JP2015161856A - video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video display device capable of securing an element formation area on a printed circuit board by reducing the number of fixed holes formed in the printed circuit board for fixing mask members.SOLUTION: In a case of fixing a plurality of mask members 31 and 32 to one printed circuit board 1, one fixed hole 4a formed in the printed circuit board 1 is used as a common hole for fixing the two adjacent mask members 31 and 32 to the printed circuit board 1. The fixed hole 4a is formed at a position on the printed circuit board 1 overlapping outer peripheral end portions of the two mask members 31 and 32 proximate to each other. A total of two snap fits 7aa and 7ab provided on the outer peripheral end portions of the two mask members 31 and 32, respectively are inserted into one common fixed hole 4a. Owing to this, it is possible to keep down the number of fixed holes without reducing the number of fixed points of the mask members 31 and 32.

Description

  The present invention relates to a video display device formed by arranging a large number of light emitting elements and the like.

A conventional video display device includes a printed circuit board provided with a drive circuit and the like, light emitting elements arranged in a matrix on the printed circuit board, and a mask member disposed in a non-light emitting area on the printed circuit board. And the structure by which the two mask members which cover a non-display area | region on the printed board of 1 sheet are mutually arrange | positioned is shown (for example, refer patent document 1).
It has been shown that a screw is used as a method of fixing the mask member to the printed circuit board (for example, see Patent Document 2).
Further, as a method for fixing the frame body to the substrate, a method is shown in which a snap-fit structure is integrally formed on the frame body, and is inserted into and fitted into a hole in the substrate (see, for example, Patent Document 3).

Japanese Patent No. 3914487 (FIG. 2, paragraphs 0021-0024) Japanese Patent Laid-Open No. 10-161568 (FIG. 1, paragraph 0019) JP 2002-231977 (FIG. 1, paragraph 0018)

The video display device becomes higher in definition as the pitch between the light emitting elements is smaller, and high image quality can be obtained. However, the smaller the pitch between the light emitting elements, the higher the required pattern wiring density and the higher density electronic component placement, and the higher the design difficulty of the printed circuit board.
In conventional video display devices, the number of fixing holes equal to or greater than the number of fixing points of the mask member must be formed in the printed circuit board, which reduces the pattern wiring area and component mounting area on the printed circuit board, making it difficult to design the printed circuit board. The degree was high.
When the display surface of a single printed circuit board is covered with multiple mask members, it is fixed on the printed circuit board so that the outer peripheral edges of the flat mask members are aligned and tiled. As the number of members increases, the number of fixing points on the mask member side increases, and the number of fixing holes for receiving fixing members formed on the printed circuit board also needs to be increased in accordance with the number of fixing points.

  It has been impossible to reduce the number of fixed points of the mask member in order to reduce the design difficulty of the printed circuit board because it causes a reduction in image quality. The reason for this is that resin is often used as the material for the mask member, and since the resin generally has a high coefficient of thermal expansion, the heat generated by other electronic components on the light-emitting element and the printed circuit board and the effects of solar heat. It receives and expands, causing warping and floating between fixed points of the mask member. The warping or floating of the mask member partially blocks the light emission of the light emitting element, causing unevenness in the brightness of the display panel and causing the image quality to deteriorate, so the fixed points could not be reduced. .

  The present invention has been made to solve the above-described problems, and reduces the number of fixing holes provided on the printed circuit board and reduces the image quality without reducing the number of fixing points provided on the mask member. An object of the present invention is to obtain a video display device capable of increasing the design margin of a printed circuit board without any problems.

  An image display apparatus according to the present invention includes a printed circuit board on which light emitting elements are arranged on a display surface, and first and second mask members arranged on the display surface of the printed circuit board and arranged adjacent to each other. The first mask member and the second mask member are fixed to a single fixing hole opened through the fixing member.

