JPH0792450A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH0792450A JPH0792450A JP23956193A JP23956193A JPH0792450A JP H0792450 A JPH0792450 A JP H0792450A JP 23956193 A JP23956193 A JP 23956193A JP 23956193 A JP23956193 A JP 23956193A JP H0792450 A JPH0792450 A JP H0792450A
- Authority
- JP
- Japan
- Prior art keywords
- circuit board
- liquid crystal
- display device
- crystal display
- display panel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は液晶表示装置内における
不要輻射の電磁波に対する漏洩防止構造に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing leakage of unwanted electromagnetic waves in a liquid crystal display device.
【0002】[0002]
【従来の技術】表示装置として使われている液晶表示装
置は情報処理装置の一つとして使われているが、情報処
理装置等電波障害自主規制協議会(VCCI)、連邦通
信委員会規則(FCC)などが定めている不要輻射規制
の対象になっている。図5は従来の液晶表示装置を示す
概略平面図、図6は図5に示す液晶表示装置のA−A´
線の断面図、図7は図5に示す液晶表示装置のB−B´
線の断面図、図8は図1に示す液晶表示装置と図5に示
す液晶表示装置の不要輻射の近磁界強度のデータを示
す。従来は液晶表示装置の表示パネル3の周辺にあるソ
ース回路基板4及びゲート回路基板5には数10MHz
という高周波の映像信号が入力されており、前記映像信
号を増幅回路に入力するには不要輻射の電磁波Dが強い
のでフィルターを使用して、不要輻射の電磁波Dを除去
したり、また増幅回路の不要輻射の電磁波Dの漏洩を抑
制するために、液晶表示装置本体を金属ケース2で覆う
シールドを取り付けて、さらにソース回路基板4及びゲ
ート回路基板5のクロック信号ライン、映像信号ライン
等の高周波電流が流れる信号ラインに回路基板のグラン
ド電位を使って上下をグランド電位に多層化して不要輻
射の電磁波Dの漏れを防止していた。2. Description of the Related Art A liquid crystal display device used as a display device is used as one of information processing devices. However, the information processing devices such as the Voluntary Control Council for Radio Interference (VCCI) and the Federal Communications Commission Regulations (FCC) ) Are subject to the regulation of unwanted radiation. FIG. 5 is a schematic plan view showing a conventional liquid crystal display device, and FIG. 6 is an AA ′ of the liquid crystal display device shown in FIG.
7 is a sectional view of the liquid crystal display device shown in FIG.
8 is a cross-sectional view of the line, and FIG. 8 shows the near-field strength data of unnecessary radiation of the liquid crystal display device shown in FIG. 1 and the liquid crystal display device shown in FIG. Conventionally, the source circuit board 4 and the gate circuit board 5 around the display panel 3 of the liquid crystal display device have several tens of MHz.
The high-frequency video signal is input, and the electromagnetic wave D of the unwanted radiation is strong in order to input the video signal to the amplification circuit. Therefore, a filter is used to remove the unwanted radiation electromagnetic wave D or the amplification circuit. In order to suppress the leakage of the electromagnetic wave D of unnecessary radiation, a shield for covering the liquid crystal display device body with the metal case 2 is attached, and further high-frequency currents such as clock signal lines and video signal lines of the source circuit board 4 and the gate circuit board 5 are attached. The ground potential of the circuit board is used for the signal line through which the current flows and the upper and lower sides are multilayered to the ground potential to prevent leakage of the electromagnetic wave D of unnecessary radiation.
