JP3238914B2 - Display device and display control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a display device for displaying information and a display control method, for example, a display device having a dot matrix LED display unit of a dynamic drive system and a display control method.

[0002]

2. Description of the Related Art Scroll display control in a conventional dynamic drive type dot matrix LED display panel has been performed as follows.

For example, in a first display control method,
The LED display has four pixels × 4 pixels (4 dots × 4 pixels) shown in FIG.
In the case of a display that displays one digit with 4 dots) and the vertical scanning as shown in FIG. 8 is performed, when scrolling the display from the right side to the left side of the display, A line is scanned, data is input from the right side, and the input data is shifted left by one dot.

That is, the moving state and the display state of data when scanning is sequentially performed from the scan line 1 to the scan line 4 in the vertical scanning are as shown in FIG. In FIG. 9, focusing on only one dot, in the scan a, the display data comes to the position 1 on the display unit shown at the bottom, so that it is lit on the scan line 1.

Next, in the scan b, the display data is shifted one dot to the left and comes to the position 2, so that the scan line 2
Lights up. Thereafter, by the same operation, the dots are sequentially shifted to the left to realize the scroll display.

As a second display control method, as shown in FIG. 10, a vertical line is scanned and the scanning order is changed to (1234).
-341-3412-4123-1234...).

In the above control method, the scan direction is the vertical direction. However, as a display control method for shifting data from the right side to the left by one dot at a time when the scan direction is the horizontal direction, a third display control method described below is used. was there.

FIG. 11 shows an LED display having a horizontal scanning direction controlled by the third display control method. In the case of scrolling from right to left in this LED display in the same manner as described above, a horizontal line is scanned, data is input from the right side, and the data is scrolled by shifting one dot to the left to display the scroll.

More specifically, the control is performed as shown in FIG. When seeing the scroll of only one dot in scan line 1 which is the bottom line, first, the light is turned on in scan line 1 and the light is turned on in scan line 1 even when shifted to the left by one dot. In this way, control is performed so that the light is always emitted on the scan line 1.

[0010]

However, in the first display control method shown in FIG. 9 described above, scroll display is performed without any problem in the same digit (ad) shown in the lowermost row. At the boundary (the boundary between d and e), the interval between the lighting of the dots was short. As a result, due to the afterimage effect, the display appears to be stretched at the boundary between the digits. Conversely, scan (from scan lines 4 to 1)
To), the display shrunk at the digit boundaries.

In order to alleviate such a state, for example,
In some cases, measures have been taken to increase the number of scans for one data line to make display expansion and contraction less noticeable.
Conversely, the dots appeared blurred and a clear display effect could not be obtained.

Further, in the second display control method shown in FIG. 10, the lighting interval does not change at the digit boundary, so that the display can be prevented from expanding and contracting at the digit boundary as in the first display control method. As shown in FIG. 13, for example, a scan line having an interval at scan line 1 longer than the others as shown between a and b occurs.

For this reason, a phenomenon in which the vertical line is missing has appeared. When scanning was performed in the reverse direction, only certain vertical lines appeared bright.

In order to alleviate such a phenomenon, there is an example in which the number of scans for one data line is increased to make this phenomenon inconspicuous. However, on the contrary, the dots appear to be blurred and clear. The display effect could not be obtained.

Further, in the third display control method, since the scanning is performed by the horizontal line, there is no expansion or contraction of the character at the boundary of the digit as in the horizontal scrolling, and the phenomenon that the vertical line appears to be missing. The fact that a human actually recognizes the fact that there is a scan time difference in the horizontal line (the state in which the horizontal line is actually visible) is that the vertical line looks oblique during horizontal scrolling as shown in FIG. For this reason, when the characters were displayed, the characters were inclined obliquely.

[0016]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has, for example, the following structure as one means for achieving the above-mentioned objects.

That is, the present invention provides a display device including a dynamic drive type dot matrix display having a plurality of scan blocks, wherein when a display dot is scrolled, at a boundary between the scan blocks of the plurality of scan blocks, the next scan block is scrolled. A display control means for delaying the scrolled display dots by one cycle and then performing scroll display is provided.

[0018] For example, the dynamic drive type dot matrix display uses a control signal capable of simultaneously selecting the same scan line in each scan block. It is characterized in that the order is always fixed.

