JP2000284721A - Light emitting display and driving method therefor - Google Patents
Light emitting display and driving method thereforInfo
- Publication number
- JP2000284721A JP2000284721A JP11094811A JP9481199A JP2000284721A JP 2000284721 A JP2000284721 A JP 2000284721A JP 11094811 A JP11094811 A JP 11094811A JP 9481199 A JP9481199 A JP 9481199A JP 2000284721 A JP2000284721 A JP 2000284721A
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- Japan
- Prior art keywords
- line
- scanning
- light emitting
- light
- drive
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 18
- 239000011159 matrix material Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000003071 parasitic effect Effects 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Control Of El Displays (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、有機ＥＬ素子等の
容量性発光素子を用いて画像表示を行う発光ディスプレ
イ及びその駆動方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting display for displaying an image using a capacitive light emitting device such as an organic EL device, and a driving method thereof.
【０００２】[0002]
【従来の技術】従来より有機ＥＬなどの発光素子を用い
たマトリクス表示ディスプレイが知られている。これは
複数の陽極線と複数の陰極線をマトリクス（格子）状に
配置し、このマトリクス状に配置した陽極線と陰極線の
各交点位置に発光素子を接続したものである。2. Description of the Related Art Conventionally, a matrix display using a light emitting element such as an organic EL has been known. In this method, a plurality of anode lines and a plurality of cathode lines are arranged in a matrix (lattice), and a light emitting element is connected to each intersection of the anode lines and the cathode lines arranged in the matrix.
【０００３】なお、各交点位置に接続される発光素子
は、図８にその等価回路を示すように、ダイオード特性
からなる発光エレメントＥと、これに並列接続された寄
生容量Ｃとで表すことができるものである。従って、発
光素子は電流が順方向から流れ込む場合のみ発光し、逆
方向から流れ込む場合は発光しない。As shown in an equivalent circuit of FIG. 8, a light emitting element connected at each intersection is represented by a light emitting element E having diode characteristics and a parasitic capacitance C connected in parallel to the light emitting element E. You can do it. Therefore, the light emitting element emits light only when the current flows in the forward direction, and does not emit light when the current flows in the reverse direction.
【０００４】図７に、従来の発光ディスプレイの駆動方
法を示す。同図の駆動方法は、単純マトリックス駆動方
式と呼ばれるもので、陽極線Ａ1〜Ａmと陰極線Ｂ1〜Ｂn
をマトリックス（格子）状に配置し、このマトリックス
状に配置した陽極線と陰極線の各交点位置に発光素子Ｅ
1,1〜Ｅm,nを接続し、この陽極線または陰極線のいずれ
か一方を一定の時間間隔で順次選択して走査するととも
に、この走査に同期して他方の線を駆動源たる電流源２
1〜２mでドライブしてやることにより、任意の交点位置
の発光素子を発光させるようにしたものである。FIG. 7 shows a driving method of a conventional light emitting display. The driving method shown in FIG. 1 is called a simple matrix driving method, in which anode lines A1 to Am and cathode lines B1 to Bn are used.
Are arranged in the form of a matrix (lattice), and the light emitting element E is provided at each intersection of the anode line and the cathode line arranged in the matrix.
1,1 to Em, n are connected, and either one of the anode line or the cathode line is sequentially selected and scanned at predetermined time intervals, and the other line is driven in synchronism with this scan by a current source 2 serving as a drive source.
By driving at a distance of 1 to 2 m, a light emitting element at an arbitrary intersection position emits light.
【０００５】前記駆動源によるドライブ方法には、陰極
線走査・陽極線ドライブ、陽極線走査・陰極線ドライブ
の２つの方法があるが、図７は、陰極線走査・陽極線ド
ライブの場合を示しており、陰極線Ｂ1〜Ｂnに陰極線走
査回路１を接続するとともに、陽極線Ａ1〜Ａmに電流源
２1〜２mからなる陽極線ドライブ回路２を接続したもの
である。また、１０は発光制御回路である。[0005] There are two driving methods using the driving source, namely, a cathode line scanning / anode line driving and an anode line scanning / a cathode line driving. FIG. 7 shows the case of the cathode line scanning / anode line driving. The cathode line scanning circuit 1 is connected to the cathode lines B1 to Bn, and the anode line drive circuit 2 including current sources 21 to 2m is connected to the anode lines A1 to Am. Reference numeral 10 denotes a light emission control circuit.
【０００６】陰極線走査回路１は、走査スイッチ３1〜
３nを一定時間間隔で順次アース端子側へ切り換えなが
ら走査していくことにより、陰極線Ｂ1〜Ｂn対してアー
ス電位（０Ｖ）を順次与えていく。また、陽極線ドライ
ブ回路２は、前記陰極線走査回路１のスイッチ走査に同
期してドライブスイッチ４1〜４mをオン・オフ制御する
ことにより陽極線Ａ1〜Ａmに定電流源２1〜２mを接続
し、所望の交点位置の発光素子に駆動電流を供給する。
発光制御回路１０は入力された発光データに応じて陰極
走査回路１と陽極ドライブ回路２の動作を制御するもの
である。The cathode line scanning circuit 1 includes scanning switches 31 to
3n is sequentially switched to the ground terminal side at regular time intervals while scanning, thereby sequentially applying the ground potential (0 V) to the cathode lines B1 to Bn. Further, the anode line drive circuit 2 connects the constant current sources 21 to 2m to the anode lines A1 to Am by controlling on / off of the drive switches 41 to 4m in synchronization with the switch scanning of the cathode line scanning circuit 1. A drive current is supplied to the light emitting element at the desired intersection position.
The light emission control circuit 10 controls the operations of the cathode scanning circuit 1 and the anode drive circuit 2 according to the input light emission data.
【０００７】例えば、発光素子Ｅ2,1とＥ3,1を発光させ
る場合を例に採ると、図示するように、陰極線走査回路
１の走査スイッチ３1がアース側に切り換えられ、第１
の陰極線Ｂ1にアース電位が与えられている時に、陽極
線ドライブ回路２のドライブスイッチ４2と４3を定電流
源側に切り換え、陽極線Ａ2とＡ3に定電流源２2と２3を
接続してやればよい。このような走査とドライブを高速
で繰り返すことにより、任意の位置の発光素子を発光さ
せるとともに、各発光素子があたかも同時に発光してい
るように制御するものである。For example, taking the case where the light emitting elements E2,1 and E3,1 emit light, as shown in the figure, the scanning switch 31 of the cathode ray scanning circuit 1 is switched to the ground side, and the first
When the ground potential is applied to the cathode line B1, the drive switches 42 and 43 of the anode line drive circuit 2 are switched to the constant current source side, and the constant current sources 22 and 23 are connected to the anode lines A2 and A3. By repeating such scanning and driving at a high speed, a light emitting element at an arbitrary position is caused to emit light, and control is performed so that each light emitting element emits light simultaneously.
【０００８】走査中の陰極線Ｂ1以外の他の陰極線Ｂ2〜
Ｂnには発光素子が発光する際に印可される順方向電圧
と同電位の逆バイアス電圧Ｖccを印加してやることによ
り、電流源から電流が流れ込まないようにして誤発光を
防止している。The other cathode lines B2 to B2 other than the scanning cathode line B1
By applying a reverse bias voltage Vcc having the same potential as a forward voltage applied when the light emitting element emits light to Bn, current is prevented from flowing from the current source to prevent erroneous light emission.
