JP2008070494A - Fine positioning drive unit of liquid crystal display element, optical engine having liquid crystal display element, and liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the fine positioning drive unit of liquid crystal display element capable of precisely positioning a liquid crystal display element without being affected by the time change of UV adhesive and the positional deviation of the liquid crystal display device due to soldering fixation. <P>SOLUTION: In the fine positioning drive unit of liquid crystal display device, the position of the liquid crystal display element 2 is detected by a position detection means 19, the detected position of the liquid crystal display element 2 is compared with a reference value which is preliminarily set, a fine adjustment means 12 composed of a moving magnet, for example, of a positioning driving means 3 is driven and controlled to position the liquid crystal display element 2, the positioning control of the liquid crystal display element 2 is properly performed, the positional deviation of the liquid crystal display element 2 is corrected and, thereby, an image of high-precision quality can be obtained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fine-positioning driving device for a liquid crystal display element that synthesizes and displays image light of each color from a liquid crystal display element used in a front projector or rear projector by a combining means, an optical engine having the liquid crystal display element, and a liquid crystal display device In particular, the present invention relates to positioning control of a liquid crystal display element that performs high-precision alignment adjustment between the liquid crystal display element and each color light combining means and eliminates the occurrence of a change with time after alignment adjustment.

  Conventionally, optical means for separating light from a light source into red, blue and green light, a liquid crystal display element and driving means for modulating each light, and composition for combining red, blue and green modulated by the liquid crystal display element In a liquid crystal projector having a means and a projection lens for projecting a synthesized image, a liquid crystal display element has been performed by a complicated mechanical mechanism when aligning the liquid crystal display element to the color light combining means.

  On the other hand, recently, with the miniaturization and high definition of the liquid crystal display element size, a high-precision fixing method is becoming mainstream, and an adhesive method and a solder fixing method are generally used for fixing. . As a method using such an adhesive, as shown in Patent Document 1, there is known a method in which adhesion is performed after alignment adjustment between a liquid crystal display element and each color light combining means.

  However, in the method of bonding after alignment adjustment as described in Patent Document 1, it is difficult to maintain the quality because of the change over time, and the high accuracy associated with the downsizing and high definition of the liquid crystal display element size. There is a problem in adopting it as a fixing method for adjustment. In addition, this method requires an adjustment member for adjusting the position of the liquid crystal display element, which increases the number of parts, accumulates errors in accuracy, and increases the adjustment allowance. Have. In addition, the soldering method requires a large amount of equipment, and requires a large capital investment.

As a method for improving them, the liquid crystal display element mounting method disclosed in Patent Document 2 is a method in which a liquid crystal display element is attached to a synthesizing unit via an intermediate member having a temporary fixing UV temporary fixing portion and a permanent fixing solder fixing portion. I try to install it. That is, the liquid crystal display element is aligned and temporarily fixed to the synthesizing means via the UV temporary fixing portion provided on the intermediate member, and then fixed by the solder fixing portion provided on the intermediate member.
Japanese Patent Laid-Open No. 10-10994 Japanese Patent Laid-Open No. 2001-1000018

  However, in the mounting method of the liquid crystal display element disclosed in Patent Document 2, high heat is generated when the liquid crystal display element is temporarily fixed to the synthesis means with the UV temporary fixing part and then soldered with the solder fixing part. When the temperature of the UV adhesive reaches the glass transition temperature as a result of being transmitted to a metal part such as a metal part, the metal part thermally expands and pixel displacement occurs.

  The present invention improves such disadvantages and controls the positioning of the liquid crystal display element in the synthesizing means without performing UV bonding or soldering. It is an object of the present invention to provide a fine-positioning driving device for a high-definition liquid crystal display element that is positioned with high accuracy without being affected by the above, an optical engine having the liquid crystal display element, and a liquid crystal display device.

  The liquid crystal display element fine movement positioning drive device according to the present invention includes a holding member for holding the liquid crystal display element, an elastic support member for finely connecting the holding member to the support member, and a fine movement for moving the holding member by a minute distance. Positioning drive means having position means, position detection means for detecting the position of the liquid crystal display element, and comparing the position of the liquid crystal display element detected by the position detection means with a preset reference value to adjust the fine movement. And a position control means for positioning the liquid crystal display element by driving the means.

