KR19990000399U - Lamp Hours Display on LCD Projector - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

LCD projector

2. The technical problem the invention is trying to solve

The present invention measures and accumulates the usage time of lamps used in LCD projectors and displays them externally for user identification.

3. Summary of solution of design

The present invention detects the oscillation unit 1 for generating a constant pulse signal in order to measure the lighting time of the lamp 100, and the center of accumulating the use time of the lamp 100 by detecting the pulse signal generated in the oscillation unit (1) The processor 2, the memory unit 3 for updating and storing the usage time of the lamp 100 accumulated in the central processing unit 2, and the use time accumulated and stored in the memory unit 3 A power supply unit 5 for supplying power so that the display unit 4 displayed on the outside and the lamp 100 whose usage time is displayed on the display unit 4 can be turned on according to a signal applied from the central processing unit 2. It consists of.

4. Important uses of the devise

This is to accumulate the lamp usage time of the LCD projector so that it can be displayed externally for user identification.

Description

Lamp Hours Display on LCD Projector

The present invention relates to an LCD projector that projects an image on an external screen by synthesizing an image separated into R (red), G (green), and B (blue), and particularly, displays the lamp usage time of the LCD projector to the outside. It relates to a lamp usage time display device of the LCD projector.

In general, an LCD projector (projector) can be combined with a television receiver or video to project an image on an external screen, and thus is mainly used for presentation of conference rooms, projectors of small theaters, and large-scale CRTs in homes.

This general LCD projector, as shown in Figure 1, the lamp 100 for irradiating light, and the red light dichroic for reflecting G and B and R transmitted among the white light emitted from the lamp 100 G and B transmitted through the mirror 110, the second mirror 120 reflecting downwardly the R transmitted from the red transmitting dichroic mirror 110, and the red reflecting dichroic mirror 110. Among them, the blue transparent dichroic mirror 130 that transmits B and the G reflects, the second mirror 140 that reflects B irradiated through the blue transparent dichroic mirror 130, and The third mirror 150 reflecting B reflected by the second mirror 140 upward again, the first mirror 120, the dichroic mirror 130 for blue transmission, and the third mirror 150. Each of R, G, and B incident by the light is synthesized by a dichroic prism 160 irradiated onto the projection lens 170. The first condenser lens 180 and the R LCD panel 190 are disposed between the dichroic prism 160 and the first mirror 120, and the dichroic prism 160 and the blue transparent dike are provided. A second condenser lens 181 and a G LCD panel 191 are provided between the lower mirror 130 and a third condenser lens 182 and a dichroic prism 160 between the third mirror 150. Each B LCD panel 192 is provided.

Referring to the light path of the conventional LCD projector configured as described above in detail as follows.

First, the R, G, and B components are included in the white light generated by the lamp 100 and irradiated and reflected to the remainder, where R is transmitted through the red-transmissive dichroic mirror 110 and then, firstly. Reflected downward from the mirror 120 and irradiated to the first condensing lens 180, G is reflected downward from the red-transmissive dichroic mirror 110, and then again the blue-transmissive dichroic mirror 130 Is reflected by the second condensing lens 181, B is reflected downward from the red-transmissive dichroic mirror 110 to pass through the blue-transmissive dichroic mirror 130, and subsequently The second and third mirrors 140 and 150 disposed to face each other are double reflected and irradiated to the third condensing lens 182.

As such, the R, G, and B radiated to the first, second, and third condensing lenses 180, 181, and 182 pass through the first, second, and third condensing lenses 180, 181, and 182. While the amount of light is increased, R is irradiated to the R LCD panel 190, G to the G LCD panel 191, and B to the B LCD panel 192. Accordingly, R, G, and B images are formed on the R, G, and B LCD panels 190, 191, and 192, respectively, and are synthesized into one image in the dichroic prism 160, which is a projection lens 170. ) Is imaged and projected onto the screen.

However, the use time of the lamp that generates light from the LCD projector and irradiates it in a predetermined direction is 2500 hours in the case of metal halide, and about 5000 hours in the case of xenon. Not only is it not achieved, there is a problem that can not form an image due to insufficient brightness.

Accordingly, the present invention has been made in view of the above-mentioned general defects, and an object thereof is to provide a lamp use time display device of an LCD projector which accumulates the use time of the lamp and displays the outside.

