WO2012164941A1

WO2012164941A1 - Image display device

Info

Publication number: WO2012164941A1
Application number: PCT/JP2012/003589
Authority: WO
Inventors: 清隆中瀬
Original assignee: パナソニック株式会社
Priority date: 2011-06-03
Filing date: 2012-05-31
Publication date: 2012-12-06
Also published as: JP2014149317A

Abstract

A panel (11) of a plasma display device is provided with a front surface substrate (1) and a back surface substrate (2) disposed facing this front surface substrate (1), and the peripheral part of the front surface substrate (1) and peripheral part of the back surface substrate (2) are bonded by a sealing material (22). The panel (11) is held on the front surface side of a chassis base part (20a) of a chassis member (20). The chassis member (20) is provided with a wave-shaped reinforcing part (20b) in a position outside of an image display area (A) of the panel (11) and inside of the sealing material (22) away from the chassis base part (20a). Thus, occurrences of cracks in the panel (11) with dropping impact, vibration, and outside force can be prevented.

Description

Video display device

The present disclosure relates to a flat panel display type image display apparatus such as a plasma display apparatus using a plasma display panel (hereinafter referred to as a panel) as a display device.

Panels used in this plasma display device are roughly classified into AC type and DC type in terms of driving, and there are two types of discharge types: surface discharge type and counter discharge type. At present, the mainstream of plasma display devices is the surface discharge type of a three-electrode structure because of high definition, large screen, and easy manufacturing.

In this surface discharge type plasma display panel structure, at least a pair of substrates whose front sides are transparent are arranged to face each other so that a discharge space is formed between the substrates, and partition walls for dividing the discharge space into a plurality of substrates are arranged on the substrate. is doing. In addition, a plurality of discharge cells are configured by arranging a group of electrodes on the substrate so that a discharge is generated in a discharge space partitioned by the barrier ribs, and providing phosphors that emit red, green, and blue light emitted by the discharge. Yes. The phosphor is excited by vacuum ultraviolet light having a short wavelength generated by discharge, and red, green, and blue visible light is emitted from red, green, and blue discharge cells, respectively, to perform color display.

Such a plasma display device can display at a higher speed than a liquid crystal panel, has a wide viewing angle, is easy to enlarge, and has a high display quality due to a self-luminous type. Have. For this reason, plasma display devices have recently attracted particular attention among flat panel displays, and have various applications as video display devices in places where many people gather and video display devices for enjoying large screen images at home. Is used.

In such a plasma display device, a glass-main panel is held on the front side of a chassis member made of metal such as iron or aluminum, and a drive circuit for causing the panel to emit light on the back side of the chassis member is configured. A module is configured by arranging a circuit board to be used (see Patent Document 1).

JP 2003-131580 A

Incidentally, in recent years, in plasma display devices, there has been an increasing demand for thinner products in order to improve design.

As the plasma display device becomes thinner in this way, the strength of the product decreases, and there is a risk of panel cracking due to drop impact and vibration during transportation and external forces during installation. In the case of other flat display type video display devices as well as plasma display devices, measures against drop impact, vibration and external force are required.

The present disclosure has been made to solve the above-described problem, and an object thereof is to provide an image processing apparatus that is less likely to cause panel cracking even when subjected to a drop impact, vibration, or external force.

In order to solve this problem, the video display device of the present disclosure includes a front substrate and a rear substrate disposed opposite to the front substrate, and the outer peripheral portion of the front substrate and the outer peripheral portion of the rear substrate are formed of a sealing material. And a chassis member having a chassis base portion that holds the display panel on the front side. The chassis member is located outside an image display area of the display panel and inside the sealing material. And a wave-shaped reinforcing portion that alternately protrudes toward the back side and protrudes toward the front side toward the outside with respect to the image display region.

According to the present disclosure, it is possible to easily obtain a predetermined strength even if the product is thinned, and it is possible to obtain a plasma display device in which panel cracks are unlikely to occur even when subjected to a drop impact, vibration, or external force.

