JPS62279396A - Display controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a display control device used in, for example, a card-type lighting device for controlling illuminating lights.

[Conventional technology]

Conventionally, for example, in card-type lighting devices that control lighting lights,
By having a motor-driven card league read a magnetic card with the degree written on it, the lamp is turned on by the amount of degree. This device displays the remaining time of the card that can use the illumination light and the current time using a display section using a segment type LED 51 and a dot LED 52 as shown in FIG. The display control device installed in such a card-type lighting device is such that when the illumination lamp is in use, the display section shows the current time (Fig. 4(a)) and the remaining time (Fig. 4(b)).
)), but when the lighting is not in use, the current time is displayed, but the remaining time is not displayed. At this time, L
In consideration of the lifespan of the ED and power saving, the two dot LEDs for displaying the remaining time are also turned off.

By the way, in the conventional display control device, the segment type L is used to turn off the two dot LEDs for displaying the remaining time.
A display LSI is used to control the lighting of the ED. In other words, the conventional display control device focuses on the fact that the display LSI can control eight segments, and uses the remaining one that is not in use when controlling the lighting of a segment type LED consisting of seven segments. This controls the lighting of two dot LEDs for displaying the remaining time.

[Problem that the invention seeks to solve]

In conventional display control devices, the display LS controls the lighting of segment type LEDs used to display the current time and remaining time.
Since the lighting of the dot LED is controlled by I,
To avoid adversely affecting the current time display and remaining time display,
This has the disadvantage that not only a special port must be arranged, but also the program for controlling the display LSI becomes complicated.

The present invention has been made based on the above circumstances, and it is possible to control the lighting of dot LEDs used to display the date and time without using a special port and with a simple circuit. The object of the present invention is to provide a display control device.

[Means for solving problems]

FIG. 1 is a block diagram of a display control device according to the present invention. In the figure, 1 indicates a segment type LED 1a and a door/
2 is a display control means for dynamically lighting the segment type LED 1a of the display means 1 and the dot LED 1b; 3 is a display control means having a signal from the display control means 2; Segment type LE
The KM moving means 4 receives the signal from the display control means 2, and lights up each segment of D1a.
finger driving means for sequentially lighting up the segment-shaped LEDs 1a;
5 is a detection means that detects that the segment drive means 3 is operating and issues a signal, and 6 is a dot drive means that lights up the dot LED 1b in response to the signal from the detection means 5.

[Effect]

Display control means 2 is Raku! (2) A signal is issued to the Φh year setting 4, and each segment of the segment type LED 1.2 of the digit to be driven is lit up via the segment driving means 3.

Next, a signal is sent to the finger driving means 4 to move the digit to be driven,
Each segment of the segment type LED 1a is turned on again via the segment driving means 3. Thereafter, the digits to be driven sequentially are switched by the finger driving means 4, and the segment type LED 1 is
Dynamically lights up a.

By the way, when the display control means 2 turns on the segment type LEDla, the detection means 5 detects this and issues a signal to the dot drive means 6. When the dot driving means 6 receives this signal, it lights up the dot LED Ib. Furthermore, when the segment type LED 1a is not lit, no signal from the detection means is sent to the dot driving means.
The dot driving means 6 turns off the dot LED 1b.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. FIG. 2 is a circuit diagram showing a display control device used in a card-type lighting device according to an embodiment of the present invention. In the figure, 10 is a display unit having a remaining time display unit 10a and a current time display unit 10b that are displayed using segment type LED II, 12 is a display control LSI that dynamically lights up the segment type LED II, and 13 is a segment type LE.
Buffer for Dll, 14 is a segment drive unit that lights up the seven segments of the segment type LED II in response to a signal from the display control LS112, 15 is a display control L
By the signal from S112, each segment type LED11
A to llh are finger drive units for sending the output of the corresponding segment drive unit 14, 17 and 18 are dot LEDs that display the current time dot, and 19 is a cathode connected to the common cathode terminal Ka of the segment type LED 11a. The anode is connected to one end of the resistor R6, and the dot LED 20 displays the remaining time dot.The cathode is connected to the dot LED 1.
9 and the common cathode terminal Ka of the segment type LED 1.1a, the anode is connected to one end of the resistor R7, and the dot LED D displays the remaining time dot.
I is a diode whose anode is connected to the collector of the transistor Tr3 of the segment driving section 14c which drives the C segment, and whose cathode is connected to one end of the resistor R3, and D2 is the segment driving section 14 whose anode drives the B segment.
This is a diode whose cathode is connected to the collector of the transistor Tr2 of b and to one end of the resistor Rq. Note that Tr is a transistor, R is a resistor, and K is a common cathode terminal of the segment type LED.

Moreover, FIG. 3 is an enlarged view of the segment type LED, and in the figure, A to G are each segment of the segment type LED.

Next, the operation of the circuit configured as described above will be explained. Suppose that the user of the lighting device inserts a card with 12 hours and 17 minutes remaining into a card-type lighting device (not shown).

Then, the card league (not shown) shows the remaining card time 1.
It reads 2 hours and 17 minutes and sends that signal to the display control LSI 12.

