JPH0383018A - Liquid crystal display device - Google Patents

Liquid crystal display device

Info

Publication number
JPH0383018A
JPH0383018A JP22120689A JP22120689A JPH0383018A JP H0383018 A JPH0383018 A JP H0383018A JP 22120689 A JP22120689 A JP 22120689A JP 22120689 A JP22120689 A JP 22120689A JP H0383018 A JPH0383018 A JP H0383018A
Authority
JP
Japan
Prior art keywords
liquid crystal
crystal display
driving
input
voltage
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
Application number
JP22120689A
Other languages
Japanese (ja)
Inventor
Tomotoshi Satou
知稔 佐藤
Yuichi Yoshida
裕一 吉田
Makoto Takeda
信 竹田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP22120689A priority Critical patent/JPH0383018A/en
Priority to KR1019890020255A priority patent/KR910005079A/en
Priority to EP19890313719 priority patent/EP0376759A3/en
Publication of JPH0383018A publication Critical patent/JPH0383018A/en
Pending legal-status Critical Current

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  • Liquid Crystal (AREA)

Abstract

PURPOSE:To prevent the power source voltage to be impressed to the power source terminal of an IC for driving a liquid crystal from dropping below the voltage of the input signal applied to an input terminal by forming resistors in the wiring patterns to the terminals of the liquid crystal display device mounted with the IC for driving the liquid crystal on a liquid crystal display panel. CONSTITUTION:A part 10 for mounting the IC for driving the liquid crystal is provided near the liquid crystal display part 2 on the liquid crystal display panel 1. The wiring patterns 14b connected to the input terminal of the IC for driving the liquid crystal are formed of a material having the specific resistance higher than the specific resistance of the other wiring pattern materials to constitute the resistors 16 for protecting the excess input. The resistances are formed as the wiring patterns to the IC for driving the liquid crystal even if the drop of the power source terminal voltage by the increase of the connection resistance of the IC for driving the liquid crystal, etc., arises and, therefore, the input terminal voltage is prevented from rising above the power source terminal voltage by the voltage drop arising from the resistors. The generation of the operation defect of the IC for driving the liquid crystal by the excess input is, therefore, prevented.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、液晶表示パネル上に液晶表示駆動用ICが搭
載されている液晶表示装置の改良1こ関し、特に、液晶
駆動用rcの端子への配線/fターン部分の改良に関す
る。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a liquid crystal display device in which a liquid crystal display driving IC is mounted on a liquid crystal display panel. Regarding improvements to the wiring/f-turn portion.

(従来の技術) 液晶表示装置に於ては、液晶駆動用ICを液晶表示パネ
ル外のプリント回路基板上に搭載し、接続導電部を有す
る熱可塑性ヒートシール材等を用いて液晶駆動用ICの
端子と液晶表示パネルの各端子を接続したり、あるいは
、TAB−ICを用いて液晶駆動用ICの端子を液晶表
示パネルの各端子に異方導電フィルム等により接続して
いた。
(Prior Art) In a liquid crystal display device, a liquid crystal driving IC is mounted on a printed circuit board outside the liquid crystal display panel, and the liquid crystal driving IC is mounted on a printed circuit board outside the liquid crystal display panel, and the liquid crystal driving IC is mounted on a printed circuit board outside the liquid crystal display panel. The terminals are connected to each terminal of a liquid crystal display panel, or the terminals of a liquid crystal driving IC are connected to each terminal of a liquid crystal display panel using an anisotropic conductive film or the like using TAB-IC.

他方、ドブトマトリクス方式の°液晶表示装置が開発さ
れ、さらに近年に至り、画素数の増加、高精細化にとも
なって、接続端子数が急速に増加し、それに伴い、接続
端子間ピッチが細かくなってきた。その結果、液晶表示
パネルと液晶駆動用ICとの接続が非常に困難となって
きた。そこで、導電性接着剤や光硬化型樹脂を用いて、
液晶駆動用ICを液晶表示パネル上に搭載する方式、い
わゆるCOG (Ch I p−0n−Gl a s 
s)方式の液晶表示装置が開発され、使用されている。
On the other hand, with the development of Dobutmatrix-type liquid crystal display devices, and in recent years, the number of connection terminals has rapidly increased as the number of pixels and resolution have increased, and the pitch between the connection terminals has become finer. It has become. As a result, it has become extremely difficult to connect a liquid crystal display panel and a liquid crystal driving IC. Therefore, using conductive adhesive and photocurable resin,
A method of mounting a liquid crystal drive IC on a liquid crystal display panel, the so-called COG (Ch Ip-On-Glass)
s) type liquid crystal display devices have been developed and are in use.

