JPH08248389A - Display panel - Google Patents

Display panel

Info

Publication number
JPH08248389A
JPH08248389A JP7709095A JP7709095A JPH08248389A JP H08248389 A JPH08248389 A JP H08248389A JP 7709095 A JP7709095 A JP 7709095A JP 7709095 A JP7709095 A JP 7709095A JP H08248389 A JPH08248389 A JP H08248389A
Authority
JP
Japan
Prior art keywords
thin film
film transistor
electrode
liquid crystal
pixel
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
JP7709095A
Other languages
Japanese (ja)
Inventor
Hidetsugu Kojima
英嗣 小島
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.)
Casio Computer Co Ltd
Original Assignee
Casio Computer Co Ltd
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 Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Priority to JP7709095A priority Critical patent/JPH08248389A/en
Publication of JPH08248389A publication Critical patent/JPH08248389A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1306Details
    • G02F1/1309Repairing; Testing
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50Protective arrangements
    • G02F2201/506Repairing, e.g. with redundant arrangement against defective part
    • G02F2201/508Pseudo repairing, e.g. a defective part is brought into a condition in which it does not disturb the functioning of the device

Abstract

PURPOSE: To convert light points into dark points which are difficult to visually recognize without any tailoring in an active matrix type liquid crystal display device when a thin film transistor is brought into an open condition due to product defects. CONSTITUTION: A common electrode 24 which is the electrode on the side that is not connected to a thin film transistor 7 of a pixel capacity section 31 is connected to a low power source 41, and an auxiliary capacity line 9 which is the electrode on the side not connected to the thin film transistor 7 of an auxiliary capacity section 32 is connected to a high power source 42. When the thin film transistor 7 is brought into an open condition due to product defects, the case is the same as that where the pixel capacity section 31 and the auxiliary capacity section 32 are connected in series between the two voltage sources. Through this, the liquid crystal corresponding to the thin film transistor 7 in the open condition can be driven and brought into a shaded condition.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明はアクティブマトリック
ス型液晶表示装置などにおける表示パネルに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel in an active matrix type liquid crystal display device or the like.

【0002】[0002]

【従来の技術】例えばアクティブマトリックス型液晶表
示装置には、画素データに対応する容量を蓄積する容量
素子として、画素容量部のほかに補助容量部を備えたも
のがある。図2および図3は従来のこのようなアクティ
ブマトリックス型液晶表示装置における表示パネルの一
部を示したものである。ただし、図2はこの表示パネル
における表示駆動パネル1のうち最上層の配向膜19を
省略した状態の平面図を示す。この表示パネルでは、表
示駆動パネル1と共通電極パネル2とが図示しないシー
ル材を介して貼り合わされ、その間に液晶3が封入され
た構造となっている。
2. Description of the Related Art For example, an active matrix type liquid crystal display device includes one having an auxiliary capacitance section in addition to a pixel capacitance section as a capacitance element for accumulating a capacitance corresponding to pixel data. 2 and 3 show a part of a display panel in such a conventional active matrix type liquid crystal display device. However, FIG. 2 shows a plan view of the display drive panel 1 in this display panel in a state in which the uppermost alignment film 19 is omitted. This display panel has a structure in which the display drive panel 1 and the common electrode panel 2 are bonded together via a sealing material (not shown), and the liquid crystal 3 is sealed between them.

【0003】表示駆動パネル1は、ガラス基板4上に走
査ライン(ゲートライン)5と信号ライン(ドレインラ
イン)6がマトリックス状に設けられ、その各交点近傍
に薄膜トランジスタ(スイッチング素子)7および画素
電極8が設けられ、また画素電極8を挾んで走査ライン
5とは反対側に補助容量ライン9が設けられた構造とな
っている。
In the display drive panel 1, scan lines (gate lines) 5 and signal lines (drain lines) 6 are provided in a matrix on a glass substrate 4, and thin film transistors (switching elements) 7 and pixel electrodes are provided near each intersection. 8 is provided, and an auxiliary capacitance line 9 is provided on the opposite side of the scanning line 5 across the pixel electrode 8.