  According to the video display device of the present invention, since the fixing member for fixing the first and second mask members can be fixed to one common fixing hole, the printed circuit board without reducing the mask member fixing points. It is possible to increase the substrate design margin by reducing the number of fixing holes formed in the substrate.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the video display apparatus concerning Embodiment 1 of this invention, and is an exploded perspective view which shows a printed circuit board and a mask member. It is a back surface side perspective view of the mask member of Embodiment 1 of this invention. It is a block diagram of the video display apparatus shown as a comparative example, and is an exploded perspective view showing the arrangement of the fixing holes of the printed circuit board and the screw holes of the mask member. It is sectional drawing of the video display apparatus concerning Embodiment 1 of this invention, and is a figure corresponded in the AA cross section of FIG. 1 in the state which fixed the mask member to the printed circuit board using the screw | thread. It is sectional drawing of the video display apparatus shown as a comparative example, and is a figure corresponded in the BB cross section of FIG. 3 in the state which fixed the mask member with the screw | thread. It is the perspective view which looked at the mask member of Embodiment 2 of this invention from the back surface side. It is the back surface side perspective view of the conventional mask member shown as a comparative example, and is the figure which showed arrangement | positioning of a snap fit. It is sectional drawing of the video display apparatus which concerns on Embodiment 2 of this invention, and is a figure equivalent to the AA cross section of FIG. 1 in the state which fixed the mask member to the printed circuit board using the snap fit. It is sectional drawing of the video display apparatus shown as a comparative example, and is a figure corresponded in the BB cross section of FIG. 3 in the state which fixed the mask member by snap fit. It is a figure which shows the fixed hole opening shape (Dalma shape) of the printed circuit board concerning Embodiment 3 of this invention, and is a figure equivalent to CC cross section of FIG. It is a figure which shows the fixed hole opening shape (ellipse) of the printed circuit board shown as a comparative example. It is a principal part enlarged view of FIG. 10 which showed the movement of the snap fit in the fixing hole of the printed circuit board concerning Embodiment 3 of this invention. It is a figure which shows the fixed state of the mask member by the snap fit concerning Embodiment 4 of this invention, and is sectional drawing perpendicular | vertical to an insertion direction and sectional drawing along an insertion direction.

Embodiment 1 FIG.
Hereinafter, a video display apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a configuration of a video display device according to the present invention, which covers a printed circuit board 1 in which light emitting elements 2 (for example, LED elements) are arranged in a matrix on a display surface, and a non-light emitting area of the printed circuit board 1. It is a disassembled perspective view which shows the mask board 3 called a black matrix. The mask plate 3 includes a plurality of mask members 31 (first mask member) and 32 (second mask member) having the same shape. In the example of FIG. 1, an example in which four 2 × 2 mask members 31 and 32 are arranged as a mask plate 3 that covers one printed board 1 is shown. In the mask plate 3, the mask member 31 and the mask member 32 are arranged adjacent to each other. Although the mask member 31 and the mask member 32 are arranged in the horizontal direction in FIG. 1, this combination is also arranged in the vertical direction to constitute the mask plate 3. The vertical and horizontal directions on the paper surface may be reversed, and the mask plate 3 can be configured by various combinations of mask members. Further, the opening 30 formed in the mask members 31 and 32 is a portion into which the light emitting element is fitted when superimposed on the printed circuit board 1 and is configured not to prevent light emission.

  Fixing holes 4 a and 4 b for fixing the mask plate 3 (including mask members 31 and 32) are opened in the printed circuit board 1. The arrangement pitch of the light emitting elements 2 is, for example, about 4 mm to 20 mm. In the example of FIG. 1, an arrangement example of the light emitting elements 2 is 16 × 14, and the number of element rows in the region on the substrate covered by one mask member 31 (32 is the same) is 8 × 7. This element row shows an example, and other arrangement examples are possible.

  For example, a total of three fixing holes 4a and 4b formed in the printed board 1 are provided on a line indicated by a broken line in FIG. The fixing hole 4a formed in the central portion of the printed circuit board 1 is provided so as to overlap with a position where the outer peripheral end portions of the mask members 31 and 32 are adjacently disposed and abutted. The fixing hole 4a is a common hole into which a fixing member for fixing the mask members 31 and 32 is inserted. On the other hand, the fixing hole 4b is a hole opened at a position close to the outer peripheral portion of the printed circuit board 1 but not at the outer peripheral end portion, and the fixed hole 4b has one mask member 31 (or The fixing member 32) is inserted.

