JPH07129100A - Assembled lamp panel module - Google Patents

Abstract

PURPOSE:To provide a color LED assembled lamp panel facilitating a brightness adjustment. CONSTITUTION:An (a) is the example of the circuit of assembled lamps and shows a case that one pixel 10 is constituted by using four blue LEDs, three green LEDs and two red LEDs. Four blue LEDs are made to be an independent circuit so as to be enargized differently from other LEDs and green and red LEDs are made to be an anode-common circuit. LEDs are arranged into a matrix as shown in a (b). The color-mixture of colors is performed adequatly with this arrangement. A module is made by constituting a panel while arranging every 16 pixels of pixel 10 in longitudinal and lateral directions. A driving control circuit for the blue LEDs is constituted of a constant current driver because a control by a current value is convenient to control the brightness of a sutle blue color independently of other colors. Further, the control by the current value improves the quality of a product because the variation of brightness due to lots of blue LEDs can be adjusted and absorbed by the control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly to a color collective lamp panel module using an RGB collective lamp using LEDs.

[0002]

2. Description of the Related Art Conventionally, in the LED of the display panel using the collective lamp of color, the blue LED is the current technology, and the blue LED alone can perform only the dark display. Often composed of green or yellow LEDs, in these pixels the LEDs were circuited with a common anode or cathode. Red and green,
The yellow LED operates at approximately the same forward voltage, so the blue LED
Another circuit was needed for the LED to be introduced.

[0003]

[Problems to be Solved by the Invention] However, the blue LE
D is the current technology that has a higher forward voltage when lit than other LEDs, and when configured with a common anode or cathode, the voltage needed to control another red or green LED is a blue LED. A lower voltage is required, and conversely, a higher voltage is applied to bring the blue LED to the target brightness. Therefore, if you try to display blue, the red or green
Since a lot of current flows to the LED, there is a problem that it is difficult to adjust the brightness.

Therefore, an object of the present invention is to consider that the display is handled only on a large scale, and assumes a large display which is sufficiently bright from a distance and is capable of sufficiently recognizing colors.
It is to provide an LED display device with RGB collective lamps.

[0005]

In order to solve the above-mentioned problems, the structure of the present invention has a structure in which a plurality of LEDs of the three primary colors of red, green and blue are used to form one pixel, and a plurality of the pixels are arranged to form a color. In the collective lamp panel module to be displayed, the red and green LEDs have an anode or cathode common circuit, and the blue LED has an independent circuit configuration. According to another aspect of the invention, in a collective lamp panel module in which a plurality of LEDs of the three primary colors of red, green and blue are used to form one pixel and the pixels are arranged in a color display, the dimming circuit controls each color LED. It is to have a frequency control means of the dimming circuit which is provided in the circuit and adjusts the brightness independently of each color. The configurations of the related inventions of both inventions are characterized in that, among the LEDs of the three primary colors, the number of blue LEDs is four, the number of red LEDs is two, and the number of green LEDs is three.

[0006]

[Function] Since the blue LED has a circuit structure independent from the others, it can emit light independently of other colors. The low brightness blue LED also allows independent brightness adjustment for the same reason.

[0007]

EFFECTS OF THE INVENTION Since the LED is a three-primary-color LED collective lamp, it is possible to surely achieve desirable color expression on a bright LED full-color display panel. In addition, since an independent dimming circuit is used for each color, fine control of color mixing is possible and adjustment is easy.

[0008]

EXAMPLES The present invention will be described below based on specific examples. FIG. 1 (a) is an example of the circuit of the collective lamp according to the present invention. In the case where one pixel 10 is constructed by using four blue LEDs, three green LEDs and two red LEDs, Show the wiring. The four blue LEDs are independent circuits that energize separately from the other LEDs. The green and red LEDs are as common anode. These LEDs are arranged in a matrix as shown in Fig. 1 (b). By arranging in this way, the color mixing of each color is carried out moderately. One pixel 10 becomes one dot, and each pixel is arranged in 16 dots in the vertical and horizontal directions to form the display panel shown in FIG.

