JP2822129B2 - Two-color display method for multi-color - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-color two-color display method for displaying color information composed of three-color data by two-color light-emitting elements, and more particularly to a teletext display. It is usefully used for

[0002]

2. Description of the Related Art Conventionally, in an LED type teletext receiving system, a red, green, and green transmitted from a teletext center are used.
Multicolor information consisting of three colors of blue is processed only for two colors of red and green, and is displayed by a red LED and a green LED. That is, the transmitted color information is composed of color data of three primary colors of red, green and blue for each pixel constituting the dot matrix type display screen.
Of these, using only the red and green color data, the red L
By causing the ED and the green LED to emit light, each pixel is displayed in a mixed color of two colors of red and green and orange (simultaneous lighting of red and green).

[0003] By mounting a blue LED together with a red LED and a green LED, multi-color display can be performed. However, with the current manufacturing technology, a blue LED is more sufficient than LEDs of other colors. Brightness cannot be obtained,
In addition, due to the high cost, the teletext receiving system does not include a blue LED and ignores blue color data for color information including blue color data, and displays only red and green. ing.

[0004]

However, in the above-described two-color display method in which blue is omitted, if the background and the image are similar colors, the image is buried in the background.
There is a problem that the image cannot be determined. For example, if the background is a mixed color of red and blue and the image is red, blue is not displayed, so both the background and the image are displayed in red, making it impossible to identify them at all.

In view of the above, the present invention provides a two-color display corresponding to three-color multi-color information.
It is an object of the present invention to provide a multi-color two-color display method capable of displaying an identifiable image.

[0006]

According to the present invention, there is provided, in accordance with the present invention, display of color information comprising three color data by means of a light emitting element having two of the three colors. In the multi-color two-color display method that is performed, a combination of each color is detected from the input three-color data, and the combination includes color data for one color having no corresponding color light emitting element. Are multi-colored
In the case of combination, the light emitting element by the light emitting element driving circuit
It is characterized in that the light emission time of the light emitting element is controlled to reduce the light emission luminance of the light emitting element.

[0007]

According to the above arrangement, for example, when color information including three color data of red, green and blue is displayed by a light emitting element of two colors of red and green, for example, blue color data is included. Regarding the color information, since the light emission luminance of the other two color light emitting elements is reduced, when the background and the image are similar colors, it is better to include the blue color data of the background and the image.
Since the light emission luminance of the light emitting element is reduced, the background and the image can be distinguished from each other due to the difference in light emission luminance even if the background and the image have the same emission color. The display does not become the same as the light emission display, and a display that can be surely identified is performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of a multi-color two-color display device for realizing the present invention.
In FIG. 1, a two-color display device 10 includes a data recorder 11 that detects a color combination from three primary color data of red R, green G, and blue B with respect to color information input from a teletext receiver or the like. Color data is selected based on the combination of colors detected by the data recorder 11, and the corresponding color data is selected.
A color data selection circuit 12 for outputting a color signal to the flip-flop circuit, a delay circuit 13 for delaying the operation timing of the color data selection circuit 12, a frequency division circuit 14 for dividing the common scan signal, and one input terminal An XOR circuit 16 which receives an output signal from the color data selection circuit via a flip-flop circuit 15 and receives a frequency-divided pulse from the frequency-divider circuit 14 at the other input terminal and outputs an exclusive OR signal It is composed of

As shown in FIG. 2, the two-color display device 10
The color data shown in the right column is output for each of the color data of two or more colors among the inputted R, G, B in the left column. That is, (R + B), (G + B)
When blue color data is included, as in (R + G + B), the other color data R or G is set to half brightness.

Here, a clock signal is input to the color data selection circuit 12 and the delay circuit 13 from a clock circuit (not shown). Since the timing of the clock signal and the timing of the color data signal are shifted as shown in FIG.
The color data selection circuit 12 holds the color data at the rising edge t ₁ of the clock signal,
The display color data is generated at a timing t ₂ delayed by 3.

The frequency dividing circuit 14 includes a data recorder 1
When 1 detects a combination of blue and another color, it is operated by a control circuit or the like (not shown),
It is configured to perform frequency division of 1 / n, for example, 1/2. This frequency dividing circuit 14 is a combination of blue and other colors.
Only operates when, for example, dividing the common scan signal,
By processing the output, a divided pulse is output.
It is. Dot matrix lighting, for example, common key
When 16 pulses of scan signal are input to the display device, one screen is displayed.
If it can be displayed, the frequency divider is used when displaying the first screen.
To output a pulse. Display of the Nth screen from the next two screens
In this case, the frequency divider does not output. The N + 1th screen is pulsed
Output. In this way, the frequency divider operates during operation.
A frequency-divided pulse is output at regular time intervals. So this
Whether to increase or decrease the divided pulse output time
The ratio of the low brightness of the LED can be changed. The flip-flop circuit 15 generates a color signal pulse when the color data signal from the color data selection circuit 12 is input as a trigger signal.

The XOR circuit 16 further includes a frequency dividing circuit 14
, And a color signal pulse from the flip-flop circuit 15, an exclusive OR signal of these two signals is output to an LED drive circuit (not shown). I have. The flip-flop circuit 15 and the XOR circuit 16 are provided for each of red and green colors, and are indicated by dotted lines A and B, respectively.

