Organic light-emitting diode pixel circuit and driving method thereof

Patent metadata

Field	Value
Publication number	US-9570010-B2
Application number	US-201414654019-A
Country	US
Kind code	B2
Filing date	Nov 11, 2014
Priority date	Jun 23, 2014
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

The present invention can solve the problem that an existing organic light-emitting diode pixel circuit has a single function or a complicated structure. An organic light-emitting diode pixel circuit of the present invention includes: a touch fingerprint detection module configured to detect whether a touch occurs or not and whether the touch is caused by a convex portion of a fingerprint or a concave portion of the fingerprint, and send a result of the detection to a read line, under the control of a first scanning signal and a second scanning signal; and a compensation display module including an organic light-emitting diode and at least one driving transistor, and configured to eliminate a shift of a threshold voltage of the driving transistor and drive the organic light-emitting diode to display under the control of at least the first scanning signal, the second scanning signal, and a data signal.

First claim

What is claimed is:

1. An organic light-emitting diode pixel circuit, comprising:
a touch fingerprint detection module, which is configured to detect whether a touch occurs or not and whether the touch is caused by a convex portion of a fingerprint or a concave portion of the fingerprint, and send a result of the detection to a read line, under the control of a first scanning signal and a second scanning signal; and
a compensation display module comprising an organic light-emitting diode and at least one driving transistor, and is configured to eliminate a shift of a threshold voltage of the at least one driving transistor and drive the organic light-emitting diode to display under the control of at least the first scanning signal, the second scanning signal, and a data signal, wherein,
the touch fingerprint detection module comprises a detecting capacitor, a first detecting transistor, a second detecting transistor, and a third detecting transistor,
the detecting capacitor comprises a first electrode for sensing a touch and a second electrode opposite to the first electrode, and the second electrode of the detecting capacitor is used for receiving the second scanning signal,
a gate of the first detecting transistor is used for receiving the first scanning signal, a first electrode thereof is used for receiving a reference voltage, and a second electrode thereof is connected to the first electrode of the detecting capacitor,
a gate of the second detecting transistor is connected to the first electrode of the detecting capacitor, a first electrode thereof is used for receiving the reference voltage, and a second electrode thereof is connected to a first electrode of the third detecting transistor, and
a gate of the third detecting transistor is used for receiving the second scanning signal, and a second electrode thereof is connected to the read line.

2. The organic light-emitting diode pixel circuit according to claim 1 , wherein,
the compensation display module comprises a first storage capacitor, the organic light-emitting diode, a first driving transistor, a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor, and a fifth switch transistor, wherein, the first driving transistor, all of the switch transistors, and all of the detecting transistors are N-type thin film transistors, and
the first storage capacitor comprises a first electrode and a second electrode;
a cathode of the organic light-emitting diode is grounded;
a gate of the first driving transistor is connected to the second electrode of the first storage capacitor, and a first electrode thereof is connected to an anode of the organic light-emitting diode;
a gate of the first switch transistor is used for receiving the second scanning signal, a first electrode thereof is connected to a second electrode of the first driving transistor, and a second electrode thereof is used for receiving a supply voltage;
a gate of the second switch transistor is used for receiving the first scanning signal, a first electrode thereof is connected to the second electrode of the first storage capacitor, and a second electrode thereof is connected to the second electrode of the first driving transistor;
a gate of the third switch transistor is used for receiving the first scanning signal, a first electrode thereof is used for receiving the data signal, and a second electrode thereof is connected to the first electrode of the first storage capacitor;
a gate of the fourth switch transistor is used for receiving the second scanning signal, a first electrode thereof is connected to the first electrode of the first storage capacitor, and a second electrode thereof is connected to the anode of the organic light-emitting diode; and
a gate of the fifth switch transistor is used for receiving the first scanning signal, a first electrode thereof is grounded, and a second electrode thereof is connected to the anode of the organic light-emitting diode.

3. A driving method for the organic light-emitting diode pixel circuit according to claim 2 , the driving method comprising:
resetting and charging both the touch fingerprint detection module and the compensation display module;
causing the compensation display module to obtain a correct compensation voltage;
causing the touch fingerprint detection module to detect a touch and output a result of the detection;
causing the compensation display module to emit light and display;
in a resetting stage, setting both the first scanning signal and the second scanning signal to a high level;
in a compensating stage, setting the first scanning signal to a high level, setting the second scanning signal to a low level, and using the data signal as a driving voltage for driving the organic light-emitting diode to display; and
in a reading and displaying stage, setting the first scanning signal to a low level, and setting the second scanning signal to a high level.

4. The driving method according to claim 3 , wherein, between the compensating stage and the reading and displaying stage, the driving method further comprising:
a buffering stage, in which both the first scanning signal and the second scanning signal are set to a low level.

5. The organic light-emitting diode pixel circuit according to claim 1 , wherein, the compensation display module comprises a second storage capacitor, the organic light-emitting diode, a second driving transistor, a sixth switch transistor, a seventh switch transistor, an eighth switch transistor, and a ninth switch transistor, wherein, the second driving transistor, all of the switch transistors, and all of the detecting transistors are N-type thin film transistors, and
the second storage capacitor comprises a first electrode and a second electrode;
a cathode of the organic light-emitting diode is grounded;
a gate of the second driving transistor is connected to the second electrode of the second storage capacitor, and a first electrode thereof is connected to an anode of the organic light-emitting diode;
a gate of the sixth switch transistor is used for receiving the second scanning signal, a first electrode thereof is connected to a second electrode of the second driving transistor, and a second electrode thereof is used for receiving a supply voltage;
a gate of the seventh switch transistor is used for receiving the first scanning signal, a first electrode thereof is connected to the second electrode of the second storage capacitor, and a second electrode thereof is connected to the second electrode of the second driving transistor;
a gate of the eighth switch transistor is used for receiving a control signal, a first electrode thereof is used for receiving the data signal, and a second electrode thereof is connected to the first electrode of the second storage capacitor; and
a gate of the ninth switch transistor is used for receiving the first scanning signal, a first electrode thereof is grounded, and a second electrode thereof is connected to the anode of the organic light-emitting diode.

6. A driving method for the organic light-emitting diode pixel circuit according to claim 5 , the driving method comprising:
resetting and charging both the touch fingerprint detection module and the compensation display module;
causing the compensation display module to obtain a correct compensation voltage;
causing the touch fingerprint detection module to detect a touch and output a result of the detection;
causing the compensation display module to emit light and display;
in a resetting stage, setting both the first scanning signal and the second scanning signal to a high level, and setting the control signal to a low level;
in a compensating stage, setting the first scanning signal to a high level, setting t

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Optoelectronics Tech Co Ltd

Inventors

• Yang Shengji

Classifications

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G2310/0251

  Precharge or discharge of pixel before applying new pixel voltage · CPC title

• G09G2354/00

  Aspects of interface with display user · CPC title

• G09G3/3258 Primary

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title

• G09G2320/045

  Compensation of drifts in the characteristics of light emitting or modulating elements · CPC title