KR20000014425U - Lamp overheating prevention device of TMC projection system - Google Patents

Abstract

The present invention attaches a temperature sensor to the surface of a lamp in a TMA (Thinfilm Micromirror Array-actuated) projection image display device, and automatically cuts off the power of the TMA projector when the temperature of the lamp reaches a preset temperature. The present invention relates to a lamp overheating prevention device of a TMA projection system capable of preventing a failure, and for this purpose, the present invention is mounted on one surface of a lamp, and means for measuring a temperature of heat generated from the lamp and a measured temperature of the lamp. Means to generate a first level signal when the temperature is greater than or equal to a preset temperature, and means for generating a second level signal when the temperature of the measured lamp is less than the preset temperature, and to power on the TMA projection system based on the first level signal. Means for blocking.

Description

Lamp overheating prevention device of TMC projection system

The present invention relates to a projection display using a TMA (Thinfilm Micromirror Array-actuated), and more particularly, to automatically overheat the lamp by measuring the temperature of the lamp supplying the light source of the TMA projector. And a lamp overheating prevention device of a TMA projection system suitable for preventing the damage.

In general, a device for projecting optical energy onto a screen includes a direct-view image display device and a projection-type image display device according to a method of displaying optical energy on a screen. type image display device).

An example of a direct-view image display device is a CRT (Cathode Ray Tube). The CRT device is called a CRT, which has excellent image quality but increases in weight and volume as the screen is enlarged, leading to an increase in manufacturing cost. There is.

The optical path adjusting device, which is a projection image display device, includes a liquid crystal display (hereinafter referred to as LCD), a deformable mirror device (hereinafter referred to as DMD), and a thin film micromirror array-actuated (Thinfilm). Micromirror Array-actuated: hereinafter referred to as TMA).

Since the LCD has a very simple optical structure, it can be thinly formed to reduce the weight and the volume. However, since light passes through the polarizer, the light efficiency is low, and there is a problem inherent in the liquid crystal material, for example, a slow response speed and a tendency to overheat the inside thereof. In addition, the maximum light efficiency of existing transmission light modulators is limited to a range of 1 to 2% and requires dark room conditions to provide acceptable display quality.

Optical modulators such as DMD and TMA have been developed to solve the problems of the aforementioned LCD type optical modulators. Thus, the DMD shows a relatively good light efficiency of about 5%, but serious fatigue problems are caused by the hinge structure employed in the DMD. In addition, there is a disadvantage that a very complicated and expensive driving circuit is required.

In contrast, TMAs are piezoelectrically driven mirror arrays that provide greater than 10% light efficiency. In TMA light modulators, each actuator generates a deformation in accordance with the electric field generated by the applied electrical image signal and the bias voltage. When the actuator causes deformation, the respective mirrors mounted on the actuator are inclined to reflect the light incident from the light source at a predetermined angle.

Such a TMA optical modulator has a simple structure and operation principle, and can obtain high light efficiency compared to LCD or DMD. It also provides enough contrast to provide a bright and clear image under normal room temperature light conditions. Moreover, light does not pass through the polarizer. In addition, the reflective properties of the TMA are relatively less sensitive to temperature, which has the advantage that the brightness of the screen can be improved over other devices that are easily affected by high power light sources.

On the other hand, such a general TMA projector is provided with a lamp to obtain a light source required to project the R, G, B production signal, and outputs the R, G, B color signals using the light source generated from the lamp. When such a lamp is overheated, a malfunction of the TMA projector may be caused, thereby causing a failure such as an overall inoperable state of the TMA projection system.

Therefore, the present invention has been devised in view of the above, and in the TMA projection type image display device, by attaching a temperature sensor to the surface of the lamp, when the temperature of the lamp reaches a predetermined temperature or more, the TMA projector is automatically turned off It is therefore an object of the present invention to provide a lamp overheating prevention device of the TMA projection system that can prevent the TMA projection system failure.

In order to achieve the above object, the present invention is a lamp overheating prevention device of a TMA projection system for projecting an image signal input from the outside by using a light source generated from the lamp to display on the screen, and is mounted on one surface of the lamp Means for measuring a temperature of heat generated from the lamp; Means for generating a first level signal when the temperature of the measured lamp is above a preset temperature and generating a second level signal when the temperature of the measured lamp is below a preset temperature; The lamp overheat prevention device of the TAM projection system including a means for shutting off the power of the TMA projection system based on the first level signal.

