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US 10,380,941 B2Granted
OLED pixel circuit and display device thereof
AssigneeBoe Technology Group Co., Ltd.
InventorChen Song
Life of this patent
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Abstract
An OLED pixel circuit and a display apparatus comprising the OLED pixel circuit. An OLED pixel circuit comprises an OLED and driving units (TFT1, S1, C) for driving the OLED to emit light, wherein one electrode of the OLED is connected to the driving units (TFT1, S1, C). The OLED pixel circuit further comprises compensation units (R1, S2, TFT2, R2). The compensation units (R1, S2, TFT2, R2) comprises a sensing element (R1) which can sense light and convert an optical signal of the OLED into an electrical signal. The compensation units (R1, S2, TFT2, R2) compensate for currents used by the driving units (TFT1, S1, C) to drive the OLED according to the light-emitting brightness of the OLED.
Claims18
An OLED pixel circuit, comprising
- an OLED and
- a driving unit for driving the OLED to emit light, wherein one electrode of the OLED is coupled to the driving unit, and
- a compensation unit, comprising a sensor, wherein the sensor is configured to sense light and convert an optical signal of the OLED into an electrical signal, wherein the compensation unit is configured to compensate a current of the driving unit for driving the OLED according to a light-emitting brightness of the OLED,
- wherein the sensor is a photoresistor, the compensation unit further comprises a synchronous transistor, a compensation driving transistor and a voltage divider resistor, wherein
- the photoresistor is coupled to the voltage divider resistor in series to form a series branch, a first terminal of the series branch is a constraint terminal and is coupled to the synchronous transistor, a second terminal of the series branch is a free terminal and coupled to a second reference voltage terminal;
- a control electrode of the synchronous transistor is coupled to a scan signal terminal, a first electrode of the synchronous transistor is coupled to the constraint terminal of the series branch, and a second electrode of the synchronous transistor is coupled to a first reference voltage terminal;
- a control electrode of the compensation driving transistor is coupled to a series coupling point of the photoresistor and the voltage divider resistor, a first electrode of the compensation driving transistor is coupled to a first voltage input terminal or a cathode of the OLED, a second electrode of the compensation driving transistor is coupled to an anode of the OLED or a second voltage input terminal;
- and
- a first reference voltage at the first reference voltage terminal is larger than a second reference voltage at the second reference voltage terminal, and the second reference voltage is smaller than a turn-on voltage of the OLED.
6 more elements
A display device, comprising an OLED pixel circuit, wherein the OLED pixel circuit comprises
- an OLED,
- a driving unit for driving the OLED to emit light, wherein one electrode of the OLED is coupled to the driving unit, and
- a compensation unit, comprising a sensor, wherein the sensor is configured to sense light and convert an optical signal of the OLED into an electrical signal, wherein the compensation unit is configured to compensate a current of the driving unit for driving the OLED according to a light-emitting brightness of the OLED,
- wherein the sensor is a photoresistor, the compensation unit further comprises a synchronous transistor, a compensation driving transistor and a voltage divider resistor, wherein
- the photoresistor is coupled to the voltage divider resistor in series to form a series branch, a first terminal of the series branch is a constraint terminal and is coupled to the synchronous transistor, a second terminal of the series branch is a free terminal and coupled to a second reference voltage terminal;
- a control electrode of the synchronous transistor is coupled to a scan signal terminal, a first electrode of the synchronous transistor is coupled to the constraint terminal of the series branch, and a second electrode of the synchronous transistor is coupled to a first reference voltage terminal;
- a control electrode of the compensation driving transistor is coupled to a series coupling point of the photoresistor and the voltage divider resistor, a first electrode of the compensation driving transistor is coupled to a first voltage input terminal or a cathode of the OLED, a second electrode of the compensation driving transistor is coupled to an anode of the OLED or a second voltage input terminal;
- and
- a first reference voltage at the first reference voltage terminal is larger than a second reference voltage at the second reference voltage terminal, and the second reference voltage is smaller than a turn-on voltage of the OLED.
6 more elements
Dependencies are inferred from the claim text.