IP Library Granted Patent US 7,030,947
Granted Patent B2
US 7,030,947 · App. 10/667,460 · Granted Apr 18, 2006

Reflective liquid crystal display device

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Quick Facts
Patent No.
US 7,030,947
App. No.
10/667,460
Granted
Apr 18, 2006
Kind
B2
Abstract

A reflective liquid crystal display device includes first and second substrates spaced apart and facing each other, a gate line and a data line on an inner surface of the first substrate and crossing each other to define a pixel area, a thin film transistor electrically connected to the gate and data lines, a passivation layer covering the thin film transistor, a blocking layer on the passivation layer and corresponding to the thin film transistor, a pixel electrode on the passivation layer and connected to the thin film transistor, a retardation film on an outer surface of the first substrate, a polarizer on the retardation film, an absorption layer on an inner surface of the second substrate, a cholesteric liquid crystal color filter layer on the absorption layer, a common electrode on the cholesteric liquid crystal color filter layer, and a liquid crystal layer between the common electrode and the pixel electrode, wherein the data line overlaps adjacent pixel electrodes and a overlapping width is over 50% of a width of the data line.

Claims (112)

1. A reflective liquid crystal display device, comprising:

first and second substrates spaced apart and facing each other;

a gate line and a data line on an inner surface of the first substrate and crossing each other to define a pixel area;

a thin film transistor corresponding to each pixel area electrically connected to the gate and data lines;

a passivation layer covering the thin film transistor;

a blocking layer on the passivation layer and corresponding to the thin film transistor;

a pixel electrode corresponding to each pixel area on the passivation layer and connected to the thin film transistor;

a retardation film on an outer surface of the first substrate;

a polarizer on the retardation film;

a color filter layer on the second substrate;

a common electrode on the color filter layer; and

a liquid crystal layer between the common electrode and the pixel electrode,

wherein the blocking layer is made of a metal material, wherein the data line overlaps an adjacent portion of the pixel electrode by an overlapping width between about 50% and about 100% of a width of the data line.

2. A reflective liquid crystal display device, comprising:

first and second substrates spaced apart and facing each other;

a gate line and a data line on an inner surface of the first substrate and crossing each other to define a pixel area;

a thin film transistor corresponding to each pixel area electrically connected to the gate and data lines;

a passivation layer covering the thin film transistor;

a blocking layer on the passivation layer and corresponding to the thin film transistor;

a pixel electrode corresponding to each pixel area on the passivation layer and connected to the thin film transistor;

a retardation film on an outer surface of the first substrate;

a polarizer on the retardation film;

a color filter layer on the second substrate;

a common electrode on the color filter layer; and

a liquid crystal layer between the common electrode and the pixel electrode,

wherein the blocking layer is made of a metal material, wherein a portion of the width of the data not overlapped by the pixel electrode is less than about 50%.

3. A reflective liquid crystal display device, comprising:

first and second substrates spaced apart and facing each other;

a gate line and a data line on an inner surface of the first substrate and crossing each other to define a pixel area;

a thin film transistor corresponding to each pixel area electrically connected to the gate and data lines;

a passivation layer covering the thin film transistor;

a blocking layer on the passivation layer and corresponding to the thin film transistor;

a pixel electrode corresponding to each pixel area on the passivation layer and connected to the thin film transistor;

a retardation film on an outer surface of the first substrate;

a polarizer on the retardation film;

an absorption layer on an inner surface of the second substrate;

a color filter layer on the second substrate, wherein the color filter layer is a cholesteric liquid crystal color filter layer;

a common electrode on the color filter layer;

a liquid crystal layer between the common electrode and the pixel electrode,

wherein the blocking layer is made of a metal material.

4. A reflective liquid crystal display device, comprising:

first and second substrates spaced apart and facing each other;

a gate line and a data line on an inner surface of the first substrate and crossing each other to define a pixel area;

a thin film transistor corresponding to each pixel area electrically connected to the gate and data lines;

a passivation layer covering the thin film transistor;

a blocking layer on the passivation layer and corresponding to the thin film transistor;

a pixel electrode corresponding to each pixel area on the passivation layer and connected to the thin film transistor;

a retardation film on an outer surface of the first substrate;

a polarizer on the retardation film;

a reflective layer on an inner surface of the second substrate;

a color filter layer on the second substrate, wherein the color filter layer is a absorption type color filter layer;

a common electrode on the color filter layer; and

a liquid crystal layer between the common electrode and the pixel electrode,

wherein the blocking layer is made of a metal material.

