Display device and electronic apparatus

• US 20090201233A1
• Filed: 03/24/2008
• Published: 08/13/2009
• Est. Priority Date: 03/26/2007
• Status: Active Grant

• Current Assignee: JDI Design and Development GK
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Uchino, Katsuhide, Yamashita, Junichi
• Granted Patent: US 8,139,004 B2
• Time in Patent Office: Days
• US Class Current: 345/80
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2300/0866 by means of changes in the pixel supply voltage
• CPC Class Codes: G09G 2310/0256 with the purpose of reversing the voltage across a light emitting or modulating element within a pixel
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• 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

Abstract

A display device includes a drive section and a pixel array section including power lines, scanning lines, signal lines, and pixels in a matrix. Each pixel includes a sampling transistor, a drive transistor, a light-emitting element, and a storage capacitor. The drive section includes a write scanner supplying a control signal to one scanning line at a time, and a signal selector supplying a drive signal to each signal line. The sampling transistor applies the drive signal to the drive transistor. The drive transistor supplies a drive current based on the drive signal to the light-emitting element. The write scanner includes output buffers, each outputting a control signal including two pulses to a corresponding scanning line. Each output buffer includes first and second output sections, the first section outputting one pulse and the second section extracting a pulse from a pulse power supply and outputting the extracted pulse.

Claims

1. A display device comprising:

a pixel array section; and

a drive section,

wherein the pixel array section includes power lines, scanning lines arranged in rows, signal lines arranged in columns, and pixels that are arranged in a matrix and that are disposed at intersections of the scanning lines and the signal lines,

wherein each of the pixels at least includes a sampling transistor, a drive transistor, a light-emitting element, and a storage capacitor,

wherein the sampling transistor has a control end connected to a corresponding one of the scanning lines and a pair of current ends connected between a corresponding one of the signal lines and a control end of the drive transistor,

wherein the drive transistor has a pair of current ends, one current end being connected to the light-emitting element and the other current end being connected to a corresponding one of the power lines,

wherein the storage capacitor is connected between the control end of the drive transistor and the one current end of the drive transistor,

wherein the drive section includes a write scanner configured to sequentially supply a control signal to one of the scanning lines at a time in each horizontal scanning period, and a signal selector configured to supply a drive signal to each of the signal lines, the drive signal being switched between a signal potential and a reference potential in each horizontal scanning period,

wherein the sampling transistor applies the drive signal to the control end of the drive transistor in accordance with the control signal,

wherein the drive transistor supplies a drive current to the light-emitting element in accordance with the drive signal,

wherein the write scanner includes output buffers, each of the output buffers being configured to output a control signal to a corresponding one of the scanning lines, the control signal including a first pulse and a second pulse in each horizontal scanning period, and

wherein each of the output buffers includes a first output section connected to a fixed power supply and a second output section connected to a pulse power supply, the first output section outputting the first pulse, and the second output section extracting a pulse supplied from the pulse power supply and outputting the extracted pulse as the second pulse.

2. The display device according to claim 1, wherein the sampling transistor samples the reference potential of the drive signal in accordance with the first pulse output from the first output section, thereby causing the pixel to perform a threshold-voltage correcting operation for correcting a variation in a threshold voltage of the drive transistor, and

wherein the sampling transistor samples the signal potential of the drive signal in accordance with the second pulse output from the second output section, thereby causing the pixel to write the signal potential in the storage capacitor and simultaneously to perform a mobility correcting operation for correcting a variation in mobility of the drive transistor.

3. The display device according to claim 2, wherein each of the output buffers in the write scanner sequentially outputs the first pulse and the second pulse in each horizontal scanning period so that the first pulse and the second pulse do not overlap each other with respect to time.

4. The display device according to claim 3, wherein each of the output buffers in the write scanner first outputs the first pulse and, after a period of time, outputs the second pulse in each horizontal scanning period.

5. The display device according to claim 2, wherein the drive section includes a power scanner configured to switch each of the power lines between a high potential and a low potential, and

wherein, when each of the pixels performs the threshold-voltage correcting operation, the power scanner first switches a corresponding one of the power lines to the low potential and then to the high potential.

6. An electronic apparatus comprising the display device as set forth in claim 1.