Dual mode liquid crystal display device with capacitor electrodes separate from pixel electrode performing and functioning as a reflection electrode

• US 7,443,456 B2
• Filed: 11/14/2005
• Issued: 10/28/2008
• Est. Priority Date: 11/12/2004
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Innolux Display Corporation (InnoLux Corporation)
• Inventors: Lai, Chien-Ting
• Primary Examiner(s): Nelms; David C.
• Assistant Examiner(s): HEYMAN, JOHN S
• Application Number:
  US11/273,384
• Publication Number:
  US 20060103771A1
• Time in Patent Office: 1,079 Days
• Field of Search: 349/38, 349/39, 349/114
• US Class Current: 349/38
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode

Abstract

An LCD device (100) includes a first substrate (110), a second substrate (120), and a liquid crystal layer (130) having liquid crystal molecules interposed between the first and second substrates. A pixel electrode (112) is disposed at an inner surface of the first substrate, and a common electrode (122) is disposed at an inner surface of the second substrate. A storage capacitor (140) has an upper storage electrode (118) and a lower storage electrode (113) disposed at an inner surface of the first substrate, with the upper storage electrode electrically connecting with the pixel electrode. The upper storage electrode functions as a reflection electrode. This structure ensures the LCD device is capable of providing a display both in a reflection mode and a transmission mode.

Claims

1. A liquid crystal display device, comprising:

a first substrate and a second substrate;

a liquid crystal layer having liquid crystal molecules interposed between the first and second substrates;

a pixel electrode disposed at an inner surface of the first substrate;

a common electrode disposed at an inner surface of the second substrate; and

a storage capacitor having an upper storage capacitor electrode and a lower storage capacitor electrode disposed at the inner surface of the first substrate, the upper storage capacitor electrode separate from and electrically connecting with the pixel electrode;

wherein the upper storage capacitor electrode performs and functions as a reflection electrode.

2. The liquid crystal display device as claimed in claim 1, wherein the upper storage capacitor electrode is made of a material selected from the group consisting of Al, Ag, AlNd, and AlY.

3. The liquid crystal display device as claimed in claim 1, wherein the upper storage capacitor electrode comprises a transparent electrode and a reflector, and the reflector covers the transparent electrode.

4. The liquid crystal display device as claimed in claim 3, wherein the reflector is made of a material selected from the group consisting of Al, Ag, AlNd, AlY, and resin.

5. The liquid crystal display device as claimed in claim 1, wherein a surface of the upper storage capacitor electrode has a plurality of bumps.

6. The liquid crystal display device as claimed in claim 1, further comprising a diffuser disposed on a surface of the second substrate.

7. A liquid crystal display device, comprising:

a first substrate and a second substrate;

a liquid crystal layer having liquid crystal molecules interposed between the first and second substrates;

a pixel electrode disposed at an inner surface of the first substrate;

a common electrode disposed at an inner surface of the second substrate; and

a lower storage capacitor electrode disposed at the inner surface of the first substrate and cooperating with the pixel electrode to form storage capacitors;

wherein the lower storage capacitor electrode performs and functions as a reflection electrode.

8. The liquid crystal display device as claimed in claim 7, wherein the lower storage capacitor electrode is made of a material selected from the group consisting of Al, Ag, AlNd, and AlY.

9. The liquid crystal display device as claimed in claim 8, wherein a surface of the lower storage capacitor electrode has a plurality of bumps.

10. The liquid crystal display device as claimed in claim 7, further comprising a diffuser disposed on a surface of the second substrates.

11. A liquid crystal display device, comprising:

a first substrate and a second substrate;

a liquid crystal layer having liquid crystal molecules interposed between the first and second substrates;

a pixel electrode disposed at an inner surface of the first substrate;

a common electrode disposed at an inner surface of the second substrate; and

a storage capacitor disposed at the inner surface of the first substrate, the storage capacitor including an upper storage capacitor electrode and a lower storage capacitor electrode, the upper storage capacitor electrode being electrically connected with the pixel electrode;

wherein the upper storage capacitor electrode is a transparent electrode, and the lower storage capacitor electrode performs and functions as a reflection electrode.

12. The liquid crystal display device as claimed in claim 11, wherein the lower storage capacitor electrode is made of a material selected from the group consisting of Al, Ag, AlNd, and AlY.

13. The liquid crystal display device as claimed in claim 12, wherein a surface of the lower storage capacitor electrode has a plurality of bumps.

14. The liquid crystal display device as claimed in claim 11, further comprising a diffuser disposed on a surface of the second substrate.