  The fine movement means may be formed of a moving magnet.

  Further, it is desirable that the position detecting means is formed of a four-divided light receiving element.

  In addition, an intermediate member having a spherical seat is provided between the holding member that holds the liquid crystal display element and the support member, and the principal point center of the intermediate member is disposed in the vicinity of the pixel center of the liquid crystal display element. desirable.

  An optical engine using the liquid crystal display element of the present invention is characterized by having a fine positioning driving device for the liquid crystal display element.

  The liquid crystal display device of the present invention includes a liquid crystal display element that modulates each light beam of illumination light obtained by separating light from a light source into light beams of a plurality of colors, and a light combining unit that combines each light beam modulated by the liquid crystal display element, In the liquid crystal display device having a projection unit for projecting the image light synthesized by the light synthesizing means, a holding member for holding each of the liquid crystal display elements of the plurality of colors, and a support member for a support case of the liquid crystal display device A positioning drive means having an elastic support member that is movably connected to the head, a fine movement means for moving the holding member by a minute distance, a position detection means for detecting the position of the liquid crystal display element, and detection by the position detection means A position control for positioning each liquid crystal display element by comparing the position of each liquid crystal display element with a reference value set in advance to drive and control the fine movement means. Characterized by comprising a fine positioning drive device of a liquid crystal display element and means.

  A fixing member for fixing any one of the liquid crystal display elements of the plurality of colors after alignment adjustment; and the position control means is configured to use another liquid crystal display element based on the position of the liquid crystal display element fixed to the fixing member. The position may be controlled.

  Further, it is desirable that the position detecting means is provided on the screen for each of the liquid crystal display elements of the plurality of colors.

  Further, the position detecting means may be provided in common with the liquid crystal display elements of the plurality of colors at a position other than the image display area of the screen.

  Further, the position detecting means may be provided in common with the liquid crystal display elements of the plurality of colors at a position near the screen.

  Further, an optical path deflecting unit that deflects a part of the light from the light combining unit may be provided, and the position detecting unit may be provided in the optical path deflected by the optical path changing unit.

  Further, an optical path deflecting unit that deflects light provided on a holding member that holds each of the liquid crystal display elements of the plurality of colors, and a light source that makes light incident on the optical path deflecting unit are provided, and the position detecting unit is the optical path deflecting unit You may make it receive the reflected light from.

  It is desirable to have a minute position adjusting means for adjusting the position of the position detecting means.

  Further, an intermediate member having a spherical seat is provided between the holding member for holding the liquid crystal display elements of the plurality of colors and the support member, and the principal point center of the intermediate member is disposed in the vicinity of the pixel center of the liquid crystal display element. It is desirable to do.

  According to the present invention, the position of the liquid crystal display element is detected by the position detecting means, and the position of the detected liquid crystal display element and a preset reference value are compared by the position control means to drive and control the fine movement means of the positioning drive means. Thus, the liquid crystal display element is positioned, so that the liquid crystal display element can be appropriately controlled, and a high-definition image can be stably obtained by correcting the positional deviation of the liquid crystal display element.

  Further, by forming the fine movement means with a moving magnet, the liquid crystal display element can be positioned with a simple configuration and the power consumption can be reduced.

  Further, by forming the position detecting means with a four-divided light receiving element, it is possible to detect the positional deviation of the liquid crystal display element with high accuracy and position the liquid crystal display element with high accuracy.

  In addition, an intermediate member having a spherical seat is provided between the holding member and the support member that respectively hold the liquid crystal display elements, the center point of the intermediate member is disposed in the vicinity of the pixel center of the liquid crystal display element, and the inclination of the intermediate member is set. By adjusting, the tilt of the liquid crystal display element can be adjusted, and the high-definition image can be obtained by removing the focus blur.

  Further, by providing the liquid crystal display element fine movement positioning drive device of the present invention in an optical engine using a liquid crystal element, it is possible to stably obtain a high-definition image by correcting the positional deviation of the liquid crystal display element. .

