Liquid crystal display apparatus and method of manufacturing the same

• US 20050195353A1
• Filed: 03/08/2005
• Published: 09/08/2005
• Est. Priority Date: 03/08/2004
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cha, Sung-Eun, Uh, Kee-Han, Kim, Sang-Woo, Kim, Jae-Hyun, Lee, Jae-Young, Park, Won-Sang, Lim, Jae-Ik
• Application Number:
  US11/075,293
• Publication Number:
  US 20050195353A1
• Time in Patent Office: Days
• US Class Current: 349/139
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy

Abstract

A LCD apparatus and a method of manufacturing the same. The LCD apparatus includes a lower plate having a pixel region and a switching element disposed in the pixel region, a pixel electrode formed in the pixel region of the lower plate and electrically coupled to an electrode of the switching element, the pixel electrode having a plurality of pixel electrode portions and at least one connecting portion that electrically connects the pixel electrode portions to each other, an upper plate having a display region corresponding to the pixel region, a common electrode formed on the upper plate and having a plurality of opening patterns that corresponds to the pixel electrode portions, respectively, a liquid crystal layer formed between the pixel electrode and the common electrode. Therefore, a viewing angle is increased to improve an image display quality.

Claims

1. A liquid crystal display apparatus comprising:

a lower plate including a pixel region and a switching element disposed in the pixel region;

a pixel electrode formed in the pixel region of the lower plate and electrically coupled to an electrode of the switching element, the pixel electrode including a plurality of pixel electrode portions and at least one connecting portion that electrically connects the pixel electrode portions to each other;

an upper plate including a display region corresponding to the pixel region;

a common electrode disposed on the upper plate, the common electrode including a plurality of opening patterns that correspond to the pixel electrode portions, respectively; and

a liquid crystal layer interposed between the pixel electrode and the common electrode.

2. The liquid crystal display apparatus of claim 1, wherein the opening patterns of the common electrode correspond to central portions of the pixel electrode portions, respectively.

3. The liquid crystal display apparatus of claim 1, wherein each of the pixel electrode portions has a polygonal shape or a circular shape.

4. The liquid crystal display apparatus of claim 1, wherein each of the pixel electrode portions has a square shape.

5. The liquid crystal display apparatus of claim 1, wherein each of the pixel electrode portions has a square shape having rounded corners.

6. The liquid crystal display apparatus of claim 1, wherein the pixel electrode comprises:

a first pixel electrode portion having a transparent conductive material;

a second pixel electrode portion having the transparent conductive material;

a third pixel electrode portion having a conductive material of high reflectivity;

a first connecting portion electrically connecting the first pixel electrode portion to the second pixel electrode portion; and

a second connecting portion electrically connecting the second pixel electrode portion to the third pixel electrode portion.

7. The liquid crystal display apparatus of claim 1, further comprising an organic layer disposed on the lower plate having the pixel electrode portions, the pixel electrode portions having a transparent conductive material.

8. The liquid crystal display apparatus of claim 1, further comprising an organic layer disposed between the lower plate and the pixel electrode portions, the pixel electrode portions having a transparent conductive material,

and wherein the organic layer has a contact hole through which the electrode of the switching element makes electrical contact with the pixel electrode.

9. The liquid crystal display apparatus of claim 1, further comprising:

a first protecting layer disposed on the common electrode, the first protecting layer having a smooth surface and a uniform thickness; and

a second protecting layer disposed on the pixel electrode, the second protecting layer having a smooth surface and a uniform thickness,

and wherein the liquid crystal layer is interposed between the first and second protecting layers.

10. The liquid crystal display apparatus of claim 1, wherein each of the opening patterns of the common electrode comprises a plurality of first recesses to form a plurality of domains in the liquid crystal layer.

11. The liquid crystal display apparatus of claim 10, further comprising a storage capacitor electrically coupled to the pixel electrode,

and wherein a portion of the storage capacitor is formed between the pixel electrode portions adjacent to each other.

12. The liquid crystal display apparatus of claim 10, wherein each of the opening patterns comprises four first recesses.

13. The liquid crystal display apparatus of claim 10, further comprising a plurality of protrusions formed on the pixel electrode portions, respectively,

and wherein each of the protrusions corresponds to each of the opening patterns.

14. The liquid crystal display apparatus of claim 13, wherein each of the protrusions comprises a plurality of second recesses to form the domains in the liquid crystal layer.

15. The liquid crystal display apparatus of claim 10, wherein each of the pixel electrode portions comprises a quadrangular shape having rounded corners.