【0003】[0003]
【発明が解決しようとする課題】しかし数10MHzと
いう高周波の映像信号で動作をする液晶表示装置に対
し、従来のように不要輻射の電磁波が強い信号ラインに
フィルターを使用して、また液晶表示装置本体を金属ケ
ースで覆うシールドを取り付けて、さらに高周波電流が
流れる信号ラインに回路基板のグランド電位を使って上
下をグランド電位に多層化するなどの技術手法を用いて
も、ソース回路基板及びゲート回路基板からの不要輻射
の電磁波が金属ケースと表示パネルの間から漏洩するの
を完全に防ぐことは問題であり、他の機器などに誤動作
等の悪影響を及ぼしていた。液晶表示装置のソース回路
基板及びゲート回路基板を25MHzの基本周波数で駆
動すると数倍(25×N)の高調波が放出されており、
図8に示すデータは高調波が200MHz(基本周波数
の8倍)放出された時の、従来の液晶表示装置Bの表示
パネル内部間の距離lを左下隅から右下隅へX方向に2
cm毎に測定した不要輻射の近磁界強度のデータを表し
ている。従来の液晶表示装置Bによる不要輻射の近磁界
強度のデータを見ても分かるように不要輻射の電磁波の
漏洩を完全に防止することは困難であるというのが実状
であった。このように液晶表示装置が数10MHzとい
う高周波の映像信号で動作していることに起因する不要
輻射の電磁波の漏洩が他の機器へ及ぼす影響が従来より
問題となっている。However, in contrast to a liquid crystal display device which operates with a high frequency video signal of several tens of MHz, a filter is used for a signal line where electromagnetic waves of unwanted radiation are strong as in the conventional case, and the liquid crystal display device is also used. Even if you use a technique such as attaching a shield that covers the main body with a metal case and using the ground potential of the circuit board for the signal line through which the high-frequency current flows so that the top and bottom layers are multilayered to the ground potential, the source circuit board and gate circuit It is a problem to completely prevent the electromagnetic waves of unwanted radiation from the substrate from leaking from between the metal case and the display panel, which adversely affects other devices such as malfunction. When the source circuit board and the gate circuit board of the liquid crystal display device are driven at a fundamental frequency of 25 MHz, several times (25 × N) higher harmonics are emitted,
The data shown in FIG. 8 shows that the distance l between the interiors of the display panels of the conventional liquid crystal display B when the harmonic is emitted at 200 MHz (8 times the fundamental frequency) is 2 in the X direction from the lower left corner to the lower right corner.
The data of the near magnetic field intensity of unnecessary radiation measured for each cm is shown. As can be seen from the data of the near-field strength of unwanted radiation by the conventional liquid crystal display device B, it is difficult to completely prevent the leakage of electromagnetic waves of unwanted radiation. As described above, the influence of leakage of electromagnetic waves of unnecessary radiation on other devices due to the liquid crystal display device operating with a high-frequency video signal of several tens of MHz has been a problem in the past.
【0004】本発明はこのような問題を解消するもので
あって、その目的は液晶表示装置に数10MHzという
高周波の映像信号が入力されても、不要輻射の電磁波が
漏洩し難い液晶表示装置を提供することである。The present invention solves such a problem, and an object thereof is to provide a liquid crystal display device in which unnecessary radiation of electromagnetic waves does not easily leak even when a high-frequency video signal of several tens of MHz is input to the liquid crystal display device. Is to provide.
【0005】[0005]
【課題を解決するための手段】請求項1に記載している
本発明は、表示パネルの周辺に該表示パネルを表示させ
る回路基板が接続され、該回路基板の外部周辺には液晶
表示装置本体のカバーとなる金属ケースが装着されてい
る液晶表示装置において、前記金属ケースと前記回路基
板との間の前記表示パネル周辺にフエライトが装着され
ている液晶表示装置である。According to a first aspect of the present invention, a circuit board for displaying the display panel is connected to the periphery of the display panel, and a liquid crystal display device main body is provided outside the circuit board. In the liquid crystal display device in which a metal case serving as a cover is attached, a ferrite is attached around the display panel between the metal case and the circuit board.
【0006】請求項2に記載している本発明は、請求項
1に記載している前記フエライトが前記金属ケースと前
記回路基板との間に挟まれて前記表示パネル周辺の4隅
部に装着されている事である。According to a second aspect of the present invention, the ferrite according to the first aspect is sandwiched between the metal case and the circuit board and mounted at four corners around the display panel. It has been done.