(発明が解決しようとする課題) しかしながら、上述の従来技術においては、以下に述べ
る問題点があった。
(Problems to be Solved by the Invention) However, the above-mentioned conventional technology has the following problems.

導電性接着剤や光硬化型樹脂を用いて、液晶駆動用IC
を液晶表示パネル上に搭載する方式の液晶表示装置には
、その液′高部動用ICが動作不良を起こしやすいとい
う欠点がある。これは、液晶駆動用ICの電源端子と液
晶表示パネル上配線との接続部において、その接続抵抗
が非常に高くなることがあるためである。このような接
続不良が生じると、増加した接続抵抗による電圧降下の
ために、液晶駆動用ICの電源端子に加えられる電源電
圧が、入力端子に加えられる入力信号よりも低下してし
まうことがある。液晶駆動用ICの電源端子を流れる電
流は、入力端子を流れる電流よりも多いので、電源端子
側での抵抗による電圧降下は、入力端子側での電圧降下
より大きなものとなる。電源電圧よりも電圧レベルの高
い入力信号(過大入力)が液晶駆動用ICの入力端子に
加えられると、液晶駆動用ICの動作が不安定になる。
LCD driving IC using conductive adhesive or photocurable resin
A liquid crystal display device in which a liquid crystal display device is mounted on a liquid crystal display panel has a drawback in that its liquid crystal high-level operation IC is likely to malfunction. This is because the connection resistance at the connection between the power supply terminal of the liquid crystal driving IC and the wiring on the liquid crystal display panel may become extremely high. When such a connection failure occurs, the power supply voltage applied to the power supply terminal of the liquid crystal driving IC may become lower than the input signal applied to the input terminal due to a voltage drop due to the increased connection resistance. . Since the current flowing through the power supply terminal of the liquid crystal driving IC is larger than the current flowing through the input terminal, the voltage drop due to the resistance on the power supply terminal side is larger than the voltage drop on the input terminal side. When an input signal having a voltage level higher than the power supply voltage (excessive input) is applied to the input terminal of the liquid crystal driving IC, the operation of the liquid crystal driving IC becomes unstable.

また、一つの液晶駆動用rcが過大入力等によって不良
となってしまった場合、その出力端子と他の正常なIC
とがカスケード線や共通人力線によって互いに接続され
ているため、不良ICの信号レベルが、他の正常な1C
に対して、過大入力となってしまうことがある。このた
め、これらの正常な液晶駆動用ICが次々に不良化して
しまうという問題があった。
In addition, if one LCD drive RC becomes defective due to excessive input, etc., its output terminal and other normal ICs
are connected to each other by a cascade line or a common power line, so the signal level of the defective IC is higher than that of other normal 1C.
However, excessive input may occur. Therefore, there has been a problem in that these normal liquid crystal driving ICs become defective one after another.

本発明は上記課題を解決するためになされたものであり
、その目的とするところは、液晶駆動用ICの電源端子
に加えられる電源電圧が、入力端子に加えられる入力信
号の電圧よりも低下してしまうことのない液晶表示装置
を提供することにある。
The present invention has been made to solve the above problems, and its purpose is to reduce the power supply voltage applied to the power supply terminal of a liquid crystal driving IC to be lower than the voltage of the input signal applied to the input terminal. An object of the present invention is to provide a liquid crystal display device that does not get damaged.

本発明の他の目的は、一つの液晶駆動用ICが不良とな
っても、その不良ICの信号レベルが、その不良ICの
出力端子とカスケード線や共通入力線によって接続され
た他の正常なICに対して、過大入力とならず、正常な
液晶駆動用ICが損なわれない液晶表示装置を提供する
ことにある。
Another object of the present invention is that even if one liquid crystal driving IC becomes defective, the signal level of the defective IC will be lowered by the output terminal of the defective IC and other normal signals connected by a cascade line or a common input line. It is an object of the present invention to provide a liquid crystal display device that does not cause excessive input to an IC and does not damage a normal liquid crystal driving IC.