  In the liquid crystal display device of the present invention, the position of the liquid crystal display elements of a plurality of colors is detected by the position detection means, and the position of each detected liquid crystal display element and a preset reference value are compared by the position control means for positioning driving. Since each liquid crystal display element is positioned by driving and controlling the fine movement means, the positioning control of each liquid crystal display element can be performed as appropriate, and the positional deviation of the liquid crystal display elements of multiple colors can be corrected to achieve high definition. An image with high image quality can be obtained stably.

  In addition, the liquid crystal display element includes a fixing member that fixes any one of the liquid crystal display elements of a plurality of colors after alignment adjustment, and the position control unit uses the position of the liquid crystal display element fixed to the fixing member as a reference for the other liquid crystal display elements. By controlling the position, the configuration of the positioning drive device can be simplified and positioning control can be facilitated.

  Further, by providing the position detection means at a position other than the screen or the image display area of the screen, the position detection sensitivity of the liquid crystal display element can be increased and a higher definition image can be obtained.

  Further, by providing the position detecting means in the vicinity of the screen in common with the liquid crystal display elements of a plurality of colors, the position of the liquid crystal display element can be detected with a simple configuration and the power consumption can be reduced.

  In addition, by providing an optical path deflecting unit that deflects a part of the light from the light combining unit and providing a position detecting unit on the optical path deflected by the optical path changing unit, the liquid crystal display device of either the front projector or the rear projector has a pixel shift. Can be prevented.

  Furthermore, an optical path deflecting unit that deflects light provided on a holding member that holds each of the liquid crystal display elements of a plurality of colors and a light source that makes light incident on the optical path deflecting unit are provided, and the position detecting unit is a reflected light from the optical path deflecting unit. By receiving the light and detecting the position of the liquid crystal display element, the position of the liquid crystal display element can be detected with a simple layout.

  In addition, by having the minute position adjustment means for adjusting the position of the position detection means, positioning control of other liquid crystal display elements can be performed based on the positions of a plurality of liquid crystal display elements, so that positioning control can be simplified and power consumption can be reduced. Can be reduced.

  Further, a holding member for holding each of the liquid crystal display elements of a plurality of colors and an intermediate member having a spherical seat between the holding member and the support member of the liquid crystal display device are provided, and the principal point of the intermediate member is a pixel of the liquid crystal display element. By arranging in the vicinity of the center, the inclination of each liquid crystal display element can be adjusted, and a high-definition image can be obtained by removing out-of-focus blur.

  1 and 2 show a liquid crystal display device of the present invention, FIG. 1 shows a configuration of a positioning drive device, and FIG. 2 is a perspective view showing a configuration of a projection unit. The liquid crystal display device 1 includes a reflective liquid crystal display element 2, a positioning driving unit 3, a light combining unit 4, a wire grid 5, an illumination light incident unit 6, and a projection unit 7. A deflection beam splitter may be provided instead of the wire grid 5.

  The liquid crystal display element 2 is fixed to the lower surface of the liquid crystal display element holding member 8. The positioning driving means 3 of the liquid crystal display element 2 includes an elastic support member that connects the liquid crystal display element holding member 8 holding the liquid crystal display element 2 to a support member 10 protruding in the horizontal direction from the upper part of the support case 9 of the liquid crystal display device 1. 11 and a liquid crystal display element holding member 8 are provided with fine movement means 12 for moving the liquid crystal display element holding member 8 by a minute distance in the X direction and the Y direction. The elastic support member 11 is formed of a coil spring, a leaf spring, or the like, and holds the liquid crystal display element holding member 8 so as to be movable in the X direction and the Y direction with respect to the support member 10. For example, as shown in FIG. 3, the fine movement means 12 includes four magnets 13 a to 13 b, X-direction drive coils 14 a and 14 b, and Y-direction drive coils 15 a and 15 b, and is configured by a moving magnet 16. The magnets 13a to 13b are arranged on the upper surface of the liquid crystal display element holding member 8 so that the north and south poles in the X and Y directions are alternated. The X-direction drive coils 14a and 14b and the Y-direction drive coils 15a and 15b are connected to the support member 10 with a small gap from the four magnets 13a to 13c. Here, only one set of the liquid crystal display element 2 and the positioning drive means 3 is shown in FIG. 1, but the liquid crystal display element 2 and the positioning drive means 3 for three colors of RGB are provided in the support case 9 of the liquid crystal display device 1. Each is provided on three side surfaces of the support case 9.

