JP2011023203A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of preventing deterioration of optical characteristics without preparing a resist section on a substrate and assembling at short time. <P>SOLUTION: A head of a substrate fixing rivet 30 has a diameter larger than a through-hole 11c, one surface of the substrate 8 is exposed from the through-hole 11c since the head closes the through-hole 11c between a reflection sheet 11 and the substrate 8, and deterioration of the optical characteristics can be prevented without preparing the resist section at a location of the substrate 8 corresponding to the through-hole 11c. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device that displays an image.

  Liquid crystal display devices that occupy a small indoor area compared to the size of the display screen are widely used because they can effectively use a limited indoor space. The liquid crystal display device is configured to display an image by irradiating light from a light source housed in the rear cabinet to a liquid crystal display panel that displays an image arranged inside the front cabinet. Conventionally, a cold cathode fluorescent tube has been used as a light source. However, since it is possible to easily perform partial control of the brightness of the screen and high-speed blinking control to suppress so-called moving image blurring, in recent years, LED (Light Emitting Diode) is often used.

  Patent Document 1 discloses a display device in which a support plate is disposed in a rear cabinet and a substrate on which LEDs are mounted is fixed to the support plate. A reflective sheet that reflects light is disposed on one surface of the substrate, and the LEDs are inserted into holes formed in the reflective sheet. In general, the substrate is fixed to a support plate using screws or the like, and a through hole having a diameter larger than that of the screw head is provided at a position corresponding to the screw of the reflection sheet. The head of the screw is inserted through the through hole to prevent the reflection sheet from being deformed.

JP 2007-80798 A

  Since the through hole provided in the reflection sheet has a larger diameter than the head of the screw, the substrate is exposed from the through hole. Therefore, a resist portion having the same color (for example, white) as that of the reflective sheet is provided at the position of the substrate corresponding to the through hole to prevent the optical characteristics of the display device from being deteriorated. However, since the work of providing the resist portion at the position of the substrate corresponding to the through hole is a fine work, there is a problem that it takes a long time and the display device cannot be efficiently assembled.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a display device that can prevent deterioration of optical characteristics and can be assembled in a short time without providing a resist portion on a substrate.

  A display device according to the present invention is provided on a substrate on which a light emitting element for irradiating light to the display panel is mounted, a support plate that supports the other surface of the substrate, and the substrate and the support plate, respectively. A plurality of insertion holes corresponding to positions, a head and a shaft protruding from the head; the shaft is inserted into each insertion hole from the one surface side; and the head is positioned on the one surface side. A fixing member that fixes the substrate to the support plate; and a reflection sheet that is disposed on the one surface and reflects the light of the light emitting element, and has a through-hole in the reflection sheet at a position corresponding to the head. In the display device having the above-described configuration, the head has a larger diameter than the through hole and is located between the through hole and the substrate.

  In the present invention, since the head portion of the fixing member closes the through hole, one surface of the substrate is not exposed from the through hole, and there is no need to provide a resist portion at the position of the substrate corresponding to the through hole.

  The display device according to the present invention is characterized in that the surface of the head has a curved surface.

  In the present invention, when the reflection sheet expands and contracts due to thermal change, the edge portion of the through hole moves smoothly on the surface of the head.

  The display device according to the present invention is characterized in that the edge portion of the head is positioned closer to the substrate than the center portion, and the edge portion of the through hole is positioned in the edge portion of the head.

  In the present invention, since the edge portion of the through hole is located at the edge portion of the head located on the substrate side, the reflective sheet is close to the substrate.

  The display device according to the present invention has an annular shape and is disposed along a circumferential direction of the latching portion, a latching portion with which an outer peripheral portion latches on an edge portion of the insertion hole provided in the substrate, A plurality of elastic portions protruding in an axial direction from an inner peripheral portion of the latching portion; and an abutting portion extending radially inward from the end portion of the protruding elastic portion; It is inserted in the said latching part, and is made to contact | abut to the said contact part.

