JP3160206B2 - Liquid crystal display with sounding body - Google Patents
Liquid crystal display with sounding bodyInfo
- Publication number
- JP3160206B2 JP3160206B2 JP26462996A JP26462996A JP3160206B2 JP 3160206 B2 JP3160206 B2 JP 3160206B2 JP 26462996 A JP26462996 A JP 26462996A JP 26462996 A JP26462996 A JP 26462996A JP 3160206 B2 JP3160206 B2 JP 3160206B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- driving
- sounding body
- crystal display
- circuit
- 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
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Transforming Electric Information Into Light Information (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は小型の携帯情報機器
に用いられる液晶表示素子、発音体及びそれらの駆動回
路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display element, a sounding body, and a driving circuit for use in a small portable information device.
【０００２】[0002]
【従来の技術】従来、無線式個人呼出装置、携帯電話、
および小型のパーソナルコンピューター等、液晶表示装
置と例えばアラーム音や種々の確認音、操作音を得る目
的の発音体は別々に構成され配置されている。2. Description of the Related Art Conventionally, wireless personal calling devices, mobile phones,
In addition, a liquid crystal display device such as a small personal computer and a sounding body for obtaining, for example, an alarm sound, various confirmation sounds, and operation sounds are separately configured and arranged.
【０００３】[0003]
【発明が解決しようとする課題】従来のこれらの小型携
帯機器においては小型化、低消費電力であることが消費
者にとって有利であるが、それに使われる発音体や液晶
表示素子は消費電力の点、およびサイズの点からもネッ
クとなっている。つまり発音体の駆動効率を上げようと
するとサイズ（振動体の面積）が大きくなり小型化と逆
行してしまい、また表示素子の表示容量は年々サービス
内容の向上とともに大容量化するが、そのために表示素
子自体の面積も大きくなり、かつ駆動電圧も高くなり、
同時に低電力化が進まないという問題があった。In these conventional small portable devices, miniaturization and low power consumption are advantageous for consumers, but the sounding body and the liquid crystal display element used for them are low in power consumption. , And size. In other words, when trying to increase the driving efficiency of the sounding body, the size (the area of the vibrating body) increases, which goes against miniaturization, and the display capacity of the display element increases year by year with the improvement of service contents. The area of the display element itself also increases, and the driving voltage also increases,
At the same time, there has been a problem that power consumption has not been reduced.
【０００４】[0004]
【課題を解決するための手段】本発明は上記の問題点を
解決するために液晶表示のための液晶パネルを形成する
２枚のガラスのうち、片方のガラス面上に圧電素子及び
それに係わる駆動回路を実装するとともに、液晶駆動に
係わる駆動回路素子も同一面上に配置した。これにより
液晶表示のためのガラス基板を発音体として作用させ、
かつ両者の駆動のため昇圧コイルを兼用化させ、少ない
スペースで効率の良い表示装置とすることができる。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention solves the above-mentioned problems by, among two glasses forming a liquid crystal panel for a liquid crystal display, a piezoelectric element and driving related to the piezoelectric element on one glass surface. The circuit was mounted, and the driving circuit elements for driving the liquid crystal were arranged on the same plane. This allows the glass substrate for the liquid crystal display to act as a sounding body,
In addition, a booster coil can be used for both driving, and an efficient display device can be provided in a small space.
【０００５】[0005]
【発明の実施の形態】以下図面に従って動作を説明す
る。図１は本発明による発音体付き表示装置の断面図を
表わし、図２はその下平面図である。１及び２は液晶表
示のための、上ガラスと下ガラスである。これらガラス
は適度の隙間を隔てて対向配置され、その隙間には液晶
材が注入されている。表示する文字数が多くなると時分
割ドライブを行うパルス幅が狭くなり、電源電圧を高く
しないと適度なコントラストが得られない。上ガラス１
は出っ張り部３を有し、その下面には液晶駆動用ＩＣ
４、昇圧コイル５、圧電素子６、昇圧用ＩＣ８及び接続
基板７が実装されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The operation will be described below with reference to the drawings. FIG. 1 is a sectional view of a display device with a sounding body according to the present invention, and FIG. 2 is a plan view therebelow. 1 and 2 are an upper glass and a lower glass for a liquid crystal display. These glasses are opposed to each other with an appropriate gap therebetween, and a liquid crystal material is injected into the gap. When the number of characters to be displayed increases, the pulse width for time-division driving becomes narrow, and an appropriate contrast cannot be obtained unless the power supply voltage is increased. Upper glass 1
Has a protruding portion 3 and a liquid crystal driving IC on the lower surface thereof.
