JP4552760B2 - Display device - Google Patents

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JP4552760B2
JP4552760B2 JP2005157463A JP2005157463A JP4552760B2 JP 4552760 B2 JP4552760 B2 JP 4552760B2 JP 2005157463 A JP2005157463 A JP 2005157463A JP 2005157463 A JP2005157463 A JP 2005157463A JP 4552760 B2 JP4552760 B2 JP 4552760B2
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heat
transfer sheet
case
heat transfer
liquid crystal
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JP2006330587A (en
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拡 柳瀬
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Nippon Seiki Co Ltd
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Nippon Seiki Co Ltd
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Description

本発明は、ケース内に収納され発熱部品を有する表示ユニットから発生する熱を外部に放散するための放熱部材および伝熱シートを備えた表示装置に関するものである。   The present invention relates to a display device including a heat radiating member and a heat transfer sheet for radiating heat generated from a display unit housed in a case and having a heat generating component to the outside.

ケース内に収納された液晶表示ユニットから発生する熱によって液晶表示素子の温度が上昇して表示が見にくくなるのを防ぐために、放熱板を用いてケース内の熱をケース外に放散するようにした表示装置として、例えば下記特許文献１が知られている。特許文献１に記載の液晶表示ユニット１は放熱板３０（放熱部材）を備えており、ケース２と一体形成され、かつケース２外に露出している下取付ボス２２に放熱板３０を接触させることによってケース２外に放熱するものである。また、放熱率を高めるために、シールドケース９と放熱板３０との間に放熱シート３１（伝熱シート）を介在させた点も示されている。
特開２００５−４９６０３号公報 In order to prevent the heat generated from the liquid crystal display unit housed in the case from raising the temperature of the liquid crystal display element and making the display difficult to see, the heat inside the case was dissipated outside the case using a heat sink. As a display device, for example, the following Patent Document 1 is known. The liquid crystal display unit 1 described in Patent Document 1 includes a heat radiating plate 30 (heat radiating member), and the heat radiating plate 30 is brought into contact with a lower mounting boss 22 that is integrally formed with the case 2 and exposed outside the case 2. By this, heat is radiated out of the case 2. Moreover, in order to raise a heat dissipation rate, the point which interposed the heat radiating sheet 31 (heat-transfer sheet | seat) between the shield case 9 and the heat sink 30 is also shown.
JP 2005-49603 A

上記特許文献１の表示装置に於いて、放熱率をより高めて視認性の良い表示装置を得るためには放熱シート３１（伝熱シート）を設けた方が望ましいが、放熱シート３１を放熱板３０（放熱部材）に貼り忘れる虞も有り得る。貼り忘れた場合、液晶表示ユニット１組み付け後は放熱シート３１の有無を確認することが困難である。また、放熱シート３１を放熱板３０に貼り付ける（装着する）際に位置ずれする可能性もある。放熱シート３１は発熱量の多い電子部品に対応した箇所に貼り付けた方が効果的であるが、貼付位置が大きくずれていると放熱の点から言って非効率的である。   In the display device of Patent Document 1, it is desirable to provide a heat dissipation sheet 31 (heat transfer sheet) in order to obtain a display device with higher visibility by increasing the heat dissipation rate. There is also a possibility of forgetting to stick to 30 (heat radiating member). If pasting is forgotten, it is difficult to confirm the presence or absence of the heat dissipation sheet 31 after the liquid crystal display unit 1 is assembled. Further, there is a possibility that the heat radiating sheet 31 is displaced when being attached (attached) to the heat radiating plate 30. It is more effective to attach the heat dissipation sheet 31 to a location corresponding to an electronic component that generates a large amount of heat. However, if the application position is greatly deviated, it is inefficient in terms of heat dissipation.

本発明はこの様な点に鑑みなされたもので、伝熱シートを放熱部材に装着する際の位置ずれを抑えると共に、伝熱シートの有無を容易に確認することができる表示装置を提供することを目的とする。   The present invention has been made in view of such a point, and provides a display device that can suppress misalignment when mounting a heat transfer sheet to a heat radiating member and can easily check the presence or absence of the heat transfer sheet. With the goal.