The module 20 has a structure as shown in the side sectional view of FIG.
0 and the LED driver board 24 arranged behind it are connected by a connector 22. As shown in FIG. 1 (a), since the number of terminals of one pixel 10 is 5, the number of terminals is one, and one driver board 24 can be connected to 16 pixels in one row.
The driver board may have a 16-stage configuration. Reference numeral 26 in FIG. 3 is a control board on which an input / output buffer and the like are mounted, and is connected to an external signal or the like by a connector 28.

The modules 20 are connected and arranged in series as shown in the circuit of FIG. 4, and lighting is controlled from the outside through the interface circuit 31 to perform color display. Each module 20 has a pixel 1 of the collective lamp
A lighting control circuit board (not shown) for controlling lighting of 0 is attached, and a display code corresponding to a dot pattern to be displayed on these lighting control circuits is sent as a serial signal to each module in synchronization with a shift clock. .
Serial data is sequentially shifted in the order of module numbers, fixed by a latch signal, and displayed on the panel. In Fig. 4, V1 is the red and green LED power supply, V2 is the blue LED power supply,
GND1 is the ground of the IC used in each module, GND2
Is the ground for the LED.

FIG. 5 is an example of a block configuration diagram of the circuit of each module. The dimming circuits 51, 52 and 53 for each color of blue, green and red, which are driven by the clock generator 40, are each an enable line 45 for each color. 44, 43 and the shift registers 54, 55, 56 for the respective colors.
The dimming circuits 51, 52 and 53 are the clock generator 4
The clock signal from 0 is divided and the LED is pulsed. Also, enable line 4 for each color
Reference numerals 5, 44, and 43 indicate lighting or non-lighting of each color. The shift registers 54, 55, 56 for the respective colors receive the respective color data as serial data from the respective color signal data lines 48, 49, 50, store the data in the latch circuit 57 as a latch signal, and the clock signal 46 for transmission to the next module. And the output buffer 42 in synchronization with the latch signal 47.
Sent to the shift register of the next module. The signal input to each module is input buffer 41.
It enters and is output from the output buffer 42 for delivery to the next module, which in turn is delivered to all modules. The color data held by the latch circuit 57 turns on the 16 × 16 collective lamp by the driver of each color LED.

In the circuit of FIG. 5, the LEDs used are those shown in FIG.
Because of the circuit configuration shown in (1), the drive control circuit for the blue LED is not a conventional driver 59 configuration for the red or green LED but a constant current driver 58. This is because the blue LED has a high forward voltage, so it will be driven by another power supply (V2 in Fig. 4). It also increases the current value because four blue LEDs are lit in parallel. Therefore, in order to control the subtle brightness of blue independently of other colors, it is more convenient to control the current value. Furthermore, it is possible to adjust and absorb variations in the brightness of blue LED lots, thus improving the quality of the product.

As described above, the circuit of the blue LED is
It has a structure that is independent of the LEDs, and has an independent control circuit structure.Moreover, the number of blue LEDs is increased by using a collective lamp to balance the brightness and improve the controllability of the blue color. It was possible to absorb the variation in LED brightness, and the color expression of the module was improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an LED that constitutes a pixel (collective lamp) of the present invention.

FIG. 2 is a front view of a display panel module having an array of 16 × 16 pixels.

FIG. 3 is a side sectional view of the module of FIG.

FIG. 4 is a circuit diagram showing connection of modules.

FIG. 5 is a circuit diagram showing a configuration of a module.

FIG. 6 is an explanatory diagram showing a configuration of a conventional module.

[Explanation of symbols]

 10 pixels (by three-color LED collective lamp) 20 modules (front display panel) 24 LED driver board 60 display panel

Claims (3)

[Claims] 1. In a collective lamp panel module in which a plurality of LEDs of three primary colors of red, green, and blue are used to form one pixel, and a plurality of the pixels are arranged for color display, the red and green LEDs are anode or cathode. A collective lamp panel module that uses a common circuit and has a blue LED independent circuit configuration. 2. In a collective lamp panel module that uses a plurality of LEDs of three primary colors of red, green, and blue to form one pixel, and arranges the plurality of pixels to perform color display, a dimming circuit is provided for each color LED control circuit. A collective lamp panel module, which is provided with control means for controlling the frequency of the dimming circuit that adjusts the brightness independently for each color. 3. The LED according to claim 1, wherein among the LEDs of the three primary colors, the number of blue LEDs is 4, the number of red LEDs is 2, and the number of green LEDs is 3. Collective lamp panel module.