JP2946288B2 - Liquid crystal display - Google Patents
Liquid crystal displayInfo
- Publication number
- JP2946288B2 JP2946288B2 JP7164007A JP16400795A JP2946288B2 JP 2946288 B2 JP2946288 B2 JP 2946288B2 JP 7164007 A JP7164007 A JP 7164007A JP 16400795 A JP16400795 A JP 16400795A JP 2946288 B2 JP2946288 B2 JP 2946288B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- substrate
- display device
- wiring board
- 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.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/36—Assembling printed circuits with other printed circuits
- H05K3/361—Assembling flexible printed circuits with other printed circuits
Landscapes
- Liquid Crystal (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶表示装置における
周辺回路部材の構成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 of a peripheral circuit member in a liquid crystal display device.
【０００２】[0002]
【従来の技術】液晶を応用した表示装置は、低電力、軽
量など、従来のディスプレーにない特徴を有し、周辺技
術の進歩によって商品力が高まり、さまざまな製品に使
用されている。マトリクス表示を行う液晶表示装置は、
構造としてアクティブマトリクスと、単純マトリクスに
分類されるが、中でも、画素毎にスイッチとして薄膜ト
ランジスタ（以下ＴＦＴと略す）を用いたアクティブマ
トリクス方式の液晶表示装置では、クロストークのない
鮮明な画像表示を得られることから、ノートブックタイ
プ、ラップトップタイプのパソコンのディスプレーや、
カーナビゲーションのディスプレー等に使用され急速に
市場を拡大している。2. Description of the Related Art A display device using liquid crystal has features such as low power and light weight which are not present in a conventional display, and its commercial power has been enhanced by progress in peripheral technology, and it has been used in various products. A liquid crystal display device that performs matrix display is
The structure is classified into an active matrix and a simple matrix. Among them, an active matrix type liquid crystal display device using a thin film transistor (hereinafter abbreviated as TFT) as a switch for each pixel provides a clear image display without crosstalk. Notebook, laptop-type computer display,
It is used for car navigation displays and the like, and its market is rapidly expanding.
【０００３】第２図にＴＦＴを用いた従来のアクティブ
マトリクス方式液晶表示パネル（以下液晶パネルと略
す）の一例を示す。図中、１は上側のガラス基板、２は
このガラス基板１上に形成された共通電極、３は下側の
ガラス基板で、その上には信号線４、信号線接続端子
５、ＴＦＴ６、および駆動電極７がマトリクス状に形成
されている。これら２枚の上下ガラス基板１，３間に液
晶を挟み込み、偏光板を貼り付けることにより液晶パネ
ル８が構成される。FIG. 2 shows an example of a conventional active matrix type liquid crystal display panel using a TFT (hereinafter abbreviated as a liquid crystal panel). In the figure, 1 is an upper glass substrate, 2 is a common electrode formed on the glass substrate 1, 3 is a lower glass substrate, and a signal line 4, a signal line connection terminal 5, a TFT 6, and The drive electrodes 7 are formed in a matrix. A liquid crystal is sandwiched between these two upper and lower glass substrates 1 and 3 and a polarizing plate is attached to form a liquid crystal panel 8.
【０００４】この液晶パネル８に信号を供給するには、
図３、図４に示すように、ポリイミドテープ10aに銅箔
で配線と端子を形成したフレキシブル基板10に駆動用集
積回路（以下ＩＣと略す）９をＴＡＢ（Tape Automated
Bonding)法により搭載し、液晶パネル８上の図２に示
す信号線接続端子５と図４に示す出力信号線12とを異方
性導電材を用いて接続する。フレキシブル基板10への信
号供給路はプリント基板を用いたバス配線基板11を別途
用意し、その入力信号線13をバス配線基板11の端子に半
田付け接続することによって形成される。半田付けは、
フレキシブル基板10の入力信号線13側にコテ先をあてて
行うため、この部分は、図４Ａの部分ポリイミドテープ
10aが取り除かれている。To supply a signal to the liquid crystal panel 8,
As shown in FIGS. 3 and 4, a driving integrated circuit (hereinafter abbreviated as IC) 9 is mounted on a flexible substrate 10 in which wiring and terminals are formed of copper foil on a polyimide tape 10a by TAB (Tape Automated).
