TRANSFLECTIVE LIQUID CRYSTAL DISPLAY
First Claim
1. A display comprising:
- a plurality of pixel circuits each comprisinga first electrode;
a second electrode;
a reflective region to reflect ambient light, the reflective region comprising a first portion of a liquid crystal layer between the first and second electrodes, and a polarization dependent reflector that transmits light having a first polarization and reflects light having a second polarization;
a transmissive region to transmit backlight, the transmissive region comprising a second portion of the liquid crystal layer between the first and second electrodes;
a dielectric layer between the first and second electrodes in one of the reflective region and the transmissive region, the dielectric layer configured such that when a pixel voltage is applied to the first and second electrodes, the percentage of the pixel voltage applied across the first portion of the liquid crystal layer is different from the percentage of the pixel voltage applied across the second portion of the liquid crystal layer; and
a backlight module to generate the backlight.
4 Assignments
0 Petitions
Accused Products
Abstract
A display includes a plurality of pixel circuits, each pixel circuit including a first electrode, a second electrode, a reflective region, and a transmissive region. The reflective region reflects ambient light and includes a first portion of a liquid crystal layer and a polarization dependent reflector. The transmissive region transmits backlight and includes a second portion of the liquid crystal layer. A dielectric layer is between the first and second electrodes in one of the reflective region and the transmissive region, the dielectric layer configured such that when a pixel voltage is applied to the first and second electrodes, the percentage of the pixel voltage applied across the first portion of the liquid crystal layer is different from the percentage of the pixel voltage applied across the second portion of the liquid crystal layer. The display includes a backlight module to generate the backlight.
18 Citations
31 Claims
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1. A display comprising:
a plurality of pixel circuits each comprising a first electrode; a second electrode; a reflective region to reflect ambient light, the reflective region comprising a first portion of a liquid crystal layer between the first and second electrodes, and a polarization dependent reflector that transmits light having a first polarization and reflects light having a second polarization; a transmissive region to transmit backlight, the transmissive region comprising a second portion of the liquid crystal layer between the first and second electrodes; a dielectric layer between the first and second electrodes in one of the reflective region and the transmissive region, the dielectric layer configured such that when a pixel voltage is applied to the first and second electrodes, the percentage of the pixel voltage applied across the first portion of the liquid crystal layer is different from the percentage of the pixel voltage applied across the second portion of the liquid crystal layer; and a backlight module to generate the backlight. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A display comprising;
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a first substrate; a second substrate; pixel circuits between the first and second substrates, each pixel circuit having a transmissive portion and a reflective portion, each pixel circuit comprising a first electrode, a second electrode, a liquid crystal cell, a polarization dependent reflector located at the reflective portion, and a shield capacitor located at one of the reflective and transmissive portions and positioned in series with the liquid crystal cell. - View Dependent Claims (17, 18, 19)
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20. A transflective display comprising:
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a first linear polarizer having a first transmission axis; a second linear polarizer having a second transmission axis, the first linear polarizer located closer to a front side of the display than the second linear polarizer; pixel circuits each comprising; a liquid crystal layer between the first and second linear polarizers, the liquid crystal layer having a first portion and a second portion, the first portion corresponding to a reflective portion of the pixel circuit, the second portion corresponding to a transmissive portion of the pixel circuit; a storage capacitor to store an electric charge corresponding to a pixel voltage; a polarization dependent reflector that is associated with the first portion of the liquid crystal layer, the polarization dependent reflector to reflect a first component of external light and transmit a second component of the external light, the first component having a first polarization substantially perpendicular to the first transmission axis and the second component having a second polarization substantially parallel to the first transmission axis; and means for applying a first percentage of the pixel voltage to the first portion of the liquid crystal layer and a second percentage of the pixel voltage to the second portion of the liquid crystal layer, the first percentage being different from the second percentage. - View Dependent Claims (21)
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22. A method comprising:
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reflecting external light having a first polarization after the external light passes a liquid crystal layer in a reflective region of a pixel of a display, the reflected light being directed toward a viewer of the display; transmitting external light having a second polarization after the external light passes the liquid crystal layer in the reflective region, the transmitted light being directed away from the viewer; transmitting backlight through the liquid crystal layer in a transmissive region of the pixel, the transmitted light being directed toward the viewer; applying a first percentage of a pixel voltage to the liquid crystal layer in the reflective region; and applying a second percentage of the pixel voltage to the liquid crystal layer in the transmissive region, the second percentage being different from the first percentage. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A method comprising:
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forming a polarization dependent reflector in a first region of first substrate, the first region corresponding to a reflective region of a pixel of a display; forming a first electrode on the first substrate; forming a second electrode on a second substrate; forming a dielectric layer on a portion of the first electrode or a portion of the second electrode, the dielectric layer corresponding to either the reflective region of the pixel or a transmissive region of the pixel; and providing a liquid crystal layer between the first and second substrates, the dielectric layer being positioned in series with the liquid crystal layer between the first and second electrodes. - View Dependent Claims (29, 30, 31)
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Specification