The exploded perspective view which looked at the plasma display device concerning an embodiment from the back side. The perspective view which shows the principal part of a panel. 1 is a circuit block diagram of a plasma display device according to an embodiment. The rear view of the state which removed the back cover of the plasma display apparatus which concerns on embodiment. (A) is a front view of the panel of the plasma display apparatus which concerns on embodiment, (b) is the back view. The rear view which shows the structure of the data driver periphery part of the plasma display apparatus which concerns on embodiment. The partial expanded sectional view of the plasma display apparatus concerning an embodiment. The front view of the chassis member with which the plasma display apparatus concerning an embodiment is provided.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

The applicant provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and is not intended to limit the subject matter described in the claims. Absent.

Hereinafter, a plasma display device according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 8, but the embodiment of the present disclosure is not limited to this. In addition, the meanings of terms related to positions and directions in the following description are as follows unless otherwise specified. Referring to FIG. 1, the terms “front” and “back” refer to a display panel 11 (hereinafter simply referred to as a panel). That is, the side of the panel 11 on which an image is displayed in the image display area (see symbol A in FIG. 7) is the “front”, and the opposite side is the “back”. “Inside” and “outside” are based on the image display area A. In other words, the position close to the specific position from the center of the image display area A is “inside” the specific position. Conversely, a position far from the center of the image display area A with respect to a specific position is “inside” with respect to the specific position. “Top”, “Bottom”, “Left”, and “Right” are based on the direction of the panel 11 as viewed from the front side when the plasma display apparatus is in a use posture.

As shown in FIG. 1, the plasma display device includes a panel 11 having a substantially rectangular plate and a driving circuit block 18 that holds the panel 11 on the front surface via a heat dissipation sheet 21 and drives the panel 11 on the rear surface side. A chassis member 20. The chassis member 20 also has a generally rectangular plate shape as a whole. A module including the panel 11, the chassis member 20, and the drive circuit block 18 includes a front cover 23 disposed on the front side of the panel 11 and a metal back cover 24 disposed on the rear side of the chassis member 20. Housed in a housing. The back cover 24 is provided with a plurality of vent holes 24a for releasing heat generated by the module to the outside. In order to facilitate understanding of the overall structure, the structure of each element is simplified in FIG.

First, the structure of the panel 11 will be described with reference to FIG. As shown in FIG. 2, the panel is configured by disposing a glass front substrate 1 and a back substrate 2 so as to form a discharge space therebetween. On the front substrate 1, a plurality of scanning electrodes 3 and sustaining electrodes 4 constituting display electrodes are formed in parallel with each other. A dielectric layer 5 is formed so as to cover the scan electrode 3 and the sustain electrode 4, and a protective layer 6 is formed on the dielectric layer 5.

A plurality of data electrodes 8 covered with an insulator layer 7 are provided on the back substrate 2, and a grid-like partition wall 9 is provided on the insulator layer 7. A phosphor layer 10 is provided on the surface of the insulator layer 7 and on the side surfaces of the partition walls 9. The front substrate 1 and the rear substrate 2 are arranged to face each other so that the scan electrodes 3 and the sustain electrodes 4 and the data electrodes 8 cross each other. And a mixed gas of xenon. A portion where a pair of scan electrodes 3 (SCi: i = 1 to n) and sustain electrodes 4 (SUi: i = 1 to n) intersect with one data electrode 8 (Dj: j = 1 to m) Discharge cells are formed, and m × n discharge cells are formed in the discharge space. Note that the structure of the panel is not limited to the above-described structure, and for example, a structure having a stripe-shaped partition may be used.

FIG. 3 is a circuit block diagram of a plasma display device using this panel. The plasma display device includes a panel 11, an image signal processing circuit 12, a data electrode drive circuit 13, a scan electrode drive circuit 14, a sustain electrode drive circuit 15, a timing generation circuit 16, and a power supply circuit (not shown).

The image signal processing circuit 12 converts the image signal sig into image data for each subfield. The data electrode drive circuit 13 converts the image data for each subfield into a signal corresponding to each data electrode 8 (D1 to Dm), and drives each data electrode 8 (D1 to Dm). The timing generation circuit 16 generates various timing signals based on the horizontal synchronization signal H and the vertical synchronization signal V, and each drive circuit block 18 (data electrode drive circuit 13, scan electrode drive circuit 14, sustain electrode drive circuit 15). ). Scan electrode drive circuit 14 supplies a drive voltage waveform to scan electrodes 3 (SC1 to SCn) based on the timing signal. Sustain electrode drive circuit 15 supplies a drive voltage waveform to sustain electrodes 4 (SU1 to SUn) based on the timing signal. Here, the scan electrode drive circuit 14 and the sustain electrode drive circuit 15 include a sustain pulse generator 17.

