JP2001100691A - Video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video display device that when lamp abnormality occurs, it is not necessary to connect to another equipment, a lamp using time is displayed only with the device main body, handleability is good, the cost is reduced because an exclusive display part is not needed and an appearance design is not affected. SOLUTION: When the lamp abnormality occurs in S12 (Y), a source circuit 9 is controlled, and a power supply to the lamp 4 is stopped (S14), and the lamp using time is written in a memory (S15), and the lamp using time display is performed using a light emitting element group 11 for displaying the operation state of the video display device of figure 1 (S17).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video display device, and more particularly to a video display device using a lamp such as a projection television.

[0002]

2. Description of the Related Art In a video display device using a lamp, such as a projection television, an image is projected on a video display element such as a liquid crystal display panel, and the light of the lamp is projected from the back or the like so that the video is displayed on a screen. Enlarged display. In this type of lamp, gas is sealed between the electrodes,
When the power is turned on, light emission is started by applying an AC high voltage between the electrodes to ionize the gas, and it takes some time to achieve a stable light emission state. When the power is turned off, the power supply to the lamp is stopped, and after a while the gas between the electrodes is uniformly distributed, the lamp can be turned on again.

[0003]

However, there is a case where a lamp abnormality such as a sudden turning off of a lamp occurs while a user is watching. In this case, the user calls for service and requests repair or lamp replacement. The service person also needs to know the cumulative usage time of the lamp (hereinafter simply referred to as usage time) in order to determine whether the lamp has gone out of service after its lifetime or some other cause. As a method of knowing the lamp usage time, there is a method in which the lamp usage time is always stored in a memory, and when a lamp abnormality occurs, an external device such as a computer is externally connected to read out the usage time from the memory. It is necessary to connect a device, and there is a problem that the usage time of the lamp cannot be displayed only with the video display device main body, and the usability is poor.

In order to solve this problem, a dedicated lamp use time display section may be provided in the image display device main body, and the lamp use time may be displayed by, for example, a 7-segment LED. It is unnecessary to provide a dedicated display unit only for a service person, which is wasteful, increases the cost, and is not preferable in terms of the external design of the video display device. The present invention has been made in order to solve the above-described problems, and when a lamp abnormality occurs, there is no need to connect to another device, and the usage time of the lamp can be displayed only with the image display device main body. It is an object of the present invention to provide a video display device that is easy to use and does not require a dedicated display unit, so that the cost is low and the external appearance design is not affected.

[0005]

In order to achieve the above object, a video signal processing circuit for processing an input video signal, a video display element for inputting an output signal of the video signal processing circuit and displaying a video are provided. A lamp for projecting light to the image display element, an optical system for enlarging an image displayed on the image display element to obtain projection light for display on a screen, and a power supply circuit for supplying power to the lamp and the like In a video display device comprising: a light emitting element group disposed on a front portion of the video display device, for displaying an operation state of the video display device,
A memory for storing the cumulative use time of the lamp, and, when a lamp abnormality occurs, controlling the power supply circuit to stop power supply to the lamp and to store the cumulative use of the lamp stored in the memory. And a control unit for controlling the light emitting element group so as to display time.

[0006]

FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, an input video signal is input from an input terminal 1 and supplied to a video signal processing circuit 2.
The video signal processing circuit 2 performs various processes on an input video signal, and supplies an output signal to the video display element 3. The image display element 3 is a liquid crystal plate or the like, and displays an image according to the supplied image signal. In many cases, the lamp 4 is formed of a lamp such as a metal halide lamp or an ultra-high pressure mercury lamp, and the light is projected from the back or the front of the image display element 3 to obtain transmitted light or reflected light, thereby obtaining a known light. As described above, the projection light for the enlarged display is obtained by the optical system 5 including a lens and the like, and the enlarged image is displayed on the screen 6.

The control unit 7 is often constituted by a microcomputer or the like, and performs various controls in the video display device.
An operation command from the user is input from the key input unit 8,
The control unit 7 performs various controls based on the command contents. For example, in the case of a power-on command, the power supply circuit 9 is controlled to supply power to the lamp 4 and other circuits, and the cooling fan 1
0 is rotated to cool a high temperature portion such as the periphery of the lamp 4. Further, the control unit 7 controls the light emitting element group 11 disposed on the front part of the video display device to notify a user of an operation state of the video display device. The light emitting element group 11 usually uses an LED (light emitting diode) in many cases, but may be a lamp, a liquid crystal display panel, or an EL display panel. In addition, lamp 4
Are unitized with the memory 12, and the lamp 4 and the memory 12 are simultaneously replaced. Control unit 7
Writes the latest data of the accumulated lamp usage time into the memory 12 when the power is turned off.

