KR20040061807A - Position adjusting apparatus of polarizing panel in LCD projector - Google Patents

Abstract

PURPOSE: A system for adjusting the position of a polarizer of an LCD(Liquid Crystal Display) projector is provided to improve the quality of an image by realizing the optimal contrast ratio in an LCD projector. CONSTITUTION: A system for adjusting the position of a polarizer of an LCD projector comprises a polarizer fixing plate including a polarizer fixing unit(131), an opening on which a lens(150) is placed and front and rear protrusions(133,134) formed on the rim of the opening, a mounting guide(116) formed on the upper side of an optical engine and having a fastening hole aligned with a slit(136), and a fastening member(140) inserted to the fastening hole after the position of the polarizer is adjusted and fixed on the polarizer fixing plate.

Description

Position adjusting apparatus of polarizing panel in LCD projector

The present invention relates to a polarizing plate position adjusting device of an LCD projector that can improve the contrast of the projected image by adjusting the position of the polarizing plate of the LCD projector. More specifically, the present invention relates to a polarizing plate positioning device capable of improving the contrast of light incident on a screen by a projector by allowing a polarizing plate formed before and after the liquid crystal layer in an LCD projector to be formed in a vertical direction accurately.

In general, an LCD projector receives an image signal from a computer, a camcorder, a DVD, a VTR, and the like, and projects the image signal on a large screen to perform various presentations or multimedia education. to be. In addition, the projector itself may be mounted inside the device to operate as a projection television.

The optical system of a general LCD projector which is widely used as the above uses will be described below.

1 is a diagram illustrating an optical system of an LCD projector.

Referring to FIG. 1, the optical system 100 of an LCD projector includes a lamp 10 generating white light, a reflector 20 for collecting white light generated by the lamp 10 and reflecting it in one direction, and the reflector 20 FEL (Fly Eye Lens) lens 30 to match the illumination area of the white light reflected through the light to the size of the LCD panels 80a, 80b, and 80c and to uniform the light intensity, and the FEL lens Total reflection mirrors 40a, 40b, 40c, 40d reflecting the white light adjusted at 30, a condensing lens 50 whose light straightness is corrected, and light of a certain color pass Color filters 60a and 60b for reflecting all of them, dichroic lenses 70a, 70b and 70c in which light of a certain color passing through the color filters 60a and 60b is once again filtered; It is generated in the LCD panels 80a to 80c and the LCD panels 80a to 80c which are activated by light of a certain color passing through the dichroic lenses 70a to 70c. An enlarged image been combined in a dichroic prism 90, a dichroic prism 90 and, by the dichroic dichroic which an image of a certain color combination is converted into a complete image comprises a projection lens (95) for projecting onto a screen.

On the other hand, formed between the first polarizing plates (71a) (71b) (71c) attached to the front of the dichroic lens (70a ~ 70c), the LCD panel (80a ~ 80c) and the dichroic prism 90 Second polarizing plates 81a, 81b, 81c are included. The polarizing plates 71a to 71c and 81a to 81c are fixed in a state in which the polarization axes are perpendicular to each other so that an image formed on the LCD panels 80a to 80c can be transmitted or blocked accurately.

Briefly describing the operation of the projector as described above, after the light irradiated from the lamp passes through the red, green, and blue tricolor images generated in the three LCD panels 80a to 80c, the dichroic prism 90 Are combined into a complete image. In addition, the combined image is realized as an image enlarged on the screen through the projection lens 95 to provide a clear and lively image of a large screen to the user.

In the LCD projector having such characteristics, each optical component constituting the illumination system, in particular, a pair, is used to optimally display the brightness (surface brightness) and contrast (color contrast), which are the performance indicators of the LCD projector. It is of utmost importance that the polarizer maintains vertical alignment.

