JPH039106Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a device that displays road traffic information using light emitting diodes as display elements.More specifically, the present invention relates to a device that uses light emitting diodes as display elements to display road traffic information. Collect multiple items to form a group, and define this group as 1
This invention relates to a road traffic information display device that displays road traffic information such as letters and symbols in dotted dots by arranging the dots in a grid pattern and causing desired dots to emit light.

[Prior art]

In this type of device, some of the characters and symbols displayed on the display device can be displayed in different colors. In particular, in road traffic information display devices that display road traffic information, when displaying text such as "Road Closed", the text "Road Closed" is displayed in red, and other text "Ahead" is displayed in yellow. death,
The text "Road Closed" is emphasized to increase the caution of passersby. However, when selecting and displaying an item other than "road closure",
The position of the display color is rarely determined, such as displaying everything in yellow or displaying in a mixture of red and yellow.

Therefore, conventionally, one dot and one dot were displayed for each display item.
A memory element is provided to store in advance whether to display yellow or red corresponding to a dot, and when a display item is selected, the memory element is selected, and the data stored in that memory element causes the display to be displayed in red. For each dot, a dot is displayed, a yellow display, a mixed display of red and yellow, or no display is performed.

However, in such a means, the number of memory elements is the number of dots x the number of display items x the number of emitted light colors, which is very large. In addition, since the light emitting diode is driven for each dot according to its emitted color, the number of wires to the light emitting diode is the number of dots multiplied by the number of emitted colors, so the number of wires is large and complicated, and the wiring work is complicated and uneconomical. There was a drawback.

[Purpose and structure of the invention]

In view of the above points, the present invention was devised in order to solve such problems and eliminate such drawbacks.The purpose of the present invention is to make any part emit light in a desired color without requiring a memory element for display. It is an object of the present invention to provide a device which requires less wiring, that is, the number of dots times the number of items, and which requires fewer wirings to the light emitting diodes.

In order to achieve this purpose, this idea
The first electrodes (cathode) of the light emitting diodes provided for each dot are connected in common, and the second electrodes (anodes) of the same color are provided for each color among the second electrodes (anodes) for all dots. a first memory (MEM ₁ , MEM ₂ ) that sends out information regarding whether or not a certain dot should emit light for all display items;
When a display item selection signal is supplied, a drive circuit (AND ₁ ,
AND ₂ INV ₂ , INV ₂ ) and a dot selection circuit (D SEL ) whose drive circuit is provided for each dot, and a dot selection circuit (D _SEL ) in which the emitted light color for the display item is stored and output based on the supplied item selection signal. The second memory (MEM) supplies a color designation signal to a common terminal for each color.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, and shows an example of displaying in two colors, red and yellow.

In the figure, SW is an item selection switch for switching the display content of road traffic information, and is equipped with item contact a and item contact b, and its common contact is connected to the power supply terminal PS to which the positive voltage (+) of the power supply is supplied. It is connected. DP ₁ and DP ₂ are display blocks with the number of dots required to display characters and symbols, respectively, and the aggregate of display blocks DP ₁ and DP ₂ is a display device.
Forming a DP. The MEM is a block-specific red/yellow memory circuit that stores the display color for each display item and display block _.
It is composed of D ₂ ...D ₅ .

Note that INa and INb are each display block DP ₁
and item input terminals and item input terminals of display block DP ₂ , and CM _1R , CM _2R and CM _1Y , CM _2Y are the red commands as the power supply for the light emitting diodes of display block DP ₁ and display block DP ₂ , respectively. terminal and yellow command terminal.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

First, when item contact a is selected with the item selection switch SW, the (+) voltage from the power supply terminal PS is input to the item input terminal INa of display block DP ₁ and the item input terminal INa of display block DP ₂ , respectively. Select the memory element corresponding to the item in display block DP ₁ and display block DP ₂ , input it to the red/yellow memory circuit MEM for each block, input it to the red command terminal CM _1R of display block DP ₁ through diode D ₁ , Display block DP ₁ in red. At the same time, a signal is input to the yellow command terminal _CM2Y of the display block _DP2 through the diode _D2 , causing the display block _DP2 to display yellow.

Next, use the item selection switch SW to select item contact b.
When you select , the (+) voltage from the power supply terminal PS is input to each item input terminal INb of display block DP ₁ and display block DP ₂ , and the display block
Select the memory element corresponding to the item in DP ₁ and display block DP ₂ , input it to the red/yellow memory circuit MEM for each block, and input it to the yellow command terminal CM _1Y of display block DP ₁ through diode D ₃ . , display block DP ₁ in yellow. At the same time, the red command terminal CM _2R and yellow command terminal CM _2Y of the display block DP ₂ are connected through diodes D ₄ and D ₅ .
Enter this to display a mixture of red and yellow on display block DP ₂ .