【０００９】このとき図７の状態において、各発光素子
の寄生容量の充電状態は次のようになる。発光させる発
光素子Ｅ2,1とＥ3,1には順方向に電圧が印加されること
により順方向の電荷が充電されている。発光素子Ｅ1,
1、Ｅ4,1〜Ｅm,1はその両端がアース電位に接続されて
いるため電荷は０である。発光素子Ｅ2,2〜Ｅ2,ｎ及び
Ｅ3,2〜Ｅ3,ｎは、陽極側が駆動源に接続されているが
陰極側が逆バイアス電圧Ｖccに接続されているため充電
される電荷は０である。また、発光素子Ｅ1,2〜Ｅ1,
ｎ、Ｅ4,2〜Ｅ4,n…Ｅm,1〜Ｅm,nは陽極側がアース電位
に接続され陰極側が逆バイアス電圧Ｖccに接続されるた
め、図示されるように逆方向の電荷が充電されている。
（なお図8において、順方向の電荷が充電され発光する
発光素子はダイオード記号で表し、発光しない発光素子
はコンデンサ記号で表している。また、逆方向の電荷が
充電される発光素子はハッチングされたコンデンサで表
している。）At this time, in the state of FIG. 7, the charged state of the parasitic capacitance of each light emitting element is as follows. A forward charge is applied to the light emitting elements E2,1 and E3,1 to emit light by applying a voltage in the forward direction. Light-emitting element E1,
1, E4,1 to Em, 1 have zero charge because both ends are connected to the ground potential. The light-emitting elements E2,2 to E2, n and E3,2 to E3, n have zero charge because the anode side is connected to the drive source but the cathode side is connected to the reverse bias voltage Vcc. Further, the light emitting elements E1,2 to E1,
n, E4,2 to E4, n... Em, 1 to Em, n are connected to the ground potential on the anode side and connected to the reverse bias voltage Vcc on the cathode side. I have.
(Note that in FIG. 8, light-emitting elements that emit light by being charged in the forward direction are represented by diode symbols, and light-emitting elements that do not emit light are represented by the capacitor symbol. Light-emitting elements that are charged by reverse charge are hatched. It is represented by a capacitor.)
【００１０】[0010]
【発明が解決しようとする課題】上述した従来の駆動法
によれば、走査を切換える度に発光素子に充放電を行う
必要があるため消費電力が増大するという問題がある。According to the above-mentioned conventional driving method, there is a problem that power consumption increases because it is necessary to charge and discharge the light emitting element every time scanning is switched.
【００１１】以下、図５、図６を基にして、従来の駆動
法における電力の消費量にいて説明する。図５、図６は
上述した従来の発光ディスプレイを４×４＝１６のマト
リクスで示したものであって他の構成は同一である。The power consumption in the conventional driving method will be described below with reference to FIGS. FIGS. 5 and 6 show the above-described conventional light emitting display in a 4 × 4 = 16 matrix, and other configurations are the same.
【００１２】なお、発光制御回路は図示省略されてい
る。図５は陰極線Ｂ1の走査時に発光素子Ｅ1,1、Ｅ2,1
を発光させる場合を示し、図６は陰極線Ｂ2の走査時に
発光素子Ｅ1,2、Ｅ3,2を発光させる場合を示している。
すなわち走査の切換えの前後において、陽極線Ａは
（１）ドライブ状態→ドライブ状態、（２）ドライブ状
態→非ドライブ状態、（３）非ドライブ状態→ドライブ
状態、（４）非ドライブ状態→非ドライブ状態、のいず
れかの状態となりえるため、（１）を陽極線Ａ1、
（２）を陽極線Ａ2、（３）を陽極線Ａ3、（４）を陽極
線Ａ4でそれぞれ表した。また、発光素子は電圧Ｖccが
印加されたとき電荷ｅが充電されるものとする。The light emission control circuit is not shown. FIG. 5 shows the light emitting elements E1,1 and E2,1 when scanning with the cathode ray B1.
FIG. 6 shows a case where the light emitting elements E1,2, E3,2 emit light during scanning of the cathode ray B2.
That is, before and after the scan switching, the anode line A is (1) drive state → drive state, (2) drive state → non-drive state, (3) non-drive state → drive state, (4) non-drive state → non-drive (1) is replaced with the anode wire A1,
(2) is represented by the anode wire A2, (3) by the anode wire A3, and (4) by the anode wire A4. The light emitting element is charged with the electric charge e when the voltage Vcc is applied.
【００１３】図５に示されるように、陰極線Ｂ1が走査
されているときの各発光素子の電荷の状態は次のとおり
である。発光する発光素子Ｅ1,1、Ｅ2,1は順方向の電荷
ｅが保持される。発光素子Ｅ3,1、Ｅ4,1は陽極側及び陰
極側ともにアース電位に接続されているため保持電荷は
０である。発光素子Ｅ1,2〜Ｅ1,4、Ｅ2,2〜Ｅ2,4は陽極
側が駆動源に接続され、陰極側が逆バイアス電圧Ｖccに
接続されているため保持電荷は０である。発光素子Ｅ3,
2〜Ｅ3,4、Ｅ4,2〜Ｅ4,4は陽極側がアース電位に接続さ
れ、陰極側が逆バイアス電圧Ｖccに接続されるため、逆
方向の電荷ｅが保持される。As shown in FIG. 5, the state of the charge of each light emitting element when the cathode ray B1 is scanned is as follows. The light emitting elements E1,1 and E2,1 that emit light retain the forward charge e. Since the light-emitting elements E3,1 and E4,1 are connected to the ground potential on both the anode side and the cathode side, the retained charges are zero. Since the light emitting elements E1,2 to E1,4 and E2,2 to E2,4 have the anode side connected to the driving source and the cathode side connected to the reverse bias voltage Vcc, the retained charge is zero. Light emitting element E3,
As for the electrodes 2 to E3,4 and E4,2 to E4,4, the anode side is connected to the ground potential and the cathode side is connected to the reverse bias voltage Vcc, so that the charges e in the reverse direction are held.
【００１４】また図６に示されるように、陰極線Ｂ2が
走査されているときの各発光素子の電荷の状態は次のと
おりである。発光する発光素子Ｅ1,2、Ｅ3,2は順方向の
電荷ｅが保持される。発光素子Ｅ2,2、Ｅ4,2は陽極側及
び陰極側ともにアース電位に接続されているため保持電
荷は０である。発光素子Ｅ1,1、Ｅ1,3、Ｅ1,4、Ｅ3,1、
Ｅ3,3、Ｅ3,4は陽極側が駆動源に接続され、陰極側が逆
バイアス電圧Ｖccに接続されているため保持電荷は０で
ある。発光素子Ｅ2,1、Ｅ2,3、Ｅ2,4、Ｅ4,1、Ｅ4,3、
Ｅ4,4は陽極側がアース電位に接続され、陰極側が逆バ
イアス電圧Ｖccに接続されるため、逆方向の電荷ｅが保
持される。As shown in FIG. 6, the state of the charge of each light emitting element when the cathode ray B2 is being scanned is as follows. The light emitting elements E1,2 and E3,2 that emit light retain the forward charge e. Since the light emitting elements E2,2 and E4,2 are connected to the ground potential on both the anode side and the cathode side, the retained charge is zero. Light emitting elements E1,1, E1,3, E1,4, E3,1,
E3,3 and E3,4 have zero charge because the anode side is connected to the drive source and the cathode side is connected to the reverse bias voltage Vcc. Light emitting elements E2,1, E2,3, E2,4, E4,1, E4,3,
In E4,4, the anode side is connected to the ground potential and the cathode side is connected to the reverse bias voltage Vcc, so that the charge e in the reverse direction is held.
【００１５】従って、陰極線Ｂ1から陰極線Ｂ2に走査を
切り換えたときの各発光素子の充放電量は次のようにな
る。なお、図６中には電荷の移動方向を矢印で示す。Accordingly, the charge / discharge amount of each light emitting element when scanning is switched from the cathode ray B1 to the cathode ray B2 is as follows. In FIG. 6, the direction in which the charges move is indicated by arrows.
【００１６】先ず、前回走査されていた陰極線Ｂ1上の
発光素子については、発光素子Ｅ1,1は逆方向から電荷
ｅが充電され、発光素子Ｅ2,1は逆方向から電荷２ｅを
充電され、発光素子Ｅ3,1は充放電がなく、発光素子Ｅ
4,1は逆方向から電荷ｅが充電される。First, with respect to the light emitting element on the cathode ray B1, which was scanned last time, the light emitting element E1,1 is charged with the electric charge e from the opposite direction, and the light emitting element E2,1 is charged with the electric charge 2e from the reverse direction, and the light is emitted. The element E3,1 has no charge / discharge and the light emitting element E
4, 1 is charged with electric charge e from the opposite direction.
