KR20100097445A - Apparatus for controlling brighting lamp of prpjector - Google Patents

Abstract

The present invention relates to a projector lamp brightness control device.

The present invention detects the beam amount according to the illumination of the installation environment and the distance to the screen in the projector irradiating the beam amount fixed to the screen irrespective of the surrounding environment, and the driving current of the lamp as the current beam amount is larger and smaller than the detected beam amount By controlling the brightness of the lamp to be irradiated by controlling the size small and large, it is possible to reduce the unnecessary driving current of the lamp, and to provide an effect of extending the life of the lamp out.

Description

Projector lamp brightness controller {APPARATUS FOR CONTROLLING BRIGHTING LAMP OF PRPJECTOR}

The present invention relates to a projector lamp brightness adjusting device, and more particularly, to a projector lamp brightness adjusting device to adjust the brightness of the projector lamp according to the ambient illumination of the projector and the irradiation distance with the screen.

In general, a projector is a device that receives signals from various video devices such as a TV, a VCR, a DVD player, a PC, a camcorder, and displays an enlarged image on a screen through a lens. The ability to automatically display optimal screens simply by plugging them in is now widely used for corporate presentations and home theaters.

In order to secure a projection distance, projectors that are widely used now implement a magnified image on a screen by irradiating a beam while being installed at a position far from the screen, and the beam irradiated from the projector is to be constantly irradiated. For example, when the irradiation distance between the projector and the screen is far or near, the image is blurred on the screen or irradiated beyond the size of the screen, making it difficult to display a clear screen.

Therefore, the user adjusts the lens to match the irradiation distance between the projector and the screen, and adjusts the screen size, focuses, and the like.

In recent years, with the development of technology, projectors have been miniaturized to be easy to carry and use, so that they can be used easily regardless of place while carrying around, but all projectors use a light source device regardless of size. In order to implement, it is necessary to secure the irradiation distance, to install at a predetermined distance from the screen, and to secure appropriate illuminance.

When the presentation is made, however, the projector is placed in various environments. At this time, the projector irradiates a fixed beam amount irrespective of the surrounding environment. For example, the illumination of the surrounding environment is larger than the beam amount irradiated from the lamp of the projector. In the case of light, the screen is relatively dark due to the contrast difference, so that the image is not easily blurred. On the other hand, when the surrounding environment is dark, the illuminance is less than the fixed beam amount of the lamp of the projector, and thus the beam amount of the lamp is excessively irradiated. It is a case.

In addition, when the projector is installed at a close irradiation distance to the screen when the light is relatively bright with respect to the beam amount irradiated at a predetermined irradiation distance by the fixed beam amount irradiated from the lamp of the projector when irradiating excessive light Will occur.

In this case, there is no problem in the case of medium and large projectors, but in the case of a portable small projector using a battery, the battery consumption is unnecessarily increased, thereby shortening the use time and further reducing the lamp life. .

An object of the present invention is to adjust the brightness of the lamp to be irradiated according to the environment in which the projector is installed.

In order to achieve the above object, the present invention provides an optical engine for optically expanding and irradiating an input signal, a lamp driver for supplying a driving current to the optical engine, and a signal input to the light engine and the lamp driver. In the projector composed of a control unit for controlling,

The control unit detects the beam amount according to the illuminance and distance detected by the illuminance sensing unit for detecting the illuminance of the surrounding environment and the distance with the screen, and compares the detected beam amount with the currently irradiated beam amount It is characterized by adjusting the brightness.

The control unit lowers the beam amount when the beam amount irradiated is larger than the beam amount according to the illumination intensity of the surrounding environment or the distance to the screen. do.

The illuminance detection unit is composed of an illuminance sensor.

The distance detecting unit is configured of either an ultrasonic wave or an infrared sensor.

The distance sensing unit is provided with a lens focusing wheel for adjusting the focus of the beam irradiated to the screen and a wheel sensing unit for sensing the distance with a variable resistance value associated with the focusing displacement of the lens focusing wheel.

Therefore, according to the present invention, the projector irradiates the beam amount fixed to the screen irrespective of the surrounding environment and detects the beam amount according to the illuminance of the installation environment and the distance to the screen, and according to the present beam amount is larger and smaller than the detected beam amount By controlling the brightness of the lamp to be irradiated by controlling the drive current to a small large, it is possible to reduce the unnecessary drive current of the lamp, and to provide the effect of extending the life of the lamp out.

1 is an overall block diagram of the projector lamp brightness adjustment device of the present invention, FIG. 2 is another embodiment of the projector lamp brightness adjustment device of the present invention, and FIG. 3 is a flowchart of the projector lamp brightness adjustment device of the present invention.

The present invention consists of a power supply unit 11, a lamp driving unit 12, an optical engine unit 13, an illumination intensity sensing unit 14, a distance sensing unit 15, and a control unit 16.

The power supply unit 11 is composed of a rectifier or a battery for rectifying the AC power input to a predetermined constant voltage.

The lamp driver 12 supplies a driving current of the lamp with a constant voltage input from the power supply unit 11, and the lamp driver 12 is provided with a variable variable to change the driving current.

The optical engine unit 13 optically enlarges the image signal and irradiates the enlarged beam, and the optical engine unit 13 includes an optical unit, an image pickup device, and a lamp.

The illuminance detection unit 14 detects the brightness of the surrounding environment of the place where it is installed, and is provided to detect the amount of light with the Cds element.

