KR20010045148A - An expression module with error checking ability for electric light board - Google Patents

Abstract

PURPOSE: Disclosed is an indication module for electric bulletin board having trouble checkup function to detect malfunction of each luminous indication device regardless of lighting or lighting out indication device, especially to indicate necessary letter, sign or picture by lighting and lighting out numerous light emitted diode with matrix form arrangement. CONSTITUTION: The indication module for electric bulletin board having trouble checkup function consists of main controller to control fixed electric bulletin board; indication unit(220) to express necessary letter, sign or picture by providing electric current to luminous indication device(224) in accordance with fixed input signal; indication control part(210) to control motion of the indication unit in accordance with indication data and control signal applied from the main controller; electric current changing quantity detector(230) to detect changing quantity of electric current being provided to the indication unit(220); indication part power source device(240) to provide power source to the indication unit(220).

Description

An display module with error checking ability for electric light board}

The present invention relates to a display module for an electronic display panel and a method for inspecting an electronic display panel using the same. In particular, a display module for an electronic display panel for displaying a required character, symbol, or picture by arranging a plurality of light emitting diodes in a matrix form and turning off the dots and turning them off. It relates to a method of inspecting the used electronic sign.

In general, the electronic board is arranged to display information such as various symbols, letters, numbers, and pictures by arranging color light emitting diodes or small fluorescent tubes, which are semiconductor lamps, in a matrix form. Operate.

1 is a view showing the configuration of a general electronic sign system.

As shown in FIG. 1, the electronic display system includes a electronic display panel 100a formed by arranging a plurality of display modules 100 horizontally and vertically, and a main controller 210 including a PC for processing various data transmitted from the host computer 200. ), An interface controller 220 connecting the main controller 210 and the display control unit 110 of each display module 100, a modem 230 for communicating with the host computer 200, and the like.

Each of the display modules 100 includes a display unit 120 for displaying data transmitted from the main controller 210, a display controller 110 for controlling the display unit 120, and a display unit power supply 130 for supplying power. Etc. This will be described in more detail with reference to FIGS. 2 and 3.

2 is a block diagram illustrating an example of a conventional display module, and FIG. 3 is a front view of the display module.

As shown in FIG. 2, the display module 100 includes a display unit 120, a display control unit 110, and a display unit power supply 130. The display module 100 is connected to the interface controller 220 of the electronic display panel 100a described with reference to FIG. 1, and the display controller 110 controls the display elements 124a such as light emitting diodes in units of the display module 100. A microcontroller 111 for controlling, a data memory 112 for storing and processing various image data and error data, a luminance controller 113 for adjusting the luminance of each of red and green, and a temporarily storing display data The data latch 114, the luminance controller 113, the data latch 114, and the line transceiver 115 for transmitting the signals of the microcontroller 111 to the display unit 120 are configured.

The display unit 120 receives a line receiver 121 for receiving a signal from the display controller 110, a data latch pixel driver 122 for driving a pixel by receiving a signal from the display controller 110, and a current of the pixel. The display element 124a which emits light according to the limiting current limiting part 123 and the operating current of the data latch pixel driver 122 includes a display part 124 arranged in a matrix form. The arrangement of the display element 124a can be seen in detail with reference to FIG. 3.

The display unit power supply 130 is for supplying AC-DC conversion power to the display unit 124 formed of the light emitting display element 124a.

4A illustrates a display module in which letters are normally displayed, and FIG. 4B illustrates a state in which some display elements have failed.

As shown in FIGS. 4A and 4B, when some display elements 124a of the display module 100 do not operate normally, the display module 100 is displayed only as a “gi” even when trying to express “ga”. In some cases, it may not be possible to accurately communicate with a person who views the electronic display board 100a.

In general, the display panel 100a is manufactured so that letters are large and clearly displayed due to being installed at a position where a large number of people can see in a short time. As shown in FIG. 4B, when the display element 124a does not operate normally. The judgment of letters is difficult or there is a high possibility of misrecognition of letters.

In the conventional display board, a person visually checks in the field or stops the operation of the display board to check whether there is an abnormality of the display screen in the self-diagnosis mode. Accordingly, in the test mode for checking the abnormality of the display board, the display board flickered without the operation of the display board, and there was a high possibility that the visual disturbance such as discomfort or driving disturbance was caused by the viewer.