  In the present invention, the elastic portion is curved outward in the radial direction of the annular hooking portion by inserting the shaft portion into the hooking portion and bringing it into contact with the abutting portion. A board | substrate and a support plate are clamped between parts, and a board | substrate is fixed to a support plate in a short time.

  In the display device according to the present invention, the shaft portion is a male screw, a female screw is formed on an inner periphery of an insertion hole provided in the support plate, and the shaft portion is screwed to the female screw. And

  In the present invention, the substrate can be firmly fixed to the support plate by screwing the shaft portion into the insertion hole provided in the support plate.

  In the display device according to the present invention, the light emitting element is an LED.

  In the present invention, an LED is used as a light emitting element, and power consumption and heat generation are suppressed without reducing the luminance of the display panel.

  In the display device according to the present invention, since the through hole is blocked by the head of the fixing member to prevent the substrate from being exposed from the through hole, the resist portion is provided at the position of the substrate corresponding to the through hole. Therefore, the optical characteristics are prevented from being deteriorated. Further, the time for providing the resist portion on the substrate is reduced, and the display device can be assembled in a short time.

1 is a longitudinal sectional view schematically showing a display device according to a first embodiment. It is a front view which briefly shows LED and the board | substrate which provided the reflective sheet. FIG. 3 is a cross-sectional view schematically showing a sheet holding rivet taken along line III-III in FIG. 2. FIG. 4 is a cross-sectional view schematically showing a substrate fixing rivet along line IV-IV in FIG. 2. FIG. 6 is a cross-sectional view schematically showing a substrate fixing screw of a display device according to a second embodiment.

(Embodiment 1)
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating a display device according to a first embodiment. FIG. 1 is a longitudinal sectional view schematically showing a display device.

  In the figure, reference numeral 1 denotes a rectangular display panel having a liquid crystal, and the display panel 1 is configured to display an image by adjusting a light transmittance by controlling a voltage applied to the liquid crystal. The display panel 1 is sandwiched between a front holding frame body 2 and a rear holding frame body 3, and is accommodated in a rectangular frame-shaped front cabinet 4. The front cabinet 4 is disposed around the front holding frame 2 and the rear holding frame 3. The front cabinet 4 has a rectangular opening, and the dimension of the opening corresponds to the display panel 1. On the rear side of the display panel 1, there are provided a plurality of optical sheets 5 that condense light of LEDs 9 (light emitting elements) described later toward the display panel 1.

  A diffusing plate 6 for uniformly diffusing the light of the LED 9 is provided on the rear side of the optical sheet 5. The diffusion plate 6 is supported by the edge portion of the deep dish-shaped support plate 7. A plurality of substrates 8 are arranged in parallel on the front surface of the support plate 7, and a film-like heat radiation pattern (not shown) made of a heat conductive material such as metal is formed on the rear surface of the substrate 8. .

  A plurality of LEDs 9, 9,... 9 are mounted on the front surface of the substrate 8. Lenses 10, 10,. 10 are arranged. Three projections 10 a, 10 a, 10 a projecting toward the substrate 8 side are juxtaposed in the circumferential direction on the periphery of the lens 10, and the tip of the projection 10 a is fixed to the front surface of the substrate 8 with an adhesive. .

  Support tables (not shown) are separately provided on the left and right sides of the front surface of the support plate 7, and the left and right edges of the deep dish type reflection sheet 11 are supported by the support table. On the bottom surface of the reflection sheet 11, a plurality of insertion holes 11a, 11a,..., 11a through which the lenses 10, 10,. Each lens 10 protrudes forward through the insertion hole 11a.

