JPH1026942A - Led dot matrix display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the white balance of an LED display device uniform by using the LED dot matrix display system. SOLUTION: A three row and three column dot matrix grid is constituted of two red LEDs 41 and 42, three green LEDs 43, 44 and 45 and four blue LEDs 46, 47, 48 and 49. The differences among the light emitting efficiencies of individual three color LEDs are compensated for and uniform white balance is realized not only within the grid unit but also among the adjacent grids.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED used for white balance adjustment in an LED image display device.
Dot matrix display system (international patent classification G09)
F 9/33).

[0002]

2. Description of the Related Art In recent years, image display devices have become larger,
There is a tendency for higher definition. Therefore, even if the screen size increases, uniform white balance adjustment is required for various video sources, and therefore, a LED image display device is also required to have faithful color reproduction capability corresponding to each video source.

Conventionally, an LED dot matrix display system is disclosed in Japanese Patent Application Laid-Open No. 1-179913.

[0004] A conventional LED dot matrix display system will be described below. FIG. 7 shows the LED display arrangement of the conventional LED dot display system, FIG. 12 shows the structure of the conventional LED dot display system, and FIG. 13 shows the structure of the programmable constant voltage circuit 30 in FIG. It is shown.

[0005] In FIG. 7, in the conventional configuration, 1 is the L for red.
ED, 2 is a green LED, 3 is a blue LED, and 1
LED of red, green, and blue for grid
This is an LED display array having a structure in which colors are arranged one by one in an equilateral triangle. Two types of arrangement are implemented, one arrangement only and one arrangement combining two lattices.

In FIG. 13, reference numeral 15 denotes an analog signal of a red primary color video signal (hereinafter referred to as a red primary color signal) 11 based on a voltage (hereinafter referred to as a DC bias adjustment voltage) 14 for adjusting a DC bias of the video signal. A converter for converting an analog signal to a digital signal (hereinafter referred to as A / D) for converting a digital signal (hereinafter referred to as a red digital signal) 18 for controlling a red LED.
And a digital signal (hereinafter referred to as a green digital signal) for controlling a green LED based on a DC bias adjustment voltage 14 based on an analog signal of a green primary color video signal (hereinafter referred to as a green primary color signal) 12. A / D to convert to 19)
A converter 17 converts an analog signal of a blue primary color video signal (hereinafter referred to as blue primary color signal) 13 into a digital signal (hereinafter referred to as blue digital signal) 20 for controlling a blue LED based on the DC bias adjustment voltage 14. A / D converter, 21
Is the red digital signal 18, the green digital signal 1
9, an I / O port for outputting an I / O port output signal 22 based on the blue digital signal 20;
A CPU 26 outputs a CPU output signal 24 and an external control voltage 25 based on the port output signal 22. An output voltage 27 controls a red LED based on the CPU output 24, an output voltage 28 controls a green LED, This is an I / O port that outputs an output voltage 29 for controlling a blue LED. And 3
0 is the A / D converter 15, the A / D converter 16, the A / D
The converter 17, the I / O port 23, the CPU 23,
It is a programmable constant voltage circuit constituted by an / O port 26.

In FIG. 12, reference numeral 30 denotes a circuit for processing a signal output from the programmable constant voltage circuit shown in FIG.
A variable resistor that controls a current flowing through an assembly of red LEDs (hereinafter referred to as a group of red LEDs) 35 in the ED dot display system, and a variable resistor 32 of a green LED in the LED dot display system based on an output voltage 28 Assembly (hereinafter referred to as green LED
A variable resistor for controlling a current flowing through the LED group; a group of blue LEDs in the LED dot display system based on the output voltage;
Is a variable resistor for controlling the current flowing through
ED group 35, green LED group 36, blue LED group 37
Potentiometers that control the current flowing through all of them based on the external control voltage 25, and these programmable constant voltage circuits 3
0, variable resistor 31, variable resistor 32, variable resistor 33, potentiometer 34, red LED group 35, green LED
The group 36 and the blue LED group 37 constitute a conventional LED dot matrix display system.