本発明は前記目的を達成するため、ケース内に収納され発熱部品を有する表示ユニットと、前記発熱部品から発生する熱を前記ケース外に放散させる放熱部材と、この放熱部材と前記発熱部品との間に装着された四角形の伝熱シートとを備え、この四角形の少なくとも対角に対応した前記放熱部材箇所には前記伝熱シートの角が見えるように対応して貫通部が設けられているものである。 In order to achieve the above object, the present invention provides a display unit housed in a case and having a heat generating component, a heat radiating member that dissipates heat generated from the heat generating component to the outside of the case, and the heat radiating member and the heat generating component. and a heat transfer sheet of the attached square while, those penetrating portion corresponding to the corner of the heat transfer sheet is visible is provided on the heat dissipation member position corresponding to at least the diagonal of this rectangle It is.

また、前記発熱部品に対応した前記放熱部材箇所に前記伝熱シートが装着されているものである。   Further, the heat transfer sheet is attached to the heat radiating member corresponding to the heat generating component.

また、前記発熱部品に前記伝熱シートが接触しているものである。   Further, the heat transfer sheet is in contact with the heat generating component.

伝熱シートを放熱部材に装着する際の位置ずれを抑えると共に、伝熱シートの有無を容易に確認することができる表示装置を得ることができる。   While suppressing the position shift at the time of mounting a heat-transfer sheet to a heat radiating member, the display apparatus which can confirm easily the presence or absence of a heat-transfer sheet can be obtained.

本発明を、車両用の液晶表示装置に適用した例を実施形態として説明する。図１は第１実施形態を示す液晶表示装置の断面図であり、図２は伝熱シートが装着された放熱部材の部分裏面図である。   An example in which the present invention is applied to a liquid crystal display device for a vehicle will be described as an embodiment. FIG. 1 is a cross-sectional view of the liquid crystal display device according to the first embodiment, and FIG. 2 is a partial rear view of a heat dissipation member to which a heat transfer sheet is attached.

液晶表示装置は、液晶表示ユニット１（表示ユニット）と、この液晶表示ユニット１が収納されるケース２を有しており、液晶表示ユニット１は、ＴＦＴ型と称される液晶表示素子３と、この液晶表示素子３を照明するバックライト装置４と、液晶表示素子３やバックライト装置４が保持される合成樹脂製のホルダ５と、ホルダ５に液晶表示素子３やバックライト装置４を固定しておく金属製の押え枠６と、ホルダ５の背後に配置された各電子部品７などが実装された回路基板８と、回路を電磁波などから保護する金属製のシールドケース９などを備えている。なお、回路基板８には各電子部品７の中でも発熱量が特に多いトランスやＩＣなどの発熱部品７Ａも実装されている。   The liquid crystal display device includes a liquid crystal display unit 1 (display unit) and a case 2 in which the liquid crystal display unit 1 is housed. The liquid crystal display unit 1 includes a liquid crystal display element 3 called a TFT type, The backlight device 4 that illuminates the liquid crystal display element 3, the synthetic resin holder 5 that holds the liquid crystal display element 3 and the backlight device 4, and the liquid crystal display element 3 and the backlight device 4 are fixed to the holder 5. A metal holding frame 6 to be kept, a circuit board 8 on which each electronic component 7 arranged behind the holder 5 is mounted, a metal shield case 9 for protecting the circuit from electromagnetic waves and the like are provided. . The circuit board 8 is also mounted with a heat generating component 7A such as a transformer or an IC that generates a large amount of heat among the electronic components 7.

バックライト装置４は、光源としての冷陰極管１０と、端面から内部に入射した冷陰極管１０からの光を液晶表示素子３の裏面側に導く無色透明の導光部材１１と、この導光部材１１の背後に配置された反射板１２と、液晶表示素子３と導光部材１１との間に配置された拡散シートやプリズムシートなどの光学シート１３からなる。このバックライト装置４により液晶表示素子３を背後から照明して、表示（例えば車両用の液晶表示装置の場合は、車両速度，燃料残量，温度，メッセージなど）が良好に視認されるようにしてある。   The backlight device 4 includes a cold-cathode tube 10 as a light source, a colorless and transparent light guide member 11 that guides light from the cold-cathode tube 10 incident inside from the end face to the back side of the liquid crystal display element 3, and the light guide. It consists of a reflection plate 12 disposed behind the member 11 and an optical sheet 13 such as a diffusion sheet or a prism sheet disposed between the liquid crystal display element 3 and the light guide member 11. The backlight device 4 illuminates the liquid crystal display element 3 from behind so that the display (for example, in the case of a liquid crystal display device for a vehicle, vehicle speed, fuel remaining amount, temperature, message, etc.) can be seen well. It is.