Referring to FIG. 1 again, the chassis member 20 as a holding plate also serves as a heat sink made of one metal plate such as iron or aluminum. The configuration of the chassis member 20 will be described later. As described above, the panel 11 is held on the front surface side of the chassis member 20 by adhering the heat dissipation sheet 21 to the chassis member 20 with an adhesive or the like. Further, as shown in FIG. 4, a plurality of drive circuit blocks 18 for displaying and driving the panel 11 are arranged on the rear side of the chassis member 20.

The heat dissipating sheet 21 is for adhering and holding the panel 11 to the front surface side of the chassis member 20, efficiently transferring the heat generated in the panel 11 to the chassis member 20, and dissipating heat. It is about 2 mm. As the heat radiating sheet 21, an insulating heat radiating sheet in which a synthetic resin material such as acrylic, urethane, silicon resin, or rubber contains a filler that enhances thermal conductivity, a graphite sheet, a metal sheet, or the like can be used. Further, the heat radiation sheet 21 itself has an adhesive force so that the panel 11 is adhered and held to the chassis member 20 only by the heat radiation sheet, or the heat radiation sheet 21 has no adhesive force, and the panel 11 is formed using a double-sided adhesive tape. The structure etc. which adhere | attach to the chassis member 20 can be used.

As shown in FIG. 5, the panel 11 has a structure in which the outer peripheral portions of the front substrate 1 and the rear substrate 2 are bonded together by a sealing material 22. A flexible wiring board 25 as a display electrode wiring member connected to the

electrode lead portions

11 a and 11 b of the scan electrode 3 and the sustain electrode 4 is provided on both side edges of the panel 11. The flexible wiring board 25 is drawn to the back side through the outer peripheral portion of the chassis member 20, and is connected to the drive circuit board 27 of the scan electrode drive circuit 14 and the drive circuit board 26 of the sustain electrode drive circuit 15 via connectors. .

On the other hand, a plurality of flexible wiring boards 28 as data electrode wiring boards connected to the electrode terminal portions 11 c of the data electrodes 8 are provided at the lower end of the panel 11. The flexible wiring board 28 is routed to the back side through the outer peripheral portion of the chassis member 20 and is electrically connected to each of the plurality of data drivers 29 of the data electrode driving circuit 13 for applying a driving voltage to the data electrodes 8. At the same time, it is electrically connected to the drive circuit board 30 of the data electrode drive circuit 13 disposed at the lower position on the back side of the chassis member 20. In FIG. 6, the data driver 29 has a structure in which a semiconductor chip is arranged on a heat sink and each of a plurality of electrode pads of the semiconductor chip is connected to a wiring pattern of the flexible wiring board 28. The drive circuit board 30 is provided with a connector 30 a for connecting the flexible wiring board 28.

The control circuit board 31 (including the image signal processing circuit 12 and the timing generation circuit 16 shown in FIG. 3) is disposed at a substantially central portion of the chassis member 20. The control circuit board 31 receives image data based on an image signal sig sent from an input signal circuit block 32 having an input terminal portion to which a connection cable for connecting to an external device such as a television tuner is detachably connected. An image data signal corresponding to the number of pixels of the panel 11 is converted and supplied to the drive circuit board 30 of the data electrode drive circuit 13. Further, the control circuit board 31 generates a discharge control timing signal and supplies it to the drive circuit board 26 of the scan electrode drive circuit 14 and the drive circuit board 27 of the sustain electrode drive circuit 15, respectively, and display drive control such as gradation control. I do.

The power supply block 33 supplies a voltage to each of the circuit blocks, and is arranged at a substantially central portion of the chassis member 20 like the control circuit board 31. A commercial power supply voltage is supplied to the power supply block 33 through a connector to which a power supply cable (not shown) is attached. In addition, a cooling fan (not shown) is disposed at an angle in the vicinity of the

drive circuit boards

26, 27, and 30, and the

drive circuit boards

26, 27, and 30 are caused by wind sent from the cooling fan. Is cooled.

