Reflective liquid crystal display device using a reflective plate having light weight

• US 6,473,145 B1
• Filed: 09/06/2000
• Issued: 10/29/2002
• Est. Priority Date: 09/09/1999
• Status: Expired due to Term

• Current Assignee: BOE HYDIS Technology Company Limited (SK Hynix Inc.)
• Original Assignee: Hyundai Display Technology, Inc. (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Shim, Hwan Soo, Lee, Jae Jin, Seo, Dong Hae, Choi, Sang Un
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Ngo, Julie
• Application Number:
  US09/656,371
• Time in Patent Office: 783 Days
• Field of Search: 349/113, 349/44, 349/106, 349/110, 349/139
• US Class Current: 349/113
• CPC Class Codes: G02F 1/133305 Flexible substrates, e.g. plastics, organic film
• CPC Class Codes: G02F 1/133334 Electromagnetic shields
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Abstract

The present invention discloses a reflective plate having lightweight functioning as a substrate and a reflective LCD using the same. The reflective LCD according to the present invention comprises: a transparent insulating substrate; a gate bus line and a data bus line formed at an inner side of the substrate and defining a pixel region; a pixel electrode formed in the pixel region; a switching device operating the pixel electrode by receiving the signals of the gate bus line and the data bus line; a black matrix formed on the surface of the substrate 1s and covering a portion at which the gate bus line, the data bus line, and the switching device are formed; color filters respectively formed at the outsides of the black matrix; and a plastic reflective plate opposing to the inner side of the substrate, wherein the plastic reflective plate comprises: a plastic plate; a photoresist layer disposed on the plastic plate and having an uneven portion on the surface thereof; a reflective film having a high reflectance coated on the photoresist layer having the uneven portion; a planarization layer formed on the photoresist layer so as to planarize the surface of the photoresist layer; a transparent electrode disposed over the planarization layer; and an alignment layer formed over the transparent electrode.

Claims

1. A reflective plate having light weight, comprising:

a plastic plate;

a photoresist layer disposed on the plastic plate and having an uneven portion in the surface thereof;

a reflective film having a high reflectance coated on the photoresist layer having the uneven portion;

a planarization layer formed on the photoresist layer so as to planarize the surface of the photoresist layer;

an alignment layer disposed over the planarization layer; and

a transparent electrode formed at the back side of the plastic substrate.

2. The reflective plate according to claim 1, wherein the photoresist layer is a polycarbonate layer.

3. The reflective plate according to claim 1, wherein the reflective film having a high reflectance is an aluminum layer.

4. A reflective liquid crystal display device using a reflective plate having light weight, comprising:

a transparent insulating substrate;

a gate bus line and a data bus line formed at an inner side of the substrate and defining a pixel region;

a pixel electrode formed in the pixel region;

a switching device operating the pixel electrode by receiving the signals of the gate bus line and the data bus line;

a black matrix formed on the surface of the substrate and covering a portion at which the gate bus line, the data bus line, and the switching device are formed;

color filters respectively formed between the black matrixes; and

a plastic reflective plate opposing to the inner side of the substrate, wherein the plastic reflective plate comprises;

a plastic plate;

a photoresist layer disposed on the plastic plate and having an uneven portion on the surface thereof;

a reflective film having a high reflectance coated on the photoresist layer having the uneven portion;

a planarization layer formed on the photoresist layer so as to planarize the surface of the photoresist layer;

an alignment layer disposed over the planazation layer; and

a transparent electrode formed at the back side of the plastic plate.

5. The reflective plate according to claim 4, wherein the photoresist layer is a polycarbonate layer.

6. The reflective plate according to claim 4, wherein the reflective film having a high reflectance is an aluminum layer.

7. A reflective liquid crystal display device using a reflective plate having light weight, comprising:

a transparent insulating substrate;

a gate bus line and a data bus line formed at an inner side of the substrate and defining a pixel region;

a pixel electrode formed in the pixel region;

a switching device operating the pixel electrode by receiving the signals of the gate bus line and the data bus line;

a black matrix formed on the surface of the insulating substrate and covering a portion at which the gate bus line, the data bus line, and the switching device are formed;

color filters respectively formed between the black matrixes; and

a plastic reflective plate opposing to the inner side of the insulating substrate,

wherein the plastic reflective plate comprises;

a plastic plate;

a photoresist layer disposed on the plastic plate and having an uneven portion on the surface thereof;

a reflective film having a high reflectance coated on the photoresist layer having the uneven portion;

a planarization layer formed on the photoresist layer so as to planarize the surface of the photoresist layer;

an alignment layer disposed over the planarization layer; and

a transparent electrode discharging static electricity at the back side of the plastic plate.

8. The reflective plate according to claim 7, wherein the photoresist layer is a polycarbonate layer.

9. The reflective plate according to claim 7, the reflective film having a high reflectance is an aluminum layer.