また、液晶表示ユニット１には、硬質のメーン基板１４と、合成樹脂製の枠体１５が備えられている。前述した各部品が枠体１５内に収納され、詳細は図示しないが、メーン基板１４を枠体１５に固定することによってユニット化されている。メーン基板１４にも液晶表示装置の電源回路用や液晶表示素子３に表示データを送る回路用の電子部品７などが実装されている。   Further, the liquid crystal display unit 1 includes a hard main substrate 14 and a synthetic resin frame 15. Each component described above is housed in the frame 15, and although not shown in detail, it is unitized by fixing the main board 14 to the frame 15. The main board 14 is also mounted with an electronic component 7 for a power supply circuit of the liquid crystal display device and a circuit for sending display data to the liquid crystal display element 3.

ケース２は分割された上ケース２Ａと下ケース２Ｂで構成されており、上ケース２Ａは無色透明な合成樹脂からなる窓部１６と、不透過性（例えば黒色）の合成樹脂からなる覆い部１７とが一体形成されたものである。覆い部１７は前部１８と側部１９とからなる。また、上ケース２Ａの前部１８には略円柱状の上取付ボス２０が一体に設けられている。   The case 2 is composed of a divided upper case 2A and lower case 2B. The upper case 2A has a window portion 16 made of a colorless and transparent synthetic resin and a cover portion 17 made of an impermeable (for example, black) synthetic resin. Are integrally formed. The cover part 17 includes a front part 18 and a side part 19. A substantially cylindrical upper mounting boss 20 is integrally provided on the front portion 18 of the upper case 2A.

下ケース２Ｂは上ケース２Ａと同様に不透過性の合成樹脂からなり、底部２１と側部１９Ａを有する。また、下ケース２Ｂには上ケース２Ａに設けられた上取付ボス２０に対応して下ケース２Ｂ用の下取付ボス２２が下ケース２Ｂと一体形成されている。この下取付ボス２２は、熱伝導性の良い材料であるアルミニウムあるいは銅などからなり、底部２１側が開口された略円筒状となっている。   The lower case 2B is made of an impermeable synthetic resin like the upper case 2A, and has a bottom portion 21 and a side portion 19A. Further, a lower mounting boss 22 for the lower case 2B is integrally formed with the lower case 2B corresponding to the upper mounting boss 20 provided on the upper case 2A. The lower mounting boss 22 is made of aluminum or copper, which is a material having good thermal conductivity, and has a substantially cylindrical shape with an opening on the bottom 21 side.

また、液晶表示ユニット１には、熱伝導性の良い金属材料である例えばアルミニウム製の放熱部材２３がシールドケース９を含む回路基板８のほぼ全面を被うように配置してある。この放熱部材２３は、上ケース２Ａに設けられた上取付ボス２０に対応して固定部２４が延設してあり、固定部２４と枠体１５の鍔部２５とが上ケース２Ａの上取付ボス２０と下ケース２Ｂの下取付ボス２２との間にビス２６で締付固定されている。   Further, in the liquid crystal display unit 1, a heat radiating member 23 made of, for example, aluminum having a good thermal conductivity is arranged so as to cover almost the entire surface of the circuit board 8 including the shield case 9. The heat dissipating member 23 has a fixing portion 24 extending corresponding to the upper mounting boss 20 provided on the upper case 2A, and the fixing portion 24 and the flange portion 25 of the frame body 15 are mounted on the upper case 2A. Fastened with screws 26 between the boss 20 and the lower mounting boss 22 of the lower case 2B.

