JP5319732B2 - Photosensor unit and image display device. - Google Patents

Abstract

[Problem] To provide an optical sensor unit, which is configured such that a pressing force, with which the optical sensor unit is in contact with a display screen of an image display panel, is within a predetermined range, and that the optical sensor unit is applicable even to a positional change of the image display panel due to heat generated when the image display panel is driven. [Solution] An optical sensor unit (1) is configured such that: the optical sensor unit is provided with a substrate (2), which has an optical sensor mounted thereon, a light blocking frame (4) which prevents external light from entering the optical sensor, and a fixing member (3), which supports and fixes the substrate (2); the fixing member (3) has a plate spring (3) integrally formed therewith; and that the light blocking frame (4) is in contact with a display screen (101a) of the image display panel by being pressed by means of the plate spring (3), while being guided by means of a guide hole formed in the substrate (2).

Description

  The present invention relates to an optical sensor unit provided with an optical sensor used for measuring luminance, chromaticity, and the like of an image display panel, and an image display apparatus incorporating the optical sensor unit.

  Liquid crystal monitors for image display are used not only in offices and homes but also in various professional fields such as graphic design and medical care. In particular, the display of graphic design images and medical diagnostic images requires high-quality images with high reproducibility, so high-end class LCD monitors are used. A model that increases the reproducibility of displayed images by measuring optical characteristics such as screen brightness, chromaticity, and light quantity with an optical sensor and performing calibration based on the obtained measurement data is commercially available. Yes.

  The liquid crystal monitor includes a liquid crystal display panel, a bezel surrounding the liquid crystal display panel, a backlight, various electronic circuits, and the like. As a configuration for performing the calibration (calibration), for example, a light guide member for guiding light from the liquid crystal display panel to the optical sensor is externally attached across the bezel, and the light guided from the light guide member is bezel. A unit structure (Patent Document 1) for receiving light by an optical sensor arranged beside (externally attached) is known in the literature.

JP 2003-90780 A

  For monitors that display graphic design images, medical diagnostic images, etc., optical characteristics such as brightness and chromaticity of the display screen during calibration in order to meet the demand for highly reproducible and accurate image quality. Is required to be accurately measured by an optical sensor in a state that is not easily affected by ambient light. On the other hand, there is a high demand for functionality and design, such as the size and visibility of the displayed image, and the size of the bezel, such as the width and thickness, is limited by the shape of the optical sensor unit. There is a demand to avoid it.

  However, the structure described in Patent Document 1 is poor in appearance due to the locally increased thickness of the monitor because a horizontally long and convex light guide member is externally attached across the bezel. In addition, since light is reflected inside the light guide member and guided to the light sensor, there is a light transmission loss, and by arranging a light guide member having a larger light receiving surface than the light sensor, extraneous noise (external light) is reduced. The configuration is easily affected, and it is difficult to accurately measure optical characteristics such as luminance and chromaticity of the display screen.

  For this reason, as shown in FIGS. 18 to 21, a part of the surface facing the display screen 101a of the liquid crystal display panel inside the bezel 102 is partially recessed, and the optical sensor unit 194 is fixed thereto with screws 198. Thus, a structure in which the cushion member 199 of the optical sensor unit 194 is brought into contact with the display screen 101a of the liquid crystal display panel and the optical sensor 108 is disposed close to the display screen 101a of the liquid crystal display panel has been proposed and implemented. Here, FIG. 18 is a front view of an image display device (monitor) 190 provided with a conventional optical sensor unit 194, and FIG. 19 is a sectional view taken along line AA.

  Originally, since the liquid crystal display panel 101 is thin and delicate, it is easily deformed. Therefore, if the display screen 101a is pressed strongly, screen unevenness occurs, and brightness, chromaticity, and the like change. On the other hand, it is desired to prevent external noise (external light) from entering the space from the optical sensor 108 to the display screen 101a of the liquid crystal display panel. However, the positional relationship (how to make contact) between the liquid crystal display panel 101 and the optical sensor unit 194 has an initial dimensional variation obtained by adding an assembly variation to a component dimensional variation of the constituent members. Therefore, a structure is adopted in which a cushion member 199 is disposed on the surface of the optical sensor unit 194 that is in contact with the display screen 101a of the liquid crystal display panel (FIG. 19). The cushion member 199 covers the periphery of the optical sensor 108 and has a hollowed central portion so that the optical sensor 108 can receive light from the display screen 101a of the liquid crystal display panel.