【0004】すなわち、ガラス基板4の上面の所定の個
所にはゲート電極11を含む走査ライン5が形成され、
他の所定の個所には補助容量ライン9が形成され、その
上面全体にはゲート絶縁膜12が形成されている。ゲー
ト絶縁膜12の上面の所定の個所にはアモルファスシリ
コンからなる半導体薄膜13が形成され、半導体薄膜1
3の上面の中央部にはチャネル保護膜14が形成されて
いる。半導体薄膜13およびチャネル保護膜14の上面
の両側にはn+シリコンからなるコンタクト層15、1
6が形成され、コンタクト層15、16の上面にはドレ
イン電極17およびソース電極18が形成され、またこ
れら電極17、18の形成と同時に信号ライン6が形成
されている。ゲート絶縁膜12の上面の所定の個所には
ITOからなる画素電極8がソース電極18に接続され
て形成されている。そして、全上面には配向膜19が形
成されている。
That is, the scanning line 5 including the gate electrode 11 is formed at a predetermined position on the upper surface of the glass substrate 4.
An auxiliary capacitance line 9 is formed at another predetermined position, and a gate insulating film 12 is formed on the entire upper surface thereof. A semiconductor thin film 13 made of amorphous silicon is formed at a predetermined position on the upper surface of the gate insulating film 12, and the semiconductor thin film 1
A channel protection film 14 is formed in the central portion of the upper surface of 3. On both sides of the upper surfaces of the semiconductor thin film 13 and the channel protective film 14, contact layers 15 made of n + silicon are provided.
6 is formed, the drain electrode 17 and the source electrode 18 are formed on the upper surfaces of the contact layers 15 and 16, and the signal line 6 is formed at the same time when these electrodes 17 and 18 are formed. A pixel electrode 8 made of ITO is connected to a source electrode 18 at a predetermined position on the upper surface of the gate insulating film 12. An alignment film 19 is formed on the entire upper surface.

【0005】補助容量ライン9は、ITOからなり、画
素電極8の上辺部に対応する位置において走査ライン5
と平行して設けられている。そして、補助容量ライン9
の所定の部分は画素電極8の上辺部と重ね合わされ、こ
の重ね合わされた部分によって補助容量部が形成されて
いる。
The auxiliary capacitance line 9 is made of ITO, and the scanning line 5 is located at a position corresponding to the upper side of the pixel electrode 8.
It is provided in parallel with. And the auxiliary capacitance line 9
A predetermined portion of the pixel electrode 8 is overlapped with the upper side portion of the pixel electrode 8, and the overlapped portion forms an auxiliary capacitance portion.

【0006】一方、共通電極パネル2はガラス基板21
を備えている。ガラス基板21の下面の各所定の個所に
はブラックマスク22およびカラーフィルタ23が形成
されている。ブラックマスク22およびカラーフィルタ
23の下面にはITOからなる共通電極24が形成さ
れ、共通電極24の下面には配向膜25が形成されてい
る。そして、画素電極8とこれに対向配置された共通電
極24とその間の液晶3とによって画素容量部が形成さ
れている。
On the other hand, the common electrode panel 2 has a glass substrate 21.
It has. A black mask 22 and a color filter 23 are formed at predetermined locations on the lower surface of the glass substrate 21. A common electrode 24 made of ITO is formed on the lower surfaces of the black mask 22 and the color filter 23, and an alignment film 25 is formed on the lower surface of the common electrode 24. A pixel capacitance portion is formed by the pixel electrode 8, the common electrode 24 arranged to face the pixel electrode 8, and the liquid crystal 3 therebetween.

【0007】次に、図4は以上のような表示パネルの等
価回路を示したものである。符号31は画素容量部、3
2は補助容量部、33は薄膜トランジスタ7のゲート電
極11とソース電極18との間の寄生容量部、34は走
査ライン5と画素電極8との間の寄生容量部を示す。こ
の場合、画素容量部31の薄膜トランジスタ7に接続さ
れない側の電極である共通電極24と、補助容量部32
の薄膜トランジスタ7に接続されない側の電極である補
助容量ライン9は、共通電源(電圧VCOM)35に接続
されている。
Next, FIG. 4 shows an equivalent circuit of the display panel as described above. Reference numeral 31 is a pixel capacitor portion, 3
Reference numeral 2 is an auxiliary capacitance portion, 33 is a parasitic capacitance portion between the gate electrode 11 and the source electrode 18 of the thin film transistor 7, and 34 is a parasitic capacitance portion between the scanning line 5 and the pixel electrode 8. In this case, the common electrode 24, which is the electrode of the pixel capacitor 31 that is not connected to the thin film transistor 7, and the auxiliary capacitor 32.
The auxiliary capacitance line 9 which is an electrode on the side not connected to the thin film transistor 7 is connected to the common power source (voltage V COM ) 35.