The operation of the LED dot matrix display system configured as described above will be described with reference to FIGS.

FIG. 7A is an LED display arrangement diagram of a conventional LED dot display system, and FIG. 7B is a conventional LED dot display system.
FIG. 8 and FIG. 9 are LED display arrangement diagrams of an LED dot display system using two types of ED display arrangements.
L at adjacent part of the grid for explaining the operation of the dot display system
FIG. 10 is an ED display diagram, and FIG.
FIG. 12 is an LED display diagram of a portion adjacent to a grid for explaining the operation of an LED display system using various kinds. FIG. 12 is a functional block diagram of a conventional LED dot display system, and FIG. FIG. 3 is a functional block diagram of a voltage circuit 30.

Referring to FIG. 13, a red digital signal 18 is A / A based on a red primary color signal 11 and a DC bias adjustment voltage 14.
The green primary color signal 12 and the DC
The green digital signal 19 is generated by the A / D converter 16 based on the bias adjustment voltage 14, and the blue digital signal 20 is generated based on the blue primary color signal 13 and the DC bias adjustment voltage 14.
/ D converter 17. The red digital signal 1
8, an I / O port output signal 22 is created at the I / O port 21 based on the green digital signal 19 and the blue digital signal 20, and a CPU is generated based on the I / O port output signal 22.
At 23, an external control voltage 25 and a CPU output signal 24 are output.
, Output voltage 27, output voltage 28, and output voltage 29.

In FIG. 12, an output voltage 27, an output voltage 28, and an output voltage 28 are obtained based on the red primary color signal 11, the green primary color signal 12, the blue primary color signal 13, and the DC bias adjustment voltage 14 by the programmable constant voltage circuit 30 shown in FIG. An output voltage 29 is output, and a potentiometer 34 and a variable resistor 31 controlled by an external control voltage 25 based on the output voltage 27 control a current flowing to a red LED group 35 to control the red LED.
The brightness of the group 35 is adjusted, and similarly, the green LE is adjusted by the potentiometer 34 and the variable resistor 32 based on the output voltage 28.
By controlling the current flowing through the D group 36, the green LED group 36
The brightness of the blue LED group 37 is adjusted by controlling the current flowing to the blue LED group 37 with the potentiometer 34 and the variable resistor 33 based on the output voltage 29.
That is, the circuit shown in FIG.
0, variable resistor 31, variable resistor 32, variable resistor 33, potentiometer 34, red LED group 35, green LED
This is an LED dot display system that includes a group 36 and a blue LED group 37 and controls the white balance of one grid by adjusting the brightness of the LEDs of three colors.

[0012]

However, in the above-mentioned conventional configuration, as shown in FIGS. 8 and 9, there is a difference in the LED interval between the adjacent grids, so that the difference between the lightness and darkness in one grid unit in the entire screen. There is a problem that it occurs.

Further, in the case of two kinds of combination arrangements, as shown in FIG. 10 and FIG. 11, although the LED intervals between adjacent grids are equal in the vertical and horizontal directions, the vertical and horizontal directions are equal. Since there is a difference in the LED interval between them, there is a problem that a difference in lightness and darkness occurs in units of one grid over the entire screen.

In the above-described conventional configuration, the three-color LE is used.
D When adjusting the white balance in which the difference between the individual luminous efficiencies is corrected, since the white balance in the grid unit depends on the current flowing through one LED of each color per grid, the uniformity of the white balance in the entire screen is determined in grid units. There is a problem that it is difficult to adjust.

Further, the above-described conventional configuration has a problem that it is difficult to automatically correct a change in white balance due to a change in an input video source.