In particular, since the second polarizing plate 81 formed on the rear side of the LCD panel 80 with respect to the traveling direction of the light is generally fixed to the dichroic prism 90 in advance, the front side of the LCD panel 80 Stable position fixing of the first polarizing plate 71 to be formed is an important problem. In other words, it is important that the first polarizing plate 71 is completely orthogonal to the polarization axis of the second polarizing plate 81.

2 is a view for explaining the installation structure of a conventional dichroic lens with a polarizing plate.

2, the first dichroic lens 70 is attached to the conventional dichroic lens 70 so as to pass only light in one axis and absorb the rest, and the dichroic lens 70 is a mounting member on the side of the optical engine. The cutting surface 72 which cut | disconnected the lower surface of the dichroic lens 70 horizontally so that it may not be twisted in (1) is included.

In addition, the mounting member 1 is a mounting portion (2) formed at a predetermined height from the bottom surface for mounting the dichroic lens (70), and the dichroic lens (70) on the left and right vertical surfaces of the mounting portion (2) ) Is provided with a slide groove 2a of a predetermined depth and a mounting portion 26 on which the cutting surface 72 of the dichroic lens 70 may be seated.

On the other hand, the first polarizing plate 71 is attached to the dichroic lens 70 so that the polarization direction whose transmission direction is orthogonal to the second polarizing plate 81 coincides with the cutting surface 72 of the lens. In addition, the cutting surface 72 formed on the lower surface of the dichroic lens 70 is formed so that the polarization direction of the polarizing plate 71 is not twisted due to rotation or shaking of the dichroic lens 70. to be.

In this case, the bottom surface of the dichroic lens 70 and the bottom surface of the mounting part 2 of the mounting member 1 into which the dichroic lens 70 is inserted and fixed are formed in the horizontal direction. In order to solve the hassle for catching the movement of the dichroic lens 70 is fixed in.

However, when the polarizing plate 71 is not attached in parallel with the cutting surface 72 of the dichroic lens 70, the polarization direction of the polarizing plate 71 is distorted, so that the polarizing plate 71 is properly attached to the LCD panel 80. There is a problem that can not control the brightness of the light due to the performance of the device is degraded because the light is not transmitted, that is, there is a problem that the contrast worsens.

In particular, even if the polarizing plate 71 is properly attached, if the mounting portion 2b formed on the mounting member 1 which is in contact with the cutting surface 72 of the dichroic lens 70 is not accurately processed horizontally, the polarization direction is properly aligned. Problems occur such as not alignment.

In order to solve the problems as described above of the present invention, the polarization direction of each polarizing plate before and after the center of the LCD panel can be fixed in a state that maintains exactly perpendicular, thereby improving the contrast of the image formed on the screen We propose a polarizer positioning device for an LCD projector.

In addition, the present invention proposes an apparatus for adjusting the position of a polarizing plate which observes an image formed on a screen and can confirm an orthogonal state with respect to a pair of polarizing plates.

In addition, the present invention proposes a polarizing plate position adjusting device of the LCD projector that the user can conveniently adjust the position of the polarizing plate.

1 is a view illustrating an optical system of a general LCD projector.

2 is a view for explaining the installation structure of a conventional dichroic lens with a polarizing plate.

3 is an exploded perspective view of the polarizer positioning device according to the present invention.

4 is a perspective view of the polarizing plate position adjusting device according to the present invention.

5 and 6 are views showing the operation of the position adjusting device of the polarizing plate according to the present invention.

<Explanation of symbols for the main parts of the drawings>

110: guide portion 115: top surface of the optical engine 116: mounting guide

117: tightening hole 118: guide projection 120: side of the optical engine

121: lower insertion hole 122: lower guide

130: polarizing plate fixing plate 131: polarizing plate fixing portion

132: opening 133: front projection 134: rear projection

135: bend portion 136: long hole 137: position guide

140: fastening member 150: lens 151: polarizing plate

Polarizing plate position adjusting device of the LCD projector according to the present invention for achieving the object as described above, the polarizing plate fixing portion to which the polarizing plate is fixed to the opening, and the bent hole is formed in the bent portion formed on the upper side of the polarizing plate fixing portion A polarizing plate fixing plate that is additionally included; A mounting guide formed on an upper surface of the optical engine and having a tightening hole aligned with the long hole; After the position of the polarizing plate is adjusted, the fastening member is inserted into the fastening hole and the polarizing plate fixing plate is fixed.

