JP2011112722A5

JP2011112722A5 -

Info

Publication number: JP2011112722A5
Application number: JP2009266733A
Authority: JP
Filing date: 2009-11-24
Publication date: 2012-12-20

Description

本発明の第１の表示装置は、一組の発光素子および画素回路が２次元配置された表示部と、画素回路を駆動する駆動部とを備えたものである。画素回路は、２つのトランジスタ（第１トランジスタ，第２トランジスタ）を有している。第１トランジスタは、第１ゲートおよび第２ゲートを含んでおり、発光素子に流れる電流を制御するデュアルゲート型のトランジスタである。一方、第２トランジスタは、映像信号に応じた信号電圧を第１ゲートに書き込むトランジスタである。駆動部は、第発光素子を発光させていない時と、発光素子を発光させている時とで、第２ゲートに印加する電圧を異ならせるようになっている。
本発明の第２の表示装置は、一組の発光素子および画素回路が２次元配置された表示部と、複数の書込線、複数の信号線、および複数のバックゲート線を駆動する駆動部とを備えたものである。画素回路は、第１トランジスタと、第２トランジスタと、容量とを有している。第１トランジスタは、第１ゲートおよび第２ゲートを含み、かつ第１トランジスタの第１ゲート電位とソース電位の電位差および第２ゲート電位に応じて発光素子に流れる電流を制御するようになっている。一方、第２トランジスタは、映像信号に応じた信号電圧を容量に書き込むようになっている。駆動部は、信号線の電圧が信号電圧となっている間に、書込線の電圧を第２トランジスタが導通する電圧に切り替えて第１ゲートを信号線に電気的に接続し、発光素子の発光前に第１トランジスタを介して容量に電流を流して、第１ゲート電位とソース電位との電位差を減少させる補正動作を行うようになっている。駆動部は、さらに、補正動作時と、発光素子を発光させている時とで、第２ゲートに印加する電圧を異ならせるようになっている。
本発明の第３の表示装置は、一組の発光素子および画素回路が２次元配置された表示部と画素回路を駆動する駆動部とを備えたものである。画素回路は、２つのトランジスタ（第１トランジスタ，第２トランジスタ）を有している。第１トランジスタは、第１ゲートおよび第２ゲートを含んでおり、発光素子に流れる電流を制御するデュアルゲート型のトランジスタである。一方、第２トランジスタは、映像信号に応じた信号電圧を第１ゲートに書き込むトランジスタである。駆動部は、画素回路に信号電圧を供給する信号線駆動回路と、第２トランジスタの導通状態を制御する書込線駆動回路と、画素回路の第２ゲートに電圧を供給する第２ゲート線駆動回路とを有している。第２ゲート線駆動回路は、発光素子を発光させていない時と、発光素子を発光させている時とで、第２ゲートに印加する電圧を異ならせるようになっている。 The first display device of the present invention are those having a display portion which a pair of light emitting elements and pixel circuits are arranged two-dimensionally, and a driving unit for driving the picture element circuit. The pixel circuit has two transistors (a first transistor and a second transistor). The first transistor includes a first gate and a second gate, and is a dual gate type transistor that controls a current flowing through the light emitting element. On the other hand, the second transistor is a transistor that writes a signal voltage corresponding to the video signal to the first gate. The drive unit is configured to vary the voltage applied to the second gate depending on whether the first light emitting element is not emitting light and when the light emitting element is emitting light.
A second display device of the present invention includes a display unit in which a set of light emitting elements and pixel circuits are two-dimensionally arranged, and a drive unit that drives a plurality of write lines, a plurality of signal lines, and a plurality of back gate lines. It is equipped with. The pixel circuit has a first transistor, a second transistor, and a capacitor. The first transistor includes a first gate and a second gate, and controls the current flowing through the light emitting element in accordance with the potential difference between the first gate potential and the source potential of the first transistor and the second gate potential. . On the other hand, the second transistor writes a signal voltage corresponding to the video signal in the capacitor. While the voltage of the signal line is the signal voltage, the driving unit switches the voltage of the writing line to a voltage at which the second transistor is turned on to electrically connect the first gate to the signal line. A correction operation is performed to reduce the potential difference between the first gate potential and the source potential by flowing a current through the capacitor through the first transistor before light emission. Further, the drive unit is configured to make the voltage applied to the second gate different between the correction operation and the light emitting element emitting light.
A third display device of the present invention includes a display unit in which a set of light emitting elements and a pixel circuit are two-dimensionally arranged, and a drive unit that drives the pixel circuit. The pixel circuit has two transistors (a first transistor and a second transistor). The first transistor includes a first gate and a second gate, and is a dual gate type transistor that controls a current flowing through the light emitting element. On the other hand, the second transistor is a transistor that writes a signal voltage corresponding to the video signal to the first gate. The driving unit includes a signal line driving circuit that supplies a signal voltage to the pixel circuit, a writing line driving circuit that controls a conduction state of the second transistor, and a second gate line driving that supplies a voltage to the second gate of the pixel circuit. Circuit. The second gate line driving circuit is configured to vary the voltage applied to the second gate when the light emitting element is not emitting light and when the light emitting element is emitting light.

