JPH05273547A - Liquid crystal display device and electronic equipment - Google Patents
Liquid crystal display device and electronic equipmentInfo
- Publication number
- JPH05273547A JPH05273547A JP4067009A JP6700992A JPH05273547A JP H05273547 A JPH05273547 A JP H05273547A JP 4067009 A JP4067009 A JP 4067009A JP 6700992 A JP6700992 A JP 6700992A JP H05273547 A JPH05273547 A JP H05273547A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- display device
- electronic equipment
- display element
- 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およびそれ
を用いた電子機器の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 liquid crystal display device and a structure of electronic equipment using the same.
【０００２】[0002]
【従来の技術】従来の液晶表示装置では、反射型液晶表
示素子を有する場合には該液晶表示素子の反射板は電気
的に接地もしくはある特定の電位に固定されていなかっ
た。2. Description of the Related Art In a conventional liquid crystal display device, when a reflective liquid crystal display element is provided, the reflector of the liquid crystal display element is not electrically grounded or fixed to a certain potential.
【０００３】また背面照明装置を有する透過型液晶表示
装置では、照明装置の背面と回路基板の間に、接地もし
くはある特定の電位に固定された金属板を装備していな
かった。Further, in a transmissive liquid crystal display device having a back lighting device, a metal plate fixed to a ground or a specific potential is not provided between the back surface of the lighting device and the circuit board.
【０００４】[0004]
【発明が解決しようとする課題】しかし、前記従来技術
では液晶表示装置を構成する回路基板等から輻射される
不要輻射雑音により、液晶表示装置単体はもちろんのこ
と、これらの液晶表示装置を用いた電子機器が、電磁障
害を他の電子機器に与える可能性があるという問題点を
有していた。However, in the above-mentioned prior art, the liquid crystal display device is used not only by the liquid crystal display device itself but also by the use of these liquid crystal display devices due to the unnecessary radiation noise radiated from the circuit board constituting the liquid crystal display device. The electronic device has a problem that it may cause electromagnetic interference to other electronic devices.
【０００５】そこで、本発明は上記問題点を解決するも
ので、その目的とするところは不要輻射雑音を低減した
液晶表示装置を提供し、さらに液晶表示装置を用いた電
子機器の不要輻射雑音を低減して、電磁障害を引き起こ
しにくい電子機器を提供することである。Therefore, the present invention solves the above-mentioned problems, and an object of the present invention is to provide a liquid crystal display device in which unnecessary radiation noise is reduced, and further unnecessary radiation noise of electronic equipment using the liquid crystal display device is reduced. An object is to provide an electronic device that is less likely to cause electromagnetic interference.
【０００６】[0006]
【課題を解決するための手段】第１の本発明の液晶表示
装置は、反射型液晶表示素子を有する場合その表示素子
裏面に貼り付けられた金属製反射板を接地したことを特
徴とする。The liquid crystal display device according to the first aspect of the present invention is characterized in that, when the liquid crystal display device has a reflection type liquid crystal display element, a metallic reflector attached to the back surface of the display element is grounded.
【０００７】第２の本発明の液晶表示装置は、背面照明
装置と透過型液晶表示素子を有する場合その照明装置の
背面に金属製反射板を装備し、該反射板を接地したこと
を特徴とする。The liquid crystal display device according to the second aspect of the present invention is characterized in that, when it has a back lighting device and a transmissive liquid crystal display element, a metal reflecting plate is provided on the back face of the lighting device and the reflecting plate is grounded. To do.
【０００８】第３の本発明の電子機器は、第一または第
二の本発明の液晶表示装置を使用したことを特徴とす
る。An electronic apparatus according to a third aspect of the present invention uses the liquid crystal display device according to the first or second aspect of the present invention.
【０００９】[0009]
【実施例】以下本発明の実施例を説明する。EXAMPLES Examples of the present invention will be described below.
【００１０】〔実施例１〕本発明の一実施例を図１を用
いて説明する。[Embodiment 1] An embodiment of the present invention will be described with reference to FIG.
【００１１】図は液晶表示素子として反射型液晶表示素
子を用いた場合である。反射型液晶表示素子はガラス基
板２の背面に偏光板と共に貼り合わされた金属製の反射
板１を有している。この反射板には一般的にはアルミニ
ウム箔の貼り付けもしくはアルミニウム等の金属を蒸着
したものが用いられているが、本実施例では厚み１００
μｍのアルミニウム箔を偏光板３に貼り付け、アルミニ
ウム箔の一辺を延長し回路基板４の接地線路に両面導通
テープ５を用いて接続した。この反射板は液晶表示素子
のガラス基板のほぼ全面を覆う構造とした。この結果反
射板を接地する前後では、不要輻射磁界強度は液晶表示
素子の表面にて測定したところ、接地後でピーク値の比
較で８ｄＢμＡ／ｍの減少が見られた。The figure shows the case where a reflective liquid crystal display element is used as the liquid crystal display element. The reflection type liquid crystal display element has a metal reflection plate 1 attached to the back surface of a glass substrate 2 together with a polarizing plate. As the reflector, an aluminum foil attached or a metal such as aluminum vapor-deposited is generally used. In this embodiment, the thickness is 100.
An aluminum foil of μm was attached to the polarizing plate 3, one side of the aluminum foil was extended and connected to the ground line of the circuit board 4 using the double-sided conductive tape 5. The reflector has a structure that covers almost the entire surface of the glass substrate of the liquid crystal display element. As a result, before and after the reflection plate was grounded, the intensity of the unwanted radiation magnetic field was measured on the surface of the liquid crystal display element, and a reduction of 8 dBμA / m was observed in the comparison of the peak values after the grounding.
