JP2009020174A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provided a liquid crystal display device capable of performing uniform illumination even when a fixation part for fixing a circuit board is projectingly provided on a holding member which is arranged in the rear of a liquid crystal display panel corresponding to a visible range of the liquid crystal display panel. <P>SOLUTION: The liquid crystal display includes: the liquid crystal display panel 1; the holding member 3 disposed in the rear of the liquid crystal display panel 1 and holding the liquid crystal display panel 1; the circuit board 5 disposed in the rear of the holding member 3 and having a light emitting diode 4 (light source) mounted thereon; and a screw 8 (a fixing member) for fixing the circuit board 5 to the fixation part 19 of the holding member 3, wherein the fixation part 19 is provided projectingly on the liquid crystal display panel 1 side at the part of the holding member 3 corresponding to the visible range of the liquid crystal display panel 1, and an opaque display design 10 is provided at a part of the liquid crystal display panel 1 corresponding to the fixation part 19. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device in which a circuit board is fixed to a holding member holding a liquid crystal display panel using a fixing member.

  As a display device using a liquid crystal display panel, for example, there is Patent Document 1. In Patent Document 1, a circuit board 22 on which a lamp 23 is mounted is disposed behind a reflector unit 13 (holding member) holding a liquid crystal display 6 (liquid crystal display panel), and the front side of the liquid crystal display 6 is a clear cover 7. A display device covered with is described. Although not shown, the circuit board 22 in such a display device is often screwed and fixed to the reflector unit 13 with screws. In Patent Document 1, a part to be screwed and fixed is generally a frame reflector 15 or a frame 17 outside the visible range of the liquid crystal display 6.

However, in the case of a display device having a large liquid crystal display 6 (wide display area), the circuit board 22 and the reflector unit 13 are likely to be shaken by vibration, and in order to suppress this, the screwed portion is within the visible range of the liquid crystal display 6. It is also necessary for the corresponding position. When screwing, since a fixing part longer than the length of the screw is required, a fixing part protruding to the front side of the display reflector 14 (liquid crystal display 6 side) must be provided.
JP 2006-58382 A

  However, if the fixed part protrudes behind the visible range of the liquid crystal display 6, when the lamp 23 is turned on and the liquid crystal display is transmitted and illuminated, especially the liquid crystal display (liquid crystal display panel) part near the fixed part is located. Tends to be a little dark and the visibility of the display device may be reduced.

  The present invention has been made in view of such points, and a fixing portion is provided so as to protrude from a holding member portion disposed behind the liquid crystal display panel and corresponding to the visible range of the liquid crystal display panel. Even if it exists, it aims at providing the liquid crystal display device which can be illuminated uniformly.

  In order to achieve the above object, the present invention provides a liquid crystal display panel, a holding member disposed behind the liquid crystal display panel and supporting the liquid crystal display panel, and a circuit having a light source mounted behind the holding member. And a fixing member that fixes the circuit board to the fixing portion of the holding member, and the fixing portion is provided to protrude toward the liquid crystal display panel at the holding member portion corresponding to the visible range of the liquid crystal display panel. The liquid crystal display panel portion corresponding to the fixed portion is provided with an impermeable display design.

  Moreover, the said fixing | fixed part consists of column shape.

  The display design is provided on the back side of the liquid crystal display panel.

  A liquid crystal display device that can be illuminated uniformly even when a fixing portion for fixing a circuit board is provided at a holding member portion disposed behind the liquid crystal display panel and corresponding to the visible range of the liquid crystal display panel. Can be obtained.

  FIG. 1 is a front view of a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a partial cross-sectional view of the liquid crystal display device (cross section AA in FIG. 1).

  The liquid crystal display device includes a liquid crystal display panel 1, a white diffuser plate 2 disposed on the back side of the liquid crystal display panel 1 and having light transparency, and a holding member 3 on which the liquid crystal display panel 1 and the diffuser plate 2 are supported. A hard circuit board 5 on which a plurality of light emitting diodes 4 are mounted as a light source that is arranged behind the holding member 3 and illuminates the liquid crystal display panel 1 and the diffusion plate 2 from behind, and the liquid crystal display panel 1 and the holding member 3. A metal holding frame 6 for fixing the circuit board 5 to the circuit board 5, a case 7 including an upper case 7A and a lower case 7B in which the liquid crystal display panel 1 and the circuit board 5 are accommodated, and the circuit board 5 and the lower case 7B. A screw 8 or the like is provided as a fixing member for adhering to the holding member 3.