  A deep dish-shaped rear cabinet 12 is provided on the rear side of the support plate 7. The vertical and horizontal dimensions of the rear cabinet 12 and the vertical and horizontal dimensions of the front cabinet 4 are substantially the same, and the edge portion of the rear cabinet 12 and the edge portion of the front cabinet 4 face each other. Engagement convex portions and engagement concave portions (not shown) are provided at the edge portions of the front cabinet 4 and the rear cabinet 12, respectively, and the front cabinet 4 is connected to the rear cabinet by engaging the engagement convex portions and the engagement concave portions. 12 is fixed. The rear cabinet 12 accommodates a control board (not shown), and the LED 9 and the display panel 1 are driven based on an output signal from the control board.

2 is a front view schematically showing the LED 9 and the substrate 8 provided with the reflective sheet 11, and FIG. 3 is a cross-sectional view schematically showing the sheet holding rivet along the line III-III in FIG.
A plurality of insertion holes 8 a are arranged in the substrate 8 at equal intervals along the longitudinal direction of the substrate 8. As shown in FIG. 3, the support plate 7 has a plurality of insertion holes 7a at positions corresponding to the insertion holes 8a. The diameter of the insertion hole 7a is substantially equal to the diameter of the insertion hole 8a. In the reflective sheet 11, a plurality of through holes 11b and a through hole 11c are formed at positions corresponding to the plurality of insertion holes 8a. The through hole 11b is larger than the insertion hole 8a and has a smaller diameter than a head 21a of a sheet holding rivet 20 described later. On the other hand, the through hole 11c is larger than the insertion hole 8a and has a smaller diameter than a head portion 31a of a substrate fixing rivet 30 described later.

As shown in FIG. 2, a sheet holding rivet 20 and a substrate fixing rivet 30 are provided between the lenses 10.
As shown in FIG. 3, a sheet holding rivet 20 made of, for example, metal or carbon is inserted into the insertion hole 8 a and the insertion hole 7 a, and the substrate 8 is fixed to the support plate 7 by the sheet holding rivet 20. . The sheet holding rivet 20 includes a receiving rivet 22 and an insertion rivet 21.

  The receiving rivet 22 is provided with a hooking portion 22a having an annular shape with a diameter larger than the diameter of the insertion hole 8a, and the outer peripheral portion of the hooking portion 22a is outside the insertion hole 8a and the through hole 11b. On the inner side, it is hooked on the edge portion of the insertion hole 8a. A plurality of elastic portions 22b are juxtaposed in the circumferential direction on the inner peripheral portion of the latching portion 22a. The elastic portion 22b protrudes along the axial direction of the latching portion 22a and is inserted through the insertion hole 8a and the insertion hole 7a. The axial dimension of the elastic part 22b is longer than the axial dimension of the insertion hole 8a and the insertion hole 7a, and the protruding end of the elastic part 22b protrudes from the insertion hole 7a in the axial direction.

  At the protruding end of the elastic portion 22b, a contact portion 22c extending radially inward of the latching portion 22a is provided integrally with the elastic portion 22b, and the corresponding contact portions 22c are separated from each other in the radial direction. .

  A shaft portion 21b (described later) inserted into the latching portion 22a is in contact with the inside of the contact portion 22c, and the elastic portion 22b is curved outward by the contact of the shaft portion 21b, so that the elastic portion 22b is It is in contact with the edge portion of the insertion hole 7a. Therefore, the board | substrate 8 and the support plate 7 are clamped back and forth between the latching | locking part 22a and the elastic part 22b.

  The insertion rivet 21 includes a head portion 21a having a diameter larger than that of the through hole 11b, and a cylindrical shaft portion 21b perpendicular to the head portion 21a is provided at the center of the head portion 21a. A taper 21ba is formed at the tip of the shaft 21b so that the diameter of the shaft 21b decreases toward the tip. The diameter of the shaft portion 21b near the head portion 21a is substantially the same as the inner diameter of the hooking portion 22a, and is larger than the size between the contact portions 22c when the shaft portion 21b is not inserted. . The edge portion of the head portion 21a extends to the shaft portion 21b side, and the extending width of the edge portion of the head portion 21a is based on the axial dimension of the latching portion 22a, that is, the thickness dimension of the latching portion 22a. Is also small.