The embodiment of the present invention is configured as described above. For example, in the case of monochromatic color data of R (red) or G (green), the data recorder 11 converts the color data as it is into a color data selection circuit. 12 is sent. In the case of monochrome color data of B (blue), the data recorder 11 does not send the color data to the color data selection circuit 12. Further, in the case of mixed color data consisting of two or three colors, the combination of the input color data of the three primary colors R, G, B is detected by the data recorder 11 and sent to the color data selection circuit 12.

Here, in the case of only R or only G,
The color data selection circuit 12 outputs the color signal as it is to the flip-flop circuit 15 as a trigger signal. Also,
In the case of (R + G), the color data selection circuit 12 outputs, for example, R and G color signals to the respective flip-flop circuits 15 as trigger signals.

In these cases, since the frequency dividing circuit 14 is not operating, the output signal of the flip-flop circuit 15 is directly passed through the XOR circuit 16 to each of the red LEs.
Sent to the D drive circuit and the green LED drive circuit,
Red and green light emission display can be performed at normal luminance.

On the other hand, blue (B +) color data is included (R +
In the case of (B), (G + B) and (R + G + B), the data recorder 11 detects that the blue B color data is included, and based on the detection signal, the control circuit (not shown) controls the frequency dividing circuit 14. To work. As a result, the frequency dividing circuit 14 generates a 1 / n frequency dividing pulse, and the XOR circuit 16
To one input terminal. At the same time, color data of other colors except the blue B color data is sent from the data recorder 11 to the color data selection circuit 12. For example, R single color
In the case of data, the frequency divider circuit
14 does not operate, and the data recorder 11 outputs the R color data.
Is sent to the color data selection circuit 12 as it is,
The path 12 ends up with normal brightness by the A circuit based on the R color data.
Red R is displayed in degrees (FIG. 1).

Here, the input color information is (R +
B), (G + B), the color data selection circuit 12
Send the R and G color signals to the respective flip-flop circuits 15 as trigger signals. FIG.
FIG. 7 shows a time chart of each signal in the case of (R + B). For example, in the case of (R + B),
D11 detects that it is a combination of B and another color,
The frequency dividing circuit 14 operates and outputs a frequency dividing pulse. Another day
The R data is output from the color recorder 11 by the recorder 11
Sent to Then, the operation of the frequency dividing circuit is added to the XOR of the A circuit.
Is delayed by the divided pulse and the F / F15
R signal is input, and the R LED is activated.
A signal with an optical time of 1 / n is output from the XOR (see FIG.
1 and FIG. 2). As a result, the red color whose brightness has been reduced to 1 / n
R is displayed. In the case of G single color and R + G, a frequency divider circuit
Does not operate, and the normal luminance G and the normal luminance R + G are respectively used.
In the case of G + B including B, the frequency divider operates and the frequency divider
Is output, the luminance is expressed as 1 / n of the normal luminance G.
Is shown.

The input color information is (R + G +
In the case of B), the color data selection circuit 12 outputs the R and G color signals to the respective flip-flop circuits 15 as trigger signals. Divider circuit operates
And outputs a frequency-divided pulse.
/ N brightness, 1 / n of normal brightness G
You.

As a result, since the frequency dividing pulse is input to one input terminal of the XOR circuit 16 by the operation of the frequency dividing circuit 14, the n output pulses of the flip-flop circuit 15 , The output pulse of the XOR circuit 16 rises once, and the light emission time of the LED emitted by each LED drive circuit is 1 / n.
As a result, the LED of each emission color emits light with low luminance. In the case of 1/2 frequency division,
Each LED emits light at half brightness.

In the above description, the case where an LED is used as a light emitting element has been described. However, the present invention is not limited to this, and it is apparent that another light emitting element may be used. In addition, the emission color of the light emitting element is not limited to the three primary colors of red, green, and blue, but may be any combination such as red, yellow, and green that can be distinguished from each other. Can be applied.

[0021]

As described above, according to the present invention,
For example, when color information including three color data of red, green, and blue is displayed by using two color LEDs of red and green, for color information including blue color data, other two color LEDs are used. Since the light emission luminance of the background and the image are similar colors, the light emission luminance of the LED is reduced when the base and the image that include the blue color data are reduced.
The background and the image can be distinguished from each other by different emission luminances even if the emission colors are the same. Therefore, unlike the related art, the background and the image do not have the same light emission display, and a display that can be reliably identified is performed. Thus, according to the present invention, there is provided an extremely excellent two-color display method for multicolor, which is capable of displaying an image that can be identified by two-color display in accordance with three-color multicolor information. .

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing one embodiment of a two-color display device to which a method according to the present invention is applied.

FIG. 2 is a table showing a conversion table of color data by a data recorder in the two-color display device of FIG. 1;

FIG. 3 is a time chart of each signal in the two-color display device of FIG. 1;

[Explanation of symbols]

 Reference Signs List 10 two-color display device for multi-color 11 data recorder 12 color data selection circuit 13 delay circuit 14 frequency divider 15 flip-flop circuit 16 XOR circuit

Claims (1)

(57) [Claims] 1. Color information comprising three color data is
In the two-color display method for multicolor, in which display is performed by light-emitting elements having two emission colors among the three colors, a combination of each color is detected from input three-color data, and the combination is detected. , A combination of multiple colors that contains color data for one color that has no corresponding color light emitting element
In the case of light emission, the light emitting element drive circuit emits light
A two-color display method for a multi-color display, wherein a time is controlled to reduce light emission luminance of a light emitting element.