4, a booster coil 5, a piezoelectric element 6, a booster IC 8, and a connection board 7 are mounted.
【０００６】圧電素子６に可聴領域周波数の断続信号を
印加することにより、上ガラス１は屈曲振動を行い発音
する。図３は図２のＡ−Ａ断面図を示している。上ガラ
ス１および下ガラス２の端面は支持体９を挟んでケース
１０に固定される。支持体９は例えばプラスチックパッ
キンで構成されガラスの端面を一様に支持している。こ
のように、ガラスの端面の内、対向する２箇所をガラス
中心に向かって圧縮固定することにより比較的低周波数
のガラス共振点が得られ効率良く発音できる。つまり小
型の携帯情報機器で表示ガラスの小さいもの（４センチ
メートル四方程度）のガラスでも数キロヘルツの共振点
が得られる。When an intermittent signal having an audible frequency is applied to the piezoelectric element 6, the upper glass 1 bends and emits sound. FIG. 3 is a sectional view taken along line AA of FIG. The end surfaces of the upper glass 1 and the lower glass 2 are fixed to the case 10 with the support 9 interposed therebetween. The support 9 is made of, for example, plastic packing and uniformly supports the end face of the glass. As described above, by compressing and fixing two opposing portions of the end face of the glass toward the center of the glass, a relatively low frequency glass resonance point can be obtained and sound can be efficiently emitted. In other words, a resonance point of several kilohertz can be obtained even with a small display glass (about 4 cm square) in a small portable information device.
【０００７】接続基板７からは液晶駆動を行うためのイ
ンストラクション信号、データ信号、発音のためのイン
ストラクション信号が入力され液晶駆動用ＩＣ４、及び
昇圧用ＩＣ８を制御する。ここで昇圧用ＩＣ８は液晶駆
動のための電源を造る働きと圧電素子を駆動する働きを
行い、これに接続された昇圧コイル５は両者の役割に時
分割的に作用する。An instruction signal for driving the liquid crystal, a data signal, and an instruction signal for sound generation are input from the connection board 7 to control the liquid crystal driving IC 4 and the boosting IC 8. Here, the booster IC 8 performs a function of creating a power supply for driving the liquid crystal and a function of driving the piezoelectric element, and the booster coil 5 connected thereto acts on both roles in a time-division manner.
【０００８】図４は液晶駆動用ＩＣ４のブロック図であ
る。制御端子１７は複数の端子からなり、通常本体ＭＰ
Ｕからの表示データ信号やインストラクション信号が入
力され、ＭＰＵインタフェイス１１にてインストラクシ
ョンのデコード、及びＭＰＵとの信号の制御を行う。表
示ＲＡＭ１２では表示データを８ビットの文字コードと
して記憶し、この内容はＣＧＲＯＭ（キャラクタージェ
ネレータＲＯＭ）１３によって例えば５Ｘ８ドットの表
示パターンが発生する。液晶駆動回路１６は液晶駆動の
ため比較的高い電圧で動作し、液晶素子に充分な電流が
得られるトランジスタを有し、ＣＧＲＯＭ１３のコード
により複数の表示信号１８を出力する。他方発振回路１
４を有し液晶の時分割駆動を行うタイミングを得るとと
もに、信号１９を発生し昇圧用ＩＣ８を制御する。液晶
電源回路１５は、昇圧用ＩＣ８の出力２０を電源として
動作し、液晶の特性に合致した複数の電圧（中間バイア
ス電位、及びその温度補正）を出力する。またこの回路
１５は液晶駆動回路およびそれに接続される液晶素子を
充分駆動するためのドライブ能力が要求されオペアンプ
等が内臓される。以上により液晶駆動用ＩＣ４は構成さ
れ本体ＭＰＵの信号および昇圧ＩＣ８の出力により液晶
表示を行う。FIG. 4 is a block diagram of the liquid crystal driving IC 4. The control terminal 17 is composed of a plurality of terminals.