  20 and 21 are cross-sectional views taken along the line BB showing the arrangement configuration of the conventional optical sensor unit 194 described above. FIG. 20 is a state diagram at the standard temperature, and FIG. 21 is a state diagram when heat is generated by operating the monitor 190 for a long time. According to the inventors' investigation, when the monitor 190 is operated for a long time, the liquid crystal display panel 101 generates heat, and as shown in FIG. ) And the left and right sides move rearward, and it has been found that the position of the liquid crystal display panel 101 and the optical sensor unit 194 varies depending on the temperature. That is, when the optical sensor unit 194 is disposed near the left end (or near the right end) of the upper end of the screen, a gap is generated between the display screen 101a of the liquid crystal display panel and the cushion member 199 due to the temperature variation, and the external Noise (external light) enters and it becomes difficult to accurately measure optical characteristics such as luminance and chromaticity of the liquid crystal display panel 101. For this reason, it has been considered that the optical sensor unit 194 is preferably arranged on the upper end side in the center of the screen where the gap due to heat generation of the liquid crystal display panel 101 is unlikely to occur (FIGS. 20 and 21). However, when the optical sensor unit 194 is arranged near the center of the upper end of the screen, the liquid crystal display panel 101 presses the cushion member 199 due to the temperature fluctuation, and therefore the cushion member 199 is relaxed to reduce the pressing force. The thickness must be increased. In addition, even if it is the upper end of the screen, by arranging the optical sensor unit 194 near the center, it becomes easy to enter the operator's field of view, and the degree of design freedom is also limited. Furthermore, even in such an arrangement, the light sensor unit 194 has a difficulty in maintaining the light shielding performance with the mounting structure of the light sensor unit 194.

  That is, as described above, the positional relationship (how to contact) the optical sensor unit 194 attached to the back surface of the bezel 102 (inside the bezel 102) and the display screen 101a of the liquid crystal display panel is due to variations in component dimensions of the constituent members. The temperature at which the gap between the display screen 101a of the liquid crystal display panel 101 and the cushion member 199 is generated or the gap is reduced due to the heat generation of the liquid crystal display panel 101 in addition to the initial dimensional variation in which assembly variation is added. However, if the position of the cushion member 199 is allowed to be allowed due to the cushioning property of the cushion member 199, the thickness of the cushion member 199 must be set larger.

  However, with the recent thinning of the image display device, the thickness of the bezel 102 has been reduced, and the distance from the inside of the bezel 102 to the liquid crystal display panel 101 has become very narrow, and the bezel 102 has been pushed into the inside. The cushion member 199 is easily crushed or distorted, and the cushion member 199 is crushed or distorted, thereby causing the screen screen 101a of the liquid crystal display panel to be strongly pressed and causing unevenness of the screen. Due to the fluctuation, a gap is generated between the liquid crystal display panel 101 and the optical sensor unit 194, and external noise (external light) enters to accurately measure the optical characteristics such as luminance and chromaticity of the liquid crystal display panel 101. Is getting harder. For this reason, it is not easy to prevent the gap between the cushion member 199 and the display screen 101a of the liquid crystal display panel while suppressing the pressing force on the display screen 101a of the liquid crystal display panel. Complicated adjustment work such as positioning the sensor unit 194 is required. Even if the gap is not generated in the initial state, the position change caused by the driving heat generation and the stop cooling of the liquid crystal display panel 101 is repeated, which makes it difficult to restore the cushion member 199 from the contracted state. A gap is formed, and the cushion member 199 is contracted and expanded too much to be noticed from the outside.

  Accordingly, an object of the present invention is to eliminate the gap between the optical sensor unit and the display screen of the image display panel while suppressing the pressing force on the display screen of the image display panel, and to adjust the optical properties such as brightness and chromaticity of the image display panel. An optical sensor unit having a configuration capable of accurately measuring characteristics and effectively suppressing the influence of position fluctuation due to drive heat generation of an image display panel, and an image display device incorporating the optical sensor unit It is to provide.

An optical sensor unit of the present invention includes an optical sensor used for measuring brightness, chromaticity, and the like of an image display panel, a light shielding frame that prevents external light from entering the optical sensor, and an elastic body that presses the light shielding frame. A guide member that guides the light shielding frame, the light shielding frame being slidably combined with the guide member, and the light shielding frame being pressed by the elastic body while being guided by the guide member. The light-shielding frame is configured to slide in contact with the display screen of the display panel and follow the displacement of the display surface due to heat generation of the image display panel.