【００１７】また、切り換え後に走査される陰極線Ｂ２
上の発光素子については、発光素子Ｅ1,2は順方向から
電荷ｅが充電され、発光素子Ｅ2,2は充放電がなく、発
光素子Ｅ3,2は順方向から電荷２ｅが充電され、発光素
子Ｅ4,2は電荷ｅが放電される。Further, a cathode ray B2 scanned after switching is performed.
As for the upper light emitting element, the light emitting element E1,2 is charged with the charge e from the forward direction, the light emitting element E2,2 is not charged and discharged, the light emitting element E3,2 is charged with the charge 2e from the forward direction, The electric charge e is discharged from E4,2.
【００１８】また，切り換えの前後において走査がなさ
れない発光素子については、発光素子Ｅ1,3、Ｅ1,4は充
放電がなく、発光素子Ｅ2,3、Ｅ2,4は逆方向から電荷ｅ
を充電され、発光素子Ｅ3,3、Ｅ3,4は順方向から電荷ｅ
が充電され、発光素子Ｅ4,3、Ｅ4,4は充放電がなされな
い。As for the light emitting elements which are not scanned before and after the switching, the light emitting elements E1, 3, E1, 4 have no charge / discharge, and the light emitting elements E2, 3, E2, 4 have the charge e from the opposite direction.
And the light emitting elements E3,3 and E3,4 are charged e from the forward direction.
Are charged, and the light emitting elements E4,3 and E4,4 are not charged or discharged.
【００１９】このようにして走査の切換えにともなう発
光素子の充放電はおこなわれるが、走査の切換えにとも
なう各陽極線毎の消費電力量（各陽極線に接続された発
光素子に対してなされる充電電荷量）は上記した〜
の場合毎に異なる。In this manner, the light emitting elements are charged and discharged in accordance with the switching of the scanning. However, the power consumption of each anode line in accordance with the switching of the scanning (for the light emitting elements connected to each anode line). The charge amount is as described above.
Is different for each case.
【００２０】（１）の場合（陰極線Ａ1）においては、
前回走査された発光素子E1,1に逆方向から電荷ｅが充電
され、今回走査される発光素子E1,2に順方向から電荷ｅ
が充電される。また、走査切換えの前後において走査対
象とならない発光素子Ｅ1,3、Ｅ1,4には充電はなされな
い。よっての場合の消費電荷が２ｅとなる。In the case (1) (cathode ray A1),
The light emitting element E1,1 scanned last time is charged with the electric charge e from the reverse direction, and the light emitting element E1,2 scanned this time is charged with the electric charge e from the forward direction.
Is charged. Further, the light emitting elements E1,3, E1,4 which are not to be scanned before and after the scan switching are not charged. Therefore, the consumed electric charge in this case is 2e.
【００２１】（２）の場合（陰極線Ａ2）においては、
前回走査された発光素子E2,1に逆方向から電荷２ｅが充
電され、今回走査される発光素子E2,2は充電がなされな
い。また、走査切換えの前後において走査対象とならな
い発光素子Ｅ2,3、Ｅ2,4には逆方向から電荷ｅが充電さ
れる。よっての場合の消費電荷が４ｅとなる。In the case (2) (cathode ray A2),
The light emitting element E2,1 scanned last time is charged with the electric charge 2e from the opposite direction, and the light emitting element E2,2 scanned this time is not charged. The light emitting elements E2,3, E2,4 which are not to be scanned before and after the scan switching are charged with electric charge e from the opposite direction. Therefore, the consumed electric charge in this case is 4e.
【００２２】（３）の場合（陰極線Ａ3）においては、
前回走査された発光素子E3,1は充電がなされず、今回走
査される発光素子E3,2に順方向から電荷２ｅが充電され
る。また、走査切換えの前後において走査対象とならな
い発光素子Ｅ3,3、Ｅ3,4には逆方向から電荷ｅが充電さ
れる。よっての場合の消費電荷が４ｅとなる。In the case (3) (cathode ray A3),
The light emitting element E3,1 scanned last time is not charged, and the light emitting element E3,2 scanned this time is charged with the electric charge 2e from the forward direction. In addition, before and after the scan switching, the light emitting elements E3,3, E3,4 that are not to be scanned are charged with electric charge e from the opposite direction. Therefore, the consumed electric charge in this case is 4e.
【００２３】（４）の場合（陰極線Ａ4）においては、
前回走査された発光素子E4,1に逆方向から電荷ｅが充電
され、今回走査される発光素子E4,2は充電がなされな
い。（電荷ｅが放電される。）また、走査切換えの前後
において走査対象とならない発光素子Ｅ4,3、Ｅ4,4は充
電はなされない。よっての場合の消費電荷がｅとな
る。In case (4) (cathode ray A4),
The light emitting element E4,1 scanned last time is charged with the electric charge e from the opposite direction, and the light emitting element E4,2 scanned this time is not charged. (Electric charges e are discharged.) Further, before and after the scan switching, the light emitting elements E4,3, E4,4 which are not to be scanned are not charged. Therefore, the electric charge consumed in this case is e.
【００２４】以上の説明からわかるように、走査の切換
えの度に電力が消費されるが、特に、の場合は、走
査の切換えの前後において走査対象ならない発光素子に
充電がなされるため、その消費電力は多くなる。(仮に
走査線が６４本だとすると６３個の素子に対して充電が
必要となる) しかも、、の場合は走査線の数が多くなっても消費
電力は変わらないが、、の場合は走査線の数が多い
ほど消費電力はより多くなるため、ディスプレイの大型
化の妨げとなっている。As can be seen from the above description, power is consumed every time the scanning is switched. In particular, in the case of (1), the light emitting elements which are not to be scanned are charged before and after the switching of the scanning. Electric power increases. (If the number of scanning lines is 64, charging of 63 elements is necessary.) In addition, in the case of (1), power consumption does not change even if the number of scanning lines increases, but in the case of (2), As the number increases, the power consumption increases, which hinders an increase in the size of the display.
【００２５】本発明は以上の問題を解決するものであ
り、従来に比べて消費電力の少ない発光ディスプレイを
提供することを目的とする。An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a light-emitting display which consumes less power than conventional ones.
【００２６】[0026]
【課題を解決するための手段】請求項１に記載の発明
は、マトリクス状に配置した陽極線と陰極線に対してそ
の各交点位置において発光素子を接続し、前記陽極線及
び陰極線のいずれか一方を走査線とするとともに他方を
ドライブ線とし、走査線を走査しながら、該走査に応じ
て所望のドライブ線に駆動源を接続することにより走査
線とドライブ線の交点位置に接続された発光素子を発光
させるようにした発光ディスプレイであって、前記ドラ
イブ線と他の前記ドライブ線を接続可能とする接続手段
を設けたことを特徴としている。According to a first aspect of the present invention, a light emitting element is connected to an anode line and a cathode line arranged in a matrix at each intersection point thereof, and one of the anode line and the cathode line is connected. A light emitting element connected to the intersection of the scan line and the drive line by connecting a drive source to a desired drive line in accordance with the scan while scanning the scan line while using the other as a drive line The light emitting display is characterized in that a connection means for connecting the drive line to another drive line is provided.
【００２７】また、請求項２に記載の発明は、マトリク
ス状に配置した陽極線と陰極線に対してその各交点位置
において発光素子を接続し、前記陽極線及び陰極線のい
ずれか一方を走査線とするとともに他方をドライブ線と
し、走査線を走査しながら、該走査に応じて所望のドラ
イブ線に駆動源を接続することにより走査線とドライブ
線の交点位置に接続された発光素子を発光させるように
した発光ディスプレイであって、前記走査線は走査され
るときはアース手段に接続され走査されないときは定電
圧源に接続され、前記ドライブ線は前記発光素子を発光
させるときは前記駆動源に接続され前記発光素子を発光
させないときはアース手段に接続され、前記ドライブ線
と他の前記ドライブ線を接続可能とする接続手段を設け
たことを特徴としている。According to a second aspect of the present invention, a light emitting element is connected to an anode line and a cathode line arranged in a matrix at respective intersections thereof, and one of the anode line and the cathode line is connected to a scanning line. While the other is a drive line, while scanning the scan line, a drive source is connected to a desired drive line in accordance with the scan, so that the light emitting element connected at the intersection of the scan line and the drive line emits light. The scanning line is connected to a grounding means when scanning, is connected to a constant voltage source when scanning is not performed, and the drive line is connected to the driving source when the light emitting element emits light. When the light-emitting element is not caused to emit light, a connection means is provided which is connected to a grounding means so as to connect the drive line to another drive line. There.