FIG. 3 is a diagram showing an example of the appearance of the video display device. In FIG. 3, which is a so-called rear projection type image display device, a light emitting element group 11 composed of 10 LEDs is arranged at a lower central portion of the screen 6. In addition, a power key 13 and a power-on display LED 14 are provided. In addition, although there are operation keys and a remote control light receiving unit, they are omitted.

FIG. 4 is a diagram for explaining a display state of the light emitting element group. The light emitting element group 11 in FIG. 1 is usually for notifying the user of the operation of the video display device. When the user operates the power key 13 of the main body or the power key of the remote control transmitter to send a power-on command, the power-on display LED 14 is turned on immediately, but as described above, until the discharge of the lamp is stabilized. Requires a considerable amount of time, so that despite the user turning on the power, images and the like do not appear immediately, which may confuse the user.

FIG. 4A shows a display state of the light emitting element group 11 when the power is turned on. First, as soon as the power-on command is issued, all ten LEDs are turned on, and after five seconds, nine LEDs are turned on.
After 10 seconds, 8 lamps are turned off and 1 lamp is turned off every 5 seconds, 30 lamps are turned on after 30 seconds, and all lamps are turned off after 50 seconds. Looking at the display state of the light emitting element group 11, the user can perceive that the power-on operation is in progress, and there is no confusion.

When the power is turned off, if there is a power-off command, the lamp 4 is turned off immediately by the control of the power supply circuit 9. However, the temperature of the peripheral portion of the lamp 4 and the like is considerably high. The cooling fan 10 must continue to be turned on for about one minute thereafter. FIG. 4B shows the light emitting element group 11 when the power is turned off.
Shows the display state of. When receiving a power off command,
Only two consecutive LEDs out of the ten LEDs are sequentially turned on, and the display turns (1) to (10) in FIG. The user can see from the display state of the light emitting element group 11 that the cooling fan is rotating.

Next, the control operation of the control section 7 will be described. FIG. 2 is a flowchart for explaining the operation of the present invention. In FIG. 2, when the program starts, it is determined whether or not there is a key input by the user from the key input unit 8 (S1: step 1). If there is no key input (N = No), the process proceeds to S12. If there is a key input
(Y = Yes), determine if it is a power key
(S2). In this case, the power key performs a toggle operation that repeats on and off each time the power key is pressed.

In S2, if it is not the power key (N), it is determined whether or not it is the lamp usage time display key (S3). If it is a lamp usage time display key (Y), the lamp usage time is read from the memory 12 (S4), the video signal processing circuit 2 is controlled, and the lamp usage time is superimposed on the video signal to perform on-screen display. It is displayed on the screen 6 (S5), and returns to the start. If it is not the lamp use time display key in S3 (N), the on-screen display of the lamp use time is deleted (S6), and the process returns to the start. Here, the lamp usage time display key is for confirming the usage time of the lamp when the lamp is normal, not when the lamp is abnormal. When the lamp is abnormal, the lamp does not emit light and an image is not displayed, and thus is useless.
The lamp usage time display key may be provided with a dedicated key. Of course, the lamp usage time may be displayed by simultaneously pressing two keys for other purposes of the remote control transmitter. It is.

Next, in S2, if it is a power key (Y), it is determined whether or not the power is currently off (S7). If the power is not off (N), the power is on, so the power is off. Therefore, the power off process is executed (S8), the latest data of the lamp usage time is written into the memory 12 (S9), and the process goes to start. Return. In the power-off process, the power supply circuit 9 is controlled to stop the power supply to the lamp 4 and other circuits. After about one minute has elapsed and the temperature around the lamp 4 has dropped, the cooling fan 10 is stopped. Alternatively, the display of the light emitting element group 11 when the power is turned off described with reference to FIG. If the power is currently off in S7 (Y), the power-on command is issued, so the power-on process is performed (S10), and the lamp usage time is read from the memory (S11). The power-on process includes controlling the power supply circuit 9 to supply power to the lamp 4 and other circuits, rotating the cooling fan 10 to cool a high-temperature portion such as the periphery of the lamp 4, and so on. The display of the light emitting element group 11 when the power is turned on described in FIG.

