Display device and electronic equipment

• US 20080218466A1
• Filed: 11/05/2007
• Published: 09/11/2008
• Est. Priority Date: 11/20/2006
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Ito, Daisuke, Nakajima, Yoshiharu, Kida, Yoshitoshi, Koyama, Hirotoshi
• Granted Patent: US 8,018,415 B2
• Time in Patent Office: Days
• US Class Current: 345/96
• CPC Class Codes: G09G 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 3/3677 suitable for active matrices only

Abstract

A display device includes a display unit in which pixels are arranged in a matrix state and a drive circuit selecting respective pixels in the display unit by each row and giving additional potential to pixel electrodes of the pixels by using coupling, in which the drive circuit has a function of allowing the reverse polarity of potential added to pixel electrodes to be a potential which can add suitable voltage to additional potential lines in a frame before adding the additional potential.

Claims

1. A display device, comprising:

a display unit in which pixels are arranged in a matrix state; and

a drive circuit selecting respective pixels in the display unit by each row and giving additional potential to pixel electrodes of the pixels by using coupling, and

wherein the drive circuit has a function of allowing the reverse polarity of potential added to pixel electrodes to be a potential which can add suitable voltage to additional potential lines in a frame before adding the additional potential.

2. The display device according to claim 1, further comprising:

scanning lines, auxiliary lines as additional potential line and signal lines arranged according to a matrix arrangement of pixels, and

wherein each pixel includes

a pixel cell,

a switching element connecting the signal line to the pixel electrode of the pixel cell selectively according to the level of the scanning line, and

a storage capacitor in which one electrode is connected to the pixel electrode and the other electrode is connected to the corresponding auxiliary line, and

wherein the drive circuit applies a certain pulse to the scanning lines and the auxiliary lines at the predetermined timing.

3. The display device according to claim 2,

wherein the drive circuit includes

a scanner unit having a function of generating a first pulse and a second pulse,

a latch unit having a latch latching a polarity pulse at the second-pulse timing and an inversion transfer unit inverting the level of the polarity pulse at the first-pulse timing and inputting the pulse to the latch.

4. The display device according to claim 3,

wherein the drive circuit includes

a scanner unit having a function of generating a first pulse and a second pulse, and

a latch unit having a first latch latching a polarity pulse at the first-pulse timing, a second latch latching the latch signal of the first latch at the second-pulse timing and an inversion transfer unit inverting the level of the latch signal of the first latch at the first-pulse timing and inputting the signal to the second latch.

5. The display device according to claim 3,

wherein the scanner unit has a function of performing scanning operation again when being reset at the time of switching display.

6. The display device according to claim 5,

wherein the latch unit charges the auxiliary line to a certain target potential when being reset.

7. Electronic equipment, comprising

a display device and

wherein the display device includes

a display unit in which pixels are arranged in a matrix state, and

a drive circuit selecting respective pixels in the display unit by each row and giving additional potential to pixel electrodes of the pixels by using coupling, and

wherein the drive circuit has a function of allowing the reverse polarity of potential added to pixel electrodes to be a potential which can add suitable voltage to additional potential lines in a frame before adding the additional potential.

8. The electronic equipment according to claim 7, further comprising:

scanning lines, auxiliary lines as additional potential line and signal lines arranged according to a matrix arrangement of pixels, and

wherein each pixel includes

a pixel cell,

a switching element connecting the signal line to the pixel electrode of the pixel cell selectively according to the level of the scanning line, and

a storage capacitor in which one electrode is connected to the pixel electrode and the other electrode is connected to the corresponding auxiliary line, and

wherein the drive circuit applies a certain pulse to the scanning lines and the auxiliary lines at the predetermined timing.

9. The electronic equipment according to claim 8,

wherein the drive circuit includes

a scanner unit having a function of generating a first pulse and a second pulse,

a latch unit having a latch latching a polarity pulse at the second-pulse timing and an inversion transfer unit inverting the level of the polarity pulse at the first-pulse timing and inputting the pulse to the latch.

10. The electronic equipment according to claim 9,

wherein the drive circuit includes

a scanner unit having a function of generating a first pulse and a second pulse, and

a latch unit having a first latch latching a polarity pulse at the first-pulse timing, a second latch latching the latch signal of the first latch at the second-pulse timing and an inversion transfer unit inverting the level of the latch signal of the first latch at the first-pulse timing and inputting the signal to the second latch.

11. The electronic equipment according to claim 9,

wherein the scanner unit has a function of performing scanning operation again when being reset at the time of switching display.

12. The electronic equipment according to claim 11,

wherein the latch unit charges the auxiliary line to a certain target potential when being reset.