As shown in FIG. 7, a front filter 34 provided with an unnecessary radiation suppressing film for suppressing unnecessary radiation of an optical filter and electromagnetic waves is attached to the front side of the panel 11. The front cover 23 is made of resin or metal and has an opening 23a through which the image display area A on the front side of the panel 11 is exposed. A front frame 23b is provided around the opening 23a to cover the non-display area so that the non-display area is not visible to the customer. A decorative plate 23c is attached to the front frame 23b in order to enhance the appearance design of the plasma display device.

Hereinafter, a reinforcing structure for preventing the panel 11 from cracking against a drop impact, vibration, and external force will be described mainly with reference to FIGS. 7 and 8.

The chassis member 20 includes a substantially rectangular plate-shaped chassis base portion 20a having a pair of long sides and a pair of short sides. The panel 11 is held on the front side of the chassis base 20a, and the drive circuit block 18 (see FIGS. 1 and 4) for driving the panel 11 is arranged on the back side. As shown in FIG. 8, reinforcement for reinforcing mechanical strength by folding the outer peripheral end of the chassis base portion 20 a, that is, a pair of long sides and a pair of short sides into a corrugated plate shape. Each part 20b is provided. Hereinafter, the reinforcing portion 20b will be described in detail.

First, the reinforcing portion 20b is inclined rearward with respect to the chassis base portion 20a at a position outside the image display area A and inside the inner end of the sealing material 22 (position in the area indicated by reference numeral B). A first bent portion 20c that is bent at about 45 degrees with respect to the image display surface of the panel 11 in the present embodiment, and a first extending portion 20d that extends from the first bent portion 20c toward the back side are provided. In other words, the first extending portion 20d rises from the chassis base portion 20a at the first bent portion 20c. In other words, the panel 11 is held with respect to the chassis base portion 20 on the outer side of the image display area A and on the inner side of the first bent portion 20 c positioned on the inner side of the inner end portion of the sealing material 22. However, the panel 11 is separated from the chassis base portion 20a outside the first bent portion 20c.

The reinforcing portion 20b includes a second bent portion 20e obtained by obliquely bending the front end of the first extending portion 20d toward the front side, and an obliquely front side from the second bent portion 20e (in this embodiment, the image display of the panel 11). A second extending portion 20f extending at 45 degrees with respect to the surface.

Furthermore, the reinforcing portion 20b includes a third bent portion 20g obtained by obliquely bending the tip of the second extended portion 20f to the back side, and a third extended portion 20h extending obliquely from the third bent portion 20g to the back side.

Furthermore, the reinforcing portion 20b includes a fourth bent portion 20i that is bent obliquely from the tip of the third extended portion 20h to the front river, and a fourth extended portion 20j that extends obliquely from the fourth bent portion 20i to the front side. .

In the present embodiment, the first bent portion 20c, the first extended portion 20d, the second bent portion 20e, and the second extended portion 20f are formed with ribs projecting to the back side having a substantially isosceles triangular cross section. Further, a rib projecting toward the back side of an isosceles triangle having the same cross section is formed by the third bent portion 20g, the third extended portion 20h, the fourth bent portion 20i, and the fourth extended portion 20j. That is, two ribs having a triangular cross section are provided in succession, thereby forming a corrugated reinforcing portion 20b. Note that the height of the second and fourth bent portions 20e and 29i located on the back side with respect to the chassis base portion 20a from the chassis base portion 20a is about 5 mm to 15 mm.

The overall rigidity of the chassis member 20 is improved by providing the corrugated reinforcing portion 20b having four bent portions, that is, the first to fourth

bent portions

20c, 20e, 20g, and 20i. First, the overall rigidity improvement of the chassis member 20 makes it difficult for the panel 11 held by the chassis base portion 20a to crack against a drop impact or an external force.

As described above, the first bent portion 20c that forms the rising of the first extending portion 20d from the chassis base portion 20a is located outside the image display area A and inside the end portion of the sealing material 22. Is set. The position setting of the first bent portion 20c is important for enhancing the resistance of the panel 11 to a drop impact or an external force. Hereinafter, this point will be described in detail.