Next, it is determined whether or not a lamp abnormality has occurred due to a change in lamp current or a change in brightness around the lamp (S12). If no lamp abnormality has occurred (N), the lamp usage time read out in S11 is continuously counted (S13), and the process returns to the start. If a lamp abnormality has occurred (Y), the power supply circuit 9 is controlled to stop supplying power to the lamp 4 (S14), and the latest data of the accumulated lamp usage time is written to the memory (S15), and the lamp abnormality is detected. Display is performed (S16). The lamp abnormality display is, for example, as shown in FIG.
The power-on display LED 14 and the like may be flashed. Then, the lamp usage time is displayed by the light emitting element group 11.
(S17), returning to the start.

FIG. 4C shows a display state of the light emitting element group 11 when displaying the lamp usage time. For example, if the lamp usage time is 1999 hours and 30 minutes, FIG.
As shown in (1) to (12), numbers of each digit, 1, 9, 9,
Lights 9,3,0 sequentially for 1 second, the middle of each number is 1
It is displayed with all lights off for seconds. By looking at this display, the service person can know that the lamp usage time was 1999 hours and 30 minutes. In FIG. 4 (C), when the number is 1, one LED is turned on, and when the number is 9, the LED is turned on.
I turned on 9 LEDs and turned on all 10 LEDs when the number was 0.
Of course, the numbers may be displayed by another method.
Also, an example in which the light emitting element group 11 is configured by 10 LEDs has been described. However, 9 or 8 LEDs may be used. Needless to say, it is only necessary to define a number and notify the service person in advance.

[0017]

According to the video display device of the present invention, when a lamp abnormality occurs, there is no need to connect to another device, and the usage time of the lamp can be displayed only by the video display device main body, so that it is easy to use. Moreover, since a dedicated display unit is not required, there is an extremely excellent effect that the cost is low and the appearance design is not affected.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the present invention.

FIG. 3 is a diagram illustrating an example of an appearance of a video display device.

FIG. 4 is a diagram illustrating a display state of a light emitting element group.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input terminal 2 Video signal processing circuit 3 Video display element 4 Lamp 5 Optical system 6 Screen 7 Control part 8 Key input part 9 Power supply circuit 10 Cooling fan 11 Light emitting element group 12 Memory 13 Power key 14 Power-on display LED

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[Procedure amendment]

[Submission date] November 10, 1999 (1999.11.
10)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

Next, it is determined whether or not a lamp abnormality has occurred due to, for example, a rise in lamp power supply voltage or a change in brightness around the lamp (S12). If no lamp abnormality has occurred (N), the lamp usage time read out in S11 is continuously counted (S13), and the process returns to the start. If a lamp abnormality has occurred (Y), the power supply circuit 9 is controlled to
The power supply to the CPU is stopped (S14), the latest data of the accumulated lamp usage time is written in the memory (S15), and a lamp abnormality is displayed (S16). The lamp abnormality display is, for example,
The power-on display LED 14 and the like in FIG. Then, the lamp usage time is displayed by the light emitting element group 11 (S17), and the process returns to the start.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) // H05B 41/16 H05B 41/16 X F term (reference) 3K082 AA15 AA68 BD15 BD26 BE10 DA01 5C006 AF13 AF65 AF67 AF78 BB11 BF29 EA01 EC11 FA52 5C058 AA06 BA35 EA12 EA52 5C080 AA07 AA10 BB05 BB09 CC06 DD13 DD14 DD16 DD22 DD27 JJ01 JJ02 JJ06 JJ07 5G435 AA00 BB04 BB17 DD01 EE30 GG28 LL15

Claims (2)

[Claims] A video signal processing circuit for processing an input video signal, a video display element for receiving an output signal of the video signal processing circuit and displaying a video, and a lamp for projecting light to the video display element; An image display device comprising: an optical system that obtains projection light for enlarging an image displayed on the image display element and displaying the image on a screen; and a power supply circuit that supplies power to the lamp and the like. A light-emitting element group disposed on the front surface for displaying an operation state of the image display device; a memory for storing a cumulative use time of the lamp; and controlling a power supply circuit when a lamp abnormality occurs. A control unit for stopping power supply to the lamp and controlling the light emitting element group to display the accumulated use time of the lamp stored in the memory. Display devices. 2. The display of the cumulative use time of the lamp is characterized in that each digit of the cumulative use time is sequentially and intermittently displayed using the lighting state of the light emitting element group. The video display device according to claim 1.