【0008】次に、図5(a)はフィールド反転駆動方
式の場合に液晶3に印加される電圧の波形を示し、図5
(b)は走査ライン5に印加される走査信号を示したも
のである。そして、画素容量部31の容量をCLCとし、
補助容量部32の容量をCSとし、寄生容量部33、3
4の合計容量をCGSとし、ゲートパルスのハイレベルと
ローレベルの電位差をVGHLとすると、ゲートパルスが
オフするときに、次の(1)式で求められる飛び込み電
圧ΔVが生じる。 ΔV=(CGS・VGHL)/(CLC+CS+CGS)……(1)
Next, FIG. 5A shows the waveform of the voltage applied to the liquid crystal 3 in the case of the field inversion driving method.
(B) shows a scanning signal applied to the scanning line 5. Then, the capacitance of the pixel capacitance unit 31 is C LC ,
Let C S be the capacitance of the auxiliary capacitance section 32, and the parasitic capacitance sections 33, 3
Assuming that the total capacitance of 4 is C GS and the potential difference between the high level and the low level of the gate pulse is V GHL , when the gate pulse is turned off, a jump voltage ΔV obtained by the following equation (1) is generated. ΔV = (C GS · V GHL ) / (C LC + C S + C GS ) …… (1)

【0009】この飛び込み電圧ΔVは、信号電圧の極性
に関係なく、常に画素電極電位をΔVだけ下げることに
なる。そこで、共通電極24の電位VCOMを信号ライン
6の中心電位VCに対してこの飛び込み電圧ΔVの分だ
け低く設定すると、液晶3に印加される電圧を正負ほぼ
対称な波形とすることができる。
The jump voltage ΔV always lowers the pixel electrode potential by ΔV regardless of the polarity of the signal voltage. Therefore, when the potential V COM of the common electrode 24 is set lower than the center potential V C of the signal line 6 by the jump voltage ΔV, the voltage applied to the liquid crystal 3 can have a substantially positive and negative symmetrical waveform. .

【0010】ところで、薄膜トランジスタ7が製造欠陥
によりオープン状態となった場合には、それに対応する
画素電極8がフローティング状態となってしまう。する
と、フローティング状態の画素電極8と共通電極24と
の間の液晶3に信号ライン6からの信号電圧が印加され
ず、結果として、この表示パネルがポジ表示のものであ
る場合、フローティング状態の画素電極8の部分が常時
明点となり、画質が低下してしまう。
If the thin film transistor 7 is opened due to a manufacturing defect, the pixel electrode 8 corresponding to the open state will be in a floating state. Then, the signal voltage from the signal line 6 is not applied to the liquid crystal 3 between the pixel electrode 8 in the floating state and the common electrode 24. As a result, when this display panel is for positive display, the pixel in the floating state is The portion of the electrode 8 always becomes a bright spot, and the image quality deteriorates.

【0011】そこで、従来では、まず、所定の製造工程
後に検査を行い、明点欠陥があるか否かを調べ、明点欠
陥がある場合には、それに対応する画素電極8と該画素
電極8に隣接する信号ライン6とを接続し、これにより
フローティング状態の画素電極8に常時信号電圧を印加
し、それに対応する液晶3を駆動して遮光状態とし、こ
れにより明点を明点に比べて視認されにくい暗点に変え
るという方法が考えられている。
Therefore, in the prior art, first, an inspection is performed after a predetermined manufacturing process to check whether or not there is a bright spot defect, and if there is a bright spot defect, the pixel electrode 8 corresponding to the bright spot defect and the pixel electrode 8 concerned. Is connected to the signal line 6 adjacent thereto, and thereby a signal voltage is constantly applied to the pixel electrode 8 in the floating state, and the liquid crystal 3 corresponding thereto is driven to be in the light-shielding state, whereby the bright point is compared with the bright point. A method of changing to a dark spot that is hard to be visually recognized is considered.

【0012】[0012]

【発明が解決しようとする課題】しかしながら、従来の
このような方法では、明点欠陥があるか否かの検査を行
い、明点欠陥がある場合には、明点欠陥ごとに、画素電
極8と該画素電極8に隣接する信号ライン6とを接続し
なければならず、したがって大変な手間がかかるばかり
でなく、コスト高になってしまうという問題があった。
この発明の目的は、何ら手を加えることなく、明点を明
点に比べて視認されにくい暗点に変えることができる表
示パネルを提供することにある。
However, in such a conventional method, it is inspected whether or not there is a bright spot defect, and if there is a bright spot defect, the pixel electrode 8 is formed for each bright spot defect. And the signal line 6 adjacent to the pixel electrode 8 must be connected to each other, so that there is a problem that not only it takes a lot of trouble but also the cost becomes high.
An object of the present invention is to provide a display panel capable of changing a bright spot into a dark spot which is hard to be visually recognized as compared with a bright spot without any modification.