Generally, panel cracks due to drop impact or external force often occur in the vicinity of the sealing material 22. In the present embodiment, the first bent portion 20 c, which is a position where the chassis member 20 a starts to separate from the panel 11, is set on the inner side of the inner end portion of the sealing material 22. Therefore, a portion outside the first bent portion 20 c of the panel 11, that is, an outer peripheral portion (including a portion where the sealing material 22 is disposed) is not held by the chassis member 20. In other words, the portion outside the first bent portion 20c of the panel 11 is in a state like a free end in terms of a cantilever (the first bent portion 20c becomes a fixed end in terms of a cantilever). . Therefore, since the drop impact and external force transmitted from the chassis member 20 to the portion where the sealing material 22 of the panel 11 is present are significantly reduced, local deformation of the panel 11 in the vicinity of the sealing material 22 can be effectively suppressed. As a result, the resistance of the panel 11 to drop impact and external force is improved.

On the other hand, it is not preferable from the viewpoint of the image quality displayed on the panel 11 that the position of the first bent portion 20c, that is, the position where the chassis member 20a starts to move away from the panel 11 is in the image display area A. In the present embodiment, the first bent portion 20c is set at a position outside the image display area A and inside the inner end portion of the sealing material 22, thereby preventing the panel 11 from cracking without causing image quality deterioration. Effective prevention is realized.

In the present embodiment, a second bent portion 20e, a second extended portion 20f, a third bent portion 20g, a third extended portion 20h, and a fourth bent portion 20i are further added to the tip of the first extended portion 20d rising from the first bent portion 20c. Since the fourth extending portion 20j is provided and the reinforcing portion 20b has a corrugated shape, the first bent portion 20c is located outside the image display area A and inside the end portion of the sealing material 22 as described above. While satisfying the condition of setting the position, the rigidity of the reinforcing portion 20b itself is effectively enhanced. The improvement in the rigidity of the reinforcing portion 20b itself also improves the resistance of the panel 11 to a drop impact and an external force, and makes it difficult for cracks to occur.

In addition, the corrugated reinforcing portion 20b is provided on substantially the entire circumference of the outer peripheral edge of the chassis member 20, that is, on four sides of the rectangular shape. This also improves the overall rigidity of the chassis member 20 and makes it difficult for the panel 11 held by the chassis base portion 20a to crack against a drop impact or external force.

Further, in the present embodiment, as shown in FIG. 7, the reinforcing portion 20 a has screws, rivets, and the like on the back cover 24 that is disposed so as to cover the chassis member 20 in the second and fourth bent portions 20 e and 20 i. The fixing

members

36 and 37 are used. As described above, by fixing the chassis member 20 and the back cover 24, the strength of the outer peripheral portion of the casing of the plasma display device is improved, thereby suppressing the deformation of the panel 11 attached to the chassis member 20. The panel can be prevented from cracking due to an impact applied during transportation. Further, since the strength of the outer peripheral portion of the casing of the plasma display device is improved, sufficient strength can be secured even if the side wall dimension of the casing is reduced, and the casing of the plasma display device can be thinned. . In FIG. 7, reference numeral 38 denotes a fixing member such as a screw for attaching the chassis member 20 to the front cover 23, and reference numeral 39 denotes a fixing member such as a screw for attaching the back cover 24 to the front cover 23.

As described above, in the present embodiment, the front substrate 1 and the rear substrate 2 disposed opposite to the front substrate 1 are provided, and the outer peripheral portion of the front substrate 1 and the outer peripheral portion of the rear substrate 2 are formed by the sealing material 22. The panel 11 having the bonded structure is held on the front side of the chassis base portion 20a of the chassis member 20, and the chassis member 20 is positioned outside the image display area A of the panel 11 and inside the sealing material 22. Wave-shaped reinforcement which repeats the protrusion toward the back side and the protrusion toward the front side toward the outside with respect to the image display area A by the first bent portion 20c bent toward the back side with respect to the base portion 20a. The unit 20b is provided. Therefore, the panel outer peripheral portion can be configured to be a free end against a panel impact caused by a drop impact or an external force generated from the vicinity of the sealing material 22, so that local deformation in the vicinity of the sealing material 22 is suppressed. The panel 11 can be prevented from cracking without causing image quality degradation.