  Next, FIG. 2A shows a back side perspective view of the mask member 32 disposed at the end of the substrate. In the example of FIG. 1, since the mask members 31 and 32 in which the mask plate 3 is divided into 4 × 2 × 2 are used, all the mask members 31 and 32 are members disposed at the end portions of the printed circuit board 1. Become. The mask member 31 has a line-symmetric structure with respect to the mask member 32 of FIG. In the video display device according to the first embodiment, screws 5 a and 5 b (described later) are used as fixing members that fix the printed circuit board 1 and the mask plate 3. Therefore, as shown in FIG. 2A, the mask member 32 is formed with a screw hole 3b having a circular opening. What is characteristic is a notch 3a for screw fastening provided at an outer peripheral end of the mask member 32 adjacent to the mask member 31 (not shown). This semicircular cutout 3a is combined with another cutout 3a provided on the mask member 31 (not shown) to form a circular screw hole into which the common screw 5a is screwed. The screw hole 3b that fixes only the single mask member 31 or 32 and is not used in common has a circular opening shape as described above, and one screw 5b is inserted. Further, the screw hole 3 b is disposed on the outer peripheral portion that is not an end portion of the printed circuit board 1.

  As can be seen from FIGS. 1 and 2 (a), on the broken line in FIG. 1, the total number of screw holes 3b and notches 3a is 4, and the number of fixed points on the mask side is 4, whereas The total number of fixing holes 4a and 4b formed in the printed circuit board 1 is three, and the number of fixing points on the substrate side is three. In other words, by providing the notch 3a serving as a common screw hole, it is possible to reduce the numerical aperture of the fixing hole on the substrate side without reducing the number of fixing points on the mask side.

  Next, FIG. 2B is a rear perspective view of the mask member 33 inside the substrate with respect to the mask member 32 at the substrate end. This mask member 33 is a mask member located at the center of three arranged in one row when, for example, six 3 × 2 mask members are used to form the mask plate 3. As shown in FIG. 2B, a notch 3a for screw fastening is formed in the mask member 33 arranged inside the substrate and used as a common screw hole with the adjacent mask member. When configuring a large-sized video display device, by arranging a larger number of mask members 33, an element arrangement area on the substrate can be earned, and the design margin is improved.

  Here, as a comparative example, FIG. 3 shows a configuration diagram of a video display device in which a common fixing hole 4a for fixing the mask plate 300 for fixing the mask plate 300 to the printed board 10 is not provided. FIG. 3 is an exploded perspective view showing the arrangement of the fixing holes 4 b of the printed circuit board 10 and the screw holes of the mask member 320. As shown in FIG. 3, when the fixing hole 4b for fixing the single mask member 310 or 320 is formed in the printed circuit board 10, the opening shape of the screw hole 3b is as shown in the rear side perspective view of the mask member 320. It is circular. Therefore, a total of four fixing holes 4b are arranged on the broken line in FIG. 3 passing through the adjacent mask members 310 and 320. The number of fixing holes 4b on the printed circuit board 10 is the same as the number of screw holes 3b on the mask members 310 and 320, and the design margin of the printed circuit board 10 may be smaller than that of FIG. I understand.

Next, a reduction in the number of fixed holes on the printed circuit board 1 will be described by comparing the video display device according to the first embodiment of the present invention with a video display device having a conventional structure. 4 and 5 are cross-sectional views corresponding to the AA cross section of FIG. 1 and the BB cross section of FIG. 3, respectively, showing a state in which a screw is used as a fixing member and a mask member is fixed to a printed circuit board. is there. These figures show that the video display device of the present invention can reduce the number of fixed holes on the printed circuit board 1 side while securing the number of fixed points on the mask side as compared with the conventional video display device of the comparative example.
That is, as shown in FIG. 4, the fixing hole 4 a on the printed circuit board 1 is disposed across the mask members 31 and 32 adjacent to each other. Then, by inserting the screw 5a into the screw fastening notch 3a formed on each of the mask member 31 and the mask member 32, and tightening and fixing to the eyelet 6 attached to the fixing hole 4a of the printed circuit board 1. The two mask members 31 and 32 can be fixed to the common fixing hole 4a. Thereby, it is possible to replace the two fixing holes 4b for fastening the screws 5b of the printed circuit board 10 shown in FIG. 5 with one common fixing hole 4a, thereby reducing the number of fixing holes.