[0016]

In order to solve this problem, the present invention provides two red LEDs, three green LEDs, and a blue LED based on the relationship between the luminous efficiency and the color temperature of each of the three color LEDs.
By arranging four EDs in a three-row, three-column grid, the difference in the issuance efficiency of each LED of the three colors is corrected in one grid unit, and the LE for red is used not only in the grid unit but also between adjacent grids.
D, the ratio of the green LED and the blue LED is 2:
It has a configuration that can be maintained at 3: 4.

According to another aspect of the present invention, there is provided an LED display for controlling the brightness of each color LED by controlling a current flowing through each color LED group based on an input video signal. When the white balance is adjusted, the white balance is uniformly adjusted for each lattice.

In order to solve this problem, the present invention provides a switching signal for switching on and off the LEDs for each color in a grid based on the signal amplitude of each primary color signal input to a programmable constant voltage circuit. When the white balance of the LED display is adjusted to output a control signal that controls the current flowing to the LED, it follows the signal amplitude of the input video signal even if the input video source changes and the white balance changes Thus, a configuration that enables automatic white balance adjustment is provided.

The present invention solves the above-mentioned conventional problems. By correcting the difference in the issuance efficiency of each LED of three colors by the grid unit of the dot matrix of 3 rows and 3 columns, the present invention corrects not only the grid units but also the adjacent units. White balance can be realized even between adjacent gratings.

Further, according to this configuration, based on the input video signal, the current flowing through each color LED group arranged in three rows and three columns is controlled to adjust the brightness of each color LED group. Uniform adjustment of white balance can be realized for each lattice.

Further, according to this configuration, even if the input video source changes and the white balance changes, the white balance can be automatically adjusted by following the signal amplitude of the input video signal.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention described in claim 1 of the present invention comprises two red LEDs, three green LEDs, and a blue LE.
This is an LED dot matrix display system characterized in that a dot matrix lattice of three rows and three columns is configured using four D pixels.

The second aspect of the present invention provides a red LED 2
, A three-row, three-column dot matrix grid composed of three green LEDs and four blue LEDs, wherein three green LEDs are arranged diagonally, and the blue LEDs are 3. An LED dot matrix display system comprising four LEDs arranged at positions adjacent to two LEDs and two LEDs for red disposed at the remaining positions. The correction is performed in units of one grid, and in addition, the white balance is made uniform not only in the unit of grid but also between adjacent grids.

According to a third aspect of the present invention, there is provided the LED dot matrix display system according to the first or second aspect, wherein a signal amplitude of an input video signal is detected and a luminance of the LED group for each color is detected. Controlled, red LED, green L
LED dots having the function of correcting the difference between the luminous efficiencies of the ED and blue LEDs in units of one grid and realizing automatic white balance adjustment in grid units of three rows and three columns following the input amplitude level of the video signal. This is a matrix display system.

According to a fourth aspect of the present invention, there is provided the LED dot matrix display system according to the first or second aspect, wherein the CPU outputs a video amplitude output signal indicating an input amplitude of the input video signal, and A programmable constant voltage circuit including an LED control circuit for receiving a video amplitude output signal and outputting each color control signal, and a switching signal output circuit for receiving the video amplitude output signal and outputting a switching signal;
A current control circuit for controlling a current flowing to each color LED based on an output signal of the D control circuit; and a switching means for switching on and off of each color LED based on the switching signal.
ED dot matrix display system level, comprising a programmable constant voltage circuit that detects the amplitude level of the video signal and controls the luminance of each color LED group, even if the input video source changes and the white balance changes Has an effect of realizing automatic white balance adjustment following the signal amplitude of the input video signal.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. (Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an LED display array diagram of an LED dot matrix display system according to an embodiment of the present invention, and FIG. 2 is an LED display at an adjacent portion of a grid for explaining the operation of the LED dot matrix display system according to an embodiment of the present invention. FIG.

