JPH0426117B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical field of the invention] The present invention uses light emitting diodes of three different colors (hereinafter referred to as LEDs) as unit elements,
The present invention relates to a multicolor display device that displays a pattern to be displayed in multiple colors by using a matrix display panel in which LEDs of these three colors are arranged in a matrix. [Prior Art] Conventionally, there has been a display device in which LEDs that emit light of various colors such as red, green, or blue are made into a unit and these LEDs are combined to display a multicolor display. However, in this type of display device, each LED
When performing multicolor display by combining the emitting colors of
Since the LEDs are driven to emit light at a constant duty, the brightness of each display color becomes uneven, resulting in uneven brightness, which impairs display quality, and also makes it impossible to display arbitrary patterns in multiple colors. It was hot. [Summary of the Invention] The present invention has been made in view of the above points, and its purpose is to provide a matrix display in which LEDs of three different colors are used as unit elements and these three color LEDs are arranged in a matrix. An object of the present invention is to provide a multicolor display device that can display any pattern to be displayed in multiple colors without uneven brightness by using a panel. In order to achieve such an objective, the present invention
A matrix display panel in which LEDs of three different colors emitting light are used as unit elements and LEDs of these three colors are arranged in a matrix, and this matrix display panel is arranged in the matrix display panel in accordance with the pattern to be displayed. A three-color pattern signal generation circuit that generates an arbitrary pattern signal for each row of LEDs, and three-color color signals each having a duty of one integer of the number of combined colors based on the color information. and a color signal generation circuit that selects the three color signals generated by the color signal generation circuit using pattern signals generated from each of the pattern signal generation circuits, and generates the color signals based on the selected color signals. A selection drive circuit that sequentially drives each row of LEDs arranged on the matrix display panel, and each LED arranged on the matrix display panel in synchronization with each pattern signal generated by the three color pattern signal generation circuits. The display is equipped with a drive circuit that sequentially drives the rows, and is configured to display an arbitrary pattern in multiple colors based on color information. Embodiments of the present invention will be described in detail below with reference to the drawings. [Embodiment] FIG. 1 is a block diagram of a circuit configuration showing an embodiment of a multicolor display device according to the present invention.
The pattern to be displayed is divided into three zones, and each zone is divided into three zones with a combination of red, green, and blue.
This shows the case of multicoloring. In the same figure, 1 represents three colors, red, green, and blue, respectively.
LED2, 3 and 4 are unit elements, and these
LEDs 2 to 4 share one of the row selection lines X ₁ to X _o and are independent triple row selection lines Yr ₁ for each color.
~Y _rn , Y _g1 ~Y _gn and Y _b1 ~ _{Y bn} are respectively connected to intersecting positions and arranged in a matrix, and each of the LEDs 2
~4 is for convenience, LED2~4 in the 1st row and 1st column is 2 ₁₁ ,
3 ₁₁ and 4 ₁₁ , and below, the numerical values of each row and column are similarly indicated by subscripts. Further, 10 is a clock generator that generates clock pulses of a predetermined frequency, and 11 is a clock generator 1.
This is a hexadecimal counter that counts clock pulses sent from 0, and this output pulse φ has a period of 6To, where To is the period of the clock pulse. 12 is an n-ary row counter that receives the pulse φ from the hex counter 11; 13 is a row decoder that decodes the output from the row counter 12; 14 is each row selection line X ₁ to X of the matrix display panel 1; This drive circuit consists of transistors 14 ₁ to 14 _o , which are connected to the row decoder 13 _, respectively.
By turning on and off ₁ to 14 _o , the row selection lines X ₁ to X _o of the matrix display panel 1 are sequentially driven. Note that each row counter 12, row decoder 13, and drive circuit 14 constitute a row drive circuit 15. Further, 16 is a scanning circuit consisting of an m-ary counter, a decoder, etc. which receives the pulse φ from the hexadecimal counter 11 as input, and this scanning circuit 16 uses its scanning output to generate a pattern signal of each pattern signal generation circuit, which will be described later. are read out sequentially. 17, 18, and 19 are red, green, and blue pattern signal generation circuits that generate arbitrary pattern signals corresponding to patterns to be displayed on the matrix display panel 1, and these pattern signal generation circuits 17 to 19 Each LED 2 ₁₁ - 2 _on , 3 _{11 -} 3 _on and 4 ₁₁ - 4 _o arranged on the matrix display panel 1 by the scanning output from the scanning circuit 16
An arbitrary pattern signal is sequentially generated for each row corresponding to _n . In this case, each pattern signal generation circuit 17 to 19 has input terminals in X rows corresponding to the rows and columns of the matrix display panel 1.
It consists of ordinary matrix boards ₂₀ to 22 having output terminals y ₁ to _{y n in} Y columns, and by sequentially scanning these input terminals x ₁ to x _o with the scanning output of the scanning circuit 16, Output terminals for each row of pattern signals set in advance on the board 25 (indicated by circles in the figure)
It is configured to take out from y ₁ to _{y n} . Further, 30 is 3 synchronized with the pulse φ as color information to be displayed on the matrix display panel 1.
Color red signal R ₁ ~ _{R n} , green signal G ₁ ~ _{G n} and blue signal
B ₁ to _{B n} are input circuits that are inputted in a time-division manner,
This input circuit 30 has m input OR circuits 31r, 3
1g and 31b. Reference numeral 32 inputs the time-divided red signal R, green signal G, and blue signal B input through each of the OR circuits 31r to 31b, and based on these color information, a red signal having a duty of 1/integer of the number of combined colors. This is a color signal creation circuit that creates a signal R, a green signal G, and a blue signal B, respectively. For example, when a signal of one color is input as color information, this color signal creation circuit 32 converts the color signal of duty 1 into two colors. When a combination of three colors is used, a color signal with a duty of 1/2 is created, and when a combination of three colors is used, a color signal with a duty of 1/3 is created. A specific example is shown in FIG. Here, 33 is each of the OR circuits 31r to 31
This is a BCD decoder that decodes the red signal R, green signal G, and blue signal B that are input as color signals from the BCD.If the high level of each color signal is "H" and the low level is "L", For the red signal R, green signal G, and green signal B, outputs are obtained as shown in the truth values in Table 1.

