of the LED element can be adjusted by the lighting time at one time, and the LED lighting control unit 33 controls this. That is, by increasing the lighting time of the LED element, the LED element can be made brighter, and by decreasing the lighting time, the LED element can be made to glow darker.

[0009]

However, in the above-mentioned conventional LED information display device, the lighting time of the entire LED element is uniformly adjusted, so that each LED
Cannot be set individually, and therefore each L
There has been a problem that it is not possible to solve the unevenness in luminance that occurs due to the variation in the light emission characteristics of each ED element.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide an LE having a high luminous efficiency.
It is an object of the present invention to provide an LED information display device having no luminance unevenness by reducing the brightness by reducing the number of times of lighting of the D element and reducing the difference in brightness from the LED element having low luminous efficiency.

Another object is to provide a function of changing the brightness by thinning out the number of times of lighting of the LED element and a function of a clock so that the display can be performed with the brightness according to time.
An object of the present invention is to provide an ED information display device.

Still another object is to provide a function of changing brightness by thinning out the number of times of lighting of the LED element and a function of judging ambient brightness to perform display with brightness according to ambient brightness. It is an object of the present invention to provide an LED information display device which can perform the above.

[0013]

According to the present invention, there is provided an LED comprising an array of a plurality of LED elements.
A display unit for storing contents to be displayed on the LED display unit;
A lighting data storage unit and a circuit for turning on and off the LED elements.
A period monitoring unit for providing period data which is a period, and the LED
Brightness, which is information on the lighting efficiency of each LED element in the display unit
To store the number of required cycles in the bit format
Degree deterioration information storage unit, the lighting data storage unit and the brightness
Read out the deterioration information storage part and create display data
A correction data generating unit for receiving the correction data from the correction data generating unit.
Given from the display data taken and from the cycle monitoring unit
Thinning out the display timing according to the cycle data
A thinning-out gradation control unit for creating data, and based on the information read from the luminance deterioration information storage unit, the brightness of the LED element having high luminous efficiency is suppressed by decimating the number of times of lighting, thereby reducing the luminous efficiency. It is characterized in that a difference in brightness from a low LED element is reduced.

Further, in order to achieve the above object, the present invention has a function of changing brightness by thinning out the number of times of lighting of the LED element and a function of a clock, and displaying at a brightness according to time. And

Further, in order to achieve the above object, the present invention has a function of changing the brightness by thinning out the number of lighting of the LED element and a function of judging the surrounding brightness, and the brightness according to the surrounding brightness is provided. It is characterized in that the display is performed as described above.

[0016]

The brightness is suppressed by thinning out the number of lightings of the LED element with high luminous efficiency based on the information read from the luminance deterioration information storage unit. As a result, the difference in brightness from the LED element with low luminous efficiency is reduced. This reduces luminance unevenness.

Further, by reducing the number of lighting of the LED elements according to time, display with brightness according to time is realized.

Further, since the number of times of lighting of the LED element is thinned out according to the surrounding brightness, display with brightness corresponding to the surrounding brightness is realized.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the LED information display device according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the configuration of the first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a lighting data storage unit that stores contents to be displayed on an LED information board, and 7 denotes a luminance deterioration information storage unit that stores luminance deterioration information of a display unit. The second correction data generator reads out the data in the lighting data storage 1 and the luminance deterioration information storage 7, and generates display data.

The thinning-out gradation control section 3 creates thinning-out data of display timing in accordance with the display data received from the correction data creating section 2 and the cycle data given from the cycle monitoring section 4. This thinning data is 5 LEDs
It is sent to the lighting control unit and used to light up the six LED display units.

FIG. 2 shows the concept of the lighting operation of the first embodiment. The operation of the first embodiment will be described with reference to FIG.
Is stored as to whether or not to turn on each LED element. Further, in the luminance deterioration information storage unit 7, information on the lighting efficiency of each LED element of the LED display unit 6 is stored in a format expressed by 2 bits.

[0023] Even when the LEDs emit light under the same lighting conditions, the brightness varies depending on the performance variation and deterioration state of the LED elements. This information is stored in the luminance deterioration information storage unit 7, and the information on each LED element indicates the lighting efficiency of the corresponding LED element in three states as shown in Table 1. They are shown separately.