The signal line connection terminal 5 shown in FIG. 2 on the liquid crystal panel 8 is connected to the output signal line 12 shown in FIG. 4 using an anisotropic conductive material. A signal supply path to the flexible board 10 is formed by separately preparing a bus wiring board 11 using a printed board and soldering the input signal lines 13 to terminals of the bus wiring board 11. Soldering is
In order to apply an iron tip to the input signal line 13 side of the flexible substrate 10, this portion is a partial polyimide tape of FIG. 4A.
10a has been removed.
【０００５】また、図示しないが、単純マトリクス方式
の液晶表示パネルの構成においては、片方のガラス基板
表面にストライプ状に走査線透明電極と走査線接続端子
を形成し、もう一方のガラス基板表面にストライプ状に
データ線透明電極とデータ線接続端子を形成して、これ
ら透明電極を形成した面同士の間に液晶を挟み、走査線
とデータ線が直交するように貼り合わせたものが一般的
であり、その信号供給は、それぞれのガラス基板に形成
された接続端子にアクティブマトリクスパネルの場合と
同様に、ＩＣを実装したフレキシブル基板を接続し、更
に、フレキシブル基板には、バス配線基板を接続する。Although not shown, in the configuration of the liquid crystal display panel of the simple matrix type, a scanning line transparent electrode and a scanning line connection terminal are formed in a stripe shape on one glass substrate surface, and the other glass substrate surface is formed on the other glass substrate surface. In general, a data line transparent electrode and a data line connection terminal are formed in a stripe shape, a liquid crystal is sandwiched between the surfaces on which these transparent electrodes are formed, and the scanning line and the data line are bonded so as to be orthogonal. The signal is supplied by connecting a flexible substrate on which an IC is mounted to a connection terminal formed on each glass substrate, as in the case of the active matrix panel, and further connecting a bus wiring substrate to the flexible substrate. .
【０００６】しかしながら、ノートブックタイプのパソ
コンは、携帯性が重視され、パソコン本体の外形サイズ
はＡ４サイズが主流になっており、これらに用いられる
液晶表示装置は、当初画面対角寸法が22cm（８〜９イン
チ）程度であったが、パソコン本体サイズはＡ４サイズ
のままでより大きな画面が要望され、最近では、画面対
角寸法が26cm（10.4インチ）〜29cm（11.3インチ）にシ
フトしてきた。そのために液晶表示装置は、特に縦方向
の画面以外の領域、例えば、ＩＣやバス配線基板の寸法
を小型化することが必要となり、この部分の小型化への
取り組みがなされている。[0006] However, portable computers are important for notebook-type personal computers, and the main body of the personal computer is mainly of A4 size, and the liquid crystal display device used for these computers initially has a screen diagonal size of 22 cm ( Although it was about 8-9 inches), a larger screen was demanded while maintaining the A4 size of the main body of the personal computer. Recently, the screen diagonal size has shifted from 26 cm (10.4 inches) to 29 cm (11.3 inches). . Therefore, in the liquid crystal display device, it is necessary to reduce the size of a region other than the screen in the vertical direction, for example, the size of an IC or a bus wiring board, and efforts are being made to reduce the size of this portion.