【0013】[0013]

【課題を解決するための手段】この発明は、スイッチン
グ素子に接続され、画素データに対応する容量を蓄積す
る容量素子を有する表示パネルにおいて、前記容量素子
の前記スイッチング素子に接続されない側の電極を、前
記スイッチング素子がオープン状態のときに該スイッチ
ング素子に対応する液晶を駆動して遮光状態とする電源
に接続したものである。
According to the present invention, in a display panel having a capacitive element connected to a switching element and accumulating a capacitance corresponding to pixel data, an electrode on the side of the capacitive element which is not connected to the switching element is provided. When the switching element is in an open state, the liquid crystal corresponding to the switching element is driven to connect to a power source which is in a light shielding state.

【0014】[0014]

【作用】この発明によれば、スイッチング素子がオープ
ン状態となった場合、このオープン状態のスイッチング
素子に対応する液晶が駆動して遮光状態となるので、何
ら手を加えることなく、明点を明点に比べて視認されに
くい暗点に変えることができる。
According to the present invention, when the switching element is in the open state, the liquid crystal corresponding to the switching element in the open state is driven to be in the light shielding state. It can be changed to a dark spot that is less visible than dots.

【0015】[0015]

【実施例】図1(A)はこの発明の一実施例を適用した
表示パネルの等価回路を示したものである。なお、この
図において、図4と同一部分には同一の符号を付し、そ
の説明を適宜省略する。この表示パネルでは、画素容量
部31の薄膜トランジスタ7に接続されない側の電極で
ある共通電極24は低電源(電圧VLCCOM)41に接続
され、補助容量部32の薄膜トランジスタ7に接続され
ない側の電極である補助容量ライン9は高電源(電圧V
SCOM)42に接続されている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A shows an equivalent circuit of a display panel to which an embodiment of the present invention is applied. In this figure, the same parts as those in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted as appropriate. In this display panel, the common electrode 24, which is the electrode of the pixel capacitance section 31 on the side not connected to the thin film transistor 7, is connected to the low power source (voltage V LCCOM ) 41, and the electrode on the side not connected to the thin film transistor 7 of the auxiliary capacitance section 32. A certain auxiliary capacitance line 9 has a high power source (voltage V
SCOM ) 42.

【0016】さて、薄膜トランジスタ7が製造欠陥によ
りオープン状態となった場合には、それに対応する画素
電極8がフローティング状態となる。しかしながら、こ
の場合の等価回路は、図1(B)に示すように、両電源
41、42間に画素容量部31と補助容量部32とが直
列接続された場合と同じとなる。そして、画素容量部3
1の容量をCLCとし、補助容量部32の容量をCS
し、両容量部31、32間の電圧をVSとすると、画素
容量部31および補助容量部32の各電荷QLC、QS
それぞれ次の式(1)および(2)で与えられる。 QLC=CLC(VLCCOM−VS) ……(1) QS=CS(VSCOM−VS) ……(2) この場合、図1(B)に示す回路は直列接続であるの
で、QLC=−QSが成立する。この結果、式(1)およ
び(2)から次の式(3)が求められる。 VS=(CLCLCCOM+CSSCOM)/(CLC+CS) ……(3)
When the thin film transistor 7 is opened due to a manufacturing defect, the pixel electrode 8 corresponding to the thin film transistor 7 is brought into a floating state. However, the equivalent circuit in this case is the same as in the case where the pixel capacitance section 31 and the auxiliary capacitance section 32 are connected in series between the power supplies 41 and 42 as shown in FIG. Then, the pixel capacitor section 3
If the capacitance of 1 is C LC , the capacitance of the auxiliary capacitance section 32 is C S, and the voltage between both capacitance sections 31 and 32 is V S , the respective charges Q LC and Q of the pixel capacitance section 31 and the auxiliary capacitance section 32 are represented. S is given by the following equations (1) and (2), respectively. Q LC = C LC (V LCCOM −V S ) (1) Q S = C S (V SCOM −V S ) (2) In this case, the circuit shown in FIG. 1 (B) is connected in series. Therefore, Q LC = −Q S holds. As a result, the following equation (3) is obtained from the equations (1) and (2). V S = (C LC V LCCOM + C S V SCOM ) / (C LC + C S ) ... (3)

