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CN-122024634-A - Pixel circuit and vehicle-mounted display

CN122024634ACN 122024634 ACN122024634 ACN 122024634ACN-122024634-A

Abstract

The pixel circuit comprises a light emitting element, a receiving circuit, an energy storage element, a driving circuit, a light emitting control circuit and a first compensation circuit, wherein the receiving circuit is configured to receive a data signal according to a scanning signal, the energy storage element is electrically connected between the receiving circuit and the driving circuit, the driving circuit is configured to receive a second voltage and generate a driving current, the light emitting control circuit is configured to provide the driving current for the light emitting element according to the light emitting control signal, and the first compensation circuit comprises a first transistor, a second transistor and a third transistor and is configured to provide a first compensation voltage or a second compensation voltage in different operation stages so that the driving circuit generates the driving current. The in-vehicle display includes a plurality of the pixel circuits.

Inventors

  • CHEN YIQIAN
  • CHEN JUNYU

Assignees

  • 友达光电股份有限公司

Dates

Publication Date
20260512
Application Date
20260320
Priority Date
20250917

Claims (12)

  1. 1. A pixel circuit, which comprises a pixel circuit and a pixel electrode, characterized by comprising the following steps: A light emitting element comprising: A first end, a A second terminal configured to receive a first voltage; A receiving circuit configured to receive a data signal according to a scan signal; The energy storage element is electrically connected with the receiving circuit and is connected with a first node; The driving circuit is electrically connected with the energy storage element and is arranged to receive a second voltage and generate a driving current; a light emitting control circuit electrically connected to a third node and the first end of the light emitting element, the light emitting control circuit configured to provide the driving current to the light emitting element according to a light emitting control signal, and A first compensation circuit, comprising: A first transistor, comprising: A first end; a second terminal configured to receive the first voltage, and A control terminal configured to receive a reset signal; a second transistor, comprising: A first end electrically connected to the first end of the first transistor; A second end electrically connected to the second node, and A control terminal configured to receive the scan signal, and A third transistor, comprising: A first end electrically connected to the first end of the first transistor; A second end electrically connected to the third node, and A control terminal configured to receive the scan signal.
  2. 2. The pixel circuit of claim 1 wherein, in response to a first phase of operation, the reset signal and the scan signal are at an enable level, the light-emitting control signal is at a disable level, the receiving circuit is enabled to enable the first node to have the voltage of the data signal, and the first transistor, the second transistor, and the third transistor are turned on to enable the second node to have the first voltage.
  3. 3. The pixel circuit of claim 1 wherein, in response to a second phase of operation, the scan signal is at an enable level, the reset signal and the light emission control signal are at a disable level, the receiving circuit is enabled to enable the first node to have the voltage of the data signal, the second transistor and the third transistor are turned on to enable the second node to have a first compensation voltage, and the driving circuit generates the driving current to flow through the turned-on second transistor and third transistor according to the first compensation voltage.
  4. 4. A pixel circuit as claimed in claim 3, further comprising a second compensation circuit, the second compensation circuit comprising: a fourth transistor, comprising: A first terminal configured to receive a third voltage; a second end electrically connected to the first node, and A control terminal configured to receive the light emission control signal; The fourth transistor is turned on to enable the first node to have the third voltage and the second node to have a second compensation voltage in response to a third operation stage, the driving circuit generates the driving current according to the second compensation voltage, and the light emission control circuit is enabled to enable the driving current to flow through the light emitting element to emit light.
  5. 5. The pixel circuit of claim 4 wherein the second compensation voltage is the third voltage plus the first compensation voltage minus the voltage of the data signal.
  6. 6. A pixel circuit as claimed in claim 3, characterized in that the drive circuit comprises: A fifth transistor, comprising: a first terminal configured to receive the second voltage; A second end electrically connected to the third node, and The control end is electrically connected with the second node; the first compensation voltage is the difference between the absolute values of the threshold voltages of the second and fifth transistors.
  7. 7. The pixel circuit of claim 1, wherein the receiving circuit comprises: A sixth transistor, comprising: a first terminal configured to receive the data signal; a second end electrically connected to the first node, and A control terminal configured to receive the scan signal.
  8. 8. The pixel circuit according to claim 1, wherein the light emission control circuit includes: A seventh transistor, comprising: a first end electrically connected to the third node; a second end electrically connected to the first end of the light emitting element, and A control terminal configured to receive the light emission control signal.
  9. 9. The pixel circuit of claim 1, further comprising a test circuit electrically connected to the light emission control circuit, the test circuit configured to determine whether the driving circuit is normal according to a test control signal.
  10. 10. The pixel circuit of claim 9 wherein, in response to a fourth phase of operation, the light-emission control signal and the test control signal are at an enable level, the reset signal and the scan signal are at a disable level, and the test circuit determines whether the driving circuit is normal based on the driving current flowing through the light-emission control circuit.
  11. 11. The pixel circuit of claim 9, wherein the test circuit comprises: an eighth transistor comprising: a first end electrically connected to the light-emitting control circuit; A second end A control terminal configured to receive the test control signal.
  12. 12. A vehicle-mounted display, comprising: a display panel disposed in a vehicle body and comprising a plurality of pixel circuits according to any one of claims 1 to 11.

