JPH0851650A - Self-diagnostic display device - Google Patents

Abstract

PURPOSE:To provide an LED display device for clearly demonstrating abnormal parts even without referring to screen display at the time of performing repairs in an electric provided with a self-diagnostic function for preventing disasters when operation abnormality is generated. CONSTITUTION:This self-diagnostic display device is composed of the various kinds of sensors 14 for detecting the dangerous state of respective parts, a microcomputer 12, plural laser light emitting diodes (LEDs) 18, 20 and 23 for displaying the abnormal parts, transistors 19, 22 and 25 as plural LED driving circuits, resistors 18, 21 and 24, the switching buttons 26-28 of a display layer for effectively utilizing the small number of the LEDs even when diagnostic items become many and a reset switch 29 for returning from a low-order layer to a first layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of automatically determining the cause of an abnormality and displaying the content thereof in order to prevent danger when an abnormality occurs inside the equipment such as a television receiver. A possible self-diagnosis display device.

[0002]

2. Description of the Related Art In recent years, many electric devices represented by television receivers have a self-diagnosis function for preventing a disaster or the like due to an abnormality occurring inside the device.

An example of the above-described conventional self-diagnosis display device will be described below with reference to the drawings. FIG. 3 shows a conventional self-diagnosis display device of a television receiver. In FIG. 3, as components, 1-3 are main processing IC1 to IC3 inside the television receiver. Four
Is a microcomputer for controlling the main processing IC1 to IC3. Reference numeral 5 is a control bus line for transmitting from the microcomputer 4 to the main processing IC1 to IC3, and IIC or the like can be given as an example. Reference numeral 6 is an on-screen display for generating screen display characters, 7 is an RGB processor for mixing display characters generated by the on-screen display 6 and a television video signal, and 8 is a cathode ray tube for displaying video and screen display characters.

FIG. 4 is a screen for displaying the self-diagnosis result. If you continue to press a predetermined button on the remote control or control panel that you have decided in advance for a certain period of time,
Display this screen.

The operation of the self-diagnosis display device of the television receiver including the above components will be described below. First, the microcomputer 4 controls the main processing IC1 to IC3 by using the data and the clock for adjusting the image and the volume. An IIC bus line 5 is a typical example of this, and the microcomputer 4 on the master side transmits data while synchronizing the timing with a clock. Here, the 8th bit of the clock waveform on the IIC bus line 5 is called an ACK bit,
Main processing IC on the slave side with "H" or "L"
The microcomputer 4 on the master side can recognize whether the data 1 to IC3 have been normally received. That is, if the ACK bit is "H", it can be determined that the bus line communication and the operations of the main processing IC1 to IC3 are normal, and if the ACK bit is "L", it is abnormal.

If the microcomputer 4 performs such IIC communication regularly, it is possible to diagnose whether or not the operating states of the main processing IC1 to IC3 are normal. Here, IIC communication is mentioned as a method of self-diagnosis, but it is also possible to add each operation check using various sensors and the like.

The microcomputer 4 decodes the result by pressing a specific button on the remote control or the control panel on the front of the television receiver for a certain period of time and communicates it to the on-screen display 6 to generate a necessary screen display character. The screen display characters are input to the RGB processor 7 and mixed with the TV video signal, and then the display screen of the self-diagnosis result of FIG. Therefore, when the television receiver breaks down, the service person who repairs can make a limited judgment of the abnormal portion by looking at the self-screen, which has the advantage that it does not take time or labor for the repair.

[0008]

However, in the above-mentioned structure, the display area of the screen is limited, and it is impossible to display the image on a device having a large number of diagnostic displays, such as a liquid crystal projector which is a kind of a television receiver. In a dangerous state, the ballast power supply of the lamp, which is the light source, is shut down and turned off, and the self-diagnosis screen as described above cannot be displayed, so that there is a problem that the abnormal portion cannot be recognized.

In view of the above problems, the present invention provides a self-diagnosis display for easily displaying the details of the abnormality even when there are many diagnostic items or when the self-diagnosis result cannot be referred to on the screen by turning off the lamp. The purpose is to provide a device.

[0010]

In order to achieve the above object, a self-diagnosis display device of the present invention transmits data from a microcomputer for controlling a plurality of main processing ICs to a plurality of main processing ICs. A control bus line for displaying a plurality of laser light emitting diodes (LEDs) for displaying a self-diagnosis result, and each LED drive circuit,
A configuration is provided that includes a switching button and a reset button for hierarchically expressing each LED emission.

[0011]

The present invention has the above-mentioned configuration, even when an abnormality occurs in the device and the characters cannot be displayed on the screen,
If the LED and the switching button are used together, the abnormal place can be hierarchically limited and the user can be notified.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A self-diagnosis display device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a self-diagnosis display device according to an embodiment of the present invention in a liquid crystal projector.