本発明の表示装置の駆動方法は、以下の２つのステップを含むものである。
（Ａ）以下の構成を備えた表示装置を用意するステップ
（Ｂ）駆動部を用いて、発光素子を発光させていない時に第２ゲートに第１電圧を印加したのち、発光素子を発光させている時に第２ゲートに第１電圧とは大きさの異なる第２電圧を印加するステップ The display device driving method of the present invention includes the following two steps.
(A) Step of preparing a display device having the following configuration (B) Using the drive unit, when the light emitting element is not emitting light , applying a first voltage to the second gate, and then causing the light emitting element to emit light Applying a second voltage having a magnitude different from the first voltage to the second gate when

本発明の第１の表示装置およびその駆動方法ならびに電子機器では、発光素子を発光させていない時と、発光素子を発光させている時とで、第１トランジスタの第２ゲートに印加する電圧が異なっている。これにより、第１ゲートに書き込む信号電圧の大きさを大きくする代わりに、第２ゲートに印加する電圧を適切に調整することにより、発光素子に流れる電流を大きくすることができる。 In the first display device and a driving method and an electronic apparatus of the present invention, and when not emit light emitting element, at a time that causes the light emitting element, a voltage applied to the second gate of the first transistor Is different. Accordingly, the current flowing through the light emitting element can be increased by appropriately adjusting the voltage applied to the second gate instead of increasing the magnitude of the signal voltage written to the first gate.

本発明の第１の表示装置およびその駆動方法ならびに電子機器によれば、第１ゲートに書き込む信号電圧の大きさを大きくする代わりに、第２ゲートに印加する電圧を適切に調整することにより、発光素子に流れる電流を大きくすることができるようにした。これにより、第１ゲートに書き込む信号電圧を大きくしなくても、高輝度を得ることができるので、移動度μの補正に適した時間ｔを過度に短くすることなく、高輝度化を実現することができる。 According to the first display device and the driving method and electronic apparatus of the present invention, by appropriately adjusting the voltage applied to the second gate instead of increasing the magnitude of the signal voltage written to the first gate, The current flowing through the light emitting element can be increased. As a result, high luminance can be obtained without increasing the signal voltage written to the first gate, so that high luminance can be realized without excessively shortening the time t suitable for correcting the mobility μ. be able to.

Claims

A display unit in which a set of light emitting elements and pixel circuits are two-dimensionally arranged;
And a driving unit for driving the pixel circuit,
The pixel circuit includes a first gate and second gate, and writes a first transistor of the dual gate type for controlling a current flowing through the light emitting element, a signal voltage corresponding to movies image signal to the first gate first Two transistors,
The display device according to claim 1, wherein the driving unit varies a voltage applied to the second gate depending on whether the light emitting element is not emitting light and when the light emitting element is emitting light.