That is, for each item, display block DP ₁ is displayed in red and display block DP ₂ is displayed in yellow, respectively, by the diodes that are set and stored in advance for each display block in the red/yellow memory circuit MEM for each block. , display block
DP ₁ will be displayed in yellow, and display block DP ₂ will be displayed in a mixture of red and yellow.

FIG. 2 shows a circuit for selecting and displaying one dot in the display block in the embodiment of FIG.
That is, it is a circuit diagram showing an extracted dot selection circuit D _SEL .

In FIG. 2, the same reference numerals as in FIG. 1 indicate corresponding parts, MEM ₁ and MEM ₂ are an item display memory element, an item display memory element,
AND ₁ is an AND gate that takes the AND of the output of this item display memory element MEM ₁ and the input from the item input terminal INa, and its output terminal is connected to the inverter.
INV ₁ is connected to the common contact of each cathode of red light emitting diode Pd ₁ and yellow light emitting diode Pd ₂ . AND ₂ is a memory element for displaying items
This is an AND gate that takes the logical product of the output of MEM ₂ and the input from the item input terminal INb, and its output terminal is connected to the common connection point of each cathode of the red and yellow light emitting diodes Pd ₁ and Pd ₂ via the inverter INV ₂ . It is connected to the. Also, the and gate AND ₁ ,
INV ₁ constitutes gate circuit G ₁ , and gate
AND ₂ and inverter INV ₂ constitute a gate circuit G ₂ . And this red light emitting diode Pd ₁
and yellow light emitting diode Pd ₂ , each anode has a red command terminal CM _1R and a yellow command terminal, respectively.
It is configured so that the (+) voltage from CM _1Y is input. Although FIG. 2 describes the display block _DP1 , the same applies to the display block _DP2 .

Next, the operation of the embodiment shown in FIG. 1 will be explained in more detail with reference to FIG.

First, when a (+) voltage is input from the power supply terminal PS shown in Fig. 1 to the item input terminal INa, the gate of the AND gate AND ₁ is opened, and if the data stored in the item display memory element MEM ₁ is "1", Data is output from the AND gate AND ₁ , and the output is input to _{the inverter INV 1 ,} where the data is inverted.

Here, if a (+) voltage is applied to the red command terminal CM _1R , the red light emitting diode Pd ₁ is driven by the inverted data of the inverter INV ₁ and displays red. Also, if (+) voltage is applied to the yellow command terminal CM _1Y , the yellow light emitting diode Pd ₂
is driven by the inverted data of inverter INV ₁ and displays yellow. In addition, the memory element for item I
When the data of MEM ₁ is "0", no data is output from the AND gate AND ₁ , so the red light emitting diode Pd ₁ and the yellow light emitting diode Pd ₂ are not driven and are not displayed.

At this time, the AND gate _AND2 does not output data because no (+) voltage is input to the item input terminal INb. Therefore, inverter INV ₂ does not drive red and yellow light emitting diodes Pd ₁ and Pd ₂ .

Next, when a (+) voltage is input to the item input terminal INb, the gate of the AND gate AND ₂ is opened,
Data of item display memory element MEM ₂ is “1”
If so, the data is output from the AND gate AND ₂ , and the output is input to the inverter INV ₂ , which inverts _the data. here,
If (+) voltage is applied to the red command terminal CM _1R , the red light emitting diode Pd ₁ will display red, and if (+) voltage is applied to the yellow command terminal CM _1Y , the yellow light emitting diode Pd ₂ will be displayed. Drive and display yellow. Additionally, if (+) voltage is applied to the red command terminal CM _1R and the yellow command terminal CM _1Y at the same time, the red light emitting diode Pd ₁ and the yellow light emitting diode Pd ₂ are simultaneously driven to perform a mixed display of red and yellow. It turns out.

That is, by inputting from the item input terminal INa or the item input terminal INb, the item display memory element MEM ₁ or the item display memory element MEM _{2 is}
are selected, and the required light emitting diodes are driven by the data stored in these storage elements. On the other hand, the red command terminal CM _1R or the yellow command terminal is used as the power supply for the red and yellow light emitting diodes Pd ₁ and Pd ₂ .
There is a CM _1Y , and depending on whether (+) voltage is applied to either of them, the red light emitting diode Pd ₁ or the yellow light emitting diode Pd ₂ or both will emit light, producing a red or yellow or mixed color display of red and yellow. It turns out.