  Although not shown, the liquid crystal display panel 1 encloses liquid crystal molecules between a front glass substrate and a rear glass substrate, attaches a front polarizing film on the front side of the front glass substrate, and a rear polarizing film on the back side of the rear glass substrate. Is pasted. When a signal (voltage) according to an external measurement amount is applied to an electrode portion (not shown) provided on each glass substrate, the operation state of the vehicle (for example, the vehicle speed, the engine speed, or the remaining fuel amount) is determined. The displayed liquid crystal display unit 9 appears black.

  The liquid crystal display panel 1 is provided with a display design 10 in addition to the liquid crystal display unit 9. The display design 10 is different from the liquid crystal display unit 9 that displays the vehicle speed and the like, and separates, for example, a speed display unit 9A and a fuel remaining amount display unit 9B, which are part of the liquid crystal display unit 9. Or has a decorative meaning such as bordering the periphery of the liquid crystal display unit 9 and is always visible. The display design 10 in the present embodiment is provided so as to surround the speed display portion 9A, and is impermeable to the back side (circuit board 5 side) of the rear glass substrate that is the back side of the liquid crystal display panel 1. It is printed in black. In FIG. 1, the description of the liquid crystal display units other than the speed display unit 9A and the remaining fuel amount display unit 9B is omitted.

  The upper case 7A has a see-through plate 11 made of a colorless and transparent synthetic resin disposed on the front side of the liquid crystal display panel 1, and a cover portion 12 and a side wall 13 integrally formed around the see-through plate 11. Yes. The cover 12 and the side wall 13 are made of, for example, black synthetic resin so that the inside of the case 7 cannot be seen. In addition, a hanging wall 14 projecting toward the liquid crystal display panel 1 is integrally provided on the see-through plate 11 of the cover portion 12 so that the inside of the case 7 is more difficult to see. The visible range is defined. That is, the area of the liquid crystal display panel 1 corresponding to the see-through plate 11 surrounded by the hanging wall 14 becomes the visible range.

  The holding member 3 is made of, for example, white synthetic resin, and includes a placement portion 15 on which the peripheral edges of the liquid crystal display panel 1 and the diffusion plate 2 are placed, a peripheral wall 16, a bottom wall 17, and the like. In the bottom wall 17, an opening hole 18 is provided corresponding to the light emitting diode 4 so that the light emitting diode 4 mounted on the circuit board 5 can face. Further, fixing portions 19 are provided at 17 locations on the bottom wall corresponding to the visible range of the liquid crystal display panel 1. The fixing portion 19 is provided so as to project from the bottom wall 17 to the liquid crystal display panel 1 side in order to fix the circuit board 5 and the lower case 7B to the holding member 3, and has a cylindrical shape. Note that the positional relationship between the fixed portion 19 and the display design 10 described above is such that the display design 10 is positioned at one place on the liquid crystal display panel corresponding to the fixed portion 19.

  The lower case 7B is made of, for example, black synthetic resin, and the peripheral edge thereof is fixed to the mounting boss 20 of the upper case 7A with, for example, screws 8A. The lower case 7B is provided with an attaching portion 21 for fixing in addition to the peripheral portion. The attachment portion 21 corresponds to the fixing portion 19 provided in the holding member 3 and is provided with an attachment hole 22 through which the screw portion of the screw 8 is inserted.

  The circuit board 5 is also substantially the same as the outer shape of the lower case 7B, and the peripheral edge is fixed to the mounting boss 20 of the upper case 7A as shown in FIG. The circuit board 5 is also fixed to a fixing portion 19 provided on the holding member 3, and has an attachment hole 22 </ b> A through which a screw portion of the screw 8 is inserted.