【０００７】その一つとして、図５(a)(b)に示すよう
に、フレキシブル基板10を折曲げ、バス配線基板11の寸
法を見かけ上なくし、液晶表示装置の縦方向の寸法Ｌを
小さくする構成が提案されているが、パソコン用カラー
液晶表示装置の場合、ＩＣは10個程度実装する必要があ
り、ポリイミドテープ10aの使用量が増え、コストアッ
プとなることや、バス配線基板11の位置関係等から、液
晶のバックライト等を装着する作業が自動化に適さない
など問題がある。As one of them, as shown in FIGS. 5 (a) and 5 (b), the flexible board 10 is bent to make the dimensions of the bus wiring board 11 apparent and to reduce the vertical dimension L of the liquid crystal display device. However, in the case of a color liquid crystal display device for a personal computer, it is necessary to mount about 10 ICs, the use amount of the polyimide tape 10a increases, the cost increases, and the bus wiring board 11 Due to the positional relationship and the like, there is a problem that the work of mounting a liquid crystal backlight or the like is not suitable for automation.
【０００８】更に、これらの対策として、図６に示すよ
うに、ＩＣ９とフレキシブル基板10、および、バス配線
基板11の寸法を小さくし、さらに、上下２方向あった信
号接続端子を一方に寄せ、フレキシブル基板10を折曲げ
ずに縦方向寸法Ｌを小さくする構成が提案され、縦方向
の寸法Ｌを小さくする構成として有力と考えられる。As a countermeasure against the above, as shown in FIG. 6, the dimensions of the IC 9, the flexible board 10, and the bus wiring board 11 are reduced, and the signal connection terminals arranged in two directions are moved to one side. A configuration in which the vertical dimension L is reduced without bending the flexible substrate 10 has been proposed, and is considered to be effective as a configuration in which the vertical dimension L is reduced.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、この構
成では、接続端子間ピッチが半分になることなどから、
フレキシブル基板上の配線は寸法精度を上げるために、
配線厚みを小さくしなければならず、この構成の液晶表
示装置に温度サイクル試験を実施すると、液晶パネル８
と、バス配線基板11との熱膨張差により、フレキシブル
基板９にストレスが加わり、ポリイミドテープ10aが取
り除かれている図４Ａの部分入力信号線13に応力が集中
し、この部分の配線が断線するという問題がある。これ
を防ぐために、フレキシブル基板10とバス配線基板11を
エポキシ樹脂等の接着剤で接着することも考えられる
が、このようにすると、フレキシブル基板10のリペアが
できなくなる。However, in this configuration, the pitch between the connection terminals is halved, and so on.
The wiring on the flexible board is
The wiring thickness must be reduced. When a temperature cycle test is performed on the liquid crystal display device having this configuration, the liquid crystal panel 8
4A, stress is applied to the flexible substrate 9 due to the difference in thermal expansion between the substrate and the bus wiring board 11, and the stress concentrates on the partial input signal line 13 in FIG. 4A from which the polyimide tape 10a is removed, and the wiring in this portion is disconnected. There is a problem. In order to prevent this, the flexible substrate 10 and the bus wiring substrate 11 may be bonded with an adhesive such as an epoxy resin, but in this case, the flexible substrate 10 cannot be repaired.
【００１０】本発明は上記課題を解決したものであり、
リペア性を落とさずに、温度サイクル性に優れた縦寸法
の小さい液晶表示装置を提供するものである。The present invention has solved the above-mentioned problems, and
An object of the present invention is to provide a liquid crystal display device having a small vertical dimension and excellent in temperature cyclability without reducing repairability.
【００１１】[0011]
【課題を解決するための手段】本発明は上記目的を達成
するために、液晶表示装置におけるバス配線基板のフレ
キシブル基板が接続される面とは反対側の面に、前記バ
ス配線基板の面積と同等もしくそれより大きく、かつ液
晶パネルに用いた透光性基板と同等の熱膨張係数を有す
る部材を室温硬化性接着剤により貼り付けたものであ
る。According to the present invention, in order to achieve the above object, the area of the bus wiring board in the liquid crystal display device, which is opposite to the surface to which the flexible board is connected, is set. A member having a thermal expansion coefficient equal to or larger than that and having the same thermal expansion coefficient as that of the light-transmitting substrate used for the liquid crystal panel is attached by a room-temperature curable adhesive.
