Reflective-transmission type thin film transistor liquid crystal display

• US 20040207785A1
• Filed: 01/22/2004
• Published: 10/21/2004
• Est. Priority Date: 11/11/1999
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Myeon-Koo Kang, Yong-Kyu Jang, Young-Kuil Joo
• Inventors: Joo, Young-Kuil, Jang, Yong-Kyu, Kang, Myeon-Koo
• Granted Patent: US 7,068,335 B2
• Time in Patent Office: Days
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer

Abstract

The present invention provide a reflective transmission type TFT LCD wherein each of the reflective pixel electrode and the transmissive pixel electrode is connected directly to a source electrode of a thin film transistor, or the transmissive pixel electrode are concurrently formed with gate electrode and made with double layer of transparent conduction layer and metal layer which can be used as parameter conduction layer between the transparent conduction layer and the reflective pixel electrode. According to one aspect of the present invention, the reflective transmission type thin film transistor liquid crystal display (TFT LCD) comprises a glass substrate, at least one thin film transistor on the substrate for controlling a pixel, passivation layer having at least one contact hole in a source region of the thin film transistor, a transmissive pixel electrode which is formed on the passivation layer and is connected with a source electrode of the source region through a contact hole, a reflective pixel electrode which is formed on the passivation layer and is connected with the source electrode of the source region through a contact hole. And the pixel area is composed of a transparent area in which only the transmissive pixel electrode of whole pixel electrode exist and a reflective area in which the reflective pixel electrode exist.

Claims

1-16. -16. (canceled)

17. A reflective-transmissive type liquid crystal display (LCD), comprising:

a capacitor line formed on a substrate;

an insulating layer formed on the capacitor line and having a contact hole exposing the capacitor line;

a capacitor electrode formed on the insulating layer and electrically connected to the capacitor line through the contact hole;

a passivation layer covering the capacitor electrode;

a transparent pixel electrode formed on the passivation layer; and

a reflective pixel electrode formed on the passivation layer.

18. The reflective-transmissive type LCD of claim 17, further comprising a gate electrode formed on the substrate.

19. The reflective-transmissive type LCD of claim 18, wherein the gate electrode and the capacitor line are formed of the same material.