  Accordingly, if one common fixing hole 4a is increased, the pattern wiring area on the printed circuit board 1 can be increased by the same number in which two non-common fixing holes 4b are decreased. The degree of design lead time can be reduced. Further, since the area where the electronic parts can be arranged on the printed circuit board 1 is widened, the heat generating parts can be distributed and the temperature rise can be suppressed, and the life of the electronic parts can be extended. In addition, since the color of the light emitting element 2 has temperature characteristics, it is possible to reduce the change in color as the temperature rise is suppressed, and to obtain the effect of improving display image quality characteristics.

  As another effect, by combining the mask members 31, 32, 33 in a small size, it can be applied to different types of video display devices of different sizes. As a result, initial costs such as mold costs and initial design costs generated for each model can be suppressed.

Embodiment 2. FIG.
Next, a video display apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS. In the above-described first embodiment, the example in which the screws 5a and 5b are used as the fixing members when the mask plate 3 is fixed to the printed circuit board 1 is shown. However, in the second embodiment, the fixing members are replaced with screws. An example using a snap-fit structure will be described. As shown in FIG. 6, the snap fits 7 a and 7 b are formed integrally with the mask members 32 and 33 and protrude from the back surface side of the mask members 32 and 33 to the display surface side of the printed circuit board 1. It has a structure in which it is press-fitted into the fixing holes 4a, 4b on the printed circuit board 1 side using flexibility, and has a protruding protrusion at the tip.

FIG. 6A is a back side perspective view of the mask member 32 at the end of the substrate according to the second embodiment, and FIG. 6B is a back side perspective view of the mask member 33 inside the substrate. As shown in FIG. 6 (a), the mask member 32 is formed with a snap fit 7a of one claw that shares a fixing hole 4a on the printed board 1 side with a mask member 31 (not shown) at the outer peripheral end. The fixing hole 4a formed on the printed circuit board 1 side is the same as the arrangement shown in FIG. 1, and is formed at a position where the two mask members 31 and 32 overlap with the outer peripheral end portions close to each other. The snap fit 7b that fixes only a single mask member that is not used in common has a two-claw configuration. Then, this two-fitting snap fit 7b is inserted into one fixing hole 4b on the substrate side. Further, the snap fit 7 b is disposed on the outer peripheral portion that is not the end portion of the printed circuit board 1.
Further, as shown in FIG. 6B, the mask member 33 inside the substrate is formed with a snap fit 7a of one claw, and one snap fit 7a of the adjacent mask member 33 (or 31, 32) is formed. It is inserted into the fixing hole 4a on the substrate side.

FIG. 7 is a rear perspective view of a conventional mask member shown as a comparative example of the video display device of the second embodiment, showing an example showing the arrangement of the snap fits 7b of two claws. Conventionally, the snap fit 7 b is not formed on the outer peripheral end of the mask member 320.
FIG. 8 is a cross-sectional view of the video display device according to the second embodiment, in which one snap fit 7aa (first snap fit) and 7ab (second snap fit) formed on the mask members 31 and 32 is shown. ) Is inserted into one fixed hole 4a of the printed circuit board 1, and is a view corresponding to the AA cross section of FIG. In the cross-sectional view of FIG. 8, there are a total of three claws of the snap fits 7aa and 7b shown in the mask member 31, and similarly, the total number of claws of the snap fits 7ab and 7b on the mask member 32 side is the same. . The total number of fixing holes 4a and 4b in the printed circuit board 1 is three.