  The light synthesizing means 4 is provided under the support case 9, and the wire grid 5 is held at an angle of 45 degrees with respect to the synthesizing means 4 by a holding member (not shown). The illumination light incident unit 6 makes illumination light incident on the liquid crystal display element 2 through the wire grid 5. As shown in FIG. 2, the projection unit 7 includes a projection lens 17 and is provided on the emission side of the light combining unit 4.

  The illumination light from the illumination light incident part 6 is transmitted through the wire grid 5 and incident on the liquid crystal display element 2, and only the desired pixels are driven and reflected by rotating the polarization direction by 90 degrees. The light is reflected by the grid 5 and enters the light combining means 4. RGB image light is simultaneously incident on the light combining unit 5 from the liquid crystal display element 2 of RGB and is combined and incident on the projection unit 7 and projected onto the screen 18 by the projection lens 17. Position detecting means 19 for detecting the position of the liquid crystal display element is provided at the end of the image area projected on the screen 18 or at a position away from the image area. As the position detection means 19, for example, as shown in FIG. 4, a case where three sets of four-divided light receiving elements 19a to 19d corresponding to the three colors of RGB will be described.

As shown in the block diagram of FIG. 5, the control device of the liquid crystal display device 1 has a position control unit 22 having an arithmetic processing unit 20 and a drive control unit 21 for each RGB. The arithmetic processing unit 20 applies the spot light signal from the four-divided light receiving element 19a to the A, the spot light signal from the four-divided light receiving element 19b to the B, and the spot light signal from the four-divided light receiving element 19c to the C. When the spot light signal from the light receiving element 19d is D, the spot light signals from the four-divided light receiving elements 19a to 19d are input, and the vertical and horizontal spot positions are calculated by the following equations.
Vertical spot position detection signal = (A + B) − (C + D)
Left / right spot position detection signal = (A + C) − (B + D)
The drive control unit 21 compares the vertical spot position detection signal calculated by the calculation processing unit 20 and the horizontal spot position detection signal with a preset reference value, and calculates the vertical spot position calculated by the calculation processing unit 20. The control current or control voltage supplied to the X direction drive coils 14a and 14b and the Y direction drive coils 15a and 15b is controlled so that the detection signal and the spot position detection signal in the left and right direction coincide with the reference value. Perform position control.

  The operation when the position of the liquid crystal display element 2 is controlled in the liquid crystal display device 1 will be described with reference to the flowchart of FIG. First, illumination light is incident on the liquid crystal display element 2, and the light reflected by the liquid crystal display element 2 is condensed by the projection lens 17 onto the four-divided light receiving elements 19a to 19d on the screen 18 as convergent light (step S1). Spot light signals A to D from the four-divided light receiving elements 19a to 19d are input to the arithmetic processing unit 20 (step S2). The arithmetic processing unit 20 calculates the spot position detection signal in the vertical direction and the spot position detection signal in the horizontal direction from the input spot light signals A to D, and outputs them to the drive control unit 21 (step S3). The drive control unit 21 compares the input spot position detection signal with a reference value, and controls the spot position detection signal to flow through the X direction drive coils 14a and 14b and the Y direction drive coils 15a and 15b so as to match the reference value. Control current or control voltage. The control current or control voltage supplied to the X direction drive coils 14a and 14b and the Y direction drive coils 15a and 15b is controlled (step S4). The position of the liquid crystal display element 2 is adjusted by finely moving the magnets 13a to 13c fixed to the liquid crystal display element holding member 8 by the magnetic fluxes of the X direction drive coils 14a and 14b and the Y direction drive coils 15a and 15b. This position adjustment operation is performed for each of the three liquid crystal display elements 2 of RGB, and RGB pixels can be matched on the screen 18.