The lamp usage time display device of the LCD projector includes an oscillator for generating a constant pulse signal to measure the lighting time of the lamp, a central processing unit for detecting the pulse signal generated by the oscillator and accumulating the lamp usage time, and the center. The central processing unit includes a memory unit for updating and storing the accumulated lamp usage time in the processing unit, a display unit for externally displaying the usage time accumulated and stored in the memory unit, and a lamp for displaying the usage time in the display unit. It is characterized by consisting of a power supply for supplying power to be turned on according to the signal.

1 is a block diagram showing an optical path of a typical LCD projector.

Figure 2 is a circuit block diagram showing the operation of the present invention.

Explanation of symbols on the main parts of the drawings

1: oscillator 2: central processor

3: memory section 4: display section

5: power supply unit 100: lamp

Hereinafter, the structure of the present invention will be described in detail with reference to the accompanying drawings. 1 is a schematic block diagram showing an optical path of a general LCD projector, Figure 2 is a circuit block diagram showing the operation of the present invention.

The LCD projector to which the present invention is applied includes a red-transmissive dichroic mirror 110 that reflects G and B and transmits R of white light emitted from the lamp 100, and the red-transmissive dichroic mirror 110. The blue mirror dichroic mirror for transmitting B and transmitting G among the first and second mirrors 120 reflecting R transmitted downward from the red mirror reflecting dichroic mirror 110 and B is reflected. 130, the second mirror 140 reflecting the B irradiated through the blue dichroic mirror 130, and the B reflected by the second mirror 140 again upward. The third mirror 150, the first mirror 120, the blue-transmissive dichroic mirror 130, and each of the R, G, and B rays incident by the third mirror 150 are combined with the projection lens. It consists of a dichroic prism 160 irradiated by 170, the dichroic prism 160 and the first mirror 120 The first condenser lens 180 and the R LCD panel 190 are provided therebetween, and the second condenser lens 181 and the G LCD are disposed between the dichroic prism 160 and the blue transparent dichroic mirror 130. The panel 191 is provided, and the third condenser lens 182 and the B LCD panel 192 are provided between the dichroic prism 160 and the third mirror 150, respectively.

In this LCD projector, the present invention detects a pulse signal generated by the oscillation unit 1 and the oscillation unit 1 to generate a constant pulse signal in order to measure the lighting time of the lamp 100 of the lamp 100. A central processing unit 2 accumulating the usage time, a memory unit 3 for updating and storing the usage time of the lamp 100 accumulated in the central processing unit 2, and the memory unit 3; The display unit 4 displays the accumulated and stored usage time on the outside and supplies the power to light the lamp 100 displaying the usage time on the display unit according to a signal applied from the central processing unit 2. The memory unit 3 is composed of an E.P. ROM (EPROM) free to record and remove the processed information.

Next will be described in detail the operation process of the present invention configured as described above.

First, when the user supplies power to use the LCD projector, the lamp 100 is emitted by the power of the power supply unit 5 supplied with a power supply signal from the central processing unit 2 to the power supply unit 5. At the same time, the central processing unit 2 detects a pulse signal of a constant cycle generated by the oscillator 1 and measures the running time of the lamp 100 to accumulate. At this time, the lamp accumulated in the memory unit 3 freely records and corrects data so as to prevent the loss of use time data accumulated in the central processing unit 2 caused by the power supply interruption due to an accident such as a power failure. Store the usage time of (100).

On the other hand, the usage time of the lamp 100 accumulated in the central processing unit 2 and stored in the memory unit 3 is displayed externally so that the user can be identified by the signal from the central processing unit 2. Since it is possible to visually recognize the accumulated use time until then it is possible to predict the replacement time of the lamp 100.

As described above, the present invention measures and accumulates the use time of the lamps used in the LCD projector so that they can be displayed on the outside, thereby not only predicting the replacement time of the lamps in advance, but also improving the reliability of the device. Have the effect of being able to.

Claims (2)

In the LCD projector, An oscillator 1 for generating a constant pulse signal to measure a lighting time of the lamp 100; A central processing unit (2) which counts the pulse signal generated by the oscillator (1) when the lamp (100) is turned on to accumulate the usage time of the lamp (100); A memory unit 3 for updating and storing the usage time of the lamp 100 accumulated in the central processing unit 2; A display unit 4 for visually displaying the usage time of the lamp 100 accumulated and stored in the memory unit 3; Lamp using time of the LCD projector, characterized in that the power supply unit for supplying the lighting power of the lamp 100 in accordance with the signal applied from the central processing unit (2). The memory unit 3 according to claim 1, Lamp usage time display device of the LCD projector characterized by consisting of EPROM free to record and remove the processed information.