The driving unit varies a voltage applied to the second gate depending on threshold correction of the first transistor and when the light emitting element emits light.
The display device according to claim 1.

The driving unit varies a voltage applied to the second gate between threshold correction and mobility correction of the first transistor and when the light emitting element emits light.
The display device according to claim 1.

The pixel circuit includes a switching element that controls electrical connection between the terminal on the first transistor side of the light emitting element and the second gate, and a connection point between the first transistor and the switching element. The display device according to claim 1, further comprising a capacitive element between the driving unit and the driving unit.

The display according to claim 3 , wherein the driving unit turns on the switching element during at least threshold correction and mobility correction of the first transistor, and turns off the switching element after light emission is started. apparatus.

When the first transistor is an n-channel type, the driving unit applies a voltage applied to the second gate when the light emitting element is emitting light, and performs threshold correction and mobility correction of the first transistor. performing display device according to any one of claims 3 to 5 higher than the voltage applied to the second gate when being.

When the first transistor is a p-channel type, the driving unit applies a voltage applied to the second gate when the light emitting element is emitting light, and performs threshold correction and mobility correction of the first transistor. performing display device according to any one of claims 3 to 5 lower than the voltage applied to the second gate when being.

A display unit in which a set of light emitting elements and pixel circuits are two-dimensionally arranged;
A drive unit for driving a plurality of write lines, a plurality of signal lines, and a plurality of back gate lines;
With
The pixel circuit includes a first transistor, a second transistor, and a capacitor.
The first transistor includes a first gate and a second gate, and controls a current flowing through the light emitting element according to a potential difference between a first gate potential and a source potential of the first transistor and a second gate potential,
The second transistor writes a signal voltage corresponding to the video signal to the capacitor,
The drive unit switches the voltage of the write line to a voltage at which the second transistor is turned on while the voltage of the signal line is the signal voltage, and electrically connects the first gate to the signal line. And performing a correction operation to reduce a potential difference between the first gate potential and the source potential by causing a current to flow through the capacitor through the first transistor before the light emitting element emits light.
The driving unit varies a voltage applied to the second gate between the correction operation and when the light emitting element emits light.
Display device.

A display unit in which a set of light emitting elements and pixel circuits are two-dimensionally arranged;
A drive unit for driving the pixel circuit;
With
The pixel circuit includes a first gate and a second gate and a first transistor of a dual gate type that controls a current flowing through the light emitting element, and a second that writes a signal voltage corresponding to a video signal to the first gate A transistor,
The driving unit supplies a voltage to a signal line driving circuit that supplies the signal voltage to the pixel circuit, a writing line driving circuit that controls a conduction state of the second transistor, and a second gate of the pixel circuit. A second gate line driving circuit;
The second gate line driving circuit varies a voltage applied to the second gate between when the light emitting element is not emitting light and when the light emitting element is emitting light.
Display device.

A display unit in which a set of light emitting elements and a pixel circuit are two-dimensionally arranged, and a drive unit that drives the pixel circuit based on a video signal, the pixel circuit including a first gate and a second gate; And providing a light-emitting device having a dual-gate first transistor that controls a current flowing through the light-emitting element and a second transistor that writes a signal voltage corresponding to the video signal to the first gate;
Using the drive unit, after the first voltage is applied to the light-emitting element at the second gate no light is emitted, the size and the first voltage to the second gate when it is caused to emit the light emitting element Applying a second voltage having a different length. A method for driving a display device.

A display device,
The display device
A display unit in which a set of light emitting elements and pixel circuits are two-dimensionally arranged;
A drive unit for driving the pixel circuit based on a video signal,
The pixel circuit includes a first gate and a second gate, and a dual gate type first transistor that controls a current flowing through the light emitting element, and a first voltage that writes a signal voltage corresponding to the video signal to the first gate. Two transistors,
The electronic device in which the driving unit varies a voltage applied to the second gate depending on whether the light emitting element is not emitting light and when the light emitting element is emitting light.