LCD APPARATUS

• US 20100079687A1
• Filed: 09/25/2009
• Published: 04/01/2010
• Est. Priority Date: 09/29/2008
• Status: Active Grant

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Furuta, Yoshihiro
• Granted Patent: US 8,054,418 B2
• Time in Patent Office: Days
• US Class Current: 349/5
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133533 Colour selective polarisers G02F1/1347 takes precedence
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence
• CPC Class Codes: H04N 9/3108 by using a single electronic spatial light modulator
• CPC Class Codes: H04N 9/3167 for polarizing the light beam polarizing optical systems per se G02B27/28

Abstract

An LCD apparatus includes LCD panels for modulating irradiated light based on picture signals, a projection lens for extendedly projecting the light modulated by the LCD panels, a light source for emitting light to irradiate the LCD panels, an inorganic polarizer having a relatively higher degree of polarization and disposed on a light-emission side of each of the LCD panels, and an absorptive polarizer having a lower degree of polarization than the inorganic polarizer and disposed on a light-emission side of the inorganic polarizer. The inorganic polarizer having the higher degree of polarization and the absorptive polarizer having the lower degree of polarization have respective light transmission axes coincident with each other.

Claims

1. An LCD apparatus comprising:

LCD panels for modulating irradiated light based on picture signals;

a projection lens for extendedly projecting the light modulated by the LCD panels;

a light source for emitting light to irradiate the LCD panels;

an inorganic polarizer having a relatively higher degree of polarization and disposed on a light-emission side of each of the LCD panels; and

an absorptive polarizer having a lower degree of polarization than the inorganic polarizer and disposed on a light-emission side of the inorganic polarizer;

wherein the inorganic polarizer having the higher degree of polarization and the absorptive polarizer having the lower degree of polarization have respective light transmission axes coincident with each other.

2. An LCD apparatus according to claim 1, wherein the inorganic polarizer having the higher degree of polarization comprises an absorptive polarizer.

3. An LCD apparatus according to claim 1, wherein the absorptive polarizer having the lower degree of polarization is made of an inorganic substance.

4. An LCD apparatus according to claim 1, wherein the absorptive polarizer having the lower degree of polarization is made of an organic substance.

5. An LCD apparatus according to claim 1, wherein at least one of the inorganic polarizer having the higher degree of polarization and the absorptive polarizer having the lower degree of polarization is adjustable in rotation within a plane orthogonal to an optical axis.

6. An LCD apparatus according to claim 2, wherein at least one of the inorganic polarizer having the higher degree of polarization and the absorptive polarizer having the lower degree of polarization is adjustable in rotation within a plane orthogonal to an optical axis.

7. An LCD apparatus according to claim 3, wherein at least one of the inorganic polarizer having the higher degree of polarization and the absorptive polarizer having the lower degree of polarization is adjustable in rotation within a plane orthogonal to an optical axis.

8. An LCD apparatus according to claim 4, wherein at least one of the inorganic polarizer having the higher degree of polarization and the absorptive polarizer having the lower degree of polarization is adjustable in rotation within a plane orthogonal to an optical axis.