  According to the present invention, the light shielding frame is pressed by the elastic body while being guided by the guide member, and is in contact with the display screen of the image display panel. In addition, since the light shielding frame is pressed by the elastic body while being guided by the guide member, it is possible to follow a positional variation due to driving heat generation of the image display panel. Examples of the guide member include a guide plate and a guide pin.

  The present invention is characterized in that the guide member is a substrate on which the optical sensor is arranged.

  According to the present invention, since the guide member is a substrate on which the optical sensor is arranged, it is easy to reduce the thickness while reducing the number of components.

  Examples of the image display panel include a liquid crystal display panel, an organic electroluminescence display panel, and a plasma display panel.

  Here, the elastic body refers to an elastic material used as a spring using its restoring force, and is made of metal, ceramics, plastic, elastomer, rubber, fluid, or the like. Examples of the spring include a leaf spring, a coil spring, a torsion spring, a spiral spring, a disc spring, a wire spring, a rubber spring, a fluid spring, and a resin spring.

  The present invention is characterized in that the elastic body is a leaf spring, a fixing member for supporting and fixing the guide member is provided, and the leaf spring is formed integrally with the fixing member.

  According to the present invention, by using the elastic body as a leaf spring, it is easy to obtain a stable pressing force while reducing its thickness. And since the said leaf | plate spring is integrally formed in the fixing member which supports and fixes the said guide member (the said board | substrate), the said fixing member can be easily manufactured by press work, sheet metal processing, etc. The number of points can be reduced and space can be saved.

  The fixing member is made of metal, ceramics, plastic, or the like. For example, by applying press processing or sheet metal processing to a metal plate made of stainless steel, aluminum, copper, brass, iron, or the like to make the fixing member, it is easy to effectively exert the restoring force of the leaf spring. In addition, it also has a function of protecting electronic components mounted on the substrate from static electricity by using a shielding effect for suppressing external noise (electrical noise).

  The guide member (the substrate) is attached and fixed inside a bezel disposed on the image display device by a double-sided tape, an adhesive, an adhesive, a screw or the like. Examples of the attachment position of the guide member (the substrate) include a frame portion of the image display panel and a back surface of the bezel.

  The present invention is characterized in that the fixing member is an L-shaped metal fitting and is attached to a frame portion of the image display panel.

  According to the present invention, since the fixing member is an L-shaped metal fitting, it is easy to attach the image display panel to the frame portion, and the interval between the photosensor and the display screen of the image display panel is increased. Easy to set to a predetermined value. The optical sensor unit may be attached to the image display panel at any location around the image display panel as long as it is a frame portion of the image display panel. For example, when the image display panel is horizontally long, the photo sensor unit is arranged near the upper right, and when the image display panel is vertically long, the photo sensor unit is arranged near the lower right, The optical sensor unit is relatively inconspicuous.

The position of the guide member (the substrate) is fixed, and the light shielding frame guided by the guide member (the substrate) follows the back-and-forth movement of the image display panel while contacting the image display panel.
More specifically, the structure in which the light shielding frame is guided by the guide member (the substrate) includes, for example, bosses such as pins, protrusions, and protrusions on one side and the other side. Examples include a structure in which a through hole (boss hole) through which the boss is slidably inserted, a guide hole such as a recess or a recess, or a notch is formed.

According to the present invention, the light shielding frame and the guide member are provided with a boss on one side, and a guide hole or a notch is formed on the other side so that the boss is slidably inserted. It is characterized by. Further, according to the present invention, the shading frame is provided with a boss, and the guide member is formed with a guide hole or notch, and the guide hole or notch is slidably inserted through the boss. It is preferable to let it be.

  According to the present invention, the light shielding frame guided by the guide member (the substrate) can easily follow the back-and-forth movement of the image display panel while being in contact with the image display panel. It is easy to increase the stroke for sliding the frame back and forth to follow the back-and-forth movement of the image display panel. The number of the guide holes or notches and the bosses may be one, or two or more. By arranging the bosses at a predetermined interval in the longitudinal direction of the light shielding frame, the movement of the light shielding frame in the lateral direction of the guide member (the substrate) is limited, so that the light shielding frame is less likely to sway.

  The light shielding frame is made of resin, metal, ceramics, or the like. For example, the light shielding frame having the boss can be formed integrally by molding the light shielding frame with a mold. The shading frame may be a single constituent member or a combination of two or more constituent members.