In FIG. 1, reference numeral 41 in the LED display arrangement diagram shown in FIG. 1 denotes an upper right red LED group of a 3-row, 3-column dot matrix grid, and similarly, a reference numeral 42 denotes a lower left red LED group of the grid.
3 is an upper left green LED group of the grid, 44 is a central green LED group of the grid, 45 is a lower right green LED group of the grid, 46 is an upper middle blue LED group of the grid, and 47 is a left middle blue LED of the grid. L
ED group, 48 is a lower middle blue LED group of the grid, and 49 is a right middle blue LED group of the grid.

The operation of the LED dot matrix display system configured as described above will be described with reference to FIGS. 1, 2 and 3.

In the LED display arrangement shown in FIG. 1, the LEDs of each color are arranged at equal intervals in the vertical and horizontal directions between all adjacent lattices in the dot matrix lattice of three rows and three columns as shown in FIG. The difference in lightness and darkness in the entire screen can be eliminated, and uniform white balance can be realized not only in grid units but also between adjacent grids.

Next, an operation example of the LED dot matrix display system of the present invention will be described with reference to FIG. FIG. 4 is a functional block diagram showing an LED dot matrix display system according to an embodiment of the present invention. FIG. 13 shows a structure of the programmable constant voltage circuit 30 in FIG. This is the same as the constant voltage circuit 30.

In FIG. 4, reference numeral 30 denotes a red primary color signal 11, a green primary color signal 12, a blue primary color signal 13, a DC bias adjustment voltage 1
4 is a programmable constant voltage circuit that outputs an external control voltage 25, an output voltage 27, an output voltage 28, and an output voltage 29 based on the external control voltage 25 output from the programmable constant voltage circuit 30. All L
Potentiometers for controlling the current flowing through the ED, 51, 5
2 is a red LED group, 53, 54 and 55 are green LEDs
Groups, 56, 57, 58, and 59 are blue LED groups, 31 is a variable resistor that controls current flowing through the red LED groups 51 and 52, and 32 is a current resistor that controls current flowing through the green LED groups 53, 54, and 55. A variable resistor 33 is the blue LED group 5
6, 57, 58, and 59 are variable resistors that control the current flowing through them.

The operation of the LED dot matrix display system configured as described above will be described with reference to FIGS.

In FIG. 13, the red digital signal 18 is converted to an A / A signal based on the red primary color signal 11 and the DC bias adjustment voltage 14.
The green primary color signal 12 and the DC
The green digital signal 19 is generated by the A / D converter 16 based on the bias adjustment voltage 14, and the blue digital signal 20 is generated based on the blue primary color signal 13 and the DC bias adjustment voltage 14.
/ D converter 17. The red digital signal 1
8, an I / O port output signal 22 is created at an I / O port 21 based on the green digital signal 19 and the blue digital signal 20, and the I / O port output signal 22 An output signal 24 is output, and the CPU output signal 24 becomes an output voltage 27, an output voltage 28, and an output voltage 29 via an I / O port 26.

In FIG. 4, an output voltage 27, an output voltage 28, and an output voltage 27 are obtained based on the red primary color signal 11, the green primary color signal 12, the blue primary color signal 13, and the DC bias adjustment voltage 14 by the programmable constant voltage circuit 30 shown in FIG. An output voltage 29 is output, and based on the output voltage 27, the external control voltage 25 is output.
Potentiometer 34 and variable resistor 31 controlled by
The brightness of the red LED groups 51 and 52 is adjusted by controlling the current flowing through the red LED groups 51 and 52, and similarly, the potentiometer 34 and the variable resistor 32 are The green LED groups 53 and 5
By controlling the current flowing through 4, 55, the green LED
The brightness of the groups 53, 54, and 55 is adjusted, and the current flowing to the blue LED groups 56, 57, 58, and 59 is controlled by the potentiometer 34 and the variable resistor 33 based on the output voltage 29, so that the blue By adjusting the brightness of the LED groups 56, 57, 58, and 59, it is possible to correct the difference in luminous efficiency of each LED of each color in units of grids, and to realize uniform white balance adjustment in grid units of 3 rows and 3 columns. It is an LED dot matrix display system which is a feature.