【００２８】また、請求項３に記載の発明は、請求項１
または請求項２に記載の発明において、前記接続手段は
前記ドライブ線のすべてが接続可能とされる接続ライン
を含んでなることを特徴としている。Further, the invention described in claim 3 is the first invention.
Alternatively, in the invention according to claim 2, the connection means includes a connection line to which all of the drive lines can be connected.
【００２９】また、請求項４に記載の発明は、請求項1
ないしは３のいずれかに記載の発明において、前記接続
手段は、任意の走査線の走査が行われる前走査期間が終
了し次の走査線の走査が行われる次走査期間に切り換わ
るまでのリセット期間において、接続される発光素子の
うち前記走査期間の走査対象となる発光素子及び次走査
期間の走査対象となる発光素子のいずれか一方が発光す
るドライブ線を互いに接続するようにしたことを特徴と
している。[0029] The invention described in claim 4 is the same as the claim 1.
In the invention described in any one of the first to third aspects, the connection unit may be configured to perform a reset period until a pre-scanning period in which scanning of an arbitrary scanning line is performed ends and a switch to a next scanning period in which scanning of a next scanning line is performed. Wherein, among the connected light-emitting elements, one of the light-emitting element to be scanned in the scanning period and the light-emitting element to be scanned in the next scanning period are connected to each other by drive lines that emit light. I have.
【００３０】また、請求項５に記載の発明は、請求項４
に記載の発明において、前記走査期間において走査され
る走査線に接続された発光素子が発光状態かまたは非発
光状態のいずれであるかを記憶する第1の記憶手段と、
前記次走査期間において走査される走査線に接続された
発光素子が発光状態かまたは非発光状態のいずれである
かを記憶する第２の記憶手段と、前記第1の記憶手段及
び第２の記憶手段の記憶内容に基づいて、前記リセット
期間における接続手段の動作を制御する制御手段とを備
えたことを特徴としている。The invention described in claim 5 is the same as the invention described in claim 4.
In the invention described in 1, the first storage means for storing whether the light emitting element connected to the scanning line scanned in the scanning period is in a light emitting state or a non-light emitting state,
Second storage means for storing whether a light emitting element connected to a scanning line scanned in the next scanning period is in a light emitting state or a non-light emitting state; and the first storage means and the second storage means Control means for controlling the operation of the connection means during the reset period based on the storage contents of the means.
【００３１】また、請求項６に記載の発明は、請求項１
ないしは５のいずれかに記載の発明において、前記前記
発光素子は有機ＥＬ材料を含んでなることを特徴として
いる。The invention described in claim 6 is the first invention.
6. The light-emitting device according to any one of Items 1 to 5, wherein the light-emitting element includes an organic EL material.
【００３２】また、請求項７に記載の発明は、マトリク
ス状に配置した陽極線と陰極線に対してその各交点位置
において発光素子を接続し、前記陽極線及び陰極線のい
ずれか一方を走査線とするとともに他方をドライブ線と
し、走査線を走査しながら、該走査に応じて所望のドラ
イブ線に駆動源を接続することにより走査線とドライブ
線の交点位置に接続された発光素子を発光させるように
した発光ディスプレイの駆動方法であって、任意の走査
線の走査が行われる前走査期間が終了し次の走査線の走
査が行われる次走査期間に切り換わるまでのリセット期
間において、接続される発光素子のうち前記走査期間の
走査対象となる発光素子及び次走査期間の走査対象とな
る発光素子のいずれか一方が発光するドライブ線を互い
に接続するようにしたことを特徴としている。Further, according to a seventh aspect of the present invention, a light emitting element is connected to each of the anode lines and the cathode lines arranged in a matrix at intersections thereof, and one of the anode lines and the cathode lines is connected to a scanning line. While the other is a drive line, while scanning the scan line, a drive source is connected to a desired drive line in accordance with the scan, so that the light emitting element connected at the intersection of the scan line and the drive line emits light. The method for driving a light emitting display according to any one of claims 1 to 3, wherein the connection is performed in a reset period from the end of a pre-scanning period in which scanning of an arbitrary scanning line is performed to a transition to a next scanning period in which scanning of a next scanning line is performed. Drive lines for emitting one of the light emitting elements to be scanned in the scanning period and the light emitting elements to be scanned in the next scanning period among the light emitting elements are connected to each other. It is characterized in that was.
【００３３】また、請求項８に記載の発明は、請求項７
に記載の発明において、任意の走査線の走査が行われる
走査期間においては、走査がなされている走査線はアー
ス手段に接続されるとともに走査がなされない走査線は
定電圧源に接続され、発光される発光素子が接続される
ドライブ線は前記駆動源に接続されるとともに発光がな
されない発光素子が接続されるドライブ線はアース手段
に接続されることを特徴としている。The invention described in claim 8 is the same as the invention described in claim 7.
In the invention described in the above, in a scanning period in which scanning of an arbitrary scanning line is performed, a scanning line being scanned is connected to ground means, and a scanning line not being scanned is connected to a constant voltage source, and light emission is performed. The drive line to which the light emitting element to be connected is connected to the drive source, and the drive line to which the light emitting element which does not emit light is connected is connected to ground means.
【００３４】また、請求項９に記載の発明は、請求項７
または８に記載の発明において、前記前記発光素子は有
機ＥＬ材料を含んでなることを特徴としている。Further, the invention according to claim 9 is the same as the invention according to claim 7.
In the invention described in Item 8, the light-emitting element includes an organic EL material.
【００３５】[0035]
【作用】以上のように本発明の発光ディスプレイ及びそ
の駆動方法によれば、従来の発光ディスプレイに比べ
て、走査の切換えに伴って発生する消費電力を低減させ
ることができる。As described above, according to the light emitting display of the present invention and the method of driving the same, it is possible to reduce power consumption caused by switching of scanning as compared with the conventional light emitting display.
【００３６】[0036]
【発明の実施の形態】以下、図面を基にして本発明の実
施の形態について説明する。図１〜図４は本発明の実施
形態である発光ディスプレイを４×４＝１６のマトリク
スで示したものである。なお、本実施形態と従来技術と
の構成上の違いは、任意の陽極線とそれ以外の他の陽極
線とを接続可能とする陽極線接続ラインを設けたことで
あり、他の構成はすべて同一である。Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a light emitting display according to an embodiment of the present invention in a 4 × 4 = 16 matrix. The configuration difference between the present embodiment and the conventional technology is that an anode line connection line that enables connection between an arbitrary anode line and other anode lines is provided, and all other configurations are provided. Are identical.
【００３７】図示されるように、陽極線Ａ１〜Ａ４と陰
極線Ｂ１〜Ｂ４はマトリクス（格子）状に配置され、こ
のマトリクス状に配置した陽極線と陰極線の各交点位置
に発光素子Ｅ1,1〜Ｅ4,4が接続される。陰極線Ｂ１〜Ｂ
４は陰極線走査回路１に接続され、陽極線Ａ１〜Ａ４は
電流源２1〜２4等からなる陽極線ドライブ回路２に接続
される。As shown in the figure, the anode lines A1 to A4 and the cathode lines B1 to B4 are arranged in a matrix (lattice), and the light emitting elements E1,1 to E1 are arranged at the intersections of the anode and cathode lines arranged in the matrix. E4,4 are connected. Cathode rays B1 to B
4 is connected to the cathode line scanning circuit 1, and the anode lines A1 to A4 are connected to the anode line drive circuit 2 including current sources 21 to 24 and the like.
