Traffic light countdown display device

Abstract

The utility model discloses a traffic light countdown display device, which relates to the technical field of traffic light control and comprises a ten-digit nixie tube module and a unit-digit nixie tube module, and the e section and the f section of the ten-digit nixie tube module are provided with driving circuits. The driving circuit comprises a numerical value comparison module and an analog switch module, and when the numerical value comparison module detects that the ten-bit nixie tube module is' 1 ', b and c sections of driving signals of the ten-bit nixie tube module are switched to e and f sections through the analog switch module; according to the utility model, the real-time response of digital identification is realized through hardware logic, the identification distance of ten-digit '1' can be greatly improved under typical working conditions, and the identification difficulty is reduced. In addition, the implementation cost is lower than that of a traditional module replacement scheme, and remarkable technical progress and economic benefits are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to traffic signal light control technical field especially relates to a traffic light countdown display device. BACKGROUND

[0002] In the traditional traffic light countdown display, the arrangement of the ten digits usually follows the right alignment rule (for example, when displaying "15", "1" is located on the right side and is adjacent to the unit "5"), which leads to too small spacing between the ten digits and the unit digits, and at 10-20 meters away, the driver may misjudge "15" as "5" (because "1" and "5" overlap in perception), and the reflection or glare further exacerbates the identification difficulty, affecting the brake or acceleration decision.

[0003] If the fixed spacing between the ten digits and the unit digits is simply increased, although the crowding problem of "1" and the unit digits can be alleviated, it will lead to too large spacing between other digits (such as "22") and display inconsistency; adding strokes of the digit "1" may damage the uniformity of the digit form, and the entire display module needs to be replaced, which is costly. Therefore, in view of the above phenomenon, a traffic light countdown display device is proposed, which adjusts the display position of the ten digits "1" to the left to increase the spacing with the unit digits, so as to meet the needs of actual use. SUMMARY

[0004] The utility model provides a traffic light countdown display device, which solves the problem of digit recognition in specific scenarios and improves traffic safety.

[0005] To solve the above technical problems, the utility model provides a traffic light countdown display device, which comprises a ten-digit nixie tube module and a unit-digit nixie tube module, the e and f segments of the ten-digit nixie tube module are provided with a drive circuit; the drive circuit comprises a value comparison module and an analog switch module; when the ten-digit nixie tube module is "1", the value comparison module detects the b and c segments of the ten-digit nixie tube module through the analog switch module to switch the drive signal to the e and f segments.

[0006] In some embodiments, the input end of the ten-digit nixie tube module is connected to a first decoder, the first decoder is used to convert the drive signal output by the analog switch module into a segment code control signal of the ten-digit nixie tube, and dynamically switch and compensate the e and f segments through the drive circuit.

[0007] In some embodiments, the value comparison module comprises a double operational amplifier circuit, which is used to detect the segment code input voltage of the ten-digit nixie tube module in real time, outputs a low-level trigger signal to the analog switch module when the ten-digit display value is "1", cuts off the b and c segments and turns on the e and f segments.

[0008] In some embodiments, the input terminal of the units digit display module is connected to a second decoder, which is cascaded with the first decoder to receive countdown data from the same external control signal and synchronously update the tens and units digit display values.

[0009] Compared with related technologies, the traffic light countdown display device provided by this utility model has the following beneficial effects:

[0010] This invention provides a traffic light countdown display device. This device achieves real-time response for digital recognition through hardware logic, significantly improving the recognition distance for the tens digit "1" under typical operating conditions, thus reducing the recognition difficulty. Furthermore, its implementation cost is more economical than traditional module replacement solutions, demonstrating significant technological advancements and economic benefits. Attached Figure Description

[0011] Figure 1 This is a schematic diagram illustrating the principle of this utility model;

[0012] Figure 2 This is a partial circuit diagram of the present invention.