In order to solve such a problem, there is a circuit that has been developed and used in the past, but this is a leakage current flowing in each light emitting display device (a current having a smaller value than the operating current, a current of a small value that normally flows in the display device of the display panel). As it is judged whether the light emitting display device operates normally, the circuit becomes complicated and the circuit becomes complicated, and the measurement rate is not only incorrect according to the surrounding environment such as temperature and humidity as well as the failure rate is increased, and the manufacturing cost is increased and the manufacturing process is increased. Many problems, such as the increase of.

The purpose of the present invention is to solve the problems caused by the conventional method for measuring the display module and the light emitting display device of the conventional display board, whether the normal operation of the light emitting display device irrespective of the contents displayed on the display and whether the display device is turned off It is to provide a display module for an electronic display board that can be confirmed.

1 is a view showing the configuration of a general electronic sign system;

2 is a block diagram illustrating an example of a conventional display module;

3 is a front view of a display module;

4A illustrates a display module in which letters are normally displayed;

4B is a view showing a state in which some display elements have failed;

5 is a block diagram of a display module for an electronic display panel according to the present invention;

6 is a circuit diagram of the display unit and current variation detection means of FIG.

7 is a signal diagram for explaining a normal operating state of a light emitting display device;

8 is a signal diagram illustrating an abnormal operation state of a light emitting display device;

9A and 9B are front views of a display module for explaining an operation state inspection process of a light emitting display device;

10 is a flowchart illustrating a process of inspecting a light emitting display device in a display module for an electronic display panel according to the present invention;

11A and 11B are diagrams each illustrating another example of the current variation detection sensor.

Explanation of symbols on the main parts of the drawings

200: display module for the display board 210: display control unit

211: microcontroller 212: data memory

213: luminance controller 214: data latch

215: line transceiver 216: line receiver

220: display unit 221: line receiver

222: data latch pixel driver 223: current limiting unit

224: display unit 224a: light emitting display device

230: current variation detection means 231: line transceiver

232: waveform shaping unit 233: clamping circuit

234: current change detection sensor 240: display unit power supply

SUMMARY OF THE INVENTION An object of the present invention is a display module for a display panel having a main controller for controlling a predetermined display plate, the display unit for supplying a current to the light emitting display element in accordance with a predetermined input signal and displaying a required character, symbol or figure, the main Display control unit for controlling the operation of the display unit according to the display data and the control signal applied from the controller, current change amount detection means for detecting the amount of change of the current supplied to the display unit and display unit power supply for supplying power to the display unit It can be achieved by the display module for a display board comprising a.

The current change amount detecting means includes a current change detection sensor for detecting a change in current supplied to the display unit, a clamping circuit for suppressing an excessive signal output from the current change detection sensor, and an analog of the current change detection sensor input through the clamping circuit. It is preferable to have a structure including a waveform shaping unit for receiving a signal, removing a noise signal, and converting the signal into a digital signal, and a line transceiver for receiving a signal from the waveform shaping unit and applying the signal to a display control unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

5 is a block diagram of a display module for an electronic display panel according to the present invention, and FIG. 6 is a circuit diagram of the display unit and current variation detection means of FIG.

As can be seen in Figures 5 and 6, the display module for display board 200 according to the present invention receives the display data transmitted from the main controller for controlling the display board, stores the received data and displays the received display data display unit A display control unit 210 to be supplied to the 220, a display unit 220 which receives a signal from the display control unit 210, and displays it on the light emitting display device; a current change amount detecting unit 230 for detecting a change amount of current; And a display unit power supply unit 240 for supplying power to the display element.

As shown in the drawing, the display controller 210 controls the microcontroller 211 in charge of the control of the display module 200, a data memory 212 for storing display data and error data, and luminance data of the microcontroller 211. A luminance controller 213 for controlling the brightness of the light emitting display device, a data latch 214 for temporarily storing the display data, a line transceiver 215 for transmitting a signal, and a line receiver 216 for receiving error data And the like.

The microcontroller 211 receives data sent from the main controller, stores the received data in the data memory 212, supplies the received data to the display unit 220, and detects the current change detection means 230. The controller determines whether the light emitting display device operates, stores the determined data, and transmits error data according to a request of the host computer.

The luminance controller 213 controls the brightness of the light emitting display device according to the data transmitted from the microcontroller 211.