5. The device according to claim 4 , wherein the blocking layer includes chromium.

6. The device according to claim 4 , wherein at least a portion of the blocking layer is disposed between the passivation layer and the pixel electrode.

7. A reflective liquid crystal display device, comprising;

first and second substrates spaced apart and facing each other;

a gate line and a data line on an inner surface of the first substrate and crossing each other to define a pixel area;

a thin film transistor corresponding to each pixel area electrically connected to the gate and data lines;

a passivation layer covering the thin film transistor;

a blocking layer on the passivation layer and corresponding to the thin film transistor;

a pixel electrode corresponding to each pixel area on the passivation layer and connected to the thin film transistor;

a retardation film on an outer surface of the first substrate;

a polarizer on the retardation film;

a color filter layer on the second substrate;

a common electrode on the color filter layer; and

a liquid crystal layer between the common electrode and the pixel electrode,

wherein the blocking layer is made of a metal material, wherein the blocking layer is disposed on the pixel electrode.

8. The device according to claim 4 , wherein the passivation layer includes one of benzocyclobutene and acrylic resin.

9. A reflective liquid crystal display device, comprising:

first and second substrates spaced apart and facing each other;

a gate line and a data line on an inner surface of the first substrate and crossing each other to define a pixel area;

a thin film transistor electrically connected to the gate and data lines;

a passivation layer covering the thin film transistor;

a blocking layer on the passivation layer and corresponding to the thin film transistor;

first and second black matrices on the passivation layer and overlapping respective sides of the data line;

a pixel electrode on the passivation layer, the pixel electrode connected to the thin film transistor and overlapping the first and second black matrices;

a retardation film on an outer surface of the first substrate;

a polarizer on the retardation film;

a color filter layer on the second substrate;

a common electrode on the color filter layer; and

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

10. The device according to claim 9 , further comprising an absorption layer on an inner surface of the second substrate, wherein the color filter layer is a cholesteric liquid crystal color filter layer.

11. The device according to claim 9 , further comprising an reflective layer on an inner surface of the second substrate, wherein the color filter layer is a absorption type color filter layer.

12. The device according to claim 9 , wherein the pixel electrode overlaps adjacent data lines.

13. The device according to claim 9 , wherein the first and second black matrices are made of the same material as the blocking layer.

14. The device according to claim 9 , wherein the blocking layer is made of a metal material.

15. The device according to claim 14 , wherein the blocking layer includes chromium.

16. The device according to claim 9 , wherein the blocking layer is disposed between the passivation layer and the pixel electrode.

17. The device according to claim 9 , wherein the blocking layer is disposed on the pixel electrode.

18. A reflective liquid crystal display device, comprising: first and second substrates spaced apart and facing each other;

first and second black matrices on an inner surface of the first substrate;

a plurality of gate lines on the inner surface of the first substrate;

a plurality of data lines crossing the gate lines to define pixel areas and overlapping the first and second black matrices;

a thin film transistor electrically connected to the gate and data lines;

a passivation layer covering the thin film transistor;

a blocking layer on the passivation layer and corresponding to the thin film transistor;

a pixel electrode on the passivation layer, the pixel electrode connected to the thin film transistor and overlapping the first and second black matrices;

a retardation film on an outer surface of the first substrate;

a polarizer on the retardation film;

a color filter layer on the second substrate;

a common electrode on the color filter layer; and

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

19. The device according to claim 18 , further comprising an absorption layer on an inner surface of the second substrate, wherein the color filter layer is a cholesteric liquid crystal color filter layer.

20. The device according to claim 18 , further comprising an reflective layer on an inner surface of the second substrate, wherein the color filter layer is a absorption type color filter layer.

21. The device according to claim 18 , wherein the pixel electrode overlaps adjacent data lines.

22. The device according to claim 18 , wherein the first and second black matrices are made of the same material as the gate lines.

23. The device according to claim 18 , further comprising an overcoat layer between the first and second black matrices and the gate lines.

24. The device according to claim 18 , wherein the blocking layer is made of a metal material.

25. The device according to claim 18 , wherein the blocking layer is disposed between the passivation layer and the pixel electrode.

26. The device according to claim 18 , wherein the blocking layer is disposed on the pixel electrode.

Assignments (2)
CHANGE OF NAME Recorded Oct 17, 2008
From: LG.PHILIPS LCD CO., LTD.
To: LG DISPLAY CO., LTD.
Reel/Frame 021763/0177 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 23, 2003
From: MOON, JONG-WEON; KIM, MUN-CHUL
To: LG.PHILIPS LCD CO., LTD.
Reel/Frame 014541/0984 →