Display apparatus and display drive method

• US 20110128276A1
• Filed: 10/13/2010
• Published: 06/02/2011
• Est. Priority Date: 12/01/2009
• Status: Active Grant

• Current Assignee: JDI Design and Development GK
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Uchino, Katsuhide, Toyomura, Naobumi
• Granted Patent: US 9,711,082 B2
• Time in Patent Office: Days
• US Class Current: 345/212
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Abstract

A display apparatus includes: a pixel array including pixel circuits arranged in a matrix form, in which each pixel circuit has a light-emitting device, a drive transistor applying a current corresponding to a gate-source voltage to the light-emitting device, a sampling transistor inputting a voltage supplied from a signal line to a gate of the drive transistor, and a storage capacitor connected between the gate and source of the drive transistor so as to store a threshold voltage of the drive transistor and an input video signal voltage; a signal selector that supplies a reference voltage and the video signal voltage to signal lines arranged in columns on the pixel array in horizontal periods corresponding to the number of horizontal lines in one unit when the horizontal lines of the respective pixel circuits of the pixel array are grouped as one unit; and a scanner that applies a pulse to control lines arranged in rows on the pixel array so as to control the sampling transistor of the pixel circuit.

Claims

1. A display apparatus comprising:

a pixel array including pixel circuits arranged in a matrix form, in which each pixel circuit has a light-emitting device, a drive transistor applying a current corresponding to a gate-source voltage to the light-emitting device, a sampling transistor inputting a voltage supplied from a signal line to a gate of the drive transistor when the sampling transistor is brought into a conduction state, and a storage capacitor connected between the gate and source of the drive transistor so as to store a threshold voltage of the drive transistor and an input video signal voltage;

a signal selector that supplies a reference voltage and the video signal voltage to signal lines arranged in columns on the pixel array in a plurality of horizontal periods corresponding to the number of horizontal lines in one unit when the plurality of horizontal lines of the respective pixel circuits of the pixel array are grouped as one unit; and

a scanner that applies a pulse to control lines arranged in rows on the pixel array so as to control the sampling transistor of the pixel circuit,

wherein the scanner is configured to

input the reference voltage to the respective pixel circuits so that a threshold correction operation starts simultaneously within one emission cycle period in the respective pixel circuits,

input the video signal voltage sequentially to each pixel circuit in the unit after an ending time point of the threshold correction operation, and

output a pulse that causes the ending time point of the threshold correction operation to occur at different times in each pixel circuit so that periods from the ending time points of the threshold correction operation in the respective pixel circuits to the start of the inputting of the video signal voltage are the same.

2. The display apparatus according to claim 1,

wherein the scanner causes the threshold correction operation to be performed in several rounds within one emission cycle period in each pixel circuit and outputs the pulse that causes the ending time point of only a final round of the threshold correction operation among the several rounds of the threshold correction operation to occur at different times in each pixel circuit.

3. The display apparatus according to claim 2,

wherein the scanner outputs the pulse that causes the ending time points of other rounds of the threshold correction operation other than the final round of the threshold correction operation among the several rounds of the threshold correction operation to occur simultaneously in each pixel circuit.

4. A display drive method of a display apparatus including

a pixel array including pixel circuits arranged in a matrix form, in which each pixel circuit has a light-emitting device, a drive transistor applying a current corresponding to a gate-source voltage to the light-emitting device, a sampling transistor inputting a voltage supplied from a signal line to a gate of the drive transistor when the sampling transistor is brought into a conduction state, and a storage capacitor connected between the gate and source of the drive transistor so as to store a threshold voltage of the drive transistor and an input video signal voltage

a signal selector that supplies a reference voltage and the video signal voltage to signal lines arranged in columns on the pixel array in a plurality of horizontal periods corresponding to the number of horizontal lines in one unit when the plurality of horizontal lines of the respective pixel circuits of the pixel array are grouped as one unit, and

a scanner that applies a pulse to control lines arranged in rows on the pixel array so as to control the sampling transistor of the pixel circuit,

the method comprising the step of:

allowing the scanner to

input the reference voltage to the respective pixel circuits so that a threshold correction operation starts simultaneously within one emission cycle period in the respective pixel circuits,

input the video signal voltage sequentially to each pixel circuit in the unit after an ending time point of the threshold correction operation, and

output a pulse that causes the ending time point of the threshold correction operation to occur at different times in each pixel circuit so that periods from the ending time points of the threshold correction operation in the respective pixel circuits to the start of the inputting of the video signal voltage are the same.

5. A display apparatus comprising:

a scanner; and

a pixel array that performs a threshold correction operation and a video signal write operation on pixel circuits in response to a pulse output from the scanner,

wherein the scanner is configured to

cause the threshold correction operation to start simultaneously in each pixel circuit on plural rows,

cause the video signal write operation to start sequentially in each pixel circuit on the plural rows,

output a pulse so that a period from the end of the threshold correction operation to the start of the video signal write operation is the same in each pixel circuit on the plural rows.

6. A display apparatus comprising:

a scanner;

a signal line that supplies a reference potential and a video signal potential; and

a pixel array that inputs the reference potential and the video signal potential from the signal line to pixel circuits in response to a pulse output from the scanner,

wherein the scanner is configured to

cause the reference potential to be input simultaneously in each pixel circuit on plural rows,

cause the video signal potential to be input sequentially in each pixel circuit on the plural rows,

output a pulse so that a period from the end of the inputting of the reference potential to the start of the inputting of the video signal potential is the same in each pixel circuit on the plural rows.