  On the other hand, FIG. 9 is a comparative example of FIG. 8 and shows an example in which the fixing hole 4b on the printed circuit board 10 is not shared for fixing the two mask members 310 and 320. It is sectional drawing which shows the state which the snap fit 7b of 2 nail | claws fitted and the mask members 310 and 320 were fixed, and is a figure equivalent to the BB cross section of FIG. In the cross-sectional view of FIG. 9, there are a total of four claws of the snap fit 7b provided at two positions of the mask member 310, and similarly, the total number of claws of the snap fit 7b on the mask member 320 side is the same. . The total number of fixing holes 4b in the printed circuit board 1 is four.

  Thus, by inserting the snap fit 7aa of the mask member 31 and the snap fit 7ab of the mask member 32 into one (common) fixing hole 4a on the printed board 1 side, the printed board 1 and the mask member 31, 32 can be fixed. As a result, the number of fixing holes 4b of the printed circuit board 1 shown in FIG. 9 can be reduced from two to one, and the same effect as that of the first embodiment of improving the design margin of the printed circuit board 1 can be obtained.

  In addition, in the video display device configured as in the second embodiment, since the outermost edge of the mask member 31 and the like is fixed by the snap fit 7a, an external force to be peeled acts on the edge of the mask member 31 and the like. In this case, the mask member 31 and the like are hardly deformed and are not easily detached from the printed circuit board 1, and the effect of suppressing damage to the mask member 31 and dropping off can be obtained.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a diagram showing a common fixing hole 40 opening shape into which two fixing members of the printed circuit board 1 according to Embodiment 3 of the present invention are inserted, and is a cross-sectional view taken along the line CC in FIG. FIG. 11 is a comparative example of the third embodiment, and shows a case where the opening shape of the fixing hole 400 of the printed circuit board 1 is an ellipse. Further, FIG. 12 shows an enlarged view of a main part of region E in FIG. 10, showing a state in which the snap fit 7aa is movable in the fixing hole 40 of the printed circuit board 1.

  In the third embodiment, the planar shape of the fixing hole 40 formed in the printed circuit board 1 is a dharma shape in which two circles are partially overlapped, and between the snap fits 7aa and 7ab inserted into the fixing hole 40. In FIG. 3, the constriction portion 41 is formed so that the opening size of the fixing hole 40 is reduced. Here, the snap fits 7aa and 7ab are formed so that the cross-sectional shape perpendicular to the insertion direction into the fixing hole 40 is a semicircular shape.

  As a comparative example, FIG. 11 shows a case where the opening shape of the fixing hole 400 of the printed circuit board 1 is an ellipse, but when the fixing hole 400 having a constricted portion 41 such as a dharma shape is used, This snap fit 7aa can move a distance until it comes into contact with the other snap fit 7ab inserted into the same fixing hole 400, which causes play.

According to the third embodiment of the present invention, the constricted portion 41 suppresses the movement of the snap fits 7aa and 7bb by the dharma-shaped fixing hole 40, and the mounting position accuracy of the mask member 31 and the like can be improved.
That is, as shown in FIG. 12, even if the snap fit 7aa moves to the right in the drawing, the corner portion indicated by the broken line of the snap fit 7aa interferes with the side wall of the fixing hole 40 (the surface of the constricted portion 41), and the movement is It is suppressed. Therefore, the movable range as a whole of the mask member 31 and the like can be made narrower than the comparative example of FIG.

  Thus, since the tolerance of the movement of the mask member 31 and the like in the left-right direction is reduced by forming the fixing hole 40 of the printed circuit board 1 in a dharma shape, the mounting position accuracy of the mask member 31 and the like to the printed circuit board 1 is reduced. Will improve. As a characteristic of the video display device, a black line appears at a portion where the interval between the mask members adjacent to each other is increased, and the image quality of the display screen is deteriorated. However, by using the Dalma-shaped fixing hole 40 in which the constricted portion 41 is formed, the attachment position of the mask member 31 and the like can be determined, and the distance between the mask members can be kept uniform. Is not conspicuous, and the display image quality can be improved.