【００３８】陰極線走査回路１は、各陰極線Ｂ１〜Ｂ４
を順次走査するための走査スイッチ３1〜３4を備えてい
る。各走査スイッチ３1〜３4は２個の接続端子を有して
おり、第1の端子は電源電圧からなる逆バイアス電圧Ｖc
cに接続され、第2の端子はアース電位に接続されてい
る。これにより各陰極線Ｂ１〜Ｂ４は、逆バイアス電圧
Ｖccとアース電位のいずれかに接続可能とされている。
なお、逆バイアス電圧Ｖccは、従来技術においても説明
したとおり、走査されていない陰極線に対して発光素子
の発光時間の両端電圧と同電位の電圧を印加するもので
あり、走査されていない陰極線上の発光素子の誤発光を
防止するものである。The cathode line scanning circuit 1 includes the cathode lines B1 to B4
Are provided with scanning switches 31 to 34 for sequentially scanning. Each of the scanning switches 31 to 34 has two connection terminals, and the first terminal has a reverse bias voltage Vc composed of a power supply voltage.
c, and the second terminal is connected to the ground potential. Thus, each of the cathode lines B1 to B4 can be connected to either the reverse bias voltage Vcc or the ground potential.
As described in the related art, the reverse bias voltage Vcc applies a voltage of the same potential as the voltage at both ends of the light emitting element to the non-scanned cathode line, and applies the voltage on the non-scanned cathode line. Erroneous light emission of the light emitting element is prevented.
【００３９】陽極ドライブ回路２は駆動源である電流源
２1〜２4と、各陽極線Ａ1〜Ａ4をドライブするためのド
ライブスイッチ４1〜４4とを備えており、各ドライブス
イッチ４1〜４4は３個の接続端子を有している。第1の
端子は電流源２1〜２4に接続され、第２の端子はアース
電位に接続され、第３の端子は陽極線接続ライン５に接
続されている。これにより、各陽極線Ａ1〜Ａ4は電流源
２1〜２4、アース電位もしくは陽極線接続ライン５のい
ずれかに接続可能とされている。このドライブスイッチ
が操作されることによって、ドライブされる陽極線は電
流源に接続され、ドライブされない陽極線はアース電位
に接続される。なお、図示されていないが、従来技術と
同様に、入力された発光データに応じて陰極線走査回路
１と陽極線ドライブ回路２の動作制御を行う発光制御回
路が設けられている。The anode drive circuit 2 includes current sources 21 to 24 as drive sources and drive switches 41 to 44 for driving the anode lines A1 to A4. Each of the drive switches 41 to 44 includes three drive switches. Connection terminals. The first terminal is connected to the current sources 21 to 24, the second terminal is connected to the ground potential, and the third terminal is connected to the anode line connection line 5. Thus, each of the anode lines A1 to A4 can be connected to one of the current sources 21 to 24, the ground potential, or the anode line connection line 5. By operating the drive switch, the driven anode wire is connected to the current source, and the undriven anode wire is connected to the ground potential. Although not shown, a light emission control circuit for controlling the operation of the cathode line scanning circuit 1 and the anode line drive circuit 2 according to the input light emission data is provided as in the conventional technology.
【００４０】次に図１〜図４に基づき本発明の実施形態
の動作について説明する。図１は陰極線Ｂ1の走査時に
おいて発光素子Ｅ1,1、Ｅ2,1が発光する状態を示し、図
２は本発明の特徴であるリセット動作を示し、図３は走
査が陰極線Ｂ2に切り換わり陽極線Ａ2、Ａ4をドライブ
する瞬間の状態を示し、図４は陰極線Ｂ2の走査時に陽
極線Ａ2、Ａ4をドライブし、発光素子Ｅ1,2、Ｅ3,2が定
常状態で発光する状態を示している。すなわち各各陽極
線Ａ1〜Ａ4は、それぞれ上述した（１）〜（４）の場合
に該当しており、（１）の場合は陽極線Ａ1、（２）の
場合は陽極線Ａ2、（３）の場合は陽極線Ａ3、（４）の
場合は陽極線Ａ4でそれぞれ表した。また、発光素子の
寄生容量には電圧Ｖccが印加されたとき電荷ｅが充電さ
れるものとする。Next, the operation of the embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a state in which the light emitting elements E1,1, E2,1 emit light during scanning of the cathode line B1, FIG. 2 shows a reset operation which is a feature of the present invention, and FIG. FIG. 4 shows the state at the moment when the lines A2 and A4 are driven, and FIG. 4 shows the state where the anode lines A2 and A4 are driven during scanning of the cathode line B2 and the light emitting elements E1, 2, E3 and 2 emit light in a steady state. . That is, the respective anode lines A1 to A4 correspond to the above-described cases (1) to (4), respectively. In the case of (1), the anode lines A1, in the case of (2), the anode lines A2, (3). ) Is indicated by the anode line A3, and (4) is indicated by the anode line A4. It is assumed that the charge e is charged to the parasitic capacitance of the light emitting element when the voltage Vcc is applied.
【００４１】図１において、陰極線Ｂ1はアース電位に
接続され、陰極線Ｂ2〜Ｂ4は逆バイアス電圧Ｖccに接続
され、陽極線Ａ1、Ａ2は電流源２1、２2に接続され、陽
極線Ａ3、Ａ4はアース電位に接続される。In FIG. 1, the cathode line B1 is connected to the ground potential, the cathode lines B2 to B4 are connected to the reverse bias voltage Vcc, the anode lines A1 and A2 are connected to the current sources 21 and 22, and the anode lines A3 and A4 are connected. Connected to earth potential.
【００４２】このときの各発光素子の電荷の充電状態は
次のとおりである。発光する発光素子Ｅ1,1、Ｅ2,1は順
方向の電荷ｅが保持された状態で駆動源２1、２2から供
給される電流により発光している。発光素子Ｅ3,1、Ｅ
4,1は陽極側及び陰極側ともにアース電位に接続されて
いるため保持電荷は０である。発光素子Ｅ1,2〜Ｅ1,4、
Ｅ2,2〜Ｅ2,4は陽極側が駆動源に接続され、陰極側が逆
バイアス電圧Ｖccに接続されているため保持電荷は０で
ある。発光素子Ｅ3,2〜Ｅ3,4、Ｅ4,2〜Ｅ4,4は陽極側が
アース電位に接続され陰極側が逆バイアス電圧Ｖccに接
続されるため、逆方向の電荷ｅが保持される。The state of charge of each light emitting element at this time is as follows. The light emitting elements E1,1 and E2,1 that emit light emit light by the current supplied from the drive sources 21 and 22 in a state where the forward charge e is held. Light-emitting elements E3,1, E
Nos. 4 and 1 have zero charge because both the anode side and the cathode side are connected to the ground potential. Light emitting elements E1,2 to E1,4,
In E2,2 to E2,4, the anode is connected to the driving source and the cathode is connected to the reverse bias voltage Vcc. The light emitting elements E3,2 to E3,4 and E4,2 to E4,4 have the anode side connected to the ground potential and the cathode side connected to the reverse bias voltage Vcc, so that the charges e in the opposite direction are held.
【００４３】陰極線Ｂ1の走査が終了すると、陰極線Ｂ2
の走査に移行する前に、陽極線Ａ2と陽極線Ａ3を接続す
るリセット動作を行う。すなわち図２に示すように、ド
ライブスイッチ４2、４3を接続ライン５側に切り換える
ことにより陽極線Ａ2と陽極線Ａ3を接続する。このと
き、他のドライブスイッチ４1、４4及びすべての走査ス
イッチ３1〜３4の切換動作は行わない。When scanning of the cathode ray B1 is completed, the cathode ray B2
Before the scanning is performed, a reset operation for connecting the anode lines A2 and A3 is performed. That is, as shown in FIG. 2, the anode lines A2 and A3 are connected by switching the drive switches 42 and 43 to the connection line 5 side. At this time, the switching operations of the other drive switches 41 and 44 and all the scanning switches 31 to 34 are not performed.
【００４４】これにより、陽極線Ａ2と陽極線Ａ3は同一
電位となり、互いに接続される陽極線Ａ2上の発光素子
と陽極線Ａ3上の発光素子との間で、図２中矢印で示さ
れるように電荷の移動がなされ、これらの発光素子が保
持する電荷量はそれぞれ等しくなる。As a result, the anode line A2 and the anode line A3 have the same potential, and the light emitting element on the anode line A2 and the light emitting element on the anode line A3, which are connected to each other, as shown by arrows in FIG. Then, the charges are moved, and the amounts of charges held by these light emitting elements become equal.