(課題を解決するための手段) 本発明は、液晶表示パネル上に液晶駆動用ICが搭載さ
れた液晶表示装置であって、 該液晶駆動用ICの端子への配線パターンに抵抗が形成
されており、そのことにより上記目的が達成される。
(Means for Solving the Problems) The present invention is a liquid crystal display device in which a liquid crystal driving IC is mounted on a liquid crystal display panel, and a resistance is formed in a wiring pattern to a terminal of the liquid crystal driving IC. This achieves the above objective.

また、前記抵抗が透明導′1t&膜によって形成されて
いても良い。
Further, the resistor may be formed of a transparent conductive film.

(実施例) 以下に本発明を実施例について説明する。(Example) The present invention will be described below with reference to Examples.

第1図は本発明の一実施例を示す平面図である。FIG. 1 is a plan view showing one embodiment of the present invention.

液晶表示パネル1上に於て、液晶表示部2の近傍に液晶
駆動用IC搭載部10が設けられている。
On the liquid crystal display panel 1, a liquid crystal driving IC mounting part 10 is provided near the liquid crystal display part 2.

液晶駆動用IC搭載部10の周囲に、液晶駆動用rc(
不図示)の端子と接続される各接続部11.12.13
及び配線パターン14a、14b、14cが形成されて
いる。この内、接続部11は液晶駆動用ICの出力端子
に接続されるものであり、配線パターン14eにより液
晶表示部2に電気的に接続されている。接続部12は、
液晶駆動用ICの電源端子に接続されるものであり、外
部の電源回路と電気的に接続される接続部15aに配線
パターン14aを介して接続されている。また、接続部
13は、液晶駆動用ICの入力端子に接続されるもので
あり、外部の制御回路等と電気的に接続される接続部1
5bに配線パターン14bを介して接続されている。
A liquid crystal driving rc (
Each connection part 11.12.13 connected to a terminal (not shown)
And wiring patterns 14a, 14b, and 14c are formed. Of these, the connection section 11 is connected to the output terminal of the liquid crystal driving IC, and is electrically connected to the liquid crystal display section 2 through a wiring pattern 14e. The connection part 12 is
It is connected to the power supply terminal of the liquid crystal driving IC, and is connected via a wiring pattern 14a to a connection portion 15a that is electrically connected to an external power supply circuit. Further, the connection part 13 is connected to the input terminal of the liquid crystal driving IC, and the connection part 13 is electrically connected to an external control circuit, etc.
5b via a wiring pattern 14b.

本実施例の特徴は、液晶駆動用ICの入力端子に接続さ
れる配線パターンi4bが、他の配線パターンの材料よ
りも比抵抗の高い材料によって形成され、これによって
、過大入力保護用の抵抗16を構成したことにある。
The feature of this embodiment is that the wiring pattern i4b connected to the input terminal of the liquid crystal driving IC is formed of a material having a higher specific resistance than the material of the other wiring patterns, and as a result, the resistor 16 for over-input protection The reason lies in the fact that it has been constructed.

この過大入力保護用抵抗i6の材料としては、液晶表示
部の絵素電極材料と同じITO等の透明導電膜が好適で
ある。この透明導電膜は比抵抗が高く、また、スパッタ
リング法等によって液晶表示パネル上に容易に形成され
、フォトエツチングによって任意の形状にバターニング
されるため、配線パターンとして抵抗を構成するのに適
している。この保護用抵抗16に絵素電極と同じ材料を
用いることにより、液晶表示部の絵素電極形成と同時に
、保護用抵抗16を形成することができ、液晶表示パネ
ルの製造工程数が増加しないという利点がある。
A suitable material for this excessive input protection resistor i6 is a transparent conductive film such as ITO, which is the same material as the picture element electrode material of the liquid crystal display section. This transparent conductive film has a high specific resistance, and can be easily formed on a liquid crystal display panel by sputtering, etc., and can be patterned into any shape by photoetching, making it suitable for forming a resistor as a wiring pattern. There is. By using the same material as the picture element electrode for the protective resistor 16, the protective resistor 16 can be formed at the same time as the picture element electrode of the liquid crystal display section, and the number of manufacturing steps for the liquid crystal display panel does not increase. There are advantages.

