KR19990036189U - D.P Projector - Google Patents

Abstract

The present invention relates to a DLP (Digital Light Processing) projector that detects some color-specific frames and detects the amount of light for each part of the image to obtain an illuminated image with uniform brightness. The digital light processing (DLP) projector by placing the color filter disc 30 inclined at a predetermined angle so as to selectively reflect some color light of the incident light, and selectively from the color filter disc 30 Photo detector provided with a collimating lens 2 (70) for irradiating the color light reflected upwardly in parallel with the detection surface (80 ') to detect the light irradiated in parallel from the collimating lens (2 70) (Photo) Detector 80 and a driver 90 for detecting the amount of light for each part in the photo detector 80 to control each mirror 51 of the digital mirror device (DMD) 50 according to the amount of illumination light Consists of brightness and cont By providing excellent harmony between the last not only can improve the luminous efficiency, but also has the effect of obtaining a clear image.

Description

D.P Projector

The present invention relates to a DLP (Digital Light Processing) projector, and more particularly to a DLP (Digital Light Processing) projector that detects the amount of light in each area to obtain a uniform image. It is about.

In general, DLP (Digital Light Processing) projectors have improved the ability to reproduce primary colors by eliminating pixel mosaic, which is a disadvantage of liquid crystal display (LCD) projectors. It is possible to obtain large color images with high brightness and vividness in fields such as presentations such as education and advertisements or entertainments such as movies.

Such a DLP (DLP) projector includes a lamp 10, a condenser lens 20 for focusing and irradiating a beam emitted from the lamp 10, and a condenser on the condenser lens 20. The color filter disc 30 which separates the white light into R, G and B to illuminate R, G and B by 1/3 for each frame, and the color divergent light emitted from the color filter disc 30 Collimating the lens in parallel with the collimating lens, a digital reflector (DMD: Digital Mirror Device) (50) to form an image by adjusting the reflection angle for each pixel of the color-specific light focused by the collimating lens 40, and It is composed of a projection lens 60 for projecting the image formed by the digital mirror device (DMD: 50) on the screen (S), which will be described in more detail as follows.

The digital mirror device (DMD) 50 is a combination of devices known as a microelectromechanical (MEM) system, and such a microelectromechanical (MEM) device includes a pressure sensor and an accelerometer. And micro actuators. The digital mirror device (DMD) 50 is constituted by a C.O.MS (CMOS) type process on a C.O.MS (CMOS) as a single crystal. Each digital mirror device (DMD) 50 includes a 16 μm square aluminum mirror 51 capable of reflecting light in one or two directions depending on the state of the basic memory cell. This rotation of the mirror 51 is accomplished through the electrostatic attraction generated by the voltage difference formed between the mirror 51 and the basic memory cell. The mirror 51 rotates +10 degrees according to the memory cell in the (1) state, and the mirror 51 rotates -10 degrees according to the memory cell in the (0) state.

By the combination of projection optics and a suitable light source and a digital mirror device (DMD) 50, the mirror 51 reflects incident light to / from the projection lens 60 by a single light adjustment technique. . Therefore, the mirror 51 in the (1) state appears bright, and the mirror 51 in the (0) state appears dark so that a desired image can be obtained by a combination thereof.

However, the DLP (DLP) projector configured as described above has a light amount emitted from the lamp and incident into the optical system, as shown in FIG. 2, which is not uniform and moves away from the center of the lens. There was a problem that the light intensity worsens.

An object of the present invention is to solve the conventional problems as described above, in particular, by detecting some color-specific frames to detect the amount of light for each part of the image D.L to obtain an image with uniform brightness DLP (Digital Light Processing) Projector

In order to achieve the above object, a DLP (DLP) projector of the present invention is a color filter original inclined at a predetermined angle so as to selectively reflect some color light of incident light, and the color filter original. A collimator lens 2 for selectively irradiating the reflected color light in parallel, a photo detector for detecting light irradiated in parallel from the collimation lens 2, and the amount of light for each part of the light detector, Characterized in that it comprises a drive for controlling the gray scale (Grey Scale) to fit.

1 is a perspective view showing the configuration of a typical DLP projector.