Now, considering the memory element, the following will occur. The memory elements corresponding to the items are 1 dot, 1
One storage element per item, i.e. storage element MEM ₁ for item representation and storage element for item representation
MEM ₂ is enough. It is sufficient to prepare a number of these corresponding to the number of dots.

Further, it is sufficient that the memory elements for display colors are equal to the number of display colors per item for each display block. That is, in the case of two colors as shown in the memory MEM of FIG. 1, only two wires are required per block. Then, you only need to prepare this for each display block.

If we tried to achieve this using the conventional method, we would select only those to be displayed from among all the light emitting diodes, so we would draw lines from all the light emitting diodes and select the necessary one from among the lines. Become. Therefore, for example, if 100 dots are used in two colors, even if we look at only one display block.
200 lines are required, and it is necessary to control whether or not to display all of them, and what color to display, so the number of wires and control circuits become enormous. However, according to this method, there are two control lines for the items, and for the luminescent color, regardless of the number of dots,
Two lines for each display color will suffice.

Further, when this control is carried out by sending the output data of the memory element dot by dot from the central device to the display device, the amount of data sent from the central device to the display device is small, so the transmission time can be shortened.

Next, if we look at the number of wires, one block only has terminals for display items and terminals for display colors, so we only need wires for the number of items and wires for display colors. It is clear that it is simpler than the conventional one.

This is shown in Figures 6 and 7, which will be described later, and each display block has four display blocks.
The effect becomes even clearer when looking at the case of color. That is, when focusing only on one display block, there are four display colors, so four display color wirings are sufficient (as described above, this is not related to the number of dots). Also, since there are two display items, only two lines are required for the display items.

The reason why the number of wiring lines and the number of memory elements can be reduced in this way is because it is possible to select which dot is to be displayed for each display item, and which display color of that dot is to be emitted. For example, looking at FIG. 7, the emitting color selection signal for selecting which color to display a certain display block is sent to the color-specific common terminals CM _1R , CM _1Y , CM _1A , CM _{1G .}
However, each dot has already selected which dot to display, so the emitting color selection signal is not supplied to all dots. This is because dots that are not selected to emit light do not emit light.

Note that, for example, in FIG. 7, it is also possible to incorporate the item storage element, the item storage element, the AND circuit, and the inverter into one block, and it goes without saying that this will result in further compactness.

In addition, display blocks DP ₁ and DP ₂ consist of the minimum number of dots necessary to display characters and symbols, and when displaying kanji, usually 15 dots vertically x 13 dots horizontally = 195 dots. Consisting of the above,
Also, when displaying katakana, alphabets, and numbers, it is usually composed of 7 dots vertically x 5 dots horizontally = 35 dots, as in the example of the number "3" shown in Figure 4. When displaying symbols such as ○× marks, they may be composed of 25 dots (5 vertical dots x 5 horizontal dots) as shown in FIGS. 5a and 5b. Furthermore, a compound word of two or three characters may be displayed as one display block. Therefore, the dot configuration of the display block is configured to display a certain set of information among the displayed contents, and there are various types such as 195 dots, 35 dots, 25 dots, etc.
It is not limited to a certain number of dots.

An example of the arrangement of light emitting diodes in the case where the display block is 35 dots is shown in FIG. 3. This figure shows one display block. In the figure, Pd ₁ is a red light emitting diode corresponding to the red light emitting diode Pd ₁ shown in FIG. 2, and Pd ₂ is a yellow light emitting diode corresponding to the yellow light emitting diode Pd ₂ shown in FIG. And, these Pd ₁ , Pd ₃ to _{Pd 36} are red light emitting diodes, Pd ₂ , Pd ₃₇ to _{Pd 70} are yellow light emitting diodes, and red and yellow light emitting diodes Pd ₁ ,
The combination of Pd ₂ is one dot, and there are 35 dots in total.
It is made up of dots.

Each of these red light emitting diodes Pd ₃ , Pd ₄ ~ _{Pd 36}
And each dot of the combination of yellow light emitting diodes Pd ₃₇ , Pd ₃₈ to _{Pd 70} is also constructed by the circuit shown in FIG. By applying a (+) voltage to the input terminal and inputting a (+) voltage to the item input terminal, any character or symbol can be displayed in red, yellow, or a mixed color of red and yellow within this implementation range. For example, red light emitting diodes Pd ₁₆ , Pd ₁₀ , Pd ₄ ~ _{Pd 8}
By lighting the red light emitting diodes Pd ₂₄ , Pd ₃₂ to _{Pd 36} and the red light emitting diodes Pd ₁₃ , Pd ₂₀ , Pd ₂₇ , the letter "A" of the alphabet can be displayed in red.