The display data signal and the instruction signal from the U are input, and the MPU interface 11 decodes the instruction and controls the signal with the MPU. The display RAM 12 stores the display data as an 8-bit character code, and a CGROM (character generator ROM) 13 generates a display pattern of, for example, 5 × 8 dots. The liquid crystal drive circuit 16 operates at a relatively high voltage for driving the liquid crystal, has a transistor capable of providing a sufficient current to the liquid crystal element, and outputs a plurality of display signals 18 by the code of the CGROM 13. Oscillation circuit 1
4 and a timing for performing time-division driving of the liquid crystal is obtained, and a signal 19 is generated to control the boosting IC 8. The liquid crystal power supply circuit 15 operates using the output 20 of the step-up IC 8 as a power supply, and outputs a plurality of voltages (intermediate bias potential and temperature correction thereof) that match the characteristics of the liquid crystal. Further, this circuit 15 is required to have a drive capability for sufficiently driving a liquid crystal drive circuit and a liquid crystal element connected thereto, and includes an operational amplifier and the like. The liquid crystal driving IC 4 is configured as described above, and performs liquid crystal display by the signal of the main body MPU and the output of the booster IC 8.
【０００９】図５は昇圧ＩＣ８とそれに接続される素子
の回路図である。タイミング制御回路はゲート回路から
なり信号３１、３２及び３３を出力する。ここで昇圧出
力２０を得る場合は、信号３２をハイレベル、信号３３
をローレベルにすることにより、トランジスタ２２はオ
ン、トランジスタ２４はオフとなる。トランジスタ２２
のオンによりトランジスタ２３はオンとなり、信号３１
に図６に示す様なパルスを加えると、トランジスタ２１
がオンの期間コイル５に電流が流れ、該トランジスタ２
１がオフすると、コイル５の逆起電圧はトランジスタ２
３、ダイオード２６をかいして、コンデンサ２７に蓄積
される。ここでダイオード２６は逆流防止を行い、コン
デンサ２７と並列接続されたツェナーダイオード２８は
所望の出力電圧２０を決定する。FIG. 5 is a circuit diagram of the booster IC 8 and elements connected thereto. The timing control circuit is composed of a gate circuit and outputs signals 31, 32 and 33. Here, when the boosted output 20 is obtained, the signal 32 is set to the high level and the signal 33 is set to the high level.
To a low level, the transistor 22 is turned on and the transistor 24 is turned off. Transistor 22
Turns on, the transistor 23 turns on, and the signal 31
When a pulse as shown in FIG.
Current flows through the coil 5 while the transistor 2 is on, and the transistor 2
When 1 is turned off, the back electromotive voltage of the coil 5 becomes the transistor 2
3. It is stored in the capacitor 27 through the diode 26. Here, the diode 26 performs backflow prevention, and the Zener diode 28 connected in parallel with the capacitor 27 determines a desired output voltage 20.
【００１０】他方発音を行う場合は信号３１及び信号３
２をローレベルとし、信号３３に図６の発音時に示すよ
うな断続信号を加える。これによりトランジスタ２４が
オンの時、コイル５に電流が流れ、オフした時の逆起電
圧はダイオード２５を介して圧電素子６に蓄積される。
しかし次にトランジスタ２４がオンとなると、圧電素子
６の電荷は放電される。このように圧電素子６は信号３
３の断続周期にあわせて充放電を繰り返し振動する。On the other hand, when sound is generated, the signals 31 and 3
2 is set to a low level, and an intermittent signal as shown in FIG. Thus, when the transistor 24 is on, a current flows through the coil 5, and when the transistor 24 is off, the back electromotive voltage is accumulated in the piezoelectric element 6 via the diode 25.
However, when the transistor 24 is turned on next time, the electric charge of the piezoelectric element 6 is discharged. As described above, the piezoelectric element 6 outputs the signal 3
Charge and discharge are repeated in accordance with the intermittent cycle of No. 3 and vibrate.
【００１１】以上のように動作する図５に示す回路にお
いて、タイミング制御回路２９、トランジスタ２１、２
２、２３、２４、ダイオード２５、２６およびツェナー
ダイオード２８は図１、または図２における昇圧用ＩＣ
８を構成している。またコンデンサ２７は図示してない
が、上ガラス１の面上に実装できる。In the circuit shown in FIG. 5 operating as described above, the timing control circuit 29, the transistors 21, 2
2, 23, 24, diodes 25, 26 and zener diode 28 are the booster ICs in FIG. 1 or FIG.
