Controlling polarization for liquid crystal displays

A reflective functional part integrated transflective display comprising:

• a liquid crystal display module defining vertical and horizontal axes and having a module front surface, said liquid crystal display module comprising a liquid crystal cell comprising at least a linear polarizer having a first linear polarization axis determining LCD output polzarization, and a light module;
• a first retarder layer forward said liquid crystal display module, said first retarder layer having a front surface, a rear surface, a retardance of about (2n+1)λ/4, and a first slow axis, which forms an angle θ1 to said first linear polarization axis, where n is an integer and λ is a wavelength and is between about 400 nm to 700 nm;
• a reflective functional part forward said first retarder layer, said reflective functional part having a rear surface and comprising at least one of a touch panel, an EMI shield, an infrared filter, and an LCD heater;
• a second retarder layer forward said reflective functional part, said second retarder layer having a second slow axis and a retardance of about (2m+1)λ/4, where m is an integer and λ is a wavelength and is between about 400 nm to 700 nm;
• a second linear polarizer forward said second retarder layer, said second linear polarizer having a second polarization axis, which forms an angle θ2 to said second slow axis of said second retarder layer;
• and
• a display front surface through which light from the light module exits,
• wherein said second linear polarization axis of said second linear polarizer is set at angle of +/−45 or +/−135 degree with respect to said first linear polarization axis.

A reflective functional part integrated display comprising:

• a liquid crystal display module having a module front surface and comprising, a liquid crystal cell, a light module, a first linear polarizer between said liquid crystal cell and said light module, said first linear polarizer having a rear surface, and a third linear polarizer forward said liquid crystal cell, said third linear polarizer having a front surface;
• a first retarder layer forward said liquid crystal display module, said first retarder layer having a front surface, a retardance of about (2n+1)λ/4, and a first slow axis, where n is an integer and λ is a wavelength and is between about 400 nm to 700 nm;
• a reflective functional part forward said first retarder layer, said reflective functional part having a rear surface and comprising at least one of a touch panel, an EMI shield, an infrared filter and an LCD heater;
• a second retarder layer forward of said reflective functional part, said second retarder layer having a second slow axis and a retardance of about (2m+1)λ/4, where m is an integer and λ is a wavelength and is between about 400 nm to 700 nm;
• a second linear polarizer forward said second retarder layer, said second linear polarizer having a second polarization axis, which forms an angle θ2 to said second slow axis of said second retarder layer;
• and
• a display front surface through which light exits,
• wherein at least one of said first retarder layer front surface and said reflective functional part rear surface includes at least one of an anti-reflection treatment and a diffusing structure, said anti-reflection treatment comprising a multi-layer AR coating or a laminated sheet member with AR coating.

A reflective functional part integrated display comprising:

• a liquid crystal display module defining vertical and horizontal axes and having a module front surface, said liquid crystal display module comprises, from front to rear, a liquid crystal cell comprising a liquid crystal layer sandwiched between two transparent electrodes, a first linear polarizer having a first linear polarization axis, and a backlight module;
• a first retarder layer forward said liquid crystal display module, said first retarder layer having a front surface, a rear surface, a retardance of about (2n+1)λ/4, and a first slow axis, which forms an angle θ1 to said first linear polarization axis, where n is an integer and λ is a wavelength and is between about 400 nm to 700 nm;
• a reflective functional part forward said first retarder layer, said reflective functional part having a rear surface and comprising at least one of a touch panel, an EMI shield, an infrared filter, and an LCD heater;
• a second retarder layer forward said reflective functional part, said second retarder layer having a second slow axis and a retardance of about (2m+1)λ/4, where m is an integer and λ is a wavelength and is between about 400 nm to 700 nm;
• a second linear polarizer forward said second retarder layer, said second linear polarizer having a second linear polarization axis, which forms an angle θ2 to said second slow axis of said second retarder layer;
• and
• a display front surface through which light from said backlight module exits,
• wherein θ2 is between about −25° to about −65° and said second linear polarization axis is set at about 90 degree with respect to said first linear polarization axis, and
• wherein θ1 is between about +25° to about +65° when (m+n) is zero or an even integer, or θ1 is between about −25° to about −65° when (m+n) is an odd integer.