【００１２】[0012]
【作用】本発明は上記のように、バス配線基板に液晶パ
ネルに用いた透光性基板と同等の熱膨張係数を有する部
材が貼り付けてあるために、温度サイクル試験を行って
もバス配線基板の熱膨張量はガラス材の熱膨張量に抑え
ることができ、フレキシブル基板上の端子にストレスを
与えることがない。According to the present invention, as described above, the member having the same thermal expansion coefficient as the translucent substrate used for the liquid crystal panel is attached to the bus wiring substrate, so that even if a temperature cycle test is performed, the bus wiring substrate can be used. The amount of thermal expansion of the substrate can be suppressed to the amount of thermal expansion of the glass material, and no stress is applied to the terminals on the flexible substrate.
【００１３】[0013]
【実施例】以下本発明の一実施例について、図１を参照
しながら説明する。図中、21は透光性基板である一対の
ガラス基板20内に画像表示のための表示電極とその表示
電極に接続された端子を形成した液晶パネルで、前記図
２で説明した液晶パネルと同等、もしくは類似の構造の
ものが使用できる。22はＩＣ、23は可撓性フィルム基板
で、この実施例ではポリイミドテープに銅箔で配線と端
子を形成したフレキシブル基板である。このフレキシブ
ル基板23はＩＣ22をＴＡＢ法により搭載し、液晶パネル
21の前記端子と接続されている。フレキシブル基板23へ
の信号供給路はプリント基板を用いたバス配線基板24を
別途用意し、これをフレキシブル基板23の端子に半田付
け接続することによって形成される。このバス配線基板
24には、フレキシブル基板23を接続した面とは反対側の
面に紫外線硬化性樹脂26を用いてガラス材25が貼り付け
られている。An embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 21 denotes a liquid crystal panel in which a display electrode for displaying an image and terminals connected to the display electrode are formed in a pair of glass substrates 20 which are translucent substrates, and the liquid crystal panel described with reference to FIG. Equivalent or similar structures can be used. Reference numeral 22 denotes an IC, and reference numeral 23 denotes a flexible film substrate. In this embodiment, a flexible substrate in which wiring and terminals are formed by a copper foil on a polyimide tape. The flexible substrate 23 has an IC 22 mounted thereon by a TAB method, and has a liquid crystal panel.
21 are connected to the terminals. The signal supply path to the flexible board 23 is formed by separately preparing a bus wiring board 24 using a printed board, and connecting this to the terminals of the flexible board 23 by soldering. This bus wiring board
A glass material 25 is adhered to the surface of the substrate 24 using an ultraviolet curable resin 26 on the surface opposite to the surface to which the flexible substrate 23 is connected.
【００１４】このガラス材25は、液晶パネル21の一対の
ガラス基板20に用いている材質と同一で、バス配線基板
24とその厚み以外は同寸法ものである。これは、液晶パ
ネル21を所定寸法に切り出す際の周辺の余白材を利用し
て作成される。また、このガラス材25は、バス配線基板
24をフレキシブル基板23に取り付けた後、ガラス材25上
の全面に紫外線硬化性樹脂26を塗布し、バス配線基板24
に位置合わせをした後で、ガラス材25側より紫外線照射
を行い貼り付ける。The glass material 25 is the same as the material used for the pair of glass substrates 20 of the liquid crystal panel 21, and
The dimensions are the same except for 24 and its thickness. This is created by using a margin material around the liquid crystal panel 21 when the liquid crystal panel 21 is cut into a predetermined size. Also, this glass material 25 is used for a bus wiring board.
After attaching the 24 to the flexible substrate 23, an ultraviolet curable resin 26 is applied on the entire surface of the glass material 25, and the bus wiring substrate 24
After the alignment, the glass material 25 is irradiated with ultraviolet light and adhered.