また、回路基板８に実装されている発熱部品７Ａに対応した放熱部材２３箇所には、熱伝導性の良い例えばシリコーンゴムからなる伝熱シート２７が装着してある。本実施形態に於ける伝熱シート２７は四角形であり、放熱部材２３に貼り付けてあると共に、反対側の面はシールドケース９に接触している。図２に示す様に、この伝熱シート２７の対角に対応した放熱部材２３箇所には貫通部２８としての穴が設けてあり、放熱部材２３の裏面側（下ケース２Ｂの底部２１側）から見た際、伝熱シート２７の角が見えるようになっている（図２に於いて、斜線部が見える部分）。なお、貫通部２８は少なくとも対角にあるのが望ましく、３箇所あるいは全ての角に対応した箇所に設けてあっても良い。   In addition, a heat transfer sheet 27 made of, for example, silicone rubber having good heat conductivity is attached to the 23 heat dissipating members corresponding to the heat generating component 7A mounted on the circuit board 8. The heat transfer sheet 27 in the present embodiment is rectangular and is attached to the heat radiating member 23, and the opposite surface is in contact with the shield case 9. As shown in FIG. 2, holes as through portions 28 are provided in the heat radiation member 23 corresponding to the diagonal of the heat transfer sheet 27, and the back surface side of the heat radiation member 23 (the bottom 21 side of the lower case 2 </ b> B). When viewed from above, the corners of the heat transfer sheet 27 are visible (the portion where the hatched portion is visible in FIG. 2). In addition, it is desirable that the through portion 28 is at least diagonal, and may be provided at three locations or locations corresponding to all corners.

ケース２内の放熱は次の通りに行われる。発熱部品７Ａなどから発せられた熱はシールドケース９に伝わる。シールドケース９には伝熱シート２７が接触しているため、シールドケース９の熱は伝熱シート２７を介して放熱部材２３に伝わる。そして、放熱部材２３の固定部２４から下ケース２Ｂの下取付ボス２２へと伝わりケース２外に放散される。また、発熱部品７Ａなどから発せられ空気を介して放熱部材２３に伝わった熱も下取付ボス２２へと伝わりケース２外に放散されるようになる。   Heat dissipation in case 2 is performed as follows. Heat generated from the heat generating component 7 </ b> A is transmitted to the shield case 9. Since the heat transfer sheet 27 is in contact with the shield case 9, the heat of the shield case 9 is transmitted to the heat radiating member 23 through the heat transfer sheet 27. Then, the heat is transmitted from the fixing portion 24 of the heat radiating member 23 to the lower mounting boss 22 of the lower case 2 </ b> B and diffused out of the case 2. Further, the heat generated from the heat generating component 7A and the like and transmitted to the heat radiating member 23 through the air is also transmitted to the lower mounting boss 22 to be dissipated out of the case 2.

以上の様に、伝熱シート２７に対応した放熱部材２３箇所に貫通部２８を設けたことにより、貫通部２８が伝熱シート２７を放熱部材２３に貼る際の目印となる。しかも伝熱シート２７が四角形であり、その四角形の対角に対応した箇所に貫通部２８が設けてあるため、放熱部材２３に伝熱シート２７を貼る際、左右，前後，斜めのいずれの方向であっても貼付位置のずれを極力抑えることができる。また、発熱部品７Ａに対応した放熱部材２３箇所に伝熱シート２７を貼り付けることによって、発熱部品７Ａに対する伝熱シート２７の位置ずれも抑えられ、最も温度の上昇しやすいシールドケース９箇所の熱をケース２外に放散させることができる。   As described above, by providing the through portions 28 at the 23 heat dissipating member portions corresponding to the heat transfer sheet 27, the through portions 28 serve as marks when the heat transfer sheet 27 is attached to the heat dissipating member 23. Moreover, since the heat transfer sheet 27 has a quadrangular shape and the penetrating portion 28 is provided at a location corresponding to the diagonal of the quadrangle, when the heat transfer sheet 27 is pasted on the heat radiating member 23, any of the left, right, front, back, and diagonal directions Even so, it is possible to suppress the displacement of the attaching position as much as possible. Further, by sticking the heat transfer sheet 27 to 23 heat dissipating members corresponding to the heat generating component 7A, the heat transfer sheet 27 is prevented from being displaced with respect to the heat generating component 7A, and the heat of the shield case 9 where temperature rises most easily is suppressed. Can be diffused out of the case 2.