〔Effect of the invention〕

As explained above, according to the multicolor display device of the present invention, LEDs of three different colors are used as unit elements, and when driving a matrix display panel in which these three color LEDs are arranged in a matrix, By driving each LED to emit light using a color signal that has a duty that is an integer of the number of combined colors in the color information, it is possible to make the brightness of each display color uniform, and also to create any pattern in multiple colors. There are effects such as being able to display images.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the circuit configuration of a multicolor display device according to an embodiment of the present invention, FIG. 2 is a circuit configuration diagram showing a specific example of the color signal generation circuit of FIG. 1, and FIG.
Figures a to f are timing charts obtained at the output terminal of a BCD decoder, which serve to explain the operation of the color signal generation circuit shown in Figure 2. 1... Matrix display panel, 2 ₁₁ ~ 2 _on ...
Red LED, 3 ₁₁ ~ 3 _on ... Green LED, 4 ₁₁ ~
4 _on ...Blue LED, 10...Clock generator,
11...Hex counter, 15...Drive circuit, 16
... Scanning circuit, 17 to 19 ... Pattern signal generation circuit, 30 ... Input circuit, 32 ... Color signal creation circuit, 41 ... Selection drive circuit.

Claims (1)

[Claims] 1 LEDs of three different colors are used as unit elements,
A matrix display panel in which LEDs of these three colors are arranged in a matrix, and an arbitrary pattern signal is generated for each row of each LED arranged on the matrix display panel in accordance with the pattern to be displayed on this matrix display panel. A three-color pattern signal generation circuit that generates three-color pattern signals, a color signal generation circuit that generates three-color color signals each having a duty equal to an integer fraction of the number of combined colors based on the color information, and a color signal generation circuit that generates three-color pattern signals based on the color information. The color signals of the three colors to be displayed are selected by the pattern signals generated from each of the pattern signal generation circuits, and the rows of LEDs arranged on the matrix display panel are sequentially selected based on the selected color signals. a selection drive circuit for driving, and a drive circuit for sequentially driving each row of LEDs arranged on the matrix display panel in synchronization with each pattern signal generated by the pattern signal generation circuit for the three colors; A multicolor display device characterized by displaying an arbitrary pattern in multiple colors based on information.