Display device

• US 8,279,382 B2
• Filed: 03/28/2007
• Issued: 10/02/2012
• Est. Priority Date: 08/02/2006
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Nishida, Kenji
• Primary Examiner(s): NGUYEN, THANH NHAN P
• Application Number:
  US12/375,246
• Publication Number:
  US 20090262287A1
• Time in Patent Office: 2,015 Days
• Field of Search: None
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 2203/09 transflective

Abstract

The present invention provides a display device which can provide bright display by both of reflective display and transmissive display without having a multi-gap structure and which can reduce a difference in response time between the reflective region and the transmissive region. The display device of the present invention is a display device including: a pair of substrates; a display medium interposed between the pair of substrates; and a pixel having a reflective region for performing reflective display and a transmissive region for performing transmissive display, wherein the display device includes a pixel electrode and a common electrode on one of the pair of substrates, a voltage is applied to the display medium through the pixel electrode and the common electrode, the pixel electrode is provided with a plurality of slits, the plurality of slits include a pair of line-symmetric slits, and a slit arranged between the pair of line-symmetric slits, of inner contours facing each other of the pair of line-symmetric slits, one forms an angle with the other, and an axis of symmetry of the pair of line-symmetric slits is positioned in the reflective region.

Claims

1. A display device comprising:

a pair of substrates;

a display medium interposed between the pair of substrates; and

a pixel having a reflective region for performing reflective display and a transmissive region for performing transmissive display,

wherein the display device includes a pixel electrode and a common electrode on one of the pair of substrates,

a voltage is applied to the display medium through the pixel electrode and the common electrode,

the pixel electrode is provided with a plurality of slits,

the plurality of slits include a pair of line-symmetric slits, and a slit arranged between the pair of line-symmetric slits,

of inner contours facing each other of the pair of line-symmetric slits, one forms an angle with the other, and

an axis of symmetry of the pair of line-symmetric slits is positioned in the reflective region, wherein the axis of symmetry is positioned within the slit arranged between the pair of line-symmetric slits.

2. The display device according to claim 1,

wherein the pixel electrode has a comb-tooth shape.

3. The display device according to claim 1,

wherein the plurality of slits of the pixel electrode are entirely surrounded by the pixel electrode.

4. The display device according to claim 1,

wherein the plurality of slits of the pixel electrode have a rectangular shape having at least one bent part.

5. The display device according to claim 1,

wherein the plurality of slits of the pixel electrode have a zig-zag shape.

6. The display device according to claim 1,

wherein the plurality of slits of the pixel electrode have a circular arc shape.

7. The display device according to claim 1,

wherein the plurality of slits of the pixel electrode have a meandering shape.

8. The display device according to claim 1,

wherein the common electrode is formed in a layer different from the pixel electrode, and

an insulating film is between the pixel electrode and the common electrode.

9. The display device according to claim 1,

wherein the common electrode is provided with a slit.

10. The display device according to claim 9,

wherein the common electrode is arranged in a layer where the pixel electrode is formed.

11. The display device according to claim 9,

wherein the slit of the common electrode has substantially the same shape as a shape of the slit of the pixel electrode.

12. The display device according to claim 11,

wherein the common electrode and the pixel electrode are positioned within each other'"'"'s slit.

13. A display device comprising:

a pair of substrates;

a display medium interposed between the pair of substrates; and

a pixel having a reflective region for performing reflective display and a transmissive region for performing transmissive display,

wherein the display device includes a pixel electrode and a common electrode on one of the pair of substrates,

a voltage is applied to the display medium through the pixel electrode and the common electrode,

the pixel electrode is provided with a plurality of slits,

the plurality of slits include a pair of line-symmetric slits, and a slit arranged between the pair of line-symmetric slits,

of inner contours facing each other of the pair of line-symmetric slits, one forms an angle with the other,

an axis of symmetry of the pair of line-symmetric slits is positioned in the reflective region,

wherein the common electrode is provided with a slit, and

wherein the axis of symmetry is positioned within the slit of the common electrode.