Description

Pixel circuit and vehicle-mounted display Technical Field The present disclosure relates to a pixel circuit and an in-vehicle display, and more particularly, to a pixel circuit including a compensation threshold voltage and an in-vehicle display including the plurality of pixel circuits. Background Electroluminescent display devices are classified into inorganic light emitting display devices and organic light emitting display devices according to materials of light emitting layers. The active matrix type inorganic light emitting display device comprises self-emitting light emitting diodes (such as sub-millimeter light emitting diodes (Mini-LEDs), micro-light emitting diodes (Micro-LEDs) and the like), wherein the light emitting layer material is composed of gallium nitride or other III-V semiconductor materials, and compared with organic materials, the active matrix type inorganic light emitting display device has the advantages of better stability, longer service life, difficult aging, no burn-in and the like, and is a key development technology of new generation light emitting display devices. The light emitting diode display device generates a driving current by using a pixel circuit to drive a light emitting diode as a pixel unit to emit light so as to display a picture. The drive current is related to the received data voltage and the threshold voltage of the drive transistor that generated the drive current. However, due to process factors, the driving transistor has a threshold voltage shift to affect the actual brightness of the light emitting diode, thereby causing non-uniformity of the light emitting brightness of each light emitting diode. Disclosure of Invention It is an object of the present disclosure to provide a pixel circuit and a vehicle-mounted display, wherein the pixel circuit can compensate the threshold voltage of a transistor. Further, the number of signals required by the pixel circuit is reduced, so that the circuit layout area is reduced, and the aperture ratio and the transmittance of the pixel are improved. In order to achieve the above objective, an aspect of the present disclosure provides a pixel circuit, which includes a light emitting element, a receiving circuit, a storage element, a driving circuit, a light emission control circuit, and a first compensation circuit. The light emitting element includes a first end and a second end, and the second end is configured to receive a first voltage. The receiving circuit is configured to receive a data signal according to the scan signal. The energy storage element and the receiving circuit are electrically connected to the first node. The driving circuit and the energy storage element are electrically connected to the second node and are configured to receive a second voltage and generate a driving current. The light-emitting control circuit and the driving circuit are electrically connected to the third node and the first end of the light-emitting element. The light-emitting control circuit is configured to supply a driving current to the light-emitting element according to the light-emitting control signal. The first compensation circuit comprises a first transistor, a second transistor and a third transistor. The first transistor includes a first terminal, a second terminal configured to receive a first voltage, and a control terminal configured to receive a reset signal. The second transistor includes a first end electrically connected to the first end of the first transistor, a second end electrically connected to the second node, and a control end configured to receive the scan signal. The third transistor includes a first end electrically connected to the first end of the first transistor, a second end electrically connected to the third node, and a control end configured to receive the scan signal. According to some embodiments of the present disclosure, in response to the first operation stage, the reset signal and the scan signal are at an enable level, the light emission control signal is at a disable level, the receiving circuit is enabled to enable the first node to have a voltage of the data signal, and the first transistor, the second transistor, and the third transistor are turned on to enable the second node to have the first voltage. According to some embodiments of the disclosure, in response to the second operation stage, the scan signal is at the enable level, the reset signal and the light emission control signal are at the disable level, the receiving circuit is enabled to enable the first node to have the voltage of the data signal, the second transistor and the third transistor are turned on to enable the second node to have the first compensation voltage, and the driving circuit generates the driving current to flow through the turned-on second transistor and third transistor according to the first compensation voltage. According to some embodiments of the present disclosure, the pixel circuit further i