The shaft portion 21b of the insertion rivet 21 is inserted into the latching portion 22a, and the tip portion of the shaft portion 21b is inserted into the gap between the contact portions 22c.
As described above, the taper 21ba is formed at the tip portion of the shaft portion 21b so that the diameter of the shaft portion 21b decreases toward the tip. The dimension in which the shaft portion 21b is separated in the radial direction between the contact portions 22c before the shaft portion 21b is inserted into the latching portion 22a is shorter than the diameter of the shaft portion 21b near the head portion 21a. The taper 21ba is in contact with the contact portion 22c. When the taper 21ba comes into contact with the contact portion 22c, the elastic portion 22b is curved outward and is in contact with the edge portion of the insertion hole 7a.

  The head portion 21a is in contact with the latching portion 22a, and the head portion 21a and the reflection sheet 11 are not in contact with each other. A slight gap is provided between the edge portion of the head portion 21 a extending toward the shaft portion 21 b and the reflection sheet 11. The reflection sheet 11 is held by the edge portion of the head portion 21a. The support plate 7 and the substrate 8 are sandwiched with an appropriate pressure by the elastic portion 22b and the latching portion 22a, and the substrate 8 and the support plate 7 are brought into close contact with each other.

Next, the substrate fixing rivet 30 will be described. 4 is a cross-sectional view schematically showing the substrate fixing rivet 30 taken along line IV-IV in FIG.
The substrate fixing rivet 30 includes a receiving rivet 22 and an insertion rivet 31. The receiving rivet 22 of the substrate fixing rivet 30 has the same configuration as the receiving rivet 22 of the sheet holding rivet 20 described above, and the same reference numerals are given and detailed description thereof is omitted. As shown in FIG. 2, the reflection sheet 11 has a through hole 11c at a position corresponding to the substrate hole 8a. As shown in FIG. 4, the through hole 11c has a larger diameter than the substrate hole 8a.

  The insertion rivet 31 includes a head portion 31a having a slightly larger diameter than the through hole 11c, and a cylindrical shaft portion 31b projecting from the center portion of the head portion 31a and perpendicular to the head portion 31a.

  The head portion 31a is formed in a curved surface so as to gradually approach the shaft portion 31b side from the center portion toward the edge portion. The edge portion of the head portion 31a is formed thinner than the center portion, and the edge of the head portion 31a is rounded. The thickness of the edge portion (thin portion) of the head portion 31 a is approximately the same as that of the reflection sheet 11. In the axial direction of the shaft portion 31b, the dimension between the central portion of the head portion 31a and the edge portion of the head portion 31a is substantially the same as the thickness of the latching portion 22a. The head portion 31a is made of a synthetic resin having the same color (for example, white) as that of the reflection sheet 11 in order to increase the light reflection efficiency.

  A taper 31ba is formed at the tip of the shaft 31b so that the diameter of the shaft 31b decreases toward the tip. The diameter of the shaft portion 31b near the head portion 31a is substantially the same as the inner diameter of the hook portion 22a, and is larger than the radial dimension between the contact portions 22c when the shaft portion 31b is not inserted. It has become.

  The shaft portion 31b of the insertion rivet 31 is inserted into the hooking portion 22a, and the tip portion of the shaft portion 31b is inserted into the gap between the contact portions 22c. As described above, the taper 31ba is formed at the tip of the shaft portion 31b, and the taper 31ba is in contact with the contact portion 22c by the insertion of the shaft portion 31b. When the taper 31ba is in contact with the contact portion 22c, the elastic portion 22b is curved outward and is in contact with the edge portion of the insertion hole 7a.