【0007】請求項3に記載している本発明は、請求項
1に記載している前記フエライトが前記金属ケースと前
記回路基板との間に挟まれて前記表示パネル周辺を囲ん
で装着されている事である。According to a third aspect of the present invention, the ferrite according to the first aspect is mounted between the metal case and the circuit board so as to surround the display panel. Is to be.
【0008】[0008]
【作用】液晶表示装置本体内の表示パネル周辺にある金
属ケースとソース回路基板及びゲート回路基板との間の
前記表示パネル周辺にフエライトが装着されているの
で、前記フエライトが不要輻射の電磁波の磁気成分を吸
収し、熱に変えて放出するので不要輻射の電磁波の漏洩
が抑制される。Since the ferrite is mounted around the display panel between the metal case and the source circuit board and the gate circuit board around the display panel in the main body of the liquid crystal display device, the ferrite is attached to the periphery of the display panel. Since the components are absorbed and are converted into heat and emitted, leakage of electromagnetic waves of unnecessary radiation is suppressed.
【0009】[0009]
【実施例】以下、本発明の実施例を図面に基づいて詳細
に説明する。Embodiments of the present invention will now be described in detail with reference to the drawings.
【0010】図1は本実施例の液晶表示装置に係るフエ
ライト1を表示パネル3に装着した状態を示すの概略平
面図、図2は図1に示す液晶表示装置のA−A´線によ
る断面図、図3は図1に示す液晶表示装置のB−B´線
による断面図、図4は本発明の液晶表示装置の他の実施
例を示す概略平面図である。FIG. 1 is a schematic plan view showing a state in which a ferrite 1 according to the liquid crystal display device of this embodiment is mounted on a display panel 3, and FIG. 2 is a cross section taken along the line AA 'of the liquid crystal display device shown in FIG. 3 is a sectional view taken along line BB ′ of the liquid crystal display device shown in FIG. 1, and FIG. 4 is a schematic plan view showing another embodiment of the liquid crystal display device of the present invention.
【0011】本実施例の液晶表示装置を平面方向から見
ると、表示パネル3の周辺は液晶表示装置を駆動させる
ためのソース回路基板4及びゲート回路基板5が装着さ
れており、該ソース回路基板4及び該ゲート回路基板5
の外部周辺は液晶表示装置本体のカバーとなる金属ケー
ス2で覆われており、さらに表示パネル3の周辺にはフ
エライト1が周設されている。また液晶表示装置をA−
A´線による断面で見ると、フエライト1は金属ケース
2とソース回路基板4及びゲート回路基板5との間に挟
まれて表示パネル3に周設されている。液晶表示装置を
B−B´線による断面で見た場合も同様である。When the liquid crystal display device of this embodiment is viewed from the plane, a source circuit board 4 and a gate circuit board 5 for driving the liquid crystal display device are mounted around the display panel 3, and the source circuit board is mounted. 4 and the gate circuit board 5
The outer periphery is covered with a metal case 2 which serves as a cover of the liquid crystal display device main body, and a periphery of the display panel 3 is surrounded by a ferrite 1. In addition, the liquid crystal display device is
When viewed in a cross section taken along the line A ′, the ferrite 1 is provided around the display panel 3 while being sandwiched between the metal case 2 and the source circuit board 4 and the gate circuit board 5. The same is true when the liquid crystal display device is viewed in a cross section taken along the line BB '.
【0012】以上のように構成された液晶表示装置につ
いての動作を説明する。The operation of the liquid crystal display device configured as described above will be described.
