JP2017151377A - Display method - Google Patents

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JP2017151377A
JP2017151377A JP2016035981A JP2016035981A JP2017151377A JP 2017151377 A JP2017151377 A JP 2017151377A JP 2016035981 A JP2016035981 A JP 2016035981A JP 2016035981 A JP2016035981 A JP 2016035981A JP 2017151377 A JP2017151377 A JP 2017151377A
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writing
main frame
display
subframe
lighting control
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Japanese (ja)
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松本 誠
Makoto Matsumoto
誠 松本
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日亜化学工業株式会社
Nichia Chem Ind Ltd
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Priority to JP2016035981A priority Critical patent/JP2017151377A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies
    • Y02B20/40Control techniques providing energy savings
    • Y02B20/42Control techniques providing energy savings based on timing means or schedule

Abstract

PROBLEM TO BE SOLVED: To equally maintain the number of repetitions of lighting control per one display command when a display command of the predetermined frequency is input from the outside.SOLUTION: A display method writes a plurality of display commands inputted from the outside in a memory by a predetermined writing frequency, and before the finish of the writing, repeatedly executes a lighting control following one display command previously written by the number of sub-frames that constitute the one main frame since starting until the end of one main frame, and after the finish of the writing, the display method repeatedly executes the lighting control following the display command having completed the writing by the number of sub-frames that constitute the other main frame between the start of the other main frame following one main frame and the finish. The display method measures a writing frequency, and the number of sub-frames that constitute one main frame between the main frames started after the measurement based on the measured writing frequency is made equal.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a display method.

  A display method is known in which lighting control according to a previously input display command is repeated unless a new display command is input (see Patent Document 1).

JP 2001-56660 A

  However, in the conventional display method described above, when a display command is input from outside at a predetermined cycle, there is a possibility that the number of repetitions of lighting control per display command may not be maintained equal.

  The above problem can be solved by, for example, the following means.

  A plurality of externally input display commands are written to the memory at a predetermined writing cycle, and before completion of the writing, lighting control according to one previously written display command is performed from the start to the end of one main frame. Are repeatedly executed for the number of subframes constituting the one main frame, and after the writing is completed, the lighting control according to the display command for which the writing has been completed is terminated from the start of the other main frame following the one main frame. A display method that is repeatedly executed as many times as the number of subframes constituting the other main frame until the measurement of the write cycle, and between the main frames started after the measurement based on the measured write cycle A display method in which the number of subframes constituting one main frame is made equal.

  According to the above display method, when the display command is input from the outside with a predetermined cycle, the number of lighting control repetitions per display command can be kept equal.

It is a figure which shows the structural example of the display system which concerns on Embodiment 1. FIG. It is a figure which shows a mode that a predetermined display is scrolled. It is a figure which shows a mode that a predetermined display is scrolled. It is a figure which shows a mode that a predetermined display is scrolled. It is a figure which shows a mode that a predetermined display is scrolled. It is a figure which shows a mode that a predetermined display is scrolled. It is a figure which shows a mode that a predetermined display is scrolled. It is a figure which shows a mode that a predetermined display is scrolled. It is a figure which shows a mode that a predetermined display is scrolled. 3 is a timing chart illustrating a display method according to the first embodiment. 10 is a timing chart illustrating a display method according to the second embodiment. 3 is a diagram illustrating a configuration example of a display device according to Embodiments 1 and 2. FIG. It is a timing chart explaining the display method concerning a comparative example.

[Display System 1 According to Embodiment 1]
FIG. 1 is a diagram illustrating a configuration example of a display system according to the first embodiment. As shown in FIG. 1, the display system 1 includes an external device 10 and a plurality of display devices 20. The external device 10 outputs a plurality of display commands to the plurality of display devices 20, respectively. The plurality of display devices 20 scroll the plurality of images A to H from the right to the left as shown in FIGS. 2A to 2H, for example, by performing lighting control according to the display command input from the external device 10. The movement of each image may be in units of one dot, or may be in units of a plurality of dots as in the present embodiment. The contents of the images A to H are not particularly limited.