When the display control LS 112 receives this signal, it first sends a signal to the finger drive unit 15, and sends an L signal to the common cathode terminal Ka of the one-digit segment type LEDlla that displays the "minute" on the remaining time display 10a. Segment type LED1
1a can be turned on. At the same time, a signal is sent to the segment drive unit 14a14b14c14f via the buffer 13, and the transistors Tr, -Trz, Tr,
・Turn on Tr, and turn on segment type LED 11.
The A segment, B segment, C segment, and F segment of a are lit to display "7".

Next, the display control LS+12 sends a signal to the (?te) drive unit 15, and sends an L signal to the common cathode terminal Kb of the 10-digit segment type LED 1lb that displays the "minute" of the remaining time display 10a. , puts the segment type LE011b into a state where it can be lit.At the same time, a signal is sent to the segment drive units 14a and 14b via the buffer 13, turning on the transistors Tr and Tr2, and turning on the A segment and the B segment of the segment type LED 11b. Lights up and displays "1".In the same way, lights up the segment type LEDIIC/lid for "hour" display and displays "12".
Display.

By the way, 1. for display control. When the S I 12 is displaying the remaining time, either the A segment or the B segment of the segment type LED 11a that displays the 1 digit of the minute is always lit. That is, the display control LS I l 2
When is displaying the remaining time, segment drive unit 1
The segment drive unit 4a or the segment drive unit 14b is always in operation, and the transistor Tr or the transistor Tr is always in an on state.

Therefore, at least one of the diode D1 and the diode D2 is always in the on state.

As a result, the voltage (2) is applied to the dot LP and D19 and D20, so the dot LEDs 19 and 20 light up. In this way, the remaining time display 10a displays "12:17J."

However, when the display control LS 112 turns off the remaining time display, such as when the user takes out the card from the card-type lighting device, the segment drive section movement section 14a and the segment drive section 14b do not operate. First, the transistors Tr, and the transistors Trz are also in an off state. Therefore, the diode D1 and the diode D2 are also in the off state, and the dot LEDs 19 and 2 are in the off state.
Since no voltage is applied to 0, dot LED 19.
20 is turned off at the same time as the "hour" and "minute" remaining time displays are turned off.

In addition, the segment type LEDlle of the current time display section 10b
~llh is also dynamically lit in the same way as above to display the time. In addition, since the current time display section 10b is always lit when the card type lighting device is powered on, the voltage of the dot LEDs 17 and 18 of the current time display section Ob is also reduced by resistors R1° and R11. A voltage V is applied to the lamp so that the lamp always lights up when power is applied to the device.

According to the above embodiment, there is no need to provide a special port to control the lighting of the dot LED used to display the remaining time, and no program is required to control the dot LED. There is no need to complicate the control program for the display control LSI.

Furthermore, according to the above embodiment, the detection means only needs to detect the lighting of two segments out of the seven segments of the segment type LED. Configuration becomes easier.

In the above embodiment, the B segment and C segment were used to detect the lighting of the segment type LED.
This may be any combination of two segments, one of which is lit among the seven segments of the segmented LED.

〔Effect of the invention〕

As explained above, according to the present invention, the lighting of the dot LED used when displaying the date and time is controlled by detecting the lighting of the segment type LED, without using a special port. A display control device that can be controlled by a simple circuit can be provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a display control device according to the present invention, and FIG.
The figure is a circuit diagram showing a display control device used in a card-type lighting device which is an embodiment of the present invention, and FIG. 3 is a segment type LE
It is an enlarged view of D. FIG. 4 is a diagram showing a display section used in a card-type lighting device, etc., in which FIG. 4(a) shows a display section for the current time, and FIG. 4(b) shows a display section for remaining time. DESCRIPTION OF SYMBOLS 1... Display means, 2... Display control means, 3... Segment drive means, 4... Finger drive means, 5... Detection means, 6... Dot drive means, 11... Segment type LED, 17~20... Dot LED, Tr
... Transistor, D+'Dt...Diode,
R1...Resistance. Applicant: i-Writing System Co., Ltd.

Claims (4)

[Claims] (1) a display means having a plurality of segment type LEDs and a dot LED; a display control means for dynamically lighting the plurality of segment type LEDs and the dot LED; Segment driving means for driving each segment of the segment type LED, and digit driving means for receiving a signal from the display control means to sequentially switch and send the output of the segment driving means to each of the plurality of segment type LEDs. , in a display control device that displays date and time, the segment type L
A detection means that detects that the ED is lit and issues a signal, and a dot L when there is a signal from the detection means.
A display control device comprising: dot drive means for turning on the LED and turning off the dot LED when there is no signal from the detection means. (2) The detection means emits a detection signal when any one of the segments of the segment type LED is lit. Display control device. (3) The detection means selects two segments from among the segments of the segment type LED, one of which is always lit when displaying the date or time, and at least one of the two segments is selected. 2. The display control device according to claim 1, wherein the display control device emits a detection signal when one of the segments is lit. (4) The detection means detects when the segment driving means for lighting the segments is operating and issues a signal.
The display control device described in Section 1.