  According to the present invention, the light shielding frame includes a display screen side member and an elastic body side member that are divided into the display screen side and the elastic body side with the guide member interposed therebetween, and the boss is provided on the display screen side member. In addition, a boss hole for inserting the boss is formed in the elastic body side member.

  According to the present invention, since the guide member (the substrate) is sandwiched between the display screen side member and the elastic body side member of the light shielding frame, the light shielding frame is detached from the guide member (the substrate). There is no fear of doing it. The elastic body side member and the display screen side member are fixed together by fitting, bonding with an adhesive, screwing, or the like. For example, a metal plate made of stainless steel, aluminum, copper, brass, iron or the like is subjected to press processing or sheet metal processing to form the elastic body side member, and at the same time, a boss hole corresponding to a boss provided on the display screen side member is formed. By forming it on the elastic body side member, it becomes easy to reduce the thickness of the entire optical sensor unit, and it is mounted on the substrate using a shielding effect that suppresses external noise (electrical noise). The optical sensor also has a function of protecting the optical sensor from static electricity, and further, the boss of the display screen side member that is slidably inserted into the guide hole of the guide member (the substrate) is passed through the boss hole of the elastic body side member. Accordingly, the guide frame (substrate) can be moved in the lateral direction while the light shielding frame is slidable within a predetermined range in the thickness direction of the guide member (substrate). The shielding frame is hardly shake horizontal since the restricting.

  In the present invention, a cushion member is disposed on the side where the light shielding frame faces the display screen so that light from the display screen is received by the optical sensor while surrounding the optical sensor. The elastic member is pressed against the display screen and pressed against the elastic body.

  According to the present invention, the cushion member provided in the light-shielding frame comes into close contact with the display screen of the image display panel, and the image faces the optical sensor while covering the periphery of the optical sensor and preventing intrusion of external light. Only light from the display panel is received.

  The cushion member is made of rubber, elastomer, or the like, and more specifically, for example, polyethylene sponge or urethane sponge, and has closed cells from the viewpoint of softening the contact with the image display panel while improving light shielding performance. A sponge is preferred. The cushion member is disposed on the light shielding frame with a double-sided tape, an adhesive, an adhesive, or the like. The cushion member is not limited to one formed by hollowing out the central portion, and may be one in which a plurality of block sponges are bonded together.

  In order to prevent the intrusion of external light into the optical sensor more reliably, the light receiving portion of the optical sensor is used with an IR filter provided beforehand so as not to transmit infrared (IR), It is preferable that the IR filter plate is disposed in the window portion formed in the cushion member, or a combination of both may be employed.

  Since these optical sensor units of the present invention can be easily reduced in thickness, the size of the bezel, such as the width and thickness, is not easily restricted by the shape of the optical sensor unit, and no major design changes are required. It becomes easy to incorporate the optical sensor unit in an existing image display device.

  According to the present invention, the light shielding frame is pressed by the elastic body while being guided by the guide member (the substrate), and is in contact with the display screen of the image display panel. Is within the predetermined range, and the light shielding frame is pressed by the elastic body while being guided by the guide member (the substrate), thereby being able to follow the positional fluctuation due to the drive heat generation of the image display panel. Then, the cushion member provided in the light shielding frame comes into close contact with the display screen of the image display panel, and covers the periphery of the optical sensor from the image display panel facing the optical sensor while preventing the entry of external light. Only light is received.

  According to the present invention, since the elastic body is a leaf spring, it is easy to obtain a stable pressing force while reducing its thickness. And since the said fixing member and the said leaf | plate spring are integrally formed, the said fixing member can be easily manufactured by press work, sheet metal processing, etc., reduction of a number of parts and space saving are achieved. . Further, since the fixing member is an L-shaped metal fitting, it is easy to attach the frame to the image display panel, and the interval between the optical sensor and the display screen of the image display panel is set to a predetermined value. Easy to do.

  According to the present invention, the light shielding frame guided by the guide member (the substrate) is caused to follow the back-and-forth movement of the image display panel due to the drive heat generation of the image display panel while abutting the image display panel, and the stroke It is easy to increase the size. Further, since the movement of the light shielding frame in the lateral direction of the guide member (the substrate) is limited, the light shielding frame is less likely to shake. Furthermore, there is no possibility that the light-shielding frame falls off from the guide member (the substrate).