8. Although not shown, the capacitor 27 can be mounted on the surface of the upper glass 1.
【００１２】[0012]
【発明の効果】本発明は以上のような形態で実施され、
以下に記載する効果を発揮する。発音体を別に配置する
必要がなくなるため機器全体の小型化およびローコスト
に著しく貢献する。The present invention is embodied in the form described above,
The following effects are exhibited. Since it is not necessary to arrange a sounding body separately, it greatly contributes to downsizing of the entire device and low cost.
【００１３】又、高い電圧を必要とする２つの部品を１
つの部品としてまとめ昇圧回路を兼用化したため、機器
全体の回路構成も簡略化できる。特に大電流の流れる２
つの部品がユニットされたことにより、ノイズ対策上も
簡単になる。In addition, two parts requiring high voltage
Since the components are combined and used as a booster circuit, the circuit configuration of the entire device can be simplified. Especially where a large current flows 2
Since the three components are united, noise countermeasures can be simplified.
【００１４】さらに、小型の携帯機器では消費電力が重
要であるが、本発明では圧電体を駆動することによりガ
ラスを発音体として使い発音の効率は向上し、かつ回路
素子を増すことなく昇圧回路を動作させ、昇圧はコイル
を使う方式のため、コンデンサとゲート回路で行う方式
に比べ高い電圧を高い効率で動作させることができる。Further, although power consumption is important in a small portable device, in the present invention, driving a piezoelectric body uses glass as a sounding body to improve the sounding efficiency and increase the boosting circuit without increasing the number of circuit elements. Since the voltage is boosted using a coil, a higher voltage can be operated with higher efficiency as compared with a method using a capacitor and a gate circuit.
【図１】発音体付き液晶表示装置の実施例を示す横断面
図である。FIG. 1 is a cross-sectional view showing an embodiment of a liquid crystal display device with a sounding body.
【図２】発音体付き液晶表示装置の実施例を示す下平面
図である。FIG. 2 is a bottom plan view showing an embodiment of a liquid crystal display device with a sounding body.
【図３】発音体付き液晶表示装置の実施例を示す縦断面
図である。FIG. 3 is a longitudinal sectional view showing an embodiment of a liquid crystal display device with a sounding body.
【図４】液晶駆動用ＩＣの実施例を示すブロック図であ
る。FIG. 4 is a block diagram showing an embodiment of a liquid crystal driving IC.
【図５】昇圧回路の実施例を示す接続図である。FIG. 5 is a connection diagram illustrating an embodiment of a booster circuit.
【図６】昇圧回路の信号の実施例を示すタイミング図で
ある。FIG. 6 is a timing chart showing an embodiment of a signal of a booster circuit.
１ 上ガラス ２ 下ガラス ４ 液晶駆動用ＩＣ ５ 昇圧コイル ６ 圧電素子 ８ 昇圧用ＩＣ ９ 支持体 REFERENCE SIGNS LIST 1 upper glass 2 lower glass 4 liquid crystal driving IC 5 step-up coil 6 piezoelectric element 8 step-up IC 9 support
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｈ０４Ｎ 5/66 １０２ Ｇ１０Ｋ 9/12 １０１Ａ １０１Ｆ (56)参考文献 特開 平７−153569（ＪＰ，Ａ) 特開 昭54−9671（ＪＰ，Ａ) 特開 昭59−47853（ＪＰ，Ａ) 特開 昭62−131697（ＪＰ，Ａ) 実開 昭55−82900（ＪＰ，Ｕ) 実開 平２−38897（ＪＰ，Ｕ) 実開 平２−142872（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G09F 9/00 ──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. 7 Identification symbol FI H04N 5/66 102 G10K 9/12 101A 101F (56) References JP-A-7-153569 (JP, A) JP-A-54- 9671 (JP, A) JP-A-59-47853 (JP, A) JP-A-62-131697 (JP, A) JP-A-55-82900 (JP, U) JP-A-2-38897 (JP, U) Hikaru 2-142872 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) G09F 9/00
Claims (6)
のガラス基板を備えるとともに、前記ガラス基板の一方
は他方より外形が大きく出っ張り部を有し、 前記出っ張り部の上に、圧電素子、圧電素子駆動用回路
素子、及び、液晶駆動用回路素子を備えることを特徴と
する 発音体付き液晶表示装置。1. Two upper and lower sheets opposed to each other across a liquid crystal material
A glass substrate, and one of the glass substrates
Has a protrusion that is larger in outer shape than the other, and has a piezoelectric element and a piezoelectric element driving circuit on the protrusion.