  In this way, conventional alignment adjustment errors, misalignment due to adhesive curing and soldering, misalignment due to environmental changes such as temperature and humidity, thermal expansion of the support member, or misalignment due to vibration / impact during system transport However, the position of the liquid crystal display element 2 can be appropriately controlled. However, the positional deviation of the liquid crystal display element 2 is corrected. High-definition image quality can be obtained stably.

  In the above description, the case where the moving magnet 16 having the magnets 13a to 13c, the X direction driving coils 14a and 14b, and the Y direction driving coils 15a and 15b fixed to the liquid crystal display element holding member 8 is used as the positioning driving means 3 will be described. However, an ultrasonic motor, a piezoelectric element, a combination of a rack and pinion and a small servo, a cylinder, or the like may be used as the positioning drive means 3. Further, the position of the liquid crystal display element 2 may be controlled by providing a heat ray on a bimetal that is displaced depending on the temperature and controlling the temperature. Further, the liquid crystal display element holding member 8 may be configured as a positioning table 3 by a moving table combining X, Y2 axis linear motion rails to position the liquid crystal display element 2.

  Further, a CCD (charge coupled device) or a PSD (position sensor detector) using the surface resistance of a photodiode may be used as the position detecting means 19.

  Furthermore, as shown in FIG. 7, as the elastic support member 11, the position of the transmissive liquid crystal display element 2 can be stably adjusted by using an X-direction parallel spring 11a and a Y-direction parallel spring 11b. . Thus, in the present invention, the liquid crystal display element 2 can be positioned and controlled by an elastic member or the like regardless of whether it is a reflective type or a transmissive type. Further, the liquid crystal display element 2 is distinguished from a reflective type and a transmissive type, but any configuration can be applied as appropriate.

  Further, when the liquid crystal display element 2 is positioned by the positioning drive means 3 and an image is formed by the liquid crystal display device 1, the liquid crystal display element 2 is moved to 60 Hz by the positioning drive means 3 as shown in, for example, Japanese Patent Application Laid-Open No. 2002-328402. By performing pixel shift that moves by half a pixel in the X and Y directions at about ~ 90 Hz, the resolution can be increased by pixel shift.

  In the above description, the liquid crystal display element 2 for each color of RGB has been described with reference to the position signal of the spot light output from the position detecting means 19. However, as shown in the perspective view of FIG. Any one of the liquid crystal display elements 2, for example, a green G liquid crystal display element 2a is fixed to the support member 10 after adjusting the alignment element, and the other liquid crystal display elements 2b, 2b, The position of the spot light of the position detection means 19 by 2c is compared, and the other liquid crystal display elements 2b and 2c are positioned and controlled so that the three color pixels on the screen 18 formed by the RGB liquid crystal display element 2 match. Anyway. Green G is most suitable for selection as the reference liquid crystal display element 2 because it has high human eye sensitivity.

  Thus, by performing positioning control of the other two liquid crystal display elements 2 on the basis of any one of the RGB liquid crystal display elements 2, it is possible to prevent pixel displacement of the three color liquid crystal display elements 2. At the same time, the configuration of the positioning drive device can be simplified to facilitate positioning control.

  In the above description, the case where the position detecting means 19 for each of the RGB liquid crystal display elements 2 is provided on the screen 18 has been described. However, as shown in FIG. 9, the RGB liquid crystal display elements synthesized by the light synthesizing means 4. The light of the two corresponding pixels may be condensed at one point other than the image display area 18 of the screen 18, and the position detecting means 19 may be provided in the vicinity of the condensing point.

  In this way, by configuring the light of the corresponding pixels of the RGB liquid crystal display element 2 to be collected at one point, it is not necessary to provide the position detecting means 19 for each of the RGB liquid crystal display elements 2. The position detection means 19 can be used to control the positioning of the RGB liquid crystal display element 2, and the configuration of the apparatus can be simplified to reduce the cost.

  In this case, if the reflected light from the RGB liquid crystal display element 2 is turned on at the same time, it is not possible to determine which RGB light is misaligned. Therefore, the reflected light from the RGB liquid crystal display element 2 is sequentially and sequentially arranged in a constant cycle. The liquid crystal display element 2 may be positioned and turned on. Moreover, if the position control unit 22 is provided with a filter, it is possible to reduce the influence of blinking of each liquid crystal display element 2.