  The central portion of the head portion 31a is in contact with the latching portion 22a. As described above, in the axial direction of the shaft portion 31b, the dimension between the central portion of the head portion 31a and the edge portion of the head portion 31a is substantially the same as the thickness of the hook portion 22a. The portion is in contact with the substrate 8 without being strongly pressed.

  Since the head portion 31a is located between the through hole 11c and the substrate 8, and the head portion 31a has a slightly larger diameter than the through hole 11c, the through hole 11c is formed on the edge portion (thin portion) of the head portion 31a. The edge part of is located. The through hole 11c is closed from the substrate 8 side by the head portion 31a, and the central portion of the head portion 31a slightly protrudes from the through hole 11c to the front side.

  In the display device according to the first embodiment, since the head portion 31a of the substrate fixing rivet 30 closes the through hole 11c, one surface of the substrate 8 is not exposed from the through hole 11c and corresponds to the through hole 11c. The optical characteristics are prevented from deteriorating without providing a resist portion at the location of the substrate 8. In addition, since the time for providing the resist portion on the substrate 8 is reduced, the display device can be assembled in a short time.

  The head portion 31a is formed in a curved shape so as to gradually approach the shaft portion 31b side from the center portion toward the edge portion, and the reflection sheet 11 is rounded on the edge of the head portion 31a. Can be prevented from generating wrinkles in the reflective sheet 11 by smoothly moving the edge portion of the through hole 11c on the surface of the head portion 31a.

  Further, since the edge portion of the through hole 11c is located at the edge portion of the head portion 31a located on the substrate 8 side, the reflection sheet 11 is close to the substrate 8, and the reflection sheet 11 is separated from the substrate 8 to deteriorate the optical characteristics. Can be prevented.

  Further, by inserting the shaft portion 31b into the latching portion 22a and bringing it into contact with the abutting portion 22c, the elastic portion 22b is curved outward in the radial direction of the annular latching portion 22a, and the elastic portion 22b and Since the board | substrate 8 and the support plate 7 are clamped between the latching | locking parts 22a, the board | substrate 8 can be fixed to the support plate 7 in a short time.

  Moreover, since LED9 is used as a light emitting element, power consumption and the emitted-heat amount can be suppressed, without reducing the brightness | luminance of the display panel 1. FIG.

  In the display device according to the first embodiment, the head portion 31a is made of a synthetic resin having the same color as that of the reflection sheet 11, but the head portion 31a is formed of a material having a color different from that of the reflection sheet 11, and the head portion is formed. You may apply | coat the coating material of the same color as the reflective sheet 11 on the surface of 31a. The display device according to the first embodiment uses the LED 9 as a light emitting element, but an LD (Laser Diode) or the like may be used.

(Embodiment 2)
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating a display device according to a second embodiment. FIG. 5 is a cross-sectional view schematically showing the board fixing screw. As shown in FIG. 5, the support plate 7 is provided with a plurality of screw holes 7b having internal threads formed on the inner peripheral surface at positions corresponding to the insertion holes 8a. The screw hole 7b penetrates, and the diameter of the screw hole 7b is substantially equal to the diameter of the insertion hole 8a. A washer 41 is coaxially arranged at the edge of the insertion hole 8a.

  A board fixing screw 40 is screwed into the screw hole 7b. The board fixing screw 40 includes a head 40a having a slightly larger diameter than the through hole 11c, and a cylindrical shaft 40b that protrudes from the center of the head 40a and is perpendicular to the head 40a.

  The head portion 40a is formed in a curved surface so as to gradually approach the shaft portion 40b side from the center portion toward the edge portion. The edge part of the head part 40a is formed thinner than the center part, and the edge part of the head part 40a is rounded. The thickness of the edge portion (thin wall portion) of the head 40 a is approximately the same as that of the reflection sheet 11. In the axial direction of the shaft portion 40b, the dimension between the central portion of the head portion 40a and the edge portion of the head portion 40a is substantially the same as the thickness of the washer 41. The surface of the head 40a is coated with a paint having the same color (for example, white) as the reflective sheet 11 in order to increase the light reflection efficiency.