By the polarizing plate position adjusting device of the projector as described above, the position of the polarizing plate can be precisely adjusted, and the position of the adjusted polarizing plate can be maintained firmly.

Further, even if the position of the second polarizing plate formed behind the LCD panel is distorted by a certain degree with respect to the traveling direction of the light, since the position of the first polarizing plate can be adjusted by a certain degree or more, the pair of polarizing plates mutually More precise verticals.

Hereinafter, with reference to the drawings present a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the embodiment as presented, and another embodiment according to the spirit of the present invention can be easily presented by adding, deleting, changing, or the like.

3 is an exploded perspective view of the position adjusting device of the polarizing plate according to the present invention.

Referring to Figure 3, the polarizing plate position adjustment device of the LCD projector according to the present invention can adjust the position of the first polarizing plate in front of the LCD panel in the direction of the light, the main configuration of the present invention is that the polarizing plate is supported And a guide plate for placing the polarizing plate fixing plate and the polarizing plate fixing plate on the optical engine.

In detail, the polarizing plate fixing plate 130 includes a predetermined lens 150 to which the polarizing plate 151 is attached, a polarizing plate fixing unit 131 to which the lens 150 is fixed, and an approximation of the polarizing plate fixing unit 131. An opening 132 opening in a central portion and the lens 150 placed thereon, a front protrusion 133 and a rear protrusion 134 formed on a plurality of edges of the opening 132, and an upper side of the polarizer fixing part 131. The long hole 136 is formed in the extending portion of the bent portion 135 is bent in the, and the position guide 137 further formed behind the long hole 136 is included. In addition, a fastening member 140 is inserted into the long hole 136 to fix the position of the polarizing plate fixing plate 130. In particular, the bent portion 135 in which the long hole 136 and the position guide 137 are formed is gently curved upward and downward to achieve a predetermined curvature.

In detail, the guide unit 110 includes a mounting guide 116 which is formed by being raised on the upper surface 115 of the optical engine, a tightening hole 117 which is formed in the front surface of the mounting guide 116 in the front, A guide protrusion 118 is formed at the rear of the tightening hole 117 and inserted into the position guide 137. In addition, the lower side guide 122 and the lower insertion hole 121 are disposed on the side surface 120 of the optical engine so that both sides of the lower end of the polarizing plate fixing plate 130 do not move back and forth, but only move to the left and right within a predetermined range. Is formed. On the other hand, the upper surface 115 of the optical engine may be an upper case covering the upper portion of the optical engine.

In more detail, the lens 150 is preferably a transparent plate for attaching a separate polarizing plate 151 rather than a dichroic lens applied to an illumination system. However, the dichroic lens is not excluded from being used, but preferably, a separate lens is used for reliability of the optical axis or convenience of manufacturing. In addition, a separate lens is preferably used for cooling due to the nature of the polarizing plate 151 to absorb heat.

In addition, the front protrusion 133 is to support the front surface of the lens 150, and one is formed on the upper side and two on the lower side. And, the rear projections 134 are formed on each of the two upper and lower sides, one on each side. It is formed in this way to be fixed without being pulled out before and after the opening 132 of the lens 150.

In addition, after the lens 150 is fixed to the front protrusion 133 and the rear protrusion 134, the bonding liquid is injected into and fixed to the at least one protrusion 133 or 134, thereby fixing the lens once fixed ( 150) do not swing. Preferably, the protrusion into which the bonding liquid is injected may be a front protrusion 133 formed at an upper side thereof.

