Transflective displays with reflective polarizing transflector
First Claim
1. A reflective display, comprisinga light modulator provided to selectively alter a polarization state of polarized light passing through the light modulator, the light modulator having a viewer side and a back side;
- a reflective polarizer positioned on the back side of the light modulator to reflect light having a first polarization state and to transmit light having a second polarization state; and
a rear dichroic polarizer positioned between the light modulator and the reflective polarizer to allow at least a portion of light reflected by the reflective polarizer to be transmitted back through the light modulator, further including a front dichroic polarizer positioned on the viewer side of the light modulator.
0 Assignments
0 Petitions
Accused Products
Abstract
A transflector is described which increases efficiency and brightness under both ambient and supplemental lighting conditions in visual display applications. In one embodiment, the transflector includes a reflective polarizing element that reflects one polarization of light and transmits the other. In an alternate embodiment, the transflector includes a reflective polarizing element and a diffusing element such that the transflector diffusely reflects light of one polarization and transmits the other. The transflector is useful for both reflective and transflective liquid crystal displays.
312 Citations
14 Claims
-
1. A reflective display, comprising
a light modulator provided to selectively alter a polarization state of polarized light passing through the light modulator, the light modulator having a viewer side and a back side; -
a reflective polarizer positioned on the back side of the light modulator to reflect light having a first polarization state and to transmit light having a second polarization state; and
a rear dichroic polarizer positioned between the light modulator and the reflective polarizer to allow at least a portion of light reflected by the reflective polarizer to be transmitted back through the light modulator, further including a front dichroic polarizer positioned on the viewer side of the light modulator.
-
-
2. A reflective display, comprising
a light modulator provided to selectively alter a polarization state of polarized light passing through the light modulator, the light modulator having a viewer side and a back side; -
a reflective polarizer positioned on the back side of the light modulator to reflect light having a first polarization state and to transmit light having a second polarization state; and
a rear dichroic polarizer positioned between the light modulator and the reflective polarizer to allow at least a portion of light reflected by the reflective polarizer to be transmitted back through the light modulator, wherein a high reflectivity axis of the reflective polarizer forms an angle of about 0°
with a transmission axis of the rear dichroic polarizer.
-
-
3. A reflective display, comprising
a light modulator provided to selectively alter a polarization state of polarized light passing through the light modulator, the light modulator having a viewer side and a back side; -
a reflective polarizer positioned on the back side of the light modulator to reflect light having a first polarization state and to transmit light having a second polarization state; and
a rear dichroic polarizer positioned between the light modulator and the reflective polarizer to allow at least a portion of light reflected by the reflective polarizer to be transmitted back through the light modulator, further comprising a diffusing element disposed between the reflective polarizer and the rear dichroic polarizer, wherein the diffusing element includes elliptical diffusers.
-
-
4. A transflective display, comprising:
-
a transmissive light modulator having a viewer side and a back side, the light modulator provided to selectively alter a polarization state of polarized light passing through the light modulator;
a supplemental light source disposed on the back side of the light modulator;
a reflective polarizer positioned between the light modulator and the supplemental light source, the reflective polarizer disposed to reflect light having a first polarization state and to transmit light having a second polarization state; and
an absorber disposed between the supplemental light source and the reflective polarizer to absorb a portion of light passing through the absorber and to transmit a portion of light passing through the absorber, wherein an image is generated by the light modulator when either ambient light is incident on the viewer side of the light modulator or under supplemental lighting conditions when light is generated by the supplemental light source. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
Specification