また、伝熱シート２７に対応した放熱部材２３箇所に貫通部２８が設けてあるため、放熱部材２３を組み付けた後であっても放熱部材２３の裏面側から伝熱シート２７の有無を確認できる。この様に、放熱部材２３に穴を開けるだけの簡単な方法で伝熱シート２７の貼付位置のずれや貼り忘れを防ぐことができ、液晶表示素子３の温度上昇を抑えて視認性の良い表示装置を得ることが可能となる。   Moreover, since the penetration part 28 is provided in the heat dissipation member 23 location corresponding to the heat transfer sheet 27, even after the heat dissipation member 23 is assembled, the presence or absence of the heat transfer sheet 27 can be confirmed from the back side of the heat dissipation member 23. . In this way, it is possible to prevent the heat transfer sheet 27 from being misplaced or forgotten to be pasted by a simple method by simply making a hole in the heat radiating member 23, and the temperature rise of the liquid crystal display element 3 can be suppressed and display with good visibility. An apparatus can be obtained.

なお、前記実施形態において、伝熱シート２７を発熱部品７Ａに対応した放熱部材２３箇所に設けたが、対応していなくとも（真下でなくとも）良い。また、放熱部材２３に設ける貫通部２８は伝熱シート２７の存在を目視などによって確認できる貫通部分であれば良く、その形状，個数は任意である。また、ケース２内に液晶表示ユニット１が収納されている液晶表示装置を実施形態として示したが、ケース２内には液晶表示ユニット１の他にアナログ式の速度計や回転計などが収納されていても良く、液晶以外の表示素子、例えば蛍光表示管を用いても良い。   In the above-described embodiment, the heat transfer sheet 27 is provided at the 23 heat dissipating members corresponding to the heat generating component 7A. However, the heat transfer sheet 27 may not be supported (not directly below). Moreover, the penetration part 28 provided in the heat radiating member 23 should just be a penetration part which can confirm presence of the heat-transfer sheet | seat 27 by visual observation etc., The shape and number are arbitrary. Further, the liquid crystal display device in which the liquid crystal display unit 1 is accommodated in the case 2 has been described as an embodiment. However, in the case 2, an analog speedometer, tachometer, and the like are accommodated in addition to the liquid crystal display unit 1. A display element other than liquid crystal, for example, a fluorescent display tube may be used.

図３は、本発明の第２実施形態を示し、伝熱シート２７が装着された放熱部材２３の部分裏面図である。前記第１実施形態とは放熱部材２３に設けた貫通部２８の形状が異なる。また、図示しないがシールドケースが使われていなく、伝熱シート２７が発熱部品（図１に於ける７Ａ）と接触するようになっている。   FIG. 3 shows a second embodiment of the present invention and is a partial rear view of the heat dissipation member 23 to which the heat transfer sheet 27 is attached. The shape of the penetration part 28 provided in the heat radiating member 23 is different from the first embodiment. Although not shown, a shield case is not used, and the heat transfer sheet 27 comes into contact with the heat generating component (7A in FIG. 1).

伝熱シート２７に対応した放熱部材２３箇所には略長楕円状の貫通部２８が設けてあり、放熱部材２３の裏面側から見た際、伝熱シート２７の一部が見えるようになっている（図３に於いて、斜線部が見える部分）。   23 portions of the heat dissipating member corresponding to the heat transfer sheet 27 are provided with substantially elliptical through portions 28, and a part of the heat transfer sheet 27 can be seen when viewed from the back side of the heat dissipating member 23. (In FIG. 3, the shaded portion is visible).

この様に構成したことにより、貫通部２８が伝熱シート２７を放熱部材２３に貼る際の目印となって、伝熱シート２７の貼付位置のずれを抑えることができると共に、放熱部材２３を組み付けた後であっても伝熱シート２７の有無を確認でき、伝熱シート２７の貼り忘れを防ぐことができる。なお、シールドケースが無いため、発熱部品などから発せられた熱は伝熱シート２７を介して放熱部材２３に伝わりケース２外に放散されるようになる。   With this configuration, the through portion 28 serves as a mark when the heat transfer sheet 27 is attached to the heat radiating member 23, so that the shift of the application position of the heat transfer sheet 27 can be suppressed and the heat radiating member 23 is assembled. Even after the heat transfer sheet 27 can be confirmed, it is possible to prevent the heat transfer sheet 27 from being forgotten. In addition, since there is no shield case, the heat generated from the heat-generating component or the like is transmitted to the heat radiating member 23 via the heat transfer sheet 27 and dissipated out of the case 2.