The data latch 214 stores the display data as 8-bit parallel data for quickly and accurately transmitting the display data to the display unit 220, and then transmits the parallel data to the display unit 220 according to the instructions of the microcontroller 211.

The line transceiver 215 supplies the display data and the control signal to the display unit 220 safely from noise.

The line receiver 216 serves to safely receive state data of the light emitting display device sent from the current change amount detecting means 230.

The display unit 220 stores a line receiver 221 for receiving a signal from the display controller 210 and a data latch pixel driver for storing display data sent from the display controller 210 and supplying current to the light emitting display device. 222, a current limiting unit 223 for limiting the current supplied to the light emitting display element, and a display unit 224 for displaying the expression data.

The line receiver 221 serves to safely receive the display data and the control signal sent from the display control unit 210. In addition, the data latch pixel driver 222 receives the display signal sent from the display control unit 210 and supplies an actual current to the light emitting display device, and controls the brightness of the light emitting display device by receiving the luminance signal sent from the brightness controller 213. do. The current limiting unit 223 serves to protect the light emitting display device from excessive current and allows the rated current to flow. The display unit 224 is a collection of light emitting display elements in which the light emitting display elements 224a are arranged in a matrix form. The display unit 224 expresses data received from the display control unit 210 using pictures, characters, and symbols so that a person can visually know. do.

The current change amount detecting means 230 detects the change amount of the current flowing through the display unit 224 and transmits the change amount of the current to the microcontroller 211 so that the operation state of the light emitting display device can be known and the line transceiver ( 231, waveform shaping unit 232, clamping circuit 233, current variation detection sensor 234, and the like. Here, a transformer was used as the current change detection sensor 234. The line transceiver 231 receives the signal from the waveform shaping unit 232 so that the display controller 210 safely receives the signal output from the waveform shaping unit 232. The waveform shaping unit 232 receives the analog signal detected by the current variation detection sensor 234, removes the noise signal, converts the analog signal into a digital signal, and converts the signal to recognize the signal in the microcontroller 211. The clamping circuit 233 protects the waveform shaping unit 232 from an excessive signal output from the current variation detection sensor 234 and suppresses a signal generated at a negative potential. The current change amount detecting sensor 234 detects a change amount of the current flowing through the display unit 224 and applies it to the clamping circuit 233.

The display unit power supply 240 converts the input AC power into DC power that can be used in the semiconductor and the light emitting display device, and also protects the semiconductor and the light emitting display device from noise introduced with the AC power. . The operation state inspection process of the light emitting display device in the display module for an electronic display according to the present invention will be described with reference to FIGS.

7 is a signal diagram illustrating a normal operation state of the light emitting display device, FIG. 8 is a signal diagram illustrating an abnormal operation state of the light emitting display element, and FIGS. 9A and 9B illustrate an operation state inspection process of the light emitting display element. The front view of the following display module.

Operation state inspection process of light emitting display device

Step 1: When data is transmitted from the main controller 211, the microcontroller 211 of the display controller 210 stores the received data in the data memory 212 and stores the image data stored in the data memory 212. Read and supply to the display unit 220 to complete the character as shown in Figure 9a.

Step 2: After the letter is completed as shown in FIG. 9A, the current value flowing through the point A in FIG. 6 becomes the point current value x in FIG.

At this time, since there is no change in current, the current does not flow to the point B of FIG. 6 as shown by the point b of FIG. 7.

Step 3: After the time t0 has passed, when the light emitting display device 224a 1-1 is turned on as shown in FIG. 9B in FIG. 9A, the current at the point A of FIG. 6 is equal to x 'as in the current of a0 of FIG. It increases by x'-x). In this case, a positive pulse is generated in the signal of point B of FIG. 6 as in the signal b0 of FIG. 7.

The point C signal of FIG. 6 is generated in a state in which a portion of the reference current or more is cut off as shown in FIG. 7.

The point D signal of FIG. 6 is converted into a digital signal as shown in FIG. 7 through the waveform shaping process of the analog signal c0 of FIG. 7.

When the d0 signal of FIG. 7 is generated through the above process, the microcontroller 211 determines that the light emitting display device 224a is operating normally.