[0024]

[Table 1]

First, the correction data creation unit 2 sets the leftmost LE
Data corresponding to the D element is read from the lighting data storage unit 1 and the luminance deterioration information storage unit 7. If the data read from the lighting data storage unit 1 is data that does not turn on the LED element, 00 is displayed, and if the data is data that turns on the LED element, the data read from the luminance deterioration information storage unit 7 is displayed as it is. The data is sent to the thinning-out gradation control unit 3 as data.

Next, after reading the data for the second LED element from the left, and performing the same processing,
This is sent to the thinning-out gradation control unit 3. In the same manner as described above, the data for the rightmost LED element is sequentially reduced to the thinning gradation control unit 3.
Sent to Then, the operation returns to the transfer of data to the leftmost LED element, and the operation is repeated.

The cycle monitoring unit 4 regards the processing performed by the thinning gradation control unit 3 from the processing of data for the leftmost LED element to the processing of data for the rightmost LED element as one cycle. The fourth cycle is recognized, such as the first cycle of the second cycle, the second cycle of the second cycle, and so on. The fifth cycle is recognized as the first cycle, and in the same manner, the thinning tone control section 3 determines which of the first to fourth cycles the current processing performed by the thinning tone control section 3 corresponds to. Inform.

The thinning gradation control section 3 creates thinning data in accordance with the display data sent from the display data reading section 2 and the cycle data sent from the cycle monitoring section 4.

[0029]

[Table 2]

As shown in Table 2, in the first and second cycles, data for turning on the LED elements is generated for display data other than 00. In the third cycle, 1
Data for turning on the LED element is created for the display data of 0 and 11, and data for lighting the LED element is created for only the display data of 11 in the fourth cycle.

These data are sent to the LED lighting control unit 5, and when the sent data is data for lighting the LED elements, the corresponding LE of the LED display unit 6
The D element is turned on for a certain period of time. The sent data is L
If the data is not data for turning on the ED element, the corresponding LED element of the LED display unit 6 is kept turned off.

FIG. 2 shows the timing of the lighting operation. The leftmost and rightmost LED elements have a luminous efficiency of 50% of the standard, the second LED element from the left has a luminous efficiency of 67% of the standard, and the third LED element from the left has a luminous efficiency of the standard. The LED emits light at a standard brightness, and these LED elements are turned on.
The ED element indicates the lighting state of each LED element when not lighting, and the LED element is lit when the line goes up.

By repeating such dynamic lighting at a high speed, it is possible for the human eye to make the LED element seem to be constantly lit. In addition, the number of times of the dynamic lighting is thinned out as in thinning C in FIG. 2 so that the light amount is adjusted, and as a result, it can be seen that the lighting is performed with the same brightness.

As described above, according to the first embodiment, 5
An LED element with a luminous efficiency of 0% has 100% lighting times,
A 67% cool LED device has 75% lighting times,
By lighting an LED element having a luminous efficiency of 50% at a lighting frequency of 100%, it is possible to make each LED element seem to emit light with almost the same brightness, and to reduce unevenness in luminance on a display surface. it can.

In the first embodiment, the luminous efficiency information stored in the luminance deterioration information storage unit 7 is represented by 2 bits for each LED, and the thinning control is performed according to four cycles. However, the number of bits of information regarding the luminous efficiency and the number of cycles necessary for thinning-out gradation control may be increased or decreased according to the use situation. When the number of information bits is increased, the luminance can be controlled in multiple stages, and more detailed measures for luminance unevenness can be taken.

FIG. 3 shows the configuration of the second embodiment of the present invention. The second embodiment will be described with reference to FIG.
Reference numeral 11 denotes a lighting data storage unit for storing the content to be displayed on the LED information board, and a lighting data reading unit 12 sequentially reads the data stored therein. The clock function unit 17 monitors the time, and the luminance determination unit 18 controls the LE according to the time information given from the clock function unit 17.
The emission luminance of D is determined.

The thinning-out gradation control unit 13 converts the display timing thinning-out data according to the data received from the lighting data reading unit 12, the cycle information given from the cycle monitoring unit 14, and the information given from the luminance determining unit 18. create. This data is sent to the 15 LED lighting control units, and is used to light up the 16 LED display units.

Next, the operation of the second embodiment will be described. The lighting data storage unit 11 stores data on whether to turn on each LED element of the LED display unit 16.