Embodiment 4 FIG.
Next, a video display apparatus according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 13 is a view showing a fixed state of the mask member by snap fit according to Embodiment 4 of the present invention, and is a cross-sectional view perpendicular to the insertion direction (FIG. 13A) and a cross-sectional view along the insertion direction ( FIG.13 (b)) is shown, Fig.13 (a) is FF sectional drawing of FIG.13 (b). In the above-described third embodiment, the case where the same cross-sectional shape of the snap fits 7aa and 7ab is a semicircular shape has been shown. However, the snap fit 7c of the fourth embodiment has a substantially circular cross-sectional shape, and the snap fit 7c. Is formed in a cylindrical shape as a whole. When the shape of the fixing hole 40 formed in the printed circuit board 1 is a dharma shape, a cylindrical snap fit 7c as shown in FIG. 13 can be applied.

  In the semicircular snap fit 7aa of the above-described third embodiment, the repulsive force from the side wall of the dharma-shaped fixing hole 40 acts only in the left-right direction on the paper surface. However, as shown in the fourth embodiment, by using the cylindrical snap fit 7c, the repulsive force from the side wall of the fixing hole 40 is applied to almost the entire circumference of the cylindrical side surface of the snap fit 7c, that is, up, down, left and right on the paper surface. Acts diagonally. Therefore, the movable range of the mask member 31 and the like is narrowed not only in the left-right direction but also in the up-and-down oblique direction, the position of the snap fit 7c is restricted, and the mounting accuracy of the mask member 31 and the like is improved.

  Thereby, it is possible to keep the interval between the mask members uniform and improve the display image quality. Furthermore, since the snap fit 7c is fixed to the printed circuit board 1 with a force in the oblique direction of the upper, lower, left, and right sides by covering the wide area of the outer surface of the cylindrical snap fit 7c with the side wall of the fixing hole 40, the mask member 31 and the like. However, it is also possible to obtain an effect that it is difficult to drop off from the printed circuit board 1.

As described above, when the mask member 31 or the like is fixed to the printed circuit board 1 with the snap fit structure, the snap fit 7c is formed in a cylindrical shape having a circular cross section so that the cross section has a semicircular shape. Thus, the fastening of the substrate can be made stronger.
Further, in this fourth embodiment, the mounting accuracy is higher than in the third embodiment described above, the backlash between the cylindrical snap fit 7c and the fixed hole 40 of the dharma-shaped opening is suppressed, and a good fixed state Needless to say you can get

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

1, 10 Printed circuit board, 2 Light emitting element, 3, 300 Mask plate, 3a Notch,
3b Screw hole, 4a, 4b, 40, 400 Fixing hole, 5a, 5b Screw, 6 Eyelet,
7a, 7aa, 7ab, 7b, 7c Snap fit, 30 opening, 41 Constricted part, 31, 32, 33, 310, 320 Mask member.

Claims (8)

  A printed circuit board in which light emitting elements are arranged on a display surface, and first and second mask members arranged on the display surface of the printed circuit board and arranged adjacent to each other, and in one fixing hole opened in the printed circuit board An image display device, wherein the first and second mask members are fixed via a fixing member.   2. The video display device according to claim 1, wherein the fixing hole is formed at a position on the printed circuit board where the first mask member and the second mask member overlap with an outer peripheral end portion adjacent to each other. .   2. The fixing member of the first and second mask members is a screw, and the first and second mask members are fixed on the printed circuit board by fastening the screw. Or the video display apparatus of Claim 2.   The fixing members of the first and second mask members are first and second snap fits integrally formed with the first and second mask members, and the first and second snap fits The video display device according to claim 1 or 2, wherein the first and second mask members are fixed on the printed circuit board by being inserted into one of the fixing holes.   5. The video display according to claim 4, wherein a planar shape of the fixing hole has a constricted portion so that an opening size is reduced between the first and second snap fits inserted into the fixing hole. apparatus.   6. The video display device according to claim 4, wherein the planar shape of the fixing hole is a dharma shape.   7. The video display device according to claim 4, wherein the first and second snap fits have a semicircular cross-sectional shape perpendicular to an insertion direction into the fixing hole. .   The video display device according to any one of claims 4 to 6, wherein the first and second snap fits have a circular cross-sectional shape perpendicular to the insertion direction into the fixing hole.