On the other hand, both sides of the lower end of the polarizing plate fixing part 131 is chamfered so as to be inserted into the lower insertion hole 122, so that the polarizing plate fixing plate 130 does not become an obstacle to move at a predetermined angle (range of 20 degrees) from side to side. .

In addition, a fastening member 140 including a head having a diameter larger than at least the width of the long hole 136 is inserted into the long hole 136.

The mounting guide 116 is gently curved so that the upper surface of the mounting guide 116 has a predetermined curvature so that the mounting guide 116 is interviewed with the bent portion of the polarizing plate fixing plate 130. Therefore, it can move from side to side smoothly. In addition, the tightening hole 117 is to insert the tightening member 140 so that its position is fixed, so that the tightening member 140 is firmly supported after the tightening member 140 is inserted. In addition, it is preferable that not only the upper surface of the mounting guide 116 is penetrated, but a predetermined boss is formed at the lower side of the mounting guide 116 so that the inserted outer circumference of the tightening member 140 may be protected.

In addition, in the guide protrusion 118, the width is equal to or slightly smaller than the width of the position guide 137, and the length is slightly longer than the width, so that the guide protrusion 118 is the position guide 137 Allows to move smoothly inside the.

A process of forming the polarizer positioning device of the projector having the configuration as described will be described.

After the polarizer 151 is attached to the lens 150, the front and rear surfaces thereof are guided by the front protrusion 133 and the rear protrusion 134 to fix the position. In addition, a bonding liquid is injected into the at least one protrusion 133 and 134 so that the lens 150 is fixed so as not to swing.

The polarizing plate fixing plate 130 to which the lens 150 is fixed is mounted to the guide unit 110. In detail, the polarizing plate fixing plate 130 is mounted, and the guide protrusion 118 is the position guide ( The fastening member 140 is inserted into the fastening hole 117 and the long hole 136, and the fastening member 140 is inserted into the fastening hole 117 and the long hole 136 which are aligned and aligned. In addition, both lower ends of the polarizer fixing part 131 are placed in the lower insertion hole 121.

By this operation, the polarizing plate fixing plate 130 is placed on the guide part 110, thereby forming a polarizing plate position fixing device.

In FIG. 4, the polarizing plate fixing plate 130 is placed on the guide part 110 by fixing as described above.

After the polarizing plate fixing plate 130 is placed on the guide unit 110, the projector is operated for a predetermined time to adjust the angle of the polarizing plate while observing the screen.

5 and 6 show the operation of the position adjusting device of the polarizing plate according to the present invention.

FIG. 5 shows that the first polarizing plate is inclined counterclockwise. In this case, since the forming direction of the second polarizing plate formed behind the LCD panel is rotated in the counterclockwise direction, the LCD panel is inclined. The first polarizer in front of the is also inclined counterclockwise. By doing in this way, the polarization axis of a polarizing plate can be made to make a perpendicular perpendicular relationship.

FIG. 6 is a view in which the first polarizing plate is inclined counterclockwise, and in this case, the forming direction of the first polarizing plate formed behind the LCD panel is also inclined counterclockwise.

On the other hand, the first polarizing plate can be inclined clockwise or counterclockwise, not only the mounting guide 116 is bent up and down by a predetermined curvature, but also the bent portion 135 in which the long hole 136 is formed is predetermined. This is because the curvature of the bent, the curvature is adjusted so that the operator's work efficiency may be improved.

As described above, the operation of adjusting the position of the first polarizing plate 151 is performed while watching the image projected on the screen while the projector is in operation, based on the state that the light transmitted through the LCD panel should be black. The first polarizing plate 151 is rotated clockwise or counterclockwise in a state where the contrast ratio is greatest, that is, in the darkest state, to be fixed.

In the case of black which comes out relatively bright while rotating the first polarizing plate 151, the polarizing axes of the first polarizing plate 151 and the second polarizing plate are not completely orthogonal. In such a case, the first polarizing plate 151 While rotating), the first polarizing plate 151 is rotated with a polarization axis that is exactly orthogonal to find an orthogonal state.