1 is a block diagram of a lamp overheat prevention apparatus of a TMA projection system according to a preferred embodiment of the present invention,

Figure 2 is a circuit diagram showing an embodiment of the configuration of the lamp overheat protection device of the TMA projection system according to a preferred embodiment of the present invention.

〈Explanation of the Signs of Major Parts of Drawings〉

10 lamp driving unit 20 lamp

30: temperature sensor 40: comparison unit

50: micom

Hereinafter, a preferred embodiment of the lamp overheat prevention apparatus of the TMA projector using the sensor according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a lamp overheat prevention apparatus of a TMA projection system using a sensor according to a preferred embodiment of the present invention, a lamp driving unit 10, lamp 20, temperature sensor 30, comparison unit 40 ), And the microcomputer 50.

Referring to the same figure, the lamp driver 10 means a means for supplying power for driving the lamp 20 for supplying a light source of the TMA projector, the lamp 20 is applied to the power applied from the driver 10 By driving by generating a light source for outputting the R, G, B image signal of the TMA projector to output to the color filter (not shown).

The temperature sensor 30 is a means for sensing heat generated from the lamp by attaching to one surface (for example, a side portion or a rear end) of the lamp 20, and corresponding resistance based on the detected change in temperature. It will output the value variably. On the other hand, since most lamps 20 used in general TMA projectors are operated at 150 ° C or less, the above-described temperature sensor 30 has the most resistance tolerance near 150 ° C for more accurate temperature measurement. It uses a small NTC (Negative Temperature Coefficient) type temperature sensor.

The comparator 40 compares the temperature sensed by the temperature sensor 30 with a predetermined temperature (eg, 150 ° C.), and then compares the low level signal and the high level corresponding to the comparison result. The signal is selectively output. For example, when the temperature of the lamp 20 detected from the temperature sensor 30 is 150 ° C. or higher, a high level signal is generated, and when the temperature of the lamp 20 is lower than 150 ° C., a low level signal is generated. do.

In addition, the microcomputer 50 controls the overall operating state of the TMA projector, and in particular, the TMA projector is turned on / off based on the high level or low level signal generated from the comparator 40. That is, when the temperature of the lamp 20 is 150 ° C. or higher and a high level signal is generated from the comparator 40, the power of the TMA projector including the lamp driver 10 is turned off.

Figure 2 is a circuit diagram showing an embodiment of the configuration of the lamp overheat prevention device of the TMA projection system according to a preferred embodiment of the present invention, with reference to the same figure, lamp overheating of a TMA projector according to a preferred embodiment of the present invention The prevention device will be described in detail as follows.

The resistance (R _T) value of the temperature sensor 30 when the temperature is 150 ℃ of heat generated from the lamp 20 in the lamp overheating preventing device is configured as shown in Figure 2 is approximately 3㏀. As a result, the resistance R _T of the temperature sensor of the lamp 20, a temperature sensor 30 when the temperature is less than 150 ℃ of detection from 30 is more than 3㏀.

Therefore, the voltage of the line L41 becomes 1V or more, so that 1V ( Higher than), the signal output through the comparator 40 becomes a low level signal. At this time, the microcomputer 50 determines that the lamp 20 is operating within a normal range based on the low level signal output through the comparator 40.

On the contrary, if the temperature of the lamp 20 is 150 ° C. or higher, the resistance value R _T of the temperature sensor 30 becomes less than 3 kV, so that the voltage flowing through the line L41 becomes 1 V or less and the line It becomes lower than 1V of (L43). Therefore, the comparator 40 outputs a high level signal, and the microcomputer 50 operates the lamp 20 abnormally based on the high level signal output through the comparator 40, that is, the lamp 20. ) Is overheated.

Therefore, the microcomputer 50 turns off the power of the TMA projector to block the operation of each component including the lamp driving unit 10, thereby preventing a failure caused by overheating of the TMA projector.

As described above, according to the present invention, the TMA projection image display device detects when the temperature of the lamp is higher than the preset temperature and automatically shuts off the power of the TMA projector, thereby preventing the TMA projection system from malfunctioning due to lamp overheating. It can be effective.

Claims (1)

In the lamp overheat prevention device of a TMA (Thinfilm Micromirror Array-actuated) projection system for projecting an image signal input from the outside using a light source generated from the lamp to display on the screen, Means mounted to one surface of the lamp, for measuring a temperature of heat generated from the lamp; Means for generating a first level signal when the temperature of the measured lamp is above a preset temperature and generating a second level signal when the temperature of the measured lamp is below a preset temperature; And overheating the TMA projection system based on the first level signal.