Upper substrate, liquid crystal display apparatus having the same and method of manufacturing the same

• US 20040218123A1
• Filed: 04/28/2004
• Published: 11/04/2004
• Est. Priority Date: 04/30/2003
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cha, Sung-Eun, Uh, Kee-Han, Kim, Sang-Woo, Kim, Jae-Hyun, Jang, Yong-Kyu, Lee, Jae-Young, Park, Won-Sang, Park, Sang-Woo
• Granted Patent: US 7,379,134 B2
• Time in Patent Office: Days
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133357 Planarisation layers
• CPC Class Codes: G02F 1/133555 Transflectors

Abstract

In a liquid crystal display apparatus, a lower substrate has a transmissive electrode formed in a transmissive area of a first substrate and a reflective electrode formed in a reflective area of the first substrate. An upper substrate has a second substrate, a first insulating layer formed on the second substrate corresponding to the transmissive area, a common electrode formed on the first insulating layer and the second substrate corresponding to the reflective area, and a second insulating layer formed on the common electrode corresponding to the reflective area. Accordingly, the liquid crystal display apparatus may have a uniform cell gap, thereby improving a reflectance and a transmittance thereof.

Claims

1. An upper substrate comprising:

a substrate having a first area and a second area adjacent to the first area;

a first insulating layer disposed on the first area of the substrate;

a transparent electrode disposed on the first insulating layer and the second area of the substrate; and

a second insulating layer disposed on the transparent electrode corresponding to the second area.

2. The upper substrate of claim 1, further comprising a color filter layer disposed between the substrate and the first insulating layer at the first area, and disposed between the substrate and the transmissive electrode at the second area.

3. The upper substrate of claim 2, wherein the color filter layer has at least one hole though which the second area of the substrate is exposed.

4. The upper substrate of claim 3, further comprising a planarization layer formed on the color filter layer so as to reduce a step-difference between the color filter layer and the substrate exposed through the hole.

5. A liquid crystal display apparatus comprising:

a lower substrate having a transmissive electrode formed in a transmissive area of a first substrate and a reflective electrode formed in a reflective area of the first substrate so as to define the transmissive area and the reflective area of the first substrate;

an upper substrate having a second substrate, a first insulating layer formed on the second substrate corresponding to the transmissive area, a common electrode formed on the first insulating layer and the second substrate corresponding to the reflective area, and a second insulating layer formed on the common electrode corresponding to the reflective area; and

a liquid crystal layer disposed between the lower substrate and the upper substrate.

6. The liquid crystal display apparatus of claim 5, wherein the reflective electrode is formed on the transmissive electrode, and the reflective electrode has a transmission window through which the transmissive electrode is partially exposed.

7. The liquid crystal display apparatus of claim 6, wherein the lower substrate further comprises an organic insulating layer disposed between the first substrate and the transmissive electrode, and the organic insulating layer has at least one concavo-convex portion formed on an upper surface thereof.

8. The liquid crystal display apparatus of claim 5, wherein the second insulating layer has a dielectric constant different from a dielectric constant of the liquid crystal layer.

9. A liquid crystal display apparatus comprising:

a lower substrate having a transmissive electrode and a reflective electrode having a transmission window through which the transmissive electrode is exposed so as to define a transmissive area and a reflective area;

an upper substrate combined with the lower substrate, the upper substrate having a color filter layer and a common electrode uniformly formed on the color filter layer in thickness, the color filter layer having a first thickness at a position corresponding to the reflective area and a second thickness that is thicker than the first thickness at a position corresponding to the transmissive area; and

a liquid crystal layer disposed between the lower substrate and the upper substrate; and

an insulating layer disposed between the lower substrate and the upper substrate corresponding to the reflective area.

10. The liquid crystal display apparatus of claim 9, wherein the insulating layer comprises an inorganic insulating layer or an organic insulating layer.

11. The liquid crystal display apparatus of claim 9, wherein the insulating layer has a dielectric constant different from a dielectric constant of the liquid crystal layer.

12. The liquid crystal display apparatus of claim 9, wherein the insulating layer is disposed on the common electrode.

13. The liquid crystal display apparatus of claim 12, wherein the insulating thin layer has a thickness subtracting the first thickness from the second thickness.

14. The liquid crystal display apparatus of claim 9, wherein the insulating layer is disposed on the reflective electrode.

15. The liquid crystal display apparatus of claim 9, wherein the lower substrate further comprises:

a thin film transistor; and

an organic insulating layer formed on the thin film transistor and having a contact hole so as to expose a drain electrode of the thin film transistor,

wherein the transmissive electrode and the reflective electrode are electrically connected to the drain electrode via the contact hole.

16. A method of manufacturing an upper substrate, the method comprising;

forming a first insulating layer on a first area of a substrate having the first area and a second area adjacent to the first area;

forming a transmissive electrode on the first insulating layer and the second area of the substrate; and

forming a second insulating layer on the transmissive electrode corresponding to the second area.

17. The method of claim 16, wherein each of the first and second insulating layers comprises a positive type photoresist or a negative type photoresist.

18. The method of claim 17, wherein the first insulating layer comprises a photoresist different from a photoresist of the second insulating layer.

19. The method of claim 16, prior to forming the first insulating layer, further comprising:

forming a color filter layer on the substrate;

partially removing the color filter layer to form at least one hole formed in the second area such that the substrate is exposed through the hole; and

forming a planarization layer so as to reduce a step-difference between the color filter layer and the substrate exposed through the hole.

20. A method of manufacturing a liquid crystal display apparatus, the method comprising:

forming an upper substrate including;

forming a color filter layer on a first substrate having a first area and a second area adjacent to the first area, the color filter layer having a different thickness in the first and second area, and

forming a common electrode on the color filter layer,

forming a lower substrate including;

forming a transmissive electrode on a second substrate, and

forming a reflective electrode on the transmissive electrode corresponding to the first area,

forming a insulating thin layer between the upper substrate and the lower substrate corresponding to the first area; and

interposing a liquid crystal layer between the upper substrate and the lower substrate.

21. The method of claim 20, wherein the color filter layer has a first thickness at a position corresponding to the first area and a second thickness that is thicker than the first thickness at a position corresponding to the second area.