Also, for example, in the dynamic drive type dot matrix display, the same scan line of each scan block is connected in cascade, the energization time of one scan line is always constant, and the scan order is always constant. It is characterized by.

Further, for example, the delay of the display dot of the display control means for a predetermined time is a delay of one cycle time, and is performed at a boundary of a scan block in scroll display in a direction orthogonal to a scan line. Features. Alternatively, one cycle delay of the display dot of the display control means may be such that at the time of generation of the display data, at least one blank line is added to the original data to be displayed in one block in the scan line direction and developed. Sometimes, at least one line is skipped for each scan block, and data is read while being sequentially shifted, and the data is read and output to the dynamic drive type dot matrix display.

[0021]

With the above arrangement, the scroll display can be smoothly and clearly displayed.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a display device according to an embodiment of the present invention. In the following description, an example in which a three-digit LED dot matrix display having three display units is provided will be described. However, the present invention is not limited to the above example, and it goes without saying that a display device having a display device with an arbitrary digit may be used.

In FIG. 1, reference numeral 100 denotes a display device according to the embodiment. An information processing device 200 supplies display information to the display device 100 of the present embodiment and controls display.

In the display device 100, 110 is a control board, 160 is a display unit A, 170 is a display unit B, and 180 is a display unit C. Each of the display units A160 to C180 is a display unit with a driver substrate, and is configured by, for example, a display device that displays one digit with 4 pixels × 4 pixels (4 dots × 4 dots) shown in FIG. The scanning direction is also the direction shown in FIG.

Each of the display units 160 to 180 constituting each scan block uses a control signal capable of simultaneously selecting the same scan line, or each display unit 1
The same scan lines 60 to 180 are cascade-connected, and are controlled so that the energizing time of one scan line is always constant and the order of scanning is always constant.

The control board 110 includes the following components. That is, in the control board 110, 1
Reference numeral 11 denotes an interface circuit (I / F circuit) that controls an interface with the information processing apparatus 200, and reference numeral 112 denotes a control unit that controls the entire control of the display device 100 according to the present embodiment.

Reference numeral 113 denotes a ROM for storing control procedures of the control unit 112, 114 denotes a RAM for storing display data and the like, and 115 denotes a power supply unit.

The control board 110 has the above-described configuration, and supplies a scan selection signal (selects a scan line by a combination of these signals) and other clock signals, data latch signals, display data, and blanking to each of the display units 160 to 180. Signal lines for signals, logical ground signals, etc. are supplied, and each signal line is cascaded to the display unit.

Further, display unit driving power from a power supply unit 115 is individually supplied to each display unit from the control board 110.

The control board 110 is provided with the above-described configuration, so that the display units 160 to 180 are provided.
And display with each display effect by the control signal.

Hereinafter, the display control of the embodiment having the above configuration will be described. In the present embodiment, the interval between the lighting of the dots is shortened at the boundary of the digit (the boundary between d and e) as shown in FIG. 9 in the related art, and the display appears to extend at the boundary of the digit due to the afterimage effect. To improve the situation
The display is controlled as shown in FIG. FIG. 2 is a diagram for explaining scroll control according to the present embodiment.

In the present embodiment, the display control shown in FIG. 2 is performed during scrolling under the control of the control unit 112 in accordance with the control procedure stored in the ROM 113. FIG.
Is an example of scrolling from right to left when '/' is displayed.

For example, in the case of left scroll in which scan lines 1 to 4 are sequentially shifted from right to left, as shown in FIG. 2, data for one scan line is displayed at the boundary of the digit where the display unit switches. Without letting 1
The data of f is displayed with the period delayed. The same applies to the subsequent steps. The same applies to other dots.

Hereinafter, the scroll control according to the present embodiment will be described in detail with reference to FIG. FIG. 3 is a flowchart showing scroll control in the present embodiment.

In this embodiment, when the scroll of the display data is instructed, the processing shifts to the processing of FIG. Then, first, it is checked whether or not the scroll direction is instructed in step S2. If the scroll instruction has not been issued, the process proceeds to step S3, and it is determined whether or not the end of the scroll processing has been instructed. When the scroll end is instructed, the process ends.