16. The liquid crystal display apparatus of claim 10, wherein each of the pixel electrode portions comprises a circular shape.

17. The liquid crystal display apparatus of claim 10, further comprising:

a first protecting layer disposed on the common electrode, the first protecting layer having a smooth surface and a uniform thickness;

a second protecting layer disposed on the pixel electrode, the second protecting layer having a smooth surface and a uniform thickness; and

a plurality of protrusions disposed between the pixel electrode portions and the second protecting layer corresponding to the opening patterns, respectively,

and wherein the liquid crystal layer is interposed between the first and second protecting layers.

18. The liquid crystal display apparatus of claim 17, wherein each of the protrusions comprises a plurality of second recesses to form the domains in the liquid crystal layer.

19. The liquid crystal display apparatus of claim 10, further comprising:

a first protecting layer disposed on the common electrode, the first protecting layer having a smooth surface and a uniform thickness;

a second protecting layer disposed on the pixel electrode, the second protecting layer having a smooth surface and a uniform thickness; and

a plurality of protrusions disposed on the second protecting layer corresponding to the opening patterns, respectively,

wherein the liquid crystal layer is interposed between the first and second protecting layers.

20. The liquid crystal display apparatus of claim 19, wherein each of the protrusions comprises a plurality of second recesses to form the domains in the liquid crystal layer.

21. A liquid crystal display apparatus comprising:

a lower plate including a pixel region and a switching element disposed in the pixel region, the pixel region including a transmission window and a reflection region;

a pixel electrode electrically coupled to an electrode of the switching element, the pixel electrode including;

a transparent electrode in the transmission window of the lower plate, the transparent electrode having a transparent conductive material;

a reflecting electrode in the reflection region of the lower plate, the reflecting electrode having a conductive material having high reflectivity; and

a connecting portion electrically connecting the transparent electrode to the reflecting electrode;

an upper plate including a display region corresponding to the pixel region;

a common electrode disposed on the upper plate, the common electrode including a plurality of opening patterns that corresponds to the transparent electrode and the reflecting electrode, respectively; and

a liquid crystal layer interposed between the pixel electrode and the common electrode.

22. The liquid crystal display apparatus of claim 21, wherein a portion of the liquid crystal layer corresponding to the reflection region has thinner thickness than thickness of a portion of the liquid crystal layer corresponding to the transmission window.

23. The liquid crystal display apparatus of claim 21, wherein the transparent electrode comprises a plurality of transparent electrode portions and at least one connecting portion electrically connecting the transparent electrode portions to each other.

24. The liquid crystal display apparatus of claim 23, wherein each of the transparent electrode portions has a square shape having rounded corners.

25. A liquid crystal display apparatus comprising:

a lower plate including a pixel region and a switching element disposed in the pixel region;

a pixel electrode formed in the pixel region of the lower plate and electrically coupled to an electrode of the switching element;

a storage capacitor disposed on the lower plate, a portion of the storage capacitor protruded toward a central line of the pixel region;

an upper plate including a display region corresponding to the pixel region;

a common electrode disposed on the upper plate, the common electrode corresponding to the pixel electrode; and

a liquid crystal layer interposed between the pixel electrode and the common electrode.

26. The liquid crystal display apparatus of claim 25, wherein the pixel electrode comprises a plurality of pixel electrode portions and at least one connecting portion electrically connecting the pixel electrode portions to each other.

27. The liquid crystal display apparatus of claim 25, wherein the common electrode comprises a plurality of opening patterns, and each of the opening patterns includes a plurality of first recesses.

28. The liquid crystal display apparatus of claim 25, wherein a remaining portion of the storage capacitor is formed along sides of the pixel region.

29. A method of manufacturing a liquid crystal display apparatus comprising:

forming a switching element in a pixel region of a lower plate;

forming a pixel electrode including a plurality of pixel electrode portions and at least one connecting portion electrically connecting the pixel electrode portions to each other in the pixel region of the lower plate, the pixel electrode being electrically coupled to an electrode of the switching element;

depositing a first transparent conductive material on an upper plate including a display region corresponding to the pixel region;

removing a portion of the first transparent conductive material corresponding to central portions of the pixel electrode portions to form a plurality of opening patterns; and

forming a liquid crystal layer between the pixel electrode and the first transparent conductive material including the opening patterns.

30. The method of claim 29, wherein removing a portion of the first transparent conductive material corresponding to central portions of the pixel electrode portions to form a plurality of opening patterns comprises:

coating a photoresist film on the first transparent conductive material;

exposing the coated photoresist film using a mask;

developing the exposed photoresist film to form a photoresist pattern; and

etching the first transparent conductive material using the photoresist pattern as an etching mask.