  When the display device 20 completes the lighting control according to the previously input display command, if a new display command has been written to the memory, the display device 20 starts the lighting control according to the new display command. The lighting control is repeated according to the display command input in advance. Even when a plurality of display commands are written at a predetermined cycle, there is no agreement between the time during which the lighting control is repeated and the writing cycle, and the lighting control is repeated at the writing cycle. Is not limited. However, according to the display method to be described later, the number of repetitions of lighting control per display command is autonomously maintained. Therefore, the repetition duration of the lighting control according to one display command is maintained equal to or substantially equal to the writing cycle.

  The plurality of display devices 20 have a plurality of light emitting elements. In each display device 20, the plurality of light emitting elements are arranged so as to form a dot matrix of vertical n dots × horizontal n dots, for example. n is an integer of 2 or more. A power source is connected to each of the external device 10 and the plurality of display devices 20 to supply power.

[Display Method According to Embodiment 1]
FIG. 3 is a timing chart illustrating the display method according to the first embodiment. Reference numerals M1, M2, and M3 in FIG. 3 indicate three memories M1, M2, and M3. As shown in FIG. 3, the display method according to the present embodiment measures the writing period T1 of the display commands A to I and measures the main frame MFB starting after the measurement X1 based on the measured writing period T1. The number of subframes constituting one main frame is made equal between MFHs. In this way, after the measurement X1, the number of lighting control repetitions per display command is kept equal. Details will be described below.

(External device 10)
As described above, the display commands A to I are input to the display device 20 from the external device 10 outside the display device 20. The input method may be wired or wireless. A plurality of display commands A to I input from the outside are sequentially written in the memories M1 to M3 at a predetermined write cycle T1.

(Display instructions A to I)
The display commands A to I are data for commanding lighting control of a plurality of light emitting elements. In FIG. 3, a section to which a symbol such as “WRITE: A” or “WRITE: B” is attached indicates a section in which the display command A, the display command B, and the like are written in the memory. Further, a section with an S symbol immediately to the right of “WRITE: A” or “WRITE: B” indicates a section in which lighting control is performed according to the display command A, the display command B, etc. written in the memory. . One section S indicates that the lighting control is performed once, and a plurality of sections S indicates that the lighting control is repeated. As will be described later, each section to which S is attached is referred to as a subframe in this specification.

(Write cycle T1)
The plurality of display commands A to I are written into the memory at a predetermined write cycle T1. The write cycle T1 is, for example, not less than 10 ms and not more than 30 ms. When it is less than 10 ms, the display time of each image is shortened, so that each image is switched quickly. On the other hand, when it exceeds 30 ms, the display time of each image becomes long, so that switching of each image is slow. Therefore, in the range of less than 10 ms or more than 30 ms, the difference in display time of each image is not noticeable. As will be described later, the display time for each image is equal to the length of each section labeled MFA to MFH in FIG.

(Memory M1, M2, M3)
The plurality of display commands A to I may be alternately written in the two memories M1 and M2, but as shown in FIG. 3, it is preferable that the display instructions A to I are sequentially written in the three memories M1, M2 and M3. In this way, when writing of the display command to the first memory is completed, writing of a new display command to the third memory is immediately started even if the second memory is in use. be able to. Therefore, the write cycle T1 can be shortened.

(Lighting control)
Lighting control refers to control for lighting a predetermined light emitting element among a plurality of light emitting elements. As described above, in FIG. 3, lighting control is performed in accordance with the display command A and the like written in the memory in a plurality of sections to which S is attached immediately to the right of the section to which “WRITE: A” is attached. Indicates that it is repeated several times.

(Main frame MFA to MFH, subframe S)
In FIG. 3, a section labeled MFA to MFH indicates a main frame. The main frame is a section where one image is displayed. For example, the main frame MFA is a section in which the image A is displayed, and the main frame MFB is a section in which the image B is displayed. The length of one main frame is the display time of one image. The lengths T1, T2, T3, and T4 of the main frame are, for example, 5 ms or more and 50 ms or less.