On the other hand, if the end of the scroll is not instructed in step S3, the process returns to step S2, and waits for an instruction of the scroll direction (an instruction of the scroll amount) or an instruction of the end of the scroll.

In step S2, when a scroll instruction is issued together with the scroll direction, the flow advances to step S4, and it is determined whether or not the shift of one digit has been completed as a result of the scroll and it is the boundary for switching the digits to the display unit. . If it is not the boundary where the digits of the display unit are switched, the process proceeds to step S5, where the development data is shifted by one dot and controlled to be turned on for one cycle in synchronization with the clock signal (CLK). Then, the process returns to step S2.

On the other hand, if it is determined at step S4 that the digit is to be switched to the display unit, the process proceeds to step S6.
Control is performed so that the boundary data is not displayed for one cycle (one clock cycle). Then, the process returns to step S2.

As described above, at each boundary (digit boundary) of the display unit which is a plurality of scan blocks when the display dot is scrolled, the display dot scrolled to the next display unit (digit) at the time of scrolling is displayed for a predetermined time.
For example, after a delay of one cycle, scroll display is performed (so that one cycle is not displayed).

FIG. 4 shows an example of the scan timing of the present embodiment described above. As shown in FIG. 4, the control is performed so that the data to be lit on the scan line 1 in the scan e is not displayed, and the data is displayed in the scan f after being delayed by one cycle. The same applies to the subsequent steps. The same applies to other dots.

As described above, if control is performed so that the data is displayed in the next scan (delayed by one cycle) without displaying the data in the scan e, the lighting between the dots at the boundary of the digit as in the related art can be achieved. The interval becomes shorter (longer) than the lighting interval between the other dots, and the display can be seen to expand (shrink) at the boundary of the digits, and the brightness of the vertical line caused by the difference in the scan interval between the scan lines is eliminated.

FIG. 5 shows a display state at the time of scroll control in the case of delaying by one cycle. As shown in FIG. 5, data for one scan line is not displayed at the boundary of the digits, but data for f is displayed one cycle later. In the example shown in FIG. 5, the display state of the dots at the boundary is shifted, but since the display method using the afterimage effect by the dynamic drive is employed, the scroll display is smoothly performed by the afterimage effect. appear.

As described above, according to the present embodiment, when the display dots are scrolled, at each boundary (digit boundary) of the display unit which is a plurality of scan blocks,
By controlling the display dots scrolled to the next display unit (digit) during scrolling for a predetermined time, for example, one cycle, and then displaying them (controlling not to display them for one cycle), scrolling can be performed with simple control. The display can be made smooth and clear.

Further, since this function is realized by executing the control procedure stored in the ROM 113 by the control unit 112, there is no need to add a hardware configuration of the control board 110, and a conventional control board can be used. Even a display device having such a configuration can be dealt with only by rewriting the control procedure of the ROM 113.

Further, even if the scanning speed is reduced (the scrolling speed is reduced), the same control can be used without any problem, and special fonts such as external characters as well as normal fonts can be directly handled. Other display effects can be supported.

Furthermore, in this embodiment, since the scanning is performed by the vertical line, the display does not look oblique at the time of horizontal scrolling, such as when scanning is performed by the horizontal line.

[Second Embodiment] In the above description, control is performed such that data is not displayed for one scan line at the boundary of the digit where the display unit is switched, but is displayed after being delayed by one cycle. An example was performed. However, the present invention is not limited to the above examples. For example, at least one blank line is added to the actual font data or scan block for each digit in a vertical line, and the data is expanded on a memory and displayed. At the time of supply to the unit, one line is skipped for each scan block, data is read while being sequentially shifted, and the data is supplied to the display unit, whereby the scroll display can be made smooth and clear.

A second embodiment according to the present invention for controlling in this manner will be described below. Note that also in the second embodiment, the hardware configuration is the same as that of the first embodiment shown in FIG.
Since it is the same as the embodiment, detailed description is omitted.

In specific display control, when scroll control is executed, one blank line is added to the actual font data from the information processing apparatus 200 for each digit, and a blank line is added to the actual font data.
Expand on M114. When the data is supplied to the display unit (when the data is read from the RAM 114), the data is read while skipping one line for each scan block and sequentially shifted so that the actual font size from the information processing apparatus 200 is obtained. Then, by supplying the data to the display unit, the scroll display is made smooth and clear.