The present disclosure has been described by taking a plasma display device as an example. The present disclosure is not limited to this, and can also be applied to embodiments in which changes, replacements, additions, omissions, etc. are made as appropriate. The present disclosure can also be applied to a flat panel display type video display device having a similar structure. Further, the shape of the reinforcing portion is not limited to that of the embodiment as long as it has a wave shape that alternately repeats the protrusion toward the rear side and the protrusion toward the front side toward the outer side with respect to the image display area.

As described above, the embodiment considered as the best mode by the applicant and other embodiments are provided by the attached drawings and detailed description. These are provided to those skilled in the art to illustrate the claimed subject matter by reference to specific embodiments. Therefore, the constituent elements described in the accompanying drawings and the detailed description may include not only the constituent elements essential for solving the problem but also other constituent elements. Therefore, just because those non-essential components are described in the accompanying drawings and detailed description, the non-essential components should not be recognized as essential immediately. Various modifications, replacements, additions, omissions, and the like can be made to the above-described embodiments within the scope of the claims and the equivalent scope thereof.

As described above, the present disclosure is useful for providing a flat panel display-type image display device such as a plasma display device that is thin and is less likely to cause panel cracking due to drop impact, vibration, and external force.

DESCRIPTION OF SYMBOLS 1 Front substrate 2 Back substrate 3 Scan electrode 4 Sustain electrode 5 Dielectric layer 6 Protective layer 7 Insulator layer 8 Data electrode 9 Partition 10 Phosphor layer 11 Panel 11a Electrode extraction part 11b Electrode extraction part 11c Electrode extraction part 12 Image signal processing Circuit 13 Data electrode drive circuit 14 Scan electrode drive circuit 15 Sustain electrode drive circuit 16 Timing generation circuit 17 Sustain pulse generation unit 18 Drive circuit block 20 Chassis member 20a Chassis base unit 20b Reinforcement unit 20c First bent unit 20d First extending unit 20e 2nd bending part 20f 2nd extending part 20g 3rd bending part 20h 3rd extending part 20i 4th bending part 20j 4th extending part 21 Heat radiation sheet 22 Sealing material 23 Front cover 24 Back cover 24a Vent 25, 28

Flexible wiring Plate

26, 27, 30 Drive times Substrate 29 data driver 31 control circuit board 32 input signal circuit block 33 power supply block 34 front filter 23a opening 23b front frame 23c

decorative plate

36, 37, 38, 39 fixing member

Claims

A display panel comprising a front substrate and a rear substrate disposed opposite to the front substrate, wherein the outer peripheral portion of the front substrate and the outer peripheral portion of the rear substrate are bonded by a sealing material;
A chassis member having a chassis base portion holding the display panel on the front side;
The chassis member is separated from the display panel at a position outside the image display area of the display panel and inside the sealing material, and protrudes toward the back side and the front surface toward the outside with respect to the image display area. An image display device comprising a wave-shaped reinforcing portion that alternately repeats protrusion to the side.
The reinforcing portion includes a first bent portion obtained by bending the chassis member to the back side with respect to the chassis base portion at a position outside the image display area of the display panel and inside the sealing material. A first extending portion extending from the first bent portion toward the back surface; a second bent portion formed by bending the chassis member toward the front surface at the tip of the first extending portion; and a second extending portion extending from the second bent portion toward the front surface. , A third bent portion obtained by bending the chassis member to the back side at the tip of the second extended portion, a third extended portion extending from the third bent portion to the back side, and the tip of the third extended portion. The at least 4th bending part which bent the chassis member to the front side and the 4th extending | stretching part extended to the front side from the said 4th bending part are provided at least. Image display device.
A housing that houses the display panel and the chassis member;
The video display device according to claim 2, wherein the second and fourth bent portions of the reinforcing portion are fixed to the housing.
The display panel is a plasma display panel in which a discharge space is formed between the front substrate on which a plurality of display electrodes are arranged and the back substrate on which data electrodes are arranged so as to intersect the display electrodes. The video display device according to any one of claims 1 to 3.
The video display device according to claim 4, wherein a drive circuit block for driving the plasma display panel is disposed on a back side of the chassis member.