14. A display device comprising:

a pair of substrates;

a display medium interposed between the pair of substrates; and

a pixel having a reflective region for performing reflective display and a transmissive region for performing transmissive display,

wherein the display device includes a pixel electrode and a common electrode on one of the pair of substrates,

a voltage is applied to the display medium through the pixel electrode and the common electrode,

the pixel electrode is provided with a plurality of slits,

the plurality of slits include a pair of line-symmetric slits, and a slit arranged between the pair of line-symmetric slits,

of inner contours facing each other of the pair of line-symmetric slits, one forms an angle with the other,

an axis of symmetry of the pair of line-symmetric slits is positioned in the reflective region,

wherein a shield electrode is arranged between the pixel electrode and the common electrode in the reflective region.

15. The display device according to claim 14,

wherein the shield electrode is connected to ground.

16. A display device comprising:

a pair of substrates;

a display medium interposed between the pair of substrates; and

a pixel having a reflective region for performing reflective display and a transmissive region for performing transmissive display,

wherein the display device includes a pixel electrode and a common electrode on one of the pair of substrates,

a voltage is applied to the display medium through the pixel electrode and the common electrode,

the common electrode is provided with a plurality of slits,

the plurality of slits include a pair of line-symmetric slits, and a slit arranged between the pair of line-symmetric slits,

of inner contours facing each other of the pair of line-symmetric slits, one forms an angle with the other, and

an axis of symmetry of the pair of line-symmetric slits is positioned in the reflective region, wherein the axis of symmetry is positioned within the slit arranged between the pair of line-symmetric slits.

17. The display device according to claim 16,

wherein the common electrode has a comb-tooth shape.

18. The display device according to claim 16,

wherein the plurality of slits of the common electrode are entirely surrounded by the common electrode.

19. The display device according to claim 16,

wherein the plurality of slits of the common electrode have a rectangular shape having at least one bent part.

20. The display device according to claim 16,

wherein the plurality of slits of the common electrode have a zig-zag shape.

21. The display device according to claim 16,

wherein the plurality of slits of the common electrode have a circular arc shape.

22. The display device according to claim 16,

wherein the plurality of slits of the common electrode have a meandering shape.

23. The display device according to claim 16,

wherein the common electrode is formed in a layer different from the pixel electrode, and

an insulating film is between the pixel electrode and the common electrode.

24. The display device according to claim 16,

wherein the pixel electrode is provided with a slit.

25. The display device according to claim 24,

wherein the slit of the pixel electrode has substantially the same shape as a shape of the slit of the common electrode.

26. A display device comprising:

a pair of substrates;

a display medium interposed between the pair of substrates; and

a pixel having a reflective region for performing reflective display and a transmissive region for performing transmissive display,

wherein the display device includes a pixel electrode and a common electrode on one of the pair of substrates,

a voltage is applied to the display medium through the pixel electrode and the common electrode,

the common electrode is provided with a plurality of slits, the plurality of slits include a pair of line-symmetric slits, and a slit arranged between the pair of line-symmetric slits,

of inner contours facing each other of the pair of line-symmetric slits, one forms an angle with the other,

an axis of symmetry of the pair of line-symmetric slits is positioned in the reflective region,

wherein the pixel electrode is provided with a slit, and

wherein the axis of symmetry is positioned within the slit of the pixel electrode.

27. A display device comprising:

a pair of substrates;

a display medium interposed between the pair of substrates; and

a pixel having a reflective region for performing reflective display and a transmissive region for performing transmissive display,

wherein the display device includes a pixel electrode and a common electrode on one of the pair of substrates,

a voltage is applied to the display medium through the pixel electrode and the common electrode,

the common electrode is provided with a plurality of slits, the plurality of slits include a pair of line-symmetric slits, and a slit arranged between the pair line-symmetric slits,

of inner contours facing each other of the pair of line-symmetric slits, one forms an angle with the other,

an axis of symmetry of the pair of line-symmetric slits is positioned in the reflective region, and

wherein a shield electrode is arranged between the common electrode and the pixel electrode in the reflective region.

28. The display device according to claim 27,

wherein the shield electrode is connected to ground.