(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a functional block diagram showing an LED dot matrix display system according to one embodiment of the present invention, and FIG. 6 shows a structure of the programmable constant voltage circuit 65 in FIG.

In FIG. 6, reference numeral 15 denotes an analog signal of the red primary color signal 11 which is converted to a red L based on the DC bias adjustment voltage 14.
A / D for converting to red digital signal 18 for controlling ED
A converter 16 converts an analog signal of the green primary color signal 12 into a green digital signal 19 for controlling a green LED based on the DC bias adjustment voltage 14, and 17 converts an analog signal of the blue primary color signal 13. DC bias adjustment voltage 14
An A / D converter for converting a blue LED into a blue digital signal 20 for controlling a blue LED,
8, an I / O port for outputting an I / O port output signal 22 based on a green digital signal 19 and a blue digital signal 20, an output voltage 26 for controlling a red LED based on the CPU output 24; Output voltage 2 for controlling LED
8. I / O to output output voltage 29 for controlling blue LED
The O port has the same configuration as that of the programmable constant voltage circuit 30 shown in FIG.

13 differs from FIG. 13 in that the CPU outputs the CPU output signal 24, the external control voltage 25, and the video amplitude output signal 62 based on the I / O port output signal 22.
61, a red control signal 67 for controlling a current flowing to each color LED based on the CPU output 24, and a green control signal 6
8. An LED control signal output circuit 63 that outputs a blue control signal 69 and a switching signal output circuit 64 that outputs switching signals 71 to 76 for switching on / off of the LEDs for each color are used to realize automatic white balance adjustment. This is the point used. These control signals 67, 68, 69 and switching signal 71
A description of the operation using # 76 will be described below.

In FIG. 5, reference numeral 34 denotes a potentiometer for controlling the current flowing to all the LEDs in the circuit by the external control voltage 25 output from the programmable constant voltage circuit 65, 51 and 52 denote red LED groups, 53 and 54, respectively. ,
Reference numeral 55 denotes a green LED group, and reference numerals 56, 57, 58, and 59 denote blue LED groups, which have the same configuration as that of FIG.

4 is different from FIG. 4 in that each color LE is controlled based on the red control signal 67, green control signal 68 and blue control signal 69 output from the programmable constant voltage circuit 65.
Current control circuit 7 for controlling the current flowing through D groups 51-59
7, 78, 79 and the programmable constant voltage circuit 65
Switches 81 to 86 for switching on / off of the LED groups 51 to 59 for the respective colors based on the switching signals 71 to 76 output from the printer are used to realize automatic white balance adjustment.

The operation of the LED dot matrix display system configured as described above will be described with reference to FIGS.

In FIG. 6, a red digital signal 18 is A / D based on a red primary color signal 11 and a DC bias adjustment voltage 14.
Similarly, the green digital signal 19 is generated by the converter 15 based on the green primary color signal 12 and the DC bias adjustment voltage 14.
A / D converter 16 generates a blue digital signal 20 based on the blue primary color signal 13 and the DC bias adjustment voltage
The signal is generated by the converter 17 based on the red digital signal 18, the green digital signal 19, and the blue digital signal 20.
An I / O port output signal 22 is created at the I / O port 21, and an external control voltage 25, a CPU output signal 24, and a video amplitude output signal 62 are output from the CPU 61 based on the I / O port signal 22, The output signal 24 is I
Output voltage 27, output voltage 28,
The output voltage 29, the video amplitude output signal 62 becomes a red control signal 67, a green control signal 68, and a blue control signal 69 for controlling a current flowing through each LED group in the LED control signal output circuit 63. In the signal output circuit 64, there are provided switching signals 71 to 76 for switching on / off of the LED group for each color.