First, the lighting data reading unit 12 stores data corresponding to the leftmost LED element in the lighting data storage unit 11.
And sends it to the thinning-out gradation control unit 13. Next, data for the second LED element from the left is sent, and so on until the data corresponding to the rightmost LED element is sent to the thinning gradation control unit 13 in the same manner. Thereafter, the operation is repeated by returning to the transfer of data corresponding to the leftmost LED element.

In the cycle monitoring section 14, the thinning gradation control section 1
Regarding the processing performed in step 3, the processing from the data processing for the leftmost LED element to the data processing for the rightmost LED element is regarded as one cycle, and the first cycle is defined as the first cycle, and the second cycle is defined as the first cycle. Recognize as two cycles. 3
The second cycle is recognized as the first cycle, and similarly, the thinning-out gradation control unit 13 is notified of which of the first and second periods the current processing performed by the thinning-out gradation control unit 13 corresponds to. .

The clock function unit 17 monitors the time, and notifies the luminance determination unit 18 of the time. Brightness determination unit 18
Means that the LED element is turned on at 100% brightness between 6:00 and 18:00, and LE at 50% brightness between 18:00 and 6:00
Instruct the thinning-out gradation control unit 13 to turn on the D element.

When the luminance determining unit 18 instructs to turn on the light at 100% brightness, the thinning gradation control unit 13
Sends the data provided from the display data reading unit 12 to the LED lighting control unit 15 irrespective of the cycle notified from the cycle monitoring unit 24.

On the other hand, when there is an instruction to turn on the display at 50% brightness from the luminance determining unit 18, in the first cycle, the data provided from the display data reading unit 12 is sent to the LED lighting control unit 15 as it is, LED for 2 cycles
Send data that does not turn on the element. As described above, the gradation control unit 13 creates thinned data according to the cycle notified from the cycle monitoring unit 14 and sends the thinned data to the LED lighting control unit 15.

If the data sent to the LED lighting control unit 15 is data for lighting the LED element,
The corresponding LED element of the ED display unit 16 is turned on for a certain period of time. If the transmitted data is not the data for turning on the LED element, the corresponding L
The ED element is left unlit.

As described above, according to the second embodiment, the display can be performed with the brightness corresponding to the time by thinning out the number of lighting of the LED according to the time.

In the above-described second embodiment, the number of periods required for the thinning-out gradation control unit is set to two, and control is performed so as to emit light at 50% or 100% depending on time. However, it is also possible to increase the number of periods necessary for thinning gradation control. In this case, by omitting the lighting of two cycles out of three cycles, or by thinning one cycle, 100
Further light emission control can be performed so that the light can be emitted at the brightness of%, 67%, and 33%.

Further, the lighting brightness depending on the time period can be arbitrarily set. Next, a third embodiment of the present invention will be described with reference to FIG.

FIG. 4 shows the configuration of a third embodiment of the present invention. In FIG. 4, reference numeral 21 denotes a lighting data storage unit, 22 denotes a lighting data reading unit, 23 denotes a thinning gradation control unit,
Cycle monitoring unit, 25 LED lighting control units, 26 LEDs
The display units are respectively the lighting data storage units 1 of the second embodiment.
1, lighting data reading unit 12, thinning gradation control unit 1
3. Since they are the same as the cycle monitoring unit 14, the LED lighting control unit 15, and the LED display unit 16, the description will be omitted.

The illuminance detector 27 has a function of monitoring the surrounding brightness, and measures the surrounding brightness using an optical sensor or the like. The luminance determining unit 28 determines the light emission luminance of the LED element according to the measured value.

Next, the operation of the third embodiment will be described. Operations other than the illuminance detection unit 27 and the luminance determination unit 28 are the same as those in the second embodiment.
The description is omitted because it is the same as that of the embodiment.

The illuminance detector 27 measures the surrounding brightness,
The measured value is input to the luminance determination unit 28. Brightness determination unit 2
8 indicates that the surrounding brightness is 20 based on the input measurement value.
The thinning-out gradation control unit 23 instructs the thinning-out gradation control unit 23 to turn on the LED elements at 100% brightness when the brightness is 00 lux or more and to turn on the LED elements at 50% brightness when the surrounding brightness is less than 2000 lux. To instruct.