  The liquid crystal display device is assembled as follows. After the holding member 3, the diffusion plate 2, and the liquid crystal display panel 1 are placed on the circuit board 5, the holding frame 6 is mounted along the peripheral wall 16 of the holding member 3 from the front side of the liquid crystal display panel 1. Then, the leg portions 23 provided at a plurality of locations around the holding frame 6 are inserted into holes (not shown) provided in the circuit board 5 and bent. By doing so, the peripheral edge of the liquid crystal display panel 1 is pressed by the edge 24 of the pressing frame 6, and the liquid crystal display panel 1 and the holding member 3 are fixed to the circuit board 5. Although not shown, the electrical connection between the liquid crystal display panel 1 and the circuit board 5 is performed using a conductive rubber or a metal terminal.

  Next, the peripheral portions of the circuit board 5 and the lower case 7B are fixed to the mounting boss 20 of the upper case 7A with the screws 8A as described above. Further, the screw 8 is inserted into the mounting hole 22 provided in the lower case 7B and the mounting hole 22A of the circuit board and screwed to the fixing portion 19 provided in the holding member 3. The circuit board 5 and the lower case 7B are fixed to the fixing portion 19 by this screwing.

  In the liquid crystal display device configured as described above, for example, when the light emitting diode 4 that emits white light is turned on, the liquid crystal display panel 1 receives the light transmitted through the diffusion plate 2 from behind, and the display design 10 and the liquid crystal display unit 9. Other than the above, white is transmitted and illuminated. At this time, the fixed portion 19 of the holding member 3 protrudes toward the liquid crystal display panel 1, so that one portion of the liquid crystal display panel near the fixed portion 19 is likely to be slightly dark. However, the liquid crystal corresponding to the fixed portion 19 Since the non-transparent display design 10 is provided at one position on the display panel, uneven illumination hardly occurs and the entire liquid crystal display panel 1 can be illuminated uniformly.

  Further, by making the fixing portion 19 a columnar shape similar to the outer shape of the screw 8, the diameter of the fixing portion 19 facing the display design 10 of the liquid crystal display panel 1 can be made as small as possible, and uneven illumination can be suppressed. . Further, if the tip of the fixing portion 19 is chamfered, illumination unevenness is less likely to occur. Further, the display design 10 is provided on the back side of the rear glass substrate, which is the back side of the liquid crystal display panel 1, and the non-transparent display design 10 is on the side closer to the fixed portion 19, thereby causing more uneven illumination. It becomes difficult. The display design 10 may be provided on the back side (circuit board 5 side) of the rear polarizing film, which is the back side of the liquid crystal display panel 1.

  In the above embodiment, the lower case 7B is also fixed to the fixing portion 19 of the holding member 3 with the screw 8, but at least the circuit board 5 is fixed to the fixing portion 19. It ’s fine. Further, the visible range of the liquid crystal display panel 1 is determined by the hanging wall 14 of the upper case 7A, but the visible range of the liquid crystal display panel 1 may be determined by the edge 24 of the holding frame 6. In addition, the shape of the fixing portion 19 is not limited to a perfect circle and may be an ellipse or the like.

The front view of the liquid crystal display device which shows embodiment of this invention. FIG. 2 is a partial cross-sectional view of the same liquid crystal display device (cross section AA in FIG. 1).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 3 Holding member 4 Light emitting diode (light source)
5 Circuit board 8 Screw (fixing member)
10 Display design 19 Fixed part

Claims (3)

  A liquid crystal display panel, a holding member disposed behind the liquid crystal display panel and supporting the liquid crystal display panel, a circuit board disposed behind the holding member and mounted with a light source, and the circuit board mounted on the holding member A fixing member that is fixed to the fixing portion of the liquid crystal display panel, and the fixing portion protrudes toward the liquid crystal display panel at the holding member portion corresponding to the visible range of the liquid crystal display panel, and the liquid crystal corresponding to the fixing portion A liquid crystal display device, wherein a display panel portion is provided with an impermeable display design.   The liquid crystal display device according to claim 1, wherein the fixing portion has a cylindrical shape.   The liquid crystal display device according to claim 1, wherein the display design is provided on a back side of the liquid crystal display panel.

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