保護用抵抗16の抵抗値は、予憇される最大の入力レベ
ルが保護用抵抗16の接続部15b側に加えられた場合
に、保護用抵抗16による電圧降下によって入力レベル
の電圧が低下し、液晶駆動用ICの入力端子に於て、そ
の電源端子での予想される最低の1!f!Ait;圧よ
りも低くなるように設定される。この電圧降下の大きさ
は、保護用抵抗16の抵抗値と、保護用抵抗16を流れ
る電流値、すなわち液晶駆動用ICの入力端子を流れる
電流値との積として求めることができる。このことから
、該抵抗値が大きいほど、入力端子電圧を低くすること
ができる。また、電源端子電位が低下した場合に、入力
端子を流れる電流値を増加させる回路が液晶駆動用IC
内に設けられていれば、保護用抵抗16による電圧降下
は更に大きくなり、過大入力がいっそう効果的に防止さ
れる。
The resistance value of the protective resistor 16 is such that when the expected maximum input level is applied to the connection portion 15b side of the protective resistor 16, the input level voltage decreases due to the voltage drop due to the protective resistor 16. At the input terminal of the liquid crystal driving IC, the lowest expected value at the power supply terminal is 1! f! Ait: Set to be lower than the pressure. The magnitude of this voltage drop can be determined as the product of the resistance value of the protective resistor 16 and the current value flowing through the protective resistor 16, that is, the current value flowing through the input terminal of the liquid crystal driving IC. From this, the larger the resistance value, the lower the input terminal voltage can be. In addition, when the power supply terminal potential decreases, the circuit that increases the current value flowing through the input terminal is a liquid crystal driving IC.
If the protective resistor 16 is provided inside the protective resistor 16, the voltage drop due to the protective resistor 16 will be further increased, and excessive input can be prevented even more effectively.

また、同様にして、一つの液晶駆動用ICが不良となっ
ても、その不良ICの信号レベルが、その不良rcの出
力端子にカスケード線や共通入力線によって接続された
他の正常なICに対して、過大入力として加わることが
防止される。このため、正常な液晶駆動用ICが連鎖的
に損なわれてしまうことがない。
Similarly, even if one liquid crystal driving IC becomes defective, the signal level of that defective IC will be transmitted to other normal ICs connected to the output terminal of the defective RC via a cascade line or a common input line. On the other hand, excessive input is prevented. Therefore, a normal liquid crystal driving IC will not be damaged in a chain reaction.

このように、本実施例では、保護用抵抗16が配線パタ
ーンとして構成されているために、液晶駆動用rcの動
作が、過大入力によって不良となってしまうことが防止
された。
In this way, in this embodiment, since the protective resistor 16 is configured as a wiring pattern, the operation of the liquid crystal driving rc is prevented from becoming defective due to excessive input.

上記実施例では、配線パターンとして入力端子に接続さ
れる部分に抵抗を形成したが、同様の抵抗を、iii源
端子端子続される配線パターン14aに形成することが
できる。この抵抗を設ける目的は、iI電源端子流れる
電流レベルを低下させ、液晶駆動用ICがラッチアップ
状態を保持しないようにすることである。従って、その
抵抗値としては、う、ノチアップ状態が保持されない程
度の大きさが必要である。ただし、その抵抗値が大きす
ぎると、抵抗による電圧降下が74源端子での電源電圧
を著しく低下させ、過大入力状態となってしまう。その
ため、その抵抗値は、前記過大入力保護用抵抗の抵抗値
よりも充分低く設定されなければならない。なお、上記
抵抗と前記過大入力保護用抵抗とが、共に配線バグーン
として表示パネル上に形成されていても良い。
In the above embodiment, a resistor is formed in the wiring pattern connected to the input terminal, but a similar resistance can be formed in the wiring pattern 14a connected to the source terminal iii. The purpose of providing this resistor is to reduce the level of current flowing through the iI power supply terminal so that the liquid crystal driving IC does not remain in a latch-up state. Therefore, the resistance value needs to be large enough to prevent the notch-up state from being maintained. However, if the resistance value is too large, the voltage drop caused by the resistance will significantly reduce the power supply voltage at the 74 source terminal, resulting in an excessive input state. Therefore, its resistance value must be set sufficiently lower than the resistance value of the excessive input protection resistor. Note that both the above-mentioned resistor and the above-mentioned excessive input protection resistor may be formed on the display panel as a wiring bagoon.