In FIG. 5, the red primary color signal 11 and the green primary color signal 1 are output by the programmable constant voltage circuit 65 shown in FIG.
2. External control voltage 25, output voltage 27, output voltage 28, output voltage 29, red control signal 67, green control signal 68, blue control signal 69, switching signal based on blue primary color signal 13 and DC bias adjustment voltage 14. 71 to 76 are output, and the red LED group 5 is controlled by a potentiometer 34 controlled by the external control voltage 25 based on the output voltage 27 and a current control circuit 77 controlled by the red control signal 67.
The red LED is controlled by controlling the current flowing through
The luminance of the groups 51 and 52 is adjusted, and the luminance of the red single color is adjusted by switching on / off of the red LED group 51 based on the switching signal 71. Similarly, the current flowing through the green LED groups 53, 54, and 55 is controlled by the potentiometer 34 and the current control circuit 78 controlled by the green control signal 68 based on the output voltage 28, thereby controlling the green color. Of the green LED group 5 based on the switching signals 72 and 73.
The brightness of the monochromatic green color is adjusted by switching on and off of the light sources 3 and 54. A current control circuit 79 controlled by the potentiometer 34 and the blue control signal 69 based on the output voltage 29 causes the blue LED groups 56, 5
The brightness of the blue LED groups 56, 57, 58, 59 is adjusted by controlling the currents flowing through the blue LED groups 5, 58, 59 based on the switching signals 74, 75, 76.
The brightness of the monochromatic blue color is adjusted by switching on / off of 6, 57 and 58.

Accordingly, the configuration diagram shown in FIG. 5 includes a programmable constant voltage circuit 65, a potentiometer 34, current control circuits 77, 78, 79, red LED groups 51, 52, green LED groups 53, 54, 55, and blue LED group 56, 5
7, 58, 59, and switches 81 to 86. Even if the input video source changes and the white balance changes,
An LED dot matrix display system that realizes automatic adjustment of white balance by following the signal amplitude of an input video signal.

In the above description, an example in which the large-sized LED dot display is constituted by an LED dot matrix display system has been described. Can be similarly implemented.

[0045]

As described above, according to the present invention, two LEDs for red, three LEDs for green, and four LEDs for blue are arranged in a dot matrix of three rows and three columns per grid, so that LEDs of three colors are individually provided. Since the difference in issuance efficiency is corrected in units of lattices, an advantageous effect that uniformization of white balance can be realized not only in lattice units but also between adjacent lattices is obtained.

As described above, according to the present invention, the brightness adjustment of each color LED group is performed by controlling the current flowing through each color LED group arranged in 3 rows and 3 columns based on the input video signal. Is performed, there is an advantageous effect that uniform adjustment of white balance can be realized for each lattice.

As described above, according to the present invention, even when the input video source changes and the white balance changes, the white balance can be automatically adjusted by following the signal amplitude of the input video signal. The advantageous effect that it can be obtained is obtained.

[Brief description of the drawings]

FIG. 1 is an LED display array diagram of an LED dot matrix display system according to an embodiment of the present invention.

FIG. 2A is an LED display diagram for explaining the operation of the LED dot matrix display system according to one embodiment of the present invention; FIG. 2B is a diagram illustrating the operation of the LED dot matrix display system according to one embodiment of the present invention; LED display at the diagonal side of the grid

FIG. 3 (a) is an LED display diagram of an adjacent portion on the right side of the grid for explaining the operation of the LED dot matrix display system according to one embodiment of the present invention. (B) An LED dot matrix display system according to one embodiment of the present invention. (C) LED display on the upper side of the grid for explaining the operation of the LED dot matrix display system according to one embodiment of the present invention. LED display diagram of the lower part adjacent to the lattice for explaining the operation of the LED dot matrix display system according to one embodiment

FIG. 4 is a functional block diagram showing an LED dot matrix display system according to an embodiment of the present invention.

