JP2002091325A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce the ground of a circuit. SOLUTION: The display device has a display panel part 2, a circuit board 3 disposed on the peripheral part of the panel part 2, and a metallic frame 5 which covers the display panel part 2 and the circuit board 3. A plurality of places of the circuit board 3 are fastened on the panel part 2 with screws 12, 15, the circuit board 3 is electrically connected to the frame 5 through a screw fastened part 14, thereby realizing ground reinforcement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a display device.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional display device (liquid crystal display device).
It is a rear view which shows the principal part of. As shown in this figure, the conventional display device has circuit boards 100 and 101 arranged on one surface, in this example, the back surface. The first circuit board 100 arranged in the longitudinal direction of the display device is a board designed to handle a signal with a higher clock frequency than the second circuit board 101 arranged in the transverse direction. This first
The circuit board 100 has both ends fixed by screws 102 and a second
Connected to the circuit board 101.

[0003] With the increase in size and definition of display devices, the amount of data to be handled has increased, and the frequency of clock signals for data processing has increased. In order to handle such a high-speed clock signal, it is important to stabilize the ground potential of the circuit. Also, in order to take measures against EMI, it is necessary to enhance the electromagnetic shielding function disposed around the circuit boards 100 and 101.

Further, as the size of the display device increases and the overall length of the circuit board increases, the amount of deformation of the circuit board also increases, and it is difficult to correct the deformation of the circuit board only by screwing both ends. When warpage deformation occurs on the circuit board,
Improper stress is applied to the display panel to adversely affect the display state. Furthermore, the deformation of the circuit board has a bad influence on the connection state of the flexible circuit connecting the display panel and the circuit board.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to enhance the ground of a circuit. Also,
One of the tasks is to enhance the electromagnetic shielding function.
Another object is to prevent deformation of a circuit board. Another object is to improve a display state of a display device.

[0006]

According to a first aspect of the present invention, there is provided a display device, comprising: a display panel portion; a circuit board disposed around the panel portion; and the display panel portion and the circuit board. A display device including a metal frame that covers the panel, wherein a plurality of portions of the circuit board are screwed to the panel portion, and the circuit board is electrically connected to the frame via screwing portions. I do.

According to another aspect of the present invention, a display device includes a display panel, a circuit board disposed on a back surface of the panel, and a metal frame that covers the display panel. In the display device, a plurality of portions of the circuit board may be screwed to the panel portion, and the circuit board may be electrically connected to the frame via metal fittings arranged at the screwing locations.

According to a third aspect of the present invention, in a display device having a display panel portion and a metal frame covering the display panel portion, one side of the display panel portion is provided. Characterized in that the frame is used as short-circuiting means for short-circuiting one end and the center of a circuit arranged along the line.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 using a liquid crystal display device as an example. Figure 1
Is a rear view of the main part of the liquid crystal display device 1 as viewed from the back,
FIG. 2 is an enlarged cross-sectional view taken along the line XX of FIG.

As shown in FIGS. 1 and 2, a liquid crystal display 1
Are a display panel unit 2 for liquid crystal display, first and second circuit boards 3 and 4 disposed on one surface of the panel unit 3, in this example, a back surface, and a metal cover for covering the display panel unit 2. It comprises a frame 5.

The display panel section 2 is constructed by arranging an active type or passive type liquid crystal display panel 6 and a backlight 7 for back lighting thereof on a resin mounting frame 8. In the case where the backlight 7 is unnecessary as in the above, the main part can be constituted by the display panel 6 and the mounting frame 8.

The liquid crystal display panel 6 has a structure in which a liquid crystal layer is sandwiched between a pair of flat rectangular substrates 6a, 6a, and polarizing plates 6b, 6b are arranged on at least one of the upper and lower sides, in this example, on both sides. . The panel 6 has an edge portion supported by a step surface 8 a above the mounting frame 8. The backlight 7 is an edge light type surface light source in which a light source (not shown) is disposed on one side surface of a transparent light guide plate 7a having the same dimensions as the liquid crystal panel 6, but a backlight having another configuration is employed. You can also. In the backlight 7, one or a plurality of optical sheets 7b such as a prism lens sheet and a diffusion sheet are arranged on the upper surface of the light guide plate 7a, and the reflection sheet 7c is arranged on the lower surface, but other configurations are adopted. You can also. The edge of the backlight 7 is supported by a step surface 8b below the mounting frame 8.

The first circuit board 3 is a circuit board which mainly constitutes a circuit section for processing display data transferred in synchronization with a high-speed clock signal. It is arranged along. The second circuit board 4
A circuit board that mainly constitutes a circuit unit for processing a signal for display scanning, and is arranged along a short side of the display panel unit 2. A ground pattern for supplying a reference potential (generally ground or earth potential) is provided on one or both surfaces of the first and second circuit boards 3 and 4 over substantially the entire length of the board. Range.

The first and second circuit boards 3 and 4 are connected to each other via a connector cable 11a, and are connected to the display panel 6 via flexible circuits 9 and 10.
Connected to A predetermined bias voltage and a control signal are mainly supplied to the first circuit board 3 via the connector cable 11a, and display data is mainly supplied via the connector 11b.

Although the first and second circuit boards 3 and 4 can be arranged so as to be flush with the display panel 6,
In this example, a plurality of divided flexible substrates 9, 1
By folding 0 into a U-shape, the first and second circuit boards 3 and 4 are arranged so as to overlap on the back side of the display panel 6. Each of the flexible substrates 9 and 10 has a built-in drive LSI. However, if necessary, the functions of the drive LSI can be built in the circuit boards 3 and 4 and the panel 6.