  According to these aspects of the present invention, while suppressing the pressing force on the display screen of the image display panel, the gap between the optical sensor unit and the display screen of the image display panel is eliminated, and the optical characteristics such as brightness and chromaticity of the image display panel are obtained. Can be accurately measured, and an optical sensor unit having a configuration that can effectively suppress the influence of position fluctuation due to driving heat generation of the image display panel can be obtained. Further, the size of the bezel, such as the width and thickness, is hardly restricted by the shape of the photosensor unit, and the image display device incorporating the photosensor unit is obtained without any major design change.

It is a front view which illustrates the image display device in which the optical sensor unit of the present invention is built. It is a front view which shows the attachment state of the optical sensor unit of the 1st description embodiment of this invention. It is AA sectional view taken on the line which shows the attachment state of the optical sensor unit of the said embodiment. It is BB sectional drawing which shows the attachment state of the optical sensor unit of the said embodiment. It is a front view of the photosensor unit of the embodiment. It is AA sectional view taken on the line of the optical sensor unit of the said embodiment. It is BB sectional drawing of the optical sensor unit of the said embodiment. It is a rear view of the optical sensor unit of the embodiment. It is a side view of the optical sensor unit of the said embodiment. It is a principal part disassembled perspective view of the optical sensor unit of the said embodiment. It is a figure which illustrates the display screen side member which comprises the light-shielding frame of the optical sensor unit of the said embodiment, (a) is a front view, (b) is a side view, (c) is a rear view. (D) is an AA line sectional view. It is a figure which illustrates the elastic body side member which constitutes the shade frame of the photosensor unit of the above-mentioned embodiment, (a) is a front view, (b) is a side view, (c) is a back view, (D) is an AA sectional view. It is a front view which shows the optical sensor unit of the 2nd description embodiment of this invention. It is a side view of the optical sensor unit of the said embodiment. It is BB sectional drawing of the optical sensor unit of the said embodiment. It is a figure which illustrates the light-shielding frame of the optical sensor unit of the said embodiment, (a) is a front view, (b) is AA sectional view, (c) is a rear view. It is a rear view which illustrates the board | substrate of the optical sensor unit of the said embodiment, (a) is a structural example with which the board | substrate and the guide member are integrated, (b) is a board | substrate and a guide member separate. This is a configuration example. It is a front view which illustrates the arrangement configuration of the conventional optical sensor unit in an image display apparatus. It is AA sectional view taken on the line which shows the arrangement configuration of the said conventional optical sensor unit. It is BB sectional drawing which shows the arrangement configuration of the said conventional optical sensor unit, and is a state figure at the time of standard temperature. It is a BB line sectional view showing the arrangement composition of the above-mentioned conventional photosensor unit, and is a state figure when it generates heat.

  Hereinafter, specific embodiments for carrying out the present invention will be described with reference to the drawings.

(Embodiment of the present invention)
FIG. 1 is a front view illustrating an image display device in which an optical sensor unit according to an embodiment to which the invention is applied is incorporated. The optical sensor unit 1 according to the present embodiment is slightly seen from the square frame bezel (frame) 102 of the liquid crystal display device 100 toward the liquid crystal display screen 101a. Here, when the liquid crystal display panel 101 is horizontally long, the optical sensor unit 1 is disposed so as to be near the upper right, and when the liquid crystal display panel 101 is vertically long, the optical sensor unit 1 is disposed so as to be near the lower right. The optical sensor unit 1 is in a relatively inconspicuous position. In the liquid crystal display device 100 of this embodiment, in order to improve the reproducibility of a display image, for example, the optical sensor unit 1 includes measurement of optical characteristics such as luminance, chromaticity, and light amount of the liquid crystal display panel 101 every predetermined time. The optical sensor performs calibration based on the obtained measurement data. In the example shown in FIG. 1, the liquid crystal display panel 101 is horizontally long and the optical sensor unit 1 is arranged near the upper right. However, the present invention is not limited to this, and the mounting position of the optical sensor unit 1 is a liquid crystal display. Any portion around the liquid crystal display panel 101 may be used as long as the frame portion 101c of the panel.