On the other hand, the lower guide 122 is formed by rotating the first polarizing plate 151 clockwise or counterclockwise to prevent the lens 150 from moving forward or backward (under or behind the ground). 1 The alignment state of the polarizing plate 151 is not disturbed back and forth. In addition, the guide protrusion 118 and the position guide 137 allow the polarizing plate fixing plate 130 to move only to the left and right even in a state where the fastening member 140 is separated, so that the operator adjusts the position of the polarizing plate. Promote convenience.

In addition, after the angle of the first polarizing plate 151 is aligned, the tightening member 140 is inserted into the tightening hole 117 to fix the position of the polarizing plate fixing plate 130. In detail, the body of the fastening member 140 is inserted into the inside of the tightening hole 117, the head portion is caught by the upper side of the long hole 136, the polarizing plate fixing plate 130 by the tightening member 140 Is strongly fixed.

After the angle adjustment of the first polarizing plate 151 is completely performed and the fastening member 140 is inserted and fixed, a weak vibration or the like that is continuously applied by injecting a bonding liquid to the adjacent position of the fastening member 140 and fixing the same. By doing so, the position of the polarizing plate 151 is not misaligned.

Polarizing plate position adjusting devices as described above are respectively formed in front of the red green blue tricolor LCD panel, so that the contrast ratio for each color can be made optimal.

The present invention is provided in front of the LCD panel without dismantling the device even when the installation angle of the second polarizing plate provided behind the LCD panel is set differently from the intention of the operator and rotated to a certain degree. By adjusting the polarizing plate position adjusting device, an optimum image quality can be realized.

According to the present invention, it is possible to realize the best image quality by implementing the highest contrast ratio in the LCD projector.

In addition, by adjusting the two polarizing plates formed before and after the LCD panel in the course of the work again in the final process of the work, there is an effect that can reduce the labor of the operator during the manufacturing process.

Claims (8)

A polarizing plate fixing plate including a polarizing plate fixing part to which the polarizing plate is fixed, and a bent part having a long hole formed at a bent portion above the polarizing plate fixing part; A mounting guide formed on an upper surface of the optical engine and having a tightening hole aligned with the long hole; And a tightening member inserted into the tightening hole after the position of the polarizing plate is adjusted to be fixed to the fixing plate of the polarizing plate. The method of claim 1, And the mounting guide and the bent portion are bent up and down with a predetermined curvature. The method of claim 1, The polarizing plate is fixed to the position by the projection of the outer periphery of the opening, the polarizing plate position adjustment device of the LCD projector, characterized in that the bonding liquid is injected and fixed to at least one projection. The method of claim 1, The mounting guide is a polarizing plate position adjustment device of the LCD projector, characterized in that the projection formed from the top surface of the optical engine. The method of claim 1, A guide protrusion formed on the upper surface of the mounting guide, And a position guide further formed in the bent portion to be aligned with the guide protrusion. The method of claim 1, A position guide formed to be long at the bent portion; Raised plate upper position of the mounting guide is a polarizing plate position adjustment device of an LCD projector, characterized in that the position guide and the width of the matching or smaller, the length is larger than the width of the guide projections are included. The method of claim 1, The position of the polarizing plate after the position of the polarizing plate is adjusted to the adjacent position of the fastening member, the polarizing plate position adjustment apparatus of the LCD projector, characterized in that the bonding is strongly fixed. A polarizing plate fixing plate including a polarizing plate fixing part to which a polarizing plate is fixed to an opening portion, and a bent part having a position guide formed at a bent portion above the polarizing plate fixing part; A mounting guide formed on an upper side of the optical engine and having guide protrusions aligned with the position guide; And a fixing means for moving the bent portion in contact with the mounting guide to fix the position after the angle of the polarizing plate fixing plate is adjusted.