  The position detection means 19 provided in the vicinity of the image display area 18a of the screen 18 may be provided with a fine position adjustment means 23 using, for example, an XY stage or a screw for finely adjusting the position in two directions, the horizontal direction and the vertical direction. Thus, if the position of the position detection means 19 can be finely adjusted by the fine position adjustment means 23, for example, the positioning control of the green G liquid crystal display element 2 is turned off, and the liquid crystal display holding the green G liquid crystal display element 2 is held. Reflected light from the green G liquid crystal display element 2 is incident on the position detecting means 19 with the element holding member 8 in the initial position, and the green G light incident on the position detecting means 19 is positioned at the center of the position detecting means 19. The position of the position detection means 19 is finely adjusted by the fine position adjustment means 23 while monitoring the detection signal. At this time, the positioning control of the green G liquid crystal display element 2 is in an OFF state, and the offset current or voltage applied to the X direction drive coils 14a and 14b and the Y direction drive coils 15a and 15b is substantially zero. When the reflected light from the red R and blue B liquid crystal display elements 2 is incident on the position detecting means 19 positioned in this way to control the positioning of the red R and blue B liquid crystal display elements 2, the position detecting means 19 By performing positioning control so that the detection signal becomes 0 V, the red R and blue B liquid crystal display elements 2 can be positioned. Therefore, the positioning control of the red R and blue B liquid crystal display elements 2 can be simplified, and the power consumption can be reduced.

  In the above description, the position detecting unit 19 is provided on the screen 18. However, as shown in the perspective view of FIG. 10, the corresponding pixels of the RGB liquid crystal display element 2 synthesized by the light synthesizing unit 4. The light may be condensed at one point in the vicinity of the screen 18 other than the screen 18, and the position detecting means 19 and the minute position adjusting means 23 may be provided near the condensing point. In this case, the reflective liquid crystal display element 2 is illustrated, but one detection can be performed with the configuration shown in FIG. 10 even if a transmissive liquid crystal display element is used.

  By providing the position detecting means 19 on the screen 18 or in the vicinity of the screen 18 in this way, the image reflected by each liquid crystal display element 2 and enlarged by the projection lens 17 is enlarged about 100 times, and therefore one pixel is about When the thickness is 10 μm, each side becomes a spot having a size of 1 mm on the screen 18. If one pixel is shifted by 5 μm, a spot having a size of 1 mm on the screen 18 is shifted by 0.5 mm. Since the positional deviation of the liquid crystal display element 2 is enlarged by about 100 times as described above, the position detection sensitivity of the liquid crystal display element 2 is set to the projection lens 17 when the position detection means 19 is arranged outside the projected video area 18a on the screen 18. By using the light transmitted through the liquid crystal, the sensitivity can be increased to about 100 times, the positioning control of the liquid crystal display element 2 can be performed with high accuracy, the pixel shift control accuracy is improved, and a higher definition image is obtained. Can be obtained. Further, the position of the liquid crystal display element 2 can be confirmed from the positions of the spot lights of the four-divided light receiving elements 19a to 19d.

  In each of the above explanations, the case where the position detecting means 19 is provided on the screen 18 or in the vicinity of the screen 18 has been described. However, as shown in the perspective view of FIG. 11, the reflected light from the liquid crystal display element 2 incident on the projection lens 17. An optical path deflecting unit 24 composed of a mirror, a prism, or a half mirror for deflecting a part of the light is provided, a position detecting unit 19 is provided on the side of the light combining unit 4 and the projection lens 17, and an optical path of a part of the light from the light combining unit 4 is provided. May be deflected and received by the position detecting means 19 to control the positioning of each liquid crystal display element 2. In this case, the position detection means 19 may be provided for each of the RGB liquid crystal display elements 2, or one set of position detection means 19 may be shared by the RGB liquid crystal display elements 2.

  When the position detection means 19 is provided on the screen 18 or in the vicinity of the screen 18, the position detection means 19 can be used only in the rear projector. However, by providing the position detection means 19 on the screen 18 or in a place other than the vicinity of the screen 18 in this way. In any liquid crystal display device such as a front projector or a rear projector, pixel shift can be prevented.