In FIG. 1, reference numerals 9 to 11 represent the main processing IC1 to IC3 inside the liquid crystal projector. Reference numeral 12 is a microcomputer for controlling the main processing IC1 to IC3. Reference numeral 13 is a control bus line for transmitting from the microcomputer 12 to the main processing IC1 to IC3.
IC etc. are mentioned. Reference numeral 14 is a temperature sensor for monitoring high heat generated from the lamp, and 15 is a fan for cooling the high heat. Reference numeral 16 denotes a lamp that serves as a light source, and these constituent elements 14 to 16 are unique to the liquid crystal projector. Reference numeral 17 is a laser light emitting diode 1 (LED) for displaying a self-diagnosis result, and 18 and 19 are a resistor 1 and a transistor 1 for driving an LED, respectively. Similarly, 20-22 LED2 and drive part, 23-25 LED
3 and the driving part. Reference numerals 26 to 28 are switching buttons for hierarchically displaying and operating the abnormal portion, and 29 is a reset button for returning the display to the first layer.

FIG. 2 shows three LEDs determined at the time of manufacture.
It is an example of a list of meanings of the display, and is referred to when repairing. This structure is decided by the manufacturer considering the diagnosis contents.

The operation of the self-diagnosis display device including the above-mentioned components will be described below with reference to FIG. First, similarly to the conventional example shown in FIG. 2, the ACK bit is regularly monitored by using the IIC bus line or the like to check whether the main processing ICs 9 to 11 are operating normally. Further, the liquid crystal projector independently has the lamp 16 inside the device, but generates high heat in addition to light. In order to protect the weak heat member inside the device from this high heat, the temperature is monitored by the temperature sensor 14, and the cooling fan 15 is controlled according to the high or low temperature to protect the member inside the device from high temperature. That is, when the temperature is high, the fan rotation is increased, and when the temperature is low, the fan rotation is decreased. However, if it becomes extremely hot and the danger such as damage to parts is expected, or if the cooling fan fails and does not rotate,
Force the lamp power supply, which is the source of heat, to the off state (shutdown). Therefore, the microcomputer 12 constantly monitors the IIC communication status, the rotation status of the temperature sensor 14 and the cooling fan 15, and the power supply status of the lamp 16.

When shutting down, the lamp 16 is turned off so that no image is displayed, and it is difficult to find out what went wrong and shut down, and it is difficult to repair it because the failure location cannot be limited. Therefore, the microcomputer 12 turns on the transistor by turning the corresponding output port to "H" to turn on the LED corresponding to the abnormal item.

However, when the number of diagnostic items increases, the L
The number of EDs increases, resulting in a large volume and high cost. Therefore, in order to effectively use the LED, the voltage switching button 26
Through operations 28 to 28, the microcomputer 12 hierarchically narrows down the meaning of LED lighting each time the switching button is pressed.

As shown in FIG. 2, the first hierarchy is displayed in large block units, and the second hierarchy is illuminated and displayed with more detailed items among the items illuminated in the first hierarchy. In some cases, it is possible to add to the third layer and the fourth layer, and the cause is more limited in detail. At this time, L
The number of EDs is the maximum number of diagnostic items in each layer.

As an example of diagnosis, it is assumed that the liquid crystal projector is shut down and the screen disappears for some reason shown in FIG. When repairing, looking at the LED lighting state, the No. 1 LED is lit, and it can be seen that there is an abnormality related to IC communication. Further, the switch button 26 is pressed in order to know which IC is abnormal. Then, since the third LED is turned on, the main processing IC 3 is diagnosed as being in an abnormal state. If the reset button 27 is pressed to return the display from the second layer to the display of the first layer, the display can be repeatedly viewed.

[0020]

As is apparent from the above description of the embodiments,
According to the present invention, simply by adding a simple and inexpensive circuit,
It is possible to limit the abnormal parts at the time of repair to very detailed,
It can save time and manpower, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a self-diagnosis display device according to an embodiment of the present invention.

FIG. 2 is a list view of hierarchical LED display in the embodiment.

FIG. 3 is a schematic block diagram of a conventional self-diagnosis display device.

FIG. 4 is a self-diagnosis display screen diagram in a conventional example.

[Explanation of symbols]

 9 IC1 10 IC2 11 IC3 12 Microcomputer 13 IIC bus line 14 Temperature sensor 15 Cooling fan 16 Lamp 17 LED1 18 Resistor 1 19 Transistor 1 20 LED2 21 Transistor 2 22 Resistor 2 23 LED3 24 Transistor 3 25 Resistor 3 26 Switching button 1 27 Switch button 2 28 Switch button 3 29 Reset button

Claims (1)

[Claims] 1. A microcomputer for controlling a plurality of main processing ICs, and a control bus line for transmitting data from the microcomputer to the plurality of main processing ICs.
A self-diagnosis display device comprising a plurality of laser light-emitting diodes (LEDs) for displaying a self-diagnosis result, each LED drive circuit, and a switching button and a reset button for hierarchically expressing each LED light emission.