2 is a graph showing the shape of divergent light in a general lamp.

3 is a schematic perspective view showing the outside of a general digital reflector (DMD).

4 is a schematic diagram showing the light formation principle of a typical DLP projector.

5 is a perspective view showing the configuration of a DLP projector to which the present invention is applied.

Explanation of symbols for main parts of the drawings

10: lamp 20: condenser lens

30: color filter disc 40: collimating lens

50: digital reflector (DMD) 60: projection lens

70: collimating lens 2 80: sensor

90: drive part

Hereinafter, with reference to the accompanying drawings, the configuration, operation and operation effects for an embodiment according to the technical idea of the present invention D. L. (DLP: Digital Light Processing) projector configured as described above in detail as follows. 5 is a perspective view showing the configuration of a DLP projector to which the present invention is applied.

The DLP digital light processing (DLP) projector to which the present invention is applied includes a lamp 10, a condenser lens 20 for condensing and irradiating a beam emitted from the lamp 10, and the condenser lens. A color filter disc 30 which separates the white light focused at 20 into R, G, and B and illuminates R, G, B by 1/3 for each frame, and emits light from the color filter disc 30 A collimating lens 40 for irradiating the divergent light of each color in parallel, and a digital reflector (DMD: Digital Mirror Device) for forming an image by adjusting the reflecting angle of each pixel of the color-specific light focused by the collimating lens 40 ( 50 and a projection lens 60 for projecting an image formed by the digital mirror device (DMD) 50 onto the screen S. As shown in FIG.

In such a digital light processing (DLP) projector, the present invention arranges the color filter disc 30 to be inclined at a predetermined angle so as to selectively reflect some color light of the incident light, and the color filter disc ( 30 is provided with a collimating lens 2 (70) for selectively irradiating the color light reflected upwardly upward, and a sensing surface (80 ') is provided to detect the light irradiated in parallel from the collimating lens (2 70) The photo detector 80 and the light detector 80 sense the amount of light for each part to control each mirror 51 of the digital mirror device (DMD) 50 according to the amount of illumination light. It consists of a drive unit (90).

Therefore, the present invention configured as described above, while R is transmitted by the color filter disc 30 is disposed obliquely at the predetermined angle, G, B is reflected upwards, and the sensing surface through the collimating lens 2 (70) Focused at 80 ', it is detected by the photodetector 80.

As such, the amount of light of each part detected by the photodetector 80 is fed back to the driving unit 90 for adjusting the angle of each mirror 51 of the digital mirror device (DMD) 50 for each part. By controlling the gray scale according to the amount of illumination light, it is displayed with uniform illumination and compared with the diffraction reference optical switch, the light adjustment operation of the digital mirror device (DMD) 51 is controlled with the brightness of the system. Excellent contrast can be provided between contrasts.

As described above, the present invention D.L.D. (DLP) projector can improve the luminous efficiency by detecting the amount of light for each part of the image to obtain an illuminated image with uniform brightness. Not only that, but it also has the effect of obtaining a clear image.

Claims (1)

The condenser lens 20 focusing and irradiating the beam emitted from the lamp 10 and the white light focused by the condenser lens 20 are separated into colors R, G, and B, and 1/3 of each frame is R, A color filter disc 30 for illuminating G and B, a collimating lens 40 for irradiating parallel divergent light emitted from the color filter disc 30, and a color focused by the collimating lens 40 The image formed by the digital mirror device (DMD) 50 and the digital mirror device (DMD) 50 for forming an image by adjusting the reflection angle for each pixel of the star light is screened. In a DLP: Digital Light Processing (DLP) projector composed of a projection lens 60 projecting onto Collimating lens 2 (70) for arranging the color filter disc 30 to be inclined at a predetermined angle so as to selectively reflect some color light of the incident light, and to irradiate the color light selectively reflected upward from the color filter disc 30 in parallel )Wow; A photo detector (80) having a detection surface (80 ') so as to detect light irradiated in parallel from the collimating lens (2); The optical detector 80 detects the amount of light for each part and includes a driver 90 for controlling each mirror 51 of the digital mirror device (DMD) 50 according to the amount of illumination light. DLP (Digital Light Processing) projector.