  In FIG. 3, a section labeled S indicates a subframe. A subframe is a section from the start to the end of one lighting control. The main frame is composed of a plurality of sub frames. The number of sub-frames constituting one main frame is equal to the number of times lighting control according to one display command is repeated. The lengths T5, T6, and T7 of the subframe are, for example, 50 us or more and 500 us or less. When the subframe is short, it is possible to suppress the shadowing. The lengths of the plurality of sub-frames constituting one main frame are substantially equal to each other in the main frame.

(Repetition of lighting control)
The display device 20 repeats the lighting control according to the previously written display command unless the writing of a new display command is completed. In other words, the display device 20 configures the one main frame between the start and the end of one main frame for lighting control according to the one display command written before the completion of the writing of the new display command. Repeatedly execute for the number of subframes to be executed, and after the writing of a new display command is completed, the lighting control according to the new display command for which writing has been completed is performed from the start to the end of the other mainframe following one mainframe. This is repeatedly executed for the number of subframes constituting the other main frame. As a result, in the present embodiment, the lighting control according to the display command A is repeated seven times, and the lighting control according to the display commands B to H is repeated three times.

(Measurement X1)
In FIG. 3, symbol X1 indicates that the measurement of the write cycle T1 is being performed. The measurement X1 can be performed, for example, by measuring the length from the end of writing of one display command until the end of writing of one subsequent display command. Further, for example, it can be performed by measuring the length from the start of writing of one display command to the start of writing of one subsequent display command.

  The display device 20 operates after the measurement X1 so that the number of subframes constituting one main frame is equal between the main frames started after the measurement X1. For example, after the measurement X1, the display device 20 calculates the subframe length T6 based on the measured writing cycle T1, and starts the mainframe after the measurement X1 in the subframe having the calculated length T6. Configure the MFB. Here, the length T6 of the subframe is a length in which the number of subframes constituting one main frame is equal between the main frames MFB to MFH started after the measurement X1. That is, the subframe length T6 is a length in which each of the main frames MFB to MFH has the same number of subframes.

  Such a length can be calculated based on, for example, “subframe length T6 × number of subframes≈write cycle T1”. For example, when the measured write cycle T1 is 15 ms, the length of the subframe is set to 3.0 ms and the number of subframes is set to 5 based on the write cycle T1. In this way, each time the lighting control according to the previously input display command is repeated five times, a new display command is written in the memory, and therefore the number of repetitions of the lighting control per display command is equal to 5. Maintained at times. Therefore, the repetition duration of the lighting control according to one display command can be maintained equal to or approximately equal to the writing cycle (15 ms).

  From the viewpoint of reducing flicker, it is preferable that the length of the subframe is short. Therefore, each display device 20 stores, for example, a value V1 in advance as the length of the subframe that is the minimum value, and first, a value V1 × M (M is an integer of 2 or more) obtained by multiplying the value V1 by an integer. ) Coincides with the measured writing cycle T1, or if not coincident, it is determined how much difference there is. When the value V1 × M and the writing cycle T1 match or do not match, but the difference between them is smaller than a predetermined value, the value V1 is used as the length of the subframe in the next main frame. On the other hand, when the two do not match and the difference is larger than a predetermined value, the same operation as described above is performed using the value V2 obtained by adding the predetermined value to the value V1. If an appropriate subframe length cannot be determined using the value V2, then the same operation is performed using a value V3 obtained by adding a predetermined value to the value V2. By repeating such an operation, an appropriate subframe length is finally determined.