FIG. 5 is a functional block diagram showing an LED dot matrix display system according to an embodiment of the present invention.

FIG. 6 is a functional block diagram of a programmable constant voltage circuit in the LED dot matrix display system according to one embodiment of the present invention.

FIG. 7 (a) LE of a conventional LED dot display system
D display arrangement diagram (b) LED display arrangement diagram of an LED dot display system using two types of conventional LED display arrangements

FIG. 8A is an LED display diagram for explaining the operation of the conventional LED dot display system. FIG. 8B is an LED display diagram of an adjacent portion on the oblique side of the grid for explaining the operation of the conventional LED dot display system.

9A is an LED display diagram on the right side of the grid for explaining the operation of the conventional LED dot display system. FIG. 9B is an LED display diagram on the left side of the grid for explaining the operation of the conventional LED dot display system. ) LED display diagram of the upper and lower sides adjacent to the grid for explaining the operation of the conventional LED dot display system

FIG. 10: LED using two types of conventional LED display arrangements
LED display diagram for explaining the operation of the dot display system

FIG. 11 shows an LED using two types of conventional LED display arrangements.
LED display diagram on the left side of the grid for explaining the operation of the dot display system

FIG. 12 is a functional block diagram of a conventional LED dot display system.

FIG. 13 is a functional block diagram of a programmable constant voltage circuit in a conventional LED dot display system.

[Explanation of symbols]

 1, 41, 42 Red LED 2, 43, 44, 45 Green LED 3, 46, 47, 48, 49 Blue LED 11 Red primary color signal 12 Green primary color signal 13 Blue primary color signal 14 DC bias adjustment voltage 15, 16 , 17 A / D converter 18 Red digital signal 19 Green digital signal 20 Blue digital signal 21, 26 I / O port 22 I / O port output signal 23, 61 CPU 24 CPU output signal 25 External control signal 27, 28, 29 Output voltage 30 Programmable constant voltage circuit 31, 32, 33 Variable resistor 34 Potentiometer 35, 51, 52 Red LED group 36, 53, 54, 55 Green LED group 37, 56, 57, 58, 59 Blue LED group 62 Video amplitude output signal 63 LED control signal output circuit 64 Switching signal output circuit 65 Programmer Constant voltage circuit 67 red LED control signal 68 green LED control signal 69 blue LED control signal 71, 72, 73, 74, 75, 76 switching signal 77, 78, 79 current control circuit 81, 82, 83, 84, 85, 86 switch

Claims (4)

[Claims] 1. Two LEDs for red, three LEDs for green,
An LED dot matrix display system comprising a three-row, three-column dot matrix lattice using four blue LEDs. 2. Two LEDs for red, three LEDs for green,
A three-row, three-column dot matrix lattice formed by using four blue LEDs, wherein three green LEDs are arranged diagonally, and the blue LED is positioned adjacent to two green LEDs. Arrange 4 LEDs, red LED on the remaining position
An LED dot matrix display system, wherein two LED dots are arranged. 3. The LED according to claim 1 or claim 2.
A dot matrix display system that detects the signal amplitude of an input video signal, controls the luminance of each color LED group, and determines the difference in luminous efficiency between the red, green, and blue LEDs by one grid. An LED dot matrix display system, wherein the white balance is corrected in units and the white balance is automatically adjusted in grid units of 3 rows and 3 columns following the input amplitude level of the video signal. 4. The LED according to claim 1 or claim 2.
A dot matrix display system which outputs a video amplitude output signal indicating an input amplitude of an input video signal
A programmable constant voltage circuit including a PU, an LED control circuit that receives the video amplitude output signal and outputs each color control signal, a switching signal output circuit that receives the video amplitude output signal and outputs a switching signal, and the LED control circuit A current control circuit for controlling a current flowing to each color LED based on the output signal of the above, and switching means for switching on and off of each color LED based on the switching signal.
Dot matrix display system.