JP5014736B2 - Information display device - Google Patents

Description

  The present invention relates to an information display device for displaying an arbitrary character, figure, or the like by lighting a desired display element using a display unit in which a large number of display elements such as light emitting diodes are arranged in a matrix.

As a conventional information display device, for example, there is an invention disclosed in JP-A-6-308906. In the present invention, display data fetched into each shift register sent from the control circuit is returned to the monitoring circuit from the reverse direction, and the display unit including the failed shift register is detected by the CPU. Display is performed by sending an individual signal, disconnecting the failed display unit, and transferring display data excluding the display data for the failed display unit.
JP-A-6-308906

  By the way, a dynamic lighting method is becoming mainstream as a lighting method of a display unit because of a demand for performance enhancement and cost reduction of a light emitting diode (hereinafter simply referred to as an LED) in recent years. Here, the dynamic lighting method means that the LEDs arranged in the display unit are divided into n areas, and the divided areas are sequentially lighted at a constant cycle. Accordingly, the cost of the display element driving circuit can be reduced since 1 / n is sufficient.

  However, in the above-described dynamic lighting method, since it is necessary to switch display data at high speed, when lighting is performed after confirming the collation match of the display data as in the above-described invention, the human eyes Even if the afterimage effect is used, the displayed information appears to blink, and there is a problem that it is not suitable for displaying information while monitoring a failed display unit as an information display device.

  The present invention is intended to solve the above-described problems, and the object of the present invention is to control the display element of the display unit by the dynamic lighting method, and to reduce the cost, as well as failure due to data verification. An object of the present invention is to provide an information display device that can specify a unit at the same time while lighting display data on the display unit.

The information display device according to the present invention achieves the above-mentioned object, and the means of claim 1 includes a display element array in which a large number of display elements are arranged in a matrix, and a bidirectionally shiftable shift for capturing display data. A register, a latch circuit that stores display data captured in the shift register, a driver circuit that controls lighting of a corresponding display element in the display element array according to the display data stored in the latch circuit, and the shift A plurality of display units each incorporating a display element driving circuit comprising means for switching the input direction of the register, a display unit in which the shift registers in the display unit are connected in series, and a display element array of the display unit a display memory for storing display data, one of which the display unit is divided into n pairs The display data from the display memory is input to the set from one direction of the shift register at the time of dynamic lighting, and the display data of the display memory output from the other side of the shift register is collated with the monitoring circuit. The display circuit is turned on by the driver circuit, and when the shift register is switched, the display data is input to the other set of the display unit from the other side of the shift register when the light is dynamically turned on and to the monitoring circuit. It is characterized by comprising a control unit comprising a control circuit for lighting the display data of the previous cycle while the display data of the display memory output from one of the shift registers is collated .

According to a second aspect of the present invention, in the first aspect of the present invention, when it is determined that the comparison result of the monitoring circuit is inconsistent, the display of the faulty display unit is electrically disconnected from the wiring of the shift register of the faulty display unit. It is characterized in that display data is displayed by connecting display units before and after the unit .

  As described above, the present invention switches the transfer direction of display data from the display memory for each dynamic lighting cycle, and each time the switching is performed, the display data from the shift register stored in the previous cycle and the display data of the display memory are displayed. By illuminating the display element array while monitoring the respective monitoring data as monitoring data, it is possible to monitor the failed unit while performing dynamic lighting.

  In addition, when it is determined that the result of verification by the monitoring circuit is inconsistent, the display unit is displayed by separating the failed display unit, so the display data is compressed or changed in the display unit. It has an effect that display can be performed continuously.

  The present invention switches the display data transfer direction for each dynamic lighting cycle for a display unit equipped with a shift register capable of shifting in both directions, and the display data from the shift register stored in the previous cycle each time switching is performed. This is an information display device in which collation with display data of the display memory is performed while the display element is turned on.

Hereinafter, an embodiment of an information display device of the present invention will be described with reference to the drawings.
FIG. 1 is a circuit block of one display unit 1n in the display unit 1 , FIG. 2 is a circuit block of the display unit 1 and the control unit 2, and FIG. 3 is an explanatory diagram for explaining an operation state.

First, the configuration of the display unit 1n will be described. The display unit 1n includes a display element array 11 in which a large number of display elements are arranged in a matrix, and a display element driving circuit 12 that controls blinking of the display element array 11. ing. The display element driving circuit 12 synchronizes display data sent from the signal line S-IN via the control circuit 22 from the display memory 21 of the control unit 2 shown in FIG. 2 with a clock signal from the signal line CLK. A shift register 12a having a bidirectional shift function for fetching, a latch circuit 12b for storing display data fetched in the shift register 12a by a signal from the signal line LATCH, and the display according to the latched display data A driver circuit 12c for controlling lighting of a corresponding display element in the element array 11, analog switches 12d and 12d 'for disconnecting the shift register 12a, and signals from the AND circuit 12e and the signal line SHIFT are used for the shift register 12a. And an inverter 12f for switching the input direction. And the display unit 1n comprised from the display element array 11 and the display element drive circuit 12 is attached to a display board frame in matrix form, and becomes an information display apparatus.