  The calculated length of the subframe is preferably a length in which writing is completed near the center of the subframe scheduled when writing is completed. With this configuration, even if there is a difference between the timing at the completion of writing and the timing at the end of the subframe, the timing at which the writing is completed can be kept within a predetermined subframe scheduled at the completion of the writing. it can. That is, for example, when writing is completed near the end of the subframe scheduled when writing is completed, if there is a difference between the timing when writing is completed and the end of the subframe, writing completion is scheduled when writing is completed. In other words, the subframe is not within the subframe, but is shifted to a subframe adjacent to the subframe. Therefore, the number of lighting control in each main frame MFB to MFH is different. However, according to the above configuration, the writing is completed near the center of the predetermined subframe scheduled when the writing is completed, that is, at a timing away from the end of the predetermined subframe. Even when the shift occurs, the timing of completing the writing can be kept within the predetermined subframe. Therefore, the number of lighting controls can be maintained with higher accuracy.

(Measurement X2 to X8)
Symbols X2 to X8 in FIG. 3 indicate that the writing cycle T1 is newly measured every time a new display command is written after the measurement X1. The display device 20 also has the same number of subframes constituting one main frame between the main frames started after the measurement X2 to X8 after the measurement X2 to X8, as in the case of the measurement X1. Works like this. In this case, every time writing of a new display command is completed, the display device 20 newly calculates the length of the subframe based on the newly measured writing cycle, and measures the subframe with the newly calculated length. It is preferable to construct a mainframe that starts later. In this way, each time a new display command is written, the length of the subframe is adjusted so that the timing of writing and the timing of lighting control do not deviate. Therefore, the subframes constituting one main frame are adjusted. The number of frames can be kept equal.

(Display time of images B to H)
According to the display method described above, the number of subframes constituting one main frame is three after the measurement X1. That is, the number of repetitions of lighting control per display command is all three. Therefore, the display time of the images B to H is T3 or T4 as follows.
(1) Display times of images B, C, E, F, and H = T3 = T6 × 3 times (2) Display times of images D and G = T4 = T7 × 3 times Here, T6 and T7 are as described above. For example, since it is 50 us or more and 500 us or less, the difference between T3 and T4 is only 45 ms at the maximum. Therefore, the images B to H are smoothly switched with little backlash. Therefore, each of the plurality of display devices 20 can smoothly scroll the plurality of images B to H from the right to the left with less rattling.

  As described above, according to the display method according to the present embodiment, when a display command is input from the outside in a predetermined cycle, the number of repetitions of lighting control per display command is maintained autonomously. . Accordingly, the repetition duration of the lighting control according to one display command can be maintained equal to or approximately equal to the writing cycle.

[Display Method According to Second Embodiment]
FIG. 4 is a timing chart for explaining a display method according to the second embodiment. As shown in FIG. 4, in the second embodiment, after the measurement X1, the number of subframes constituting one main frame becomes equal between the main frames started after the measurement X1, based on the measured writing cycle T1. As described above, the second embodiment is different from the first embodiment in that a scheduled subframe is paused when writing is completed. In this way, the number of subframes constituting one main frame can be made equal between main frames started after the measurement X1 by simple control of stopping the lighting control. The length of one subframe is T10, and the number of subframes constituting one main frame is two. Therefore, the length of one main frame is T9 (T9 = T10 × 2).

  The lighting control pause times T11 to T16 are preferably equal to or shorter than the subframe length T10. The pause times T11 to T16 are times until the lighting control according to the display command input after the next display command is started after the lighting control is paused. In this way, since the lighting rate does not drop extremely, a reduction in brightness can be suppressed. In addition, when writing is stopped, the time during which the display remains off can be shortened.

[Display method of comparative example]
FIG. 6 is a timing chart for explaining a display method according to a comparative example. In the comparative example, the measurement of the writing cycle T1 is not performed. Further, the number of subframes constituting one main frame is not equalized based on the writing cycle T1. Therefore, the main frames MFA to MFD and MFF to MFH for displaying the images A to D and the images F to H are configured by three subframes, but the main frame MFE for displaying the image E is configured by two subframes. Is done. Therefore, the display time T20 of the images A to D and the images F to H and the display time T21 of the image E are greatly different. For this reason, the switching from the image E to the image F indicated by the reference sign Z appears to be largely blurred.