【００１５】上記構成において、バス配線基板24（プリ
ント基板：ＦＲ−４）の熱膨張係数は一般的には15×10
~6であり、ＴＦＴ液晶パネル用として不純物を下げたガ
ラス基板20（コーニング社：No.7059）の熱膨張係数は
4.7×10~6であるが、このガラス材25を貼り付けること
により、バス配線基板24の実際の熱膨張量は、ガラス材
25で規正され、バス配線基板24と液晶パネル21は同等の
熱膨張量となる。更に、ガラス材25を貼り付ける際に、
その接着剤として用いる紫外線硬化性樹脂26が室温硬化
性接着剤であるため、接着剤硬化時に加熱硬化等による
熱ストレスが加わらず応力を残すことがない。In the above configuration, the thermal expansion coefficient of the bus wiring board 24 (printed board: FR-4) is generally 15 × 10
It is 1-6, the glass substrate 20 having a reduced impurity for the TFT liquid crystal panel (Corning: No.7059) thermal expansion coefficient of
Although it is 4.7 × 10 to 6 , the actual amount of thermal expansion of the bus wiring board 24 is
The bus wiring board 24 and the liquid crystal panel 21 have the same thermal expansion amount. Furthermore, when attaching the glass material 25,
Since the UV-curable resin 26 used as the adhesive is a room-temperature curable adhesive, no thermal stress due to heat curing or the like is applied during curing of the adhesive, so that no stress remains.
【００１６】このように、本発明によれば、バス配線基
板に、液晶パネルに用いたものと同材質のガラス材が、
紫外線硬化性樹脂により貼り付けられているため、液晶
パネルと、バス配線基板との熱膨張量を同等に抑えるこ
とができ、対温度サイクル性を上げることができるの
で、フレキシブル基板を平板状のまま小型化して配置す
ることができ、液晶表示装置を高信頼性、かつ縦寸法の
小さいものとすることができる。As described above, according to the present invention, the bus wiring board is made of the same glass material as that used for the liquid crystal panel.
Since it is pasted with UV curable resin, the thermal expansion between the liquid crystal panel and the bus wiring board can be suppressed to the same level, and the temperature cycling property can be improved. The liquid crystal display device can be miniaturized and arranged, and the liquid crystal display device can have high reliability and small vertical dimensions.
【００１７】なお、本実施例では、ガラス材の大きさを
バス配線基板と同一としたが、バス配線基板より大きく
ても同様の効果は得られる。また、室温硬化性接着剤と
して２液混合硬化タイプのエポキシ接着剤も有効であ
る。In this embodiment, the size of the glass material is the same as that of the bus wiring board. However, the same effect can be obtained if the glass material is larger than the bus wiring board. An epoxy adhesive of a two-component curing type is also effective as a room temperature curable adhesive.
【００１８】[0018]
【発明の効果】本発明は上記実施例から明かなように、
液晶パネルに用いた透光性基板と同等の熱膨張係数を有
する部材が室温硬化性接着剤によりバス配線基板に貼り
付けられているため、液晶パネルと、バス配線基板との
熱膨張量は同等になり、熱膨張によるフレキシブル基板
へのストレスが抑えられ、フレキシブル基板をバス配線
基板へ接着することなく対温度サイクル性を上げること
ができる。従って、リペアも容易であり、また、フレキ
シブル基板を平板状のまま小型化することができ、高信
頼性で縦寸法の小さい液晶表示装置を提供することがで
きる。言い替えれば、液晶表示装置の外径寸法を、これ
を取り付けるパソコン等の機器本体の外径寸法に近づけ
ることが可能となる。According to the present invention, as apparent from the above embodiment,
Since a member having the same thermal expansion coefficient as the translucent substrate used for the liquid crystal panel is attached to the bus wiring substrate with a room-temperature curable adhesive, the thermal expansion of the liquid crystal panel is equal to that of the bus wiring substrate Thus, stress on the flexible substrate due to thermal expansion is suppressed, and the temperature cycle property can be improved without adhering the flexible substrate to the bus wiring substrate. Therefore, repair is easy, the size of the flexible substrate can be reduced while keeping the flat shape, and a highly reliable liquid crystal display device having a small vertical dimension can be provided. In other words, it is possible to make the outer diameter of the liquid crystal display device close to the outer diameter of a device body such as a personal computer to which the liquid crystal display device is attached.