  The shaft portion 40b is a male screw, and the diameter of the shaft portion 40b is substantially the same as that of the screw hole 7b and the insertion hole 8a. The shaft portion 40b is inserted into the insertion hole 8a from the substrate 8 side, and is screwed into the screw hole 7b.

  The central portion of the head 40 a is in contact with the washer 41. As described above, in the axial direction of the shaft portion 40b, the dimension between the central portion of the head portion 40a and the edge portion of the head portion 40a is substantially the same as the thickness of the washer 41. It is in contact with the substrate 8 without being strongly pressed.

  The head 40a is located between the through hole 11c and the substrate 8. As described above, the head 40a has a slightly larger diameter than the through hole 11c, so that it is above the edge portion (thin portion) of the head 40a. The edge part of the through-hole 11c is located in. The through hole 11c is closed from the substrate 8 side by the head 40a, and the central portion of the head 40a slightly protrudes from the through hole 11c to the front side.

  In the display device according to the second embodiment, the head 40a blocks the through hole 11c, so that one surface of the substrate 8 is not exposed from the through hole 11c, and the substrate 8 corresponds to the through hole 11c. Deterioration of optical characteristics is prevented without providing a resist portion. In addition, since the time for providing the resist portion on the substrate 8 is reduced, the display device can be assembled in a short time. Further, the substrate 8 can be firmly fixed to the support plate 7 by screwing the shaft portion 40 b into the screw hole 7 b provided in the support plate 7.

  In the display device according to the second embodiment, the same color (for example, white) paint as that of the reflection sheet 11 is applied to the surface of the head 40a. You may shape | mold with the raw material of the same color as the reflective sheet 11. FIG.

  Among the configurations of the display device according to the second embodiment, configurations similar to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

1 Display panel 7 Support plate 7a, 8a Insertion hole 7b Screw hole (insertion hole)
8 Substrate 9 LED (light emitting element)
DESCRIPTION OF SYMBOLS 11 Reflective sheet 11c Through-hole 22 Receiving rivet 22a Latching part 22b Elastic part 22c Contact part 30 Substrate fixing rivet (fixing member)
31 Insertion rivet 31a Head 31b Shaft 40 Board fixing screw (fixing member)
40b Shaft (male thread)

Claims (6)

A substrate on which a light emitting element for irradiating light to the display panel is mounted on one surface, a support plate for supporting the other surface of the substrate, and a plurality of insertion holes corresponding to each other provided on the substrate and the support plate, respectively. And a shaft protruding from the head, the shaft is inserted into each insertion hole from the one surface side, and the head is positioned on the one surface side to fix the substrate to the support plate In a display device comprising: a fixing member that is arranged; and a reflective sheet that is disposed on the one surface and reflects the light of the light emitting element, wherein the reflective sheet has a through hole at a position corresponding to the head.
The display device characterized in that the head has a diameter larger than that of the through hole and is located between the through hole and the substrate.   The display device according to claim 1, wherein a surface of the head has a curved surface shape. The edge portion of the head is located closer to the substrate than the center portion,
The display device according to claim 1, wherein an edge portion of the through hole is located at an edge portion of the head. An annular portion, and a latching portion for latching an outer peripheral portion to an edge portion of the insertion hole provided in the substrate;
A plurality of elastic portions that are arranged along the circumferential direction of the latching portion and project in the axial direction from the inner circumferential portion of the latching portion;
A contact portion extending radially inward from the end of the protruding elastic portion;
The display device according to claim 1, wherein the shaft portion is inserted into the latching portion and is brought into contact with the contact portion. The shaft is a male screw;
An internal thread is formed on the inner periphery of the insertion hole provided in the support plate,
The display device according to claim 1, wherein the shaft portion is screwed into the female screw.   The display device according to claim 1, wherein the light emitting element is an LED.

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