[Configuration Example of Display Device 20 According to Embodiments 1 and 2]
FIG. 5 is a diagram illustrating a configuration example of the display device according to the first and second embodiments. As shown in FIG. 5, the display device 20 includes a plurality of light emitting elements L1 to L4, common lines COM1 and 2 connected to one ends of the plurality of light emitting elements L1 to L4, a power supply V, and common lines COM1 and COM2. And the first switches SW11 and SW12 connected to the power source V, the plurality of drive lines SEG1 and SEG2 connected to the other ends of the plurality of light emitting elements L1 to L4, and the plurality of drive lines SEG1, 2 and GND. A plurality of second switches SW21 and SW22 to be connected and a control device CTR for controlling lighting of the plurality of light emitting elements L1 to L4 are provided. Details will be described below.

(Multiple light emitting elements L1 to L4)
For example, a light emitting diode can be used for each of the plurality of light emitting elements L1 to L4. For example, when configuring a dot matrix of vertical n dots × horizontal n dots, n × n light emitting elements are used. n is an integer of 2 or more. In this embodiment, for ease of understanding, n = 2 and four light emitting elements are used. For example, when one dot is configured using three light emitting elements (a red light emitting element, a green light emitting element, and a blue light emitting element), 3n × 3n light emitting elements may be used.

(Common line COM1, 2)
The common lines COM1 and 2 are connected to one ends of the plurality of light emitting elements L1 to L4. The plurality of light emitting elements L1 to L4 may be connected to the common lines COM1 and 2 at the common anode as shown in FIG. 5, or may be connected to the common lines COM1 and 2 at the common cathode.

  The common lines COM1 and COM2 can be formed in various shapes such as a linear shape, a square shape, and a circular shape on a printed wiring board or the like. The term “line” is not intended to limit the actual shape of the common lines COM1 and 2 formed on the printed wiring board or the like to a linear shape, but simply when the common lines COM1 and 2 are schematically illustrated in the circuit diagram. This is only because it can be displayed as a line.

  The number of common lines may be one or more. One common line may be branched in the middle, that is, branched. Even if one common line is branched, a dot matrix of vertical n dots × horizontal n dots by a plurality of light emitting elements L1 to L4 can be configured.

(Power supply V)
The power supply V is a device that supplies a voltage to the plurality of light emitting elements L1 to L4. The power supply V may be provided for each of the common lines COM1 and 2, but may be shared by a plurality of common lines COM1 and COM2 as shown in FIG. When the power supply V is shared by the plurality of common lines COM1 and 2, the voltage of the power supply V may be applied to each common line COM1 or 2 at all times (static control method) or may be applied in a time division manner. (Dynamic control method). As the power source V, for example, a DC constant voltage source such as a series system or a switching system can be used.

(First switch SW11, 12)
The first switches SW11 and SW12 are connected to the common lines COM1 and COM2 and the power supply V. The first switches SW11 and SW12 are turned on and off by the control device CTR. When the first switches SW11 and SW12 are turned on, the plurality of common lines COM1 and COM2 are electrically connected to the power source V, and when they are off, the connection is released. For the first switches SW11 and SW12, a P-channel FET (Field Effect Transistor) or a PNP transistor can be used. If the number of common lines is one, or if it is a static control method in which the voltage of the power supply V is always applied to each common line, although it is two, it is necessary to provide the first switches SW11 and SW12. Absent.

(Multiple drive lines SEG1,2)
The plurality of drive lines SEG1 and SEG2 are connected to the other ends of the plurality of light emitting elements L1 to L4. For the plurality of drive lines SEG 1 and 2, for example, copper foil made of a part of the wiring of the printed wiring board is used.