The first and second circuit boards 3 and 4 arranged on the back side of the display panel section 2 are each provided with a plurality of screws 1.
The screws 2 and 13 fix the screws to the mounting frame 8. First
The circuit board 3 is fixed between predetermined flexible boards 9 in addition to both ends in the longitudinal direction by a plurality of screws 12. In this example, two screw-fixing portions are provided at two positions where the interval between the flexible substrates 9 is set wider than the others for screwing. A metal connection fitting 14 is mounted corresponding to a screw stop position by the screw 12.
The connection fitting 14 has an L-shaped cross section so as to straddle the side surface and the back surface of the mounting frame 8. When the first circuit board 3 is fixed to the frame 8 by the screws 12, a ground pattern or a ground terminal (not shown) formed on the upper surface of the first circuit board 3 in correspondence with the connection fitting 14 is connected. The metal contacts the metal fitting 14, and both are electrically connected.

The second circuit board 4 is fixed between the predetermined flexible boards 9 at both ends in the longitudinal direction by a plurality of screws 13, as in the case of the first circuit board 3. In addition to both ends, the central part can be fixed by the screw 13. The same structure as the fixing position by the screw 12 is adopted at the screw fixing position of the second circuit board 4 by the screw 13. That is, by fixing the screw 13, a connection fitting equivalent to the connection fitting 14 is electrically connected to the ground pattern of the second circuit board 4.

The metal frame 5 exposes the effective display area of the display panel section 2 from the central window 5a.
Is formed of a conductive metal plate which is processed into a frame shape so that the frame 5b having an L-shaped cross section covers the periphery of the frame. The frame 5 mounted so as to cover the display panel unit 2 is screwed and fixed to the mounting frame 8 by fixing a screw 15 to a screw hole provided in a vertical portion of the frame 5b. In addition to the screw fixing, the frame can be fixed by using a structure in which a part of the frame 5b is bent and locked to the mounting frame 8 side.
Since the screw 15 penetrates the connection fitting 14 and is fixed to the mounting frame 8, the fixing of the screw 15 causes the connection fitting 14 and the inner surface of the frame 5 to be in close contact with each other, so that the electrical connection between the two is ensured. Is executed. Screw 1 of the second circuit board 4
Also in the fixing position by 3, the screw fixing similar to the fixing using the screw 15 is performed.

As described above, since the ground pattern formed on the first circuit board 3 is connected to the frame 5 via the respective connection fittings 14, the frame 5 is maintained at a ground potential effective for EMI measures. At the same time, the ground pattern formed along the long circuit board 3 is connected to the frame 5 at a plurality of locations in the longitudinal direction, so that the frame 5 can be effectively used to strengthen the ground of the circuit board 3. Can be used. That is, when a long ground pattern formed along the circuit board 3 is connected to the ground potential only at both ends in the longitudinal direction, the potential at the center of the ground pattern is more likely to rise than at both ends. Can be used as a short-circuit member to short-circuit at least one end and the center part, in this example, both ends and the center part, so that the ground potential of the circuit board 3 is kept in a state where the fluctuation is small along the longitudinal direction. Can be. The second circuit board 4 is also screwed in the same manner as the first circuit board 3, so that the fluctuation of the ground potential can be suppressed in the same manner as the first circuit board 3.

By screwing the long circuit board 3 (same for the board 4) so as to be divided into a plurality of pieces in the longitudinal direction, there are the following advantages in addition to the strengthening of the ground.
First, the warpage of the substrate 3 can be prevented as compared with the case where only both ends are fixed. Since warpage deformation can be prevented, the stress applied to the connection portion of the flexible substrate 9 can be reduced to prevent disconnection and the like. Further, it is possible to reduce the stress applied to the parts constituting the display panel 6 and the backlight 7 and to prevent the occurrence of undesired optical phenomena such as optical interference. A reinforcing member such as a double-sided adhesive tape separately provided for preventing deformation of the circuit board can be omitted, and the number of components can be reduced.

[0021]

As described above, according to the present invention, it is possible to enhance the ground of the circuit board and the EMI countermeasures. As a result, the circuit operation can be stabilized.
Further, deformation of the substrate can be prevented. Further, occurrence of disconnection of the circuit and the like can be prevented. Further, the configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a rear view illustrating a main part of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a portion XX in FIG.

FIG. 3 is a rear view of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Display panel part 3 1st circuit board 4 2nd circuit board 5 Frame 6 Display panel

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuhisa Katsukawa 3-201 Minamiyoshikata, Tottori-shi, Tottori Prefecture Inside Sanyo Electric Co., Ltd. (72) Inventor Jun Shirako 3-201 Minamiyoshikata, Tottori-shi, Tottori Prefecture F-term (reference) in Denki Co., Ltd. 2H089 HA40 QA10 TA18 TA20 5G435 AA09 AA16 BB12 BB15 EE03 EE04 EE13 EE27 EE33 EE36 EE41 EE47 FF05 FF08 GG22 GG33 GG34 HH12

Claims (3)

[Claims] 1. A display device comprising: a display panel section; a circuit board disposed around the panel section; and a metal frame that covers the display panel section and the circuit board. A display device, wherein the circuit board is screwed to a panel portion, and the circuit board is electrically connected to the frame via a screwed portion. 2. A display device comprising: a display panel portion; a circuit board disposed on a back surface of the panel portion; and a metal frame that covers the display panel portion, wherein a plurality of portions of the circuit board are screwed to the panel portion. The display device, wherein the circuit board is stopped and the circuit board is electrically connected to the frame via a metal fitting arranged at a screwing position. 3. A display device comprising a display panel portion and a metal frame covering the display panel portion, wherein one end and a central portion of a circuit arranged along one side of the display panel portion are short-circuited. A display device using the frame as a short-circuiting means.