The details of the scroll control in the second embodiment will be described with reference to FIGS. FIG. 6 is a flowchart showing scroll control according to the second embodiment of the present invention. FIG. 7 is a diagram showing the state of data developed in the display data storage area of the memory at the time of scroll control according to the second embodiment. FIG. In FIG. 6, the same processes as those in the first embodiment shown in FIG. 3 described above are denoted by the same step numbers.

In the second embodiment, when the scroll of the display data is instructed, the processing shifts to the processing of FIG.
It should be noted that also in the second embodiment, scanning is performed on vertical lines. First, in step S1, the RAM 11
The display information stored in the area for storing the display information from the information processing device No. 4 or the display information sent from the information processing device 200 is expanded in the display buffer area for the display of the RAM 114 in dot units. .

At this time, blanks are added to the original display dot data (data obtained by developing the dot pattern of the display data from the information processing apparatus 100) at each boundary where the digits of the display dots are switched and developed. . This developed state is the state shown in the upper strip of FIG. 7, and ● is a dot to be lit. That is, in addition to the display data of 4 × 4 on the original display unit, a blank for one vertical line at each boundary where a digit is switched is added and developed.

When this development is completed, it is checked in step S2 whether or not a scroll direction has been instructed. If the scroll instruction has not been issued, it is determined whether or not the end of the scroll processing has been instructed. When the scroll end is instructed, the process ends.

On the other hand, if the end of the scroll is not instructed in step S3, the process returns to step S2 and waits for the instruction of the scroll direction (the instruction of the scroll amount) or the end of the scroll.

In step S2, when a scroll instruction is issued together with the scroll direction, the process proceeds to step S4, and it is determined whether or not the reading has been skipped for each scan block of the display unit by shifting one digit as a result of scrolling. . If there is no skip for each scan block of the display unit, the process proceeds to step S5, where the developed data is shifted by one dot and controlled to be turned on for one cycle in synchronization with the clock signal (CLK). And step S2
Return to

On the other hand, if there is a skip in each scan block of the display unit in step S4, the process proceeds to step S4.
Then, the process proceeds to step S10, in which one data from the RAM 114 is skipped and displayed so as not to be displayed for one cycle (one clock cycle). Then, the process returns to step S2.

An example of the control of reading the display data from the RAM 114 is shown in the lower part of FIG. In this case, the case indicated by △ indicates a case where skipping is performed and display is not performed for one cycle, and blanks are displayed as blanks as they are.

As described above, according to the second embodiment, the data is sequentially read out by the method shown in FIG.
By adopting a method of supplying data to the display unit, the interval between the scan lines is always constant, so that there is no expansion or contraction at the boundary between digits in the scroll display and no dot bleeding.

Even if the scanning speed is reduced (the scrolling speed is reduced), the same control can be used without any problem, and special fonts such as external characters as well as normal fonts can be handled without any change. Other display effects can be supported.

Also in the second embodiment, since the scanning is performed by the vertical line, the display does not look oblique at the time of horizontal scrolling, such as when scanning is performed by the horizontal line. In addition, since this function is realized by executing the control procedure stored in the ROM 113 by the control unit 112, there is no need to add a hardware configuration of the control board 110, and a display device equipped with a conventional control board Can be dealt with only by rewriting the control procedure of the ROM 113.

[0061]

As described above, according to the present invention, the interval between scan lines can be made constant, and there is no expansion or contraction or bleeding of dots at the boundary of digits in scroll display, and smooth and clear. Is possible.

Even if the scanning speed is reduced (the scrolling speed is reduced), the same control can be used, and special fonts such as external characters as well as normal fonts can be directly handled. And other display effects.

Further, since scanning is performed on vertical lines,
This makes it possible to perform a smooth and clear scroll display without causing the display to look oblique during horizontal scrolling such as when scanning with horizontal lines.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a display device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining scroll control in a state where “/” is displayed in the embodiment.

FIG. 3 is a flowchart illustrating scroll control according to the embodiment.

FIG. 4 is a diagram showing an example of a scan timing according to the embodiment.

FIG. 5 is a diagram showing a display state during actual scrolling when '/' is displayed in the present embodiment.