【0017】ここで、薄膜トランジスタ7がオープン状
態となった場合に、それに対応する液晶に印加される電
圧を5〔V〕とすると、次の式(4)が成立する。 5〔V〕=VS−VLCCOM ……(4) 次に、式(3)を式(4)に代入して演算すると、次の
式(5)が求められる。 VSCOM={5〔V〕・(CLC+CS)/CS}+VLCCOM ……(5)
When the voltage applied to the liquid crystal corresponding to the thin film transistor 7 in the open state is 5 [V], the following equation (4) is established. 5 [V] = V S −V LCCOM (4) Next, by substituting the equation (3) into the equation (4), the following equation (5) is obtained. V SCOM = {5 [V] ・ (C LC + C S ) / C S } + V LCCOM ...... (5)

【0018】したがって、薄膜トランジスタ7がオープ
ン状態となった場合に、それに対応する液晶に印加され
る電圧を5〔V〕とすると、高電源42の電圧VSCOM
低電源41の電圧VLCCOMに対して式(5)を満足する
値とすればよいことになる。この結果、薄膜トランジス
タ7がオープン状態となった場合でも、それに対応する
液晶には5〔V〕の電圧が印加されることになり、当該
液晶を駆動して遮光状態とすることができる。この場合
の液晶に印加される電圧は5〔V〕以上であればよい。
したがって、薄膜トランジスタ7がオープン状態となっ
た場合には、それに対応する液晶が駆動して遮光状態と
なるので、何ら手を加えることなく、明点を明点に比べ
て視認されにくい暗点に変えることができ、手間が全く
かからず、コストの低減を図ることが可能となる。
Therefore, when the thin film transistor 7 is in the open state and the voltage applied to the corresponding liquid crystal is 5 [V], the voltage V SCOM of the high power source 42 is compared with the voltage V LCCOM of the low power source 41. Then, a value satisfying the formula (5) should be set. As a result, even when the thin film transistor 7 is in the open state, a voltage of 5 [V] is applied to the liquid crystal corresponding to the thin film transistor 7, and the liquid crystal can be driven to be in the light shielding state. The voltage applied to the liquid crystal in this case may be 5 [V] or more.
Therefore, when the thin film transistor 7 is in the open state, the liquid crystal corresponding to the thin film transistor 7 is driven to be in the light-shielding state, so that the bright point is changed to the dark point which is less visible than the bright point without any modification. Therefore, the cost can be reduced without any trouble.

【0019】なお、薄膜トランジスタ7が正常な場合に
は、画素容量部31および補助容量部の各容量CLC、C
Sの値が共に従来の場合と同じであると、例えば図5に
示すように、ゲートパルスがオフするときに画素電極電
位に生じる飛び込み電圧ΔVの値も従来の場合と同じと
なる。この場合、共通電極24の電位VLCCOMも従来の
場合の電位VCOMと同じとすると、従来の場合とほとん
ど同じ光学特性を得ることができ、何ら問題は生じな
い。
When the thin film transistor 7 is normal, the capacitances C LC and C of the pixel capacitance portion 31 and the auxiliary capacitance portion are
If both the values of S are the same as those in the conventional case, the value of the jump voltage ΔV generated in the pixel electrode potential when the gate pulse is turned off is also the same as in the conventional case, as shown in FIG. In this case, if the potential V LCCOM of the common electrode 24 is also the same as the potential V COM in the conventional case, almost the same optical characteristics as in the conventional case can be obtained and no problem occurs.

【0020】[0020]

【発明の効果】以上説明したように、この発明によれ
ば、薄膜トランジスタがオープン状態となった場合、そ
れに対応する液晶が駆動して遮光状態となるので、何ら
手を加えることなく、明点を明点に比べて視認されにく
い暗点に変えることができ、手間が全くかからず、コス
トの低減を図ることが可能となる。
As described above, according to the present invention, when a thin film transistor is in an open state, the liquid crystal corresponding thereto is driven to be in a light-shielding state, so that a bright point can be obtained without any modification. It is possible to change to a dark spot that is less visible than a bright spot, no labor is required, and cost can be reduced.

【図面の簡単な説明】[Brief description of drawings]

【図1】(A)はこの発明の一実施例を適用した表示パ
ネルの等価回路を示す図、(B)は薄膜トランジスタが
オープン状態となった場合の等価回路を示す図。
FIG. 1A is a diagram showing an equivalent circuit of a display panel to which an embodiment of the present invention is applied, and FIG. 1B is a diagram showing an equivalent circuit when a thin film transistor is in an open state.