[0013] The diagram is labeled as follows: 100, external signal; 200, second decoder; 300, units digit LED display module; 400, drive circuit; 401, numerical comparison module; 402, analog switch module; 500, first decoder; 600, tens digit LED display module. Detailed Implementation

[0014] Example 1

[0015] 1. Overall Structure

[0016] like Figure 1 As shown, the traffic light countdown display device includes:

[0017] 600 Ten-Digit LED Display Module: Uses a common-cathode 7-segment LED display, with its e and f segments (e.g., ...) Figure 2 (As shown) is connected to the drive circuit 400;

[0018] Units digit LED display module 300: Connected in parallel with tens digit LED display module 600, it displays the units digit of the countdown.

[0019] The driving circuit 400 consists of a numerical comparison module 401 (74HC85 comparator) and an analog switch module 402 (CD4066 chip);

[0020] The first decoder 500 and the second decoder 200 both use the SN74LS48 chip. After being cascaded, they receive the countdown data from the external control signal 100 (e.g., when the countdown is 30 seconds, the output is a BCD code with the tens digit "3" and the units digit "0").

[0021] 2. Driving circuit workflow

[0022] When the ten's place value of the countdown is "1" (for example, from "19" to "10" seconds):

[0023] Value comparison module 401: detects the ten's place segment code driving signal output by the first decoder 500 (if "1", the b, c segment corresponding pin voltage is high);

[0024] Trigger switching: the value comparison module 401 outputs a low level to the control end of the analog switch module 402, switching the b, c segment driving signal of the ten's place nixie tube 600 to the e, f segment, so that "1" is displayed on the left side, enhancing the recognition degree.

[0025] 3. Synchronous display control

[0026] The external control signal 100 sends the countdown data to the first decoder 500 and the second decoder 200 through the SPI interface, and the two decoders are cascaded to synchronously update the ten's place and the unit's place values;

[0027] For example: when the countdown changes from "20" to "19", the first decoder 500 outputs the segment code of the ten's place "1" (triggering the driving circuit 400 to switch the e, f segment), and the second decoder 200 outputs the segment code of the unit's place "9".

[0028] 4. Dynamic switching effect

[0029] Normal display: when the ten's place displays "2" to "9", the driving circuit 400 does not change the b, c segment current;

[0030] Special modification: when the ten's place displays "1", the b, c segment current is switched to the e, f segment.

[0031] The device realizes real-time response of digital recognition through hardware logic, and can greatly improve the recognition distance of the ten's place "1" under typical working conditions, reducing the recognition difficulty. In addition, the implementation cost is more economical than the traditional module replacement scheme, with significant technical progress and economic benefits.

Claims

1. A traffic light countdown display device comprising a ten's digit nixie tube module and a unit's digit nixie tube module, characterized in that: the e and f segments of the ten's digit nixie tube module are provided with a drive circuit; the drive circuit comprises a value comparison module and an analog switch module, and when the ten's digit nixie tube module is "1", the value comparison module detects and switches the b and c segment drive signals of the ten's digit nixie tube module to the e and f segments through the analog switch module. The input end of the ten's digit nixie tube module is connected to a first decoder, which is used to convert the drive signals output by the analog switch module into segment code control signals of the ten's digit nixie tube, and dynamically switch and compensate the e and f segments through the drive circuit. The value comparison module comprises a double operational amplifier circuit, which is used to detect the segment code input voltage of the ten's digit nixie tube module in real time, and when the ten's display value is "1", outputs a low-level trigger signal to the analog switch module to cut off the b and c segment drive and turn on the e and f segments.

2. The traffic light countdown display device according to claim 1, wherein, The input end of the unit's digit nixie tube module is connected to a second decoder, which is cascaded with the first decoder, receives the countdown data from the same external control signal, and synchronously updates the ten's and unit's display values.

3. The traffic light countdown display device of claim 1, wherein, ​ 4. The traffic light countdown display device of claim 2, wherein, ​

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