(Second switch SW21, 22)
The second switches SW21 and SW22 are connected to a plurality of drive lines SEG1 and SEG2 and GND (ground). The second switches SW21 and SW22 are turned on / off by the control device CTR. When the second switches SW21 and SW22 are on, the drive lines SEG1 and SEG2 are electrically connected to the GND. When the second switches SW21 and SW22 are off, the connection is released. For the second switches SW21 and SW22, an NPN transistor, an N-channel FET (Field Effect Transistor) or the like can be used. The magnitude of the current flowing through the drive lines SEG1 and SEG2 can be controlled by, for example, an element such as a resistance element or a device such as a constant current source device. These elements and devices can be provided between the second switches SW21, 22 and GND, between the second switches SW21, 22 and the drive lines SEG1, 2.

(Control device CTR)
The control device CTR includes a calculation unit P and a plurality of memories M1 to M3. The calculation unit P is configured by an FPGA (Field Programmable Gate Array), a microcomputer, or a combination of these.

  Each of the memories M1 to M3 is composed of one RAM (Random Access Memory) or one area of one RAM. Display commands input from the outside are written to the memories M1 to M3 as needed.

  The memory M4 includes a ROM (Read Only Memory). A program for operating the calculation unit P is written in the memory M4 in advance. The display device 20 operates when the calculation unit P executes the program stored in the memory M4.

  The time of lighting control per time means time spent for execution of lighting control. In the case of the static control method, the operation of turning on or off one or both of the second switches SW21 and SW22 corresponds to lighting control, and the time spent for the operation corresponds to the time of lighting control per time. In the case of the dynamic control method, the operation of turning on or off one or both of the second switches SW21 and 22 while applying a voltage to the common lines COM1 and 2 in a time-sharing manner corresponds to the lighting control and is spent for the operation. Time corresponds to the time of lighting control per time.

  Although the embodiments have been described above, these descriptions do not limit the configurations described in the claims.

DESCRIPTION OF SYMBOLS 1 Display system 10 External apparatus 20 Display apparatus L1-L4 Light emitting element COM1, 2 Common line SEG1, 2 Drive line V Power supply SW11, 12 1st switch SW21, 22 2nd switch CTR Control apparatus P Calculation part M1 Memory M2 Memory M3 memory M4 memory T1 Write cycle T2 to T4, T8, T9 Display time T5 to T7, T10 Time of lighting control per time T11 to T16 Pause time X1 to X8 Measurement

Claims (7)

  1. A plurality of externally input display commands are written to the memory at a predetermined write cycle,
    Before completion of the writing, the lighting control according to the one display command written earlier is repeatedly executed by the number of subframes constituting the main frame from the start to the end of the main frame, and the writing is performed. After completion of the above, the lighting control according to the display command for which the writing has been completed is repeatedly executed by the number of subframes constituting the other main frame between the start and end of the other main frame following the one main frame. Display method,
    Measuring the writing period;
    A display method for equalizing the number of subframes constituting one main frame between main frames started after the measurement based on the measured writing cycle.
  2. Calculate the length of the subframe based on the measured writing period,
    Configuring a mainframe that starts after the measurement in the subframe of the calculated length;
    The display method according to claim 1.
  3. Calculate the length of the subframe based on the measured writing period,
    Configure a mainframe that starts after the measurement in the subframe of the calculated length;
    The calculated length of the subframe is a length at which the writing is completed near the center of the subframe scheduled when the writing is completed.
    The display method according to claim 1.
  4. Each time a new display command is written, the subframe length is calculated based on the measured writing cycle,
    Configuring a mainframe that starts after the measurement in the subframe of the calculated length;
    The display method according to claim 1.
  5.   2. The subframe scheduled at the completion of the writing is paused so that the number of subframes constituting one main frame becomes equal between mainframes started after the measurement based on the measured writing cycle. Display method described in.
  6.   The display method according to claim 5, wherein a pause time of the lighting control is equal to or shorter than a length of the subframe.
  7. The display method according to claim 1, wherein the writing cycle is 10 ms or more and 30 ms or less.
JP2016035981A 2016-02-26 2016-02-26 Display method Pending JP2017151377A (en)

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