Immediately after the current measurement, the light emitting display device 1-1 is turned off as shown in FIG. 9A. At this time, the signal at point A of FIG. 6 is reduced by (x'-x) from x 'to x as in a1 of FIG. At this point, a negative pulse is generated at point B of FIG. 6 as in b1 of FIG. 7.

The signal of point C of FIG. 6 is not generated by being clamped as in c1 of FIG. 7, and therefore, the signal of point D of 6 is not generated.

The light emitting display device 1-1 of FIG. 9A is turned on together with the light emitting display device 1-1 of FIG. 9B, and current measurement is completed. Then, the light emitting display device of FIG. It is not visible to the human eye because a series of processes are performed in extremely fast time (within 1μS).

In addition, since the measurement is performed in one of the many light emitting display elements 224a at a time in a short time, the operation of the light emitting display element can be confirmed without damaging the screen.

Step 4: The three-step process is performed from 1-1 to 1-16 and 2-1 to 2-16,. In the same manner, the light emitting display devices are measured by measuring the order from 16-1 to 16-16.

Step 5: If an error occurs in the light emitting display device in step 3, the light emitting display device 1-1 is not turned on.

Therefore, the current at the point A of FIG. 6 is not changed as is the current x of a0 of FIG.

In addition, the signal of point B of FIG. 6 does not generate a pulse like the signal b0 of FIG. 8.

The point C signal of FIG. 6 does not generate a signal as shown by c0 of FIG. 8.

The signal at point D of FIG. 6 also does not generate a signal like d0 of FIG. 8.

As such, when no signal is generated at d0 in FIG. 8, the microcontroller 211 determines that the LED does not operate normally due to an abnormality in the light emitting display device. Error data is transmitted to the main controller 211.

After the current measurement, return to the original screen immediately as in step 3.

Step 6: Even when an error occurs in the light emitting display device in step 5, the current flowing does not change even when the light emitting display device is always turned on, thereby obtaining the same result as in the description of step 5.

That is, the abnormality occurs in the light emitting display device through the process of steps 3 to 6, so that the abnormality can be checked even if the light emitting display device is always lit or always turned off.

10 is a flowchart illustrating a process of inspecting a light emitting display device in a display module for an electronic display panel according to the present invention.

That is, the microcontroller 211 of the display controller 210 checks whether new data has been received through an initialization process and stores the received data in the data memory 212 if there is any received data. A character, a symbol, or a picture is to be displayed on the display unit 224. During this process, the light emitting display element 224a is turned off or lights up for a very short time to detect whether there is a current change in the current change amount detecting sensor 234 at that moment. If a current is detected, it is determined to be normal operation. If a current is not detected, error data is generated and the signal is sent to the microcontroller 211. Then, the light emitting display device 224a may display the original data, and then perform inspection on the next light emitting display device.

11A and 11B are diagrams each illustrating another example of the current variation detection sensor.

FIG. 11A illustrates the use of the differential amplifier as the telephone change detection sensor 234. The voltage difference across the resistor R is measured and amplified to detect a current change and send a signal to the clamping circuit 233. FIG. The rest is the same as using the transformer described above.

11B illustrates that an analog / digital converter is used as the current change detection sensor 234. The voltage difference between the resistor R is measured and converted into a digital signal, and the signal is sent to the line transceiver 231 or the like. The rest is the same as using a transformer.

As can be seen from the above description, the display module for the display panel according to the present invention does not affect the original task of the display panel at all, and the display module is turned on or off, regardless of whether the display module is on or off. It makes it possible to accurately detect the presence or absence.

Claims (2)

A display module for an electronic display board comprising a main controller for controlling a predetermined electronic display board, A display unit for supplying a current to the light emitting display element in accordance with a predetermined input signal to display a required character, symbol or figure; A display control unit controlling an operation of the display unit according to display data and a control signal applied from the main controller; Current change amount detecting means for detecting a change amount of the current supplied to the display unit; And And a display unit power supply for supplying power to the display unit. The method of claim 1, wherein the current change amount detecting means includes a current change detection sensor for detecting a change in current supplied to the display unit, a clamping circuit for suppressing an excessive signal output from the current change detection sensor, and the clamping circuit. An electronic board comprising: a waveform shaping unit receiving an analog signal of the current change detection sensor input through the signal and removing the noise signal and converting the signal into a digital signal; and a line transceiver receiving the signal from the waveform shaping unit and applying the signal to the display control unit. Display module.