Display device

• US 20020126248A1
• Filed: 03/06/2002
• Published: 09/12/2002
• Est. Priority Date: 03/07/2001
• Status: Active Grant

• Current Assignee: NLT Technologies, Ltd.
• Original Assignee: NEC LCD Technologies Limited (NEC Corporation)
• Inventors: Yoshida, Takamasa
• Granted Patent: US 6,801,195 B2
• Time in Patent Office: Days
• US Class Current: 349/149
• CPC Class Codes: G02F 1/133334 Electromagnetic shields
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels

Abstract

A connecting substrate 23 of a liquid crystal display device 10 is supported by a first support member 41 and a second support member 43 and a first shield plate 31 is separated from a second shield plate 34 by a predetermined distance capable of restricting unnecessary electromagnetic radiation.

Claims

1. A display device comprising:

a display unit for displaying an image on a front surface thereof;

a signal processing unit for outputting a first signal for image display by processing an externally supplied image signal;

a drive unit responsive the first signal from said signal processing unit for outputting a second signal for driving said display unit; and

a connecting unit for connecting said signal processing unit and said display unit, said connecting unit comprising a first flexible connecting portion connected to said signal processing unit, a second flexible connecting portion connected to said display unit and mounting said drive unit thereon and a connecting substrate portion for connecting said first flexible connecting portion and said second flexible connecting portion;

an electrically conductive first shield unit having an opening portion in an image display region of said display unit and electromagnetically shielding a peripheral region and a side surface region of said image display region; and

an electrically conductive second shield unit for electromagnetically shielding a whole rear surface side of said display unit and supporting said connecting substrate portion in a position between said first shield unit and said second shield unit and remote from said first shield unit and said second shield unit by predetermined distances, respectively.

2. A display device as claimed in claim 1, wherein, representing the distance between said first shield unit and said second shield unit by L and distances between a center of said connecting substrate portion in a thickness direction thereof and said first shield unit and said second shield unit by d1 and d2, respectively, d1 and d2 satisfy the following relations to L:

d1≧

0.4×

L and d2≧

0.4×

L

3. A display device as claimed in claim 1, further comprising a first support member for supporting an area between said connecting substrate portion and said first shield unit and a second support member for supporting an area between said connecting substrate portion and said second shield unit, wherein heights of said first and second support members corresponding to respective distances between said connecting substrate portion and said first and second shield units are equal to each other.

4. A display device as claimed in claim 3, wherein said first support member and said second support member are formed of electrically non-conductive material.

5. A display device as claimed in claim 4, wherein said electrically non-conductive material is silicon rubber.

6. A display device as claimed in claim 1, wherein said display unit is a liquid crystal display panel including two substrate arranged in parallel with a predetermined gap and liquid crystal material layer sandwiched between said two substrates.