As described above, according to the third embodiment, by reducing the number of times the LED elements are turned on in accordance with the surrounding brightness, it is possible to perform display with brightness corresponding to the surrounding brightness.

In the third embodiment, the number of periods necessary for thinning-out gradation control is set to two, and control is performed so as to emit light at 50% or 100% in accordance with the surrounding brightness. However, it is also possible to increase the number of periods necessary for thinning gradation control. In this case, by omitting the lighting of two cycles out of three cycles, or by thinning one cycle, 100
Finer light emission control can be performed so that the light can be illuminated with the brightness of%, 67%, and 33%.

That is, the LED information display device of the present invention has a configuration in which the number of gradation control cycles can be arbitrarily set, so that the lighting brightness can be set arbitrarily with respect to the ambient brightness. Things.

The above embodiment is merely an example embodying the present invention, and the configuration, data formation and processing method are not limited to the above embodiment. That is, a wide range of modifications are permitted within the gist of the present invention.

[0056]

As described above, the present invention suppresses the brightness by thinning out the number of lightings of the LED element with high luminous efficiency and reduces the difference in brightness from the LED element with low luminous efficiency by The effect of eliminating unevenness in luminance between LED elements can be realized.

Further, by thinning out the number of times the LED elements are turned on in accordance with time, a function of performing display with brightness in accordance with time is realized.

Further, by thinning out the number of times the LED elements are turned on in accordance with the surrounding brightness, it is possible to realize a function of performing display with brightness corresponding to the surrounding brightness.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an LED information display device according to a first embodiment of the present invention.

FIG. 2 is a timing chart of an LED element lighting operation of the LED information display device according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of an LED information display device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of an LED information display device according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional LED information display device.

FIG. 6 is a timing chart of an LED lighting operation of the conventional LED information display device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lighting data storage unit 2 correction data creation unit 3 thinning gradation control unit 4 cycle monitoring unit 5 LED lighting control unit 6 LED display unit 7 luminance deterioration information storage unit C thinning 11 lighting data storage unit 12 lighting data reading unit 13 thinning floor Key control unit 14 Cycle monitoring unit 15 LED lighting control unit 16 LED display unit 17 Clock function unit 18 Brightness determining unit 21 Lighting data storage unit 22 Lighting data reading unit 23 Thinning gradation control unit 24 Cycle monitoring unit 25 LED lighting control unit 26 LED display unit 27 Illuminance detection unit 28 Brightness determination unit 31 Display data storage unit 32 Display data reading unit 33 LED lighting control unit 34 LED display unit

Continuation of front page (56) References JP-A-7-28427 (JP, A) JP-A-63-104095 (JP, A) JP-A-62-1121492 (JP, A) JP-A-59-181880 (JP) , A) Practical application No. 2-91033 (U.S. Pat. No. 4,485,832) Microfilm photographing the contents of the specification and drawings attached to the application form (JP, U) Practical application No. 63-75957 (U.S. Pat. Microfilm (JP, U) photographing the specification attached to the application and the drawings attached to the application form (Japanese Patent Application No. Hei 1-181091) Japanese Patent Application No. 1-1147106 (Japanese Utility Model Application Publication No. 3-86393) And microfilms of the contents of drawings (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09G 3/14

Claims (3)

(57) [Claims] 1. An LE comprising an array of a plurality of LED elements
D display unit and the contents to be displayed on the LED display unit are stored.
A lighting data storage unit, for turning on and off the LED elements.
A period monitoring unit for providing period data which is a period;
It is information on the lighting efficiency of each LED element of the D display unit.
Stores the luminance deterioration information in the required number of cycles in bit format
A brightness deterioration information storage unit, the lighting data storage unit, and the brightness
Reads the data of the deterioration information storage and creates display data
A correction data generating unit for performing
Given from the displayed data and the cycle monitor,
Display timing thinning according to the periodic data
An LED information display device comprising a thinning-out gradation control unit for creating data . 2. The LED information display device according to claim 1 , further comprising a function of changing brightness by thinning out the number of times of lighting of said LED element and a function of a clock, and displaying at a brightness according to time. Wherein a function for determining the ambient brightness function and changing the brightness by thinning out the number of lighting times of the LED elements, the display is performed in brightness according to the ambient brightness 請
The LED information display device according to claim 1.