PATENT CLAIM ANALYSIS

Application Number: 15936519
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2019-10
Patent Classification: ["345", "082000"]

Abstract:
A pixel circuit for a display device includes a drive transistor configured to control an amount of current to a light-emitting device depending upon a voltage applied to a gate of the drive transistor; a second transistor connected to the gate of the drive transistor and a second terminal of the drive transistor such that, when the second transistor is in an on state the drive transistor becomes diode-connected such that the gate and a second terminal of the drive transistor are connected through the second transistor; a light-emitting device that is connected at a first node to the second terminal of the drive transistor and at a second node to a first voltage supply; a third transistor that is connected between an initialization voltage supply and the first node of the light-emitting device, wherein a node N 1  is a connection of the second terminal of the drive transistor, the first node of the light-emitting device, and the third transistor; and at least one capacitor having a first plate that is connected to the gate of the drive transistor and a second plate that is connectable to a reference voltage supply. The pixel circuit is operable in an initialization phase to initialize circuit voltages, in a compensation phase to compensate for variations in drive transistor properties, in a programming phase to program a greyscale value to the pixel circuit, and in an emission phase in which the light-emitting device emits light corresponding to the greyscale value.

Claim (Index 12):
A method of operating a pixel circuit for a display device that is operable in an initialization phase, a compensation phase, a programming phase, and an emission phase; the operating method comprising the steps of:\n providing a pixel circuit comprising:\n a drive transistor configured to control an amount of current to the light-emitting device during the emission phase depending upon a voltage applied to a gate of the drive transistor; \n a second transistor connected to the gate of the drive transistor, wherein the drive transistor can be diode-connected between the gate and a second terminal of the drive transistor through the second transistor; \n a light-emitting device that is connected at a first node to the second terminal of the drive transistor and at a second node to a first voltage supply; \n a third transistor that is connected to the first node of the light-emitting device, \n a fourth transistor that is connected between a third terminal of the drive transistor and a data voltage supply; \n a fifth transistor that is connected between the third terminal of the drive transistor and a second voltage supply; and \n a capacitor having a first plate that is connected to the gate of the drive transistor and a second plate that is connectable to a reference voltage supply; \n during the initialization phase, reducing memory effects from previous frames by performing the steps of:\n placing the fourth transistor in the off state, and placing the fifth transistor in the off state to disconnect the second voltage supply from the pixel circuit; \n placing the third transistor in the on state to apply a first initialization voltage to the first node of the light-emitting device; \n setting the reference voltage to a first voltage; \n placing the second transistor in an on state, wherein the drive transistor becomes diode-connected through the second transistor such that the first initialization voltage is applied to the gate of the drive transistor and the first plate of the capacitor; and \n placing the third transistor in the off state at an end of the initialization phase; \n during the compensation phase, at least partially compensating a threshold voltage of the drive transistor by the steps of:\n placing the fourth transistor in an on state and applying a reference data voltage through the fourth transistor to the third terminal of the drive transistor, wherein the reference data voltage is set such that a voltage across the light-emitting device is below a threshold voltage of the light emitting device; \n during the programming phase applying a data voltage corresponding to a current greyscale value by the steps of:\n setting the reference voltage to a second voltage for programming the full data range; and \n changing the data voltage supply from the reference data voltage to a current data voltage corresponding to a required current through the light-emitting device during the emission phase; \n placing the fourth transistor in an off state after applying the current data voltage; and \n placing the second transistor in an off state such that the drive transistor is no longer diode-connected, wherein the current data voltage is stored by the storage capacitor; \n and during the emission phase, performing the steps of:\n setting the reference voltage to a third voltage to change the gate voltage of the drive transistor to the operational voltage range, in which the drive transistor controls the amount of current to the light-emitting device; \n placing the fifth transistor in the on state to connect the second power supply to the drive transistor; and \n controlling an amount of current to the light-emitting device depending upon a voltage at the gate of a drive transistor.

Metadata:
- Claim Count in Document: 7.0
- Percentile: 90.0
- Lexical Diversity: 3.33333
- Patent Class: 345.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['15935123', '15933474', '15756973', '15362998', '15158515']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6722215167060845
- 35 USC 102 Novelty (BERT): 0.5316452495342814
- Combined Prediction Score: 0.6581638899889043
- Mean Citation Score: 294.5416919999999
- Max Citation Score: 370.99472
- Similarity Product: 356.69786393699644

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test