31. The method of claim 29, further comprising an insulating layer on the lower plate including the switching element, and wherein the insulating layer has a contact hole through which the electrode of the switching element is partially exposed.

32. The method of claim 31, wherein forming a pixel electrode comprises:

depositing a second transparent conductive material on the insulating layer and in the contact hole;

partially etching the second transparent conductive material to form a first pixel electrode portion, a second pixel electrode portion adjacent to the first pixel electrode portion, a first connecting portion electrically connecting the first pixel electrode portion to the second pixel electrode portion, and a second connecting portion electrically connecting the second pixel electrode portion to the electrode of the switching element through the contact hole;

depositing a conductive material having high reflectivity on the insulating layer having the first and second pixel electrode portions and the first and second connecting portions; and

partially etching the deposited conductive material having the high reflectivity to form a third pixel electrode portion that is electrically coupled to the second connecting portion.

33. The method of claim 29, wherein forming a pixel electrode comprises:

forming a first pixel electrode portion of the pixel electrode in the pixel region, the first pixel electrode portion having a second transparent conductive material; and

forming an organic layer on the lower plate having the first pixel electrode portion.

34. The method of claim 29, wherein forming a pixel electrode comprises:

forming an organic layer on the lower plate, the organic layer having a contact hole through which the electrode of the switching element is partially exposed; and

forming a first pixel electrode portion of a pixel electrode on a portion of the organic layer corresponding to the pixel region, the first pixel electrode portion having a second transparent conductive material.

35. The method of claim 29, further comprising:

coating a polyimide (PI) resin on the upper plate having the deposited conductive material to form a first protecting layer; and

coating the polyimide (PI) resin on the lower plate having the pixel electrode to form a second protecting layer.

36. A method of manufacturing a liquid crystal display apparatus comprising:

forming a switching element on a lower plate including a pixel region, the pixel region including a transmission window and a reflection region;

forming an insulating layer on the lower plate including the switching element, the insulating layer including a contact hole through which an electrode of the switching element is partially exposed;

depositing a first transparent conductive material on the insulating layer;

partially etching the first transparent conductive material to form a transparent electrode including a plurality of transparent electrode portions, a first connecting portion electrically connecting the transparent electrode portions to each other, and a second connecting portion electrically connecting one of the transparent electrode portions to the electrode of the switching element;

depositing a conductive material having high reflectivity on the lower plate including the transparent electrode;

partially etching the deposited conductive material to form a reflecting electrode that is electrically coupled to the transparent electrode;

depositing a second transparent conductive material on an upper plate including a display region corresponding to the pixel region;

removing a portion of the second transparent conductive material corresponding to central portions of the transparent electrode portions to form opening patterns; and

forming a liquid crystal layer between the transparent electrode and the second transparent conductive material and between the reflecting electrode and the second transparent conductive material.

37. A method of manufacturing a liquid crystal display apparatus comprising:

forming a semiconductor circuit on a lower plate including a pixel region;

forming a pixel electrode electrically coupled to a first electrode of a switching element of the semiconductor circuit in the pixel region of the lower plate, the pixel electrode including a plurality of pixel electrode portions and at least one connecting portion electrically connecting the pixel electrode portions to each other;

depositing a transparent conductive material on an upper plate including a display region corresponding to the pixel region;

removing a portion of the deposited transparent conductive material corresponding to central portions of the pixel electrode portions to form a plurality of opening patterns, each of the opening patterns including a plurality of first recesses; and

forming a liquid crystal layer between the pixel electrode and the deposited transparent conductive material.

38. The method of claim 37, wherein forming a semiconductor circuit comprises:

forming a gate electrode of the switching element and a first storage electrode spaced apart from the gate electrode on the lower plate, a portion of the first storage electrode protruded toward a central line of the pixel region;

forming a gate insulating layer on the lower plate having the gate electrode and the first storage electrode;

forming a semiconductor layer on a portion of the gate insulating layer corresponding to the gate electrode;

forming a conductive layer on the gate insulating layer having the semiconductor layer; and

partially removing the conductive layer to form the first electrode on the semiconductor layer, a second electrode spaced apart from the first electrode, and a second storage electrode formed on a portion of the gate insulating layer corresponding to the first storage electrode.

39. The method of claim 37, further comprising:

coating a polyimide (PI) resin on the upper plate having the deposited transparent conductive material to form a first protecting layer; and

coating a polyimide (PI) resin on the lower plate having the pixel electrode to form a second protecting layer.