And a circuit element for driving a liquid crystal.
Sounding body with a liquid crystal display device.
路と発音体を駆動するための駆動回路を同一ガラス面に
実装し、かつ両者の昇圧のためのコイルを兼用とした請
求項１記載の発音体付き液晶表示装置。2. A boosting circuit for obtaining a power supply for driving a liquid crystal and a driving circuit for driving a sounding body are mounted on the same glass surface, and a coil for boosting both is used. Liquid crystal display device with sounding body.
有するとともに、該出っ張り部に該出っ張り部を発音さ
せるための圧電素子と、該圧電素子を駆動する昇圧素子
と、該昇圧素子の出力電圧を電源として動作し前記液晶
パネルを駆動する液晶駆動用回路素子とが設けられてい
ることを特徴とする発音体付き液晶表示装置。3. A piezoelectric element for causing one of the substrates of the liquid crystal panel to have a protrusion, causing the protrusion to sound the protrusion, a booster for driving the piezoelectric element, and an output voltage of the booster. A liquid crystal display device with a sounding body, comprising: a circuit element for driving the liquid crystal panel, the circuit element being operated by using the liquid crystal panel as a power supply.
ルに接続される昇圧ＩＣとからなることを特徴とする請
求項３に記載の発音体付き液晶表示装置。4. The liquid crystal display device with a sounding body according to claim 3, wherein the boosting element comprises a boosting coil and a boosting IC connected to the boosting coil.
有し、該出っ張り部に圧電素子と、該圧電素子の駆動素
子とを設け、該駆動素子により前記圧電素子に可聴領域
周波数の断続信号を印加することにより前記出っ張り部
を発音させることを特徴とする発音体付き液晶表示装
置。5. One of the substrates of the liquid crystal panel has a protruding portion, and the protruding portion is provided with a piezoelectric element and a driving element for the piezoelectric element. A liquid crystal display device with a sounding body, characterized in that the protrusion is made to sound by applying the following.
部分を両側からガラス中心に向かって圧縮固定する支持
体が設けられていることを特徴とする請求項５に記載の
発音体付き液晶表示装置。6. A liquid crystal display device with a sounding body according to claim 5, wherein a support is provided for compressing and fixing a portion of the liquid crystal panel having no protrusion from both sides toward the center of the glass. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26462996A JP3160206B2 (en) | 1996-10-04 | 1996-10-04 | Liquid crystal display with sounding body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26462996A JP3160206B2 (en) | 1996-10-04 | 1996-10-04 | Liquid crystal display with sounding body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10111659A JPH10111659A (en) | 1998-04-28 |
| JP3160206B2 true JP3160206B2 (en) | 2001-04-25 |
Family
ID=17406005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26462996A Expired - Fee Related JP3160206B2 (en) | 1996-10-04 | 1996-10-04 | Liquid crystal display with sounding body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3160206B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003131220A (en) * | 2001-10-24 | 2003-05-08 | Seiko Epson Corp | Liquid crystal display device and electronic instrument |
| GB0205860D0 (en) * | 2002-03-13 | 2002-04-24 | Koninkl Philips Electronics Nv | Battery operated device with display |
| JP3916161B2 (en) | 2004-01-06 | 2007-05-16 | 日本アイ・ビー・エム株式会社 | Liquid crystal display device and liquid crystal cell |
| JP2005292395A (en) * | 2004-03-31 | 2005-10-20 | Pioneer Electronic Corp | Low-profile display device |
| JP4924487B2 (en) * | 2007-12-14 | 2012-04-25 | カシオ計算機株式会社 | Radio wave receiver |
| JP5003538B2 (en) * | 2008-03-07 | 2012-08-15 | カシオ計算機株式会社 | Radio wave receiver |
-
1996
- 1996-10-04 JP JP26462996A patent/JP3160206B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10111659A (en) | 1998-04-28 |
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