The distance detecting unit 15 detects the distance to the screen and is provided to detect the distance using infrared rays or ultrasonic waves.

As shown in FIG. 2, the distance detecting unit 15 focuses the lens focusing wheel 131 and the lens focusing wheel 131 of the light engine 13 to adjust the focus of the beam irradiated onto the screen. The wheel is provided with a wheel sensing unit 132 that senses a distance as an adjustable displacement, that is, a variable resistance value associated with a long and short focal adjustment displacement.

The controller 16 controls and processes the input image signal as a digital signal, and adjusts the distance between the illuminance and the screen detected by the illuminance detector 14 and the distance detector 15 according to the preset illuminance and distance. In comparison with the reference value, the lamp driver 12 is controlled according to the compared value to adjust the beam amount emitted from the lamp of the light engine unit 13.

The controller 16 includes a memory in which table values for dividing brightness into eight levels are set according to the illuminance detected by the illuminance detector 14 and the distance detector 15 and the distance to the screen.

According to the present invention constituted as described above, when power is applied from the power supply unit 11 to the lamp driving unit 12, the lamp driving unit 12 supplies the lamp driving current to the light engine unit 13 to drive the lamp. When the beam is irradiated to the front screen to maintain the standby state, and then the image signal input from the control unit 16 is input to the optical engine unit 13, the optical engine unit 13 receives the input image signal from the optical unit Through this, the enlarged beam quantity is irradiated to the screen.

At this time, the beam amount irradiated on the screen is fixed, so the image irradiated on the screen appears blurry or very bright depending on the illuminance of the place where the project is installed and the distance to the screen.

Therefore, as shown in FIG. 3, the controller 16 varies the resistance in conjunction with the focus adjustment of the illuminance detecting unit 14 and the distance detecting unit 15 or the illuminance detecting unit 14 and the lens focusing wheel 131. The illuminance of the room and the distance between the screen are detected through the wheel detecting unit 132 for detecting the distance by the value (step 21), and the control unit 16 detects the illuminance detecting unit 14 and the distance detecting unit 15 or The brightness of the lamp is detected through the memory in which the brightness of the lamp is stored in eight levels with respect to the illuminance and the distance detected by the wheel sensing unit 132. In this case, the detected brightness detects the beam amount according to the brightness set in the memory.

Therefore, it is determined whether the amount of beams detected in the memory according to the detected illuminance and the distance to the screen matches the amount of beams currently irradiated (step 22). If the detected beam amount is consistent with the amount of beams currently irradiated, The controller 16 determines that the amount of beam irradiated from the light engine unit 13 is appropriate to the current illuminance and the distance to the screen, and maintains the driving current of the lamp driver 12 in the current state so as to maintain the current state. The beam is irradiated through (step 23).

However, if the detected beam amount does not match the beam amount currently irradiated, it is determined whether the beam amount currently irradiated is greater than the detected beam amount, that is, whether it is bright (step 24). In this case, the beam amount currently irradiated than the detected beam amount is determined. If large, that is, bright, the controller 16 determines that the beam amount is large because the current illuminance is low, the distance to the screen is close, or the current illuminance is low, or the distance to the screen is close. The driving current of the lamp driving unit 12 is controlled to a beam amount smaller than the present, that is, the detected beam amount to irradiate the beam through the light engine unit 13 (step 25).

On the other hand, if the beam amount currently irradiated is not larger than the detected beam amount, i.e., it is not bright, the controller 16 has a high illuminance, a distance from the screen, a high illumination of the environment, or a distance from the screen. When it is determined that the beam amount is far away, the controller 16 controls the ramp driver 12 to a beam amount larger than the present time, that is, the detected beam amount to irradiate the beam through the light engine unit 13 (step 26). ).

1 is an overall block diagram of the projector lamp brightness adjustment device of the present invention

Figure 2 is another embodiment of the projector lamp brightness adjustment device of the present invention

Figure 3 is a flow chart of the projector lamp brightness adjustment device of the present invention

* Description of the symbols for the main parts of the drawings *

11; A power supply unit 12; Lamp drive part

13; Light engine unit 131; Lens focus wheel

132; A wheel detecting unit 14; Illumination detection department

15; Distance sensing unit 16; Control

Claims (5)

A projector comprising an optical engine unit for optically expanding and irradiating an input signal, a lamp driving power supply unit supplying a driving current to the optical engine unit, and a control unit controlling the light engine unit and the lamp driving power supply unit by signals inputted thereto. In The control unit detects the beam amount according to the illuminance and distance detected by the illuminance sensing unit for detecting the illuminance of the surrounding environment and the distance with the screen, and compares the detected beam amount with the currently irradiated beam amount Projector lamp brightness control comprising adjusting brightness. The method of claim 1, The control unit lowers the beam amount when the beam amount irradiated is larger than the beam amount according to the illuminance of the surrounding environment or the distance to the screen, and increases the beam amount when the beam amount currently irradiated is smaller than the beam amount according to the illuminance or the distance to the screen. Projector lamp brightness adjuster. The method of claim 1, The illuminance detecting unit is a projector lamp brightness adjusting device configured by the illuminance sensor. The method of claim 1, The distance sensor is a projector lamp brightness adjusting device configured by any one of the ultrasonic or infrared sensor. The method of claim 1, The distance detecting unit includes a lens focusing wheel for adjusting the focus of a beam irradiated to a screen and a wheel detecting unit for detecting a distance with a variable resistance value associated with a focusing displacement of the lens focusing wheel. Brightness Control.

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