【0013】本実施例は液晶表示装置内部のソース回路
基板4及びゲート回路基板5から発生する不要輻射の電
磁波Dが外部に漏れないようにするために、表示パネル
3の周辺をフエライト1で周設し、金属ケース2とソー
ス回路基板4及びゲート回路基板5で挟んで密閉してい
る。このフエライト1が不要輻射の電磁波Dの磁気成分
を吸収し、熱に変えて放出する機能を有る。液晶表示装
置のソース回路基板4及びゲート回路基板5を25MH
zの基本周波数で駆動すると数倍(25×N)の高調波
が放出されており、図8に示すデータは高調波が200
MHz(基本周波数の8倍)放出された時の、本実施例
の液晶表示装置Aの表示パネル内部間の距離lを左下隅
から右下隅へX方向に2cm毎に測定した不要輻射の近
磁界強度のデータを表している。図8に示す本実施例の
液晶表示装置のデータAと従来の液晶表示装置のデータ
Bを比較して分かるように本実施例の液晶表示装置はフ
エライト1が不要輻射の電磁波Dの磁気成分を吸収し、
熱に変えて放出しているので液晶表示装置本体から不要
輻射の電磁波Dが漏洩することはない。図4は他の実施
例を示しており、ソース回路基板4及びゲート回路基板
5を低周波数で駆動する場合には表示パネル3の周辺の
4隅部にフエライト1を配置しても同様の効果が得られ
る。In this embodiment, in order to prevent the electromagnetic waves D of unnecessary radiation generated from the source circuit board 4 and the gate circuit board 5 inside the liquid crystal display device from leaking to the outside, the periphery of the display panel 3 is surrounded by the ferrite 1. The metal case 2 and the source circuit board 4 and the gate circuit board 5 are sandwiched and hermetically sealed. This ferrite 1 has a function of absorbing the magnetic component of the electromagnetic wave D of unnecessary radiation, converting it into heat, and releasing it. The source circuit board 4 and the gate circuit board 5 of the liquid crystal display device are set to 25 MHz.
When driven at the fundamental frequency of z, several times (25 × N) higher harmonics are emitted, and the data shown in FIG.
A near magnetic field of unnecessary radiation measured at intervals of 2 cm in the X direction from the lower left corner to the lower right corner of the distance l between the interiors of the display panels of the liquid crystal display device A of the present embodiment when emitted at MHz (8 times the fundamental frequency). Represents intensity data. As can be seen by comparing the data A of the liquid crystal display device of the present embodiment shown in FIG. 8 with the data B of the conventional liquid crystal display device, in the liquid crystal display device of the present embodiment, the ferrite 1 causes the magnetic component of the electromagnetic wave D of unnecessary radiation. Absorb,
Since the heat is emitted instead of heat, the electromagnetic wave D of unnecessary radiation does not leak from the liquid crystal display device body. FIG. 4 shows another embodiment. When the source circuit board 4 and the gate circuit board 5 are driven at a low frequency, the same effect can be obtained by arranging the ferrites 1 at the four corners around the display panel 3. Is obtained.
【0014】[0014]
【発明の効果】以上の説明から明らかな通り、本発明は
表示パネルの周辺に該表示パネルを表示させる回路基板
が接続され、該回路基板の外部周辺には液晶表示装置本
体のカバーとなる金属ケースが装着されており、前記金
属ケースと前記回路基板との間の前記表示パネル周辺に
フエライトが装着されているので、フエライトが不要輻
射の電磁波の磁気成分を吸収し、熱に変えて放出するこ
とにより不要輻射の電磁波の漏洩を抑えることができ
る。従って他の機器などに誤動作の悪影響を及ぼすこと
がなくなり、またVCCIやFCCが定めている不要輻
射規制に対する問題も十分にクリアすることができる。As is apparent from the above description, according to the present invention, a circuit board for displaying the display panel is connected to the periphery of the display panel, and a metal serving as a cover of the liquid crystal display device main body is provided outside the circuit board. Since the case is mounted and the ferrite is mounted around the display panel between the metal case and the circuit board, the ferrite absorbs the magnetic component of the electromagnetic wave of unnecessary radiation, converts it into heat and emits it. As a result, the leakage of electromagnetic waves of unnecessary radiation can be suppressed. Therefore, it is possible to prevent other devices and the like from being adversely affected by the malfunction, and it is possible to sufficiently solve the problem of unnecessary radiation regulation defined by VCCI and FCC.