【００１２】また、本実施例の液晶表示素子をパーソナ
ルコンピュータの表示装置として使用したが同様の不要
輻射強度の減少が見られた。Further, when the liquid crystal display device of this embodiment was used as a display device of a personal computer, similar reduction of unwanted radiation intensity was observed.
【００１３】〔実施例２〕つぎに他の実施例を図２を用
いて説明する。[Embodiment 2] Next, another embodiment will be described with reference to FIG.
【００１４】図は液晶表示素子として透過型液晶表示素
子を用い、背面に照明装置６を有している。本実施例で
は前記実施例１のように液晶表示素子に反射板を有して
いないため代わりに照明装置６の背面と回路基板４の間
に厚み１００μｍのアルミニウム箔からなる金属板７を
挟み込んでいる。実際には該金属箔はアルミニウム箔の
片面に絶縁膜を貼る付けた構造を持ち、その絶縁膜側を
回路基板４に非導電性の両面テープで貼り付けている。
本実施例の金属箔の寸法は液晶表示素子の表示部の開口
寸法にほぼ等しくしている。また金属箔は一辺を延長し
一点を回路基板４の接地線路に両面導通テープ５を用い
て接続した。この結果不要輻射磁界強度は液晶表示装置
の表面で測定したところ、前記実施例１と同等の減少が
見られた。なお本実施例では金属箔の材質をアルミニウ
ムとしたが、銅箔もしくは鋼板等の他の材質でも減少す
る磁界強度に差はあるが差し支えない。In the figure, a transmissive liquid crystal display element is used as a liquid crystal display element, and an illuminating device 6 is provided on the back surface. In this embodiment, unlike the first embodiment, since the liquid crystal display element does not have a reflection plate, a metal plate 7 made of aluminum foil having a thickness of 100 μm is sandwiched between the back surface of the lighting device 6 and the circuit board 4 instead. There is. In practice, the metal foil has a structure in which an insulating film is attached to one surface of an aluminum foil, and the insulating film side is attached to the circuit board 4 with a non-conductive double-sided tape.
The size of the metal foil of this embodiment is made substantially equal to the size of the opening of the display section of the liquid crystal display element. Further, one side of the metal foil was extended and one point was connected to the ground line of the circuit board 4 using the double-sided conductive tape 5. As a result, when the intensity of the unnecessary radiation magnetic field was measured on the surface of the liquid crystal display device, the same reduction as in Example 1 was observed. In this embodiment, the material of the metal foil is aluminum, but other materials such as copper foil or steel plate may be used although there is a difference in the magnetic field strength to be reduced.
【００１５】[0015]
【発明の効果】以上説明したように本発明によれば、液
晶表示素子の反射板を接地することでシールド効果が得
られ、液晶表示装置から発生する不要輻射雑音を減少さ
せる効果を有する。また本発明の液晶表示装置を使用し
た電子機器の不要輻射雑音を低減させ、電子機器の電磁
障害を引き起こしにくくさせる効果をも有する。As described above, according to the present invention, the shield effect is obtained by grounding the reflector of the liquid crystal display element, and the unnecessary radiation noise generated from the liquid crystal display device is reduced. Further, it also has an effect of reducing unnecessary radiation noise of an electronic device using the liquid crystal display device of the present invention and making it difficult to cause electromagnetic interference of the electronic device.
【図１】本発明の一実施例を示す断面図。FIG. 1 is a sectional view showing an embodiment of the present invention.
【図２】本発明の他の実施例を示す断面図。FIG. 2 is a sectional view showing another embodiment of the present invention.
【図３】従来の液晶表示装置を示す断面図。FIG. 3 is a cross-sectional view showing a conventional liquid crystal display device.
１．金属性反射板 ２．ガラス基板 ３．偏光板 ４．回路基板 ５．両面導通テープ ６．照明装置 ７．金属板 1. Metallic reflector 2. Glass substrate 3. Polarizing plate 4. Circuit board 5. Double-sided conductive tape 6. Lighting device 7. Metal plate
Claims (3)
において、液晶表示素子に貼り付けられた金属製反射板
を、接地したことを特徴とする液晶表示装置。1. A liquid crystal display device having a reflection type liquid crystal display device, wherein a metallic reflector attached to the liquid crystal display device is grounded.
る液晶表示装置において、照明装置の背面に金属板を装
備し、該金属板を接地したことを特徴とする液晶表示装
置。2. A liquid crystal display device having a back lighting device and a transmissive liquid crystal display element, wherein a metal plate is provided on the back surface of the lighting device and the metal plate is grounded.
装置を用いたことを特徴とする電子機器。3. An electronic apparatus using the liquid crystal display device according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4067009A JPH05273547A (en) | 1992-03-25 | 1992-03-25 | Liquid crystal display device and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4067009A JPH05273547A (en) | 1992-03-25 | 1992-03-25 | Liquid crystal display device and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05273547A true JPH05273547A (en) | 1993-10-22 |
Family
ID=13332498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4067009A Pending JPH05273547A (en) | 1992-03-25 | 1992-03-25 | Liquid crystal display device and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05273547A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100469340B1 (en) * | 1996-11-29 | 2005-07-07 | 엘지.필립스 엘시디 주식회사 | LCD Display |
-
1992
- 1992-03-25 JP JP4067009A patent/JPH05273547A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100469340B1 (en) * | 1996-11-29 | 2005-07-07 | 엘지.필립스 엘시디 주식회사 | LCD Display |
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