【００４５】すなわち、図１の状態において発光素子Ｅ
2,1に保持されていた順方向の電荷ｅと発光素子Ｅ3,2、
Ｅ3,3、Ｅ3,4に各々保持されていた逆方向の電荷ｅ（合
計すると逆方向の電荷は３ｅ）が相殺され、合計で２ｅ
の逆方向の電荷が、陽極線Ａ2上の発光素子Ｅ2,1〜Ｅ2,
4と陽極線Ａ3上の発光素子Ｅ3,1〜Ｅ3,4の各々に均等に
分散されて保持されることとなる。つまり図２に示すよ
うに、陽極線Ａ2上の発光素子Ｅ2,1〜Ｅ2,4と陽極線Ａ3
上の発光素子Ｅ3,1〜Ｅ3,4は各々が逆方向の電荷１／４
ｅを保持する状態となる。なおこのとき、発光素子Ｅ2,
1〜Ｅ2,4、Ｅ3,1〜Ｅ3,4には駆動源もしくは電源電圧か
ら電流が流れ込むことはないので、電力の消費はない。
また、陽極線Ａ1及びＡ4は図１の状態を維持したままで
あるため、発光素子Ｅ1,1はリセット動作中においても
発光を持続することになるが、リセット動作に要する期
間は走査期間に比べて短いため、リセット動作中の発光
が画像の形成上及ぼす悪影響は殆どない。That is, in the state shown in FIG.
The forward charge e held at 2,1 and the light emitting element E3,2,
The electric charges e in the opposite direction held in E3,3 and E3,4 respectively (total electric charges in the opposite direction are 3e) are offset, and a total of 2e
Of the light-emitting elements E2,1 to E2, on the anode line A2.
4 and the light emitting elements E3,1 to E3,4 on the anode line A3 are equally distributed and held. That is, as shown in FIG. 2, the light emitting elements E2,1 to E2,4 on the anode line A2 and the anode line A3
The upper light emitting elements E3,1 to E3,4 each have a charge of 1/4 in the opposite direction.
e is held. At this time, the light emitting element E2,
Since no current flows from 1 to E2,4 and E3,1 to E3,4 from the drive source or the power supply voltage, no power is consumed.
Further, since the anode lines A1 and A4 maintain the state shown in FIG. 1, the light emitting element E1,1 continues to emit light even during the reset operation. However, the period required for the reset operation is shorter than the scanning period. Therefore, light emission during the reset operation has almost no adverse effect on image formation.
【００４６】このリセット動作が終了すると、図３、図
４に示すように陰極線Ｂ2の走査に移行し、発光素子Ｅ
1,2とＥ3,2の発光を行う。すなわち、陰極線Ｂ2はアー
ス電位に接続され、陰極線Ｂ1、Ｂ3、Ｂ4は逆バイアス
電圧Ｖccに接続され、陽極線Ａ1、Ａ3は電流源２1、２3
に接続され、陽極線Ａ2、Ａ4はアース電位に接続され
る。When the reset operation is completed, the operation shifts to the scanning of the cathode ray B2 as shown in FIGS.
Light emission of 1,2 and E3,2 is performed. That is, the cathode line B2 is connected to the ground potential, the cathode lines B1, B3, B4 are connected to the reverse bias voltage Vcc, and the anode lines A1, A3 are connected to the current sources 21, 23.
And the anode lines A2 and A4 are connected to the ground potential.
【００４７】このときの各発光素子の電荷の状態は図４
に示される。すなわち、発光素子Ｅ1,2、Ｅ3,2は順方向
の電荷ｅが保持される。発光素子Ｅ2,2、Ｅ4,2は陽極側
及び陰極側ともにアース電位に接続されているため保持
される電荷は０である。発光素子Ｅ1,1、Ｅ1,3、Ｅ1,
4、Ｅ3,1、Ｅ3,3、Ｅ3,4は陽極側が駆動源に接続され、
陰極側が逆バイアス電圧Ｖccに接続されているため保持
される電荷は０である。発光素子Ｅ2,1、Ｅ2,3、Ｅ2,
4、Ｅ4,1、Ｅ4,3、Ｅ4,4は陽極側がアース電位に接続さ
れ、陰極側が逆バイアス電圧Ｖccに接続されるため逆方
向の電荷ｅが充電される。The state of the charge of each light emitting element at this time is shown in FIG.
Is shown in That is, the light-emitting elements E1,2 and E3,2 hold the forward charge e. Since the light emitting elements E2,2 and E4,2 are connected to the ground potential on both the anode side and the cathode side, the electric charge held is zero. Light-emitting elements E1,1, E1,3, E1,
4, E3,1, E3,3, E3,4, the anode side is connected to the drive source,
Since the cathode side is connected to the reverse bias voltage Vcc, the charge held is zero. Light-emitting elements E2,1, E2,3, E2,
4, E4,1, E4,3 and E4,4 are connected to the ground potential on the anode side and connected to the reverse bias voltage Vcc on the cathode side, so that the charges e in the reverse direction are charged.
【００４８】以上の状態に移行する際の電荷の移動は、
図２に示すリセット動作中の状態から図３に示す陰極線
Ｂ2を走査する状態に切り換わった瞬間に行われる。図
３に充放電による電荷の流れを矢印で示す。The movement of the electric charge when shifting to the above state is as follows.
This is performed at the moment when the state during the reset operation shown in FIG. 2 is switched to the state for scanning the cathode ray B2 shown in FIG. FIG. 3 shows the flow of charge due to charging and discharging by arrows.
【００４９】まず、陽極線Ａ1上の発光素子において
は、素子Ｅ1,1に逆方向から電荷ｅが充電され、素子Ｅ
1,2は順方向の電荷ｅが充電されたところで所望の瞬時
輝度で発光する定常発光状態となる。また素子Ｅ1,3、
Ｅ1,4は充放電はなされない。First, in the light emitting element on the anode line A1, the element E1,1 is charged with a charge e from the opposite direction, and the element E1,
1 and 2 are in a steady light emission state in which light is emitted at a desired instantaneous luminance when the forward charge e is charged. Elements E1,3,
E1,4 are not charged / discharged.
【００５０】また、陽極線Ａ2上の発光素子において
は、Ｅ2,1は逆方向から電荷３／４ｅが充電され、Ｅ2,2
は逆方向の電荷１／4ｅが放電され、Ｅ2,3は逆方向から
電荷３／４ｅが充電され、Ｅ2,4も逆方向から電荷３／
４ｅが充電される。In the light emitting element on the anode line A2, E2,1 is charged with a charge 3 / 4e from the opposite direction, and E2,2 is charged.
Is charged with 1 / 4e in the opposite direction, E2,3 is charged with 3 / 4e in the opposite direction, and E2,4 is also charged with 3 / 3e in the opposite direction.
4e is charged.
【００５１】また、陽極線Ａ3上の発光素子において
は、陰極線Ｂ2の走査に切り換わった瞬間に陽極線Ａ3に
電流源２3が接続され、電流源２3は素子Ｅ3,2を定常発
光させるべく、その充電電荷が順方向の電荷ｅとなるよ
うに陽極線Ａ3に電流を供給することから、Ｅ3,1は順方
向から電荷1／４ｅが充電され、Ｅ3,2は順方向の電荷５
／4ｅが充電されたところで定常発光状態となり、Ｅ3,3
は順方向から電荷１／４ｅが充電され、Ｅ3,4も順方向
から電荷1／４ｅが充電される。In the light emitting element on the anode line A3, the current source 23 is connected to the anode line A3 at the moment when the scanning is switched to the scanning of the cathode line B2. A current is supplied to the anode line A3 so that the charged electric charge becomes the electric charge e in the forward direction. Thus, E3,1 is charged with a charge 1 / 4e from the forward direction, and E3,2 is charged with the electric charge 5 in the forward direction.
When / 4e is charged, a steady light emission state occurs, and E3,3
Is charged with a charge 1 / 4e from the forward direction, and E3,4 is also charged with a charge 1 / 4e from the forward direction.
【００５２】また、陽極線Ａ4上の発光素子において
は、Ｅ4,1は逆方向から電荷ｅが充電され、Ｅ4,2は逆方
向に電荷ｅを放電し、Ｅ4,3及びＥ4,4電荷の充放電はな
されない。In the light emitting element on the anode line A4, E4,1 is charged with the electric charge e in the reverse direction, E4,2 discharges the electric charge e in the reverse direction, and E4,3 and E4,4 are charged. No charge / discharge is performed.