【図１】本発明の液晶表示装置の一実施例を示す一部省
略斜視図である。FIG. 1 is a partially omitted perspective view showing one embodiment of a liquid crystal display device of the present invention.
【図２】従来の液晶表示装置の液晶表示パネル部分を分
解して示す一部省略斜視図である。FIG. 2 is an exploded perspective view showing a part of a liquid crystal display panel of a conventional liquid crystal display device in an exploded manner.
【図３】従来の液晶表示装置の一例を示す一部省略斜視
図である。FIG. 3 is a partially omitted perspective view showing an example of a conventional liquid crystal display device.
【図４】一般的に用いられているフレキシブル基板の平
面図である。FIG. 4 is a plan view of a generally used flexible substrate.
【図５】従来の液晶表示装置におけるフレキシブル基板
を折曲げたタイプの構成図である。FIG. 5 is a configuration diagram of a conventional liquid crystal display device in which a flexible substrate is bent.
【図６】従来の液晶表示装置におけるフレキシブル基板
を平板状のまま小型化したタイプの構成図である。FIG. 6 is a configuration diagram of a conventional liquid crystal display device in which a flexible substrate is reduced in size while remaining flat.
20…ガラス基板、 21…液晶パネル、 22…ＩＣ、 23
…フレキシブル基板、24…バス配線基板、 25…ガラス
材、 26…紫外線硬化性樹脂。20: glass substrate, 21: liquid crystal panel, 22: IC, 23
... flexible board, 24 ... bus wiring board, 25 ... glass material, 26 ... ultraviolet curable resin.
Claims (1)
板間に液晶を介在させた液晶表示パネルと、この透光性
基板に接続される集積回路を搭載した可撓性フィルム基
板と、この可撓性フィルム基板に接続され前記集積回路
に信号を供給する配線基板を有する液晶表示装置におい
て、前記配線基板の前記可撓性フィルム基板を接続する
面とは反対側の面に、前記透光性基板と同等の熱膨張係
数を有する材質で、しかも、この配線基板の面積と同等
もしくはこれよりも大きい面積を有する部材が室温硬化
性接着剤によって接着されていることを特徴とする液晶
表示装置。A liquid crystal display panel having a liquid crystal interposed between a pair of light transmitting substrates on which image display electrodes are formed; a flexible film substrate on which an integrated circuit connected to the light transmitting substrate is mounted; In a liquid crystal display device having a wiring board connected to the flexible film substrate and supplying a signal to the integrated circuit, the transparent board is provided on a surface of the wiring substrate opposite to a surface to which the flexible film substrate is connected. A liquid crystal display characterized in that a member having a thermal expansion coefficient equivalent to that of an optical substrate and a member having an area equal to or larger than the area of the wiring board is bonded by a room-temperature curable adhesive. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7164007A JP2946288B2 (en) | 1995-06-29 | 1995-06-29 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7164007A JP2946288B2 (en) | 1995-06-29 | 1995-06-29 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0915638A JPH0915638A (en) | 1997-01-17 |
| JP2946288B2 true JP2946288B2 (en) | 1999-09-06 |
Family
ID=15785001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7164007A Expired - Fee Related JP2946288B2 (en) | 1995-06-29 | 1995-06-29 | Liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2946288B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4848627B2 (en) * | 2004-09-27 | 2011-12-28 | パナソニック株式会社 | Display panel assembling apparatus and assembling method |
| US9804639B2 (en) | 2013-08-15 | 2017-10-31 | Apple Inc. | Hinged portable electronic device with display circuitry located in base |
-
1995
- 1995-06-29 JP JP7164007A patent/JP2946288B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0915638A (en) | 1997-01-17 |
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