  Further, if a condensing lens is provided between the optical path deflecting unit 24 and the position detecting unit 19, the amount of light per unit area can be increased and the sensitivity of the position detecting unit 19 can be increased. Accuracy can be improved.

  In the above description, the case where the optical path deflecting means 24 for deflecting a part of the reflected light from the liquid crystal display element 2 incident on the projection lens 17 is provided, but as shown in the perspective view of FIG. The holding member 8 may be provided with the optical path deflecting unit 24, and the light source 25 may be provided near the optical path deflecting unit 24, and the position detecting unit 19 may be provided at a position where the light from the light source 25 is reflected by the optical path deflecting unit 24. With this configuration, when the liquid crystal display element 2 moves in the X direction or the Y direction, the position where the light from the light source 25 is reflected by the optical path deflecting means 24 changes, and the position of the light incident on the position detecting means 19 moves. Thus, the position of the liquid crystal display element 2 can be detected. Thus, by detecting the reflected light of the optical path deflecting means 24 provided on the liquid crystal display element holding member 8 by the position detecting means 19, a part of the reflected light from the liquid crystal display element 2 incident on the projection lens 17 is deflected. Even when the optical path deflecting unit 24 is not provided, the liquid crystal display element 2 can be positioned and controlled, and the layout of the optical path deflecting unit 24, the light source 25, and the position detecting unit 19 can be facilitated.

  In each of the above descriptions, the liquid crystal display element holding member 8 is connected to the support member 10 protruding from the upper part of the support case 9 of the liquid crystal display device 1. However, as shown in the perspective view of FIG. 8 is connected to an intermediate member 26 having a spherical seat through an elastic support member 11, and the support case 9 of the liquid crystal display device 1 is arranged so that the center of the spherical seat of the intermediate member 26 is near the pixel center of the liquid crystal display element 2. It is preferable to adjust the inclination of the liquid crystal display element 2 by attaching to the support member 10 protruding from the upper portion and adjusting the inclination of the intermediate member 26 with the inclination adjusting screws 27 provided at three positions of the support member 10. That is, when the liquid crystal display element 2 is tilted with respect to the screen 18, the focus is shifted vertically and horizontally, resulting in out of focus and a high-definition image cannot be obtained. Therefore, an intermediate member 26 having a spherical seat whose principal point is the center of the reflection surface of the liquid crystal display element 2 corresponding to the center position of the screen 18 is provided, and the tilt of the liquid crystal display element 2 is adjusted, thereby defocusing on the screen 18. Can be removed, and a high-definition image can be obtained.

It is a perspective view which shows the structure of the positioning drive device of the liquid crystal display device of this invention. It is a perspective view which shows the structure of the projection part of a liquid crystal display device. It is a block diagram of a positioning drive means. It is a block diagram of a 4-part dividing light receiving element. It is a block diagram which shows the structure of a position control part. It is a flowchart which shows the positioning operation | movement of a liquid crystal display element. It is a perspective view which shows the structure at the time of using a parallel spring as an elastic support member. It is a perspective view which shows the structure of the positioning drive device on the basis of any one position of a liquid crystal display element. FIG. 5 is a layout diagram showing position detecting means provided in a place other than an image forming area of a screen. It is an arrangement view of position detecting means provided in the vicinity of the screen. It is an arrangement view of position detecting means provided on the side of the projection unit. It is an arrangement view of position detecting means provided in the vicinity of the liquid crystal display element. It is a perspective view which shows the structure of the positioning drive device which hold | maintained the liquid crystal display element using the intermediate member which has a spherical seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Liquid crystal display device, 2; Liquid crystal display element, 3; Positioning drive means, 4; Photosynthesis means,
5; Wire grid, 6; Illumination light incident part, 7; Projection part,
8; Liquid crystal display element holding member, 9; Support case, 10; Support member,
11; elastic support member, 12; fine movement means, 13; magnet,
14; X direction drive coil, 15; Y direction drive coil, 16; Moving magnet,
17; projection lens, 18; screen, 19; position detecting means, 20; arithmetic processing unit,
21; drive controller, 22; position controller, 23; minute position adjusting means,
24; optical path deflecting means; 25; light source; 26; intermediate member.