(First embodiment)
FIG. 2 is a front view showing a mounted state of the optical sensor unit according to the first embodiment of the present invention, and is an enlarged view showing a region surrounded by a dotted line (reference numeral C) in FIG. A sectional view taken along line AA in FIG. 2 is shown in FIG. 3, and a sectional view taken along line BB in FIG. 2 is shown in FIG.
The optical sensor unit 1 of this embodiment includes a substrate 2 on which an optical sensor 108 used for measuring the luminance, chromaticity, etc. of the liquid crystal display panel 101 is mounted, and a light shielding frame that prevents external light from entering the optical sensor 108. 4 and plate springs 31 and 31 that push the light shielding frame 4 (FIG. 2), and the substrate 2 is supported and fixed by a plate-like fixing member 3 having an L shape in a side view (FIG. 3). Metal plate springs 31, 31 are formed integrally with the fixing member 3 by pressing.

  Double-sided tapes 120, 120 are attached to the back side of the substrate 2 at a predetermined interval (see FIG. 8), and the metal fitting 34 at the upper end of the fixing member 3 is placed on the liquid crystal display panel 101. The double-sided tape 120, 120 on the substrate 2 is attached to the frame portion 101c (FIG. 3). According to this embodiment, the board | substrate 2 can be attached in an exact position and it is easy to set the space | interval of the optical sensor 108 and the display screen 101a of an image display panel to a predetermined value. Then, a cable 51 is connected to a control board (not shown) of the main body of the liquid crystal display device 100 via a connector 51 disposed on the front side of the board 2, and when the software built in the personal computer is started, the brightness of the liquid crystal display panel 101 is The optical sensor 108 provided in the optical sensor unit 1 measures optical characteristics such as chromaticity and light quantity, and calibration is performed based on the obtained measurement data.

  FIG. 5 is a front view showing the photosensor unit of the first embodiment. A sectional view taken along line AA in FIG. 5 is shown in FIG. 6, and a sectional view taken along line BB in FIG. 5 is shown in FIG. FIG. 8 is a rear view showing the photosensor unit of the first embodiment. FIG. 9 is a side view showing the photosensor unit of the first embodiment. The optical sensor unit 1 of the present embodiment includes a substrate 2 having a convex shape (downward convex shape in FIG. 5) when viewed from the front, and a fixing member 3 formed by pressing a metal plate such as stainless steel, aluminum, or iron. The substrate 2 is positioned and supported and fixed by the locking claws 39, 39 formed by processing and the sandwiching plates 38, 339, 339 (FIGS. 5 and 8). Then, slits 319 and 319 are formed at predetermined intervals with the connector 51 interposed therebetween, and the leaf springs 31 and 31 are formed integrally with the fixing member 3. And the front end side of the leaf | plate springs 31 and 31 is bent by the triangle shape by the side view so that it may protrude toward the board | substrate 2, respectively.

  In the first embodiment, the light shielding frame 4 includes a display screen side member 41 and an elastic body side member 42 that are divided into the display screen 101a side and the leaf spring 31 side (elastic body side) of the image display panel with the substrate 2 interposed therebetween. It is configured by combining (FIG. 3). FIG. 10 is an exploded perspective view of a main part of the optical sensor unit of the present embodiment. FIG. 11 is a diagram illustrating a display screen side member constituting the light shielding frame of the photosensor unit of the present embodiment, FIG. 11 (a) is a front view, and FIG. 11 (b) is a side view. FIG.11 (c) is a rear view, FIG.11 (d) is an AA sectional view. FIG. 12 is a diagram illustrating an elastic body side member constituting the light shielding frame of the optical sensor unit of the present embodiment, FIG. 12 (a) is a front view, FIG. 12 (b) is a side view, 12 (c) is a rear view, and FIG. 12 (d) is a cross-sectional view taken along line AA.

  In the present embodiment, the light shielding frame 4 has a rectangular box shape, and the wedge-shaped protrusions 419 and 419 formed on both sides in the longitudinal direction of the display screen side member 41 are arranged in the longitudinal direction of the elastic body side member 42. It has a structure in which it is engaged with and fitted in window holes 429 and 429 formed on both sides (FIG. 9). Here, the display screen side member 41 is a resin molded product, and the elastic body side member 42 is a metal press processed product.