(発明の効果) このように、本発明では、液晶駆動用ICの接続抵抗増
加等による電源端子電圧の低下が起こっても、該液晶駆
動用ICへの配線パターンとして抵抗が形成されている
ため、該抵抗による電圧降下によって、入力端子電圧が
電源端子電圧よりも高くなることがない。このため、過
大入力による該液晶駆動用ICの動作不良発生が抑制さ
れる。
(Effects of the Invention) As described above, in the present invention, even if the power supply terminal voltage decreases due to an increase in connection resistance of the liquid crystal driving IC, the resistance is formed as a wiring pattern to the liquid crystal driving IC. , the input terminal voltage does not become higher than the power supply terminal voltage due to the voltage drop caused by the resistor. Therefore, occurrence of malfunction of the liquid crystal driving IC due to excessive input is suppressed.

また、一つの液晶駆動用ICが動作不良を起こしても、
これを原因とする過大入力が、共通入力線等を介して他
の正常な液晶駆動用ICに加えられることがなく、連鎖
的な不良の発生が防がれる。
In addition, even if one LCD drive IC malfunctions,
Excessive input caused by this will not be applied to other normal liquid crystal driving ICs via the common input line, etc., and chain failures can be prevented from occurring.

また、該抵抗が液晶表示部の絵素電極と同じ透明導電膜
であることにより、該抵抗は液晶表示部の絵素電極の形
成と同時に形成されることが可能となり、液晶表示パネ
ルの製造工程数が増加しないという利点がある。
In addition, since the resistor is the same transparent conductive film as the pixel electrode of the liquid crystal display section, the resistor can be formed at the same time as the pixel electrode of the liquid crystal display section, so that it can be formed during the manufacturing process of the liquid crystal display panel. It has the advantage that the number does not increase.

また、液晶表示パネル上lこ、電源端子に接続される配
線パターンとして抵抗を設けることにより、液晶駆動用
ICのラフチアツブが防止される。
Further, by providing a resistor as a wiring pattern connected to the power supply terminal on the liquid crystal display panel, ruff-up of the liquid crystal driving IC can be prevented.

従って、液晶駆動用rcの誤動作や表示不良の生じがた
い信頼性に優れた高品質の液晶表示装置を得ることがで
きる。
Therefore, it is possible to obtain a highly reliable, high-quality liquid crystal display device in which malfunctions of the liquid crystal driving RC and display defects are unlikely to occur.

4、     の   な! 日 第1図は本発明の一実施例の要部を示す略図的平面図で
ある。
4. Don't worry! FIG. 1 is a schematic plan view showing essential parts of an embodiment of the present invention.

1・・・液晶表示パネル、2・・・液晶表示部、10・
・・液晶駆動用IC搭載部、11.12.13.15a
115 b−・・接続部、14a、14b、 14cm
配線パターン、16・・・過大入力保護用抵抗。
DESCRIPTION OF SYMBOLS 1...Liquid crystal display panel, 2...Liquid crystal display part, 10.
・LCD drive IC mounting part, 11.12.13.15a
115 b--Connection part, 14a, 14b, 14cm
Wiring pattern, 16... Resistor for excessive input protection.

以上that's all

Claims (1)

【特許請求の範囲】 1、液晶表示パネル上に液晶駆動用ICが搭載された液
晶表示装置であって、 該液晶駆動用ICの端子への配線パターンに抵抗が形成
されている液晶表示装置。 2、前記抵抗が透明導電膜によって形成されている請求
項1に記載の液晶表示装置。
[Claims] 1. A liquid crystal display device in which a liquid crystal driving IC is mounted on a liquid crystal display panel, and a resistance is formed in a wiring pattern to a terminal of the liquid crystal driving IC. 2. The liquid crystal display device according to claim 1, wherein the resistor is formed of a transparent conductive film.
JP22120689A 1988-12-29 1989-08-28 Liquid crystal display device Pending JPH0383018A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP22120689A JPH0383018A (en) 1989-08-28 1989-08-28 Liquid crystal display device
KR1019890020255A KR910005079A (en) 1988-12-29 1989-12-29 LCD Display
EP19890313719 EP0376759A3 (en) 1988-12-29 1989-12-29 Liquid crystal display apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22120689A JPH0383018A (en) 1989-08-28 1989-08-28 Liquid crystal display device

Publications (1)

Publication Number Publication Date
JPH0383018A true JPH0383018A (en) 1991-04-09

Family

ID=16763129

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22120689A Pending JPH0383018A (en) 1988-12-29 1989-08-28 Liquid crystal display device

Country Status (1)

Country Link
JP (1) JPH0383018A (en)

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