【図1】本発明の1実施例を示す液晶表示装置の概略平
面図である。FIG. 1 is a schematic plan view of a liquid crystal display device showing an embodiment of the present invention.
【図2】図1に示す液晶表示装置のA−A´の断面図で
ある。FIG. 2 is a cross-sectional view taken along the line AA ′ of the liquid crystal display device shown in FIG.
【図3】図1に示す液晶表示装置のB−B´の断面図で
ある。FIG. 3 is a cross-sectional view taken along the line BB ′ of the liquid crystal display device shown in FIG.
【図4】本発明の他の実施例を示す液晶表示装置の概略
平面図である。FIG. 4 is a schematic plan view of a liquid crystal display device showing another embodiment of the present invention.
【図5】従来の液晶表示装置を示す概略平面図である。FIG. 5 is a schematic plan view showing a conventional liquid crystal display device.
【図6】図5に示す液晶表示装置のA−A´の断面図で
ある。6 is a cross-sectional view taken along the line AA ′ of the liquid crystal display device shown in FIG.
【図7】図5に示す液晶表示装置のB−B´の断面図で
ある。7 is a cross-sectional view taken along the line BB ′ of the liquid crystal display device shown in FIG.
【図8】図1に示す液晶表示装置と図5に示す液晶表示
装置の液晶表示装置における不要輻射の近磁界強度のデ
ータを示す図。8 is a diagram showing data of near-field strength of unnecessary radiation in the liquid crystal display device of the liquid crystal display device shown in FIG. 1 and the liquid crystal display device of FIG.
1.フエライト 2.金属ケース 3.表示パネル 4.ソース回路基板 5.ゲート回路基板 6.ベースプレート 7.拡散板 8.バックライト用ケース 1. Ferrite 2. Metal case 3. Display panel 4. Source circuit board 5. Gate circuit board 6. Base plate 7. Diffuser 8. Backlight case
Claims (3)
せる回路基板が接続され、該回路基板の外部周辺には液
晶表示装置本体のカバーとなる金属ケースが装着されて
いる液晶表示装置において、前記金属ケースと前記回路
基板との間の前記表示パネル周辺にフエライトが装着さ
れていることを特徴とする液晶表示装置。1. A liquid crystal display device in which a circuit board for displaying the display panel is connected to the periphery of the display panel, and a metal case serving as a cover of the liquid crystal display device body is attached to the outer periphery of the circuit board. A liquid crystal display device, wherein a ferrite is mounted around the display panel between the metal case and the circuit board.
路基板との間に挟まれて前記表示パネル周辺の4隅部に
装着されている請求項1に記載の液晶表示装置。2. The liquid crystal display device according to claim 1, wherein the ferrite is sandwiched between the metal case and the circuit board and mounted at four corners around the display panel.
路基板との間に挟まれて前記表示パネル周辺を囲んで装
着されている請求項1に記載の液晶表示装置。3. The liquid crystal display device according to claim 1, wherein the ferrite is mounted between the metal case and the circuit board so as to surround the periphery of the display panel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23956193A JPH0792450A (en) | 1993-09-27 | 1993-09-27 | Liquid crystal display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23956193A JPH0792450A (en) | 1993-09-27 | 1993-09-27 | Liquid crystal display device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0792450A true JPH0792450A (en) | 1995-04-07 |
Family
ID=17046637
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23956193A Pending JPH0792450A (en) | 1993-09-27 | 1993-09-27 | Liquid crystal display device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0792450A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7184117B2 (en) | 2003-07-31 | 2007-02-27 | Denso Corporation | Display panel having noise shielding structure |
-
1993
- 1993-09-27 JP JP23956193A patent/JPH0792450A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7184117B2 (en) | 2003-07-31 | 2007-02-27 | Denso Corporation | Display panel having noise shielding structure |
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