本発明の第１実施形態を示す液晶表示装置の断面図。1 is a cross-sectional view of a liquid crystal display device showing a first embodiment of the present invention. 同第１実施形態を示し、伝熱シートが装着された放熱部材の部分裏面図。The partial back view of the heat radiating member which showed the said 1st Embodiment and was equipped with the heat-transfer sheet | seat. 本発明の第２実施形態を示し、伝熱シートが装着された放熱部材の部分裏面図。The partial back view of the thermal radiation member which showed 2nd Embodiment of this invention and to which the heat-transfer sheet | seat was mounted | worn.

符号の説明Explanation of symbols

１ 液晶表示ユニット（表示ユニット）
２ ケース
２Ａ 上ケース
２Ｂ 下ケース
７Ａ 発熱部品（電子部品）
２３ 放熱部材
２７ 伝熱シート
２８ 貫通部 1 Liquid crystal display unit (display unit)
2 Case 2A Upper case 2B Lower case 7A Heating component (electronic component)
23 Heat radiating member 27 Heat transfer sheet 28 Penetration part

Claims (3)

ケース内に収納され発熱部品を有する表示ユニットと、前記発熱部品から発生する熱を前記ケース外に放散させる放熱部材と、この放熱部材と前記発熱部品との間に装着された四角形の伝熱シートとを備え、この四角形の少なくとも対角に対応した前記放熱部材箇所には前記伝熱シートの角が見えるように対応して貫通部が設けられていることを特徴とする表示装置。 A display unit housed in a case and having a heat generating component, a heat radiating member for radiating heat generated from the heat generating component to the outside of the case, and a rectangular heat transfer sheet mounted between the heat radiating member and the heat generating component preparative comprising a display device, characterized in that the through portions are provided corresponding to the corners of the heat transfer sheet is visible to the heat dissipation member position corresponding to at least the diagonal of this rectangle. 前記発熱部品に対応した前記放熱部材箇所に前記伝熱シートが装着されていることを特徴とする請求項１に記載の表示装置。 The display device according to claim 1, wherein the heat transfer sheet is attached to the heat radiating member portion corresponding to the heat generating component. 前記発熱部品に前記伝熱シートが接触していることを特徴とする請求項２に記載の表示装置。 The display device according to claim 2, wherein the heat transfer sheet is in contact with the heat generating component.
JP2005157463A 2005-05-30 2005-05-30 Display device Active JP4552760B2 (en)

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JP2011077578A (en) * 2009-09-29 2011-04-14 Mitsumi Electric Co Ltd Tuner module
JP2014092699A (en) * 2012-11-05 2014-05-19 Sharp Corp Liquid crystal display device
JP2014092700A (en) * 2012-11-05 2014-05-19 Sharp Corp Liquid crystal display device
JP6300023B2 (en) * 2014-07-16 2018-03-28 日本精機株式会社 Lighting device
JP6471590B2 (en) * 2015-04-06 2019-02-20 三菱電機株式会社 Display device

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JPH1165485A (en) * 1997-08-18 1999-03-05 Matsushita Electric Ind Co Ltd Video display device
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JP2006058486A (en) * 2004-08-18 2006-03-02 Sony Corp Heatsink and display device

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JPH1165485A (en) * 1997-08-18 1999-03-05 Matsushita Electric Ind Co Ltd Video display device
JP2001022280A (en) * 1999-07-09 2001-01-26 Matsushita Electric Ind Co Ltd Plasma display device
JP2002099218A (en) * 2000-09-22 2002-04-05 Nec Corp Plasma display panel device having reinforcing plate
JP2005049603A (en) * 2003-07-29 2005-02-24 Nippon Seiki Co Ltd Display apparatus
JP2006058486A (en) * 2004-08-18 2006-03-02 Sony Corp Heatsink and display device

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