Transflective color liquid crystal display with internal rear polarizer
View Patent ↗A transflective color liquid crystal display ( 200 ) with internal rear polarizer ( 275 ) has a front polarizer ( 260 ), a front substrate ( 210 ), a first color filter layer ( 212 ), a front transparent electrode ( 240 ), a liquid crystal layer ( 250 ), a rear transparent electrode ( 230 ), a rear polarizer ( 275 ), a reflector ( 235 ), and a rear substrate ( 220 ). The inclusion of an internal rear polarizer ( 275 ) results in little optical path difference between a reflective mode and a transmissive mode of the transflective color LCD ( 200 ). The internal rear polarizer ( 275 ) also results in little parallax, because the internal reflector ( 235 ) is very close to an image-forming layer ( 250 ). Additionally, a second color filter layer ( 214 ) can be added behind the internal reflector ( 235 ) to enhance the brightness and color saturation of the transflective color LCD ( 200 ) with internal rear polarizer ( 275 ) during the transmissive mode.
1. A transflective color liquid crystal display comprising:
a front polarizer;
a front substrate disposed behind the front polarizer;
a front transparent electrode disposed behind the front substrate;
a liquid crystal layer disposed behind the front transparent electrode;
a rear transparent electrode disposed behind the liquid crystal layer;
a rear polarizer disposed behind the rear transparent electrode;
a reflector disposed behind the rear polarizer;
a first color filter layer disposed behind the front substrate and in front of the reflector;
a rear substrate disposed behind the reflector; and
a second color filter layer disposed behind the reflector.
2. A transflective color liquid crystal display according to claim 1 , wherein the second color filter layer has a photoluminescent color filter.
3. A transflective color liquid crystal display according to claim 2 , further comprising:
a backlight sub-system disposed behind the rear substrate.
4. A transflective color liquid crystal display according to claim 3 wherein the backlight sub-system is a monochromatic backlight sub-system.
5. A transflective color liquid crystal display according to claim 4 wherein the monochromatic backlight sub-system produces ultraviolet wavelengths.
6. A transflective color liquid crystal display according to claim 4 wherein the monochromatic backlight sub-system produces blue wavelengths.
7. A transflective color liquid crystal display according to claim 1 further comprising:
a backlight sub-system disposed behind the rear substrate.
8. A portable electronic device with a transflective color liquid crystal display comprising:
a front polarizer;
a front substrate;
a rear substrate;
an image forming layer disposed between the front substrate and the rear substrate;
a polarizer disposed between the image forming layer and the rear substrate;
a reflector disposed between the polarizer and the rear substrate;
a first color filter layer disposed in front of the reflector; and
a second color filter layer disposed behind the reflector.
9. A portable electronic device with a transflective color liquid crystal display according to claim 8 wherein the second color filter layer comprises photoluminescent material.
10. A portable electronic device with a transflective color liquid crystal display according to claim 9 further comprising:
a backlight sub-system disposed behind the rear substrate.
11. A portable electronic device with a transflective color liquid crystal display according to claim 10 wherein the backlight sub-system is a monochromatic backlight sub-system.
12. A portable electronic device with a transflective color liquid crystal display according to claim 11 wherein the monochromatic backlight sub-system produces ultraviolet wavelengths.
13. A portable electronic device with a transflective color liquid crystal display according to claim 11 wherein the monochromatic backlight sub-system produces blue wavelengths.
14. A portable electronic device with a transflective color liquid crystal display according to claim 8 further comprising:
a backlight sub-system disposed behind the rear substrate.