The present invention has been described above using as an example the case where the block-specific red/yellow memory circuit MEM is configured with a diode matrix memory circuit as a memory circuit that stores display colors for each display item and display block. The present invention is not limited to this, and other memory circuits may be used.Also, in the above embodiment, the case where two display colors, red and yellow, are used is explained as an example, but other memory circuits may be used. It can be a color,
It can be three or more colors. In addition, a memory element for displaying items
For MEM ₁ and MEM ₂ , random access memory (RAM) may be used to store data for display when necessary, or read-only memory (ROM) may be used to store data for display in advance. You can leave it there. In addition, although the display items have been explained using two items, any number of items may be used. Also, although the display blocks have been explained using two blocks as an example, the present invention is not limited to this. It may be one block or three or more blocks. For example, FIGS. 6 and 7 show an embodiment in which there are four display blocks and four display colors, and FIG. 7 shows a circuit in which the number of dots is n. The operation of these circuits is the same as that described above, except that the display colors, display items, and number of dots are increased, so a description thereof will be omitted.

As can be seen from this circuit, even if the number of display colors increases, the memory MEM can easily handle this by increasing the number of memory elements for each display color for each display block. This can be easily achieved by increasing the number of pixels by that amount, so the effect of the present invention is particularly noticeable when there are many display colors and there are many display dots in a display block.

[Effect of idea]

As is clear from the above explanation, according to the present invention, since the memory stores information on whether to display each dot for each dot, the number of memory elements required is the number of dots x the number of items. Since whether or not to display the dots is selected, the current supplied to each dot of the same display color can be shared, and therefore the number of wirings can be reduced, which is extremely effective in practical use.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure is a circuit diagram showing an example of the circuit for one dot extracted from the part related to the display block in the embodiment of Fig. 1, and Fig. 3 is an example of the arrangement of light emitting diodes when the display block is 35 dots. 4 and 5 are diagrams showing the relationship between various display states and the number of dots, and FIGS. 6 and 7 are circuit diagrams in the case of four blocks and four colors. Pd ₁ , Pd ₃ ~ Pd ₃₆ ... Red light emitting diode,
Pd ₂ , Pd ₃₇ ~ Pd ₇₀ ...Yellow light emitting diode, DP ₁ ,
DP ₂ ...Display block, MEM...Red/yellow memory circuit for each block.

Claims (1)

[Scope of claim for utility model registration] A selection switch (SW) that changes the display content,
Display device (DP) and memory circuit for color selection (MEM)
The display device (DP) is a road traffic information device consisting of a plurality of display blocks (DP ₁ ,
Each display block is composed of a plurality of dot _selection circuits (D _SEL ) and displays a group of information depending on the light emitting state of the dot selection circuits (D _SEL ). is the item selection terminal (INa, INb...) provided corresponding to the display item,
Display color selection terminals (CM _1R , CM _1Y , CM _2R , CM _2Y ...) provided corresponding to the display colors, display dots (PD), and item display memory elements (MEM) provided for each display item. ₁ , MEM ₂ ...) and gate circuits (G1, G2...), and each dot selection circuit (D _SEL ) has the same type of item selection signal terminal and the same type of display color in the same display block. The selection signal terminals are commonly connected to each other, and the display dot (PD) is a collection of light emitting elements (PD ₁ , PD _{2 .} . . ) that emit light of different colors, and the first electrode of each light emitting element is The second electrode is connected to the corresponding display color selection terminal (CM _1R , CM _1Y , CM _2R ,
CM _2Y ...), and the output signals of the item display memory elements (MEM ₁ , MEM ₂ ...) are connected to the light emitting elements through the corresponding gate circuits when the item selection signal is supplied to the corresponding item selection terminal. The selection switch (SW) sends the selected display item signal to the color selection memory circuit (MEM) and each display block (DP ₁ , DP ₂ ). ...), and the color selection memory circuit (MEM) inputs the signal when the display item signal selected by the selection switch (SW) is supplied. A road traffic information display device characterized in that a color selection signal determined for each display block (DP1, DP2...) is individually supplied to a corresponding color selection terminal of each display block.