【００５３】その後は、図４に示すように、発光素子Ｅ
1,2とＥ3,2が定常発光する状態となる。陰極線Ｂ2の走
査の期間中は、電流源２1から陽極線Ａ1に供給される駆
動電流はＥ1,2の発光にのみ費やされ、同様に電流源２3
から陽極線Ａ3に供給される駆動電流はＥ3,2の発光にの
み費やされる。Thereafter, as shown in FIG.
1,2 and E3,2 emit a steady light. During the scanning of the cathode line B2, the drive current supplied from the current source 21 to the anode line A1 is consumed only for the emission of E1,2.
The driving current supplied to the anode line A3 from is consumed only for the emission of E3,2.
【００５４】このように本発明の駆動方法によれば、陰
極線Ｂ1の走査が終了してから陰極線Ｂ2に走査が切り換
わるまでの間において、（１）の場合の消費電荷は２ｅ
であり、（２）の場合の消費電荷は２ｅであり、（３）
の場合の消費電荷は9／４ｅであり（４）の場合の消費
電荷はｅとなる。すなわち、従来に比べて、（１）及び
（４）の場合の消費電荷は同じであるが（２）の場合の
消費電荷は２ｅ減少し、（３）の場合の消費電荷は７／
４ｅ減少する。As described above, according to the driving method of the present invention, in the case of (1), the consumed electric charge in the case of (1) is 2e between the time when the scanning of the cathode line B1 is completed and the time when the scanning is switched to the cathode line B2.
In the case of (2), the consumed electric charge is 2e, and (3)
In the case of (4), the consumed charge is 9 / 4e, and in the case of (4), the consumed charge is e. That is, compared to the conventional case, the charge consumption in the cases (1) and (4) is the same, but the charge consumption in the case (2) is reduced by 2e and the charge consumption in the case (3) is 7 /
4e decrease.
【００５５】以上説明したように、本実施形態によれ
ば、前走査期間（陰極線Ｂ1の走査）から次走査期間
（陰極線Ｂ2の走査）の間にリセット期間を設け、この
リセット期間においては、走査の切り換えに伴う消費電
力が多いドライブ線、すなわち、接続される発光素子が
前走査期間と次走査期間のいずれか一方で発光するドラ
イブ線（陽極線Ａ2、陽極線Ａ3）を、陽極線接続ライン
５に接続することで互いに接続するようにしている。As described above, according to the present embodiment, the reset period is provided between the previous scanning period (scanning of the cathode line B1) and the next scanning period (scanning of the cathode line B2). A drive line (anode line A2, anode line A3) in which the connected light emitting element emits light in one of the pre-scanning period and the next scanning period is connected to an anode line connection line. 5 are connected to each other.
【００５６】その結果、前走査期間のみ発光するドライ
ブ線上の発光素子と次走査期間のみ発光するドライブ線
上の発光素子が保持する電荷量を平均化し、走査が切り
換わった際にこれらの発光素子に充電される電荷量を従
来よりも減少させている。従って、本実施形態は、ディ
スプレイの駆動電力を従来に比べて低減させることがで
き、駆動電力コストの低い発光ディスプレイを実現して
いる。As a result, the amounts of charges held by the light emitting elements on the drive line that emits light only during the previous scanning period and the light emitting elements on the drive line that emit light only during the next scanning period are averaged, and these light emitting elements are switched when scanning is switched. The amount of charge to be charged is reduced as compared with the conventional case. Therefore, in the present embodiment, the driving power of the display can be reduced as compared with the related art, and a light emitting display with low driving power cost is realized.
【００５７】[0057]
【発明の効果】以上のように本発明の発光ディスプレイ
及びその駆動方法によれば、従来の発光ディスプレイに
比べて走査の切換えに伴って発生する消費電力を低減さ
せることができ、電力コストが低減させたパネルの大型
化に好適な発光ディスプレイ及びその駆動方法を提供す
ることができる。As described above, according to the light emitting display and the method of driving the same according to the present invention, power consumption caused by switching of scanning can be reduced as compared with the conventional light emitting display, and the power cost is reduced. It is possible to provide a light emitting display suitable for increasing the size of the panel and a driving method thereof.
【図１】 本発明の実施形態の説明図FIG. 1 is an explanatory diagram of an embodiment of the present invention.
【図２】 本発明の実施形態の説明図FIG. 2 is an explanatory diagram of an embodiment of the present invention.
【図３】 本発明の実施形態の説明図FIG. 3 is an explanatory view of an embodiment of the present invention.
【図４】 本発明の実施形態の説明図FIG. 4 is an explanatory view of an embodiment of the present invention.
【図５】 従来の問題点を説明する説明図FIG. 5 is an explanatory diagram for explaining a conventional problem.
【図６】 従来の問題点を説明する説明図FIG. 6 is an explanatory diagram for explaining a conventional problem.
【図７】 従来の発光ディスプレイの説明図FIG. 7 is an explanatory view of a conventional light emitting display.
【図８】 発光素子の等価回路を示す図FIG. 8 is a diagram showing an equivalent circuit of a light-emitting element.
１ 陰極線走査回路 ２ 陽極線ドライブ回路 ２1〜２m 駆動源（定電流源） ３1〜３n 走査スイッチ ４ ドライブスイッチ ５ 陽極線接続ライン 10 発光制御回路 Ａ1〜Ａm 陽極線（ドライブ線） Ｂ1〜Ｂn 陰極線（走査線） Ｅ1,1〜Ｅｍ,ｎ 発光素子 Ｖｃｃ 逆バイアス電圧（定電圧源） DESCRIPTION OF SYMBOLS 1 Cathode line scanning circuit 2 Anode line drive circuit 21-2m Drive source (constant current source) 31-3n Scan switch 4 Drive switch 5 Anode line connection line 10 Light emission control circuit A1-Am Anode line (drive line) B1-Bn Cathode line ( Scan line) E1,1 to Em, n Light emitting element Vcc Reverse bias voltage (constant voltage source)
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０５Ｂ 33/14 Ｈ０５Ｂ 33/14 Ａ 33/26 33/26 Ｚ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H05B 33/14 H05B 33/14 A 33/26 33/26 Z
Claims (9)
に対してその各交点位置において発光素子を接続し、前
記陽極線及び陰極線のいずれか一方を走査線とするとと
もに他方をドライブ線とし、走査線を走査しながら、該
走査に応じて所望のドライブ線に駆動源を接続すること
により走査線とドライブ線の交点位置に接続された発光
素子を発光させるようにした発光ディスプレイであっ
て、 前記ドライブ線と他の前記ドライブ線を接続可能とする
接続手段を設けたことを特徴とする発光ディスプレイ。1. A light emitting element is connected to an anode line and a cathode line arranged in a matrix at respective intersections thereof, and one of the anode line and the cathode line is used as a scanning line, and the other is used as a drive line. A light emitting display configured to cause a light emitting element connected at an intersection of the scan line and the drive line to emit light by connecting a drive source to a desired drive line according to the scan while scanning the line, A light-emitting display, further comprising a connecting means for connecting a drive line to another drive line.
に対してその各交点位置において発光素子を接続し、前
記陽極線及び陰極線のいずれか一方を走査線とするとと
もに他方をドライブ線とし、走査線を走査しながら、該
走査に応じて所望のドライブ線に駆動源を接続すること
により走査線とドライブ線の交点位置に接続された発光
素子を発光させるようにした発光ディスプレイであっ
て、前記走査線は走査されるときはアース手段に接続さ
れ走査されないときは定電圧源に接続され、前記ドライ
ブ線は前記発光素子を発光させるときは前記駆動源に接
続され前記発光素子を発光させないときはアース手段に
接続され、 前記ドライブ線と他の前記ドライブ線を接続可能とする
接続手段を設けたことを特徴とする発光ディスプレイ。2. An anode line and a cathode line arranged in a matrix are connected to a light emitting element at each intersection point thereof, and one of the anode line and the cathode line is used as a scanning line, and the other is used as a drive line. A light emitting display configured to cause a light emitting element connected at an intersection of the scanning line and the drive line to emit light by connecting a driving source to a desired drive line in accordance with the scanning while scanning the line; The scanning line is connected to a grounding means when scanning, and is connected to a constant voltage source when not scanning, and the drive line is connected to the driving source when the light emitting element emits light, and when the light emitting element is not emitted. A light-emitting display, further comprising a connection means connected to a ground means, and capable of connecting the drive line to another drive line.