Next, the control unit 2 for controlling the lighting of the display element array 11 in the display unit 1n and displaying characters and symbols will be described with reference to FIG.
The control unit 2 stores a display memory 21 for storing data to be displayed on the display unit 1n , display data from the display memory 21, an enable (ENABLE) signal, a latch (LATCH) signal, a clock (CLK) signal, and a shift (SHIFT). A control circuit 22 for sending a signal, an individual signal (DETOUR: detour signal for disconnection), display data returned from the control circuit 22 via the display units 11 , 12 ... 1n, and the display memory 21. Display data from the monitor switch 23 for comparing the display data as monitor data, the shift data SW for switching the display data D1 , D4 and the monitor data D2 , D3 by the SHIFT signal and the display data from the display memory 21 are 1 / 2 Consists of a CPU 24 that performs control for dynamic lighting To have.
In FIG. 2, the signal lines for the enable signal, clock signal, and individual signal in FIG. 1 are omitted.

Next, the operation of the circuit configuration described above will be described with reference to the flowchart of FIG. 3 and the timing chart of FIG. In the present embodiment, the case where dynamic lighting is performed every 1/2 area of the display unit (alternately controlled by odd and even columns) will be described. However, every area such as 1/4 and 1/8 is described. You may go to
First, when the display data from the display memory 21 by a command from the CPU24 is transmitted to the control circuit 22, the control circuit 22 is the display data of the 1/2 area of the shift switch SW from D1, D2 as D1 shown in FIG. 2 The data is transferred to the display unit 11 and latched by the latch circuit 12b (step S1).

Next, the display data from the switch the shift switch SW D3, D4 as D4 2/2 area is input to the shift register 12a is transferred to the display unit 1n, display data of the 1/2 area through D3 Are output to the monitoring circuit 23, and at the same time, the monitoring circuit 23 collates with display data of the display memory 21. At this time, the 1/2 area is turned on, and the display data of the 2/2 area stored in the shift register 12a is latched in the latch circuit 12b after being turned off (step S2).

Then, the display data from the shift switches SW is returned to its original position D1, D2 as D1 1/2 area enters the transferred shift register 12a to the display unit 11, the display data of the 2/2 area It is output to the monitoring circuit 23 via D2, and at the same time, the monitoring circuit 23 collates with the display data of the display memory 21. At this time, the 2/2 area is turned on, and the display data of the 1/2 area stored in the shift register 12a is latched in the latch circuit 12b after the light is turned off (step S3).

  When the operation of step S3 is completed, the CPU 23 determines whether or not to end the display of display data. If it is not the end, the process returns to step S2 and is repeated until it is determined that the display is ended (step S4). .

  In the above description of the operation, when the monitoring circuit 23 determines that the collation result of the monitoring circuit 23 in steps S2 and S3 is inconsistent, the failed display unit is detected, and then an individual signal is sent to the failed display unit to analog. The CPU 24 performs processing such as disconnecting the failed display unit with the switches SW12d and 12d 'and transferring display data excluding data corresponding to the failed display unit to perform display.

  In the above description of operation, display data and monitoring data can be read simultaneously by switching whether the memory address is counted up or counted down for each dynamic lighting cycle as shown in FIG. The monitoring circuit 23 can be supplied. That is, the state of the step S2 in which the display data of the 1/2 area is checked while transferring the display data of the 2/2 area corresponds to the count-up, and the 2/2 area is transferred while transferring the display data of the 1/2 area. Since the state of step S3 for collating the display data corresponds to countdown, the control data and the collation data can be handled easily.

It is a circuit block of one display unit in the information display device of the present invention. It is a circuit block diagram of an information display device. 3 is a flowchart for explaining the operation of the circuit block of FIG. 2. It is a timing chart figure for operation explanation. It is explanatory drawing which shows the data arrangement | sequence in a display memory.

Explanation of symbols

1 Display section
11 to 1n display unit 11 display element array 12 display element driving circuit 12a shift register 12b latch circuit 12c driver circuit 21 display memory 22 control circuit 23 monitoring circuit 24 CPU

Claims (2)

A display element array in which a large number of display elements are arranged in a matrix, a shift register capable of bi-directionally shifting to capture display data, a latch circuit for storing display data captured in the shift register, and a memory stored in the latch circuit A plurality of display units each including a driver circuit that controls lighting of the corresponding display element in the display element array according to the display data, and a display element driving circuit including means for switching the input direction of the shift register; A display unit in which the shift registers in the display unit are connected in series;
A display memory for storing display data to be displayed on the display element array of the display unit, and the display data from the display memory in one set obtained by dividing the display unit into n groups when the dynamic lighting is performed. The display circuit of the previous cycle is turned on by the driver circuit while collating with the display data of the display memory that is input from one direction of the shift register and output from the other of the shift register to the monitoring circuit, When the shift register is switched, the display data is input to the other set of the display unit from the other of the shift registers during dynamic lighting, and one of the shift registers is output to the monitoring circuit. control circuit for displaying data of the previous cycle performs lighting by the driver circuit while matching And a control unit that consists of,
An information display device comprising: If it is determined that the result of the verification of the monitoring circuit does not match, the shift register wiring of the failed display unit is electrically disconnected and the display units before and after the failed display unit are connected to display the display data. The information display device according to claim 1, wherein

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