  A rectangular window hole 418 is formed in the center of the display screen side member 41 so that the optical sensor 108 receives light from the liquid crystal display panel 101. On both sides of the window hole 418 in the longitudinal direction, A total of four bosses 415, 415, 416, 416 are formed at predetermined intervals (FIG. 11). In the example shown in FIG. 11, first bosses 415 and 415 are formed at predetermined intervals on the longitudinal center line of the window hole 418, and the edge of the window hole 418 far from the side wall of the display screen side member 41 is formed. On the line, second bosses 416 and 416 are formed at predetermined intervals. The first boss 415 protrudes from the side wall of the display screen side member 41 and the height of the second boss 416 is lower than the side wall of the display screen side member 41 in a side view. . The first boss 415 is slidably inserted into a first guide hole 25 formed in the substrate 2, and is inserted into a boss hole 425 formed at a predetermined interval in the longitudinal direction of the elastic body side member 42. The second boss 416 is slidably inserted into the second guide hole 26 formed in the substrate 2 (FIGS. 3, 6, and 10). These guide holes 25 and 26 are formed by machining the substrate 2 at the same time as the outer peripheral processing of the substrate 2 by performing machining such as drilling or die cutting or pressing.

  Here, FIG. 17A is a rear view illustrating the substrate 2 according to this embodiment, and is a configuration example in which the substrate 2 serves as a guide member. FIG. 17B is another example of the substrate 2, in which the rectangular substrate 2 is attached to the center of the downward convex guide member 28, and the substrate 2 and the guide member 28 are combined. It is a structural example. In the example of FIG. 17B, a metal plate or a resin plate that can be easily machined such as drilling or die cutting is used as the guide member 28, and the substrate 2 is fixed with an adhesive or a screw.

  In the present embodiment, as shown in FIG. 17A, the substrate 2 serves as a guide member that guides the light shielding frame 4. According to the present embodiment, the bosses 415, 415, 416, 416 are slidably guided by the guide holes 25, 25, 26, 26 formed in the substrate 2, and the light shielding frame 4 is predetermined by the leaf spring 31. The light-shielding frame 4 is made to follow the back-and-forth movement of the liquid crystal display panel 101 due to driving heat generation while being in contact with the image display screen 101a of the liquid crystal display panel. In addition, it is easy to slide the shading frame 4 back and forth to increase the stroke to follow the back-and-forth movement of the liquid crystal display panel 101 (see FIGS. 3 and 6). Here, since the fixing member 3 is grounded and the elastic body side member 42 of the light-shielding frame 4 that is in contact with the leaf spring 31 is grounded, a shielding effect that suppresses external noise (electrical noise). And also has a function of protecting electronic components such as the optical sensor 108 mounted on the substrate 2 from static electricity. In the present embodiment, the bosses 415 (416) are arranged at predetermined intervals in the longitudinal direction of the elastic body side member 42 of the light shielding frame 4, thereby restricting the movement of the light shielding frame 4 in the lateral direction of the substrate 2. As a result, the shading frame 4 is less likely to swing sideways. The guide hole 25 (26) is not limited to a circular hole, and may be an elliptical or square hole, and a notch may be formed on the end face side of the substrate 2. And the combination of the said guide hole 25 (26) and the boss | hub 415 (416) is not limited to four, One may be sufficient and two or more may be sufficient.

  In the present embodiment, an infrared (Infrared: IR) filter is provided in advance in the light receiving portion of the optical sensor 108 in order to prevent intrusion of outside light into the optical sensor 108. A rectangular light receiving hole 418 for receiving light is formed on the surface of the display screen side member 41 on the display screen 101a side, and a step 417 that is slightly larger than that is formed in the IR filter plate. 8 is fitted to prevent the intrusion of external light into the optical sensor 108 more reliably (see FIG. 10). Note that the IR filter plate 8 may simply be a transparent glass plate, an acrylic plate, a polyethylene sheet, or the like so that dust does not enter the optical sensor 108.

  In the present embodiment, the cushion member 9 is attached and fixed to the display screen side member 41 from above the IR filter plate 8 on the surface of the display screen side member 41 on the display screen 101a side with a double-sided tape or an adhesive. (FIG. 11). Here, the cushion member 9 has a rectangular shape corresponding to the surface of the display screen side member 41 on the display screen 101 a side, and light from the display screen 101 a is received by the optical sensor 108 while surrounding the optical sensor 108. Thus, a window 98 whose center is hollowed out is formed. The cushion member 9 is made of rubber, elastomer, or the like, and more specifically, for example, polyethylene sponge or urethane sponge. From the viewpoint of softening the contact with the liquid crystal display panel 101 while improving the light shielding performance, the cushion member 9 has closed cells. Have a sponge.