が接続可能とされる接続ラインを含んでなることを特徴
とする請求項１または請求項２に記載の発光ディスプレ
イ。3. The light emitting display according to claim 1, wherein said connection means includes connection lines to which all of said drive lines can be connected.
行われる前走査期間が終了し次の走査線の走査が行われ
る次走査期間に切り換わるまでのリセット期間におい
て、接続される発光素子のうち前記走査期間の走査対象
となる発光素子及び次走査期間の走査対象となる発光素
子のいずれか一方が発光するドライブ線を互いに接続す
るようにしたことを特徴とする請求項1ないしは３のい
ずれかに記載の発光ディスプレイ。4. The light-emitting device according to claim 1, wherein the connection unit is configured to emit light during a reset period from the end of a pre-scanning period in which scanning of an arbitrary scanning line is performed to a period of switching to a next scanning period in which scanning of a next scanning line is performed. 4. The device according to claim 1, wherein one of the light emitting elements to be scanned in the scanning period and the light emitting element to be scanned in the next scanning period are connected to each other by drive lines for emitting light. The light-emitting display according to any one of the above.
に接続された発光素子が発光状態かまたは非発光状態の
いずれであるかを記憶する第1の記憶手段と、前記次走
査期間において走査される走査線に接続された発光素子
が発光状態かまたは非発光状態のいずれであるかを記憶
する第２の記憶手段と、前記第1の記憶手段及び第２の
記憶手段の記憶内容に基づいて、前記リセット期間にお
ける接続手段の動作を制御する制御手段とを備えたこと
を特徴とする請求項４に記載の発光ディスプレイ。5. A first storage means for storing whether a light emitting element connected to a scanning line scanned in the scanning period is in a light emitting state or a non-light emitting state, and is scanned in the next scanning period. A second storage unit for storing whether the light-emitting element connected to the scanning line is in a light-emitting state or a non-light-emitting state; and based on storage contents of the first storage unit and the second storage unit. 5. The light emitting display according to claim 4, further comprising control means for controlling an operation of the connection means during the reset period.
でなることを特徴とする請求項１ないしは５のいずれか
に記載の発光ディスプレイ。6. The light emitting display according to claim 1, wherein the light emitting element includes an organic EL material.
に対してその各交点位置において発光素子を接続し、前
記陽極線及び陰極線のいずれか一方を走査線とするとと
もに他方をドライブ線とし、走査線を走査しながら、該
走査に応じて所望のドライブ線に駆動源を接続すること
により走査線とドライブ線の交点位置に接続された発光
素子を発光させるようにした発光ディスプレイの駆動方
法であって、 任意の走査線の走査が行われる前走査期間が終了し次の
走査線の走査が行われる次走査期間に切り換わるまでの
リセット期間において、接続される発光素子のうち前記
走査期間の走査対象となる発光素子及び次走査期間の走
査対象となる発光素子のいずれか一方が発光するドライ
ブ線を互いに接続するようにしたことを特徴とする発光
ディスプレイの駆動方法。7. An anode line and a cathode line arranged in a matrix are connected to a light emitting element at each intersection point thereof, and one of the anode line and the cathode line is set as a scanning line and the other is set as a drive line, and scanning is performed. A method of driving a light-emitting display in which a drive source is connected to a desired drive line in accordance with the scanning while scanning the line, thereby causing a light-emitting element connected at the intersection of the scan line and the drive line to emit light. During the reset period from the end of the pre-scanning period in which scanning of an arbitrary scanning line is performed to the time of switching to the next scanning period in which the scanning of the next scanning line is performed, the scanning of the connected light emitting elements during the scanning period is performed. A drive line for emitting one of the light emitting element to be scanned and the light emitting element to be scanned in the next scanning period is connected to each other. The driving method of play.
においては、走査がなされている走査線はアース手段に
接続されるとともに走査がなされない走査線は定電圧源
に接続され、発光される発光素子が接続されるドライブ
線は前記駆動源に接続されるとともに発光がなされない
発光素子が接続されるドライブ線はアース手段に接続さ
れることを特徴とする請求項７に記載の発光ディスプレ
イの駆動方法。8. In a scanning period in which scanning of an arbitrary scanning line is performed, a scanning line being scanned is connected to ground means, and a scanning line not being scanned is connected to a constant voltage source to emit light. 8. The light emitting display according to claim 7, wherein a drive line to which a light emitting element is connected is connected to the drive source, and a drive line to which a light emitting element which does not emit light is connected is connected to ground means. Drive method.
でなることを特徴とする請求項７または８に記載の発光
ディスプレイの駆動方法。9. The method according to claim 7, wherein the light emitting element includes an organic EL material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09481199A JP3686280B2 (en) | 1999-04-01 | 1999-04-01 | Light emitting display and driving method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09481199A JP3686280B2 (en) | 1999-04-01 | 1999-04-01 | Light emitting display and driving method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000284721A true JP2000284721A (en) | 2000-10-13 |
| JP3686280B2 JP3686280B2 (en) | 2005-08-24 |
Family
ID=14120450
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09481199A Expired - Fee Related JP3686280B2 (en) | 1999-04-01 | 1999-04-01 | Light emitting display and driving method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3686280B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003076324A (en) * | 2001-09-04 | 2003-03-14 | Konica Corp | Organic el display device and its driving method |
| JP2006518859A (en) * | 2002-10-28 | 2006-08-17 | トムソン ライセンシング | Image display device with capacitive energy recovery |
| CN1319419C (en) * | 2001-11-06 | 2007-05-30 | 精工爱普生株式会社 | Electric optical device, film component, laminated film low refractive index film |
| KR100884789B1 (en) | 2003-04-04 | 2009-02-23 | 삼성모바일디스플레이주식회사 | Method and apparatus for driving electro-luminescence display panel wherein preliminary charging is individually performed |
| KR100903100B1 (en) * | 2003-01-30 | 2009-06-16 | 삼성모바일디스플레이주식회사 | Method for driving Electro-Luminescence display panel for reducing crosstalk due to preliminary charging |
| KR100903099B1 (en) | 2003-04-15 | 2009-06-16 | 삼성모바일디스플레이주식회사 | Method of driving Electro-Luminescence display panel wherein booting is efficiently performed, and apparatus thereof |
| US8654040B2 (en) | 2002-09-18 | 2014-02-18 | Seiko Epson Corporation | Electro-optical device, matrix substrate, and electronic equipment |
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1999
- 1999-04-01 JP JP09481199A patent/JP3686280B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003076324A (en) * | 2001-09-04 | 2003-03-14 | Konica Corp | Organic el display device and its driving method |
| CN1319419C (en) * | 2001-11-06 | 2007-05-30 | 精工爱普生株式会社 | Electric optical device, film component, laminated film low refractive index film |
| US8654040B2 (en) | 2002-09-18 | 2014-02-18 | Seiko Epson Corporation | Electro-optical device, matrix substrate, and electronic equipment |
| JP2006518859A (en) * | 2002-10-28 | 2006-08-17 | トムソン ライセンシング | Image display device with capacitive energy recovery |
| US7965262B2 (en) | 2002-10-28 | 2011-06-21 | Thomson Licensing | Display device with capacitive energy recovery |
| KR100903100B1 (en) * | 2003-01-30 | 2009-06-16 | 삼성모바일디스플레이주식회사 | Method for driving Electro-Luminescence display panel for reducing crosstalk due to preliminary charging |
| KR100884789B1 (en) | 2003-04-04 | 2009-02-23 | 삼성모바일디스플레이주식회사 | Method and apparatus for driving electro-luminescence display panel wherein preliminary charging is individually performed |
| KR100903099B1 (en) | 2003-04-15 | 2009-06-16 | 삼성모바일디스플레이주식회사 | Method of driving Electro-Luminescence display panel wherein booting is efficiently performed, and apparatus thereof |
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|---|---|
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