FIG. 6 is a flowchart illustrating scroll control according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a state of data developed in a display data storage area of a memory and a read state during scroll control according to the second embodiment;

FIG. 8 is a diagram illustrating an example of a driving method of a dynamic dot matrix LED display that performs vertical line scan control.

9 is a dynamic dot matrix L shown in FIG.
FIG. 9 is a diagram for explaining a scanning operation when one dot on the ED display is scroll-displayed from right to left.

10 is a diagram for explaining another scanning operation when one dot is scroll-displayed from right to left in the dynamic dot matrix LED display shown in FIG. 8;

FIG. 11 is a diagram illustrating an example of a driving method of a dynamic dot matrix LED display that performs horizontal line scan control.

12 is a diagram for explaining a scanning operation when one dot in the dynamic dot matrix LED display shown in FIG. 11 is scroll-displayed from right to left.

FIG. 13 is a diagram for explaining an interval between scan lines during the control of FIG. 10;

14 is a diagram for explaining a state recognized by a human when one vertical dot in the dynamic dot matrix LED display shown in FIG. 11 is scroll-displayed from right to left.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Display device 110 Control board 111 Interface circuit (I / F circuit) 112 Control unit 113 ROM 114 RAM 115 Power supply unit 160 Display unit A 170 Display unit B 180 Display unit C 200 Information processing device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-272340 (JP, A) JP-A-61-179491 (JP, A) JP-A-4-62589 (JP, A) 335057 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09G 3/32 G09G 3/20 G09G 5/34

Claims (9)

(57) [Claims] 1. A dynamic driving method dot matrix display having a plurality of scanning blocks, control the dynamic driving method dot matrix display
And a storage unit for storing a control procedure of the control unit , wherein the control unit includes the dynamic drive type dot matrix.
At the time of scrolling the display dots of the display unit, at the boundary between the scan blocks of the plurality of scan blocks , the display dots scrolled to the next scan block at the time of scrolling are stored in the storage means.
A display device, wherein a scroll display is performed after a predetermined time delay according to a control procedure . 2. The dynamic drive type dot matrix display uses a control signal capable of simultaneously selecting the same scan line of each scan block, and the energizing time of one scan line is always constant and the scan order is always constant. The display device according to claim 1, wherein the display order is a fixed order. 3. The dynamic drive type dot matrix display according to claim 1, wherein the same scan line of each of the scan blocks is cascaded, the energizing time of one scan line is always constant, and the scan order is always constant. The display device according to claim 1. 4. A delay of a predetermined time of a display dot of the control unit is a delay of one scan line cycle , and is performed at a boundary of a scan block during scroll display in a direction orthogonal to a scan line. The display device according to claim 2, wherein the display device is a display device. 5. One scan line of a display dot of the control unit.
When the display data is generated, at least one blank line is added to the original data to be displayed in at least one block in the scan line direction when the display data is generated.
5. The display device according to claim 4, wherein at the time of display control, at least one line is skipped for each scan block, and data is read while shifting sequentially, and output to the dynamic drive type dot matrix display. 6. A dynamic drive type dot matrix display having a plurality of scan blocks, and said dynamic
Control unit that controls the dot matrix display device
And a storage unit for storing a control procedure of the control unit, wherein the display control method includes the steps of: performing scrolling at a boundary between each of the plurality of scan blocks when scrolling display dots; Before the display dot scrolled to the next scan block , according to the control procedure stored in the storage means,
A display control method, wherein a scroll display is performed after a predetermined time is delayed by the control unit . 7. The display control of the dot matrix display of the dynamic drive system uses a control signal capable of simultaneously selecting the same scan line of each scan block, so that the energization time of one scan line is always constant and the scan control is performed. 7. The method according to claim 6, wherein the order is always fixed.
Display control method described. 8. A delay of the display dot for a predetermined time is one time .
8. The display control method according to claim 6, wherein a delay corresponding to a scan line cycle is performed at a boundary of a scan block during scroll display in a direction orthogonal to a scan line. 9. One scan line cycle of the display dots
When the display data is generated, at least one blank line is added to the original data to be displayed in the scan line direction at least one line in the scan line direction, and at least one line is read for each scan block during display control. 9. The display control method according to claim 8, wherein the method is performed by reading data while skipping and sequentially shifting the data and outputting the data to the dot matrix display of the dynamic drive system.