  According to the present embodiment, the light shielding frame 4 is stably pressed against the liquid crystal display panel 101 by the leaf spring 31 with a predetermined pressing force, so that the cushion member 9 is on the image display surface 101a of the liquid crystal display panel. (FIG. 3), and only the light from the liquid crystal display panel 101 facing the optical sensor 108 is received while covering the periphery of the optical sensor 108 and preventing the entry of external light. Note that the cushion member 9 is not limited to the one formed by hollowing out the central portion, and may be one in which a plurality of block-like sponges are bonded together.

(Second Embodiment)
FIG. 13: is a front view which shows the optical sensor unit of the 2nd Embodiment of this invention, The side view is shown in FIG. 14, The BB sectional view is shown in FIG. FIG. 16 is a diagram illustrating a light shielding frame of the optical sensor unit of the present embodiment, FIG. 16 (a) is a front view, and FIG. 16 (b) is a cross-sectional view along the line AA. 16 (c) is a rear view. Here, the same reference numerals represent the same functions, and description thereof will be omitted as appropriate.

  In the second embodiment, the light-shielding frame 4 is constituted by an elastic body side member 41, and a rectangular shape formed on the substrate 2 at the center of the rectangular box-shaped elastic body member 41 attached to the substrate 2. An arm-shaped boss 417 that is inserted into the guide hole 27 is disposed, and a protrusion that is slidably inserted into the guide hole 27 of the substrate 2 is formed on the distal end side of the arm-shaped boss 417 ( 13 to 16). The plate springs 31, 31 formed on the fixing member 3 are configured to push the surfaces on both sides of the elastic body member 41 toward the liquid crystal display panel 101.

  As described above, the present invention is not limited to the embodiment described above. For example, the elastic body 31 is applicable as long as it is used as a spring using its restoring force, and is not limited to a leaf spring, but is a coil spring, a torsion spring, a spiral spring, a disc spring, A wire spring, a rubber spring, a fluid spring, a resin spring, or the like may be used. These elastic bodies 31 may be formed integrally with the fixing member 3 or may be separate components that can be separated. The optical sensor unit 1 of the present invention may be incorporated when assembling the image display device, or may be externally attached after the image display device is assembled. The present invention can be applied to various image display devices such as liquid crystal, organic EL, and plasma. Thus, it goes without saying that the present invention can be modified as appropriate without departing from the spirit of the present invention.

1 optical sensor unit,
2 guide member (substrate),
3 fixing member (L-shaped metal fitting),
31 Elastic body (leaf spring),
4 Shading frame,
41 Display screen side members,
42 elastic body side members,
9 Cushion member,
100 image display device (liquid crystal display device),
101 Image display panel (liquid crystal display panel),
102 Bezel,
108 Optical sensor

Claims (9)

An optical sensor used for measuring the brightness, chromaticity, etc. of the image display panel, a light shielding frame that prevents external light from entering the optical sensor, an elastic body that presses the light shielding frame, and a guide that guides the light shielding frame The light shielding frame is slidably combined with the guide member, and the light shielding frame is pressed by the elastic body while being guided by the guide member, and comes into contact with the display screen of the image display panel. In addition, the optical sensor unit is configured such that the light-shielding frame slides following the displacement of the display surface due to heat generation of the image display panel.   The shading frame and the guide member are provided with a boss on one side, and a guide hole or a notch is formed on the other side so that the boss is slidably inserted. The optical sensor unit according to claim 1.   The shading frame has a boss, and the guide member has a guide hole or notch, and the guide hole or notch allows the boss to be slidably inserted. The optical sensor unit according to claim 1 or 2.   The light shielding frame includes a display screen side member and an elastic body side member that are divided into the display screen side and the elastic body side with the guide member interposed therebetween, and the boss is provided in the display screen side member. The optical sensor unit according to claim 3, wherein a boss hole through which the boss is inserted is formed in the elastic body side member.   The optical sensor unit according to claim 1, wherein the guide member is a substrate on which the optical sensor is arranged.   A cushion member is arranged on the side where the light shielding frame faces the display screen so that light from the display screen is received by the optical sensor while surrounding the optical sensor, and the cushion member is attached to the elastic body. The optical sensor unit according to claim 1, wherein the optical sensor unit is pressed and comes into close contact with the display screen.   The elastic body is a leaf spring, and a fixing member for supporting and fixing the guide member is provided, and the leaf spring is formed integrally with the fixing member. The optical sensor unit according to claim 1.   The optical sensor unit according to claim 7, wherein the fixing member is an L-shaped metal fitting and is attached to a frame portion of the image display panel.   An image display device incorporating the optical sensor unit according to claim 1.

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