Claims (14)

A holding member for holding a liquid crystal display element;
Positioning drive means comprising: an elastic support member for finely connecting the holding member to the support member; and fine movement means for moving the holding member by a minute distance;
Position detecting means for detecting the position of the liquid crystal display element;
A position control means for comparing the position of the liquid crystal display element detected by the position detection means with a preset reference value and controlling the fine movement means to position the liquid crystal display element. A fine-positioning driving device for a liquid crystal display element. In the fine movement positioning drive device of the liquid crystal display element according to claim 1,
A fine movement positioning driving device for a liquid crystal display element, wherein the fine movement means is formed of a moving magnet. In the fine-movement positioning drive device of the liquid crystal display element of Claim 1 or 2,
A fine positioning driving device for a liquid crystal display element, wherein the position detecting means is formed by a four-part light receiving element. In the fine movement positioning drive device of the liquid crystal display element according to any one of claims 1 to 3,
An intermediate member having a spherical seat is provided between a holding member for holding each of the liquid crystal display elements and the support member, and the principal point center of the intermediate member is disposed in the vicinity of the pixel center of the liquid crystal display element. A fine-positioning driving device for a liquid crystal display element.   5. An optical engine using a liquid crystal display element, comprising the fine movement positioning drive device for a liquid crystal display element according to claim 1. A liquid crystal display element that modulates each light beam of illumination light obtained by separating light from a light source into light beams of a plurality of colors, a light combining unit that combines the light beams modulated by the liquid crystal display element, and an image synthesized by the light combining unit In a liquid crystal display device having a projection unit for projecting light,
Holding members that respectively hold the liquid crystal display elements of the plurality of colors;
Positioning drive means comprising: an elastic support member for finely connecting the holding member to a support member of a support case of the liquid crystal display device; and fine movement means for moving the holding member by a minute distance;
Position detecting means for detecting the position of the liquid crystal display element;
A liquid crystal display having position control means for comparing the position of each liquid crystal display element detected by the position detection means with a reference value set in advance and driving the fine movement means to position the liquid crystal display elements; A liquid crystal display device comprising a device for finely positioning and driving an element. The liquid crystal display device according to claim 6.
A fixing member for fixing any one of the liquid crystal display elements of the plurality of colors after alignment adjustment; and the position control means uses the position of the liquid crystal display element fixed to the fixing member as a reference to another liquid crystal display element. A liquid crystal display device that controls the position of the liquid crystal display. The liquid crystal display device according to claim 6 or 7,
A liquid crystal display device, wherein the position detecting means is provided on a screen for each of the liquid crystal display elements of the plurality of colors. The liquid crystal display device according to claim 6 or 7,
2. A liquid crystal display device according to claim 1, wherein the position detecting means is provided in common with the liquid crystal display elements of the plurality of colors at a position other than the image display area of the screen. The liquid crystal display device according to claim 6 or 7,
2. A liquid crystal display device according to claim 1, wherein the position detecting means is provided in common with the liquid crystal display elements of the plurality of colors at a position near the screen. The liquid crystal display device according to claim 6 or 7,
Optical path deflecting means for deflecting part of the light from the light combining means;
A liquid crystal display device characterized in that the position detecting means is provided in an optical path deflected by the optical path changing means. The liquid crystal display device according to claim 6 or 7,
Optical path deflecting means for deflecting light provided on holding members for holding the liquid crystal display elements of the plurality of colors,
A light source for making light incident on the optical path deflecting means,
The liquid crystal display device, wherein the position detecting means receives reflected light from the optical path deflecting means. The liquid crystal display device according to claim 6,
A liquid crystal display device comprising fine position adjusting means for adjusting the position of the position detecting means. The liquid crystal display device according to claim 6,
An intermediate member having a spherical seat is provided between the holding member for holding the liquid crystal display elements of the plurality of colors and the support member, and the principal point center of the intermediate member is disposed in the vicinity of the pixel center of the liquid crystal display element. A liquid crystal display device characterized by the above.

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