【図2】従来の表示パネルの一部の平面図。FIG. 2 is a plan view of part of a conventional display panel.

【図3】図2のX−X線に沿う断面図。FIG. 3 is a sectional view taken along line XX of FIG.

【図4】この従来の表示パネルの等価回路を示す図。FIG. 4 is a diagram showing an equivalent circuit of this conventional display panel.

【図5】液晶に印加される電圧の波形などを示す図。FIG. 5 is a diagram showing a waveform of a voltage applied to liquid crystal.

【符号の説明】[Explanation of symbols]

5 走査ライン 6 信号ライン 7 薄膜トランジスタ(スイッチング素子) 8 画素電極 9 補助容量ライン 24 共通電極 31 画素容量部 32 補助容量部 33、34 寄生容量部 5 Scan Line 6 Signal Line 7 Thin Film Transistor (Switching Element) 8 Pixel Electrode 9 Auxiliary Capacitance Line 24 Common Electrode 31 Pixel Capacitance Section 32 Auxiliary Capacitance Section 33, 34 Parasitic Capacitance Section

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 スイッチング素子に接続され、画素デー
タに対応する容量を蓄積する容量素子を有する表示パネ
ルにおいて、 前記容量素子の前記スイッチング素子に接続されない側
の電極を、前記スイッチング素子がオープン状態のとき
に該スイッチング素子に対応する液晶を駆動して遮光状
態とする電源に接続したことを特徴とする表示パネル。
1. A display panel having a capacitive element connected to a switching element for accumulating a capacitance corresponding to pixel data, wherein an electrode of a side of the capacitive element that is not connected to the switching element is in an open state. A display panel, characterized in that it is connected to a power source that drives a liquid crystal corresponding to the switching element to provide a light shielding state.
【請求項2】 前記容量素子は画素容量部と補助容量部
とを備え、前記画素容量部の前記スイッチング素子に接
続されない側の電極を低電源に接続し、前記補助容量部
の前記スイッチング素子に接続されない側の電極を高電
源に接続したことを特徴とする請求項1記載の表示パネ
ル。
2. The capacitance element includes a pixel capacitance section and an auxiliary capacitance section, and an electrode of the pixel capacitance section that is not connected to the switching element is connected to a low power source to connect the switching element of the auxiliary capacitance section to the switching element. The display panel according to claim 1, wherein the electrode on the non-connected side is connected to a high power source.
【請求項3】 前記スイッチング素子がオープン状態の
ときに該スイッチング素子に対応する液晶に印加される
電圧は5〔V〕以上であることを特徴とする請求項1ま
たは2記載の表示パネル。
3. The display panel according to claim 1, wherein the voltage applied to the liquid crystal corresponding to the switching element is 5 [V] or more when the switching element is in the open state.
JP7709095A 1995-03-09 1995-03-09 Display panel Pending JPH08248389A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7709095A JPH08248389A (en) 1995-03-09 1995-03-09 Display panel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7709095A JPH08248389A (en) 1995-03-09 1995-03-09 Display panel

Publications (1)

Publication Number Publication Date
JPH08248389A true JPH08248389A (en) 1996-09-27

Family

ID=13624093

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7709095A Pending JPH08248389A (en) 1995-03-09 1995-03-09 Display panel

Country Status (1)

Country Link
JP (1) JPH08248389A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007029381A1 (en) * 2005-09-01 2007-03-15 Sharp Kabushiki Kaisha Display device, drive circuit, and drive method thereof
WO2011108437A1 (en) * 2010-03-01 2011-09-09 シャープ株式会社 Liquid crystal display device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007029381A1 (en) * 2005-09-01 2007-03-15 Sharp Kabushiki Kaisha Display device, drive circuit, and drive method thereof
JPWO2007029381A1 (en) * 2005-09-01 2009-03-12 シャープ株式会社 Display device, driving circuit and driving method thereof
JP4633121B2 (en) * 2005-09-01 2011-02-16 シャープ株式会社 Display device, driving circuit and driving method thereof
US8390552B2 (en) 2005-09-01 2013-03-05 Sharp Kabushiki Kaisha Display device, and circuit and method for driving the same
WO2011108437A1 (en) * 2010-03-01 2011-09-09 シャープ株式会社 Liquid crystal display device
JP5649235B2 (en) * 2010-03-01 2015-01-07 シャープ株式会社 Liquid crystal display

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